diff options
| -rw-r--r-- | image/SourceBuffer.h | 7 | ||||
| -rw-r--r-- | image/decoders/nsWebPDecoder.cpp | 4 |
2 files changed, 11 insertions, 0 deletions
diff --git a/image/SourceBuffer.h b/image/SourceBuffer.h index 64727e65e2..6f2c74d33b 100644 --- a/image/SourceBuffer.h +++ b/image/SourceBuffer.h @@ -174,6 +174,13 @@ public: return mState == READY ? mData.mIterating.mNextReadLength : 0; } + /// If we're ready to read, returns whether or not everything available thus + /// far has been in the same contiguous buffer. + bool IsContiguous() const { + MOZ_ASSERT(mState == READY, "Calling IsContiguous() in the wrong state"); + return mState == READY ? mData.mIterating.mChunk == 0 : false; + } + /// @return a count of the chunks we've advanced through. uint32_t ChunkCount() const { return mChunkCount; } diff --git a/image/decoders/nsWebPDecoder.cpp b/image/decoders/nsWebPDecoder.cpp index 4f3cc8b2ad..3181e3a3ad 100644 --- a/image/decoders/nsWebPDecoder.cpp +++ b/image/decoders/nsWebPDecoder.cpp @@ -144,6 +144,10 @@ nsWebPDecoder::UpdateBuffer(SourceBufferIterator& aIterator, switch (aState) { case SourceBufferIterator::READY: + if(!aIterator.IsContiguous()) { + //We need to buffer. This should be rare, but expensive. + break; + } if (!mData) { // For as long as we hold onto an iterator, we know the data pointers // to the chunks cannot change underneath us, so save the pointer to |