The Tor Browser / file comparison
comparison: image/decoders/nsIconDecoder.cpp
image/decoders/nsIconDecoder.cpp
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
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| -1:000000000000 | 0:42ffae9f8961 |
|---|---|
| 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/. */ | |
| 6 | |
| 7 #include "nsIconDecoder.h" | |
| 8 #include "nsIInputStream.h" | |
| 9 #include "RasterImage.h" | |
| 10 #include "nspr.h" | |
| 11 #include "nsRect.h" | |
| 12 | |
| 13 #include "nsError.h" | |
| 14 #include <algorithm> | |
| 15 | |
| 16 namespace mozilla { | |
| 17 namespace image { | |
| 18 | |
| 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 } | |
| 28 | |
| 29 nsIconDecoder::~nsIconDecoder() | |
| 30 { } | |
| 31 | |
| 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!"); | |
| 36 | |
| 37 // We put this here to avoid errors about crossing initialization with case | |
| 38 // jumps on linux. | |
| 39 uint32_t bytesToRead = 0; | |
| 40 | |
| 41 // Loop until the input data is gone | |
| 42 while (aCount > 0) { | |
| 43 switch (mState) { | |
| 44 case iconStateStart: | |
| 45 | |
| 46 // Grab the width | |
| 47 mWidth = (uint8_t)*aBuffer; | |
| 48 | |
| 49 // Book Keeping | |
| 50 aBuffer++; | |
| 51 aCount--; | |
| 52 mState = iconStateHaveHeight; | |
| 53 break; | |
| 54 | |
| 55 case iconStateHaveHeight: | |
| 56 | |
| 57 // Grab the Height | |
| 58 mHeight = (uint8_t)*aBuffer; | |
| 59 | |
| 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 } | |
| 67 | |
| 68 // If We're doing a size decode, we're done | |
| 69 if (IsSizeDecode()) { | |
| 70 mState = iconStateFinished; | |
| 71 break; | |
| 72 } | |
| 73 | |
| 74 if (!mImageData) { | |
| 75 PostDecoderError(NS_ERROR_OUT_OF_MEMORY); | |
| 76 return; | |
| 77 } | |
| 78 | |
| 79 // Book Keeping | |
| 80 aBuffer++; | |
| 81 aCount--; | |
| 82 mState = iconStateReadPixels; | |
| 83 break; | |
| 84 | |
| 85 case iconStateReadPixels: | |
| 86 { | |
| 87 | |
| 88 // How many bytes are we reading? | |
| 89 bytesToRead = std::min(aCount, mImageDataLength - mPixBytesRead); | |
| 90 | |
| 91 // Copy the bytes | |
| 92 memcpy(mImageData + mPixBytesRead, aBuffer, bytesToRead); | |
| 93 | |
| 94 // Performance isn't critical here, so our update rectangle is | |
| 95 // always the full icon | |
| 96 nsIntRect r(0, 0, mWidth, mHeight); | |
| 97 | |
| 98 // Invalidate | |
| 99 PostInvalidation(r); | |
| 100 | |
| 101 // Book Keeping | |
| 102 aBuffer += bytesToRead; | |
| 103 aCount -= bytesToRead; | |
| 104 mPixBytesRead += bytesToRead; | |
| 105 | |
| 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 } | |
| 114 | |
| 115 case iconStateFinished: | |
| 116 | |
| 117 // Consume all excess data silently | |
| 118 aCount = 0; | |
| 119 | |
| 120 break; | |
| 121 } | |
| 122 } | |
| 123 } | |
| 124 | |
| 125 } // namespace image | |
| 126 } // namespace mozilla |
