2019-12-12 13:56:11 -07:00
67 changed files with 3641 additions and 138 deletions
--- a/CODE-OF-CONDUCT.md
+++ b/CODE-OF-CONDUCT.md
@ -0,0 +1,57 @@
+# The Erbosoft Project Code of Conduct
+## (Revised December 2019)
+
+For the purposes of this project, the Owner is Amy G. Bowersox/Erbosoft Metaverse Design Solutions.
+
+1. *The Owner owns this project.* Not you.  The Owner's decisions about any aspect of the project
+are *final.*
+2. This Code of Conduct contains harsh language. Tough shit. Suck it up, Buttercup.
+3. Anyone who is an *asshole* is **banned** *from this project.* **Permanently.**
+4. This project has certain objectives.  Anything outside of those objectives is *irrelevant,*
+unless and until the *Owner* changes the objectives. Not you. In particular, if you’re a Social
+Justice Warrior trying to join this project to spread your *bullshit,* you are *automatically
+declared an asshole.* And you’re *gone.*
+5. The Owner reserves the right to change this Code of Conduct as they see fit.  If, however, you try
+to force the Owner to change it in ways that are *offensive to them,* or that try to advance
+“social justice” ideals in any way, shape, or form, you’re an *asshole.* And you’re *gone.*
+6. In particular, this project explicitly *rejects* the “Open Code of Conduct” by the TODO Group,
+the “Contributor Code of Merit” by Coraline Ada Ehmke, the “Citizen Code of Conduct” by
+Stumptown Syndicate, and any similar “codes of conduct” that may be promulgated. Anyone complaining
+about this is an *asshole,* because *who the fuck are you* to tell *the Owner* how *they* should
+run *their* goddamn project? And you’re *gone.*
+7. The *one and only* criterion that will be used to determine whether a contribution to this project
+will be accepted is *the quality of the contribution and how well it solves the problem it was
+contributed to solve.* **Period.** (“Contribution” may include code, documentation, testing, or fundraising.)
+8. The *one and only* criterion that will be used to judge your worth in relation to this project is
+*the quality of your contributions (as defined above) to this project.* **Period.**
+9. The Owner hereby does not give *one milli-micro-nano-fraction of a* **fuck** what race you are,
+what gender you are or identify as, who you want to sleep with, how old you are, what your height or
+weight is, what if anything may be different about your body or brain, what language you speak,
+what country you’re from, what God you pray to, where you work, how much money you have,
+et fucking cetera. Is your contribution any *good?* That’s all that matters.
+10. If your contribution is not accepted, and you start *whining* about how it’s “actually” because you’re
+of some-or-other gender/race/religion/nationality/whatthefuckever, you are attempting to have the deck
+stacked in your favor because you’re “special.” That makes you an *asshole.* And you’re *gone.*
+11. Only those people who have contributed a sufficient quantity of good work to the project,
+*as determined in the Owner's sole discretion,* will be allowed to assume any board position,
+administrative position, or management-related role. And, any position that the Owner gives, they can
+also *take away,* for any reason. Anyone who complains about this is an *asshole.* And they’re *gone.*
+12. You will do your own work.  If you try to pass off the work of others as your own, you’re a
+fucking *plagiarist,* and also an *asshole.* And you’re *gone.*
+13. If there’s a discussion that cannot be resolved within the scope of the project,
+*take that shit somewhere else.* The Owner does not want your bullshit here.  If you continue to spread
+your bullshit here, you’re an *asshole.* And you’re *gone.*
+14. As noted above, the Owner's decisions about any aspect of the project are *final.* Anyone
+*pissing the Owner off* by getting all up in their face about said decisions is an *asshole.*
+And they’re *gone.*
+15. Any advisory boards, committees, etc., having to do with this project will answer to *the Owner.*
+The Owner reserves the right to disband any such whenever the hell they feel like it.  As always, anyone
+complaining about this is an *asshole.* And they’re *gone.*
+16. Anyone who does not approve of the objectives, direction, or attitude of this project is
+free to *get the fuck out* at any time. Bye Felicia!
+
+Acknowlegements:
+- [Why Hackers Must Eject the SJWs](http://esr.ibiblio.org/?p=6918), Eric S. Raymond
+- [OSS Code of Merit](http://voxday.blogspot.com/2016/01/code-of-merit.html), Vox Day
+- [A contribution policy for open source that works](https://medium.com/@jmaynard/a-contribution-policy-for-open-source-that-works-bfc4600c9d83#.dslxcx1fc), Jay Maynard
+- [The Code of Merit](https://github.com/rosarior/Code-of-Merit/blob/master/CODE_OF_MERIT.md), Roberto Rosario
--- a/LICENSE.md
+++ b/LICENSE.md
@ -0,0 +1,336 @@
+GNU General Public License
+==========================
+
+_Version 2, June 1991_  
+_Copyright © 1989, 1991 Free Software Foundation, Inc.,_  
+_51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA_
+
+Everyone is permitted to copy and distribute verbatim copies
+of this license document, but changing it is not allowed.
+
+### Preamble
+
+The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
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+
+To protect your rights, we need to make restrictions that forbid
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+
+For example, if you distribute copies of such a program, whether
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+you have.  You must make sure that they, too, receive or can get the
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+
+We protect your rights with two steps: **(1)** copyright the software, and
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+
+Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
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+
+Finally, any free program is threatened constantly by software
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+The precise terms and conditions for copying, distribution and
+modification follow.
+
+### TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+**0.** This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The “Program”, below,
+refers to any such program or work, and a “work based on the Program”
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+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term “modification”.)  Each licensee is addressed as “you”.
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+**1.** You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+**2.** You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+* **a)** You must cause the modified files to carry prominent notices
+stating that you changed the files and the date of any change.
+* **b)** You must cause any work that you distribute or publish, that in
+whole or in part contains or is derived from the Program or any
+part thereof, to be licensed as a whole at no charge to all third
+parties under the terms of this License.
+* **c)** If the modified program normally reads commands interactively
+when run, you must cause it, when started running for such
+interactive use in the most ordinary way, to print or display an
+announcement including an appropriate copyright notice and a
+notice that there is no warranty (or else, saying that you provide
+a warranty) and that users may redistribute the program under
+these conditions, and telling the user how to view a copy of this
+License.  (Exception: if the Program itself is interactive but
+does not normally print such an announcement, your work based on
+the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+**3.** You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+* **a)** Accompany it with the complete corresponding machine-readable
+source code, which must be distributed under the terms of Sections
+1 and 2 above on a medium customarily used for software interchange; or,
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+years, to give any third party, for a charge no more than your
+cost of physically performing source distribution, a complete
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+distributed under the terms of Sections 1 and 2 above on a medium
+customarily used for software interchange; or,
+* **c)** Accompany it with the information you received as to the offer
+to distribute corresponding source code.  (This alternative is
+allowed only for noncommercial distribution and only if you
+received the program in object code or executable form with such
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+
+The source code for a work means the preferred form of the work for
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+
+**4.** You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+**5.** You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+**6.** Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+**7.** If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+**8.** If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+**9.** The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and “any
+later version”, you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+**10.** If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+### NO WARRANTY
+
+**11.** BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+**12.** IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+END OF TERMS AND CONDITIONS
+
+### How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the “copyright” line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+    
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+    
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+    
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w` and `show c` should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w` and `show c`; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a “copyright disclaimer” for the program, if
+necessary.  Here is a sample; alter the names:
+
+    Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+    `Gnomovision' (which makes passes at compilers) written by James Hacker.
+    
+    <signature of Ty Coon>, 1 April 1989
+    Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
--- a/17
+++ b/17
@ -1,3 +1,20 @@
+# UPIWIN - Micro Pi Windowing Framework Kernel
+# Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+# ------------------------------------------------------------------------
 all:
 	make -C buildutils all
 	make -C src all
--- a/README.md
+++ b/README.md
@ -1,4 +1,15 @@
 # UPIWIN - Micro Pi Windows Kernel

-Requirements:
- Raspberry Pi 3 with PiTFT touchscreen
+This project involves the development of a framework for running self-contained applications in Python
+on a Raspberry Pi with LCD graphical output and touchscreen input.  The ultimate goal is to produce a
+framework which is flexible enough to serve any number of “appliance” needs, by using different Python
+scripts over the same native-code substrate, deployed on an inexpensive embedded platform.
+
+## Hardware requirements
+
+- Raspberry Pi 3 with PiTFT touchscreen (Adafruit product ID 2423)
+
+## Acknowledgements
+
+A good portion of this code was written during the VMware Carbon Black Hackathon 3.3, December 6-13 2019.
+Grateful acknowledgement is provided to VMware Carbon Black for the time to accomplish this coding.
--- a/buildutils/Makefile
+++ b/buildutils/Makefile
@ -1,7 +1,24 @@
-all: mksplash
+# UPIWIN - Micro Pi Windowing Framework Kernel
+# Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+# ------------------------------------------------------------------------
+all: mkgfx

-mksplash: mksplash.c
-	gcc -o mksplash -O -Wall -I/usr/include/libpng mksplash.c -lpng16 -lz
+mkgfx: mkgfx.c
+	gcc -o mkgfx -O -Wall -I/usr/include/libpng mkgfx.c -lpng16 -lz

 clean:
-	rm -f *.o mksplash
+	rm -f *.o mkgfx
--- a/buildutils/mksplash.c
+++ b/buildutils/mksplash.c
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
@ -211,14 +230,6 @@ int do_convert(const char *infilename, const char *outfilename)
    return -1;
  }

