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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