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-rw-r--r--src/png.c61
1 files changed, 60 insertions, 1 deletions
diff --git a/src/png.c b/src/png.c
index 76b4461..b814fc4 100644
--- a/src/png.c
+++ b/src/png.c
@@ -1,6 +1,65 @@
+#include <png.h>
+
#include "meh.h"
unsigned char *loadpng(FILE *infile, int *bufwidth, int *bufheight){
- return NULL;
+ png_structp png_ptr;
+ png_infop info_ptr;
+ png_infop end_info;
+ int numpasses = 1;
+ unsigned char *buf;
+
+ if((png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL)) == NULL)
+ return NULL;
+ if((info_ptr = png_create_info_struct(png_ptr)) == NULL){
+ png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
+ return NULL;
+ }
+ if((end_info = png_create_info_struct(png_ptr)) == NULL){
+ png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
+ return NULL;
+ }
+ if(setjmp(png_jmpbuf(png_ptr))){
+ png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
+ return NULL;
+ }
+
+ png_init_io(png_ptr, infile);
+
+ /* Start reading */
+ png_read_info(png_ptr, info_ptr);
+ buf = malloc(100);
+ {
+ png_byte color_type = png_get_color_type(png_ptr, info_ptr);
+ if(color_type == PNG_COLOR_TYPE_PALETTE)
+ png_set_palette_to_rgb(png_ptr);
+ if(color_type == PNG_COLOR_TYPE_GRAY && png_get_bit_depth(png_ptr, info_ptr) < 8)
+ png_set_gray_1_2_4_to_8(png_ptr);
+ if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
+ png_set_tRNS_to_alpha(png_ptr);
+ if (png_get_bit_depth(png_ptr, info_ptr) == 16)
+ png_set_strip_16(png_ptr);
+ if(color_type & PNG_COLOR_MASK_ALPHA)
+ png_set_strip_alpha(png_ptr);
+ if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+ png_set_gray_to_rgb(png_ptr);
+ if(png_get_interlace_type == PNG_INTERLACE_ADAM7)
+ numpasses = png_set_interlace_handling(png_ptr);
+ png_read_update_info(png_ptr, info_ptr);
+ }
+ {
+ int y;
+ *bufwidth = png_get_image_width(png_ptr, info_ptr);
+ *bufheight = png_get_image_height(png_ptr, info_ptr);
+ buf = malloc((*bufwidth) * (*bufheight) * 3);
+ printf("%ix%i\n", *bufwidth, *bufheight);
+ while(numpasses--){
+ for(y = 0; y < *bufheight; y++)
+ png_read_row(png_ptr, &buf[y * (*bufwidth) * 3], NULL);
+ }
+ }
+
+ printf("reached end\n");
+ return buf;
}