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Fix overflow in redmean distance formula

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dP
2023-12-22 23:50:15 +05:30
parent 657295d0c5
commit 8cb1f5c153
1 changed files with 5 additions and 5 deletions
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10
src/blitter/32bpp_base.hpp
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@@ -188,11 +188,11 @@ public:
uint md = UINT_MAX;
for (uint8 i = 1; i < 0xc0; i++) {
auto c = this->LookupColourInPalette(i);
auto rmean = ((uint)c.r + (uint)r) / 2;
auto dr = (uint)c.r - (uint)r;
auto dg = (uint)c.g - (uint)g;
auto db = (uint)c.b - (uint)b;
auto dist = (512 + rmean) * dr * dr + 1024 * dg * dg + (767 - rmean) * db * db;
auto rmean = (int)c.r + (int)r;
auto dr = (int)c.r - (int)r;
auto dg = (int)c.g - (int)g;
auto db = (int)c.b - (int)b;
auto dist = (1020 + rmean) * dr * dr + 2040 * dg * dg + (1530 - rmean) * db * db;
// auto dist = r * r + g * g + b * b;
if (dist < md) {
md = dist;