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| mode out color out alpha | |
| -------------- -------------- ----------- | |
| layer/over: ( sc+(1-sa)*dc , sa+da-sa*da ) | |
| multiply: ( sc*dc , sa+da-sa*da ) | |
| screen: ( sa*da - (da-dc)*(sa-sc) , sa+da-sa*da ) | |
| lighten: ( max(sa*dc,sc*da) , sa+da-sa*da ) | |
| darken: ( min(sa*dc,sc*da) , sa+da-sa*da ) | |
| add: ( min(dc+sc,1) , min(sa+da,1) ) | |
| subtract: ( max(dc-sc,0) , min(sa+da,1) ) | |
| difference: ( abs(sa*dc-sc*da) , sa+da-sa*da ) | |
| invert: ( sa*(da-dc) , sa+da-sa*da ) | |
| overlay: ( dc < da/2.0 ? (2.0*sc*dc) : (sa*da - 2.0*(da-dc)*(sa-sc)) , sa+da-sa*da ) | |
| hardlight: ( sc < sa/2.0 ? (2.0*sc*dc) : (sa*da - 2.0*(da-dc)*(sa-sc)) , sa+da-sa*da ) | |
| sc = source color, sa = source alpha, dc = dest color, da = dest alpha |
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