From a4d07a64e85a1e1f59c15c6faf27e569b267473e Mon Sep 17 00:00:00 2001
From: Kevin Walzer <kw@codebykevin.com>
Date: Mon, 26 Oct 2015 11:31:06 +0000
Subject: Fix for PNG rendering on OS X 10.11; thanks to Stephan Meier for
 patch

---
 macosx/tkMacOSXXStubs.c | 41 +++++++++++++++++++++++++++--------------
 1 file changed, 27 insertions(+), 14 deletions(-)

diff --git a/macosx/tkMacOSXXStubs.c b/macosx/tkMacOSXXStubs.c
index 0be5416..59c6a56 100644
--- a/macosx/tkMacOSXXStubs.c
+++ b/macosx/tkMacOSXXStubs.c
@@ -890,6 +890,7 @@ XGetImage(
     int format)
 {
     NSBitmapImageRep *bitmap_rep;
+    NSUInteger         bitmap_fmt;
     XImage *       imagePtr = NULL;
     char *           bitmap = NULL;
     char *           image_data=NULL;
@@ -908,9 +909,10 @@ XGetImage(
 	}
 
 	bitmap_rep =  BitmapRepFromDrawableRect(d, x, y,width, height);
+	bitmap_fmt = [bitmap_rep bitmapFormat];
 
 	if ( bitmap_rep == Nil                        ||
-	     [bitmap_rep bitmapFormat] != 0    || 
+	      (bitmap_fmt != 0 && bitmap_fmt != 1)     ||
 	     [bitmap_rep samplesPerPixel] != 4 ||
 	     [bitmap_rep isPlanar] != 0               ) {
 	    TkMacOSXDbgMsg("XGetImage: Failed to construct NSBitmapRep");
@@ -921,9 +923,8 @@ XGetImage(
 	NSImage* ns_image = [[NSImage alloc]initWithSize:image_size];
 	[ns_image addRepresentation:bitmap_rep];
  
-	/* Assume premultiplied nonplanar data with 4 bytes per pixel and alpha last.*/
-	if ( [bitmap_rep bitmapFormat] == 0 &&
-	     [bitmap_rep isPlanar ] == 0 &&
+/* Assume premultiplied nonplanar data with 4 bytes per pixel.*/
+	if ( [bitmap_rep isPlanar ] == 0 &&
 	     [bitmap_rep samplesPerPixel] == 4 ) {
 	    bytes_per_row = [bitmap_rep bytesPerRow];
 	    size = bytes_per_row*height;
@@ -933,18 +934,30 @@ XGetImage(
 		bitmap = ckalloc(size);
 		/*
 		  Oddly enough, the bitmap has the top row at the beginning,
-		  and the pixels are in BGRA format.
+		   and the pixels are in BGRA or ABGR format.
 		*/
-		for (row=0, n=0; row<height; row++, n+=bytes_per_row) {
-		    for (m=n; m<n+bytes_per_row; m+=4) {
-			*(bitmap+m)     = *(image_data+m+2);
-			*(bitmap+m+1) = *(image_data+m+1);
-			*(bitmap+m+2) = *(image_data+m);
-			*(bitmap+m+3) = *(image_data+m+3);
+	if (bitmap_fmt == 0) {
+		    /* BGRA */
+		    for (row=0, n=0; row<height; row++, n+=bytes_per_row) {
+			for (m=n; m<n+bytes_per_row; m+=4) {
+			    *(bitmap+m)   = *(image_data+m+2);
+			    *(bitmap+m+1) = *(image_data+m+1);
+			    *(bitmap+m+2) = *(image_data+m);
+			    *(bitmap+m+3) = *(image_data+m+3);
+			}
 		    }
-		}
-	    }
-	}
+		} else {
+		    /* ABGR */
+		    for (row=0, n=0; row<height; row++, n+=bytes_per_row) {
+			for (m=n; m<n+bytes_per_row; m+=4) {
+			    *(bitmap+m)   = *(image_data+m+3);
+			    *(bitmap+m+1) = *(image_data+m+2);
+			    *(bitmap+m+2) = *(image_data+m+1);
+			    *(bitmap+m+3) = *(image_data+m);
+			}
+ 		    }
+ 		}
+ 	    }
 	if (bitmap) {
 	    imagePtr = XCreateImage(display, NULL, depth, format, offset,
 				    (char*)bitmap, width, height, bitmap_pad, bytes_per_row);
-- 
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