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Copied from: https://hg.mozilla.org/releases/mozilla-esr38/rev/8bfaa27698ca
Mozilla Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1146335
# HG changeset patch
# User Seth Fowler <mark.seth.fowler@gmail.com>
# Date 1428627143 25200
# Node ID 8bfaa27698ca0720d5c9f3910ab7148b38db0625
# Parent 9d14787bd10e6f3013263a2cae0bcc78bebde1db
Bug 1146335 (Part 2) - Fix an off-by-one error in image::Downscaler. r=tn a=lizzard
diff --git a/image/src/Downscaler.cpp b/image/src/Downscaler.cpp
--- a/image/src/Downscaler.cpp
+++ b/image/src/Downscaler.cpp
@@ -160,20 +160,26 @@ Downscaler::CommitRow()
int32_t inLineToRead = filterOffset + mLinesInBuffer;
MOZ_ASSERT(mCurrentInLine <= inLineToRead, "Reading past end of input");
if (mCurrentInLine == inLineToRead) {
skia::ConvolveHorizontally(mRowBuffer.get(), *mXFilter,
mWindow[mLinesInBuffer++], mHasAlpha,
/* use_sse2 = */ true);
}
- while (mLinesInBuffer == filterLength &&
- mCurrentOutLine < mTargetSize.height) {
+ MOZ_ASSERT(mCurrentOutLine < mTargetSize.height,
+ "Writing past end of output");
+
+ while (mLinesInBuffer == filterLength) {
DownscaleInputLine();
+ if (mCurrentOutLine == mTargetSize.height) {
+ break; // We're done.
+ }
+
GetFilterOffsetAndLength(mYFilter, mCurrentOutLine,
&filterOffset, &filterLength);
}
mCurrentInLine += 1;
}
bool
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