From b9b1f368fe78f4f52dd355faf9f7c0672659697d Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sat, 7 Feb 2004 15:02:54 +0000
Subject: [PATCH] respect xsrc, ysrc parameters in DoBlit() (patch 733961)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@25560 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/msw/dc.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index d8cc34d86e..0dc13d5a1f 100644
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -2065,10 +2065,19 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
             {
                 StretchBltModeChanger changeMode(GetHdc(), COLORONCOLOR);
 
+                // Figure out what co-ordinate system we're supposed to specify
+                // ysrc in.
+                const LONG hDIB = ds.dsBmih.biHeight;
+                if ( hDIB > 0 )
+                {
+                    // reflect ysrc
+                    ysrc = hDIB - (ysrc + height);
+                }
+
                 if ( ::StretchDIBits(GetHdc(),
                                      xdest, ydest,
                                      width, height,
-                                     0, 0,
+                                     xsrc, ysrc,
                                      width, height,
                                      ds.dsBm.bmBits,
                                      (LPBITMAPINFO)&ds.dsBmih,
-- 
2.50.0