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add a -partition_limit option to limit the number of bits used by intra4x4

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Although it degrades quality, this option is useful to avoid the 512k
limit for partition #0.
If not enough to reach the lower bound of 4bits per macroblock header,
one should also limit the number of segments used (down to -segments 1)

See the man file for extra details.

Change-Id: Ia59ffac13176c85b809ddd6340d37b54ee9487ea
This commit is contained in:
Pascal Massimino
2011-08-23 15:58:22 -07:00
parent cd12b4b0ac
commit 900286e091
8 changed files with 56 additions and 8 deletions
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2
src/webp/encode.h
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@ -69,6 +69,8 @@ typedef struct {
int preprocessing; // preprocessing filter (0=none, 1=segment-smooth)
int partitions; // log2(number of token partitions) in [0..3]
// Default is set to 0 for easier progressive decoding.
int partition_limit; // quality degradation allowed to fit the 512k limit on
// prediction modes coding (0=no degradation, 100=full)
int alpha_compression; // Algorithm for optimizing the alpha plane (0 = none)
} WebPConfig;