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Minor change in initBestfit() and Palette::findBestfit()

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This commit is contained in:
David Capello 2015-07-03 14:28:37 -03:00
parent 66168d6b06
commit be70c1645b
1 changed files with 17 additions and 9 deletions
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26
src/doc/palette.cpp
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@ -189,18 +189,26 @@ int Palette::findExactMatch(int r, int g, int b, int a) const
//////////////////////////////////////////////////////////////////////
// Based on Allegro's bestfit_color
static std::vector<unsigned int> col_diff;
static std::vector<uint32_t> col_diff;
static uint32_t* col_diff_g;
static uint32_t* col_diff_r;
static uint32_t* col_diff_b;
static uint32_t* col_diff_a;
static void initBestfit()
{
col_diff.resize(4*128, 0);
col_diff_g = &col_diff[128*0];
col_diff_r = &col_diff[128*1];
col_diff_b = &col_diff[128*2];
col_diff_a = &col_diff[128*3];
for (int i=1; i<64; ++i) {
int k = i * i;
col_diff[0 +i] = col_diff[0 +128-i] = k * 59 * 59;
col_diff[128+i] = col_diff[128+128-i] = k * 30 * 30;
col_diff[256+i] = col_diff[256+128-i] = k * 11 * 11;
col_diff[384+i] = col_diff[384+128-i] = k * 8 * 8;
col_diff_g[i] = col_diff_g[128-i] = k * 59 * 59;
col_diff_r[i] = col_diff_r[128-i] = k * 30 * 30;
col_diff_b[i] = col_diff_b[128-i] = k * 11 * 11;
col_diff_a[i] = col_diff_a[128-i] = k * 8 * 8;
}
}
@ -230,13 +238,13 @@ int Palette::findBestfit(int r, int g, int b, int a, int mask_index) const
for (int i=0; i<size; ++i) {
color_t rgb = m_colors[i];
int coldiff = col_diff[((rgba_getg(rgb)>>3) - g) & 0x7F];
int coldiff = col_diff_g[((rgba_getg(rgb)>>3) - g) & 127];
if (coldiff < lowest) {
coldiff += col_diff[128 + (((rgba_getr(rgb)>>3) - r) & 0x7F)];
coldiff += col_diff_r[(((rgba_getr(rgb)>>3) - r) & 127)];
if (coldiff < lowest) {
coldiff += col_diff[256 + (((rgba_getb(rgb)>>3) - b) & 0x7F)];
coldiff += col_diff_b[(((rgba_getb(rgb)>>3) - b) & 127)];
if (coldiff < lowest) {
coldiff += col_diff[384 + (((rgba_geta(rgb)>>3) - a) & 0x7F)];
coldiff += col_diff_a[(((rgba_geta(rgb)>>3) - a) & 127)];
if (coldiff < lowest && i != mask_index) {
if (coldiff == 0)
return i;