1 files changed, 102 insertions, 0 deletions
diff --git a/gfx/layers/CopyableCanvasLayer.cpp b/gfx/layers/CopyableCanvasLayer.cpp
new file mode 100644
index 000000000..7ec9ce0cd
--- /dev/null
+++ b/gfx/layers/CopyableCanvasLayer.cpp
@@ -0,0 +1,102 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "CopyableCanvasLayer.h"
+
+#include "BasicLayersImpl.h"            // for FillWithMask, etc
+#include "GLContext.h"                  // for GLContext
+#include "GLScreenBuffer.h"             // for GLScreenBuffer
+#include "SharedSurface.h"              // for SharedSurface
+#include "SharedSurfaceGL.h"              // for SharedSurface
+#include "gfxPattern.h"                 // for gfxPattern, etc
+#include "gfxPlatform.h"                // for gfxPlatform, gfxImageFormat
+#include "gfxRect.h"                    // for gfxRect
+#include "gfxUtils.h"                   // for gfxUtils
+#include "gfx2DGlue.h"                  // for thebes --> moz2d transition
+#include "mozilla/gfx/BaseSize.h"       // for BaseSize
+#include "mozilla/gfx/Tools.h"
+#include "mozilla/gfx/Point.h"          // for IntSize
+#include "mozilla/layers/AsyncCanvasRenderer.h"
+#include "mozilla/layers/PersistentBufferProvider.h"
+#include "nsDebug.h"                    // for NS_ASSERTION, NS_WARNING, etc
+#include "nsISupportsImpl.h"            // for gfxContext::AddRef, etc
+#include "nsRect.h"                     // for mozilla::gfx::IntRect
+#include "gfxUtils.h"
+#include "client/TextureClientSharedSurface.h"
+
+namespace mozilla {
+namespace layers {
+
+using namespace mozilla::gfx;
+using namespace mozilla::gl;
+
+CopyableCanvasLayer::CopyableCanvasLayer(LayerManager* aLayerManager, void *aImplData) :
+  CanvasLayer(aLayerManager, aImplData)
+  , mGLFrontbuffer(nullptr)
+  , mIsAlphaPremultiplied(true)
+  , mOriginPos(gl::OriginPos::TopLeft)
+  , mIsMirror(false)
+{
+  MOZ_COUNT_CTOR(CopyableCanvasLayer);
+}
+
+CopyableCanvasLayer::~CopyableCanvasLayer()
+{
+  MOZ_COUNT_DTOR(CopyableCanvasLayer);
+}
+
+void
+CopyableCanvasLayer::Initialize(const Data& aData)
+{
+  if (aData.mGLContext) {
+    mGLContext = aData.mGLContext;
+    mIsAlphaPremultiplied = aData.mIsGLAlphaPremult;
+    mOriginPos = gl::OriginPos::BottomLeft;
+    mIsMirror = aData.mIsMirror;
+
+    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) {
+    mAsyncRenderer = aData.mRenderer;
+    mOriginPos = gl::OriginPos::BottomLeft;
+  } else {
+    MOZ_CRASH("GFX: CanvasLayer created without BufferProvider, DrawTarget or GLContext?");
+  }
+
+  mBounds.SetRect(0, 0, aData.mSize.width, aData.mSize.height);
+}
+
+bool
+CopyableCanvasLayer::IsDataValid(const Data& aData)
+{
+  return mGLContext == aData.mGLContext;
+}
+
+DataSourceSurface*
+CopyableCanvasLayer::GetTempSurface(const IntSize& aSize,
+                                    const SurfaceFormat aFormat)
+{
+  if (!mCachedTempSurface ||
+      aSize != mCachedTempSurface->GetSize() ||
+      aFormat != mCachedTempSurface->GetFormat())
+  {
+    // Create a surface aligned to 8 bytes since that's the highest alignment WebGL can handle.
+    uint32_t stride = GetAlignedStride<8>(aSize.width, BytesPerPixel(aFormat));
+    mCachedTempSurface = Factory::CreateDataSourceSurfaceWithStride(aSize, aFormat, stride);
+  }
+
+  return mCachedTempSurface;
+}
+
+} // namespace layers
+} // namespace mozilla