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113 lines
3.0 KiB
C++
113 lines
3.0 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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#include "EXIF.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::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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EXIFData ReadExifData() const;
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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 mozilla::image
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#endif // mozilla_image_decoders_nsJPEGDecoder_h
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