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Add progress hook granularity in lossless

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A WebPPicture instance is necessary to call WebPReportProgress() which
sets WebPPicture::error_code so as well use WebPEncodingSetError() to
record errors too, instead of functions returning a WebPEncodingError.
However there must be one WebPPicture instance per thread, with error
codes merged at sync time. A mutex could simplify that but it is not
the objective of this change.

https://groups.google.com/a/webmproject.org/g/webp-discuss/c/yOiP8APubgc/m/vCTvxl6ODgAJ

Change-Id: Ia1a8f9d1199202e1c88484ce719b0180a80447ce
This commit is contained in:
Yannis Guyon
2022-02-02 14:39:21 +01:00
parent 26139c7398
commit ec178f2c7f
9 changed files with 414 additions and 284 deletions
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2
src/enc/alpha_enc.c
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@ -86,7 +86,7 @@ static int EncodeLossless(const uint8_t* const data, int width, int height,
// a decoder bug related to alpha with color cache.
// See: https://code.google.com/p/webp/issues/detail?id=239
// Need to re-enable this later.
ok = (VP8LEncodeStream(&config, &picture, bw, 0 /*use_cache*/) == VP8_ENC_OK);
ok = VP8LEncodeStream(&config, &picture, bw, /*use_cache=*/0);
WebPPictureFree(&picture);
ok = ok && !bw->error_;
if (!ok) {