forked from mirrors/gecko-dev
da72652618
Currently we can only use the gfx.color_management.force_srgb pref to force all images to sRGB, or just accept device space. It would be nice to be able to test device space in our tests, as well as sRGB. This patch adds a surface flag which allows us to selectively output sRGB. This will also be useful for clipboard and re-encoding purposes, since they want a neutral output. In an ideal world we would just output the color profile and the pixel data in the original color space, but for now this is a relatively simple approach that works on all platforms and interops well with all applications. Differential Revision: https://phabricator.services.mozilla.com/D65734 --HG-- extra : moz-landing-system : lando
113 lines
3 KiB
C++
113 lines
3 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_decoders_nsJPEGDecoder_h
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#define mozilla_image_decoders_nsJPEGDecoder_h
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#include "RasterImage.h"
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#include "SurfacePipe.h"
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// On Windows systems, RasterImage.h brings in 'windows.h', which defines INT32.
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// But the jpeg decoder has its own definition of INT32. To avoid build issues,
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// we need to undefine the version from 'windows.h'.
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#undef INT32
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#include "Decoder.h"
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extern "C" {
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#include "jpeglib.h"
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}
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#include <setjmp.h>
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namespace mozilla {
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namespace image {
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typedef struct {
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struct jpeg_error_mgr pub; // "public" fields for IJG library
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jmp_buf setjmp_buffer; // For handling catastropic errors
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} decoder_error_mgr;
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typedef enum {
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JPEG_HEADER, // Reading JFIF headers
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JPEG_START_DECOMPRESS,
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JPEG_DECOMPRESS_PROGRESSIVE, // Output progressive pixels
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JPEG_DECOMPRESS_SEQUENTIAL, // Output sequential pixels
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JPEG_DONE,
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JPEG_SINK_NON_JPEG_TRAILER, // Some image files have a
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// non-JPEG trailer
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JPEG_ERROR
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} jstate;
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class RasterImage;
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struct Orientation;
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class nsJPEGDecoder : public Decoder {
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public:
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virtual ~nsJPEGDecoder();
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DecoderType GetType() const override { return DecoderType::JPEG; }
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void NotifyDone();
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protected:
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nsresult InitInternal() override;
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LexerResult DoDecode(SourceBufferIterator& aIterator,
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IResumable* aOnResume) override;
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nsresult FinishInternal() override;
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Maybe<Telemetry::HistogramID> SpeedHistogram() const override;
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protected:
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Orientation ReadOrientationFromEXIF();
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WriteState OutputScanlines();
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private:
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friend class DecoderFactory;
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// Decoders should only be instantiated via DecoderFactory.
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nsJPEGDecoder(RasterImage* aImage, Decoder::DecodeStyle aDecodeStyle);
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enum class State { JPEG_DATA, FINISHED_JPEG_DATA };
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void FinishRow(uint32_t aLastSourceRow);
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LexerTransition<State> ReadJPEGData(const char* aData, size_t aLength);
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LexerTransition<State> FinishedJPEGData();
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StreamingLexer<State> mLexer;
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public:
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struct jpeg_decompress_struct mInfo;
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struct jpeg_source_mgr mSourceMgr;
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decoder_error_mgr mErr;
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jstate mState;
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uint32_t mBytesToSkip;
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const JOCTET* mSegment; // The current segment we are decoding from
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uint32_t mSegmentLen; // amount of data in mSegment
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JOCTET* mBackBuffer;
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uint32_t mBackBufferLen; // Offset of end of active backtrack data
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uint32_t mBackBufferSize; // size in bytes what mBackBuffer was created with
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uint32_t mBackBufferUnreadLen; // amount of data currently in mBackBuffer
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JOCTET* mProfile;
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uint32_t mProfileLength;
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uint32_t* mCMSLine;
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bool mReading;
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const Decoder::DecodeStyle mDecodeStyle;
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SurfacePipe mPipe;
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_decoders_nsJPEGDecoder_h
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