image/src/ImageMetadata.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   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
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/StandardInteger.h"
   8 #include "mozilla/Util.h"
   9 #include "nsSize.h"
  10
  11 namespace mozilla {
  12 namespace image {
  13
  14 class RasterImage;
  15
  16 // The metadata about an image that decoders accumulate as they decode.
  17 class ImageMetadata
  18 {
  19 public:
  20   ImageMetadata()
  21     : mHotspotX(-1)
  22     , mHotspotY(-1)
  23     , mLoopCount(-1)
  24     , mIsNonPremultiplied(false)
  25   {}
  26
  27   // Set the metadata this object represents on an image.
  28   void SetOnImage(RasterImage* image);
  29
  30   void SetHotspot(uint16_t hotspotx, uint16_t hotspoty)
  31   {
  32     mHotspotX = hotspotx;
  33     mHotspotY = hotspoty;
  34   }
  35   void SetLoopCount(int32_t loopcount)
  36   {
  37     mLoopCount = loopcount;
  38   }
  39
  40   void SetIsNonPremultiplied(bool nonPremult)
  41   {
  42     mIsNonPremultiplied = nonPremult;
  43   }
  44
  45   void SetSize(int32_t width, int32_t height)
  46   {
  47     mSize.construct(nsIntSize(width, height));
  48   }
  49
  50   bool HasSize() const { return !mSize.empty(); }
  51
  52   int32_t GetWidth() const { return mSize.ref().width; }
  53   int32_t GetHeight() const { return mSize.ref().height; }
  54
  55 private:
  56   // The hotspot found on cursors, or -1 if none was found.
  57   int32_t mHotspotX;
  58   int32_t mHotspotY;
  59
  60   // The loop count for animated images, or -1 for infinite loop.
  61   int32_t mLoopCount;
  62
  63   Maybe<nsIntSize> mSize;
  64
  65   bool mIsNonPremultiplied;
  66 };
  67
  68 } // namespace image
  69 } // namespace mozilla