fabric/dist/src/filters/Resize.min.mjs

Object model for HTML5 canvas, and SVG-to-canvas parser. Backed by jsdom and node-canvas.

import{_defineProperty as e}from"../../_virtual/_@oxc-project_runtime@0.122.0/helpers/defineProperty.min.mjs";import{classRegistry as t}from"../ClassRegistry.min.mjs";import{createCanvasElement as n}from"../util/misc/dom.min.mjs";import{isWebGLPipelineState as r}from"./utils.min.mjs";import{BaseFilter as i}from"./BaseFilter.min.mjs";var a=class extends i{sendUniformData(e,t){e.uniform2fv(t.uDelta,this.horizontal?[1/this.width,0]:[0,1/this.height]),e.uniform1fv(t.uTaps,this.taps)}getFilterWindow(){let e=this.tempScale;return Math.ceil(this.lanczosLobes/e)}getCacheKey(){let e=this.getFilterWindow();return`${this.type}_${e}`}getFragmentSource(){let e=this.getFilterWindow();return this.generateShader(e)}getTaps(){let e=this.lanczosCreate(this.lanczosLobes),t=this.tempScale,n=this.getFilterWindow(),r=Array(n);for(let i=1;i<=n;i++)r[i-1]=e(i*t);return r}generateShader(e){let t=Array(e);for(let n=1;n<=e;n++)t[n-1]=`${n}.0 * uDelta`;return`\n      precision highp float;\n      uniform sampler2D uTexture;\n      uniform vec2 uDelta;\n      varying vec2 vTexCoord;\n      uniform float uTaps[${e}];\n      void main() {\n        vec4 color = texture2D(uTexture, vTexCoord);\n        float sum = 1.0;\n        ${t.map((e,t)=>`\n              color += texture2D(uTexture, vTexCoord + ${e}) * uTaps[${t}] + texture2D(uTexture, vTexCoord - ${e}) * uTaps[${t}];\n              sum += 2.0 * uTaps[${t}];\n            `).join(`
`)}\n        gl_FragColor = color / sum;\n      }\n    `}applyToForWebgl(e){e.passes++,this.width=e.sourceWidth,this.horizontal=!0,this.dW=Math.round(this.width*this.scaleX),this.dH=e.sourceHeight,this.tempScale=this.dW/this.width,this.taps=this.getTaps(),e.destinationWidth=this.dW,super.applyTo(e),e.sourceWidth=e.destinationWidth,this.height=e.sourceHeight,this.horizontal=!1,this.dH=Math.round(this.height*this.scaleY),this.tempScale=this.dH/this.height,this.taps=this.getTaps(),e.destinationHeight=this.dH,super.applyTo(e),e.sourceHeight=e.destinationHeight}applyTo(e){r(e)?this.applyToForWebgl(e):this.applyTo2d(e)}isNeutralState(){return this.scaleX===1&&this.scaleY===1}lanczosCreate(e){return t=>{if(t>=e||t<=-e)return 0;if(t<1.1920929e-7&&t>-1.1920929e-7)return 1;let n=(t*=Math.PI)/e;return Math.sin(t)/t*Math.sin(n)/n}}applyTo2d(e){let t=e.imageData,n=this.scaleX,r=this.scaleY;this.rcpScaleX=1/n,this.rcpScaleY=1/r;let i=t.width,a=t.height,o=Math.round(i*n),s=Math.round(a*r),c;c=this.resizeType===`sliceHack`?this.sliceByTwo(e,i,a,o,s):this.resizeType===`hermite`?this.hermiteFastResize(e,i,a,o,s):this.resizeType===`bilinear`?this.bilinearFiltering(e,i,a,o,s):this.resizeType===`lanczos`?this.lanczosResize(e,i,a,o,s):new