From b577f3d731b40f87c8c9938127e9f8739cf6eb51 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Mon, 17 Feb 2014 23:53:38 +0000
Subject: [PATCH] Add missing bounding box calculations in wxMSW wxDC code.

Update the bounding box when drawing bitmaps (in one of several possible ways)
and gradients.

Closes #2132.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75909 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/msw/dc.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index 5e2ffe883a..027a82e866 100644
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -1319,7 +1319,11 @@ void wxMSWDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool
         SelectInHDC select(hdcMem, GetHbitmapOf(bmp));
 
         if ( AlphaBlt(this, x, y, width, height, 0, 0, width, height, hdcMem, bmp) )
+        {
+            CalcBoundingBox(x, y);
+            CalcBoundingBox(x + bmp.GetWidth(), y + bmp.GetHeight());
             return;
+        }
     }
 
     SET_STRETCH_BLT_MODE(GetHdc());
@@ -1426,6 +1430,9 @@ void wxMSWDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool
         ::SelectObject( memdc, hOldBitmap );
         ::DeleteDC( memdc );
     }
+
+    CalcBoundingBox(x, y);
+    CalcBoundingBox(x + bmp.GetWidth(), y + bmp.GetHeight());
 }
 
 void wxMSWDCImpl::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
@@ -2209,7 +2216,11 @@ bool wxMSWDCImpl::DoStretchBlit(wxCoord xdest, wxCoord ydest,
     {
         if ( AlphaBlt(this, xdest, ydest, dstWidth, dstHeight,
                       xsrc, ysrc, srcWidth, srcHeight, hdcSrc, bmpSrc) )
+        {
+            CalcBoundingBox(xdest, ydest);
+            CalcBoundingBox(xdest + dstWidth, ydest + dstHeight);
             return true;
+        }
     }
 
     wxMask *mask = NULL;
@@ -2486,6 +2497,12 @@ bool wxMSWDCImpl::DoStretchBlit(wxCoord xdest, wxCoord ydest,
         }
     }
 
+    if ( success )
+    {
+        CalcBoundingBox(xdest, ydest);
+        CalcBoundingBox(xdest + dstWidth, ydest + dstHeight);
+    }
+
     return success;
 }
 
@@ -2911,6 +2928,8 @@ void wxMSWDCImpl::DoGradientFillLinear (const wxRect& rect,
              ) )
         {
             // skip call of the base class version below
+            CalcBoundingBox(rect.GetLeft(), rect.GetBottom());
+            CalcBoundingBox(rect.GetRight(), rect.GetTop());
             return;
         }