/* -*- 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/. */

#ifndef MOZILLA_GFX_WEBRENDERTEXTUREHOST_H

#define MOZILLA_GFX_WEBRENDERTEXTUREHOST_H

#include "mozilla/layers/TextureHost.h"

#include "mozilla/webrender/WebRenderTypes.h"

namespace mozilla {

namespace layers {

class SurfaceDescriptor;

// This textureHost is specialized for WebRender usage. With WebRender, there is

// no Compositor during composition. Instead, we use RendererOGL for composition.

// So, there are some UNREACHABLE asserts for the original Compositor related

// code path in this class. Furthermore, the RendererOGL runs at RenderThead

// instead of Compositor thread. This class is also creating the corresponding

// RenderXXXTextureHost used by RendererOGL at RenderThread.

class WebRenderTextureHost : public TextureHost

{

public:

  WebRenderTextureHost(const SurfaceDescriptor& aDesc,

                       TextureFlags aFlags,

                       TextureHost* aTexture,

                       wr::ExternalImageId& aExternalImageId);

  virtual ~WebRenderTextureHost();

  virtual void DeallocateDeviceData() override {}

  virtual void SetTextureSourceProvider(TextureSourceProvider* aProvider) override;

  virtual bool Lock() override;

  virtual void Unlock() override;

  virtual gfx::SurfaceFormat GetFormat() const override;

  // Return the format used for reading the texture. Some hardware specific

  // textureHosts use their special data representation internally, but we could

  // treat these textureHost as the read-format when we read them.

  // Please check TextureHost::GetReadFormat().

  virtual gfx::SurfaceFormat GetReadFormat() const override;

  virtual bool BindTextureSource(CompositableTextureSourceRef& aTexture) override;

  virtual already_AddRefed<gfx::DataSourceSurface> GetAsSurface() override;

  virtual YUVColorSpace GetYUVColorSpace() const override;

  virtual gfx::IntSize GetSize() const override;

#ifdef MOZ_LAYERS_HAVE_LOG

  virtual const char* Name() override { return "WebRenderTextureHost"; }

#endif

  virtual WebRenderTextureHost* AsWebRenderTextureHost() override { return this; }

  wr::ExternalImageId GetExternalImageKey() { return mExternalImageId; }

  int32_t GetRGBStride();

  virtual uint32_t NumSubTextures() const override;

  virtual void PushResourceUpdates(wr::TransactionBuilder& aResources,

                                   ResourceUpdateOp aOp,

                                   const Range<wr::ImageKey>& aImageKeys,

                                   const wr::ExternalImageId& aExtID) override;

  virtual void PushDisplayItems(wr::DisplayListBuilder& aBuilder,

                                const wr::LayoutRect& aBounds,

                                const wr::LayoutRect& aClip,

                                wr::ImageRendering aFilter,

                                const Range<wr::ImageKey>& aImageKeys) override;

  virtual bool SupportsWrNativeTexture() override;

protected:

  void CreateRenderTextureHost(const SurfaceDescriptor& aDesc, TextureHost* aTexture);

  RefPtr<TextureHost> mWrappedTextureHost;

  wr::ExternalImageId mExternalImageId;

};

} // namespace layers

} // namespace mozilla

#endif // MOZILLA_GFX_WEBRENDERTEXTUREHOST_H