Bug 991575 - Stop PresShell::GetReferenceRenderingContext from creating a Thebes backed gfxContext (Moz2D migration). r=mattwoodrow

gfx/src/nsRenderingContext.cpp

@@ -83,6 +83,13 @@ nsRenderingContext::Init(nsDeviceContext* aContext,
     mP2A = mDeviceContext->AppUnitsPerDevPixel();
 }
 
+void
+nsRenderingContext::Init(nsDeviceContext* aContext,
+                         DrawTarget* aDrawTarget)
+{
+  Init(aContext, new gfxContext(aDrawTarget));
+}
+
 //
 // graphics state
 //

gfx/src/nsRenderingContext.h

@@ -48,6 +48,7 @@ public:
 
     void Init(nsDeviceContext* aContext, gfxASurface* aThebesSurface);
     void Init(nsDeviceContext* aContext, gfxContext* aThebesContext);
+    void Init(nsDeviceContext* aContext, DrawTarget* aDrawTarget);
 
     // These accessors will never return null.
     gfxContext *ThebesContext() { return mThebes; }

layout/base/nsPresShell.cpp

@@ -2901,7 +2901,7 @@ PresShell::GetReferenceRenderingContext()
   nsRefPtr<nsRenderingContext> rc;
   if (mPresContext->IsScreen()) {
     rc = new nsRenderingContext();
-    rc->Init(devCtx, gfxPlatform::GetPlatform()->ScreenReferenceSurface());
+    rc->Init(devCtx, gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget());
   } else {
     devCtx->CreateRenderingContext(*getter_AddRefs(rc));
   }