-  if ((image_width != 320) || (image_height != 240))
-  {
-    readpng_cleanup(1);
-    fclose(fpin);
-    fprintf(stderr, "%s: image is %lux%lu, should be 320x240\n", infilename, image_width, image_height);
-    return -1;
-  }
-
  if (readpng_get_bgcolor(infilename, &bg_red, &bg_green, &bg_blue))
  {
    readpng_cleanup(1);
--- a/docs/templates/license_header.c
+++ b/docs/templates/license_header.c
@ -0,0 +1,19 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
--- a/docs/templates/license_header.mk
+++ b/docs/templates/license_header.mk
@ -0,0 +1,17 @@
+# UPIWIN - Micro Pi Windowing Framework Kernel
+# Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+# ------------------------------------------------------------------------
--- a/docs/templates/license_header.py
+++ b/docs/templates/license_header.py
@ -0,0 +1,17 @@
+#  UPIWIN - Micro Pi Windowing Framework Kernel
+#  Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License along
+#  with this program; if not, write to the Free Software Foundation, Inc.,
+#  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#  ------------------------------------------------------------------------
--- a/resources/i_clear.png
+++ b/resources/i_clear.png
--- a/resources/i_fillrect.png
+++ b/resources/i_fillrect.png
--- a/resources/i_freehand.png
+++ b/resources/i_freehand.png
--- a/resources/i_line.png
+++ b/resources/i_line.png
--- a/resources/i_rect.png
+++ b/resources/i_rect.png
--- a/resources/i_undo.png
+++ b/resources/i_undo.png
--- a/resources/splash-erbosoft.png
+++ b/resources/splash-erbosoft.png
--- a/resources/splash-vmwcblk.png
+++ b/resources/splash-vmwcblk.png
--- a/scripts/demo1.py
+++ b/scripts/demo1.py
@ -0,0 +1,293 @@
+#  UPIWIN - Micro Pi Windowing Framework Kernel
+#  Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License along
+#  with this program; if not, write to the Free Software Foundation, Inc.,
+#  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#  ------------------------------------------------------------------------
+#  Demo script that implements a simple drawing program
+import upiwin
+
+# Save off some color values.
+BLACK = upiwin.rgb(0, 0, 0)
+WHITE = upiwin.rgb(255, 255, 255)
+LTGRAY = upiwin.rgb(204, 204, 204)
+RED = upiwin.rgb(255, 0, 0)
+GREEN = upiwin.rgb(0, 255, 0)
+BLUE = upiwin.rgb(0, 0, 255)
+CYAN = upiwin.rgb(0, 255, 255)
+MAGENTA = upiwin.rgb(255, 0, 255)
+YELLOW = upiwin.rgb(255, 255, 0)
+
+# Get the stock bitmaps.
+bmp_freehand = upiwin.Bitmap(stock='freehand')
+bmp_line = upiwin.Bitmap(stock='line')
+bmp_rect = upiwin.Bitmap(stock='rect')
+bmp_fillrect = upiwin.Bitmap(stock='fillrect')
+bmp_undo = upiwin.Bitmap(stock='undo')
+bmp_clear = upiwin.Bitmap(stock='clear')
+
+hdc = upiwin.DevCtxt(type='screen')
+hdc_bits = upiwin.DevCtxt(type='memory')
+
+# divide the screen into "drawing" and "command" areas
+screen_rect = hdc.get_clip_rect()
+drawing_rect = (screen_rect[0], screen_rect[1], screen_rect[2] - 60, screen_rect[3])
+command_rect = (drawing_rect[2], screen_rect[1], screen_rect[2], screen_rect[3])
+
+# further divide up the "command" area
+tool_select_rect = (command_rect[0], command_rect[1], command_rect[2], 60)
+color_select_rect = (command_rect[0], 60, command_rect[2], 120)
+undo_rect = (command_rect[0], 120, command_rect[2], 180)
+clear_rect = (command_rect[0], 180, command_rect[2], command_rect[3])
+
+def point_in_rect(rect, x, y):
+	return (x >= rect[0]) and (x < rect[2]) and (y >= rect[1]) and (y < rect[3])
+	
+# --- Backlight control ---
+
+backlight_level_list = [1023, 768, 512, 256]
+current_backlight = 0
+
+def do_backlight():
+	upiwin.set_backlight_level(backlight_level_list[current_backlight])
+	
+def select_next_backlight():
+	global current_backlight
+	current_backlight += 1
+	if current_backlight == len(backlight_level_list):
+		current_backlight = 0
+	do_backlight()
+
+# --- Color selections ---
+
+color_list = [WHITE, RED, GREEN, BLUE, CYAN, MAGENTA, YELLOW]
+current_color = 0
+
+def draw_current_color():
+	hdc.text_color = color_list[current_color]
+	hdc.rop2 = upiwin.R2_COPYPEN
+	hdc.solid_rectangle(color_select_rect[0] + 6, color_select_rect[1] + 6, color_select_rect[0] + 54, color_select_rect[1] + 54)
+	
+def select_next_color():
+	global current_color
+	current_color += 1
+	if current_color == len(color_list):
+		current_color = 0
+	draw_current_color()
+
+# --- Object drawing ---
+
+def draw_freehand(color, data):
+	hdc.text_color = color
+	hdc.rop2 = upiwin.R2_COPYPEN
+	hdc.move_to(data[0][0], data[0][1])
+	for pt in data[1:]:
+		hdc.line_to(pt[0], pt[1])
+		
+def draw_line(color, data):
+	hdc.text_color = color
+	hdc.rop2 = upiwin.R2_COPYPEN
+	hdc.move_to(data[0][0], data[0][1])
+	hdc.line_to(data[1][0], data[1][1])
+	
+def draw_rectangle(color, data):
+	hdc.text_color = color
+	hdc.rop2 = upiwin.R2_COPYPEN
+	hdc.rectangle(data[0], data[1], data[2], data[3])
+
+def draw_filled_rectangle(color, data):
+	hdc.text_color = color
+	hdc.rop2 = upiwin.R2_COPYPEN
+	hdc.solid_rectangle(data[0], data[1], data[2], data[3])
+	
+def draw_object(obj):
+	obj['draw'](obj['color'], obj['data'])
+
+# --- Master object list ---
+
+objects_drawn = []
+
+def repaint():
+	global drawing_rect, objects_drawn
+	hdc.text_color = BLACK
+	hdc.rop2 = upiwin.R2_COPYPEN
+	hdc.solid_rectangle(drawing_rect[0], drawing_rect[1], drawing_rect[2], drawing_rect[3])
+	for obj in objects_drawn:
+		draw_object(obj)
+		
+def undo_last():
+	global objects_drawn
+	if len(objects_drawn) > 0:
+		last = len(objects_drawn) - 1
+		del objects_drawn[last]
+		repaint()
+		
+def clear_all():
+	global objects_drawn
+	if len(objects_drawn) > 0:
+		objects_drawn.clear()
+		repaint()
+
+# --- Graphic feedback --
+
+origin_x = 0
+origin_y = 0
+current_x = 0
+current_y = 0
+freehand_points = []
+
+def freehand_draw(x, y, down, up):
+	global current_x, current_y, freehand_points
+	if down:
+		freehand_points = []
+	else:
+		hdc.text_color = color_list[current_color]
+		hdc.rop2 = upiwin.R2_COPYPEN
+		hdc.move_to(current_x, current_y)
+		hdc.line_to(x, y)
+	current_x = x
+	current_y = y
+	freehand_points += [(x, y)]
+
+def rubberband_rectangle(x, y, down, up):
+	global current_x, current_y
+	hdc.text_color = LTGRAY
+	hdc.rop2 = upiwin.R2_XORPEN
+	if not down:
+		hdc.rectangle(min(origin_x, current_x), min(origin_y, current_y), max(origin_x, current_x), max(origin_y, current_y))
+	current_x = x
+	current_y = y
+	if not up:
+		hdc.rectangle(min(origin_x, current_x), min(origin_y, current_y), max(origin_x, current_x), max(origin_y, current_y))
+
+def rubberband_line(x, y, down, up):
+	global current_x, current_y
+	hdc.text_color = LTGRAY
+	hdc.rop2 = upiwin.R2_XORPEN
+	if not down:
+		hdc.move_to(origin_x, origin_y)
+		hdc.line_to(current_x, current_y)
+	current_x = x
+	current_y = y
+	if not up:
+		hdc.move_to(origin_x, origin_y)
+		hdc.line_to(current_x, current_y)
+
+# --- Tool definitions ---
+
+def save_freehand():
+	return { 'draw': draw_freehand, 'color': color_list[current_color], 'data': freehand_points }
+	
+def save_line():
+	return { 'draw': draw_line, 'color': color_list[current_color], 'data': [(origin_x, origin_y), (current_x, current_y)] }
+	
+def save_rectangle():
+	return { 'draw': draw_rectangle, 'color': color_list[current_color],
+			 'data': (min(origin_x, current_x), min(origin_y, current_y), max(origin_x, current_x), max(origin_y, current_y)) }
+
+def save_filled_rectangle():
+	return { 'draw': draw_filled_rectangle, 'color': color_list[current_color],
+			 'data': (min(origin_x, current_x), min(origin_y, current_y), max(origin_x, current_x), max(origin_y, current_y)) }
+
+tool_list = [
+	{ 'icon': bmp_freehand, 'feedback': freehand_draw, 'save': save_freehand, 'dodraw': False },
+	{ 'icon': bmp_line, 'feedback': rubberband_line, 'save': save_line, 'dodraw': True },
+	{ 'icon': bmp_rect, 'feedback': rubberband_rectangle, 'save': save_rectangle, 'dodraw': True },
+	{ 'icon': bmp_fillrect, 'feedback': rubberband_rectangle, 'save': save_filled_rectangle, 'dodraw': True }
+	]
+
+current_tool = 0
+
+def draw_current_tool():
+	hdc_bits.select_object(tool_list[current_tool]['icon'])
+	hdc.bitblt(tool_select_rect[0] + 6, tool_select_rect[1] + 6, tool_select_rect[0] + 54, tool_select_rect[1] + 54, hdc_bits, 0, 0, 0)
+	
+def select_next_tool():
+	global current_tool
+	current_tool += 1
+	if current_tool == len(tool_list):
+		current_tool = 0
+	draw_current_tool()
+
+# --- Message handlers ---
+
+def on_touchdown(x, y):
+	global origin_x, origin_y
+	if point_in_rect(drawing_rect, x, y):
+		origin_x = x
+		origin_y = y
+		tool_list[current_tool]['feedback'](x, y, True, False)
+		
+def on_touchmove(x, y):
+	if point_in_rect(drawing_rect, x, y):
+		tool_list[current_tool]['feedback'](x, y, False, False)
+		
+def on_touchup(x, y):
+	global objects_drawn
+	if point_in_rect(drawing_rect, x, y):
+		tool_list[current_tool]['feedback'](x, y, False, True)
+		object = tool_list[current_tool]['save']()
+		if tool_list[current_tool]['dodraw']:
+			draw_object(object)
+		objects_drawn += [object]
+
+def on_touchclick(x, y):
+	if point_in_rect(tool_select_rect, x, y):
+		select_next_tool()
+	elif point_in_rect(color_select_rect, x, y):
+		select_next_color()
+	elif point_in_rect(undo_rect, x, y):
+		undo_last()
+	elif point_in_rect(clear_rect, x, y):
+		clear_all()
+
+def on_button_click(button):
+	if button == 1:			# Button 1 = Set backlight level
+		select_next_backlight()
+	if button == 4:			# Button 4 = Exit app
+		upiwin.post_quit_message(0)
+
+# --- Initialize and start message loop ---
+
+do_backlight()
+
+# Draw the basic layout.
+hdc.text_color = LTGRAY
+hdc.rop2 = upiwin.R2_COPYPEN
+hdc.rectangle(tool_select_rect[0], tool_select_rect[1], tool_select_rect[2], tool_select_rect[3])
+hdc.rectangle(color_select_rect[0], color_select_rect[1], color_select_rect[2], color_select_rect[3])
+hdc.rectangle(undo_rect[0], undo_rect[1], undo_rect[2], undo_rect[3])
+hdc.rectangle(clear_rect[0], clear_rect[1], clear_rect[2], clear_rect[3])
+
+draw_current_tool()
+draw_current_color()
+
+hdc_bits.select_object(bmp_undo)
+hdc.bitblt(undo_rect[0] + 6, undo_rect[1] + 6, undo_rect[0] + 54, undo_rect[1] + 54, hdc_bits, 0, 0, 0)
+hdc_bits.select_object(bmp_clear)
+hdc.bitblt(clear_rect[0] + 6, clear_rect[1] + 6, clear_rect[0] + 54, clear_rect[1] + 54, hdc_bits, 0, 0, 0)
+
+# Main message loop
+msg = {}
+while upiwin.get_message(msg):
+	if msg['message'] == upiwin.WM_TOUCHDOWN:
+		on_touchdown(msg['attrs'][0], msg['attrs'][1])
+	if msg['message'] == upiwin.WM_TOUCHMOVE:
+		on_touchmove(msg['attrs'][0], msg['attrs'][1])
+	if msg['message'] == upiwin.WM_TOUCHUP:
+		on_touchup(msg['attrs'][0], msg['attrs'][1])
+	if msg['message'] == upiwin.WM_TOUCHCLICK:
+		on_touchclick(msg['attrs'][0], msg['attrs'][1])
+	elif msg['message'] == upiwin.WM_HWBUTTONCLICK:
+		on_button_click(msg['attrs'][0])
--- a/scripts/test_clipping.py
+++ b/scripts/test_clipping.py
@ -0,0 +1,52 @@
+#  UPIWIN - Micro Pi Windowing Framework Kernel
+#  Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License along
+#  with this program; if not, write to the Free Software Foundation, Inc.,
+#  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#  ------------------------------------------------------------------------
+#  Test of line clipping
+import upiwin
+
+hdc = upiwin.DevCtxt(type='screen')
+hdc.text_color = 0xFFFFFF  # white
+hdc.rectangle(99, 99, 200, 200)
+
+clip = hdc.get_clip_rect()
+hdc.set_clip_rect(100, 100, 200, 200)
+
+hdc.text_color = 0x0000FF  # red
+hdc.move_to(50, 200)
+hdc.line_to(200, 50)
+
+hdc.text_color = 0x00FF00  # green
+hdc.move_to(250, 200)
+hdc.line_to(100, 50)
+
+hdc.text_color = 0xFF0000  # blue
+hdc.move_to(50, 100)
+hdc.line_to(200, 250)
+
+hdc.text_color = 0x00FFFF  # yellow
+hdc.move_to(250, 100)
+hdc.line_to(100, 250)
+
+hdc.set_clip_rect(clip[0], clip[1], clip[2], clip[3])
+
+msg = {}
+while upiwin.get_message(msg):
+	if msg['message'] == upiwin.WM_HWBUTTONUP:
+		bn = msg['attrs'][0]
+		if bn == 4:
+			print("Quitting the application.")
+			upiwin.post_quit_message(0)
--- a/scripts/tmp_main.py
+++ b/scripts/tmp_main.py
@ -1,25 +1,64 @@
-# Initial test script
+#  UPIWIN - Micro Pi Windowing Framework Kernel
+#  Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License along
+#  with this program; if not, write to the Free Software Foundation, Inc.,
+#  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#  ------------------------------------------------------------------------
+#  Initial test script
+import upiwin
 import upiwin_tmp

-FBPRIMCLR_BLACK = 0x0000
-FBPRIMCLR_RED = 0xF800
-FBPRIMCLR_GREEN = 0x07E0
-FBPRIMCLR_BLUE = 0x001F
-FBPRIMCLR_YELLOW = 0xFFE0
-FBPRIMCLR_CYAN = 0x07FF
-FBPRIMCLR_MAGENTA = 0xF81F
-FBPRIMCLR_WHITE = 0xFFFF
+def log_touch(event, x, y):
+	print("Touch {0} at ({1}, {2})".format(event, x, y))

-upiwin_tmp.filled_rectangle(10, 10, 50, 50, FBPRIMCLR_RED, False)
-upiwin_tmp.filled_rectangle(60, 10, 100, 50, FBPRIMCLR_GREEN, False)
-upiwin_tmp.filled_rectangle(110, 10, 150, 50, FBPRIMCLR_BLUE, False)
-upiwin_tmp.filled_rectangle(10, 60, 50, 100, FBPRIMCLR_CYAN, False)
-upiwin_tmp.filled_rectangle(60, 60, 100, 100, FBPRIMCLR_MAGENTA, False)
-upiwin_tmp.filled_rectangle(110, 60, 150, 100, FBPRIMCLR_YELLOW, False)
-upiwin_tmp.rectangle(10, 110, 150, 150, FBPRIMCLR_WHITE, False)
-upiwin_tmp.line(10, 110, 150, 150, FBPRIMCLR_WHITE, False)
-upiwin_tmp.line(10, 150, 150, 110, FBPRIMCLR_WHITE, False)
+upiwin_tmp.filled_rectangle(10, 10, 50, 50, upiwin_tmp.FBPRIMCLR_RED, False)
+upiwin_tmp.filled_rectangle(60, 10, 100, 50, upiwin_tmp.FBPRIMCLR_GREEN, False)
+upiwin_tmp.filled_rectangle(110, 10, 150, 50, upiwin_tmp.FBPRIMCLR_BLUE, False)
+upiwin_tmp.filled_rectangle(10, 60, 50, 100, upiwin_tmp.FBPRIMCLR_CYAN, False)
+upiwin_tmp.filled_rectangle(60, 60, 100, 100, upiwin_tmp.FBPRIMCLR_MAGENTA, False)
+upiwin_tmp.filled_rectangle(110, 60, 150, 100, upiwin_tmp.FBPRIMCLR_YELLOW, False)
+upiwin_tmp.rectangle(10, 110, 150, 150, upiwin_tmp.FBPRIMCLR_WHITE, False)
+upiwin_tmp.line(10, 110, 150, 150, upiwin_tmp.FBPRIMCLR_WHITE, False)
+upiwin_tmp.line(10, 150, 150, 110, upiwin_tmp.FBPRIMCLR_WHITE, False)

-upiwin_tmp.line(0, 180, 319, 180, FBPRIMCLR_RED, False);
-upiwin_tmp.line(0, 196, 319, 196, FBPRIMCLR_RED, False);
+upiwin_tmp.line(0, 180, 319, 180, upiwin_tmp.FBPRIMCLR_RED, False);
+upiwin_tmp.line(0, 196, 319, 196, upiwin_tmp.FBPRIMCLR_RED, False);
 upiwin_tmp.textout(10, 180, 'Amy was here!!!')
+
+msg = {}
+while upiwin.get_message(msg):
+	if msg['message'] == upiwin.WM_HWBUTTONDOWN:
+		print("Button {0} was pressed.".format(msg['attrs'][0]))
+	elif msg['message'] == upiwin.WM_HWBUTTONUP:
+		print("Button {0} was released.".format(msg['attrs'][0]))
+	elif msg['message'] == upiwin.WM_HWBUTTONCLICK:
+		print("Button {0} was clicked.".format(msg['attrs'][0]))
+		bn = msg['attrs'][0]
+		if bn == 1:
+			print("Backlight ON.")
+			upiwin.set_backlight(True)
+		elif bn == 2:
+			print("Backlight OFF.")
+			upiwin.set_backlight(False)
+		elif bn == 4:
+			print("Quitting the application.")
+			upiwin.post_quit_message(0)
+	elif msg['message'] == upiwin.WM_TOUCHDOWN:
+		log_touch('DOWN', msg['attrs'][0], msg['attrs'][1])
+	elif msg['message'] == upiwin.WM_TOUCHMOVE:
+		log_touch('MOVE', msg['attrs'][0], msg['attrs'][1])
+	elif msg['message'] == upiwin.WM_TOUCHUP:
+		log_touch('UP', msg['attrs'][0], msg['attrs'][1])
+	elif msg['message'] == upiwin.WM_TOUCHCLICK:
+		log_touch('CLICK', msg['attrs'][0], msg['attrs'][1])
--- a/src/Makefile
+++ b/src/Makefile
@ -1,8 +1,31 @@
-OBJS=main.o sysinput.o ep_init.o ep_upiwin.o ep_backlight.o ep_upiwin_tmp.o ep_util.o fbinit.o fontengine.o fbprimitive.o \
-     log.o gpio.o msg_queue.o time_func.o config.o splash.o
+# UPIWIN - Micro Pi Windowing Framework Kernel
+# Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+# ------------------------------------------------------------------------
+BUILDUTILS=../buildutils
+RESOURCES=../resources
+SPLASHSCREEN=splash-vmwcblk.png
+
+OBJS=main.o sysinput.o ep_init.o ep_upiwin.o ep_backlight.o ep_msg.o ep_graphics.o ep_devctxt.o ep_bitmap.o \
+     ep_upiwin_tmp.o ep_util.o fbinit.o rect.o gfxobj.o devctxt.o dc_screen.o fontengine.o \
+	 bitmap.o stockobj.o fbprimitive.o log.o gpio.o msg_queue.o time_func.o config.o \
+	 i_freehand.o i_line.o i_rect.o i_fillrect.o i_undo.o i_clear.o splash.o
 LIBS=-lpython3.7m -lcrypt -lfreetype -lbcm2835 -lpthread -ldl -lutil -lm
 CFLAGS=-I/usr/include/python3.7m -I/usr/include/freetype2 -I/usr/include/libpng16 \
-       -Wall -fstack-protector -fwrapv -fno-PIE -g -O3 -DDEBUG_ASSERT
+       -Wall -Werror -fstack-protector -fwrapv -fno-PIE -g -O3 -DDEBUG_ASSERT
 LDFLAGS=-L/usr/lib/python3.7/config-3.7m-arm-linux-gnueabihf -Xlinker -export-dynamic -Wl,-O1 \
        -Wl,-Bsymbolic-functions

