545     SkMaskBuilder      srcM, dstM;  in extractAlpha()  local
550     srcM.bounds().setWH(this->width(), this->height());  in extractAlpha()
551     srcM.rowBytes() = SkAlign4(this->width());  in extractAlpha()
552     srcM.format() = SkMask::kA8_Format;  in extractAlpha()
559         if (!as_MFB(filter)->filterMask(&dstM, srcM, identity, nullptr)) {  in extractAlpha()
565         tmpBitmap.setInfo(SkImageInfo::MakeA8(this->width(), this->height()), srcM.fRowBytes);  in extractAlpha()
572         GetBitmapAlpha(*this, tmpBitmap.getAddr8(0, 0), srcM.fRowBytes);  in extractAlpha()
579     srcM.image() = SkMaskBuilder::AllocImage(srcM.computeImageSize());  in extractAlpha()
580     SkAutoMaskFreeImage srcCleanup(srcM.image());  in extractAlpha()
582     GetBitmapAlpha(*this, srcM.image(), srcM.fRowBytes);  in extractAlpha()
583     if (!as_MFB(filter)->filterMask(&dstM, srcM, identity, nullptr)) {  in extractAlpha()