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libwebp: Fix VP8EncTokenLoop() progress

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Encoding the image found in the user bug report below would result in
a progress rising up to 173% because of the extra 20% caused by each
of the 4 extra lossy passes. It happened at methods 3 to 6.

https://groups.google.com/a/webmproject.org/g/webp-discuss/c/yOiP8APubgc/m/FP3r5X2rDAAJ

Change-Id: I95318d0dc4df546044eb926c786c04bb7f915cbe
(cherry picked from commit db25f1b4ed)
This commit is contained in:
Yannis Guyon 2022-01-18 17:28:19 +01:00 committed by James Zern
parent 827a307fec
commit 6db8248c01
1 changed files with 7 additions and 2 deletions
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9
src/enc/frame_enc.c
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@ -778,6 +778,7 @@ int VP8EncTokenLoop(VP8Encoder* const enc) {
// Roughly refresh the proba eight times per pass
int max_count = (enc->mb_w_ * enc->mb_h_) >> 3;
int num_pass_left = enc->config_->pass;
int remaining_progress = 40; // percents
const int do_search = enc->do_search_;
VP8EncIterator it;
VP8EncProba* const proba = &enc->proba_;
@ -805,6 +806,9 @@ int VP8EncTokenLoop(VP8Encoder* const enc) {
uint64_t size_p0 = 0;
uint64_t distortion = 0;
int cnt = max_count;
// The final number of passes is not trivial to know in advance.
const int pass_progress = remaining_progress / (2 + num_pass_left);
remaining_progress -= pass_progress;
VP8IteratorInit(enc, &it);
SetLoopParams(enc, stats.q);
if (is_last_pass) {
@ -832,7 +836,7 @@ int VP8EncTokenLoop(VP8Encoder* const enc) {
StoreSideInfo(&it);
VP8StoreFilterStats(&it);
VP8IteratorExport(&it);
ok = VP8IteratorProgress(&it, 20);
ok = VP8IteratorProgress(&it, pass_progress);
}
VP8IteratorSaveBoundary(&it);
} while (ok && VP8IteratorNext(&it));
@ -878,7 +882,8 @@ int VP8EncTokenLoop(VP8Encoder* const enc) {
ok = VP8EmitTokens(&enc->tokens_, enc->parts_ + 0,
(const uint8_t*)proba->coeffs_, 1);
}
ok = ok && WebPReportProgress(enc->pic_, enc->percent_ + 20, &enc->percent_);
ok = ok && WebPReportProgress(enc->pic_, enc->percent_ + remaining_progress,
&enc->percent_);
return PostLoopFinalize(&it, ok);
}