forked from old/legacy-imlib2
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
#include "common.h"
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#include "blend.h"
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void
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BlendRGBAToRGBA(DATA32 *src, int src_jump, DATA32 *dst, int dst_jump,
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int w, int h)
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{
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int x, y;
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DATA32 *p1, *p2;
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for (y = 0; y < h; y++)
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{
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DATA8 a, nr, ng, nb, r, g, b, rr, gg, bb;
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int tmp;
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p1 = src + (y * (w + src_jump));
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p2 = dst + (y * (w + dst_jump));
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for (x = 0; x < w; x++)
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{
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a = (*p1 >> 24) & 0xff;
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if (a < 255)
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{
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#if 1
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r = 255 - a;
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*p2 =
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((((*p1 & 0x00ff00ff) * a) >> 8) & 0x00ff00ff) +
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((((*p1 >> 8) & 0x00ff00ff) * a) & 0xff00ff00) +
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((((*p2 & 0x00ff00ff) * r) >> 8) & 0x00ff00ff) +
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((((*p2 >> 8) & 0x00ff00ff) * r) & 0xff00ff00);
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#else
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r = (*p1 ) & 0xff;
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g = (*p1 >> 8 ) & 0xff;
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b = (*p1 >> 16) & 0xff;
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rr = (*p2 ) & 0xff;
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gg = (*p2 >> 8 ) & 0xff;
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bb = (*p2 >> 16) & 0xff;
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tmp = (r - rr) * a;
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nr = rr + ((tmp + (tmp >> 8) + 0x80) >> 8);
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tmp = (g - gg) * a;
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ng = gg + ((tmp + (tmp >> 8) + 0x80) >> 8);
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tmp = (b - bb) * a;
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nb = bb + ((tmp + (tmp >> 8) + 0x80) >> 8);
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*p2 = ((nb & 0xff) << 16) | ((ng & 0xff) << 8) | (nr & 0xff);
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#endif
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}
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else
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*p2 = *p1;
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p1++;
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p2++;
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}
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}
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}
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