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Non-photo source produce far less literal reference and their buffer is usually much smaller than the picture size if its compresses well. Hence, use a block-base allocation (and recycling) to avoid pre-allocating a buffer with maximal size. This can reduce memory consumption up to 50% for non-photographic content. Encode speed is also a little better (1-2%) Change-Id: Icbc229e1e5a08976348e600c8906beaa26954a11