1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/image/decoders/nsJPEGDecoder.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,101 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + *
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef nsJPEGDecoder_h__
1.11 +#define nsJPEGDecoder_h__
1.12 +
1.13 +#include "RasterImage.h"
1.14 +/* On Windows systems, RasterImage.h brings in 'windows.h', which defines INT32.
1.15 + * But the jpeg decoder has its own definition of INT32. To avoid build issues,
1.16 + * we need to undefine the version from 'windows.h'. */
1.17 +#undef INT32
1.18 +
1.19 +#include "Decoder.h"
1.20 +
1.21 +#include "nsAutoPtr.h"
1.22 +
1.23 +#include "nsIInputStream.h"
1.24 +#include "nsIPipe.h"
1.25 +#include "qcms.h"
1.26 +
1.27 +extern "C" {
1.28 +#include "jpeglib.h"
1.29 +}
1.30 +
1.31 +#include <setjmp.h>
1.32 +
1.33 +namespace mozilla {
1.34 +namespace image {
1.35 +
1.36 +typedef struct {
1.37 + struct jpeg_error_mgr pub; /* "public" fields for IJG library*/
1.38 + jmp_buf setjmp_buffer; /* For handling catastropic errors */
1.39 +} decoder_error_mgr;
1.40 +
1.41 +typedef enum {
1.42 + JPEG_HEADER, /* Reading JFIF headers */
1.43 + JPEG_START_DECOMPRESS,
1.44 + JPEG_DECOMPRESS_PROGRESSIVE, /* Output progressive pixels */
1.45 + JPEG_DECOMPRESS_SEQUENTIAL, /* Output sequential pixels */
1.46 + JPEG_DONE,
1.47 + JPEG_SINK_NON_JPEG_TRAILER, /* Some image files have a */
1.48 + /* non-JPEG trailer */
1.49 + JPEG_ERROR
1.50 +} jstate;
1.51 +
1.52 +class RasterImage;
1.53 +class Orientation;
1.54 +
1.55 +class nsJPEGDecoder : public Decoder
1.56 +{
1.57 +public:
1.58 + nsJPEGDecoder(RasterImage &aImage, Decoder::DecodeStyle aDecodeStyle);
1.59 + virtual ~nsJPEGDecoder();
1.60 +
1.61 + virtual void InitInternal();
1.62 + virtual void WriteInternal(const char* aBuffer, uint32_t aCount, DecodeStrategy aStrategy);
1.63 + virtual void FinishInternal();
1.64 +
1.65 + virtual Telemetry::ID SpeedHistogram();
1.66 + void NotifyDone();
1.67 +
1.68 +protected:
1.69 + Orientation ReadOrientationFromEXIF();
1.70 + void OutputScanlines(bool* suspend);
1.71 +
1.72 +public:
1.73 + struct jpeg_decompress_struct mInfo;
1.74 + struct jpeg_source_mgr mSourceMgr;
1.75 + decoder_error_mgr mErr;
1.76 + jstate mState;
1.77 +
1.78 + uint32_t mBytesToSkip;
1.79 +
1.80 + const JOCTET *mSegment; // The current segment we are decoding from
1.81 + uint32_t mSegmentLen; // amount of data in mSegment
1.82 +
1.83 + JOCTET *mBackBuffer;
1.84 + uint32_t mBackBufferLen; // Offset of end of active backtrack data
1.85 + uint32_t mBackBufferSize; // size in bytes what mBackBuffer was created with
1.86 + uint32_t mBackBufferUnreadLen; // amount of data currently in mBackBuffer
1.87 +
1.88 + JOCTET *mProfile;
1.89 + uint32_t mProfileLength;
1.90 +
1.91 + qcms_profile *mInProfile;
1.92 + qcms_transform *mTransform;
1.93 +
1.94 + bool mReading;
1.95 +
1.96 + const Decoder::DecodeStyle mDecodeStyle;
1.97 +
1.98 + uint32_t mCMSMode;
1.99 +};
1.100 +
1.101 +} // namespace image
1.102 +} // namespace mozilla
1.103 +
1.104 +#endif // nsJPEGDecoder_h__
