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Enc: add a qmin / qmax range for quality factor

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This is particularly useful for multi-pass search (but not only),
to prevent the search from going over or below a reasonable threshold.
E.g.: 'cwebp -qrange 50 80 ...' will prevent any unreasonable degradation.

new cwebp option: -qrange min max

Change-Id: I59f394533535fc20b6996bc0895f4301476d5eff
This commit is contained in:
Skal
2020-01-29 09:34:26 +01:00
parent 0fa56f307f
commit 6a0ff35872
6 changed files with 64 additions and 36 deletions
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5
src/enc/config_enc.c
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@ -39,6 +39,8 @@ int WebPConfigInitInternal(WebPConfig* config,
config->partitions = 0;
config->segments = 4;
config->pass = 1;
config->qmin = 0;
config->qmax = 100;
config->show_compressed = 0;
config->preprocessing = 0;
config->autofilter = 0;
@ -106,6 +108,9 @@ int WebPValidateConfig(const WebPConfig* config) {
if (config->filter_type < 0 || config->filter_type > 1) return 0;
if (config->autofilter < 0 || config->autofilter > 1) return 0;
if (config->pass < 1 || config->pass > 10) return 0;
if (config->qmin < 0 || config->qmax > 100 || config->qmin > config->qmax) {
return 0;
}
if (config->show_compressed < 0 || config->show_compressed > 1) return 0;
if (config->preprocessing < 0 || config->preprocessing > 7) return 0;
if (config->partitions < 0 || config->partitions > 3) return 0;