content/canvas/src/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 <stdint.h>
  14
  15 #include "nsCycleCollectionParticipant.h"
  16 #include "nsTraceRefcnt.h"
  17 #include "js/GCAPI.h"
  18
  19 namespace mozilla {
  20 namespace dom {
  21
  22 class ImageData MOZ_FINAL : public nsISupports
  23 {
  24 public:
  25   ImageData(uint32_t aWidth, uint32_t aHeight, JSObject& aData)
  26     : mWidth(aWidth)
  27     , mHeight(aHeight)
  28     , mData(&aData)
  29   {
  30     MOZ_COUNT_CTOR(ImageData);
  31     HoldData();
  32   }
  33
  34   ~ImageData()
  35   {
  36     MOZ_COUNT_DTOR(ImageData);
  37     DropData();
  38   }
  39
  40   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  41   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(ImageData)
  42
  43   uint32_t Width() const
  44   {
  45     return mWidth;
  46   }
  47   uint32_t Height() const
  48   {
  49     return mHeight;
  50   }
  51   JSObject* Data(JSContext* cx) const
  52   {
  53     return GetDataObject();
  54   }
  55   JSObject* GetDataObject() const
  56   {
  57     JS::ExposeObjectToActiveJS(mData);
  58     return mData;
  59   }
  60
  61   JSObject* WrapObject(JSContext* cx, JS::Handle<JSObject*> scope);
  62
  63 private:
  64   void HoldData();
  65   void DropData();
  66
  67   ImageData() MOZ_DELETE;
  68
  69   uint32_t mWidth, mHeight;
  70   JS::Heap<JSObject*> mData;
  71 };
  72
  73 } // namespace dom
  74 } // namespace mozilla
  75
  76 #endif // mozilla_dom_ImageData_h