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Refactor gbcpal.c

This commit is contained in:
Rangi42 2024-10-17 14:19:15 -04:00
parent e59624d1f5
commit 901813a343
1 changed files with 10 additions and 15 deletions
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25
tools/gbcpal.c
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@ -44,15 +44,19 @@ struct Color unpack_color(uint16_t gbc_color) {
};
}
bool same_color(struct Color color1, struct Color color2) {
return color1.r == color2.r && color1.g == color2.g && color1.b == color2.b;
}
double luminance(struct Color color) {
return 0.299 * color.r + 0.587 * color.g + 0.114 * color.b;
}
int compare_colors(const void *color1, const void *color2) {
int compare_luminance(const void *color1, const void *color2) {
double lum1 = luminance(*(const struct Color *)color1);
double lum2 = luminance(*(const struct Color *)color2);
// sort lightest to darkest, or darkest to lightest if reversed
return reverse ? (lum1 > lum2) - (lum1 < lum2) : (lum1 < lum2) - (lum1 > lum2);
return ((lum1 < lum2) - (lum1 > lum2)) * (reverse ? -1 : 1);
}
void read_gbcpal(const char *filename, struct Color **colors, size_t *num_colors) {
@ -81,20 +85,11 @@ void filter_colors(struct Color *colors, size_t *num_colors) {
// filter out black, white, and duplicate colors
for (size_t i = 0; i < *num_colors; i++) {
struct Color color = colors[i];
if (color.r == BLACK.r && color.g == BLACK.g && color.b == BLACK.b) {
continue;
}
if (color.r == WHITE.r && color.g == WHITE.g && color.b == WHITE.b) {
continue;
}
if (num_filtered > 0) {
struct Color last = colors[num_filtered - 1];
if (color.r == last.r && color.g == last.g && color.b == last.b) {
continue;
}
}
if (!same_color(color, BLACK) && !same_color(color, WHITE) &&
(num_filtered == 0 || !same_color(color, colors[num_filtered - 1]))) {
colors[num_filtered++] = color;
}
}
*num_colors = num_filtered;
}
@ -115,7 +110,7 @@ int main(int argc, char *argv[]) {
read_gbcpal(argv[i], &colors, &num_colors);
}
qsort(colors, num_colors, sizeof(*colors), compare_colors);
qsort(colors, num_colors, sizeof(*colors), compare_luminance);
filter_colors(colors, &num_colors);
struct Color pal_colors[4] = {