fixed png

1 files changed, 19 insertions, 17 deletions

diff --git a/src/png.c b/src/png.c
index f10ba64..47e4f0e 100644
--- a/src/png.c
+++ b/src/png.c
@@ -13,13 +13,11 @@ struct png_t{
 	int numpasses;
 };
 
-static unsigned char png_head[8] = { 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a };
-
 static int ispng(FILE *f){
 	unsigned char buf[8];
 	if(fread(buf, 1, 8, f) != 8)
 		return 0;
-	return !memcmp(buf, png_head, 8);
+	return png_check_sig(buf, 8);
 }
 
 struct image *png_open(FILE *f){
@@ -56,19 +54,19 @@ struct image *png_open(FILE *f){
 
 	png_read_info(p->png_ptr, p->info_ptr);
 	{
-		png_byte color_type = png_get_color_type(p->png_ptr, p->info_ptr);
-		if(color_type == PNG_COLOR_TYPE_PALETTE)
-			png_set_palette_to_rgb(p->png_ptr);
-		if(color_type == PNG_COLOR_TYPE_GRAY && png_get_bit_depth(p->png_ptr, p->info_ptr) < 8)
-			png_set_gray_1_2_4_to_8(p->png_ptr);
+		int color_type = png_get_color_type(p->png_ptr, p->info_ptr);
+		int bit_depth = png_get_bit_depth(p->png_ptr, p->info_ptr);
+		if (color_type == PNG_COLOR_TYPE_PALETTE)
+			png_set_expand(p->png_ptr);
+		if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
+			png_set_expand(p->png_ptr);
 		if (png_get_valid(p->png_ptr, p->info_ptr, PNG_INFO_tRNS))
-			png_set_tRNS_to_alpha(p->png_ptr);
-		if (png_get_bit_depth(p->png_ptr, p->info_ptr) == 16)
+			png_set_expand(p->png_ptr);
+		if (bit_depth == 16)
 			png_set_strip_16(p->png_ptr);
-		if(color_type & PNG_COLOR_MASK_ALPHA)
-			png_set_strip_alpha(p->png_ptr);
 		if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
 			png_set_gray_to_rgb(p->png_ptr);
+		png_set_strip_alpha(p->png_ptr);
 		if(png_get_interlace_type(p->png_ptr, p->info_ptr) == PNG_INTERLACE_ADAM7)
 			p->numpasses = png_set_interlace_handling(p->png_ptr);
 		else
@@ -84,16 +82,20 @@ struct image *png_open(FILE *f){
 
 int png_read(struct image *img){
 	unsigned int y;
+    png_bytepp row_pointers;
+
 	struct png_t *p = (struct png_t *)img;
 	if(setjmp(png_jmpbuf(p->png_ptr))){
 		png_destroy_read_struct(&p->png_ptr, &p->info_ptr, &p->end_info);
 		return 1;
 	}
-	while(p->numpasses--){
-		for(y = 0; y < img->height; y++){
-			png_read_row(p->png_ptr, &img->buf[y * img->width * 3], NULL);
-		}
-	}
+
+    row_pointers = (png_bytepp)malloc(img->height * sizeof(png_bytep));
+    for(y = 0; y < img->height; y++)
+		row_pointers[y] = img->buf + y * img->width * 3;
+
+    png_read_image(p->png_ptr, row_pointers);
+
 	png_destroy_read_struct(&p->png_ptr, &p->info_ptr, &p->end_info);
 	return 0;
 }