/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "CopyableCanvasRenderer.h"
#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 {

void BasicCanvasLayer::Paint(DrawTarget* aDT, const Point& aDeviceOffset,
                             Layer* aMaskLayer) {
  if (IsHidden()) return;

  RefPtr<SourceSurface> surface;
  CopyableCanvasRenderer* canvasRenderer =
      mCanvasRenderer->AsCopyableCanvasRenderer();
  MOZ_ASSERT(canvasRenderer);
  if (IsDirty()) {
    Painted();

    surface = canvasRenderer->ReadbackSurface();
  }

  bool bufferPoviderSnapshot = false;
  PersistentBufferProvider* bufferProvider =
      canvasRenderer->GetBufferProvider();
  if (!surface && bufferProvider) {
    surface = bufferProvider->BorrowSnapshot();
    bufferPoviderSnapshot = !!surface;
  }

  if (!surface) {
    return;
  }

  Matrix oldTM;
  if (canvasRenderer->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 (canvasRenderer->NeedsYFlip()) {
    aDT->SetTransform(oldTM);
  }

  if (bufferPoviderSnapshot) {
    bufferProvider->ReturnSnapshot(surface.forget());
  }
}

CanvasRenderer* BasicCanvasLayer::CreateCanvasRendererInternal() {
  return new CopyableCanvasRenderer();
}

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