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Sort Pokemon and trainer sprite palettes, with Makefile-specified exc…
…eptions (#1137) This avoids the need to define their order via indexed PNG palettes It also avoids the need to use gb-asm-tools' palfix.py on custom sprites Fixes #1136
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,4 @@ | ||
| gbcpal | ||
| gfx | ||
| lzcomp | ||
| make_patch | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| #define PROGRAM_NAME "gbcpal" | ||
| #define USAGE_OPTS "[-h|--help] [-r|--reverse] out.gbcpal in.gbcpal..." | ||
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| #include "common.h" | ||
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| bool reverse; | ||
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| void parse_args(int argc, char *argv[]) { | ||
| struct option long_options[] = { | ||
| {"reverse", no_argument, 0, 'r'}, | ||
| {"help", no_argument, 0, 'h'}, | ||
| {0} | ||
| }; | ||
| for (int opt; (opt = getopt_long(argc, argv, "rh", long_options)) != -1;) { | ||
| switch (opt) { | ||
| case 'r': | ||
| reverse = true; | ||
| break; | ||
| case 'h': | ||
| usage_exit(0); | ||
| break; | ||
| default: | ||
| usage_exit(1); | ||
| } | ||
| } | ||
| } | ||
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| struct Color { | ||
| uint8_t r, g, b; | ||
| }; | ||
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| const struct Color BLACK = {0, 0, 0}; | ||
| const struct Color WHITE = {31, 31, 31}; | ||
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| uint16_t pack_color(struct Color color) { | ||
| return (color.b << 10) | (color.g << 5) | color.r; | ||
| } | ||
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| struct Color unpack_color(uint16_t gbc_color) { | ||
| return (struct Color){ | ||
| .r = gbc_color & 0x1f, | ||
| .g = (gbc_color >> 5) & 0x1f, | ||
| .b = (gbc_color >> 10) & 0x1f, | ||
| }; | ||
| } | ||
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| double luminance(struct Color color) { | ||
| return 0.299 * color.r + 0.587 * color.g + 0.114 * color.b; | ||
| } | ||
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| int compare_colors(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); | ||
| } | ||
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| void read_gbcpal(const char *filename, struct Color **colors, size_t *num_colors) { | ||
| long filesize; | ||
| uint8_t *bytes = read_u8(filename, &filesize); | ||
| if (filesize == 0) { | ||
| error_exit("%s: empty gbcpal file\n", filename); | ||
| } | ||
| if (filesize % 2) { | ||
| error_exit("%s: invalid gbcpal file\n", filename); | ||
| } | ||
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| size_t new_colors = filesize / 2; | ||
| *colors = xrealloc(*colors, (sizeof **colors) * (*num_colors + new_colors)); | ||
| for (size_t i = 0; i < new_colors; i++) { | ||
| uint16_t gbc_color = (bytes[i * 2 + 1] << 8) | bytes[i * 2]; | ||
| (*colors)[*num_colors + i] = unpack_color(gbc_color); | ||
| } | ||
| *num_colors += new_colors; | ||
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| free(bytes); | ||
| } | ||
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| void filter_colors(struct Color *colors, size_t *num_colors) { | ||
| size_t num_filtered = 0; | ||
| // 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; | ||
| } | ||
| } | ||
| colors[num_filtered++] = color; | ||
| } | ||
| *num_colors = num_filtered; | ||
| } | ||
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| int main(int argc, char *argv[]) { | ||
| parse_args(argc, argv); | ||
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| argc -= optind; | ||
| argv += optind; | ||
| if (argc < 2) { | ||
| usage_exit(1); | ||
| } | ||
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| const char *out_filename = argv[0]; | ||
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| struct Color *colors = NULL; | ||
| size_t num_colors = 0; | ||
| for (int i = 1; i < argc; i++) { | ||
| read_gbcpal(argv[i], &colors, &num_colors); | ||
| } | ||
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| qsort(colors, num_colors, sizeof(*colors), compare_colors); | ||
| filter_colors(colors, &num_colors); | ||
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| struct Color pal_colors[4] = { | ||
| WHITE, | ||
| num_colors > 0 ? colors[0] : WHITE, | ||
| num_colors > 1 ? colors[1] : num_colors > 0 ? colors[0] : BLACK, | ||
| BLACK, | ||
| }; | ||
| if (num_colors > 2) { | ||
| error_exit("%s: more than 2 colors besides black and white (%zu)\n", out_filename, num_colors); | ||
| } | ||
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| uint8_t bytes[COUNTOF(pal_colors) * 2] = {0}; | ||
| for (size_t i = 0; i < COUNTOF(pal_colors); i++) { | ||
| uint16_t packed_color = pack_color(pal_colors[i]); | ||
| bytes[2 * i] = packed_color & 0xff; | ||
| bytes[2 * i + 1] = packed_color >> 8; | ||
| } | ||
| write_u8(out_filename, bytes, COUNTOF(bytes)); | ||
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| free(colors); | ||
| return 0; | ||
| } |
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