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- draw1: 6M for draw 0,0,100,100 no repl
- draw3: 4M for draw 0,0,100,100 no repl
- just read src, dst - 250k
- mask reading - 650k
- write dst - 100k
- alpha calculation - 3000k
- olddraw: 10M for draw 0, 0, 1000, 1000 no repl all ldepth 3
- 44M for draw 0, 0, 1000, 1000 src, mask ldepth 2 dst ldepth 3
- draw4: 160M for draw 0, 0, 1000, 1000 no repl all r8g8b8
- null loop: 10k
- src, dst reading: 13-15M each
- mask reading: 30M
- alpha calculation loop: 90M
- null alpha loop: 2M
- minimal loop control +20M
- alpha calculation with divides +190M
- alpha calculation wtih shifts +70M
- writeback: 11M
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