--- src/png.c
+++ src/png.c
@@ -142,7 +142,7 @@
   }
   if (setjmp(png_jmpbuf(png_ptr))) {
      if (png_image) {
-	 for (y = 0 ; y < info_ptr->height ; y++)
+	 for (y = 0 ; y < png_get_image_height(png_ptr, info_ptr) ; y++)
 	     free (png_image[y]);
 	 free (png_image);
      }
@@ -161,19 +161,19 @@
   png_set_sig_bytes (png_ptr, SIG_CHECK_SIZE);
   png_read_info (png_ptr, info_ptr);
 
-  if (8 != info_ptr->bit_depth) {
+  if (8 != png_get_bit_depth(png_ptr, info_ptr)) {
     fprintf(stderr, "bit depth type must be 8, not %d.\n",
-	    info_ptr->bit_depth);
+	    png_get_bit_depth(png_ptr, info_ptr));
     return 0;
   }
 
-  *width = info_ptr->width;
-  *height = info_ptr->height;
+  *width = png_get_image_width(png_ptr, info_ptr);
+  *height = png_get_image_height(png_ptr, info_ptr);
   p = q = malloc(4 * *width * *height);
-  png_image = (png_byte **)malloc (info_ptr->height * sizeof (png_byte*));
+  png_image = (png_byte **)malloc (png_get_image_height(png_ptr, info_ptr) * sizeof (png_byte*));
 
-  linesize = info_ptr->width;
-  switch (info_ptr->color_type) {
+  linesize = png_get_image_width(png_ptr, info_ptr);
+  switch (png_get_color_type(png_ptr, info_ptr)) {
     case PNG_COLOR_TYPE_RGB:
       linesize *= 3;
       break;
@@ -182,21 +182,21 @@
       break;
   default:
     fprintf(stderr, "color type must be RGB or RGBA not %d.\n",
-	    info_ptr->color_type);
+	    png_get_color_type(png_ptr, info_ptr));
     return 0;
   }
 
-  for (y = 0 ; y < info_ptr->height ; y++) {
+  for (y = 0 ; y < png_get_image_height(png_ptr, info_ptr) ; y++) {
     png_image[y] = malloc (linesize);
   }
   png_read_image (png_ptr, png_image);
   png_read_end (png_ptr, info_ptr);
 
-  for (y = 0 ; y < info_ptr->height ; y++) {
+  for (y = 0 ; y < png_get_image_height(png_ptr, info_ptr) ; y++) {
     unsigned char *s = png_image[y];
-    for (x = 0 ; x < info_ptr->width ; x++) {
+    for (x = 0 ; x < png_get_image_width(png_ptr, info_ptr) ; x++) {
 
-      switch (info_ptr->color_type) {
+      switch (png_get_color_type(png_ptr, info_ptr)) {
       case PNG_COLOR_TYPE_RGB:
 	p[0] = s[0];
 	p[1] = s[1];
@@ -217,7 +217,7 @@
     }
   }
 
-  for (y = 0 ; y < info_ptr->height ; y++)
+  for (y = 0 ; y < png_get_image_height(png_ptr, info_ptr) ; y++)
     free (png_image[y]);
   free (png_image);
   png_destroy_read_struct (&png_ptr, &info_ptr, (png_infopp)NULL);