1 files changed, 141 insertions, 0 deletions
diff --git a/gfx/layers/basic/BasicCanvasLayer.cpp b/gfx/layers/basic/BasicCanvasLayer.cpp
new file mode 100644
index 000000000..83c5c272e
--- /dev/null
+++ b/gfx/layers/basic/BasicCanvasLayer.cpp
@@ -0,0 +1,141 @@
+/* -*- 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 "BasicCanvasLayer.h"
+#include "AsyncCanvasRenderer.h"
+#include "basic/BasicLayers.h"          // for BasicLayerManager
+#include "basic/BasicLayersImpl.h"      // for GetEffectiveOperator
+#include "mozilla/mozalloc.h"           // for operator new
+#include "nsCOMPtr.h"                   // for already_AddRefed
+#include "nsISupportsImpl.h"            // for Layer::AddRef, etc
+#include "gfx2DGlue.h"
+#include "GLScreenBuffer.h"
+#include "GLContext.h"
+#include "gfxUtils.h"
+#include "mozilla/layers/PersistentBufferProvider.h"
+#include "client/TextureClientSharedSurface.h"
+
+class gfxContext;
+
+using namespace mozilla::gfx;
+using namespace mozilla::gl;
+
+namespace mozilla {
+namespace layers {
+
+already_AddRefed<SourceSurface>
+BasicCanvasLayer::UpdateSurface()
+{
+  if (mAsyncRenderer) {
+    MOZ_ASSERT(!mBufferProvider);
+    MOZ_ASSERT(!mGLContext);
+    return mAsyncRenderer->GetSurface();
+  }
+
+  if (!mGLContext) {
+    return nullptr;
+  }
+
+  SharedSurface* frontbuffer = nullptr;
+  if (mGLFrontbuffer) {
+    frontbuffer = mGLFrontbuffer.get();
+  } else {
+    GLScreenBuffer* screen = mGLContext->Screen();
+    const auto& front = screen->Front();
+    if (front) {
+      frontbuffer = front->Surf();
+    }
+  }
+
+  if (!frontbuffer) {
+    NS_WARNING("Null frame received.");
+    return nullptr;
+  }
+
+  IntSize readSize(frontbuffer->mSize);
+  SurfaceFormat format = (GetContentFlags() & CONTENT_OPAQUE)
+                          ? SurfaceFormat::B8G8R8X8
+                          : SurfaceFormat::B8G8R8A8;
+  bool needsPremult = frontbuffer->mHasAlpha && !mIsAlphaPremultiplied;
+
+  RefPtr<DataSourceSurface> resultSurf = GetTempSurface(readSize, format);
+  // There will already be a warning from inside of GetTempSurface, but
+  // it doesn't hurt to complain:
+  if (NS_WARN_IF(!resultSurf)) {
+    return nullptr;
+  }
+
+  // Readback handles Flush/MarkDirty.
+  mGLContext->Readback(frontbuffer, resultSurf);
+  if (needsPremult) {
+    gfxUtils::PremultiplyDataSurface(resultSurf, resultSurf);
+  }
+  MOZ_ASSERT(resultSurf);
+
+  return resultSurf.forget();
+}
+
+void
+BasicCanvasLayer::Paint(DrawTarget* aDT,
+                        const Point& aDeviceOffset,
+                        Layer* aMaskLayer)
+{
+  if (IsHidden())
+    return;
+
+  RefPtr<SourceSurface> surface;
+  if (IsDirty()) {
+    Painted();
+
+    FirePreTransactionCallback();
+    surface = UpdateSurface();
+    FireDidTransactionCallback();
+  }
+
+  bool bufferPoviderSnapshot = false;
+  if (!surface && mBufferProvider) {
+    surface = mBufferProvider->BorrowSnapshot();
+    bufferPoviderSnapshot = !!surface;
+  }
+
+  if (!surface) {
+    return;
+  }
+
+  const bool needsYFlip = (mOriginPos == gl::OriginPos::BottomLeft);
+
+  Matrix oldTM;
+  if (needsYFlip) {
+    oldTM = aDT->GetTransform();
+    aDT->SetTransform(Matrix(oldTM).
+                        PreTranslate(0.0f, mBounds.height).
+                        PreScale(1.0f, -1.0f));
+  }
+
+  FillRectWithMask(aDT, aDeviceOffset,
+                   Rect(0, 0, mBounds.width, mBounds.height),
+                   surface, mSamplingFilter,
+                   DrawOptions(GetEffectiveOpacity(), GetEffectiveOperator(this)),
+                   aMaskLayer);
+
+  if (needsYFlip) {
+    aDT->SetTransform(oldTM);
+  }
+
+  if (bufferPoviderSnapshot) {
+    mBufferProvider->ReturnSnapshot(surface.forget());
+  }
+}
+
+already_AddRefed<CanvasLayer>
+BasicLayerManager::CreateCanvasLayer()
+{
+  NS_ASSERTION(InConstruction(), "Only allowed in construction phase");
+  RefPtr<CanvasLayer> layer = new BasicCanvasLayer(this);
+  return layer.forget();
+}
+
+} // namespace layers
+} // namespace mozilla