@ -14,12 +37,30 @@ upiwin: $(OBJS)
 .c.o:
 	gcc -c $(CFLAGS) $<

-splash.o: splash.bin
+%.o: %.bin
 	objcopy -I binary -O elf32-littlearm -B arm --rename-section \
-		.data=.rodata,alloc,load,readonly,data,contents splash.bin splash.o
+		.data=.rodata,alloc,load,readonly,data,contents $< $@

-splash.bin: splash.png ../buildutils/mksplash
-	../buildutils/mksplash splash.png splash.bin
+splash.bin: $(RESOURCES)/$(SPLASHSCREEN) $(BUILDUTILS)/mkgfx
+	$(BUILDUTILS)/mkgfx $(RESOURCES)/$(SPLASHSCREEN) splash.bin
+
+i_freehand.bin: $(RESOURCES)/i_freehand.png $(BUILDUTILS)/mkgfx
+	$(BUILDUTILS)/mkgfx $(RESOURCES)/i_freehand.png i_freehand.bin
+
+i_line.bin: $(RESOURCES)/i_line.png $(BUILDUTILS)/mkgfx
+	$(BUILDUTILS)/mkgfx $(RESOURCES)/i_line.png i_line.bin
+
+i_rect.bin: $(RESOURCES)/i_rect.png $(BUILDUTILS)/mkgfx
+	$(BUILDUTILS)/mkgfx $(RESOURCES)/i_rect.png i_rect.bin
+
+i_fillrect.bin: $(RESOURCES)/i_fillrect.png $(BUILDUTILS)/mkgfx
+	$(BUILDUTILS)/mkgfx $(RESOURCES)/i_fillrect.png i_fillrect.bin
+
+i_undo.bin: $(RESOURCES)/i_undo.png $(BUILDUTILS)/mkgfx
+	$(BUILDUTILS)/mkgfx $(RESOURCES)/i_undo.png i_undo.bin
+
+i_clear.bin: $(RESOURCES)/i_clear.png $(BUILDUTILS)/mkgfx
+	$(BUILDUTILS)/mkgfx $(RESOURCES)/i_clear.png i_clear.bin

 clean:
 	rm -f upiwin *.o splash.bin *~
--- a/src/bitmap.c
+++ b/src/bitmap.c
@ -0,0 +1,44 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#include <stdlib.h>
+#include <string.h>
+#include "bitmap.h"
+
+PBITMAP BMP_Create(INT32 width, INT32 height, const void *bits)
+{
+  PBITMAP rc;
+  UINT32 tot_size = sizeof(BITMAP) + (width * height * sizeof(UINT16));
+
+  rc = (PBITMAP)malloc(tot_size);
+  if (!rc)
+    return NULL;
+  memset(rc, 0, tot_size);
+  _Go_init(&(rc->hdr), BMP_SIG_WORD, tot_size);
+  rc->width = width;
+  rc->height = height;
+  if (bits)
+    memcpy(rc->bits, bits, width * height * sizeof(UINT16));
+  return rc;
+}
+
+void BMP_Delete(PBITMAP pbmp)
+{
+  Go_release(&(pbmp->hdr));
+}
--- a/src/bitmap.h
+++ b/src/bitmap.h
@ -0,0 +1,40 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#ifndef __BITMAP_H_INCLUDED
+#define __BITMAP_H_INCLUDED
+
+#include "wintype.h"
+#include "gfxobj.h"
+
+#define BMP_SIG_WORD  0x706D4221    /* !Bmp */
+
+typedef struct tagBITMAP {
+  GFXOBJECT hdr;
+  INT32 width;
+  INT32 height;
+  UINT16 bits[0];
+} BITMAP, *PBITMAP;
+
+extern PBITMAP BMP_Create(INT32 width, INT32 height, const void *bits);
+extern void BMP_Delete(PBITMAP pbmp);
+
+extern PBITMAP _BMP_GetStock(PCSTR name);
+
+#endif /* __BITMAP_H_INCLUDED */
--- a/src/config.c
+++ b/src/config.c
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #include <stdio.h>
 #include <stdlib.h>
 #include <limits.h>
@ -70,6 +89,8 @@ static void init_defaults(void)
  Gconfig.python_loc = "/usr/bin/python3";
  Gconfig.button_debounce = 100;
  Gconfig.sys_mq_length = 64;
+  Gconfig.click_time = 500;
+  Gconfig.click_radius = 2;
 }

 static HRESULT parse_cmdline(int argc, char *argv[], GLOBAL_CONFIG *parsed)
@ -187,6 +208,12 @@ HRESULT Config_setup(int argc, char *argv[])
  HRESULT hr;
  GLOBAL_CONFIG from_commandline;
  
+  if (geteuid() != 0)
+  {
+	Log(LFATAL, "upiwin must be run with root privileges");
+	return E_ACCESSDENIED;
+  }
+  
  if (atexit(run_exit_funcs))
  {
    Log(LFATAL, "Unable to set up exit function mechanism");
--- a/src/config.h
+++ b/src/config.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __CONFIG_H_INCLUDED
 #define __CONFIG_H_INCLUDED

