/* -*- 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 "WebRenderCanvasLayer.h"

#include "AsyncCanvasRenderer.h"
#include "gfxUtils.h"
#include "GLContext.h"
#include "GLScreenBuffer.h"
#include "LayersLogging.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/layers/TextureClientSharedSurface.h"
#include "mozilla/layers/WebRenderBridgeChild.h"
#include "PersistentBufferProvider.h"
#include "SharedSurface.h"
#include "SharedSurfaceGL.h"
#include "mozilla/webrender/WebRenderTypes.h"

namespace mozilla {
namespace layers {

WebRenderCanvasLayer::~WebRenderCanvasLayer()
{
  MOZ_COUNT_DTOR(WebRenderCanvasLayer);

  if (mExternalImageId) {
    WrBridge()->DeallocExternalImageId(mExternalImageId);
  }
}

void
WebRenderCanvasLayer::Initialize(const Data& aData)
{
  ShareableCanvasLayer::Initialize(aData);

  // XXX: Use basic surface factory until we support shared surface.
  if (!mGLContext || mGLFrontbuffer)
    return;

  gl::GLScreenBuffer* screen = mGLContext->Screen();
  auto factory = MakeUnique<gl::SurfaceFactory_Basic>(mGLContext, screen->mCaps, mFlags);
  screen->Morph(Move(factory));
}

void
WebRenderCanvasLayer::RenderLayer()
{
  UpdateCompositableClient();

  if (!mExternalImageId) {
    mExternalImageId = WrBridge()->AllocExternalImageIdForCompositable(mCanvasClient);
  }

  MOZ_ASSERT(mExternalImageId);

  gfx::Matrix4x4 transform;// = GetTransform();
  const bool needsYFlip = (mOriginPos == gl::OriginPos::BottomLeft);
  if (needsYFlip) {
    transform.PreTranslate(0, mBounds.height, 0).PreScale(1, -1, 1);
  }
  gfx::Rect rect(0, 0, mBounds.width, mBounds.height);
  rect = RelativeToTransformedVisible(GetTransform().TransformBounds(rect));

  gfx::Rect clip;
  if (GetClipRect().isSome()) {
      clip = RelativeToTransformedVisible(IntRectToRect(GetClipRect().ref().ToUnknownRect()));
  } else {
      clip = rect;
  }

  if (gfxPrefs::LayersDump()) printf_stderr("CanvasLayer %p using rect:%s clip:%s\n", this, Stringify(rect).c_str(), Stringify(clip).c_str());

  gfx::Rect relBounds = TransformedVisibleBoundsRelativeToParent();
  gfx::Rect overflow(0, 0, relBounds.width, relBounds.height);
  Maybe<WrImageMask> mask = buildMaskLayer();
  WrTextureFilter filter = (mSamplingFilter == gfx::SamplingFilter::POINT) ? WrTextureFilter::Point : WrTextureFilter::Linear;
  WrMixBlendMode mixBlendMode = wr::ToWrMixBlendMode(GetMixBlendMode());

  WrBridge()->AddWebRenderCommand(
      OpDPPushStackingContext(wr::ToWrRect(relBounds),
                              wr::ToWrRect(overflow),
                              mask,
                              GetAnimations(),
                              transform,
                              mixBlendMode,
                              FrameMetrics::NULL_SCROLL_ID));
  WrBridge()->AddWebRenderCommand(OpDPPushExternalImageId(LayerIntRegion(), wr::ToWrRect(rect), wr::ToWrRect(clip), Nothing(), filter, mExternalImageId));
  WrBridge()->AddWebRenderCommand(OpDPPopStackingContext());

  if (gfxPrefs::LayersDump()) printf_stderr("CanvasLayer %p using %s as bounds/overflow, %s for transform\n", this, Stringify(relBounds).c_str(), Stringify(transform).c_str());
}

void
WebRenderCanvasLayer::AttachCompositable()
{
  mCanvasClient->Connect();
}

} // namespace layers
} // namespace mozilla