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 ImageData* Constructor(const GlobalObject& aGlobal,
  46                                 const uint32_t aWidth,
  47                                 const uint32_t aHeight,
  48                                 ErrorResult& aRv);
  49
  50   static ImageData* Constructor(const GlobalObject& aGlobal,
  51                                 const Uint8ClampedArray& aData,
  52                                 const uint32_t aWidth,
  53                                 const Optional<uint32_t>& aHeight,
  54                                 ErrorResult& aRv);
  55
  56   uint32_t Width() const
  57   {
  58     return mWidth;
  59   }
  60   uint32_t Height() const
  61   {
  62     return mHeight;
  63   }
  64   void GetData(JSContext* cx, JS::MutableHandle<JSObject*> aData) const
  65   {
  66     aData.set(GetDataObject());
  67   }
  68   JSObject* GetDataObject() const
  69   {
  70     JS::ExposeObjectToActiveJS(mData);
  71     return mData;
  72   }
  73
  74   JSObject* WrapObject(JSContext* cx);
  75
  76 private:
  77   void HoldData();
  78   void DropData();
  79
  80   ImageData() MOZ_DELETE;
  81
  82   uint32_t mWidth, mHeight;
  83   JS::Heap<JSObject*> mData;
  84 };
  85
  86 } // namespace dom
  87 } // namespace mozilla
  88
  89 #endif // mozilla_dom_ImageData_h