@ -12,6 +31,8 @@ typedef struct tagGLOBAL_CONFIG {
  PCSTR python_loc;            /* location of the Python3 executable */
  UINT32 button_debounce;      /* minimum time between button up and next button down (ms) */
  UINT32 sys_mq_length;        /* length of system message queue */
+  UINT32 click_time;           /* time between button/touch DOWN and UP to be considered a "click" (ms) */
+  UINT32 click_radius;         /* maximum number of pixels a touch can "drift" to be considered a "click" */
  PCSTR script_name;           /* script name to be run */
  INT32 script_arg_count;      /* number of arguments to pass to the script */
  PPCSTR script_args;          /* arguments to pass to the script */
--- a/src/dc_screen.c
+++ b/src/dc_screen.c
@ -0,0 +1,309 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#include <stdlib.h>
+#include <string.h>
+#include "log.h"
+#include "fbinit.h"
+#include "devctxt.h"
+#include "dc_screen.h"
+#include "bitmap.h"
+
+inline static PUINT16 loc_from_coords(PSCREENPRIVDATA priv, INT32 x, INT32 y)
+{
+  return priv->pdata + (y * priv->pix_per_row) + x;
+}
+
+inline static UINT16 native_from_COLORREF(COLORREF cr)
+{
+  return (UINT16)(((cr << 8) & 0xF800) | ((cr >> 5) & 0x7E0) | ((cr >> 19) & 0x1F));
+}
+
+inline static COLORREF COLORREF_from_native(UINT16 cr)
+{
+  UINT32 tmp = cr;
+  return (COLORREF)(((tmp << 19) & 0xF80000) | ((tmp << 5) & 0xFC00) | ((tmp >> 8) & 0xF800));
+}
+
+static inline UINT16 apply_rop2(INT32 op, UINT16 disp, UINT16 pen)
+{
+  switch (op)
+  {
+    case R2_BLACK:
+	  return 0;
+	case R2_NOTMERGEPEN:
+	  return ~(disp | pen);
+	case R2_MASKNOTPEN:
+	  return disp & (~pen);
+	case R2_NOTCOPYPEN:
+	  return ~pen;
+	case R2_MASKPENNOT:
+	  return (~disp) & pen;
+	case R2_NOT:
+	  return ~disp;
+    case R2_XORPEN:
+	  return disp ^ pen;
+	case R2_NOTMASKPEN:
+	  return ~(disp & pen);
+	case R2_MASKPEN:
+	  return disp & pen;
+	case R2_NOTXORPEN:
+	  return ~(disp ^ pen);
+    case R2_NOP:
+	  return disp;
+	case R2_MERGENOTPEN:
+	  return disp | (~pen);
+    case R2_COPYPEN:
+	  return pen;
+	case R2_MERGEPENNOT:
+	  return (~disp) | pen;
+	case R2_MERGEPEN:
+	  return disp | pen;
+	case R2_WHITE:
+	  return (UINT16)(-1);
+  }
+  return pen; /* last ditch default */
+}
+
+static COLORREF screen_set_pixel(PVOID privdata, INT32 x, INT32 y, COLORREF color, INT32 op)
+{
+  PSCREENPRIVDATA priv = (PSCREENPRIVDATA)privdata;
+  UINT16 pencolor = native_from_COLORREF(color);
+  PUINT16 loc = loc_from_coords(priv, x, y);
+  UINT16 screen = *loc;
+  *loc = apply_rop2(op, screen, pencolor);
+  return COLORREF_from_native(screen);
+}
+
+static BOOL screen_line(PVOID privdata, INT32 x1, INT32 y1, INT32 x2, INT32 y2, COLORREF color, INT32 op)
+{
+  PSCREENPRIVDATA priv = (PSCREENPRIVDATA)privdata;
+  UINT16 pencolor = native_from_COLORREF(color);
+  INT32 dx = x2 - x1;
+  INT32 dy = y2 - y1;
+  INT32 tmp;
+  PUINT16 loc;
+  
+  ASSERT(x1 >= 0);
+  ASSERT(x1 < Fb_Info->width);
+  ASSERT(y1 >= 0);
+  ASSERT(y1 < Fb_Info->height);
+  ASSERT(x2 >= 0);
+  ASSERT(x2 < Fb_Info->width);
+  ASSERT(y2 >= 0);
+  ASSERT(y2 < Fb_Info->height);
+  
+  /* uses Bresenham's line algorithm with 16-bit fixed-point arithmetic */
+  if (ABS(dx) < ABS(dy))
+  {
+    if (y1 > y2)
+	{
+	  tmp = x1;
+	  x1 = x2;
+	  x2 = tmp;
+	  tmp = y1;
+	  y1 = y2;
+	  y2 = tmp;
+	  dx = -dx;
+	  dy = -dy;
+	}
+	loc = loc_from_coords(priv, x1, y1);
+	tmp = x1;
+	x1 <<= 16;
+	dx = (dx << 16) / dy;
+	while (y1 <= y2)
+	{
+	  *loc = apply_rop2(op, *loc, pencolor);
+	  x1 += dx;
+	  ++y1;
+	  loc += priv->pix_per_row;
+	  if (tmp != (x1 >> 16))
+	  {
+	    loc += ((x1 >> 16) - tmp);
+		tmp = x1 >> 16;
+	  }
+	}
+  }
+  else
+  {
+    if (x1 > x2)
+	{
+	  tmp = x1;
+	  x1 = x2;
+	  x2 = tmp;
+	  tmp = y1;
+	  y1 = y2;
+	  y2 = tmp;
+	  dx = -dx;
+	  dy = -dy;
+	}
+	loc = loc_from_coords(priv, x1, y1);
+	tmp = y1;
+    y1 <<= 16;
+    dy = dx ? (dy << 16) / dx : 0;
+	while (x1 <= x2)
+	{
+	  *loc = apply_rop2(op, *loc, pencolor);
+	  y1 += dy;
+	  ++x1;
+	  ++loc;
+	  if (tmp != (y1 >> 16))
+	  {
+	    loc += (((y1 >> 16) - tmp) * priv->pix_per_row);
+	    tmp = y1 >> 16;
+	  }
+	}
+  }
+  return TRUE;
+}
+
+static BOOL screen_solid_rect(PVOID privdata, PRECT rect, COLORREF color, INT32 op)
+{
+  PSCREENPRIVDATA priv = (PSCREENPRIVDATA)privdata;
+  UINT16 pencolor = native_from_COLORREF(color);
+  PUINT16 ps, p;
+  int y, x;
+  
+  ps = loc_from_coords(priv, rect->left, rect->top);
+  for (y = rect->top; y < rect->bottom; y++)
+  {
+    p = ps;
+	for (x = rect->left; x < rect->right; x++)
+	{
+	  *p = apply_rop2(op, *p, pencolor);
+	  ++p;
+	}
+	ps += priv->pix_per_row;
+  }
+  return TRUE;
+}
+
+static const DCFUNTABLE screen_funtable; /* forward declaration */
+static void screen_context_destroy(PVOID obj);
+
+static PDCTXT screen_create_compat(PVOID privdata)
+{
+  PSCREENPRIVDATA priv_new;
+  PBITMAP pbmp;
+  PDCTXT rc;
+  
+  pbmp = BMP_Create(1, 1, NULL);
+  if (!pbmp)
+    return NULL;
+  priv_new = (PSCREENPRIVDATA)malloc(sizeof(SCREENPRIVDATA));
+  if (!priv_new)
+  {
+    Go_release(&(pbmp->hdr));
+    return NULL;
+  }
+  priv_new->pix_per_row = pbmp->width;
+  priv_new->pdata = pbmp->bits;
+  
+  rc = _DC_Allocate(&screen_funtable, priv_new);
+  if (rc)
+  {
+    rc->hdr.dtor = screen_context_destroy;
+	rc->flags = DCFLG_IS_MEMORY;
+	rc->baserect.left = rc->baserect.top = 0;
+	rc->baserect.right = pbmp->width;
+	rc->baserect.bottom = pbmp->height;
+	memcpy(&(rc->cliprect), &(rc->baserect), sizeof(RECT));
+	rc->cur_bitmap = pbmp;
+  }
+  else
+  {
+    free(priv_new);
+	Go_release(&(pbmp->hdr));
+  }
+  return rc;
+}
+
+BOOL screen_new_bitmap(PVOID privdata, PBITMAP pbmp)
+{
+  PSCREENPRIVDATA priv = (PSCREENPRIVDATA)privdata;
+  priv->pix_per_row = pbmp->width;
+  priv->pdata = pbmp->bits;
+  return TRUE;
+}
+
+BOOL screen_bitblt(PVOID p_dest, PRECT r_dest, PVOID p_src, PRECT r_src, UINT32 op)
+{
+  PSCREENPRIVDATA dest = (PSCREENPRIVDATA)p_dest;
+  PSCREENPRIVDATA src = (PSCREENPRIVDATA)p_src;
+  PUINT16 pd, ps;
+  INT32 width, i;
+  
+  pd = loc_from_coords(dest, r_dest->left, r_dest->top);
+  ps = loc_from_coords(src, r_src->left, r_src->top);
+  width = r_src->right - r_src->left;
+  for (i = r_src->top; i < r_src->bottom; ++i)
+  {
+    memcpy(pd, ps, width * sizeof(UINT16));
+    pd += dest->pix_per_row;
+	ps += src->pix_per_row;
+  }
+  return TRUE;
+}
+
+static const DCFUNTABLE screen_funtable = {
+  screen_set_pixel,
+  screen_line,
+  screen_solid_rect,
+  screen_create_compat,
+  screen_new_bitmap,
+  screen_bitblt
+};
+
+static void screen_context_destroy(PVOID obj)
+{
+  PDCTXT pdctxt = (PDCTXT)obj;
+  _DC_FinalizeCommon(pdctxt);
+  free(pdctxt->privdata);
+}
+
+PDCTXT DC_CreateScreenContext(void)
+{
+  PDCTXT rc;
+  PSCREENPRIVDATA priv;
+  
+  priv = (PSCREENPRIVDATA)malloc(sizeof(SCREENPRIVDATA));
+  if (!priv)
+    return NULL;
+  priv->pix_per_row = Fb_Info->width;
+  priv->pdata = Fb_Ptr;
+  
+  rc = _DC_Allocate(&screen_funtable, priv);
+  if (rc)
+  {
+    rc->hdr.dtor = screen_context_destroy;
+	rc->flags = DCFLG_IS_SCREEN;
+	rc->baserect.left = rc->baserect.top = 0;
+	rc->baserect.right = Fb_Info->width;
+	rc->baserect.bottom = Fb_Info->height;
+	memcpy(&(rc->cliprect), &(rc->baserect), sizeof(RECT));
+  }
+  else
+    free(priv);
+  return rc;
+}
+
+PDCTXT _DC_CreateScreenCompatibleContext(void)
+{
+  return screen_create_compat(NULL);
+}
--- a/src/dc_screen.h
+++ b/src/dc_screen.h
@ -0,0 +1,34 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#ifndef __DC_SCREEN_H_INCLUDED
+#define __DC_SCREEN_H_INCLUDED
+
+#include "wintype.h"
+#include "gfxtype.h"
+
+typedef struct tagSCREENPRIVDATA {
+	UINT32 pix_per_row;
+	UINT16 *pdata;
+} SCREENPRIVDATA, *PSCREENPRIVDATA;
+
+extern PDCTXT DC_CreateScreenContext(void);
+extern PDCTXT _DC_CreateScreenCompatibleContext(void);
+
+#endif /* __DC_SCREEN_H_INCLUDED */
--- a/src/devctxt.c
+++ b/src/devctxt.c
@ -0,0 +1,263 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#include <string.h>
+#include <stdlib.h>
+#include "log.h"
+#include "gfxtype.h"
+#include "gfxobj.h"
+#include "devctxt.h"
+#include "bitmap.h"
+#include "dc_screen.h"
+
+inline static BYTE line_clip_outcode(INT32 x, INT32 y, INT32 xmin, INT32 ymin, INT32 xmax, INT32 ymax)
+{
+  BYTE rc = 0;
+  if (y < ymin)
+    rc |= 0x8;
+  else if (y >= ymax)
+    rc |= 0x4;
+  if (x < xmin)
+    rc |= 0x1;
+  else if (x >= xmax)
+    rc |= 0x2;
+  return rc;
+}
+
+#define CPX 8  /* clipping precision in bits */
+
+#define ONE (1 << CPX)  /* constant for mathematics */
+
+/* these macros keep the number of bits straight when doing fixed-point multiply & divide */
+#define M(a, b)  ((((a) * (b))) >> CPX)
+#define D(a, b)  (((a) << CPX) / (b))
+
+static BOOL line_clip(PINT32 output, INT32 x1, INT32 y1, INT32 x2, INT32 y2, INT32 xmin, INT32 ymin, INT32 xmax, INT32 ymax)
+{
+  BYTE outcode1, outcode2;
+  INT32 tmp;
+  int nloop = 0;
+  
+  /* Cohen-Sutherland line-clipping algorithm (see Foley & Van Dam, pp. 145-149) */
+  for (;;)
+  {
+    if (++nloop == 20)
+	{
+	  Log(LDEBUG, "POSSIBLE INFINITE LOOP DETECTED - REJECTING");
+	  return FALSE;
+	}
+    outcode1 = line_clip_outcode(x1, y1, xmin, ymin, xmax, ymax);
+	outcode2 = line_clip_outcode(x2, y2, xmin, ymin, xmax, ymax);
+	if ((outcode1 & outcode2) != 0)
+	  return FALSE; /* trivial rejection */
+	else if ((outcode1 == 0) && (outcode2 == 0))
+	  break; /* trivial acceptance */
+	if (outcode1 == 0)
+	{
+	  tmp = x1;
+	  x1 = x2;
+	  x2 = tmp;
+	  tmp = y1;
+	  y1 = y2;
+	  y2 = tmp;
+	  outcode1 = outcode2;  /* we don't reference outcode2 in the rest of the loop */
+	}
+	if (outcode1 & 0x8)
+	{
+	  x1 += M(x2 - x1, D(ymin - y1, y2 - y1));
+	  y1 = ymin;
+	}
+	else if (outcode1 & 0x4)
+	{
+	  x1 += M(x2 - x1, D(ymax - ONE - y1, y2 - y1));
+	  y1 = ymax - ONE;
+	}
+	else if (outcode1 & 0x2)
+	{
+	  y1 += M(y2 - y1, D(xmax - ONE - x1, x2 - x1));
+	  x1 = xmax - ONE;
+	}
+	else if (outcode1 & 0x1)
+	{
+	  y1 += M(y2 - y1, D(xmin - x1, x2 - x1));
+	  x1 = xmin;
+	}
+  }
+  output[0] = x1;
+  output[1] = y1;
+  output[2] = x2;
+  output[3] = y2;
+  return TRUE;
+}
+
+static BOOL internal_line(PDCTXT pdctxt, INT32 x1, INT32 y1, INT32 x2, INT32 y2)
+{
+  INT32 buffer[4];
+  if (line_clip(buffer, x1 << CPX, y1 << CPX, x2 << CPX, y2 << CPX, pdctxt->cliprect.left << CPX, pdctxt->cliprect.top << CPX,
+				pdctxt->cliprect.right << CPX, pdctxt->cliprect.bottom << CPX))
+    return (*pdctxt->funcs->line)(pdctxt->privdata, buffer[0] >> CPX, buffer[1] >> CPX, buffer[2] >> CPX, buffer[3] >> CPX, pdctxt->color, pdctxt->rop2);
+  return TRUE;
+}
+
+PDCTXT _DC_Allocate(PDCFUNTABLE funcs, PVOID privdata)
+{
+  PDCTXT rc = (PDCTXT)malloc(sizeof(DCTXT));
+  if (!rc)
+    return NULL;
+  memset(rc, 0, sizeof(DCTXT));
+  _Go_init(&(rc->hdr), DCTXT_SIG_WORD, sizeof(DCTXT));
+  rc->funcs = funcs;
+  rc->privdata = privdata;
+  rc->rop2 = R2_COPYPEN;
+  return rc;
+}
+
+void _DC_FinalizeCommon(PDCTXT pdctxt)
+{
+  if (pdctxt->cur_bitmap)
+    Go_release(&(pdctxt->cur_bitmap->hdr));
+}
+
+COLORREF DC_SetPixel(PDCTXT pdctxt, INT32 x, INT32 y, COLORREF color)
+{
+  if (!G_coords_in_rect(&(pdctxt->cliprect), x, y))
+	return (COLORREF)(-1);
+  return (*(pdctxt->funcs->set_pixel))(pdctxt->privdata, x, y, color, pdctxt->rop2);
+}
+
+BOOL DC_LineTo(PDCTXT pdctxt, INT32 x, INT32 y)
+{
+  BOOL rc = internal_line(pdctxt, pdctxt->pos.x, pdctxt->pos.y, x, y);
+  if (rc)
+  {
+    pdctxt->pos.x = x;
+	pdctxt->pos.y = y;
+  }
+  return rc;
+}
+
+BOOL DC_MoveTo(PDCTXT pdctxt, INT32 x, INT32 y, PPOINT oldpt)
+{
+  if (oldpt)
+    memcpy(oldpt, &(pdctxt->pos), sizeof(POINT));
+  pdctxt->pos.x = x;
+  pdctxt->pos.y = y;
+  return TRUE;
+}
+
+BOOL DC_Rectangle(PDCTXT pdctxt, INT32 left, INT32 top, INT32 right, INT32 bottom)
+{
+  internal_line(pdctxt, left, top, right - 1, top);
+  internal_line(pdctxt, left, top + 1, left, bottom - 2);
+  internal_line(pdctxt, right - 1, top + 1, right - 1, bottom - 2);
+  internal_line(pdctxt, left, bottom - 1, right - 1, bottom - 1);
+  return TRUE;
+}
+
+BOOL DC_SolidRectangle(PDCTXT pdctxt, INT32 left, INT32 top, INT32 right, INT32 bottom)
+{
+  RECT rect, actual;
+  G_set_rect(&rect, left, top, right, bottom);
+  if (!G_rect_intersect(&actual, &rect, &(pdctxt->cliprect)))
+    return TRUE;
+  return (*(pdctxt->funcs->solid_rect))(pdctxt->privdata, &actual, pdctxt->color, pdctxt->rop2);
+}
+
+UINT32 DC_GetROP2(PDCTXT pdctxt)
+{
+  return pdctxt->rop2;
+}
+
+UINT32 DC_SetROP2(PDCTXT pdctxt, UINT32 rop)
+{
+  UINT32 rc = pdctxt->rop2;
+  pdctxt->rop2 = rop;
+  return rc;
+}
+
+COLORREF DC_GetTextColor(PDCTXT pdctxt)
+{
+  return pdctxt->color;
+}
+
+COLORREF DC_SetTextColor(PDCTXT pdctxt, COLORREF cr)
+{
+  COLORREF rc = pdctxt->color;
+  pdctxt->color = cr;
+  return rc;
+}
+
+BOOL DC_GetClipRect(PDCTXT pdctxt, PRECT prect)
+{
+  memcpy(prect, &(pdctxt->cliprect), sizeof(RECT));
+  return TRUE;
+}
+
+BOOL DC_SetClipRect(PDCTXT pdctxt, PRECT prect)
+{
+  memcpy(&(pdctxt->cliprect), prect, sizeof(RECT));
+  return TRUE;
+}
+
+PDCTXT DC_CreateCompatible(PDCTXT pdctxt)
+{
+  if (pdctxt)
+    return (*(pdctxt->funcs->create_compat))(pdctxt->privdata);
+  return _DC_CreateScreenCompatibleContext();
+}
+
+PGFXOBJECT DC_SelectObject(PDCTXT pdctxt, PGFXOBJECT pobj)
+{
+  if (pobj->sig == BMP_SIG_WORD)
+  {
+    if ((pdctxt->flags & DCFLG_TYPES) == DCFLG_IS_MEMORY)
+	{
+	  RECT rtmp;
+      PBITMAP rbmp = pdctxt->cur_bitmap;
+      Go_addref(pobj);
+	  if ((*(pdctxt->funcs->new_bitmap))(pdctxt->privdata, (PBITMAP)pobj))
+	  {
+	    pdctxt->cur_bitmap = (PBITMAP)pobj;
+		pdctxt->baserect.left = pdctxt->baserect.top = 0;
+		pdctxt->baserect.right = ((PBITMAP)pobj)->width;
+		pdctxt->baserect.bottom = ((PBITMAP)pobj)->height;
+		G_rect_intersect(&rtmp, &(pdctxt->baserect), &(pdctxt->cliprect));
+		memcpy(&(pdctxt->cliprect), &rtmp, sizeof(RECT));
+	    return (PGFXOBJECT)rbmp;
+	  }
+	  Go_release(pobj);
+	}
+  }
+  return NULL;
+}
+
+BOOL DC_BitBlt(PDCTXT dest, INT32 x, INT32 y, INT32 width, INT32 height, PDCTXT source, INT32 x1, INT32 y1, UINT32 rop)
+{
+  RECT destrect, actualdest, srcrect, actualsrc;
+  
+  G_set_rect(&destrect, x, y, x + width, y + height);
+  if (!G_rect_intersect(&actualdest, &destrect, &(dest->cliprect)))
+    return TRUE;  /* no-op */
+  G_set_rect(&srcrect, x1, y1, x1 + (actualdest.right - actualdest.left), y1 + (actualdest.bottom - actualdest.top));
+  if (!G_rect_intersect(&actualsrc, &srcrect, &(source->baserect)))
+    return TRUE;
+  actualdest.right = actualdest.left + (actualsrc.right - actualsrc.left);
+  actualdest.bottom = actualdest.top + (actualsrc.bottom - actualsrc.top);
+  return (*(dest->funcs->bitblt))(dest->privdata, &actualdest, source->privdata, &actualsrc, rop);
+}
--- a/src/devctxt.h
+++ b/src/devctxt.h
@ -0,0 +1,106 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#ifndef __DEVCTXT_H_INCLUDED
+#define __DEVCTXT_H_INCLUDED
+
+#include "wintype.h"
+#include "gfxtype.h"
+#include "gfxobj.h"
+#include "bitmap.h"
+
+#define DCTXT_SIG_WORD  0x78744344   /* "DCtx */
+
+/* Raster operation codes */
+#define R2_BLACK        1
+#define R2_NOTMERGEPEN  2
+#define R2_MASKNOTPEN   3
+#define R2_NOTCOPYPEN   4
+#define R2_MASKPENNOT   5
+#define R2_NOT          6
+#define R2_XORPEN       7
+#define R2_NOTMASKPEN   8
+#define R2_MASKPEN      9
+#define R2_NOTXORPEN    10
+#define R2_NOP          11
+#define R2_MERGENOTPEN  12
+#define R2_COPYPEN      13
+#define R2_MERGEPENNOT  14
+#define R2_MERGEPEN     15
+#define R2_WHITE        16
+
+struct tagDCTXT; /* forward declaration */
+
+typedef COLORREF (*DCtx_SetPixel)(PVOID privdata, INT32 x, INT32 y, COLORREF color, INT32 op);
+typedef BOOL (*DCtx_Line)(PVOID privdata, INT32 x1, INT32 y1, INT32 x2, INT32 y2, COLORREF color, INT32 op);
+typedef BOOL (*DCtx_SolidRect)(PVOID privdata, PRECT rect, COLORREF color, INT32 op);
+typedef struct tagDCTXT *(*DCtx_CreateCompat)(PVOID privdata);
+typedef BOOL (*DCtx_NewBitmap)(PVOID privdata, PBITMAP pbmp);
+typedef BOOL (*DCtx_BitBlt)(PVOID p_dest, PRECT r_dest, PVOID p_src, PRECT r_src, UINT32 op);
+
+typedef struct tagDCFUNTABLE {
+  DCtx_SetPixel set_pixel;          /* sets a single pixel on the display */
