[CherryPick] TextureMapperSurfaceBackingStore should check if GraphicsSurface is...

[Title] [CherryPick] TextureMapperSurfaceBackingStore should check if GraphicsSurface is valid.
[Issues] N_SE-32071
[Problem] Force close occurred when tapped on the "full screen view" button of Video Test of TizenWinset.
[Solution] Cherry picked.

https://bugs.webkit.org/show_bug.cgi?id=100002

Reviewed by Kenneth Rohde Christiansen.

* platform/graphics/texmap/TextureMapperBackingStore.cpp:
(WebCore::TextureMapperSurfaceBackingStore::setGraphicsSurface):
    Check if a surface has been created before accessing the pointer.
(WebCore::TextureMapperSurfaceBackingStore::paintToTextureMapper):
    Check if m_graphicsSurface is a valid pointer before dereferencing it.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@132118 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Conflicts:

	Source/WebCore/ChangeLog
	Source/WebCore/platform/graphics/texmap/TextureMapperBackingStore.cpp

Change-Id: Icbe5b6d139304cc3671be06249538a839112a731

diff --git a/Source/WebCore/platform/graphics/texmap/TextureMapperBackingStore.cpp b/Source/WebCore/platform/graphics/texmap/TextureMapperBackingStore.cpp
index 8ab1625..b799d79 100755 (executable)
--- a/Source/WebCore/platform/graphics/texmap/TextureMapperBackingStore.cpp
+++ b/Source/WebCore/platform/graphics/texmap/TextureMapperBackingStore.cpp
@@ -73,7 +73,8 @@ PassRefPtr<BitmapTexture> TextureMapperSurfaceBackingStore::texture() const
 
 void TextureMapperSurfaceBackingStore::paintToTextureMapper(TextureMapper* textureMapper, const FloatRect& targetRect, const TransformationMatrix& transform, float opacity)
 {
-    m_graphicsSurface->paintToTextureMapper(textureMapper, targetRect, transform, opacity);
+    if (m_graphicsSurface)
+        m_graphicsSurface->paintToTextureMapper(textureMapper, targetRect, transform, opacity);
 }
 
 void TextureMapperSurfaceBackingStore::setSurface(PassRefPtr<GraphicsSurface> surface)