[Alephmodular-devel] AlephModular and CoreGraphics update

[Br'fin <br...@ma...>]

I managed to implement text and bitmap display in CoreGraphics after  
a little bit of work.

Text caches ATSU style information for current font, style, and size,  
thanks to a CFontSpecRepository class I had concepted to help SDL and  
OpenGL but which went unused during Carbon code.

Bitmaps of 16 or 32 bits in depth are wrapped in a CGImageRef and  
CGContextDrawImage is used to draw them into the back buffer. For the  
indexed color bitmaps that are handled all over the HUD, I was able  
to provide a serial CGDataProvider to return the 16bit/32bit pixel  
colors for the indexed colors.

I suppose bitmaps could be directly blitted by ourselves and a bit  
more work, but it's unclear if that's the best option, with some  
notes around that wrapping bitmaps in CGImageRefs and using  
CGContextDrawImage may result in speed improvements over raw blitting  
due to optimized paths the OS may be able to setup in the transition  
from main memory to VRAM.

At any rate, AlephModular in CoreGraphics (AM-CG) on my machine runs  
full screen, and approximately the same FPS as the Quickdraw based  
version. AM-CG is also really raw whenever dialog boxes are used.  
They show up and overwrite the main image, and in addition, they may  
be missing functionality. For instance, pop-up menus are invisible  
due to the window shielding levels.

-Jeremy Parsons
http://alephmodular.sourceforge.net/