2b07553aa1
Pick a letter at random. I wasn't checking that the destination values were not less than zero, which let you click at the top/left edges of the screen and therefore the carefree_alpha_blend_blit() would try to write to areas outside the framebuffer. I started to see "zalgol" pixels in the letters, so I'm guessing the pixel data is getting stored just above the framebuffer, which makes sense (because that's the order they appear in the source code and this is a simple system!) When you click at the top of the screen it was writing pixels in the font data, eh? Then when you click elsewhere on the screen you get extra pixels with your letterforms and it looks like Unicode Lovecraft puns. |
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| .. | ||
| font | ||
| GNUmakefile | ||
| graphics.h | ||
| xerblin.c | ||