image/DecoderFactory.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 #ifndef mozilla_image_DecoderFactory_h
   8 #define mozilla_image_DecoderFactory_h
   9
  10 #include "DecoderFlags.h"
  11 #include "mozilla/Attributes.h"
  12 #include "mozilla/Maybe.h"
  13 #include "mozilla/NotNull.h"
  14 #include "mozilla/gfx/2D.h"
  15 #include "nsCOMPtr.h"
  16 #include "SurfaceFlags.h"
  17
  18 namespace mozilla {
  19 namespace image {
  20
  21 class Decoder;
  22 class IDecodingTask;
  23 class nsICODecoder;
  24 class RasterImage;
  25 class SourceBuffer;
  26 class SourceBufferIterator;
  27
  28 /**
  29  * The type of decoder; this is usually determined from a MIME type using
  30  * DecoderFactory::GetDecoderType().
  31  */
  32 enum class DecoderType {
  33   PNG,
  34   GIF,
  35   JPEG,
  36   BMP,
  37   BMP_CLIPBOARD,
  38   ICO,
  39   ICON,
  40   WEBP,
  41   AVIF,
  42   UNKNOWN
  43 };
  44
  45 class DecoderFactory {
  46  public:
  47   /// @return the type of decoder which is appropriate for @aMimeType.
  48   static DecoderType GetDecoderType(const char* aMimeType);
  49
  50   /**
  51    * Creates and initializes a decoder for non-animated images of type @aType.
  52    * (If the image *is* animated, only the first frame will be decoded.) The
  53    * decoder will send notifications to @aImage.
  54    *
  55    * @param aType Which type of decoder to create - JPEG, PNG, etc.
  56    * @param aImage The image will own the decoder and which should receive
  57    *               notifications as decoding progresses.
  58    * @param aSourceBuffer The SourceBuffer which the decoder will read its data
  59    *                      from.
  60    * @param aIntrinsicSize The intrinsic size of the image, normally obtained
  61    *                       during the metadata decode.
  62    * @param aOutputSize The output size for the decoder. If this is smaller than
  63    *                    the intrinsic size, the decoder will downscale the
  64    *                    image.
  65    * @param aDecoderFlags Flags specifying the behavior of this decoder.
  66    * @param aSurfaceFlags Flags specifying the type of output this decoder
  67    *                      should produce.
  68    * @param aOutTask Task representing the decoder.
  69    * @return NS_OK if the decoder has been created/initialized successfully;
  70    *         NS_ERROR_ALREADY_INITIALIZED if there is already an active decoder
  71    *           for this image;
  72    *         Else some other unrecoverable error occurred.
  73    */
  74   static nsresult CreateDecoder(DecoderType aType, NotNull<RasterImage*> aImage,
  75                                 NotNull<SourceBuffer*> aSourceBuffer,
  76                                 const gfx::IntSize& aIntrinsicSize,
  77                                 const gfx::IntSize& aOutputSize,
  78                                 DecoderFlags aDecoderFlags,
  79                                 SurfaceFlags aSurfaceFlags,
  80                                 IDecodingTask** aOutTask);
  81
  82   /**
  83    * Creates and initializes a decoder for animated images of type @aType.
  84    * The decoder will send notifications to @aImage.
  85    *
  86    * @param aType Which type of decoder to create - JPEG, PNG, etc.
  87    * @param aImage The image will own the decoder and which should receive
  88    *               notifications as decoding progresses.
  89    * @param aSourceBuffer The SourceBuffer which the decoder will read its data
  90    *                      from.
  91    * @param aIntrinsicSize The intrinsic size of the image, normally obtained
  92    *                       during the metadata decode.
  93    * @param aDecoderFlags Flags specifying the behavior of this decoder.
  94    * @param aSurfaceFlags Flags specifying the type of output this decoder
  95    *                      should produce.
  96    * @param aCurrentFrame The current frame the decoder should auto advance to.
  97    * @param aOutTask Task representing the decoder.
  98    * @return NS_OK if the decoder has been created/initialized successfully;
  99    *         NS_ERROR_ALREADY_INITIALIZED if there is already an active decoder
 100    *           for this image;
 101    *         Else some other unrecoverable error occurred.
 102    */
 103   static nsresult CreateAnimationDecoder(
 104       DecoderType aType, NotNull<RasterImage*> aImage,
 105       NotNull<SourceBuffer*> aSourceBuffer, const gfx::IntSize& aIntrinsicSize,
 106       DecoderFlags aDecoderFlags, SurfaceFlags aSurfaceFlags,
 107       size_t aCurrentFrame, IDecodingTask** aOutTask);
 108
 109   /**
 110    * Creates and initializes a decoder for animated images, cloned from the
 111    * given decoder.
