kopia lustrzana https://github.com/fellesverkstedet/fabmodules
67 wiersze
1.7 KiB
C
67 wiersze
1.7 KiB
C
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <png.h>
|
|
|
|
int x, y;
|
|
int width, height;
|
|
png_byte color_type;
|
|
png_byte bit_depth;
|
|
png_structp png_ptr;
|
|
png_infop info_ptr;
|
|
png_bytep * row_pointers;
|
|
|
|
void read_png_file(char* file_name) {
|
|
FILE *fp = fopen(file_name, "rb");
|
|
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
|
|
NULL,NULL,NULL);
|
|
info_ptr = png_create_info_struct(png_ptr);
|
|
png_init_io(png_ptr, fp);
|
|
png_read_info(png_ptr, info_ptr);
|
|
width = info_ptr->width;
|
|
height = info_ptr->height;
|
|
color_type = info_ptr->color_type;
|
|
bit_depth = info_ptr->bit_depth;
|
|
printf("width %d height %d color %d bit %d\n",
|
|
width,height,color_type,bit_depth);
|
|
row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height);
|
|
for (y=0; y<height; y++)
|
|
row_pointers[y] = (png_byte*) malloc(info_ptr->rowbytes);
|
|
png_read_image(png_ptr, row_pointers);
|
|
fclose(fp);
|
|
}
|
|
|
|
void write_png_file(char* file_name) {
|
|
FILE *fp = fopen(file_name, "wb");
|
|
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
|
|
NULL,NULL,NULL);
|
|
info_ptr = png_create_info_struct(png_ptr);
|
|
png_init_io(png_ptr, fp);
|
|
png_set_IHDR(png_ptr, info_ptr, width, height,
|
|
bit_depth, color_type, PNG_INTERLACE_NONE,
|
|
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
|
|
png_write_info(png_ptr, info_ptr);
|
|
png_write_image(png_ptr, row_pointers);
|
|
png_write_end(png_ptr, NULL);
|
|
fclose(fp);
|
|
}
|
|
|
|
void process_file(void) {
|
|
png_byte *ptr;
|
|
for (y = 0; y < height; y++)
|
|
for (x = 0; x < width; x++) {
|
|
ptr = &(row_pointers[y][x*3]);
|
|
ptr[0] = 255;
|
|
ptr[1] = ptr[2];
|
|
}
|
|
}
|
|
|
|
int main(int argc, char **argv) {
|
|
if (argc != 3) {
|
|
printf("Usage: program_name <file_in> <file_out>\n");
|
|
exit(0);
|
|
}
|
|
read_png_file(argv[1]);
|
|
process_file();
|
|
write_png_file(argv[2]);
|
|
}
|