42   WebPIterator prev_iter_;         // Iterator object for previous frame.  member
332   is_key_frame = IsKeyFrame(&iter, &dec->prev_iter_,  in WebPAnimDecoderGetNext()
371     if (dec->prev_iter_.dispose_method == WEBP_MUX_DISPOSE_NONE) {  in WebPAnimDecoderGetNext()
382       assert(dec->prev_iter_.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND);  in WebPAnimDecoderGetNext()
390         FindBlendRangeAtRow(&iter, &dec->prev_iter_, canvas_y, &left1, &width1,  in WebPAnimDecoderGetNext()
408   WebPDemuxReleaseIterator(&dec->prev_iter_);  in WebPAnimDecoderGetNext()
409   dec->prev_iter_ = iter;  in WebPAnimDecoderGetNext()
412   if (dec->prev_iter_.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND) {  in WebPAnimDecoderGetNext()
414                       dec->prev_iter_.x_offset, dec->prev_iter_.y_offset,  in WebPAnimDecoderGetNext()
415                       dec->prev_iter_.width, dec->prev_iter_.height);  in WebPAnimDecoderGetNext()
437     WebPDemuxReleaseIterator(&dec->prev_iter_);  in WebPAnimDecoderReset()
438     memset(&dec->prev_iter_, 0, sizeof(dec->prev_iter_));  in WebPAnimDecoderReset()
451     WebPDemuxReleaseIterator(&dec->prev_iter_);  in WebPAnimDecoderDelete()