png: fix compilation with libpng 1.4

png_set_gray_1_2_4_to_8() has been deprecated for a while and was
finally removed in libpng 1.4.x. Use png_set_expand_gray_1_2_4_to_8()
instead.

Fixes #608629.

diff --git a/ext/libpng/gstpngdec.c b/ext/libpng/gstpngdec.c
index dde459d..9c4f9a3 100644 (file)
--- a/ext/libpng/gstpngdec.c
+++ b/ext/libpng/gstpngdec.c
@@ -397,7 +397,11 @@ gst_pngdec_caps_create_and_set (GstPngDec * pngdec)
     png_set_gray_to_rgb (pngdec->png);
     if (bpc < 8) {              /* Convert to 8 bits */
       GST_LOG_OBJECT (pngdec, "converting grayscale image to 8 bits");
+#if PNG_LIBPNG_VER < 10400
       png_set_gray_1_2_4_to_8 (pngdec->png);
+#else
+      png_set_expand_gray_1_2_4_to_8 (pngdec->png);
+#endif
     }
   }