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Introduce a 'fast' alpha mode

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.. where only 2 filtering modes are potentially
tried, instead of all of them. This is fast than the exhaustive 'best'
mode, and not much worse.

Options for cwebp are:
 -alpha_filter none
 -alpha_filter fast      (<- default)
 -alpha_filter best      (<- slow)

Change-Id: I8cb90ee11b8f981811e013ea4ad5bf72ba3ea7d4
This commit is contained in:
Pascal Massimino
2012-01-08 19:27:21 -08:00
parent ad1e163a0d
commit 8ca2076de1
9 changed files with 179 additions and 153 deletions
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8
src/enc/alpha.c
View File

@ -14,6 +14,7 @@
#include "./vp8enci.h"
#include "../utils/alpha.h"
#include "../utils/filters.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
@ -33,10 +34,15 @@ int VP8EncFinishAlpha(VP8Encoder* enc) {
const WebPPicture* pic = enc->pic_;
uint8_t* tmp_data = NULL;
size_t tmp_size = 0;
const WEBP_FILTER_TYPE filter =
(config->alpha_filtering == 0) ? WEBP_FILTER_NONE :
(config->alpha_filtering == 1) ? WEBP_FILTER_FAST :
WEBP_FILTER_BEST;
assert(pic->a);
if (!EncodeAlpha(pic->a, pic->width, pic->height, pic->a_stride,
config->alpha_quality, config->alpha_compression,
config->alpha_filtering, &tmp_data, &tmp_size)) {
filter, &tmp_data, &tmp_size)) {
return 0;
}
if (tmp_size != (uint32_t)tmp_size) { // Sanity check.

2
src/enc/config.c
View File

@ -42,7 +42,7 @@ int WebPConfigInitInternal(WebPConfig* const config,
config->autofilter = 0;
config->partition_limit = 0;
config->alpha_compression = 1;
config->alpha_filtering = 0;
config->alpha_filtering = 1;
config->alpha_quality = 100;
// TODO(skal): tune.