1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/image/decoders/nsIconDecoder.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,126 @@
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 +#include "nsIconDecoder.h"
1.11 +#include "nsIInputStream.h"
1.12 +#include "RasterImage.h"
1.13 +#include "nspr.h"
1.14 +#include "nsRect.h"
1.15 +
1.16 +#include "nsError.h"
1.17 +#include <algorithm>
1.18 +
1.19 +namespace mozilla {
1.20 +namespace image {
1.21 +
1.22 +nsIconDecoder::nsIconDecoder(RasterImage &aImage)
1.23 + : Decoder(aImage),
1.24 + mWidth(-1),
1.25 + mHeight(-1),
1.26 + mPixBytesRead(0),
1.27 + mState(iconStateStart)
1.28 +{
1.29 + // Nothing to do
1.30 +}
1.31 +
1.32 +nsIconDecoder::~nsIconDecoder()
1.33 +{ }
1.34 +
1.35 +void
1.36 +nsIconDecoder::WriteInternal(const char *aBuffer, uint32_t aCount, DecodeStrategy)
1.37 +{
1.38 + NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call WriteInternal after error!");
1.39 +
1.40 + // We put this here to avoid errors about crossing initialization with case
1.41 + // jumps on linux.
1.42 + uint32_t bytesToRead = 0;
1.43 +
1.44 + // Loop until the input data is gone
1.45 + while (aCount > 0) {
1.46 + switch (mState) {
1.47 + case iconStateStart:
1.48 +
1.49 + // Grab the width
1.50 + mWidth = (uint8_t)*aBuffer;
1.51 +
1.52 + // Book Keeping
1.53 + aBuffer++;
1.54 + aCount--;
1.55 + mState = iconStateHaveHeight;
1.56 + break;
1.57 +
1.58 + case iconStateHaveHeight:
1.59 +
1.60 + // Grab the Height
1.61 + mHeight = (uint8_t)*aBuffer;
1.62 +
1.63 + // Post our size to the superclass
1.64 + PostSize(mWidth, mHeight);
1.65 + if (HasError()) {
1.66 + // Setting the size led to an error.
1.67 + mState = iconStateFinished;
1.68 + return;
1.69 + }
1.70 +
1.71 + // If We're doing a size decode, we're done
1.72 + if (IsSizeDecode()) {
1.73 + mState = iconStateFinished;
1.74 + break;
1.75 + }
1.76 +
1.77 + if (!mImageData) {
1.78 + PostDecoderError(NS_ERROR_OUT_OF_MEMORY);
1.79 + return;
1.80 + }
1.81 +
1.82 + // Book Keeping
1.83 + aBuffer++;
1.84 + aCount--;
1.85 + mState = iconStateReadPixels;
1.86 + break;
1.87 +
1.88 + case iconStateReadPixels:
1.89 + {
1.90 +
1.91 + // How many bytes are we reading?
1.92 + bytesToRead = std::min(aCount, mImageDataLength - mPixBytesRead);
1.93 +
1.94 + // Copy the bytes
1.95 + memcpy(mImageData + mPixBytesRead, aBuffer, bytesToRead);
1.96 +
1.97 + // Performance isn't critical here, so our update rectangle is
1.98 + // always the full icon
1.99 + nsIntRect r(0, 0, mWidth, mHeight);
1.100 +
1.101 + // Invalidate
1.102 + PostInvalidation(r);
1.103 +
1.104 + // Book Keeping
1.105 + aBuffer += bytesToRead;
1.106 + aCount -= bytesToRead;
1.107 + mPixBytesRead += bytesToRead;
1.108 +
1.109 + // If we've got all the pixel bytes, we're finished
1.110 + if (mPixBytesRead == mImageDataLength) {
1.111 + PostFrameStop();
1.112 + PostDecodeDone();
1.113 + mState = iconStateFinished;
1.114 + }
1.115 + break;
1.116 + }
1.117 +
1.118 + case iconStateFinished:
1.119 +
1.120 + // Consume all excess data silently
1.121 + aCount = 0;
1.122 +
1.123 + break;
1.124 + }
1.125 + }
1.126 +}
1.127 +
1.128 +} // namespace image
1.129 +} // namespace mozilla
