diff --git a/gfx/layers/Compositor.h b/gfx/layers/Compositor.h
index 7f148973f125..4386d66852b9 100644
--- a/gfx/layers/Compositor.h
+++ b/gfx/layers/Compositor.h
@@ -125,8 +125,7 @@ class CompositingRenderTarget;
 enum SurfaceInitMode
 {
   INIT_MODE_NONE,
-  INIT_MODE_CLEAR,
-  INIT_MODE_COPY
+  INIT_MODE_CLEAR
 };
 
 /**
diff --git a/gfx/layers/basic/BasicCompositor.cpp b/gfx/layers/basic/BasicCompositor.cpp
index a263b055377b..442f0a60b856 100644
--- a/gfx/layers/basic/BasicCompositor.cpp
+++ b/gfx/layers/basic/BasicCompositor.cpp
@@ -250,7 +250,6 @@ void BasicCompositor::Destroy()
 TemporaryRef<CompositingRenderTarget>
 BasicCompositor::CreateRenderTarget(const IntRect& aRect, SurfaceInitMode aInit)
 {
-  MOZ_ASSERT(aInit != INIT_MODE_COPY);
   RefPtr<DrawTarget> target = mDrawTarget->CreateSimilarDrawTarget(aRect.Size(), FORMAT_B8G8R8A8);
 
   RefPtr<BasicCompositingRenderTarget> rt = new BasicCompositingRenderTarget(target, aRect.Size());
diff --git a/gfx/layers/composite/ContainerLayerComposite.cpp b/gfx/layers/composite/ContainerLayerComposite.cpp
index 8bdbd855343f..3171643be794 100644
--- a/gfx/layers/composite/ContainerLayerComposite.cpp
+++ b/gfx/layers/composite/ContainerLayerComposite.cpp
@@ -131,9 +131,7 @@ ContainerRender(ContainerT* aContainer,
       // not safe.
       if (HasOpaqueAncestorLayer(aContainer) &&
           transform3D.Is2D(&transform) && !transform.HasNonIntegerTranslation()) {
-        mode = gfxPlatform::ComponentAlphaEnabled() ?
-                                            INIT_MODE_COPY : INIT_MODE_CLEAR;
-        surfaceCopyNeeded = (mode == INIT_MODE_COPY);
+        surfaceCopyNeeded = gfxPlatform::ComponentAlphaEnabled();
         surfaceRect.x += transform.x0;
         surfaceRect.y += transform.y0;
         aContainer->mSupportsComponentAlphaChildren
diff --git a/gfx/layers/opengl/CompositorOGL.cpp b/gfx/layers/opengl/CompositorOGL.cpp
index 55f3f1306ae5..d8f835783fd6 100644
--- a/gfx/layers/opengl/CompositorOGL.cpp
+++ b/gfx/layers/opengl/CompositorOGL.cpp
@@ -659,7 +659,7 @@ CompositorOGL::CreateRenderTarget(const IntRect &aRect, SurfaceInitMode aInit)
 {
   GLuint tex = 0;
   GLuint fbo = 0;
-  CreateFBOWithTexture(aRect, aInit, 0, &fbo, &tex);
+  CreateFBOWithTexture(aRect, false, 0, &fbo, &tex);
   RefPtr<CompositingRenderTargetOGL> surface
     = new CompositingRenderTargetOGL(this, tex, fbo);
   surface->Initialize(IntSize(aRect.width, aRect.height), mFBOTextureTarget, aInit);
@@ -675,10 +675,10 @@ CompositorOGL::CreateRenderTargetFromSource(const IntRect &aRect,
   const CompositingRenderTargetOGL* sourceSurface
     = static_cast<const CompositingRenderTargetOGL*>(aSource);
   if (aSource) {
-    CreateFBOWithTexture(aRect, INIT_MODE_COPY, sourceSurface->GetFBO(),
+    CreateFBOWithTexture(aRect, true, sourceSurface->GetFBO(),
                          &fbo, &tex);
   } else {
-    CreateFBOWithTexture(aRect, INIT_MODE_COPY, 0,
+    CreateFBOWithTexture(aRect, true, 0,
                          &fbo, &tex);
   }
 
@@ -686,7 +686,7 @@ CompositorOGL::CreateRenderTargetFromSource(const IntRect &aRect,
     = new CompositingRenderTargetOGL(this, tex, fbo);
   surface->Initialize(IntSize(aRect.width, aRect.height),
                       mFBOTextureTarget,
-                      INIT_MODE_COPY);
+                      INIT_MODE_NONE);
   return surface.forget();
 }
 
@@ -841,7 +841,7 @@ CompositorOGL::BeginFrame(const Rect *aClipRectIn, const gfxMatrix& aTransform,
 }
 
 void
-CompositorOGL::CreateFBOWithTexture(const IntRect& aRect, SurfaceInitMode aInit,
+CompositorOGL::CreateFBOWithTexture(const IntRect& aRect, bool aCopyFromSource,
                                     GLuint aSourceFrameBuffer,
                                     GLuint *aFBO, GLuint *aTexture)
 {
@@ -851,7 +851,7 @@ CompositorOGL::CreateFBOWithTexture(const IntRect& aRect, SurfaceInitMode aInit,
   mGLContext->fGenTextures(1, &tex);
   mGLContext->fBindTexture(mFBOTextureTarget, tex);
 
-  if (aInit == INIT_MODE_COPY) {
+  if (aCopyFromSource) {
     GLuint curFBO = mCurrentRenderTarget->GetFBO();
     if (curFBO != aSourceFrameBuffer) {
       mGLContext->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, aSourceFrameBuffer);
diff --git a/gfx/layers/opengl/CompositorOGL.h b/gfx/layers/opengl/CompositorOGL.h
index c5c98a17ba38..be1ace30e4c5 100644
--- a/gfx/layers/opengl/CompositorOGL.h
+++ b/gfx/layers/opengl/CompositorOGL.h
@@ -274,7 +274,7 @@ private:
    * shaders are required to sample from the different
    * texture types.
    */
-  void CreateFBOWithTexture(const gfx::IntRect& aRect, SurfaceInitMode aInit,
+  void CreateFBOWithTexture(const gfx::IntRect& aRect, bool aCopyFromSource,
                             GLuint aSourceFrameBuffer,
                             GLuint *aFBO, GLuint *aTexture);