/* -*- Mode: C++; tab-width: 20; 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 "mozilla/layers/CanvasClient.h"
#include "mozilla/layers/TextureClient.h"
#include "BasicCanvasLayer.h"
#include "mozilla/layers/ShadowLayers.h"
#include "SharedTextureImage.h"
#include "nsXULAppAPI.h"
#include "GLContext.h"
#include "SurfaceStream.h"

using namespace mozilla::gl;

namespace mozilla {
namespace layers {

/* static */ TemporaryRef<CanvasClient>
CanvasClient::CreateCanvasClient(LayersBackend aParentBackend,
                                 CompositableType aCompositableHostType,
                                 CompositableForwarder* aForwarder,
                                 TextureFlags aFlags)
{
  if (aCompositableHostType == BUFFER_IMAGE_SINGLE) {
    return new CanvasClient2D(aForwarder, aFlags);
  }
  if (aCompositableHostType == BUFFER_IMAGE_BUFFERED) {
    if (aParentBackend == LAYERS_OPENGL) {
      return new CanvasClientWebGL(aForwarder, aFlags);
    }
    return new CanvasClient2D(aForwarder, aFlags);
  }
  return nullptr;
}

void
CanvasClient::SetBuffer(const TextureIdentifier& aTextureIdentifier,
                        const SurfaceDescriptor& aBuffer)
{
  mTextureClient->SetDescriptor(aBuffer);
}

CanvasClient2D::CanvasClient2D(CompositableForwarder* aFwd,
                               TextureFlags aFlags)
: CanvasClient(aFwd, aFlags)
{
}

void
CanvasClient2D::Update(gfx::IntSize aSize, BasicCanvasLayer* aLayer)
{
  if (!mTextureClient) {
    mTextureClient = CreateTextureClient(TEXTURE_SHMEM, mFlags);
  }

  bool isOpaque = (aLayer->GetContentFlags() & Layer::CONTENT_OPAQUE);
  gfxASurface::gfxContentType contentType = isOpaque
                                              ? gfxASurface::CONTENT_COLOR
                                              : gfxASurface::CONTENT_COLOR_ALPHA;
  mTextureClient->EnsureAllocated(aSize, contentType);

  gfxASurface* surface = mTextureClient->LockSurface();
  static_cast<BasicCanvasLayer*>(aLayer)->UpdateSurface(surface, nullptr);
  mTextureClient->Unlock();
}

CanvasClientWebGL::CanvasClientWebGL(CompositableForwarder* aFwd,
                                     TextureFlags aFlags)
: CanvasClient(aFwd, aFlags)
{
}

void
CanvasClientWebGL::Update(gfx::IntSize aSize, BasicCanvasLayer* aLayer)
{
  if (!mTextureClient) {
    mTextureClient = CreateTextureClient(TEXTURE_STREAM_GL, mFlags);
  }

  NS_ASSERTION(aLayer->mGLContext, "CanvasClientWebGL should only be used with GL canvases");

  // the content type won't be used
  mTextureClient->EnsureAllocated(aSize, gfxASurface::CONTENT_COLOR);

  GLScreenBuffer* screen = aLayer->mGLContext->Screen();
  SurfaceStreamHandle handle = screen->Stream()->GetShareHandle();

  mTextureClient->SetDescriptor(SurfaceStreamDescriptor(handle, false));

  aLayer->Painted();
}

}
}