+  DCtx_Line line;                   /* draws a line on the display */
+  DCtx_SolidRect solid_rect;        /* draws a solid rectangle on the display */
+  DCtx_CreateCompat create_compat;  /* create a memory DC compatible with this one */
+  DCtx_NewBitmap new_bitmap;        /* new bitmap selected notification */
+  DCtx_BitBlt bitblt;               /* bit block transfer */
+} DCFUNTABLE;
+
+typedef const DCFUNTABLE *PDCFUNTABLE;
+
+typedef struct tagDCTXT {
+  GFXOBJECT hdr;      /* the header of all objects */
+  PDCFUNTABLE funcs;  /* device context functions */
+  PVOID privdata;     /* private data for the type of DC */
+  UINT32 flags;       /* flags for the DC */
+  RECT baserect;      /* base rectangle */
+  RECT cliprect;      /* clipping rectangle */
+  POINT pos;          /* current position */
+  UINT32 rop2;        /* current raster operation */
+  COLORREF color;     /* current drawing color (XXX replace with pens later) */
+  PBITMAP cur_bitmap; /* current selected bitmap */
+} DCTXT, *PDCTXT;
+
+#define DCFLG_TYPES      0x03
+#define DCFLG_IS_SCREEN  0x00
+#define DCFLG_IS_MEMORY  0x01
+
+extern PDCTXT _DC_Allocate(PDCFUNTABLE funcs, PVOID privdata);
+extern void _DC_FinalizeCommon(PDCTXT pdctxt);
+
+extern COLORREF DC_SetPixel(PDCTXT pdctxt, INT32 x, INT32 y, COLORREF color);
+extern BOOL DC_LineTo(PDCTXT pdctxt, INT32 x, INT32 y);
+extern BOOL DC_MoveTo(PDCTXT pdctxt, INT32 x, INT32 y, PPOINT oldpt);
+extern BOOL DC_Rectangle(PDCTXT pdctxt, INT32 left, INT32 top, INT32 right, INT32 bottom);
+extern BOOL DC_SolidRectangle(PDCTXT pdctxt, INT32 left, INT32 top, INT32 right, INT32 bottom);
+extern UINT32 DC_GetROP2(PDCTXT pdctxt);
+extern UINT32 DC_SetROP2(PDCTXT pdctxt, UINT32 rop);
+extern COLORREF DC_GetTextColor(PDCTXT pdctxt);
+extern COLORREF DC_SetTextColor(PDCTXT pdctxt, COLORREF cr);
+extern BOOL DC_GetClipRect(PDCTXT pdctxt, PRECT prect);
+extern BOOL DC_SetClipRect(PDCTXT pdctxt, PRECT prect);
+extern PDCTXT DC_CreateCompatible(PDCTXT pdctxt);
+extern PGFXOBJECT DC_SelectObject(PDCTXT pdctxt, PGFXOBJECT pobj);
+extern BOOL DC_BitBlt(PDCTXT dest, INT32 x, INT32 y, INT32 width, INT32 height, PDCTXT source, INT32 x1, INT32 y1, UINT32 rop);
+
+#define DC_addref(pdctxt)   Go_addref(&(pdctxt->hdr))
+#define DC_release(pdctxt)  Go_release(&(pdctxt->hdr))
+
+#endif /* __DEVCTXT_H_INCLUDED */
--- a/src/ep_backlight.c
+++ b/src/ep_backlight.c
@ -1,6 +1,26 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "scode.h"
+#include "log.h"
 #include "gpio.h"
 #include "ep_upiwin.h"
 #include "ep_init.h"
--- a/src/ep_bitmap.c
+++ b/src/ep_bitmap.c
@ -0,0 +1,154 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#include <string.h>
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#include "scode.h"
+#include "log.h"
+#include "gfxobj.h"
+#include "bitmap.h"
+#include "ep_types.h"
+
+static PyMethodDef BitmapMethods[] = {
+  {NULL, NULL, 0, NULL}
+};
+
+static PyObject *bitmap_get_width(BitmapObject *self, void *closure)
+{
+  if (!(self->pbmp))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad bitmap object");
+    return NULL;
+  }
+  return PyLong_FromUnsignedLong(self->pbmp->width);
+}
+
+static PyObject *bitmap_get_height(BitmapObject *self, void *closure)
+{
+  if (!(self->pbmp))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad bitmap object");
+    return NULL;
+  }
+  return PyLong_FromUnsignedLong(self->pbmp->height);
+}
+
+static PyGetSetDef BitmapProperties[] = {
+  {"width", (getter)bitmap_get_width, NULL,
+   "Width of this bitmap", NULL},
+  {"height", (getter)bitmap_get_height, NULL,
+   "Height of this bitmap", NULL},
+  {NULL, NULL, NULL, NULL, NULL}
+};
+
+static int bitmap_init(BitmapObject *self, PyObject *args, PyObject *kwds)
+{
+  static char *kwlist[] = { "stock", "width", "height", NULL };
+  const char *stock;
+  int width = 0, height = 0;
+  
+  if (!PyArg_ParseTupleAndKeywords(args, kwds, "|$sii", kwlist, &stock, &width, &height))
+    return -1;
+  
+  if (stock)
+  {
+	self->pbmp = _BMP_GetStock(stock);
+	if (!(self->pbmp))
+	{
+	  PyErr_Format(PyExc_RuntimeError, "no such stock bitmap: '%s'", stock);
+	  return -1;
+	}
+  }
+  else
+  {
+    width = MAX(1, width);
+    height = MAX(1, height);
+    self->pbmp = BMP_Create(width, height, NULL);
+    if (!(self->pbmp))
+    {
+	  PyErr_SetString(PyExc_RuntimeError, "unable to create bitmap");
+	  return -1;
+    }
+  }
+  return 0;
+}
+
+static void bitmap_dealloc(BitmapObject *self)
+{
+  if (self->pbmp)
+    BMP_Delete(self->pbmp);
+  Py_TYPE(self)->tp_free((PyObject *)self);
+}
+
+PyTypeObject BitmapType = {
+  PyVarObject_HEAD_INIT(NULL, 0)
+  .tp_name = "upiwin.Bitmap",
+  .tp_doc = "Bitmap object",
+  .tp_basicsize = sizeof(BitmapObject),
+  .tp_itemsize = 0,
+  .tp_flags = Py_TPFLAGS_DEFAULT,
+  .tp_new = PyType_GenericNew,
+  .tp_init = (initproc)bitmap_init,
+  .tp_dealloc = (destructor)bitmap_dealloc,
+  .tp_methods = BitmapMethods,
+  .tp_getset = BitmapProperties,
+};
+
+HRESULT Epython_register_bitmap(PyObject *module)
+{
+  if (PyType_Ready(&BitmapType) < 0)
+	return E_FAIL;
+  Py_INCREF(&BitmapType);
+  if (PyModule_AddObject(module, "Bitmap", (PyObject *)(&BitmapType)) < 0)
+  {
+    Py_DECREF(&BitmapType);
+	return E_FAIL;
+  }
+  return S_OK;
+}
+
+PyObject *Epython_wrap_bitmap(PBITMAP pbmp)
+{
+  PyObject *rc = NULL, *args, *kwargs;
+  BitmapObject *pbitmapobj;
+  
+  args = PyTuple_New(0);
+  if (args)
+  {
+	kwargs = PyDict_New();
+	if (kwargs)
+	{
+	  rc = PyType_GenericNew(&BitmapType, args, kwargs);
+	  if (rc)
+	  {
+	    pbitmapobj = (BitmapObject *)rc;
+		if (pbitmapobj->pbmp)
+		  BMP_Delete(pbitmapobj->pbmp);
+		pbitmapobj->pbmp = pbmp;
+	  }
+	  Py_DECREF(kwargs);
+	}
+    Py_DECREF(args);
+  }
+  
+  if (!rc)
+    PyErr_SetString(PyExc_RuntimeError, "unable to create bitmap");
+  return rc;
+}
--- a/src/ep_devctxt.c
+++ b/src/ep_devctxt.c
@ -0,0 +1,370 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#include <string.h>
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#include "wintype.h"
+#include "scode.h"
+#include "log.h"
+#include "devctxt.h"
+#include "dc_screen.h"
+#include "ep_init.h"
+#include "ep_types.h"
+
+static PyObject *devctxt_set_pixel(DevCtxtObject *self, PyObject *args)
+{
+  INT32 x, y;
+  COLORREF color, rc;
+  
+  if (!PyArg_ParseTuple(args, "iik", &x, &y, &color))
+    return NULL;
+  if (!(self->pdctxt))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad device context");
+    return NULL;
+  }
+  rc = DC_SetPixel(self->pdctxt, x, y, color);
+  return PyLong_FromUnsignedLong(rc);
+}
+
+static PyObject *devctxt_line_to(DevCtxtObject *self, PyObject *args)
+{
+  INT32 x, y;
+  BOOL rc;
+
+  if (!PyArg_ParseTuple(args, "ii", &x, &y))
+    return NULL;
+  if (!(self->pdctxt))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad device context");
+    return NULL;
+  }
+  rc = DC_LineTo(self->pdctxt, x, y);
+  return PyBool_FromLong(rc);
+}
+
+static PyObject *devctxt_move_to(DevCtxtObject *self, PyObject *args)
+{
+  INT32 x, y;
+  BOOL rc;
+
+  if (!PyArg_ParseTuple(args, "ii", &x, &y))
+    return NULL;
+  if (!(self->pdctxt))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad device context");
+    return NULL;
+  }
+  rc = DC_MoveTo(self->pdctxt, x, y, NULL);
+  return PyBool_FromLong(rc);
+}
+
+static PyObject *devctxt_rectangle(DevCtxtObject *self, PyObject *args)
+{
+  INT32 left, top, right, bottom;
+  BOOL rc;
+  
+  if (!PyArg_ParseTuple(args, "iiii", &left, &top, &right, &bottom))
+    return NULL;
+  if (!(self->pdctxt))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad device context");
+    return NULL;
+  }
+  rc = DC_Rectangle(self->pdctxt, left, top, right, bottom);
+  return PyBool_FromLong(rc);
+}
+
+static PyObject *devctxt_solid_rectangle(DevCtxtObject *self, PyObject *args)
+{
+  INT32 left, top, right, bottom;
+  BOOL rc;
+  
+  if (!PyArg_ParseTuple(args, "iiii", &left, &top, &right, &bottom))
+    return NULL;
+  if (!(self->pdctxt))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad device context");
+    return NULL;
+  }
+  rc = DC_SolidRectangle(self->pdctxt, left, top, right, bottom);
+  return PyBool_FromLong(rc);
+}
+
+static PyObject *devctxt_bitblt(DevCtxtObject *self, PyObject *args)
+{
+  INT32 x, y, width, height, x1, y1;
+  UINT32 rop;
+  DevCtxtObject *source;
+  BOOL rc;
+  
+  if (!PyArg_ParseTuple(args, "iiiiO!iik", &x, &y, &width, &height, &DevCtxtType, &source, &x1, &y1, &rop))
+    return NULL;
+  if (!(self->pdctxt) || !(source->pdctxt))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad device context");
+    return NULL;
+  }
+
+  rc = DC_BitBlt(self->pdctxt, x, y, width, height, source->pdctxt, x1, y1, rop);
+  return PyBool_FromLong(rc);
+}
+
+static PyObject *devctxt_get_clip_rect(DevCtxtObject *self, PyObject *args)
+{
+  RECT rect;
+  
+  if (!PyArg_ParseTuple(args, ""))
+    return NULL;
+  if (!(self->pdctxt))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad device context");
+    return NULL;
+  }
+  DC_GetClipRect(self->pdctxt, &rect);
+  return Py_BuildValue("(i,i,i,i)", rect.left, rect.top, rect.right, rect.bottom);
+}
+
+static PyObject *devctxt_set_clip_rect(DevCtxtObject *self, PyObject *args)
+{
+  RECT rect;
+  BOOL rc;
+  
+  if (!PyArg_ParseTuple(args, "iiii", &(rect.left), &(rect.top), &(rect.right), &(rect.bottom)))
+    return NULL;
+  if (!(self->pdctxt))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad device context");
+    return NULL;
+  }
+  rc = DC_SetClipRect(self->pdctxt, &rect);
+  return PyBool_FromLong(rc);
+}
+
+static PyObject *devctxt_select_bitmap(DevCtxtObject *self, BitmapObject *newbmp)
+{
+  BitmapObject *old_bitmap = NULL;
+  PBITMAP old_pbmp;
+  
+  if ((self->pdctxt->flags & DCFLG_TYPES) != DCFLG_IS_MEMORY)
+  {
+    PyErr_SetString(PyExc_RuntimeError, "must select bitmap into memory device context");
+	return NULL;
+  }
+  old_bitmap = self->selected_bitmap;  
+  old_pbmp = (PBITMAP)DC_SelectObject(self->pdctxt, (PGFXOBJECT)(newbmp->pbmp));
+  if (!old_bitmap)
+  {
+    old_bitmap = (BitmapObject *)Epython_wrap_bitmap(old_pbmp);
+	if (!old_bitmap)
+	{
+	  DC_SelectObject(self->pdctxt, (PGFXOBJECT)old_pbmp);
+	  return NULL;
+	}
+	else
+	{
+	  Py_INCREF(old_bitmap);
+	  self->selected_bitmap = old_bitmap;
+	}
+  }
+  ASSERT(old_bitmap);
+  ASSERT(self->selected_bitmap);
+  ASSERT(newbmp);
+  Py_DECREF(self->selected_bitmap);
+  self->selected_bitmap = newbmp;
+  Py_INCREF(self->selected_bitmap);
+  return (PyObject *)old_bitmap;
+}
+
+static PyObject *devctxt_select_object(DevCtxtObject *self, PyObject *args)
+{
+  PyObject *obj;
+
+  if (!PyArg_ParseTuple(args, "O", &obj))
+    return NULL;
+  if (!obj)
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad object selected");
+	return NULL;
+  }
+  if (PyObject_TypeCheck(obj, &BitmapType))
+    return devctxt_select_bitmap(self, (BitmapObject *)obj);
+  PyErr_SetString(PyExc_RuntimeError, "unknown type of object selected");
+  return NULL;
+}
+
+static PyMethodDef DevCtxtMethods[] = {
+  {"set_pixel", (PyCFunction)devctxt_set_pixel, METH_VARARGS,
+   "Sets a single pixel on the display."},
+  {"line_to", (PyCFunction)devctxt_line_to, METH_VARARGS,
+   "Draws a line from the current position to the specified location."},
+  {"move_to", (PyCFunction)devctxt_move_to, METH_VARARGS,
+   "Draws a line from the current position to the specified location."},
+  {"rectangle", (PyCFunction)devctxt_rectangle, METH_VARARGS,
+   "Draws a rectangle."},
+  {"solid_rectangle", (PyCFunction)devctxt_solid_rectangle, METH_VARARGS,
+   "Draws a solid rectangle."},
+  {"bitblt", (PyCFunction)devctxt_bitblt, METH_VARARGS,
+   "Copy bits from one device context to another."},
+  {"select_object", (PyCFunction)devctxt_select_object, METH_VARARGS,
+   "Selects a graphic object into the device context."},
+  {"get_clip_rect", (PyCFunction)devctxt_get_clip_rect, METH_VARARGS,
+   "Returns the current clipping rectangle of the device context."},
+  {"set_clip_rect", (PyCFunction)devctxt_set_clip_rect, METH_VARARGS,
+   "Sets the current clipping rectangle of the device context."},
+  {NULL, NULL, 0, NULL}
+};
+
+static PyObject *devctxt_get_rop2(DevCtxtObject *self, void *closure)
+{
+  if (!(self->pdctxt))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad device context");
+    return NULL;
+  }
+  return PyLong_FromUnsignedLong(DC_GetROP2(self->pdctxt));
+}
+
+static int devctxt_set_rop2(DevCtxtObject *self, PyObject *value, void *closure)
+{
+  UINT32 v;
+  
+  if (!(self->pdctxt))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad device context");
+    return -1;
+  }
+  if (value == NULL)
+  {
+    PyErr_SetString(PyExc_TypeError, "Cannot delete this attribute");
+    return -1;
+  }
+  v = PyLong_AsUnsignedLong(value);
+  if (PyErr_Occurred())
+    return -1;
+  DC_SetROP2(self->pdctxt, v);
+  return 0;
+}
+
+static PyObject *devctxt_get_text_color(DevCtxtObject *self, void *closure)
+{
+  if (!(self->pdctxt))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad device context");
+    return NULL;
+  }
+  return PyLong_FromUnsignedLong(DC_GetTextColor(self->pdctxt));
+}
+
+static int devctxt_set_text_color(DevCtxtObject *self, PyObject *value, void *closure)
+{
+  COLORREF v;
+  
+  if (!(self->pdctxt))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "bad device context");
+    return -1;
+  }
+  if (value == NULL)
+  {
+    PyErr_SetString(PyExc_TypeError, "Cannot delete this attribute");
+    return -1;
+  }
+  v = PyLong_AsUnsignedLong(value);
+  if (PyErr_Occurred())
+    return -1;
+  DC_SetTextColor(self->pdctxt, v);
+  return 0;
+}
+
+static PyGetSetDef DevCtxtProperties[] = {
+  {"rop2", (getter)devctxt_get_rop2, (setter)devctxt_set_rop2,
+   "Current raster operation", NULL},
+  {"text_color", (getter)devctxt_get_text_color, (setter)devctxt_set_text_color,
+   "Current text color", NULL},
+  {NULL, NULL, NULL, NULL, NULL}
+};
+
+static void devctxt_dealloc(DevCtxtObject *self)
+{
+  if (self->pdctxt)
+    DC_release(self->pdctxt);
+  Py_TYPE(self)->tp_free((PyObject *)self);
+}
+
+static int devctxt_init(DevCtxtObject *self, PyObject *args, PyObject *kwds)
+{
+  static char *kwlist[] = { "type", NULL };
+  const char *type;
+  
+  if (!PyArg_ParseTupleAndKeywords(args, kwds, "$s", kwlist, &type))
+    return -1;
+  if (strcmp(type, "screen") == 0)
+  {
+    self->pdctxt = DC_CreateScreenContext();
+	if (!(self->pdctxt))
+    {
+	  PyErr_SetString(PyExc_RuntimeError, "unable to create screen context");
+	  return -1;
+	}
+  }
+  else if (strcmp(type, "memory") == 0)
+  {
+    self->pdctxt = _DC_CreateScreenCompatibleContext();
+	if (!(self->pdctxt))
+    {
+	  PyErr_SetString(PyExc_RuntimeError, "unable to create memory context");
+	  return -1;
+	}
+  }
+  else
+  {
+    PyErr_Format(PyExc_RuntimeError, "invalid type '%s'", type);
+	return -1;
+  }
+  return 0;
+}
+
+PyTypeObject DevCtxtType = {
+  PyVarObject_HEAD_INIT(NULL, 0)
+  .tp_name = "upiwin.DevCtxt",
+  .tp_doc = "Device context object",
+  .tp_basicsize = sizeof(DevCtxtObject),
+  .tp_itemsize = 0,
+  .tp_flags = Py_TPFLAGS_DEFAULT,
+  .tp_new = PyType_GenericNew,
+  .tp_init = (initproc)devctxt_init,
+  .tp_dealloc = (destructor)devctxt_dealloc,
+  .tp_methods = DevCtxtMethods,
+  .tp_getset = DevCtxtProperties,
+};
+
+HRESULT Epython_register_devctxt(PyObject *module)
+{
+  if (PyType_Ready(&DevCtxtType) < 0)
+	return E_FAIL;
+  Py_INCREF(&DevCtxtType);
+  if (PyModule_AddObject(module, "DevCtxt", (PyObject *)(&DevCtxtType)) < 0)
+  {
+    Py_DECREF(&DevCtxtType);
+	return E_FAIL;
+  }
+  return S_OK;
+}
--- a/src/ep_graphics.c
+++ b/src/ep_graphics.c
@ -0,0 +1,32 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#include "wintype.h"
+#include "gfxtype.h"
+
+PyObject *Epython_rgb(PyObject *self, PyObject *args)
+{
+  UINT32 r, g, b;
+  
+  if (!PyArg_ParseTuple(args, "kkk", &r, &g, &b))
+    return NULL;
+  return PyLong_FromUnsignedLong(RGB(r, g, b));
+}
--- a/src/ep_init.c
+++ b/src/ep_init.c
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #include <stdio.h>
 #include <string.h>
 #include <alloca.h>
--- a/src/ep_init.h
+++ b/src/ep_init.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __EP_INIT_H_INCLUDED
 #define __EP_INIT_H_INCLUDED

