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Use ints for the calculations rather than u_char, they could end up
signed.
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parent
55b96a5bd5
commit
ed6c036ee3
9
colour.c
9
colour.c
@ -313,6 +313,7 @@ colour_find_rgb(u_char r, u_char g, u_char b)
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{
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struct colour_rgb rgb = { .r = r, .g = g, .b = b }, *found;
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u_int distance, lowest, colour, i;
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int dr, dg, db;
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found = bsearch(&rgb, colour_to_256, nitems(colour_to_256),
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sizeof colour_to_256[0], colour_cmp_rgb);
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@ -322,11 +323,11 @@ colour_find_rgb(u_char r, u_char g, u_char b)
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colour = 16;
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lowest = UINT_MAX;
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for (i = 0; i < 240; i++) {
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r = colour_from_256[i].r - rgb.r;
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g = colour_from_256[i].g - rgb.g;
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b = colour_from_256[i].b - rgb.b;
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dr = (int)colour_from_256[i].r - r;
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dg = (int)colour_from_256[i].g - g;
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db = (int)colour_from_256[i].b - b;
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distance = r * r + g * g + b * b;
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distance = dr * dr + dg * dg + db * db;
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if (distance < lowest) {
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lowest = distance;
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colour = 16 + i;
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