зеркало из https://github.com/mozilla/gecko-dev.git
143 строки
4.0 KiB
C++
143 строки
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_GFX_CANVASCLIENT_H
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#define MOZILLA_GFX_CANVASCLIENT_H
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#include "mozilla/Assertions.h" // for MOZ_ASSERT, etc
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#include "mozilla/Attributes.h" // for override
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#include "mozilla/RefPtr.h" // for RefPtr, already_AddRefed
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#include "mozilla/layers/CompositableClient.h" // for CompositableClient
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#include "mozilla/layers/CompositorTypes.h" // for TextureInfo, etc
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#include "mozilla/layers/LayersSurfaces.h" // for SurfaceDescriptor
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#include "mozilla/layers/TextureClient.h" // for TextureClient, etc
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#include "mozilla/mozalloc.h" // for operator delete
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#include "mozilla/gfx/Point.h" // for IntSize
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#include "mozilla/gfx/Types.h" // for SurfaceFormat
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namespace mozilla {
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namespace layers {
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class ClientCanvasLayer;
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class CompositableForwarder;
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class SharedSurfaceTextureClient;
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/**
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* Compositable client for 2d and webgl canvas.
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*/
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class CanvasClient : public CompositableClient
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{
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public:
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/**
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* Creates, configures, and returns a new canvas client. If necessary, a
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* message will be sent to the compositor to create a corresponding image
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* host.
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*/
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enum CanvasClientType {
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CanvasClientSurface,
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CanvasClientGLContext,
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CanvasClientTypeShSurf,
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};
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static already_AddRefed<CanvasClient> CreateCanvasClient(CanvasClientType aType,
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CompositableForwarder* aFwd,
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TextureFlags aFlags);
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CanvasClient(CompositableForwarder* aFwd, TextureFlags aFlags)
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: CompositableClient(aFwd, aFlags)
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{
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mTextureFlags = aFlags;
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}
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virtual ~CanvasClient() {}
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virtual void Clear() {};
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virtual void Update(gfx::IntSize aSize, ClientCanvasLayer* aLayer) = 0;
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virtual void Updated() { }
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};
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// Used for 2D canvases and WebGL canvas on non-GL systems where readback is requried.
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class CanvasClient2D : public CanvasClient
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{
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public:
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CanvasClient2D(CompositableForwarder* aLayerForwarder,
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TextureFlags aFlags)
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: CanvasClient(aLayerForwarder, aFlags)
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{
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}
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TextureInfo GetTextureInfo() const override
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{
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return TextureInfo(CompositableType::IMAGE, mTextureFlags);
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}
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virtual void Clear() override
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{
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mBuffer = nullptr;
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}
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virtual void Update(gfx::IntSize aSize, ClientCanvasLayer* aLayer) override;
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virtual bool AddTextureClient(TextureClient* aTexture) override
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{
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MOZ_ASSERT((mTextureFlags & aTexture->GetFlags()) == mTextureFlags);
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return CompositableClient::AddTextureClient(aTexture);
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}
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virtual void OnDetach() override
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{
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mBuffer = nullptr;
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}
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private:
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already_AddRefed<TextureClient>
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CreateTextureClientForCanvas(gfx::SurfaceFormat aFormat,
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gfx::IntSize aSize,
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TextureFlags aFlags,
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ClientCanvasLayer* aLayer);
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RefPtr<TextureClient> mBuffer;
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};
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// Used for GL canvases where we don't need to do any readback, i.e., with a
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// GL backend.
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class CanvasClientSharedSurface : public CanvasClient
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{
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private:
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RefPtr<SharedSurfaceTextureClient> mShSurfClient;
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RefPtr<TextureClient> mReadbackClient;
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RefPtr<TextureClient> mFront;
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void ClearSurfaces();
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public:
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CanvasClientSharedSurface(CompositableForwarder* aLayerForwarder,
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TextureFlags aFlags);
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~CanvasClientSharedSurface();
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virtual TextureInfo GetTextureInfo() const override {
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return TextureInfo(CompositableType::IMAGE);
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}
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virtual void Clear() override {
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ClearSurfaces();
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}
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virtual void Update(gfx::IntSize aSize,
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ClientCanvasLayer* aLayer) override;
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virtual void OnDetach() override {
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ClearSurfaces();
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}
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};
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} // namespace layers
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} // namespace mozilla
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#endif
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