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Bug 1063084 - BMP with compression can be transparent. r=seth

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This commit is contained in:
Benoit Girard 2014-09-04 16:08:33 -04:00
parent 3f1edc2c3a
commit 26e2c0e96e
1 changed files with 6 additions and 0 deletions
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6
image/decoders/nsBMPDecoder.cpp
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@ -742,6 +742,9 @@ nsBMPDecoder::WriteInternal(const char* aBuffer, uint32_t aCount, DecodeStrategy
byte = *aBuffer++;
aCount--;
mCurPos += byte;
// Delta encoding makes it possible to skip pixels making
// the image transparent.
mUseAlphaData = mHaveAlphaData = true;
if (mCurPos > mBIH.width)
mCurPos = mBIH.width;
@ -753,6 +756,9 @@ nsBMPDecoder::WriteInternal(const char* aBuffer, uint32_t aCount, DecodeStrategy
byte = *aBuffer++;
aCount--;
mState = eRLEStateInitial;
// Delta encoding makes it possible to skip pixels making
// the image transparent.
mUseAlphaData = mHaveAlphaData = true;
mCurLine -= std::min<int32_t>(byte, mCurLine);
break;