72 行
2.4 KiB
C++
72 行
2.4 KiB
C++
#pragma once
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namespace nall {
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inline auto image::impose(blend mode, u32 targetX, u32 targetY, image source, u32 sourceX, u32 sourceY, u32 sourceWidth, u32 sourceHeight) -> void {
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source.transform(_endian, _depth, _alpha.mask(), _red.mask(), _green.mask(), _blue.mask());
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for(u32 y = 0; y < sourceHeight; y++) {
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const u8* sp = source._data + source.pitch() * (sourceY + y) + source.stride() * sourceX;
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u8* dp = _data + pitch() * (targetY + y) + stride() * targetX;
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for(u32 x = 0; x < sourceWidth; x++) {
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u64 sourceColor = source.read(sp);
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u64 targetColor = read(dp);
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s64 sa = (sourceColor & _alpha.mask()) >> _alpha.shift();
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s64 sr = (sourceColor & _red.mask() ) >> _red.shift();
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s64 sg = (sourceColor & _green.mask()) >> _green.shift();
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s64 sb = (sourceColor & _blue.mask() ) >> _blue.shift();
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s64 da = (targetColor & _alpha.mask()) >> _alpha.shift();
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s64 dr = (targetColor & _red.mask() ) >> _red.shift();
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s64 dg = (targetColor & _green.mask()) >> _green.shift();
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s64 db = (targetColor & _blue.mask() ) >> _blue.shift();
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u64 a, r, g, b;
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switch(mode) {
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case blend::add:
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a = max(sa, da);
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r = min(_red.mask() >> _red.shift(), ((sr * sa) >> _alpha.depth()) + ((dr * da) >> _alpha.depth()));
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g = min(_green.mask() >> _green.shift(), ((sg * sa) >> _alpha.depth()) + ((dg * da) >> _alpha.depth()));
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b = min(_blue.mask() >> _blue.shift(), ((sb * sa) >> _alpha.depth()) + ((db * da) >> _alpha.depth()));
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break;
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case blend::sourceAlpha:
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a = max(sa, da);
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r = dr + (((sr - dr) * sa) >> _alpha.depth());
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g = dg + (((sg - dg) * sa) >> _alpha.depth());
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b = db + (((sb - db) * sa) >> _alpha.depth());
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break;
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case blend::sourceColor:
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a = sa;
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r = sr;
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g = sg;
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b = sb;
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break;
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case blend::targetAlpha:
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a = max(sa, da);
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r = sr + (((dr - sr) * da) >> _alpha.depth());
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g = sg + (((dg - sg) * da) >> _alpha.depth());
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b = sb + (((db - sb) * da) >> _alpha.depth());
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break;
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case blend::targetColor:
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a = da;
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r = dr;
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g = dg;
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b = db;
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break;
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}
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write(dp, (a << _alpha.shift()) | (r << _red.shift()) | (g << _green.shift()) | (b << _blue.shift()));
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sp += source.stride();
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dp += stride();
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}
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}
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}
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}
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