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107 lines
3.7 KiB
C++
107 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_image_DecoderFactory_h
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#define mozilla_image_DecoderFactory_h
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#include "mozilla/Maybe.h"
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#include "mozilla/gfx/2D.h"
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#include "nsCOMPtr.h"
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class nsACString;
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namespace mozilla {
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namespace image {
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class Decoder;
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class RasterImage;
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class SourceBuffer;
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enum class DecoderType
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{
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PNG,
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GIF,
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JPEG,
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BMP,
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ICO,
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ICON,
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UNKNOWN
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};
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class DecoderFactory
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{
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public:
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/// @return the type of decoder which is appropriate for @aMimeType.
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static DecoderType GetDecoderType(const char* aMimeType);
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/**
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* Creates and initializes a decoder of type @aType. The decoder will send
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* notifications to @aImage.
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*
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* XXX(seth): @aIsRedecode, @aImageIsTransient, and @aImageIsLocked should
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* really be part of @aFlags. This requires changes to the way that decoder
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* flags work, though. See bug 1185800.
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*
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* @param aType Which type of decoder to create - JPEG, PNG, etc.
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* @param aImage The image will own the decoder and which should receive
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* notifications as decoding progresses.
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* @param aSourceBuffer The SourceBuffer which the decoder will read its data
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* from.
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* @param aTargetSize If not Nothing(), the target size which the image should
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* be scaled to during decoding. It's an error to specify
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* a target size for a decoder type which doesn't support
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* downscale-during-decode.
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* @param aFlags Flags specifying what type of output the decoder should
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* produce; see GetDecodeFlags() in RasterImage.h.
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* @param aIsRedecode Specify 'true' if this image has been decoded before.
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* @param aImageIsTransient Specify 'true' if this image is transient.
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* @param aImageIsLocked Specify 'true' if this image is locked for the
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* lifetime of this decoder, and should be unlocked
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* when the decoder finishes.
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*/
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static already_AddRefed<Decoder>
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CreateDecoder(DecoderType aType,
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RasterImage* aImage,
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SourceBuffer* aSourceBuffer,
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const Maybe<gfx::IntSize>& aTargetSize,
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uint32_t aFlags,
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bool aIsRedecode,
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bool aImageIsTransient,
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bool aImageIsLocked);
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/**
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* Creates and initializes a metadata decoder of type @aType. This decoder
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* will only decode the image's header, extracting metadata like the size of
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* the image. No actual image data will be decoded and no surfaces will be
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* allocated. The decoder will send notifications to @aImage.
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*
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* @param aType Which type of decoder to create - JPEG, PNG, etc.
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* @param aImage The image will own the decoder and which should receive
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* notifications as decoding progresses.
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* @param aSourceBuffer The SourceBuffer which the decoder will read its data
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* from.
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*/
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static already_AddRefed<Decoder>
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CreateMetadataDecoder(DecoderType aType,
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RasterImage* aImage,
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SourceBuffer* aSourceBuffer);
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private:
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virtual ~DecoderFactory() = 0;
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/**
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* An internal method which allocates a new decoder of the requested @aType.
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*/
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static already_AddRefed<Decoder> GetDecoder(DecoderType aType,
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RasterImage* aImage,
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bool aIsRedecode);
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_DecoderFactory_h
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