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Merge_rectangle has met the wood chipper. Ref #2633

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Blake Thompson 2015-01-16 16:04:02 -06:00
parent a7b8ca2888
commit 0b2c4e57cf
1 changed files with 0 additions and 41 deletions
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41
include/mapnik/graphics.hpp
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@ -117,47 +117,6 @@ public:
return data_.height();
}
template <typename MergeMethod>
inline void merge_rectangle(image_data_rgba8 const& data, unsigned x0, unsigned y0, float opacity)
{
box2d<int> ext0(0,0,data_.width(),data_.height());
box2d<int> ext1(x0,y0,x0 + data.width(),y0 + data.height());
if (ext0.intersects(ext1))
{
box2d<int> box = ext0.intersect(ext1);
for (int y = box.miny(); y < box.maxy(); ++y)
{
unsigned int* row_to = data_.getRow(y);
unsigned int const * row_from = data.getRow(y-y0);
for (int x = box.minx(); x < box.maxx(); ++x)
{
unsigned rgba0 = row_to[x];
unsigned rgba1 = row_from[x-x0];
unsigned a1 = int( ((rgba1 >> 24) & 0xff) * opacity );
if (a1 == 0) continue;
unsigned r1 = rgba1 & 0xff;
unsigned g1 = (rgba1 >> 8 ) & 0xff;
unsigned b1 = (rgba1 >> 16) & 0xff;
unsigned a0 = (rgba0 >> 24) & 0xff;
unsigned r0 = rgba0 & 0xff ;
unsigned g0 = (rgba0 >> 8 ) & 0xff;
unsigned b0 = (rgba0 >> 16) & 0xff;
unsigned a = (a1 * 255 + (255 - a1) * a0 + 127)/255;
MergeMethod::mergeRGB(r0,g0,b0,r1,g1,b1);
r0 = (r1*a1 + (((255 - a1) * a0 + 127)/255) * r0 + 127)/a;
g0 = (g1*a1 + (((255 - a1) * a0 + 127)/255) * g0 + 127)/a;
b0 = (b1*a1 + (((255 - a1) * a0 + 127)/255) * b0 + 127)/a;
row_to[x] = (a << 24)| (b0 << 16) | (g0 << 8) | (r0) ;
}
}
}
}
};
}