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#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <png.h>
#define die(msg) do { fprintf(stderr, "%s\n", msg); abort(); } while(0)
void write_png(FILE *out, const char *filename) {
FILE *fp = fopen(filename, "rb");
if (!fp)
die("png fopen failed");
png_byte header[8] = {};
if(fread(header, 1, 8, fp) != 8)
die("png fread failed");
if(png_sig_cmp(header, 0, 8))
die("png_sig_cmp failed");
png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(!png)
die("png_create_read_struct failed");
png_set_expand(png);
png_set_strip_alpha(png);
png_infop png_info = png_create_info_struct(png);
if (!png_info)
die("png_create_info_struct failed");
if (setjmp(png_jmpbuf(png)))
die("png_init_io failed");
png_init_io(png, fp);
png_set_sig_bytes(png, 8);
png_read_info(png, png_info);
int width = png_get_image_width(png, png_info);
int height = png_get_image_height(png, png_info);
if(width != 24 || height != 24)
die("not a 24x24 png");
png_read_update_info(png, png_info);
if (setjmp(png_jmpbuf(png)))
die("png_read_image failed");
png_bytepp image = (png_bytepp) malloc(sizeof(png_bytep) * height);
for (int y = 0; y < height; y++)
image[y] = (png_bytep) malloc(png_get_rowbytes(png, png_info));
png_read_image(png, (png_bytepp) image);
for(int y = height - 1; y >= 0; y--) {
for(int x = 0; x < (int)png_get_rowbytes(png, png_info); x += 3) {
unsigned char r = image[y][x + 0],
g = image[y][x + 1],
b = image[y][x + 2];
if(r + g + b < 11)
r = g = b = 30;
fprintf(out, " 0x%02x, 0x%02x, 0x%02x,\n", r, g, b);
}
}
for (int y = 0; y < height; y++)
free(image[y]);
free(image);
fclose(fp);
png_destroy_read_struct(&png, &png_info, NULL);
}
int main(int argc, char** argv) {
if(argc < 3) {
fprintf(stderr, "Usage: %s <source out> <header out> <png in>...\n",
argv[0]);
return 1;
}
FILE *source = fopen(argv[1], "wt");
if(!source)
die("source fopen failed");
FILE *header = fopen(argv[2], "wt");
if(!header)
die("header fopen failed");
fprintf(source, "/**** This is a generated file - do not edit ****/\n\n");
fprintf(header, "/**** This is a generated file - do not edit ****/\n\n");
for(int i = 3; i < argc; i++) {
const char *filename = argv[i];
const char *basename = strrchr(filename, '/'); /* cmake uses / even on Windows */
if(basename == NULL) {
basename = filename;
} else {
basename++; // skip separator
}
char *stemname = (char*) calloc(strlen(basename), 1);
strncpy(stemname, basename, strchr(basename, '.') - basename);
for(size_t j = 0; j < strlen(stemname); j++) {
if(!isalnum(stemname[j]))
stemname[j] = '_';
}
fprintf(header, "extern unsigned char Icon_%s[24*24*3];\n", stemname);
fprintf(source, "unsigned char Icon_%s[24*24*3] = {\n", stemname);
write_png(source, filename);
fprintf(source, "};\n\n");
free(stemname);
}
fclose(source);
fclose(header);
}
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