Chromium Direct synthesis of images (IMG elements) on M34, Nativeimageskia: Related code:d raw path

An image can directly compositing if it's the sole content of the layer, and have no box decorations//that require P Ainting. Direct compositing saves backing Store.bool compositedlayermapping::isdirectlycompositedimage () const{    renderobject* RenderObject = renderer ();    if (!renderobject->isimage () | | m_owninglayer->hasboxdecorationsorbackground () | | renderobject->hasclip ())        return false;    renderimage* imagerenderer = Torenderimage (renderobject);    if (imageresource* cachedimage = Imagerenderer->cachedimage ()) {        if (!cachedimage->hasimage ())            return false;        image* image = Cachedimage->imageforrenderer (imagerenderer);        return Image->isbitmapimage ();    }    return false;}

void compositedlayermapping::contentchanged (Contentchangetype changetype) {    if (changetype = = ImageChanged) && Isdirectlycompositedimage ()) {        updateimagecontents ();        return;    }    if ((changetype = = maskimagechanged) && m_masklayer) {        //The composited layer bounds relies on BOX->MASKCL Iprect (), which changes        //When the mask image becomes available.        Updateafterlayout (Compositingchildrenonly | isupdateroot);    }    if (changetype = = Canvaschanged | | changetype = canvaspixelschanged) && Isacceleratedcanvas (Renderer ())) {
   m_graphicslayer->setcontentsneedsdisplay ();        return;}    }

void Compositedlayermapping::updateimagecontents () {    ASSERT (renderer ()->isimage ());    renderimage* imagerenderer = Torenderimage (renderer ());    imageresource* cachedimage = Imagerenderer->cachedimage ();    if (!cachedimage)        return;    image* image = Cachedimage->imageforrenderer (imagerenderer);    if (!image)        return;    We have a to wait until the image was fully loaded before setting it on the layer.    if (!cachedimage->isloaded ())        return;    This is a no-op if the layer doesn ' t has a inner layer for the image.    M_graphicslayer->setcontentstoimage (image);    BOOL Issimplecontainer = false;    Updatedrawscontent (Issimplecontainer);

void Graphicslayer::setcontentstoimage (image* image) {    refptr<nativeimageskia> nativeimage = image? image- >nativeimageforcurrentframe (): 0;    if (nativeimage) {        if (!m_imagelayer) {            M_imagelayer = adoptptr (Platform::current ()->compositorsupport ()- >createimagelayer ());            Registercontentslayer (M_imagelayer->layer ());        }        M_imagelayer->setbitmap (Nativeimage->bitmap ());        M_imagelayer->layer ()->setopaque (Image->currentframeknowntobeopaque ());        Updatecontentsrect ();    } else {        if (m_imagelayer) {            unregistercontentslayer (M_imagelayer->layer ());            M_imagelayer.clear ();        }    }    Setcontentsto (M_imagelayer m_imagelayer->layer (): 0);}

M39 on the contrary is not this behavior, will go Nativeimageskia::d Raw. Of course, M39 on Slimmingpaint and Ganesh (GPU rasterization) are still in continuous refactoring.

Chromium M34 (img element) direct synthesis, do not go Nativeimageskia::d The raw path of the relevant code