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Add Alpha Encode support from WebPEncode.

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Extend WebP Encode functionality to encode Alpha data and produce
bit-stream (RIFF+VP8X+ALPH+VP8) corresponding to WebP-Alpha.

Change-Id: I983b4cd97be94a86a8e6d03b3b9c728db851bf48
This commit is contained in:
Vikas Arora
2011-12-01 12:14:15 +05:30
parent 16612ddd30
commit 9523f2a5de
9 changed files with 207 additions and 138 deletions
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5
src/enc/config.c
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@@ -41,8 +41,9 @@ int WebPConfigInitInternal(WebPConfig* const config,
config->show_compressed = 0;
config->preprocessing = 0;
config->autofilter = 0;
config->alpha_compression = 0;
config->partition_limit = 0;
config->alpha_compression = 1;
config->alpha_quality = 100;
// TODO(skal): tune.
switch (preset) {
@@ -111,6 +112,8 @@ int WebPValidateConfig(const WebPConfig* const config) {
return 0;
if (config->alpha_compression < 0)
return 0;
if (config->alpha_quality < 0 || config->alpha_quality > 100)
return 0;
return 1;
}