dom/canvas/ImageData.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim:set ts=2 sw=2 et tw=78: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_dom_ImageData_h
   8 #define mozilla_dom_ImageData_h
   9
  10 #include "nsIDOMCanvasRenderingContext2D.h"
  11
  12 #include "mozilla/Attributes.h"
  13 #include "mozilla/dom/BindingUtils.h"
  14 #include "mozilla/dom/TypedArray.h"
  15 #include <stdint.h>
  16
  17 #include "nsCycleCollectionParticipant.h"
  18 #include "nsISupportsImpl.h"
  19 #include "js/GCAPI.h"
  20
  21 namespace mozilla {
  22 namespace dom {
  23
  24 class ImageData MOZ_FINAL : public nsISupports
  25 {
  26   ~ImageData()
  27   {
  28     MOZ_COUNT_DTOR(ImageData);
  29     DropData();
  30   }
  31
  32 public:
  33   ImageData(uint32_t aWidth, uint32_t aHeight, JSObject& aData)
  34     : mWidth(aWidth)
  35     , mHeight(aHeight)
  36     , mData(&aData)
  37   {
  38     MOZ_COUNT_CTOR(ImageData);
  39     HoldData();
  40   }
  41
  42   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  43   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(ImageData)
  44
  45   static already_AddRefed<ImageData>
  46     Constructor(const GlobalObject& aGlobal,
  47                 const uint32_t aWidth,
  48                 const uint32_t aHeight,
  49                 ErrorResult& aRv);
  50
  51   static already_AddRefed<ImageData>
  52     Constructor(const GlobalObject& aGlobal,
  53                 const Uint8ClampedArray& aData,
  54                 const uint32_t aWidth,
  55                 const Optional<uint32_t>& aHeight,
  56                 ErrorResult& aRv);
  57
  58   uint32_t Width() const
  59   {
  60     return mWidth;
  61   }
  62   uint32_t Height() const
  63   {
  64     return mHeight;
  65   }
  66   void GetData(JSContext* cx, JS::MutableHandle<JSObject*> aData) const
  67   {
  68     aData.set(GetDataObject());
  69   }
  70   JSObject* GetDataObject() const
  71   {
  72     JS::ExposeObjectToActiveJS(mData);
  73     return mData;
  74   }
  75
  76   JSObject* WrapObject(JSContext* cx);
  77
  78 private:
  79   void HoldData();
  80   void DropData();
  81
  82   ImageData() = delete;
  83
  84   uint32_t mWidth, mHeight;
  85   JS::Heap<JSObject*> mData;
  86 };
  87
  88 } // namespace dom
  89 } // namespace mozilla
  90
  91 #endif // mozilla_dom_ImageData_h