From c646ecc0d3e7a2d8385b3fd909f0c08875570807 Mon Sep 17 00:00:00 2001
From: Manolo Gouy <Manolo>
Date: Tue, 1 Mar 2016 15:22:37 +0000
Subject: Have fl_draw_image(buf,X,Y,W,H,D,L) support negative D and/or L
 arguments on Mac OS X - continued.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11255 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/drivers/Quartz/Fl_Quartz_Graphics_Driver_image.cxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src/drivers')

diff --git a/src/drivers/Quartz/Fl_Quartz_Graphics_Driver_image.cxx b/src/drivers/Quartz/Fl_Quartz_Graphics_Driver_image.cxx
index daf26951c..f06333daf 100644
--- a/src/drivers/Quartz/Fl_Quartz_Graphics_Driver_image.cxx
+++ b/src/drivers/Quartz/Fl_Quartz_Graphics_Driver_image.cxx
@@ -55,8 +55,12 @@ static void innards(const uchar *buf, int X, int Y, int W, int H,
 {
   if (!linedelta) linedelta = W*abs(delta);
 
-  const void *array = buf;
   uchar *tmpBuf = 0;
+  if (!cb) {
+    if (delta < 0) buf -= (W-1)*(-delta);
+    if (linedelta < 0) buf -= (H-1)*abs(linedelta);
+  }
+  const void *array = buf;
   if (cb || Fl_Surface_Device::surface() != Fl_Display_Device::display_device()) {
     tmpBuf = new uchar[ H*W*abs(delta) ];
     if (cb) {
-- 
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