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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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3
src/enc/config.c
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@ -42,6 +42,7 @@ int WebPConfigInitInternal(WebPConfig* const config,
config->preprocessing = 0;
config->autofilter = 0;
config->alpha_compression = 0;
config->partition_limit = 0;
// TODO(skal): tune.
switch (preset) {
@ -106,6 +107,8 @@ int WebPValidateConfig(const WebPConfig* const config) {
return 0;
if (config->partitions < 0 || config->partitions > 3)
return 0;
if (config->partition_limit < 0 || config->partition_limit > 100)
return 0;
if (config->alpha_compression < 0)
return 0;
return 1;