522     SkMask      srcM, dstM;  in extractAlpha()  local
527     srcM.fBounds.setWH(this->width(), this->height());  in extractAlpha()
528     srcM.fRowBytes = SkAlign4(this->width());  in extractAlpha()
529     srcM.fFormat = SkMask::kA8_Format;  in extractAlpha()
536         if (!as_MFB(filter)->filterMask(&dstM, srcM, identity, nullptr)) {  in extractAlpha()
542         tmpBitmap.setInfo(SkImageInfo::MakeA8(this->width(), this->height()), srcM.fRowBytes);  in extractAlpha()
549         GetBitmapAlpha(*this, tmpBitmap.getAddr8(0, 0), srcM.fRowBytes);  in extractAlpha()
556     srcM.fImage = SkMask::AllocImage(srcM.computeImageSize());  in extractAlpha()
557     SkAutoMaskFreeImage srcCleanup(srcM.fImage);  in extractAlpha()
559     GetBitmapAlpha(*this, srcM.fImage, srcM.fRowBytes);  in extractAlpha()
560     if (!as_MFB(filter)->filterMask(&dstM, srcM, identity, nullptr)) {  in extractAlpha()