@ -14,6 +33,9 @@ extern PyObject *UPIWIN_tmp_module;
 extern PyObject *Epython_init_upiwin_module(void);
 extern PyObject *Epython_init_upiwin_tmp_module(void);

+extern HRESULT Epython_register_devctxt(PyObject *module);
+extern HRESULT Epython_register_bitmap(PyObject *module);
+
 extern HRESULT Epython_setup(void);
 extern HRESULT Epython_run(void);

--- a/src/ep_msg.c
+++ b/src/ep_msg.c
@ -0,0 +1,90 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#include "scode.h"
+#include "log.h"
+#include "msg_queue.h"
+#include "sysinput.h"
+#include "ep_upiwin.h"
+#include "ep_init.h"
+
+static HRESULT convert_msg(PyObject *target, PMSG source)
+{
+  PyObject *attr;
+  
+  ASSERT(PyDict_CheckExact(target));
+  PyDict_Clear(target);
+  attr = PyLong_FromUnsignedLong(source->target);
+  if (!attr)
+    return E_FAIL;
+  if (PyDict_SetItemString(target, "target", attr))
+	return E_FAIL;
+  attr = PyLong_FromUnsignedLong(source->message);
+  if (!attr)
+    return E_FAIL;
+  if (PyDict_SetItemString(target, "message", attr))
+	return E_FAIL;
+  attr = Py_BuildValue("[k,k]", source->attrs[0], source->attrs[1]);
+  if (!attr)
+    return E_FAIL;
+  if (PyDict_SetItemString(target, "attrs", attr))
+	return E_FAIL;
+  attr = PyLong_FromUnsignedLongLong(source->timestamp);
+  if (!attr)
+    return E_FAIL;
+  if (PyDict_SetItemString(target, "timestamp", attr))
+	return E_FAIL;
+  return S_OK;
+}
+
+PyObject *Epython_get_message(PyObject *self, PyObject *args)
+{
+  PyObject *out;
+  MSG msg;
+  
+  if (!PyArg_ParseTuple(args, "O!", &PyDict_Type, &out))
+    return NULL;
+  
+  /* release the GIL to allow us to block waiting for input if necessary */
+  Py_BEGIN_ALLOW_THREADS
+  while (!Mq_peek(Sys_Queue, &msg, PEEK_REMOVE))
+    Sys_wait_for_input();
+  Py_END_ALLOW_THREADS
+  
+  if (FAILED(convert_msg(out, &msg)))
+  {
+    PyErr_SetString(PyExc_RuntimeError, "could not convert received message");
+	return NULL;
+  }
+  return PyBool_FromLong(msg.message != WM_QUIT);
+}
+
+PyObject *Epython_post_quit_message(PyObject *self, PyObject *args)
+{
+  INT32 exitcode;
+  
+  if (!PyArg_ParseTuple(args, "i", &exitcode))
+    return NULL;
+  Sys_Exit_Code = exitcode;
+  Mq_post1(Sys_Queue, 0, WM_QUIT, exitcode);
+  Py_RETURN_NONE;
+}
+
--- a/src/ep_types.h
+++ b/src/ep_types.h
@ -0,0 +1,47 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#ifndef __EP_TYPES_H_INCLUDED
+#define __EP_TYPES_H_INCLUDED
+
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#include "wintype.h"
+#include "gfxtype.h"
+#include "gfxobj.h"
+#include "devctxt.h"
+#include "bitmap.h"
+
+typedef struct tagBitmapObject {
+  PyObject_HEAD
+  PBITMAP pbmp;
+} BitmapObject;
+
+typedef struct tagDevCtxtObject {
+  PyObject_HEAD
+  PDCTXT pdctxt;
+  BitmapObject *selected_bitmap;
+} DevCtxtObject;
+
+extern PyTypeObject DevCtxtType;
+extern PyTypeObject BitmapType;
+
+extern PyObject *Epython_wrap_bitmap(PBITMAP pbmp);
+
+#endif /* __EP_TYPES_H_INCLUDED */
--- a/src/ep_upiwin.c
+++ b/src/ep_upiwin.c
@ -1,9 +1,31 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "scode.h"
-#include "ep_init.h"
+#include "msg.h"
 #include "gpio.h"
+#include "ep_init.h"
 #include "ep_upiwin.h"
+#include "ep_util.h"
+#include "devctxt.h"

 static PyMethodDef UPIWINMethods[] = {
  /* Backlight control functions */
@ -15,6 +37,14 @@ static PyMethodDef UPIWINMethods[] = {
   "Returns the current intensity level of the backlight."},
  {"set_backlight_level", Epython_set_backlight_level, METH_VARARGS,
   "Sets the current intensity level of the backlight. Returns a SCODE."},
+  /* Message functions */
+  {"get_message", Epython_get_message, METH_VARARGS,
+   "Retrieves a message from the message queue, blocking if necessary."},
+  {"post_quit_message", Epython_post_quit_message, METH_VARARGS,
+   "Posts a WM_QUIT message to the message queue, with an exit code."},
+  /* Graphics functions */
+  {"rgb", Epython_rgb, METH_VARARGS,
+   "Creates a color value from separate red, green, and blue indexes."},
  {NULL, NULL, 0, NULL}
 };

@ -30,6 +60,36 @@ static PyModuleDef DefUPIWIN = {
  NULL                       /* no free function */
 };

+BEGIN_CONSTANT_TABLE(UPIWINConstants)
+  /* Message constants */
+  CONSTANT_INT_MACRO(WM_NULL)
+  CONSTANT_INT_MACRO(WM_QUIT)
+  CONSTANT_INT_MACRO(WM_HWBUTTONDOWN)
+  CONSTANT_INT_MACRO(WM_HWBUTTONUP)
+  CONSTANT_INT_MACRO(WM_HWBUTTONCLICK)
+  CONSTANT_INT_MACRO(WM_TOUCHDOWN)
+  CONSTANT_INT_MACRO(WM_TOUCHMOVE)
+  CONSTANT_INT_MACRO(WM_TOUCHUP)
+  CONSTANT_INT_MACRO(WM_TOUCHCLICK)
+  /* Raster op constants */
+  CONSTANT_INT_MACRO(R2_BLACK)
+  CONSTANT_INT_MACRO(R2_NOTMERGEPEN)
+  CONSTANT_INT_MACRO(R2_MASKNOTPEN)
+  CONSTANT_INT_MACRO(R2_NOTCOPYPEN)
+  CONSTANT_INT_MACRO(R2_MASKPENNOT)
+  CONSTANT_INT_MACRO(R2_NOT)
+  CONSTANT_INT_MACRO(R2_XORPEN)
+  CONSTANT_INT_MACRO(R2_NOTMASKPEN)
+  CONSTANT_INT_MACRO(R2_MASKPEN)
+  CONSTANT_INT_MACRO(R2_NOTXORPEN)
+  CONSTANT_INT_MACRO(R2_NOP)
+  CONSTANT_INT_MACRO(R2_MERGENOTPEN)
+  CONSTANT_INT_MACRO(R2_COPYPEN)
+  CONSTANT_INT_MACRO(R2_MERGEPENNOT)
+  CONSTANT_INT_MACRO(R2_MERGEPEN)
+  CONSTANT_INT_MACRO(R2_WHITE)
+END_CONSTANT_TABLE
+
 PyObject *Epython_init_upiwin_module(void)
 {
  PyObject *module;
@ -38,6 +98,24 @@ PyObject *Epython_init_upiwin_module(void)
  module = PyModule_Create(&DefUPIWIN);
  if (!module)
    return NULL;
+	
+  if (FAILED(Epython_register_constants(module, UPIWINConstants)))
+  {
+	Py_DECREF(module);
+	return NULL;
+  }
+  
+  if (FAILED(Epython_register_bitmap(module)))
+  {
+    Py_DECREF(module);
+	return NULL;
+  }
+  
+  if (FAILED(Epython_register_devctxt(module)))
+  {
+	Py_DECREF(module);
+	return NULL;
+  }

  /* set up the module state */
  pstate = (PUPIWIN_STATE)PyModule_GetState(module);
--- a/src/ep_upiwin.h
+++ b/src/ep_upiwin.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __EP_UPIWIN_H_INCLUDED
 #define __EP_UPIWIN_H_INCLUDED

@ -11,9 +30,18 @@ typedef struct tagUPIWIN_STATE {
 } UPIWIN_STATE, *PUPIWIN_STATE;

 /* method definitions go here */
+
+/* ep_backlight.c */
 extern PyObject *Epython_get_backlight(PyObject *self, PyObject *args);
 extern PyObject *Epython_set_backlight(PyObject *self, PyObject *args);
 extern PyObject *Epython_get_backlight_level(PyObject *self, PyObject *args);
 extern PyObject *Epython_set_backlight_level(PyObject *self, PyObject *args);

+/* ep_msg.c */
+extern PyObject *Epython_get_message(PyObject *self, PyObject *args);
+extern PyObject *Epython_post_quit_message(PyObject *self, PyObject *args);
+
+/* ep_graphics.c */
+extern PyObject *Epython_rgb(PyObject *self, PyObject *args);
+
 #endif /* __EP_UPIWIN_H_INCLUDED */
--- a/src/ep_upiwin_tmp.c
+++ b/src/ep_upiwin_tmp.c
@ -1,8 +1,28 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "scode.h"
 #include "fbprimitive.h"
 #include "ep_init.h"
+#include "ep_util.h"

 static PyObject *do_setpixel(PyObject *self, PyObject *args)
 {
@ -84,10 +104,30 @@ static PyModuleDef DefUPIWIN_tmp = {
  NULL                     /* no free function */
 };

