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o Make brightness-lookup less expensive.

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This commit is contained in:
Henner Zeller 2016-09-03 17:52:54 -07:00
parent f083838032
commit b4b511a459
1 changed files with 11 additions and 8 deletions
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19
lib/framebuffer.cc
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@ -206,20 +206,23 @@ static uint16_t luminance_cie1931(uint8_t c, uint8_t brightness) {
return out_factor * ((v <= 8) ? v / 902.3 : pow((v + 16) / 116.0, 3));
}
static uint16_t *CreateLuminanceCIE1931LookupTable() {
uint16_t *result = new uint16_t[256 * 100];
for (int i = 0; i < 256; ++i)
for (int j = 0; j < 100; ++j)
result[i * 100 + j] = luminance_cie1931(i, j + 1);
struct ColorLookup {
uint16_t color[256];
};
static ColorLookup *CreateLuminanceCIE1931LookupTable() {
ColorLookup *for_brightness = new ColorLookup[100];
for (int c = 0; c < 256; ++c)
for (int b = 0; b < 100; ++b)
for_brightness[b].color[c] = luminance_cie1931(c, b + 1);
return result;
return for_brightness;
}
inline uint16_t Framebuffer::MapColor(uint8_t c) {
uint16_t result;
if (do_luminance_correct_) {
static uint16_t *luminance_lookup = CreateLuminanceCIE1931LookupTable();
result = luminance_lookup[c * 100 + (brightness_ - 1)];
static ColorLookup *luminance_lookup = CreateLuminanceCIE1931LookupTable();
result = luminance_lookup[brightness_ - 1].color[c];
} else {
// simple scale down the color value
c = c * brightness_ / 100;