/* -*- 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