채울 곳과 지킬 곳

export async function contentAwareFill(doc:StudioDoc,layer:Layer,options:FillOptions):Promise<StudioDoc>{

 if(!doc.selection)throw Error('Make a selection first.');if(options.output==='new'&&doc.layers.length>=256)throw Error('Up to 256 layers.');if(options.output==='current'&&(layerLocked(doc,layer,'pixels')||layer.kind==='text'||layer.kind==='adjustment'||layer.shape||layer.smartObject||layer.gridWarp||layer.puppet))throw Error('Choose New Layer or an unlocked raster layer.');
 check(options.signal);const edit=await openPixelEdit(options.sample==='all'?doc:{...doc,layers:[layer]}),pixels=edit.image,result=await contentAwarePixels(pixels,doc.selection.alpha,options);check(options.signal);
 if(options.output==='new'){for(let i=0;i<doc.width*doc.height;i++)result[i*4+3]*=doc.selection.alpha[i]/255;const output=await newPixelEditLayer(edit,'Content-Aware Fill',result);check(options.signal);return {...doc,layers:[...doc.layers,output]};}

/** Dynamic-programming seams, including masks, follow the same pixel correspondence. */
export async function carveImage(input:ImageBuffer,width:number,height:number,options:{signal?:AbortSignal;progress?:(n:number)=>void}={}){
 if(!supportedSize(width,height)||!Number.isInteger(width)||!Number.isInteger(height)||!supportedSize(input.width,input.height)||input.data.length!==input.width*input.height*4||input.channels.some(c=>c.length!==input.width*input.height||c.some(v=>!Number.isFinite(v)||v<0||v>255)))throw Error('Invalid content-aware size or channels.');let image:ImageBuffer={...input,data:input.data.slice(),channels:input.channels.map(c=>c.slice())},done=0,total=Math.abs(width-input.width)+Math.abs(height-input.height),yieldAt=performance.now();
 const checkpoint=async()=>{if(options.signal?.aborted)throw new DOMException('Scale canceled.','AbortError');if(performance.now()-yieldAt>16){options.progress?.(total?done/total:1);await new Promise(r=>setTimeout(r,0));yieldAt=performance.now();if(options.signal?.aborted)throw new DOMException('Scale canceled.','AbortError');}};

export async function contentAwareScale(doc:StudioDoc,layer:Layer,options:ScaleOptions):Promise<StudioDoc>{

 if(layerLocked(doc,layer,'pixels')||layerLocked(doc,layer,'position')||layer.kind==='adjustment'||layer.kind==='text'||layer.smartObject||layer.shape||layer.gridWarp||layer.puppet)throw Error('Select an unlocked raster layer. Rasterize type, shapes, Smart Objects or existing warps first.');if(!Number.isInteger(options.anchor)||options.anchor<0||options.anchor>8)throw Error('Invalid scale reference point.');
 const edit=await openPixelEdit(doc,layer),canvas=edit.canvas,pixels=edit.image,selected=options.protect==='$selection'?doc.selection:options.protect?doc.savedSelections?.[options.protect]:undefined;if(options.protect&&!selected)throw Error('Protection selection is unavailable.');const channels=[selected?Float32Array.from(selectionForLayer(selected,layer).alpha):new Float32Array(canvas.width*canvas.height)],maskKeys=(['mask','vectorMask'] as const).filter(k=>layer[k]);for(const key of maskKeys){const m=maskSurface({...layer[key]!,enabled:true},canvas.width,canvas.height),p=m.getContext('2d')!.getImageData(0,0,m.width,m.height).data;channels.push(Float32Array.from({length:m.width*m.height},(_,i)=>p[i*4+3]));}
 const result=await carveImage({width:pixels.width,height:pixels.height,data:pixels.data,channels},options.width,options.height,options);const raster=await closePixelEdit(edit,layer,result.data,result.width,result.height),masks:Partial<Layer>={};if(options.signal?.aborted)throw new DOMException('Scale canceled.','AbortError');maskKeys.forEach((key,i)=>{masks[key]={width:result.width,height:result.height,enabled:layer[key]!.enabled,inverted:false,strokes:[],raster:{width:result.width,height:result.height,alpha:Array.from(result.channels[i+1],Math.round)}};});if(layer.vectorMask){const enabled=maskKeys.filter(key=>layer[key]!.enabled),merge=enabled.length?enabled:maskKeys;masks.mask={width:result.width,height:result.height,enabled:enabled.length>0,inverted:false,strokes:[],raster:{width:result.width,height:result.height,alpha:Array.from({length:result.width*result.height},(_,n)=>Math.round(merge.reduce((a,key)=>a*result.channels[maskKeys.indexOf(key)+1][n]/255,255)))}};masks.vectorMask=undefined;}const next=aroundAnchor(layer,{...raster,...masks,width:result.width,height:result.height},options.anchor);return {...doc,layers:doc.layers.map(l=>l.id===layer.id?next:l)};