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Question: thanks. worked a treat. Sorry if it's a basic Q, but could you explain the Lice blit modes or point to a site that does?
Asked by olilarkin (144.32.156.x) on July 2 2012, 10:25am
Reply on July 2 2012, 2:25pm:
    Sure, I guess this should be in lice.h but isn't (note if alpha is non-1.0, it changes things too). The actual logic for these is in lice_combine.h.
    • LICE_BLIT_MODE_COPY: copies input to output -- if alpha is not 1.0, mixes accordingly
    • LICE_BLIT_MODE_ADD: sums input and output -- if alpha is not 1.0, output + alpha*input is used, so for subtraction you can use ADD with alpha of -1.0.
    • LICE_BLIT_MODE_DODGE: output = output/(1.0-input), more or less
    • LICE_BLIT_MODE_MUL: output = output*input
    • LICE_BLIT_MODE_OVERLAY and LICE_BLIT_MODE_HSVADJ: ok I need to go get coffee now. fail.
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