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+/* -*- 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_decoders_nsJPEGDecoder_h
+#define mozilla_image_decoders_nsJPEGDecoder_h
+
+#include "RasterImage.h"
+// On Windows systems, RasterImage.h brings in 'windows.h', which defines INT32.
+// But the jpeg decoder has its own definition of INT32. To avoid build issues,
+// we need to undefine the version from 'windows.h'.
+#undef INT32
+
+#include "Decoder.h"
+
+#include "nsIInputStream.h"
+#include "nsIPipe.h"
+#include "qcms.h"
+
+extern "C" {
+#include "jpeglib.h"
+}
+
+#include <setjmp.h>
+
+namespace mozilla {
+namespace image {
+
+typedef struct {
+ struct jpeg_error_mgr pub; // "public" fields for IJG library
+ jmp_buf setjmp_buffer; // For handling catastropic errors
+} decoder_error_mgr;
+
+typedef enum {
+ JPEG_HEADER, // Reading JFIF headers
+ JPEG_START_DECOMPRESS,
+ JPEG_DECOMPRESS_PROGRESSIVE, // Output progressive pixels
+ JPEG_DECOMPRESS_SEQUENTIAL, // Output sequential pixels
+ JPEG_DONE,
+ JPEG_SINK_NON_JPEG_TRAILER, // Some image files have a
+ // non-JPEG trailer
+ JPEG_ERROR
+} jstate;
+
+class RasterImage;
+struct Orientation;
+
+class nsJPEGDecoder : public Decoder
+{
+public:
+ virtual ~nsJPEGDecoder();
+
+ virtual void SetSampleSize(int aSampleSize) override
+ {
+ mSampleSize = aSampleSize;
+ }
+
+ void NotifyDone();
+
+protected:
+ nsresult InitInternal() override;
+ LexerResult DoDecode(SourceBufferIterator& aIterator,
+ IResumable* aOnResume) override;
+ nsresult FinishInternal() override;
+
+ Maybe<Telemetry::ID> SpeedHistogram() const override;
+
+protected:
+ Orientation ReadOrientationFromEXIF();
+ void OutputScanlines(bool* suspend);
+
+private:
+ friend class DecoderFactory;
+
+ // Decoders should only be instantiated via DecoderFactory.
+ nsJPEGDecoder(RasterImage* aImage, Decoder::DecodeStyle aDecodeStyle);
+
+ enum class State
+ {
+ JPEG_DATA,
+ FINISHED_JPEG_DATA
+ };
+
+ LexerTransition<State> ReadJPEGData(const char* aData, size_t aLength);
+ LexerTransition<State> FinishedJPEGData();
+
+ StreamingLexer<State> mLexer;
+
+public:
+ struct jpeg_decompress_struct mInfo;
+ struct jpeg_source_mgr mSourceMgr;
+ decoder_error_mgr mErr;
+ jstate mState;
+
+ uint32_t mBytesToSkip;
+
+ const JOCTET* mSegment; // The current segment we are decoding from
+ uint32_t mSegmentLen; // amount of data in mSegment
+
+ JOCTET* mBackBuffer;
+ uint32_t mBackBufferLen; // Offset of end of active backtrack data
+ uint32_t mBackBufferSize; // size in bytes what mBackBuffer was created with
+ uint32_t mBackBufferUnreadLen; // amount of data currently in mBackBuffer
+
+ JOCTET * mProfile;
+ uint32_t mProfileLength;
+
+ qcms_profile* mInProfile;
+ qcms_transform* mTransform;
+
+ bool mReading;
+
+ const Decoder::DecodeStyle mDecodeStyle;
+
+ uint32_t mCMSMode;
+
+ int mSampleSize;
+};
+
+} // namespace image
+} // namespace mozilla
+
+#endif // mozilla_image_decoders_nsJPEGDecoder_h