Trying to make Pico work after Surface driver addition.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11302 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

README.Pico.txt

@@ -0,0 +1,72 @@
+
+This documentation will explain how to quickly port FLTK to a new
+platform using the Pico driver system. For now, only the sample 
+SDL Pico driver on OS X compiles and barely runs.
+
+cmake -G Xcode -d OPTION_APPLE_SDL=ON ...
+
+tl;dr - the recent commit should be transparent to all developers 
+on other platforms. On OS X, the CMake setup add the option OPTION_APPLE_SDL=ON 
+that will run FLTK on top of SDL, which in turn runs on top of the 
+new "Pico" driver set.
+
+The greatest help I can get form the core developers is to continue 
+to refactor the platform specific functionalities into the drivers.
+
+---
+
+OK, long version. I know that I am repeating myself and I don't expect 
+those of you who "got it" weeks ago to read this again. Writing this 
+down is also for me to avoid losing track ;-)
+
+Goal 1: find all the stuff that must still go into drivers
+Goal 2: have a base driver for all future porting efforts
+Goal 3: make porting fun with early gratification to the coder
+Goal 4: extensively document a sample port (SDL), and how to improve it
+Goal 5: use SDL as a base library, thereby porting FLTK to iOS and Android
+
+
+This is the start of a new driver, named "Pico". "Pico" is here to 
+implement what I called the minimal driver.
+
+"Pico" implements (eventually) a complete set of drivers. The drivers 
+will be limited in functionality, but they will be good enough to 
+allow basic UI's with most FLTK widget types. 
+
+If "Pico" compiles without any "USE_PICO" or similar defines, we 
+have reached goal 1.
+
+"Pico" will implement all driver functionalities "in good faith", 
+meaning, in a way that FLTK runs without crashing. Only very very 
+basic functions are not implemented. A driver that derives form "Pico" 
+needs only to implement those missing functions, thereby reaching goals 
+2 and 3. As far as I can tell, those will be:
+
+- open a single fixed size window
+- setting a pixel in a color inside that window
+- polling and waiting for PUSH and RELEASE events an their position
+
+By implementing these three simple functions in the SDL driver, 
+"test/hello" and quite a bunch of other tests will run (yes, they 
+will be slow, but the will work).
+
+This will give the person who is porting FLTK to their platform a 
+very early confirmation that their build setup is working and a 
+very early gratification, reaching goal 3.
+
+Obviously, SDL is much more powerful, and by the nature of the 
+virtual functions in the driver system, we can incrementally add 
+functionality to the SDL driver, and document this incremental 
+nature, reaching goal 4.
+
+If we do all this right, we have goal 5.
+
+If SDL is too big or complex for, say, Android, we can simply start 
+a new native Android driver set by implementing the three functions 
+mentioned above, and then go from there.
+
+
+- Matthias
+
+
+

src/CMakeLists.txt

@@ -211,25 +211,25 @@ elseif (USE_SDL)
     drivers/Pico/Fl_Pico_Window_Driver.cxx
     drivers/Pico/Fl_Pico_Graphics_Driver.cxx
     drivers/Pico/Fl_Pico_Copy_Surface.cxx
-    drivers/SDL/Fl_SDL_System_Driver.cxx
-    drivers/SDL/Fl_SDL_Screen_Driver.cxx
-    drivers/SDL/Fl_SDL_Window_Driver.cxx
-    drivers/SDL/Fl_SDL_Graphics_Driver.cxx
-    drivers/SDL/Fl_SDL_Copy_Surface.cxx
-    drivers/SDL/Fl_SDL_Image_Surface.cxx
+    drivers/PicoSDL/Fl_PicoSDL_System_Driver.cxx
+    drivers/PicoSDL/Fl_PicoSDL_Screen_Driver.cxx
+    drivers/PicoSDL/Fl_PicoSDL_Window_Driver.cxx
+    drivers/PicoSDL/Fl_PicoSDL_Graphics_Driver.cxx
+    drivers/PicoSDL/Fl_PicoSDL_Copy_Surface.cxx
+    drivers/PicoSDL/Fl_PicoSDL_Image_Surface.cxx
   )
   set(DRIVER_HEADER_FILES
     drivers/Pico/Fl_Pico_System_Driver.H
     drivers/Pico/Fl_Pico_Screen_Driver.H
     drivers/Pico/Fl_Pico_Window_Driver.H
     drivers/Pico/Fl_Pico_Graphics_Driver.H
     drivers/Pico/Fl_Pico_Copy_Surface.H
-    drivers/SDL/Fl_SDL_System_Driver.H
-    drivers/SDL/Fl_SDL_Screen_Driver.H
-    drivers/SDL/Fl_SDL_Window_Driver.H
-    drivers/SDL/Fl_SDL_Graphics_Driver.H
-    drivers/SDL/Fl_SDL_Copy_Surface.H
-    drivers/SDL/Fl_SDL_Image_Surface.H
+    drivers/PicoSDL/Fl_PicoSDL_System_Driver.H
+    drivers/PicoSDL/Fl_PicoSDL_Screen_Driver.H
+    drivers/PicoSDL/Fl_PicoSDL_Window_Driver.H
+    drivers/PicoSDL/Fl_PicoSDL_Graphics_Driver.H
+    drivers/PicoSDL/Fl_PicoSDL_Copy_Surface.H
+    drivers/PicoSDL/Fl_PicoSDL_Image_Surface.H
   )
 
 elseif (APPLE)