Fixed libpng warning when loading interlaced images

We enable interlace transform when reading png.

Closes GH-8002.

Author: brettwhiteman

NEWS

@@ -5,6 +5,9 @@ PHP                                                                        NEWS
 - Core:
   . Fixed Haiku ZTS build. (David Carlier)
 
+- GD:
+  . Fixed libpng warning when loading interlaced images. (Brett)
+
 - Iconv:
   . Fixed bug GH-7953 (ob_clean() only does not set Content-Encoding). (cmb)
   . Fixed bug GH-7980 (Unexpected result for iconv_mime_decode). (cmb)

ext/gd/libgd/gd_png.c

@@ -336,6 +336,11 @@ gdImagePtr gdImageCreateFromPngCtx (gdIOCtx * infile)
 				break;
 	}
 
+	/* enable the interlace transform if supported */
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+	(void)png_set_interlace_handling(png_ptr);
+#endif
+
 	png_read_update_info(png_ptr, info_ptr);
 
 	/* allocate space for the PNG image data */