Bug 1530471 - remove layers SkiaGL glue r=jrmuizel

Depends on D21054

Differential Revision: https://phabricator.services.mozilla.com/D21055

--HG--
extra : moz-landing-system : lando

gfx/layers/CanvasRenderer.h

@@ -37,7 +37,6 @@ struct CanvasInitializeData {
         mPreTransCallbackData(nullptr),
         mDidTransCallback(nullptr),
         mDidTransCallbackData(nullptr),
-        mFrontbufferGLTex(0),
         mSize(0, 0),
         mHasAlpha(false),
         mIsGLAlphaPremult(true) {}
@@ -54,9 +53,6 @@ struct CanvasInitializeData {
   TransactionCallback mDidTransCallback;
   void* mDidTransCallbackData;
 
-  // Frontbuffer override
-  uint32_t mFrontbufferGLTex;
-
   // The size of the canvas content
   gfx::IntSize mSize;
 

gfx/layers/CopyableCanvasRenderer.cpp

@@ -36,7 +36,6 @@ using namespace mozilla::gl;
 CopyableCanvasRenderer::CopyableCanvasRenderer()
     : mGLContext(nullptr),
       mBufferProvider(nullptr),
-      mGLFrontbuffer(nullptr),
       mAsyncRenderer(nullptr),
       mIsAlphaPremultiplied(true),
       mOriginPos(gl::OriginPos::TopLeft),
@@ -60,12 +59,6 @@ void CopyableCanvasRenderer::Initialize(const CanvasInitializeData& aData) {
 
     MOZ_ASSERT(mGLContext->IsOffscreen(), "canvas gl context isn't offscreen");
 
-    if (aData.mFrontbufferGLTex) {
-      gfx::IntSize size(aData.mSize.width, aData.mSize.height);
-      mGLFrontbuffer = SharedSurface_Basic::Wrap(
-          aData.mGLContext, size, aData.mHasAlpha, aData.mFrontbufferGLTex);
-      mBufferProvider = aData.mBufferProvider;
-    }
   } else if (aData.mBufferProvider) {
     mBufferProvider = aData.mBufferProvider;
   } else if (aData.mRenderer) {
@@ -130,9 +123,7 @@ already_AddRefed<SourceSurface> CopyableCanvasRenderer::ReadbackSurface() {
   }
 
   SharedSurface* frontbuffer = nullptr;
-  if (mGLFrontbuffer) {
-    frontbuffer = mGLFrontbuffer.get();
-  } else if (mGLContext->Screen()) {
+  if (mGLContext->Screen()) {
     const auto& front = mGLContext->Screen()->Front();
     if (front) {
       frontbuffer = front->Surf();

gfx/layers/CopyableCanvasRenderer.h

@@ -57,7 +57,6 @@ class CopyableCanvasRenderer : public CanvasRenderer {
  protected:
   RefPtr<gl::GLContext> mGLContext;
   RefPtr<PersistentBufferProvider> mBufferProvider;
-  UniquePtr<gl::SharedSurface> mGLFrontbuffer;
   RefPtr<AsyncCanvasRenderer> mAsyncRenderer;
 
   bool mIsAlphaPremultiplied;

gfx/layers/ShareableCanvasRenderer.cpp

@@ -41,16 +41,8 @@ void ShareableCanvasRenderer::Initialize(const CanvasInitializeData& aData) {
   if (!mGLContext) return;
 
   gl::GLScreenBuffer* screen = mGLContext->Screen();
-
-  gl::SurfaceCaps caps;
-  if (mGLFrontbuffer) {
-    // The screen caps are irrelevant if we're using a separate frontbuffer.
-    caps = mGLFrontbuffer->mHasAlpha ? gl::SurfaceCaps::ForRGBA()
-                                     : gl::SurfaceCaps::ForRGB();
-  } else {
-    MOZ_ASSERT(screen);
-    caps = screen->mCaps;
-  }
+  MOZ_ASSERT(screen);
+  gl::SurfaceCaps caps = screen->mCaps;
 
   auto forwarder = GetForwarder();
 
@@ -61,17 +53,8 @@ void ShareableCanvasRenderer::Initialize(const CanvasInitializeData& aData) {
 
   UniquePtr<gl::SurfaceFactory> factory =
       gl::GLScreenBuffer::CreateFactory(mGLContext, caps, forwarder, mFlags);
-
-  if (mGLFrontbuffer) {
-    // We're using a source other than the one in the default screen.
-    // (SkiaGL)
-    mFactory = std::move(factory);
-    if (!mFactory) {
-      // Absolutely must have a factory here, so create a basic one
-      mFactory = MakeUnique<gl::SurfaceFactory_Basic>(mGLContext, caps, mFlags);
-    }
-  } else {
-    if (factory) screen->Morph(std::move(factory));
+  if (factory) {
+    screen->Morph(std::move(factory));
   }
 }
 
@@ -122,14 +105,11 @@ bool ShareableCanvasRenderer::UpdateTarget(DrawTarget* aDestTarget) {
   }
 
   gl::SharedSurface* frontbuffer = nullptr;
-  if (mGLFrontbuffer) {
-    frontbuffer = mGLFrontbuffer.get();
-  } else {
-    gl::GLScreenBuffer* screen = mGLContext->Screen();
-    const auto& front = screen->Front();
-    if (front) {
-      frontbuffer = front->Surf();
-    }
+
+  gl::GLScreenBuffer* screen = mGLContext->Screen();
+  const auto& front = screen->Front();
+  if (front) {
+    frontbuffer = front->Surf();
   }
 
   if (!frontbuffer) {

gfx/layers/client/CanvasClient.cpp

@@ -385,14 +385,7 @@ void CanvasClientSharedSurface::UpdateRenderer(gfx::IntSize aSize,
   RefPtr<TextureClient> newFront;
 
   mShSurfClient = nullptr;
-  if (canvasRenderer && canvasRenderer->mGLFrontbuffer) {
-    mShSurfClient = CloneSurface(canvasRenderer->mGLFrontbuffer.get(),
-                                 canvasRenderer->mFactory.get());
-    if (!mShSurfClient) {
-      gfxCriticalError() << "Invalid canvas front buffer";
-      return;
-    }
-  } else if (gl->Screen()) {
+  if (gl->Screen()) {
     mShSurfClient = gl->Screen()->Front();
     if (mShSurfClient && mShSurfClient->GetAllocator() &&
         mShSurfClient->GetAllocator() !=