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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