Fix gwenview libpng>1.4.x FTBFS

This closes Bug #337


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/gwenview@1239916 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

src/gvcore/pngformattype.cpp

@@ -245,7 +245,11 @@ void setup_qt( TQImage& image, png_structp png_ptr, png_infop info_ptr )
 		image.setColor( i, tqRgba(c,c,c,0xff) );
 	    }
 	    if ( png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS) ) {
-		const int g = info_ptr->trans_values.gray;
+#if PNG_LIBPNG_VER_MAJOR>1 || ( PNG_LIBPNG_VER_MAJOR==1 && PNG_LIBPNG_VER_MINOR>=4 )
+		const int g = info_ptr->trans_color.gray;
+#else
+ 		const int g = info_ptr->trans_values.gray;
+#endif
 		if (g < ncols) {
 		    image.setAlphaBuffer(TRUE);
 		    image.setColor(g, image.color(g) & TQRGB_MASK);
@@ -273,7 +277,11 @@ void setup_qt( TQImage& image, png_structp png_ptr, png_infop info_ptr )
 		    info_ptr->palette[i].red,
 		    info_ptr->palette[i].green,
 		    info_ptr->palette[i].blue,
-		    info_ptr->trans[i]
+#if PNG_LIBPNG_VER_MAJOR>1 || ( PNG_LIBPNG_VER_MAJOR==1 && PNG_LIBPNG_VER_MINOR>=4 )
+		    info_ptr->trans_alpha[i]
+#else
+ 		    info_ptr->trans[i]
+#endif
 		    )
 		);
 		i++;