atirage: Support non-32bpp rectangle fills#189
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`ATIRage::fill_rect` warned about non-ARGB8888 pixel formats but still continued through the 32bpp write loop. Observed when I got an ASan violation about an out-of-bounds write (of the 2MB VRAM when trying to boot the Mac OS X 10.0 Public Beta on the Beige G3 - at some point it switches the framebuffer to RGB555). Also adds some named enum values for the pixel formats to make things a bit more self-documenting.
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ATIRage::fill_rectwarned about non-ARGB8888 pixel formats but still continued through the 32bpp write loop. Observed when I got an ASan violation about an out-of-bounds write (of the 2MB VRAM when trying to boot the Mac OS X 10.0 Public Beta on the Beige G3 - at some point it switches the framebuffer to RGB555).Also adds some named enum values for the pixel formats to make things a bit more self-documenting.