ImageData(o,s),e.imageData=c}sliceByTwo(e,t,r,i,a){let o=e.imageData,s=.5,c=!1,l=!1,u=t*s,d=r*s,f=e.filterBackend.resources,p=0,m=0,h=t,g=0;f.sliceByTwo||(f.sliceByTwo=n());let _=f.sliceByTwo;(_.width<1.5*t||_.height<r)&&(_.width=1.5*t,_.height=r);let v=_.getContext(`2d`);for(v.clearRect(0,0,1.5*t,r),v.putImageData(o,0,0),i=Math.floor(i),a=Math.floor(a);!c||!l;)t=u,r=d,i<Math.floor(u*s)?u=Math.floor(u*s):(u=i,c=!0),a<Math.floor(d*s)?d=Math.floor(d*s):(d=a,l=!0),v.drawImage(_,p,m,t,r,h,g,u,d),p=h,m=g,g+=d;return v.getImageData(p,m,i,a)}lanczosResize(e,t,n,r,i){let a=e.imageData.data,o=e.ctx.createImageData(r,i),s=o.data,c=this.lanczosCreate(this.lanczosLobes),l=this.rcpScaleX,u=this.rcpScaleY,d=2/this.rcpScaleX,f=2/this.rcpScaleY,p=Math.ceil(l*this.lanczosLobes/2),m=Math.ceil(u*this.lanczosLobes/2),h={},g={x:0,y:0},_={x:0,y:0};return function e(v){let y,b,x,S,C,w,T,E,D,O,k;for(g.x=(v+.5)*l,_.x=Math.floor(g.x),y=0;y<i;y++){for(g.y=(y+.5)*u,_.y=Math.floor(g.y),C=0,w=0,T=0,E=0,D=0,b=_.x-p;b<=_.x+p;b++)if(!(b<0||b>=t)){O=Math.floor(1e3*Math.abs(b-g.x)),h[O]||(h[O]={});for(let e=_.y-m;e<=_.y+m;e++)e<0||e>=n||(k=Math.floor(1e3*Math.abs(e-g.y)),h[O][k]||(h[O][k]=c(Math.sqrt((O*d)**2+(k*f)**2)/1e3)),x=h[O][k],x>0&&(S=4*(e*t+b),C+=x,w+=x*a[S],T+=x*a[S+1],E+=x*a[S+2],D+=x*a[S+3]))}S=4*(y*r+v),s[S]=w/C,s[S+1]=T/C,s[S+2]=E/C,s[S+3]=D/C}return++v<r?e(v):o}(0)}bilinearFiltering(e,t,n,r,i){let a,o,s,c,l,u,d,f,p,m,h,g,_,v=0,y=this.rcpScaleX,b=this.rcpScaleY,x=4*(t-1),S=e.imageData.data,C=e.ctx.createImageData(r,i),w=C.data;for(d=0;d<i;d++)for(f=0;f<r;f++)for(l=Math.floor(y*f),u=Math.floor(b*d),p=y*f-l,m=b*d-u,_=4*(u*t+l),h=0;h<4;h++)a=S[_+h],o=S[_+4+h],s=S[_+x+h],c=S[_+x+4+h],g=a*(1-p)*(1-m)+o*p*(1-m)+s*m*(1-p)+c*p*m,w[v++]=g;return C}hermiteFastResize(e,t,n,r,i){let a=this.rcpScaleX,o=this.rcpScaleY,s=Math.ceil(a/2),c=Math.ceil(o/2),l=e.imageData.data,u=e.ctx.createImageData(r,i),d=u.data;for(let e=0;e<i;e++)for(let n=0;n<r;n++){let i=4*(n+e*r),u=0,f=0,p=0,m=0,h=0,g=0,_=0,v=(e+.5)*o;for(let r=Math.floor(e*o);r<(e+1)*o;r++){let e=Math.abs(v-(r+.5))/c,i=(n+.5)*a,o=e*e;for(let e=Math.floor(n*a);e<(n+1)*a;e++){let n=Math.abs(i-(e+.5))/s,a=Math.sqrt(o+n*n);a>1&&a<-1||(u=2*a*a*a-3*a*a+1,u>0&&(n=4*(e+r*t),_+=u*l[n+3],p+=u,l[n+3]<255&&(u=u*l[n+3]/250),m+=u*l[n],h+=u*l[n+1],g+=u*l[n+2],f+=u))}}d[i]=m/f,d[i+1]=h/f,d[i+2]=g/f,d[i+3]=_/p}return u}};e(a,`type`,`Resize`),e(a,`defaults`,{resizeType:`hermite`,scaleX:1,scaleY:1,lanczosLobes:3}),e(a,`uniformLocations`,[`uDelta`,`uTaps`]),t.setClass(a);export{a as Resize};
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