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Add incremental support for extended format files

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This applies to images with optional chunks (e.g. images with ALPH
chunk,
ICCP chunk etc). Before this, the incremental decoding used to work like
non-incremental decoding for such files, that is, no rows were decoded
until
all data was available.

The change is in 2 parts:
- During optional chunk parsing, don't wait for the full VP8/VP8L chunk.
- Remap 'alpha_data' pointer whenever a new buffer is allocated/used in
WebPIAppend() and WebPIUpdate().

Change-Id: I6cfd6ca1f334b9c6610fcbf662cd85fa494f2a91
(cherry picked from commit ead4d47859)
This commit is contained in:
Urvang Joshi
2013-04-05 14:01:07 -07:00
committed by James Zern
parent 5051245f3a
commit c22877f70f
5 changed files with 45 additions and 9 deletions
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3
NEWS
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@ -1,3 +1,6 @@
- Next version:
* Add incremental decoding support for images containing ALPH and ICCP chunks.
- 3/20/13: version 0.3.0
This is a binary compatible release.
* WebPINewRGB/WebPINewYUVA accept being passed a NULL output buffer