+BEGIN_CONSTANT_TABLE(UPIWIN_tmpConstants)
+  /* primitive color values */
+  CONSTANT_INT_MACRO(FBPRIMCLR_BLACK)
+  CONSTANT_INT_MACRO(FBPRIMCLR_RED)
+  CONSTANT_INT_MACRO(FBPRIMCLR_GREEN)
+  CONSTANT_INT_MACRO(FBPRIMCLR_BLUE)
+  CONSTANT_INT_MACRO(FBPRIMCLR_YELLOW)
+  CONSTANT_INT_MACRO(FBPRIMCLR_CYAN)
+  CONSTANT_INT_MACRO(FBPRIMCLR_MAGENTA)
+  CONSTANT_INT_MACRO(FBPRIMCLR_WHITE)
+END_CONSTANT_TABLE
+
 PyObject *Epython_init_upiwin_tmp_module(void)
 {
  PyObject *module;
  
  module = PyModule_Create(&DefUPIWIN_tmp);
+  if (module)
+  {
+	if (FAILED(Epython_register_constants(module, UPIWIN_tmpConstants)))
+	{
+	  Py_DECREF(module);
+	  module = NULL;
+	}
+  }
  return module;
 }
--- a/src/ep_util.c
+++ b/src/ep_util.c
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "scode.h"
@ -42,3 +61,34 @@ HRESULT Epython_trace_exception(void)
  Py_DECREF(traceback);
  return hr;
 }
+
+HRESULT Epython_register_constants(PyObject *module, PCREGCONSTANT const_table)
+{
+  HRESULT hr = S_OK;
+  int i = 0, rc;
+  
+  while (const_table[i].name)
+  {
+    switch (const_table[i].regtype)
+	{
+	  case 'i':
+		rc = PyModule_AddIntConstant(module, const_table[i].name, const_table[i].value.ival);
+		break;
+	  case 's':
+		rc = PyModule_AddStringConstant(module, const_table[i].name, const_table[i].value.sval);
+		break;
+	  default:
+	    Log(LERROR, "register_constants type '%c' unknown", const_table[i].regtype);
+	    return E_UNEXPECTED;
+	}
+	if (rc)
+	{
+	  Log(LERROR, "Failed to register constant %s", const_table[i].name);
+	  hr = E_FAIL;
+	  break;
+	}
+	++i;
+  }
+  
+  return hr;
+}
--- a/src/ep_util.h
+++ b/src/ep_util.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __EP_UTIL_H_INCLUDED
 #define __EP_UTIL_H_INCLUDED

@ -5,7 +24,26 @@
 #include <Python.h>
 #include "wintype.h"

+typedef struct tagREGCONSTANT {
+	CHAR regtype;
+	PCSTR name;
+	union {
+		LONG ival;
+		PCSTR sval;
+	} value;
+} REGCONSTANT, *PREGCONSTANT;
+
+typedef const REGCONSTANT *PCREGCONSTANT;
+
 extern void Epython_log_object(int level, const char *label, PyObject *object);
 extern HRESULT Epython_trace_exception(void);
+extern HRESULT Epython_register_constants(PyObject *module, PCREGCONSTANT const_table);
+
+#define BEGIN_CONSTANT_TABLE(name)    static const REGCONSTANT name[] = {
+#define CONSTANT_INT(name, value)     { 'i', name, { .ival = value } },
+#define CONSTANT_INT_MACRO(mac)       CONSTANT_INT(#mac, mac)
+#define CONSTANT_STRING(name, value)  { 's', name, { .sval = value } },
+#define CONSTANT_STRING_MACRO(mac)    CONSTANT_STRING(#mac, mac)
+#define END_CONSTANT_TABLE            { 0, NULL, { .sval = NULL } } };

 #endif /* __EP_UTIL_H_INCLUDED */
--- a/src/fbinit.c
+++ b/src/fbinit.c
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #include <stddef.h>
 #include <string.h>
 #include <fcntl.h>
--- a/src/fbinit.h
+++ b/src/fbinit.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __FBINIT_H_INCLUDED
 #define __FBINIT_H_INCLUDED

--- a/src/fbprimitive.c
+++ b/src/fbprimitive.c
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #include <string.h>
 #include <alloca.h>
 #include "wintype.h"
--- a/src/fbprimitive.h
+++ b/src/fbprimitive.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __FBPRIMITIVE_H_INCLUDED
 #define __FBPRIMITIVE_H_INCLUDED

--- a/src/fontengine.c
+++ b/src/fontengine.c
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #include <ft2build.h>
 #include FT_FREETYPE_H
 #include "scode.h"
--- a/src/fontengine.h
+++ b/src/fontengine.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __FONTENGINE_H_INCLUDED
 #define __FONTENGINE_H_INCLUDED

--- a/src/gfxobj.c
+++ b/src/gfxobj.c
@ -0,0 +1,58 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#include <stdlib.h>
+#include <string.h>
+#include "gfxobj.h"
+
+void _Go_init(PGFXOBJECT obj, UINT32 sig, UINT32 size)
+{
+  memset(obj, 0, sizeof(GFXOBJECT));
+  obj->sig = sig;
+  obj->size = size;
+  obj->refcnt = 1;
+}
+
+void Go_unchain(PGFXOBJECT obj)
+{
+  if (!(obj->next || obj->prev))
+	return;
+  if (obj->next)
+    obj->next->prev = obj->prev;
+  if (obj->prev)
+    obj->prev->next = obj->next;
+  obj->prev = obj->next = NULL;
+}
+
+INT32 Go_addref(PGFXOBJECT obj)
+{
+  return ++(obj->refcnt);
+}
+
+INT32 Go_release(PGFXOBJECT obj)
+{
+  int rc = --(obj->refcnt);
+  if (rc == 0)
+  {
+	if (obj->dtor)
+	  (*(obj->dtor))(obj);
+	free(obj);
+  }
+  return rc;
+}
--- a/src/gfxobj.h
+++ b/src/gfxobj.h
@ -0,0 +1,43 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#ifndef __GFXOBJ_H_INCLUDED
+#define __GFXOBJ_H_INCLUDED
+
+#include "wintype.h"
+
+/* type definition for a graphics destructor */
+typedef void (*GFX_DTOR)(PVOID obj);
+
+/* A graphics object in memory always starts with this. */
+typedef struct tagGFXOBJECT {
+  UINT32 sig;                 /* signature so we know what something is */
+  UINT32 size;                /* size of total allocated memory in block */
+  INT32 refcnt;               /* reference count */
+  GFX_DTOR dtor;              /* destructor function called when we're no longer needed */
+  struct tagGFXOBJECT *next;  /* support double linked lists of obejcts */
+  struct tagGFXOBJECT *prev;
+} GFXOBJECT, *PGFXOBJECT;
+
+extern void _Go_init(PGFXOBJECT obj, UINT32 sig, UINT32 size);
+extern void Go_unchain(PGFXOBJECT obj);
+extern INT32 Go_addref(PGFXOBJECT obj);
+extern INT32 Go_release(PGFXOBJECT obj);
+
+#endif /* __GFXOBJ_H_INCLUDED */
--- a/src/gfxtype.h
+++ b/src/gfxtype.h
@ -0,0 +1,59 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#ifndef __GFXTYPE_H_INCLUDED
+#define __GFXTYPE_H_INCLUDED
+
+#include "wintype.h"
+
+typedef struct tagPOINT {
+	INT32 x;
+	INT32 y;
+} POINT, *PPOINT;
+
+typedef struct tagRECT {
+	INT32 left;
+	INT32 top;
+	INT32 right;
+	INT32 bottom;
+} RECT, *PRECT;
+
+typedef const POINT *PCPOINT;
+typedef const RECT *PCRECT;
+
+typedef UINT32 COLORREF;
+typedef PUINT32 PCOLORREF;
+
+extern BOOL G_set_rect(PRECT rect, int left, int top, int right, int bottom);
+extern BOOL G_set_rect_empty(PRECT rect);
+extern BOOL G_inflate_rect(PRECT rect, int dx, int dy);
+extern BOOL G_offset_rect(PRECT rect, int dx, int dy);
+extern BOOL G_is_rect_empty(PCRECT rect);
+extern BOOL G_coords_in_rect(PCRECT rect, INT32 x, INT32 y);
+extern BOOL G_point_in_rect(PCRECT rect, PCPOINT pt);
+extern BOOL G_rect_equal(PCRECT rect1, PCRECT rect2);
+extern BOOL G_rect_intersect(PRECT dest, PCRECT src1, PCRECT src2);
+extern BOOL G_rect_union(PRECT dest, PCRECT src1, PCRECT src2);
+
+#define RGB(r, g, b)    ((((UINT32)(r)) & 0xFF) | ((((UINT32)(g)) & 0xFF) << 8) | ((((UINT32)(b)) & 0xFF) << 16))
+#define GetRValue(cr)   ((UINT32)((cr) & 0xFF))
+#define GetGValue(cr)   ((UINT32)(((cr) >> 8) & 0xFF))
+#define GetBValue(cr)   ((UINT32)(((cr) >> 16) & 0xFF))
+
+#endif /* __GFXTYPE_H_INCLUDED */
--- a/src/gpio.c
+++ b/src/gpio.c
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #include <stdint.h>
 #include <bcm2835.h>
 #include "config.h"
--- a/src/gpio.h
+++ b/src/gpio.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __GPIO_H_INCLUDED
 #define __GPIO_H_INCLUDED

--- a/src/log.c
+++ b/src/log.c
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #include <stdio.h>
 #include <stdarg.h>
 #include <time.h>
--- a/src/log.h
+++ b/src/log.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __LOG_H_INCLUDED
 #define __LOG_H_INCLUDED

--- a/src/main.c
+++ b/src/main.c
@ -1,27 +1,38 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include "scode.h"
+#include "log.h"
 #include "config.h"
 #include "gpio.h"
-#include "log.h"
 #include "fbinit.h"
-#include "fbprimitive.h"
 #include "fontengine.h"
 #include "time_func.h"
 #include "ep_init.h"
 #include "sysinput.h"

-static void log_touch(const char *event, UINT_PTR x, UINT_PTR y)
-{
-  Log(LINFO, "Touch %s at (%u, %u)", event, x, y);
-}
-
 int main(int argc, char *argv[])
 {
  HRESULT hr;
-  int running = 1;
-  MSG msg;

  /* initialization sequence */
  Time_init();
@ -47,54 +58,6 @@ int main(int argc, char *argv[])
  if (FAILED(Epython_run()))
    return EXIT_FAILURE;
 
-  Log(LINFO, "Script returned and event loop ready.");
-
-  while (running)
-  {
-    if (Mq_peek(Sys_Queue, &msg, PEEK_REMOVE))
-    {
-      switch (msg.message)
-      {
-	case WM_HWBUTTONDOWN:
-	  Log(LINFO, "Button %d was pressed.", (int)(msg.attrs[0]));
-	  break;
-
-	case WM_HWBUTTONUP:
-	  Log(LINFO, "Button %d was released.", (int)(msg.attrs[0]));
-	  if (msg.attrs[0] == 1)
-	  {
-	    Log(LINFO, "Backlight ON.");
-	    Gpio_set_backlight(GSB_BACKLIGHT_MAX);
-	  }
-	  if (msg.attrs[0] == 2)
-	  {
-	    Log(LINFO, "Backlight OFF.");
-	    Gpio_set_backlight(0);
-	  }
-	  if (msg.attrs[0] == 4)
-	  {
-	    Log(LINFO, "Quitting the message loop.");
-	    running = 0;
-	  }
-	  break;
-
-	case WM_TOUCHDOWN:
-	  log_touch("DOWN", msg.attrs[0], msg.attrs[1]);
-	  break;
-	  
-	case WM_TOUCHMOVE:
-	  log_touch("MOVE", msg.attrs[0], msg.attrs[1]);
-	  break;
-	  
-	case WM_TOUCHUP:
-	  log_touch("UP", msg.attrs[0], msg.attrs[1]);
-	  break;
-	  
-	default:
-	  break;
-      }
-    }
-  }
-  
-  return EXIT_SUCCESS;
+  Log(LINFO, "Script returned with exit code %d", Sys_Exit_Code);
+  return Sys_Exit_Code;
 }
--- a/src/msg.h
+++ b/src/msg.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __MSG_H_INCLUDED
 #define __MSG_H_INCLUDED

@ -13,12 +32,15 @@ typedef struct tagMSG {
 } MSG, *PMSG;

 #define WM_NULL           0x0000
+#define WM_QUIT           0x0001

 #define WM_HWBUTTONDOWN   0x0020
 #define WM_HWBUTTONUP     0x0021
+#define WM_HWBUTTONCLICK  0x0022

 #define WM_TOUCHDOWN      0x0030
 #define WM_TOUCHMOVE      0x0031
 #define WM_TOUCHUP        0x0032
+#define WM_TOUCHCLICK     0x0033

 #endif /* __MSG_H_INCLUDED */
--- a/src/msg_queue.c
+++ b/src/msg_queue.c
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #include <stdlib.h>
 #include <string.h>
 #include <pthread.h>
@ -93,3 +112,12 @@ BOOL Mq_peek(PMSG_QUEUE queue, PMSG msg, UINT32 flags)
  pthread_mutex_unlock(&(queue->mutex));
  return rc;
 }
+
+BOOL Mq_is_empty(PMSG_QUEUE queue)
+{
+  BOOL rc;
+  pthread_mutex_lock(&(queue->mutex));
+  rc = (queue->head == queue->tail);
+  pthread_mutex_unlock(&(queue->mutex));
+  return rc;
+}
--- a/src/msg_queue.h
+++ b/src/msg_queue.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __MSG_QUEUE_H_INCLUDED
 #define __MSG_QUEUE_H_INCLUDED

@ -26,6 +45,7 @@ extern void Mq_destroy(PMSG_QUEUE queue);
 extern void Mq_post(PMSG_QUEUE queue, HANDLE target, UINT32 message, const UINT_PTR *attrs, int nattrs);
 extern void Mq_post2(PMSG_QUEUE queue, HANDLE target, UINT32 message, UINT_PTR attr1, UINT_PTR attr2);
 extern BOOL Mq_peek(PMSG_QUEUE queue, PMSG msg, UINT32 flags);
+extern BOOL Mq_is_empty(PMSG_QUEUE queue);

