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/* arrow.c
* (c) 2001 Karel 'Clock' Kulhavy
* This program is a part of Links project.
* It takes a 32x? png image (truecolor one) and puts stdout a hex representation.
*/
#include <stdlib.h>
#include <stdio.h>
#include <png.h>
double r[256],g[256],b[256];
unsigned char rc[256],gc[256],bc[256];
double red_thr=130, green_thr=78, blue_thr=33;
double red_gamma=2000,green_gamma=2000,blue_gamma=2000;
void print_row_hex(FILE *f, unsigned char *buf, int n)
{
int val1=0, val0=0, a;
for (a=0;a<n;a++){
val1<<=1;
if (*buf==255&&buf[1]==255&&buf[2]==255)val1|=1;
val0<<=1;
if (!*buf&&!buf[1]&&!buf[2])val0|=1;
buf+=3;
}
fprintf(f,"\t0x%08xU,0x%08xU,\n", val0, val1);
}
int main(int argc, char **argv)
{
int x,y;
unsigned char* image;
png_structp png_ptr_read;
png_infop info_ptr_read;
FILE *in_file, *out_file;
double gamma;
in_file=fopen("arrow.png","r");
out_file=fopen("arrow.inc","w");
if (!(in_file&&out_file)){
perror("arrow");
exit(1);
}
png_ptr_read=png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL,
NULL);
info_ptr_read=png_create_info_struct(png_ptr_read);
png_init_io(png_ptr_read, in_file);
png_read_info(png_ptr_read, info_ptr_read);
x=png_get_image_width(png_ptr_read,info_ptr_read);
y=png_get_image_height(png_ptr_read,info_ptr_read);
if (png_get_gAMA(png_ptr_read,info_ptr_read, &gamma))
{
png_set_gamma(png_ptr_read, 1, gamma);
}
else
{
png_set_gamma(png_ptr_read, 1, 1.0);
}
png_read_update_info(png_ptr_read, info_ptr_read);
image=malloc(3*x);
if (!image){
fprintf(stderr,"Not enough memory\n");
exit(1);
}
fprintf(out_file,"/* Automatically generated by the program \"arrow\" (arrow.c) */\n\n");
fprintf(out_file,"enum {arrow_width=32, arrow_height=%d, arrow_area=%d};\n",y,y*32);
fprintf(out_file,"\nstatic_const unsigned int arrow[%d]={\n",y+y);
for (;y;y--){
png_read_row(png_ptr_read,image,NULL);
print_row_hex(out_file,image,x);
}
fprintf(out_file,"};\n");
free(image);
png_read_end(png_ptr_read, NULL);
png_destroy_read_struct(&png_ptr_read, &info_ptr_read, NULL);
fclose(in_file);
return 0;
}
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