The Tor Browser: image/decoders/nsIconDecoder.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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 #include "nsIconDecoder.h"

     8 #include "nsIInputStream.h"

     9 #include "RasterImage.h"

    10 #include "nspr.h"

    11 #include "nsRect.h"

    13 #include "nsError.h"

    14 #include <algorithm>

    16 namespace mozilla {

    17 namespace image {

    19 nsIconDecoder::nsIconDecoder(RasterImage &aImage)

    20  : Decoder(aImage),

    21    mWidth(-1),

    22    mHeight(-1),

    23    mPixBytesRead(0),

    24    mState(iconStateStart)

    25 {

    26   // Nothing to do

    27 }

    29 nsIconDecoder::~nsIconDecoder()

    30 { }

    32 void

    33 nsIconDecoder::WriteInternal(const char *aBuffer, uint32_t aCount, DecodeStrategy)

    34 {

    35   NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call WriteInternal after error!");

    37   // We put this here to avoid errors about crossing initialization with case

    38   // jumps on linux.

    39   uint32_t bytesToRead = 0;

    41   // Loop until the input data is gone

    42   while (aCount > 0) {

    43     switch (mState) {

    44       case iconStateStart:

    46         // Grab the width

    47         mWidth = (uint8_t)*aBuffer;

    49         // Book Keeping

    50         aBuffer++;

    51         aCount--;

    52         mState = iconStateHaveHeight;

    53         break;

    55       case iconStateHaveHeight:

    57         // Grab the Height

    58         mHeight = (uint8_t)*aBuffer;

    60         // Post our size to the superclass

    61         PostSize(mWidth, mHeight);

    62         if (HasError()) {

    63           // Setting the size led to an error.

    64           mState = iconStateFinished;

    65           return;

    66         }

    68         // If We're doing a size decode, we're done

    69         if (IsSizeDecode()) {

    70           mState = iconStateFinished;

    71           break;

    72         }

    74         if (!mImageData) {

    75           PostDecoderError(NS_ERROR_OUT_OF_MEMORY);

    76           return;

    77         }

    79         // Book Keeping

    80         aBuffer++;

    81         aCount--;

    82         mState = iconStateReadPixels;

    83         break;

    85       case iconStateReadPixels:

    86       {

    88         // How many bytes are we reading?

    89         bytesToRead = std::min(aCount, mImageDataLength - mPixBytesRead);

    91         // Copy the bytes

    92         memcpy(mImageData + mPixBytesRead, aBuffer, bytesToRead);

    94         // Performance isn't critical here, so our update rectangle is

    95         // always the full icon

    96         nsIntRect r(0, 0, mWidth, mHeight);

    98         // Invalidate

    99         PostInvalidation(r);

   101         // Book Keeping

   102         aBuffer += bytesToRead;

   103         aCount -= bytesToRead;

   104         mPixBytesRead += bytesToRead;

   106         // If we've got all the pixel bytes, we're finished

   107         if (mPixBytesRead == mImageDataLength) {

   108           PostFrameStop();

   109           PostDecodeDone();

   110           mState = iconStateFinished;

   111         }

   112         break;

   113       }

   115       case iconStateFinished:

   117         // Consume all excess data silently

   118         aCount = 0;

   120         break;

   121     }

   122   }

   123 }

   125 } // namespace image

   126 } // namespace mozilla

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