 #define Mq_post0(q, tgt, msg)         Mq_post2(q, tgt, msg, 0, 0)
 #define Mq_post1(q, tgt, msg, attr)   Mq_post2(q, tgt, msg, attr, 0)
--- a/src/rect.c
+++ b/src/rect.c
@ -0,0 +1,115 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#include <string.h>
+#include "log.h"
+#include "gfxtype.h"
+
+BOOL G_set_rect(PRECT rect, int left, int top, int right, int bottom)
+{
+	rect->left = left;
+	rect->top = top;
+	rect->right = right;
+	rect->bottom = bottom;
+	return TRUE;
+}
+
+BOOL G_set_rect_empty(PRECT rect)
+{
+	memset(rect, 0, sizeof(RECT));
+	return TRUE;
+}
+
+BOOL G_inflate_rect(PRECT rect, int dx, int dy)
+{
+	rect->left += dx;
+	rect->top += dy;
+	rect->right -= dx;
+	rect->bottom -= dy;
+	return TRUE;
+}
+
+BOOL G_offset_rect(PRECT rect, int dx, int dy)
+{
+	rect->left += dx;
+	rect->top += dy;
+	rect->right += dx;
+	rect->bottom += dy;
+	return TRUE;
+}
+
+BOOL G_is_rect_empty(PCRECT rect)
+{
+	return (rect->right <= rect->left) || (rect->bottom <= rect->top);
+}
+
+BOOL G_coords_in_rect(PCRECT rect, INT32 x, INT32 y)
+{
+	return (rect->left <= x) && (x < rect->right) && (rect->top <= y) && (y < rect->bottom);
+}
+
+BOOL G_point_in_rect(PCRECT rect, PCPOINT pt)
+{
+	return G_coords_in_rect(rect, pt->x, pt->y);
+}
+
+BOOL G_rect_equal(PCRECT rect1, PCRECT rect2)
+{
+	return (memcmp(rect1, rect2, sizeof(RECT)) == 0);
+}
+
+BOOL G_rect_intersect(PRECT dest, PCRECT src1, PCRECT src2)
+{
+	if (G_is_rect_empty(src1) || G_is_rect_empty(src2))
+	{
+		memset(dest, 0, sizeof(RECT));
+		return FALSE;
+	}
+	if ((src1->left >= src2->right) || (src2->left >= src1->right) || (src1->top >= src2->bottom) || (src2->top >= src1->bottom))
+	{
+		memset(dest, 0, sizeof(RECT));
+		return FALSE;
+	}
+	dest->left = MAX(src1->left, src2->left);
+	dest->top = MAX(src1->top, src2->top);
+	dest->right = MIN(src1->right, src2->right);
+	dest->bottom = MIN(src1->bottom, src2->bottom);
+	ASSERT(dest->left <= dest->right);
+	ASSERT(dest->top <= dest->bottom);
+	return TRUE;
+}
+
+BOOL G_rect_union(PRECT dest, PCRECT src1, PCRECT src2)
+{
+	if (G_is_rect_empty(src1))
+	{
+		memcpy(dest, src2, sizeof(RECT));
+		return !G_is_rect_empty(src2);
+	}
+	else if (G_is_rect_empty(src2))
+	{
+		memcpy(dest, src1, sizeof(RECT));
+		return TRUE;
+	}
+	dest->left = MIN(src1->left, src2->left);
+	dest->top = MIN(src1->top, src2->top);
+	dest->right = MAX(src1->right, src2->right);
+	dest->bottom = MAX(src1->bottom, src2->bottom);
+	return TRUE;
+}
--- a/src/scode.h
+++ b/src/scode.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __SCODE_H_INCLUDED
 #define __SCODE_H_INCLUDED

--- a/src/stockobj.c
+++ b/src/stockobj.c
@ -0,0 +1,75 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
+#include <stddef.h>
+#include <string.h>
+#include "wintype.h"
+#include "bitmap.h"
+
+/* references to the icon data */
+extern uint8_t _binary_i_freehand_bin_start[];
+extern uint8_t _binary_i_freehand_bin_end;
+extern uint8_t _binary_i_freehand_bin_size;
+
+extern uint8_t _binary_i_line_bin_start[];
+extern uint8_t _binary_i_line_bin_end;
+extern uint8_t _binary_i_line_bin_size;
+
+extern uint8_t _binary_i_rect_bin_start[];
+extern uint8_t _binary_i_rect_bin_end;
+extern uint8_t _binary_i_rect_bin_size;
+
+extern uint8_t _binary_i_fillrect_bin_start[];
+extern uint8_t _binary_i_fillrect_bin_end;
+extern uint8_t _binary_i_fillrect_bin_size;
+
+extern uint8_t _binary_i_undo_bin_start[];
+extern uint8_t _binary_i_undo_bin_end;
+extern uint8_t _binary_i_undo_bin_size;
+
+extern uint8_t _binary_i_clear_bin_start[];
+extern uint8_t _binary_i_clear_bin_end;
+extern uint8_t _binary_i_clear_bin_size;
+
+typedef struct tagSTOCKBITMAPDESC {
+  PCSTR name;
+  INT32 width;
+  INT32 height;
+  const void *data;
+} STOCKBITMAPDESC;
+
+static const STOCKBITMAPDESC stock_bitmaps[] = {
+  {"freehand", 48, 48, _binary_i_freehand_bin_start },
+  {"line", 48, 48, _binary_i_line_bin_start },
+  {"rect", 48, 48, _binary_i_rect_bin_start },
+  {"fillrect", 48, 48, _binary_i_fillrect_bin_start },
+  {"undo", 48, 48, _binary_i_undo_bin_start },
+  {"clear", 48, 48, _binary_i_clear_bin_start },
+  {NULL, 0, 0, NULL }
+};
+
+PBITMAP _BMP_GetStock(PCSTR name)
+{
+  INT32 i;
+  
+  for (i = 0; stock_bitmaps[i].name; ++i)
+    if (strcmp(name, stock_bitmaps[i].name) == 0)
+	  return BMP_Create(stock_bitmaps[i].width, stock_bitmaps[i].height, stock_bitmaps[i].data);
+  return NULL;
+}
--- a/src/sysinput.c
+++ b/src/sysinput.c
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #include <stddef.h>
 #include <signal.h>
 #include <string.h>
@ -11,27 +30,36 @@
 #include "log.h"
 #include "msg_queue.h"
 #include "gpio.h"
+#include "fbinit.h"
 #include "time_func.h"

 #define INPUT_EVENT_BATCH 16   /* number of events to retrieve from touchscreen at once */

 PMSG_QUEUE Sys_Queue = NULL;   /* system message queue */
+INT32 Sys_Exit_Code = -1;      /* system exit code, set on WM_QUIT */
 static int ts_fd = 0;          /* file descriptor for touchscreen */

 static pthread_t ithread;                    /* input thread handle */
 static volatile sig_atomic_t running = 1;    /* "running" flag for input thread */

+static pthread_mutex_t wait_mutex = PTHREAD_MUTEX_INITIALIZER;  /* mutex for waiting on input */
+static pthread_cond_t wait_cond = PTHREAD_COND_INITIALIZER;     /* condition for waiting on input */
+
 /* Local data for poll_buttons() */
 static UINT32 last_bstate = 0;                        /* previous button state */
 static TIMESTAMP button_event_ok[GPIO_BUTTON_COUNT];  /* timestamps to debounce events */
+static TIMESTAMP button_down_time[GPIO_BUTTON_COUNT];  /* timestamps for click detection */

 /* Local data for poll_touchscreen() */
 static UINT_PTR touch_x = 0;                  /* X coordinate to send with next message */
 static UINT_PTR touch_y = 0;                  /* Y coordinate to send with next message */
 static UINT32 touch_nextmsg = WM_TOUCHMOVE;   /* identifier of next message to send */
+static UINT_PTR touch_down_x, touch_down_y;   /* location of the touch-down event for click detection */
+static TIMESTAMP touch_down_time;             /* timestamp for click detection */

-static void poll_buttons(void)
+static BOOL poll_buttons(void)
 {
+  BOOL posted = FALSE;
  UINT32 st, down, up, mask;
  UINT_PTR attr;
  TIMESTAMP now;
@ -46,23 +74,33 @@ static void poll_buttons(void)
    for (attr = 1, mask = GRB_STATE_BUTTON1; attr <= GPIO_BUTTON_COUNT; attr++, mask <<= 1)
    {
      if (now < button_event_ok[attr - 1])
-	continue;  /* this is a "contact bounce" event, don't bother */
+		continue;  /* this is a "contact bounce" event, don't bother */
      if (up & mask)
      {
-	/* reset contact bounce timer - only seems to happen after button releases */
-	button_event_ok[attr - 1] = now + Gconfig.button_debounce;
-	Mq_post1(Sys_Queue, 0, WM_HWBUTTONUP, attr);
+		/* reset contact bounce timer - only seems to happen after button releases */
+		button_event_ok[attr - 1] = now + Gconfig.button_debounce;
+		Mq_post1(Sys_Queue, 0, WM_HWBUTTONUP, attr);
+		if ((now - button_down_time[attr - 1]) <= Gconfig.click_time)
+		  Mq_post1(Sys_Queue, 0, WM_HWBUTTONCLICK, attr);
+		posted = TRUE;
      }
      else if (down & mask)
-	Mq_post1(Sys_Queue, 0, WM_HWBUTTONDOWN, attr);
+	  {
+		Mq_post1(Sys_Queue, 0, WM_HWBUTTONDOWN, attr);
+		button_down_time[attr - 1] = now;
+		posted = TRUE;
+	  }
    }
    last_bstate = st;
  }
+  return posted;
 }

-static void poll_touchscreen(void)
+static BOOL poll_touchscreen(void)
 {
+  BOOL posted = FALSE;
  int nb, nev, xerrno, i;
+  TIMESTAMP now;
  struct input_event buffer[INPUT_EVENT_BATCH];

  nb = read(ts_fd, buffer, INPUT_EVENT_BATCH * sizeof(struct input_event));
@ -71,12 +109,12 @@ static void poll_touchscreen(void)
    xerrno = errno;
    if ((xerrno != EAGAIN) && (xerrno != EWOULDBLOCK))
      Log(LERROR, "Error reading from touchscreen device (%d)", xerrno);
-    return;
+    return FALSE;
  }
  else if (nb == 0)
  {
    Log(LERROR, "Unexpected end of file reading from touchscreen device");
-    return;
+    return FALSE;
  }
  
  nev = nb / sizeof(struct input_event);
@ -89,33 +127,53 @@ static void poll_touchscreen(void)
    switch (buffer[i].type)
    {
      case EV_SYN:
-	if (buffer[i].code == SYN_REPORT)
-	{
-	  Mq_post2(Sys_Queue, 0, touch_nextmsg, touch_x, touch_y);
-	  touch_nextmsg = WM_TOUCHMOVE;
-	}
-	break;
+		if (buffer[i].code == SYN_REPORT)
+		{
+		  now = Time_since_start();
+		  Mq_post2(Sys_Queue, 0, touch_nextmsg, touch_x, touch_y);
+		  if (touch_nextmsg == WM_TOUCHDOWN)
+		  {
+		    touch_down_x = touch_x;
+			touch_down_y = touch_y;
+			touch_down_time = now;
+		  }
+		  else if (touch_nextmsg == WM_TOUCHUP)
+		  {
+		    if (   ((now - touch_down_time) <= Gconfig.click_time)
+		        && (ABS((INT32)touch_x - (INT32)touch_down_x) <= Gconfig.click_radius)
+			    && (ABS((INT32)touch_y - (INT32)touch_down_y) <= Gconfig.click_radius))
+			  Mq_post2(Sys_Queue, 0, WM_TOUCHCLICK, touch_x, touch_y);
+		  }
+	      touch_nextmsg = WM_TOUCHMOVE;
+	      posted = TRUE;
+		}
+		break;
 	
      case EV_ABS:
-	if (buffer[i].code == ABS_X)
-	  touch_x = buffer[i].value;
-	else if (buffer[i].code == ABS_Y)
-	  touch_y = buffer[i].value;
-	break;
+	    /* Note that the touchscreen driver assumes the screen is "vertical," so swap the x and y axes */
+		/* Also it thinks origin is lower left with up = +y */
+		if (buffer[i].code == ABS_X)
+		  touch_y = Fb_Info->height - buffer[i].value;
+		else if (buffer[i].code == ABS_Y)
+		  touch_x = buffer[i].value;
+		break;
 	
      case EV_KEY:
-	if (buffer[i].code == BTN_TOUCH)
-	  touch_nextmsg = (buffer[i].value ? WM_TOUCHDOWN : WM_TOUCHUP);
-	break;
+		if (buffer[i].code == BTN_TOUCH)
+		  touch_nextmsg = (buffer[i].value ? WM_TOUCHDOWN : WM_TOUCHUP);
+		break;
 	
      default:
-	break;
+		break;
    }
  }
+  return posted;
 }

 static void *input_thread(void *arg)
 {
+  BOOL gotinput;
+  
  /* clear all state at startup */
  last_bstate = 0;
  memset(button_event_ok, 0, GPIO_BUTTON_COUNT * sizeof(TIMESTAMP));
@ -124,8 +182,14 @@ static void *input_thread(void *arg)
  
  while (running)
  {
-    poll_buttons();
-    poll_touchscreen();
+	gotinput = poll_buttons();
+    gotinput = poll_touchscreen() || gotinput;
+	if (gotinput)
+	{
+	  pthread_mutex_lock(&wait_mutex);
+	  pthread_cond_signal(&wait_cond);
+	  pthread_mutex_unlock(&wait_mutex);
+	}
  }
  return NULL;
 }
@ -156,9 +220,8 @@ HRESULT Sys_enable_input(void)
  if (ts_fd < 0)
  {
    rc = ERRNO_AS_SCODE;
-    Mq_destroy(Sys_Queue);
    Log(LFATAL, "Unable to open touchscreen device %s (%08X).", Gconfig.touchscreen_device, rc);
-    return rc;
+    goto error_0;
  }
  
  running = 1;
@ -166,16 +229,27 @@ HRESULT Sys_enable_input(void)
  if (threadrc != 0)
  {
    rc = SCODE_FROM_ERRNO(threadrc);
-    close(ts_fd);
-    ts_fd = -1;
-    Mq_destroy(Sys_Queue);
    Log(LFATAL, "Unable to start system input thread (%08X).", rc);
+	goto error_1;
  }
-  if (SUCCEEDED(rc))
-  {
-    rc = Config_exitfunc(do_disable_input);
-    if (FAILED(rc))
-      do_disable_input();
-  }
+  
+  rc = Config_exitfunc(do_disable_input);
+  if (FAILED(rc))
+	do_disable_input();
+  return rc;
+
+error_1:  
+  close(ts_fd);
+  ts_fd = -1;
+error_0:
+  Mq_destroy(Sys_Queue);
  return rc;
 }
+
+void Sys_wait_for_input(void)
+{
+  pthread_mutex_lock(&wait_mutex);
+  while (Mq_is_empty(Sys_Queue))
+	pthread_cond_wait(&wait_cond, &wait_mutex);
+  pthread_mutex_unlock(&wait_mutex);
+}
--- a/src/sysinput.h
+++ b/src/sysinput.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __SYSINPUT_H_INCLUDED
 #define __SYSINPUT_H_INCLUDED

@ -5,7 +24,9 @@
 #include "msg_queue.h"

 extern PMSG_QUEUE Sys_Queue;
+extern INT32 Sys_Exit_Code;

 extern HRESULT Sys_enable_input(void);
+extern void Sys_wait_for_input(void);

 #endif /* __SYSINPUT_H_INCLUDED */
--- a/src/time_func.c
+++ b/src/time_func.c
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #include <stddef.h>
 #include <sys/time.h>
 #include "time_func.h"
--- a/src/time_func.h
+++ b/src/time_func.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __TIMEFUNC_H_INCLUDED
 #define __TIMEFUNC_H_INCLUDED

--- a/src/wintype.h
+++ b/src/wintype.h
@ -1,3 +1,22 @@
+/*
+ * UPIWIN - Micro Pi Windowing Framework Kernel
+ * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
+ *    
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *    
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *-------------------------------------------------------------------------
+ */
 #ifndef __WINTYPE_H_INCLUDED
 #define __WINTYPE_H_INCLUDED