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Bug 409878 - "Garbage displayed for part of bluebar.gif animation" [p=alfredkayser@nl.ibm.com (Alfred Kayser) r+a1.9=stuart]

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This commit is contained in:
reed@reedloden.com 2008-01-08 01:51:13 -08:00
parent 6e6e5c1aa0
commit 56c4d2753e
1 changed files with 21 additions and 10 deletions
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31
modules/libpr0n/decoders/gif/nsGIFDecoder2.cpp
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@ -353,7 +353,8 @@ void nsGIFDecoder2::BeginImageFrame(gfx_depth aDepth)
}
mImageFrame->SetFrameDisposalMethod(mGIFStruct.disposal_method);
mImageContainer->AppendFrame(mImageFrame);
if (!mGIFStruct.images_decoded)
mImageContainer->AppendFrame(mImageFrame);
if (mObserver)
mObserver->OnStartFrame(nsnull, mImageFrame);
@ -390,17 +391,27 @@ void nsGIFDecoder2::EndImageFrame()
mCurrentRow = mLastFlushedRow = -1;
mCurrentPass = mLastFlushedPass = 0;
mGIFStruct.images_decoded++;
// Only add frame if we have any rows at all
if (mGIFStruct.rows_remaining != mGIFStruct.height) {
if (mGIFStruct.rows_remaining && mGIFStruct.images_decoded) {
// Clear the remaining rows (only needed for the animation frames)
PRUint8 *rowp = mImageData + ((mGIFStruct.rows_remaining - mGIFStruct.height) * mGIFStruct.width);
memset(rowp, 0, mGIFStruct.rows_remaining * mGIFStruct.width);
}
// We actually have the timeout information before we get the lzw encoded
// image data, at least according to the spec, but we delay in setting the
// timeout for the image until here to help ensure that we have the whole
// image frame decoded before we go off and try to display another frame.
mImageFrame->SetTimeout(mGIFStruct.delay_time);
mImageContainer->EndFrameDecode(mGIFStruct.images_decoded, mGIFStruct.delay_time);
// We actually have the timeout information before we get the lzw encoded
// image data, at least according to the spec, but we delay in setting the
// timeout for the image until here to help ensure that we have the whole
// image frame decoded before we go off and try to display another frame.
mImageFrame->SetTimeout(mGIFStruct.delay_time);
if (mGIFStruct.images_decoded)
mImageContainer->AppendFrame(mImageFrame);
mImageContainer->EndFrameDecode(mGIFStruct.images_decoded, mGIFStruct.delay_time);
mGIFStruct.images_decoded++;
if (mObserver)
mObserver->OnStopFrame(nsnull, mImageFrame);
if (mObserver)
mObserver->OnStopFrame(nsnull, mImageFrame);
}
// Release reference to this frame
mImageFrame = nsnull;