From ab891932cdccbfe32b0c753095f9a871ab30275c Mon Sep 17 00:00:00 2001
From: Artur Wieczorek <artwik@wp.pl>
Date: Thu, 24 Mar 2016 23:00:07 +0100
Subject: [PATCH] Added additional check if source bitmap is valid in
 wxCairoRenderer::CreateSubBitmap.

Check if source bitmap contains Cairo surface.
---
 src/generic/graphicc.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/generic/graphicc.cpp b/src/generic/graphicc.cpp
index 9f3c4b7760..a9f7dc091c 100644
--- a/src/generic/graphicc.cpp
+++ b/src/generic/graphicc.cpp
@@ -2818,6 +2818,8 @@ wxCairoRenderer::CreateSubBitmap(const wxGraphicsBitmap& bitmap,
 
     wxCairoBitmapData* dataSrc = static_cast<wxCairoBitmapData*>(bitmap.GetRefData());
     cairo_surface_t* srcSurface = dataSrc->GetCairoSurface();
+    wxCHECK_MSG(srcSurface, wxNullGraphicsBitmap, wxS("Invalid bitmap"));
+
     int srcWidth = cairo_image_surface_get_width(srcSurface);
     int srcHeight = cairo_image_surface_get_height(srcSurface);