mirror of
https://github.com/buserror/mii_emu.git
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109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
#!/usr/bin/tcc -run
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/*
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* This tool is made to load a PNG, and convert it to a C array with
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* ARGB8888 format, premultiplied alpha.
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* It uses stb_image.h to load the PNG, which isn't included in the
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* repository. The tool isn't essential to build, but is useful if you
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* want icons in your menus.
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* The output is a C array, with the width and height of the image
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* followed by the pixels in ARGB8888 format.
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* The output is written to stdout, unless -o is used.
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*/
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#include <ctype.h>
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#define STB_IMAGE_IMPLEMENTATION
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#define STBI_NO_SIMD
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#define STBI_NO_HDR
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#include "/opt/projects/stb/stb_image.h"
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static void usage(const char *argv0)
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{
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fprintf(stderr,
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"Usage: %s -n <array_name> "
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"[-o <output_filename>] "
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"[-t <int type>] "
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"<PNG filename>\n",
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argv0);
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}
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int main(int argc, char **argv)
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{
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const char *array_name = NULL;
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const char *fname = "docs/Apple_logo_rainbow_version2_28x28.png";
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const char *int_type = "uint32_t";
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FILE *out = stdout;
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for (int i = 1; i < argc; i++) {
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if (!strcmp(argv[i], "-n") && i + 1 < argc) {
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array_name = argv[i + 1];
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i++;
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} else if (!strcmp(argv[i], "-o") && i + 1 < argc) {
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out = fopen(argv[i + 1], "w");
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if (!out) {
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fprintf(stderr, "Error opening %s\n", argv[i + 1]);
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usage(argv[0]);
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return 1;
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}
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i++;
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} else if (!strcmp(argv[i], "-t") && i + 1 < argc) {
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int_type = argv[i + 1];
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i++;
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} else if (!strcmp(argv[i], "-h")) {
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usage(argv[0]);
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return 0;
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} else {
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fname = argv[i];
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}
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}
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if (!array_name) {
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fprintf(stderr, "Missing array name\n");
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usage(argv[0]);
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return 1;
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}
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char define_name[256];
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strcpy(define_name, array_name);
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for (int i = 0; define_name[i]; i++)
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define_name[i] = toupper(define_name[i]);
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int width, height, channels;
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unsigned char *data = stbi_load(fname, &width, &height, &channels, 0);
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if (!data) {
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fprintf(stderr, "Error loading image\n");
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return 1;
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}
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fprintf(out, "// Autogenerated with:\n//\t");
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for (int i = 0; i < argc; i++)
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fprintf(out, " %s", argv[i]);
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fprintf(out, "\n");
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fprintf(out, "// Image with a W:%dpx, H:%dpx and %d channels\n"
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"// Converted to ARGB8888 and premultiplied alpha\n"
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"#pragma once\n",
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width, height, channels);
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fprintf(out, "#define %s_SIZE %d\n", define_name, 2 + (width * height));
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fprintf(out, "extern const %s %s[%s_SIZE];\n", int_type, array_name, define_name);
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fprintf(out, "#ifdef %s_DEFINE\n", define_name);
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fprintf(out, "const %s %s[%s_SIZE] = {\n", int_type, array_name, define_name);
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fprintf(out, "%d, %d, // width, height\n", width, height);
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uint32_t *pixels = (uint32_t *)data;
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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uint32_t pixel = pixels[y * width + x];
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// flip R and B channels
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pixel = (pixel & 0xff00ff00) |
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((pixel & 0xff) << 16) | ((pixel >> 16) & 0xff);
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// also premultiply channels with alpha
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uint32_t a = pixel >> 24;
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pixel = (pixel & ~(0xff << 0)) |
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((((((pixel >> 0) & 0xff) * a) >> 8) & 0xff) << 0);
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pixel = (pixel & ~(0xff << 8)) |
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((((((pixel >> 8) & 0xff) * a) >> 8) & 0xff) << 8);
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pixel = (pixel & ~(0xff << 16)) |
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((((((pixel >> 16) & 0xff) * a) >> 8) & 0xff) << 16);
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fprintf(out, "0x%08x,", pixel);
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if (((y * height) + x) % 8 == 7)
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fprintf(out, "\n");
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}
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}
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fprintf(out, "};\n");
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fprintf(out, "#endif /* %s_DEFINE */\n", define_name);
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return 0;
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}
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