$OpenBSD: patch-png_c,v 1.1 2011/07/08 20:38:01 naddy Exp $

Fix build with png-1.5.

--- png.c.orig	Wed Jul  6 11:27:06 2011
+++ png.c	Wed Jul  6 11:28:03 2011
@@ -48,7 +48,7 @@ void img_my_png_warning(png_structp a, png_const_charp
 /* Error for from-web PNG images. */
 void img_my_png_error(png_structp png_ptr, png_const_charp error_string)
 {
-	longjmp(png_ptr->jmpbuf,1);
+	png_longjmp(png_ptr,1);
 }
 
 void png_info_callback(png_structp png_ptr, png_infop info_ptr)
@@ -203,7 +203,7 @@ void png_start(struct cached_image *cimg)
 #ifdef DEBUG
 	if (!info_ptr) internal ("png_create_info_struct failed\n");
 #endif /* #ifdef DEBUG */
-	if (setjmp(png_ptr->jmpbuf)){
+	if (setjmp(png_jmpbuf(png_ptr))){
 error:
 		png_destroy_read_struct(&png_ptr, &info_ptr,
 			(png_infopp)NULL);
@@ -213,7 +213,7 @@ error:
 	png_set_progressive_read_fn(png_ptr, NULL,
 				    png_info_callback, png_row_callback,
 				    png_end_callback);
-   	if (setjmp(png_ptr->jmpbuf)) goto error;
+   	if (setjmp(png_jmpbuf(png_ptr))) goto error;
 	decoder=mem_alloc(sizeof(*decoder));
 	decoder->png_ptr=png_ptr;
 	decoder->info_ptr=info_ptr;
@@ -232,7 +232,7 @@ void png_restart(struct cached_image *cimg, unsigned c
 	png_ptr=((struct png_decoder *)(cimg->decoder))->png_ptr;
 	info_ptr=((struct png_decoder *)(cimg->decoder))->info_ptr;
 	end_callback_hit=0;
-	if (setjmp(png_ptr->jmpbuf)){
+	if (setjmp(png_jmpbuf(png_ptr))){
 		img_end(cimg);
 		return;
 	}
