/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef mozilla_image_DecoderFactory_h #define mozilla_image_DecoderFactory_h #include "DecoderFlags.h" #include "mozilla/Attributes.h" #include "mozilla/Maybe.h" #include "mozilla/NotNull.h" #include "mozilla/gfx/2D.h" #include "nsCOMPtr.h" #include "SurfaceFlags.h" namespace mozilla { namespace image { class Decoder; class IDecodingTask; class nsICODecoder; class RasterImage; class SourceBuffer; class SourceBufferIterator; /** * The type of decoder; this is usually determined from a MIME type using * DecoderFactory::GetDecoderType(). */ enum class DecoderType { PNG, GIF, JPEG, BMP, ICO, ICON, UNKNOWN }; class DecoderFactory { public: /// @return the type of decoder which is appropriate for @aMimeType. static DecoderType GetDecoderType(const char* aMimeType); /** * Creates and initializes a decoder for non-animated images of type @aType. * (If the image *is* animated, only the first frame will be decoded.) The * decoder will send notifications to @aImage. * * @param aType Which type of decoder to create - JPEG, PNG, etc. * @param aImage The image will own the decoder and which should receive * notifications as decoding progresses. * @param aSourceBuffer The SourceBuffer which the decoder will read its data * from. * @param aIntrinsicSize The intrinsic size of the image, normally obtained * during the metadata decode. * @param aOutputSize The output size for the decoder. If this is smaller than * the intrinsic size, the decoder will downscale the * image. * @param aDecoderFlags Flags specifying the behavior of this decoder. * @param aSurfaceFlags Flags specifying the type of output this decoder * should produce. * @param aOutTask Task representing the decoder. * @return NS_OK if the decoder has been created/initialized successfully; * NS_ERROR_ALREADY_INITIALIZED if there is already an active decoder * for this image; * Else some other unrecoverable error occurred. */ static nsresult CreateDecoder(DecoderType aType, NotNull aImage, NotNull aSourceBuffer, const gfx::IntSize& aIntrinsicSize, const gfx::IntSize& aOutputSize, DecoderFlags aDecoderFlags, SurfaceFlags aSurfaceFlags, IDecodingTask** aOutTask); /** * Creates and initializes a decoder for animated images of type @aType. * The decoder will send notifications to @aImage. * * @param aType Which type of decoder to create - JPEG, PNG, etc. * @param aImage The image will own the decoder and which should receive * notifications as decoding progresses. * @param aSourceBuffer The SourceBuffer which the decoder will read its data * from. * @param aIntrinsicSize The intrinsic size of the image, normally obtained * during the metadata decode. * @param aDecoderFlags Flags specifying the behavior of this decoder. * @param aSurfaceFlags Flags specifying the type of output this decoder * should produce. * @param aOutTask Task representing the decoder. * @return NS_OK if the decoder has been created/initialized successfully; * NS_ERROR_ALREADY_INITIALIZED if there is already an active decoder * for this image; * Else some other unrecoverable error occurred. */ static nsresult CreateAnimationDecoder(DecoderType aType, NotNull aImage, NotNull aSourceBuffer, const gfx::IntSize& aIntrinsicSize, DecoderFlags aDecoderFlags, SurfaceFlags aSurfaceFlags, IDecodingTask** aOutTask); /** * Creates and initializes a metadata decoder of type @aType. This decoder * will only decode the image's header, extracting metadata like the size of * the image. No actual image data will be decoded and no surfaces will be * allocated. The decoder will send notifications to @aImage. * * @param aType Which type of decoder to create - JPEG, PNG, etc. * @param aImage The image will own the decoder and which should receive * notifications as decoding progresses. * @param aSourceBuffer The SourceBuffer which the decoder will read its data * from. */ static already_AddRefed CreateMetadataDecoder(DecoderType aType, NotNull aImage, NotNull aSourceBuffer); /** * Creates and initializes a decoder for an ICO resource, which may be either * a BMP or PNG image. * * @param aType Which type of decoder to create. This must be either BMP or * PNG. * @param aIterator The SourceBufferIterator which the decoder will read its * data from. * @param aICODecoder The ICO decoder which is controlling this resource * decoder. @aICODecoder's settings will be copied to the * resource decoder, so the two decoders will have the * same decoder flags, surface flags, target size, and * other parameters. * @param aIsMetadataDecode Indicates whether or not this decoder is for * metadata or not. Independent of the state of the * parent decoder. * @param aExpectedSize The expected size of the resource from the ICO header. * @param aDataOffset If @aType is BMP, specifies the offset at which data * begins in the BMP resource. Must be Some() if and only * if @aType is BMP. */ static already_AddRefed CreateDecoderForICOResource(DecoderType aType, SourceBufferIterator&& aIterator, NotNull aICODecoder, bool aIsMetadataDecode, const Maybe& aExpectedSize, const Maybe& aDataOffset = Nothing()); /** * Creates and initializes an anonymous decoder (one which isn't associated * with an Image object). Only the first frame of the image will be decoded. * * @param aType Which type of decoder to create - JPEG, PNG, etc. * @param aSourceBuffer The SourceBuffer which the decoder will read its data * from. * @param aOutputSize If Some(), the output size for the decoder. If this is * smaller than the intrinsic size, the decoder will * downscale the image. If Nothing(), the output size will * be the intrinsic size. * @param aSurfaceFlags Flags specifying the type of output this decoder * should produce. */ static already_AddRefed CreateAnonymousDecoder(DecoderType aType, NotNull aSourceBuffer, const Maybe& aOutputSize, SurfaceFlags aSurfaceFlags); /** * Creates and initializes an anonymous metadata decoder (one which isn't * associated with an Image object). This decoder will only decode the image's * header, extracting metadata like the size of the image. No actual image * data will be decoded and no surfaces will be allocated. * * @param aType Which type of decoder to create - JPEG, PNG, etc. * @param aSourceBuffer The SourceBuffer which the decoder will read its data * from. */ static already_AddRefed CreateAnonymousMetadataDecoder(DecoderType aType, NotNull aSourceBuffer); private: virtual ~DecoderFactory() = 0; /** * An internal method which allocates a new decoder of the requested @aType. */ static already_AddRefed GetDecoder(DecoderType aType, RasterImage* aImage, bool aIsRedecode); }; } // namespace image } // namespace mozilla #endif // mozilla_image_DecoderFactory_h