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Porter-Duff

DST:

[Da, Dc]

DST_ATOP:

[Sa, Sc×(1 - Da) + Dc×Sa]

DST_IN:

[Da×Sa, Dc×Sa]

DST_OUT:

[Da×(1 - Sa), Dc×(1 - Sa)]

DST_OVER:

[Sa + Da - Sa×Da, Sc×(1 - Da) + Dc]

SRC:

[Sa, Sc]

SRC_ATOP:

[Da, Sc×Da + Dc×(1 - Sa)]

SRC_IN

[Sa×Da, Sc×Da]

SRC_OUT:

[Sa×(1 - Da), Sc×(1 - Da)]

SRC_OVER:

[Sa + Da - Sa×Da, Sc + (1 - Sa)×Dc]

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Next: Logical Up: Math algorithms Previous: Arithmetic:   Contents   Index

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