CanvasRenderingContextHelper.h

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/* -*- 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/. */

#ifndef MOZILLA_DOM_CANVASRENDERINGCONTEXTHELPER_H_

#define MOZILLA_DOM_CANVASRENDERINGCONTEXTHELPER_H_

#include "mozilla/UniquePtr.h"

#include "mozilla/dom/BindingDeclarations.h"

#include "mozilla/gfx/Point.h"

#include "mozilla/layers/LayersTypes.h"

#include "nsSize.h"

class nsICanvasRenderingContextInternal;

class nsIGlobalObject;

namespace mozilla {

class ErrorResult;

namespace dom {

class BlobCallback;

class EncodeCompleteCallback;

enum class CanvasContextType : uint8_t {

  NoContext,

  Canvas2D,

  OffscreenCanvas2D,

  WebGL1,

  WebGL2,

  WebGPU,

  ImageBitmap

};

/**

 * Povides common RenderingContext functionality used by both OffscreenCanvas

 * and HTMLCanvasElement.

*/

class CanvasRenderingContextHelper {

 public:

  CanvasRenderingContextHelper();

  virtual bool GetOpaqueAttr() = 0;

 protected:

  virtual nsresult UpdateContext(JSContext* aCx,

                                 JS::Handle<JS::Value> aNewContextOptions,

                                 ErrorResult& aRvForDictionaryInit);

  virtual nsresult ParseParams(JSContext* aCx, const nsAString& aType,

                               const JS::Value& aEncoderOptions,

                               nsAString& outParams,

                               bool* const outCustomParseOptions);

  void ToBlob(JSContext* aCx, nsIGlobalObject* global, BlobCallback& aCallback,

              const nsAString& aType, JS::Handle<JS::Value> aParams,

              bool aUsePlaceholder, ErrorResult& aRv);

  void ToBlob(JSContext* aCx, EncodeCompleteCallback* aCallback,

              const nsAString& aType, JS::Handle<JS::Value> aParams,

              bool aUsePlaceholder, ErrorResult& aRv);

  void ToBlob(EncodeCompleteCallback* aCallback, nsAString& aType,

              const nsAString& aEncodeOptions, bool aUsingCustomOptions,

              bool aUsePlaceholder, ErrorResult& aRv);

  virtual UniquePtr<uint8_t[]> GetImageBuffer(int32_t* aOutFormat,

                                              gfx::IntSize* aOutImageSize);

  already_AddRefed<nsISupports> GetOrCreateContext(

      JSContext* aCx, const nsAString& aContextId,

      JS::Handle<JS::Value> aContextOptions, ErrorResult& aRv);

  already_AddRefed<nsISupports> GetOrCreateContext(

      JSContext* aCx, CanvasContextType aContextType,

      JS::Handle<JS::Value> aContextOptions, ErrorResult& aRv);

  virtual already_AddRefed<nsICanvasRenderingContextInternal> CreateContext(

      CanvasContextType aContextType);

  already_AddRefed<nsICanvasRenderingContextInternal> CreateContextHelper(

      CanvasContextType aContextType, layers::LayersBackend aCompositorBackend);

  virtual nsIntSize GetWidthHeight() = 0;

  CanvasContextType mCurrentContextType;

  nsCOMPtr<nsICanvasRenderingContextInternal> mCurrentContext;

};

}  // namespace dom

namespace CanvasUtils {

bool GetCanvasContextType(const nsAString&, dom::CanvasContextType* const);

}  // namespace CanvasUtils

}  // namespace mozilla

#endif  // MOZILLA_DOM_CANVASRENDERINGCONTEXTHELPER_H_