dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-13 14:34:33 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

multi-threaded alpha encoding for lossy

Browse Source 
new option: 'cwebp -mt ...'
new config flag: config.thread_level
(allowed thread_level are 0 or 1 for now. Maybe more later...)
If -mt is activated (and WEBP_USE_THREAD is used for compile), the alpha-compression
will be done in parallel to RGB coding for lossy. Can save quite a bit of latency...
Has no effect for lossless encoding.

Change-Id: I769d0bf90e7380cf99344ad62cd77277f4df5a46
This commit is contained in:
skal
2013-03-01 01:21:34 +01:00
parent 72655350ea
commit f817930a55
9 changed files with 96 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
src/enc/webpenc.c
View File

@ -125,6 +125,8 @@ static void MapConfigToTools(VP8Encoder* const enc) {
enc->max_i4_header_bits_ =
256 * 16 * 16 * // upper bound: up to 16bit per 4x4 block
(limit * limit) / (100 * 100); // ... modulated with a quadratic curve.
enc->thread_level_ = enc->config_->thread_level;
}
// Memory scaling with dimensions:
@ -266,14 +268,16 @@ static VP8Encoder* InitVP8Encoder(const WebPConfig* const config,
return enc;
}
static void DeleteVP8Encoder(VP8Encoder* enc) {
static int DeleteVP8Encoder(VP8Encoder* enc) {
int ok = 1;
if (enc != NULL) {
VP8EncDeleteAlpha(enc);
ok = VP8EncDeleteAlpha(enc);
#ifdef WEBP_EXPERIMENTAL_FEATURES
VP8EncDeleteLayer(enc);
#endif
free(enc);
}
return ok;
}
//------------------------------------------------------------------------------
@ -336,7 +340,7 @@ int WebPReportProgress(const WebPPicture* const pic,
//------------------------------------------------------------------------------
int WebPEncode(const WebPConfig* config, WebPPicture* pic) {
int ok;
int ok = 0;
if (pic == NULL)
return 0;
@ -365,19 +369,21 @@ int WebPEncode(const WebPConfig* config, WebPPicture* pic) {
enc = InitVP8Encoder(config, pic);
if (enc == NULL) return 0; // pic->error is already set.
// Note: each of the tasks below account for 20% in the progress report.
ok = VP8EncAnalyze(enc)
&& VP8StatLoop(enc)
&& VP8EncLoop(enc)
&& VP8EncFinishAlpha(enc)
ok = VP8EncAnalyze(enc);
// Analysis is done, proceed to actual coding.
ok = ok && VP8EncStartAlpha(enc); // possibly done in parallel
ok = ok && VP8StatLoop(enc) && VP8EncLoop(enc);
ok = ok && VP8EncFinishAlpha(enc);
#ifdef WEBP_EXPERIMENTAL_FEATURES
&& VP8EncFinishLayer(enc)
ok = ok && VP8EncFinishLayer(enc);
#endif
&& VP8EncWrite(enc);
ok = ok && VP8EncWrite(enc);
StoreStats(enc);
if (!ok) {
VP8EncFreeBitWriters(enc);
}
DeleteVP8Encoder(enc);
ok &= DeleteVP8Encoder(enc); // must always be called, even if !ok
} else {
if (pic->argb == NULL)
return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER);