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Use ints for the calculations rather than u_char, they could end up

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nicm 2015-06-05 22:50:27 +00:00
parent 55b96a5bd5
commit ed6c036ee3
1 changed files with 5 additions and 4 deletions
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9
colour.c
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@ -313,6 +313,7 @@ colour_find_rgb(u_char r, u_char g, u_char b)
{
struct colour_rgb rgb = { .r = r, .g = g, .b = b }, *found;
u_int distance, lowest, colour, i;
int dr, dg, db;
found = bsearch(&rgb, colour_to_256, nitems(colour_to_256),
sizeof colour_to_256[0], colour_cmp_rgb);
@ -322,11 +323,11 @@ colour_find_rgb(u_char r, u_char g, u_char b)
colour = 16;
lowest = UINT_MAX;
for (i = 0; i < 240; i++) {
r = colour_from_256[i].r - rgb.r;
g = colour_from_256[i].g - rgb.g;
b = colour_from_256[i].b - rgb.b;
dr = (int)colour_from_256[i].r - r;
dg = (int)colour_from_256[i].g - g;
db = (int)colour_from_256[i].b - b;
distance = r * r + g * g + b * b;
distance = dr * dr + dg * dg + db * db;
if (distance < lowest) {
lowest = distance;
colour = 16 + i;