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Bug 1409440. r=tnikkel, a=RyanVM

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This commit is contained in:
Andrew Osmond 2018-03-28 14:47:32 -04:00 • committed by Roy Tam
commit 8b03cc774b
2 changed files with 20 additions and 8 deletions
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14
image/Downscaler.cpp
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@ -231,6 +231,7 @@ Downscaler::CommitRow()
int32_t inLineToRead = filterOffset + mLinesInBuffer;
MOZ_ASSERT(mCurrentInLine <= inLineToRead, "Reading past end of input");
if (mCurrentInLine == inLineToRead) {
MOZ_RELEASE_ASSERT(mLinesInBuffer < mWindowCapacity, "Need more rows than capacity!");
skia::ConvolveHorizontally(mRowBuffer.get(), *mXFilter,
mWindow[mLinesInBuffer++], mHasAlpha,
supports_sse2() || supports_mmi());
@ -239,7 +240,7 @@ Downscaler::CommitRow()
MOZ_ASSERT(mCurrentOutLine < mTargetSize.height,
"Writing past end of output");
while (mLinesInBuffer == filterLength) {
while (mLinesInBuffer >= filterLength) {
DownscaleInputLine();
if (mCurrentOutLine == mTargetSize.height) {
@ -340,9 +341,14 @@ Downscaler::DownscaleInputLine()
// Shift the buffer. We're just moving pointers here, so this is cheap.
mLinesInBuffer -= diff;
mLinesInBuffer = max(mLinesInBuffer, 0);
for (int32_t i = 0; i < mLinesInBuffer; ++i) {
swap(mWindow[i], mWindow[filterLength - mLinesInBuffer + i]);
mLinesInBuffer = min(max(mLinesInBuffer, 0), mWindowCapacity);
// If we already have enough rows to satisfy the filter, there is no need
// to swap as we won't be writing more before the next convolution.
if (filterLength > mLinesInBuffer) {
for (int32_t i = 0; i < mLinesInBuffer; ++i) {
swap(mWindow[i], mWindow[filterLength - mLinesInBuffer + i]);
}
}
}