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colorspace: clamp intermediates when dithering
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commit
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1 changed files with 11 additions and 3 deletions
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@ -1823,10 +1823,14 @@ colorspace_dither_verterr (ColorspaceConvert * convert, int j)
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int i;
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int i;
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guint16 *tmpline = convert->tmpline16;
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guint16 *tmpline = convert->tmpline16;
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guint16 *errline = convert->errline;
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guint16 *errline = convert->errline;
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unsigned int mask = 0xff;
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for (i = 0; i < 4 * convert->width; i++) {
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for (i = 0; i < 4 * convert->width; i++) {
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tmpline[i] += errline[i];
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int x = tmpline[i] + errline[i];
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errline[i] = tmpline[i] & 0xff;
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if (x > 65535)
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x = 65535;
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tmpline[i] = x;
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errline[i] = x & mask;
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}
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}
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}
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}
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@ -1847,7 +1851,11 @@ colorspace_dither_halftone (ColorspaceConvert * convert, int j)
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};
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};
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for (i = 0; i < convert->width * 4; i++) {
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for (i = 0; i < convert->width * 4; i++) {
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tmpline[i] += halftone[(i >> 2) & 7][j & 7];
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int x;
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x = tmpline[i] + halftone[(i >> 2) & 7][j & 7];
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if (x > 65535)
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x = 65535;
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tmpline[i] = x;
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}
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}
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}
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}
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