The Tor Browser: image/decoders/nsGIFDecoder2.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  *

     3  * This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #ifndef _nsGIFDecoder2_h

     8 #define _nsGIFDecoder2_h

    10 #include "nsCOMPtr.h"

    11 #include "Decoder.h"

    13 #include "GIF2.h"

    15 namespace mozilla {

    16 namespace image {

    17 class RasterImage;

    19 //////////////////////////////////////////////////////////////////////

    20 // nsGIFDecoder2 Definition

    22 class nsGIFDecoder2 : public Decoder

    23 {

    24 public:

    26   nsGIFDecoder2(RasterImage &aImage);

    27   ~nsGIFDecoder2();

    29   virtual void WriteInternal(const char* aBuffer, uint32_t aCount, DecodeStrategy aStrategy);

    30   virtual void FinishInternal();

    31   virtual Telemetry::ID SpeedHistogram();

    33 private:

    34   /* These functions will be called when the decoder has a decoded row,

    35    * frame size information, etc. */

    37   void      BeginGIF();

    38   void      BeginImageFrame(uint16_t aDepth);

    39   void      EndImageFrame();

    40   void      FlushImageData();

    41   void      FlushImageData(uint32_t fromRow, uint32_t rows);

    43   nsresult  GifWrite(const uint8_t * buf, uint32_t numbytes);

    44   uint32_t  OutputRow();

    45   bool      DoLzw(const uint8_t *q);

    46   bool      SetHold(const uint8_t* buf, uint32_t count,

    47                     const uint8_t* buf2 = nullptr, uint32_t count2 = 0);

    49   inline int ClearCode() const { return 1 << mGIFStruct.datasize; }

    51   int32_t mCurrentRow;

    52   int32_t mLastFlushedRow;

    54   uint32_t mOldColor;        // The old value of the transparent pixel

    56   // The frame number of the currently-decoding frame when we're in the middle

    57   // of decoding it, and -1 otherwise.

    58   int32_t mCurrentFrame;

    60   uint8_t mCurrentPass;

    61   uint8_t mLastFlushedPass;

    62   uint8_t mColorMask;        // Apply this to the pixel to keep within colormap

    63   bool mGIFOpen;

    64   bool mSawTransparency;

    66   gif_struct mGIFStruct;

    67 };

    69 } // namespace image

    70 } // namespace mozilla

    72 #endif

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