 112    *
 113    * @param aDecoder Decoder to clone.
 114    */
 115   static already_AddRefed<Decoder> CloneAnimationDecoder(Decoder* aDecoder);
 116
 117   /**
 118    * Creates and initializes a metadata decoder of type @aType. This decoder
 119    * will only decode the image's header, extracting metadata like the size of
 120    * the image. No actual image data will be decoded and no surfaces will be
 121    * allocated. The decoder will send notifications to @aImage.
 122    *
 123    * @param aType Which type of decoder to create - JPEG, PNG, etc.
 124    * @param aImage The image will own the decoder and which should receive
 125    *               notifications as decoding progresses.
 126    * @param aSourceBuffer The SourceBuffer which the decoder will read its data
 127    *                      from.
 128    */
 129   static already_AddRefed<IDecodingTask> CreateMetadataDecoder(
 130       DecoderType aType, NotNull<RasterImage*> aImage,
 131       NotNull<SourceBuffer*> aSourceBuffer);
 132
 133   /**
 134    * Creates and initializes a decoder for an ICO resource, which may be either
 135    * a BMP or PNG image.
 136    *
 137    * @param aType Which type of decoder to create. This must be either BMP or
 138    *              PNG.
 139    * @param aIterator The SourceBufferIterator which the decoder will read its
 140    *                  data from.
 141    * @param aICODecoder The ICO decoder which is controlling this resource
 142    *                    decoder. @aICODecoder's settings will be copied to the
 143    *                    resource decoder, so the two decoders will have the
 144    *                    same decoder flags, surface flags, target size, and
 145    *                    other parameters.
 146    * @param aIsMetadataDecode Indicates whether or not this decoder is for
 147    *                          metadata or not. Independent of the state of the
 148    *                          parent decoder.
 149    * @param aExpectedSize The expected size of the resource from the ICO header.
 150    * @param aDataOffset If @aType is BMP, specifies the offset at which data
 151    *                    begins in the BMP resource. Must be Some() if and only
 152    *                    if @aType is BMP.
 153    */
 154   static already_AddRefed<Decoder> CreateDecoderForICOResource(
 155       DecoderType aType, SourceBufferIterator&& aIterator,
 156       NotNull<nsICODecoder*> aICODecoder, bool aIsMetadataDecode,
 157       const Maybe<gfx::IntSize>& aExpectedSize,
 158       const Maybe<uint32_t>& aDataOffset = Nothing());
 159
 160   /**
 161    * Creates and initializes an anonymous decoder (one which isn't associated
 162    * with an Image object). Only the first frame of the image will be decoded.
 163    *
 164    * @param aType Which type of decoder to create - JPEG, PNG, etc.
 165    * @param aSourceBuffer The SourceBuffer which the decoder will read its data
 166    *                      from.
 167    * @param aOutputSize If Some(), the output size for the decoder. If this is
 168    *                    smaller than the intrinsic size, the decoder will
 169    *                    downscale the image. If Nothing(), the output size will
 170    *                    be the intrinsic size.
 171    * @param aDecoderFlags Flags specifying the behavior of this decoder.
 172    * @param aSurfaceFlags Flags specifying the type of output this decoder
 173    *                      should produce.
 174    */
 175   static already_AddRefed<Decoder> CreateAnonymousDecoder(
 176       DecoderType aType, NotNull<SourceBuffer*> aSourceBuffer,
 177       const Maybe<gfx::IntSize>& aOutputSize, DecoderFlags aDecoderFlags,
 178       SurfaceFlags aSurfaceFlags);
 179
 180   /**
 181    * Creates and initializes an anonymous metadata decoder (one which isn't
 182    * associated with an Image object). This decoder will only decode the image's
 183    * header, extracting metadata like the size of the image. No actual image
 184    * data will be decoded and no surfaces will be allocated.
 185    *
 186    * @param aType Which type of decoder to create - JPEG, PNG, etc.
 187    * @param aSourceBuffer The SourceBuffer which the decoder will read its data
 188    *                      from.
 189    */
 190   static already_AddRefed<Decoder> CreateAnonymousMetadataDecoder(
 191       DecoderType aType, NotNull<SourceBuffer*> aSourceBuffer);
 192
 193  private:
 194   virtual ~DecoderFactory() = 0;
 195
 196   /**
 197    * An internal method which allocates a new decoder of the requested @aType.
 198    */
 199   static already_AddRefed<Decoder> GetDecoder(DecoderType aType,
 200                                               RasterImage* aImage,
 201                                               bool aIsRedecode);
 202 };
 203
 204 }  // namespace image
 205 }  // namespace mozilla
 206
 207 #endif  // mozilla_image_DecoderFactory_h