fabric
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Object model for HTML5 canvas, and SVG-to-canvas parser. Backed by jsdom and node-canvas.
2 lines • 3.36 kB
JavaScript
import{_defineProperty as e}from"../../_virtual/_@oxc-project_runtime@0.122.0/helpers/defineProperty.min.mjs";import{config as t}from"../config.min.mjs";import{createCanvasElementFor as n}from"../util/misc/dom.min.mjs";var r=class{constructor({tileSize:n=t.textureSize}={}){e(this,`aPosition`,new Float32Array([0,0,0,1,1,0,1,1])),e(this,`resources`,{}),this.tileSize=n,this.setupGLContext(n,n),this.captureGPUInfo()}setupGLContext(e,t){this.dispose(),this.createWebGLCanvas(e,t)}createWebGLCanvas(e,t){let r=n({width:e,height:t}),i=r.getContext(`webgl`,{alpha:!0,premultipliedAlpha:!1,depth:!1,stencil:!1,antialias:!1});i&&(i.clearColor(0,0,0,0),this.canvas=r,this.gl=i)}applyFilters(e,t,n,r,i,a){let o=this.gl,s=i.getContext(`2d`);if(!o||!s)return;let c;a&&(c=this.getCachedTexture(a,t));let l={originalWidth:t.width||t.naturalWidth||0,originalHeight:t.height||t.naturalHeight||0,sourceWidth:n,sourceHeight:r,destinationWidth:n,destinationHeight:r,context:o,sourceTexture:this.createTexture(o,n,r,c?void 0:t),targetTexture:this.createTexture(o,n,r),originalTexture:c||this.createTexture(o,n,r,c?void 0:t),passes:e.length,webgl:!0,aPosition:this.aPosition,programCache:this.programCache,pass:0,filterBackend:this,targetCanvas:i},u=o.createFramebuffer();return o.bindFramebuffer(o.FRAMEBUFFER,u),e.forEach(e=>{e&&e.applyTo(l)}),function(e){let t=e.targetCanvas,n=t.width,r=t.height,i=e.destinationWidth,a=e.destinationHeight;n===i&&r===a||(t.width=i,t.height=a)}(l),this.copyGLTo2D(o,l),o.bindTexture(o.TEXTURE_2D,null),o.deleteTexture(l.sourceTexture),o.deleteTexture(l.targetTexture),o.deleteFramebuffer(u),s.setTransform(1,0,0,1,0,0),l}dispose(){this.canvas&&(this.canvas=null,this.gl=null),this.clearWebGLCaches()}clearWebGLCaches(){this.programCache={},this.textureCache={}}createTexture(e,t,n,r,i){let{NEAREST:a,TEXTURE_2D:o,RGBA:s,UNSIGNED_BYTE:c,CLAMP_TO_EDGE:l,TEXTURE_MAG_FILTER:u,TEXTURE_MIN_FILTER:d,TEXTURE_WRAP_S:f,TEXTURE_WRAP_T:p}=e,m=e.createTexture();return e.bindTexture(o,m),e.texParameteri(o,u,i||a),e.texParameteri(o,d,i||a),e.texParameteri(o,f,l),e.texParameteri(o,p,l),r?e.texImage2D(o,0,s,s,c,r):e.texImage2D(o,0,s,t,n,0,s,c,null),m}getCachedTexture(e,t,n){let{textureCache:r}=this;if(r[e])return r[e];{let i=this.createTexture(this.gl,t.width,t.height,t,n);return i&&(r[e]=i),i}}evictCachesForKey(e){this.textureCache[e]&&(this.gl.deleteTexture(this.textureCache[e]),delete this.textureCache[e])}copyGLTo2D(e,t){let n=e.canvas,r=t.targetCanvas,i=r.getContext(`2d`);if(!i)return;i.translate(0,r.height),i.scale(1,-1);let a=n.height-r.height;i.drawImage(n,0,a,r.width,r.height,0,0,r.width,r.height)}copyGLTo2DPutImageData(e,t){let n=t.targetCanvas.getContext(`2d`),r=t.destinationWidth,i=t.destinationHeight,a=r*i*4;if(!n)return;let o=new Uint8Array(this.imageBuffer,0,a),s=new Uint8ClampedArray(this.imageBuffer,0,a);e.readPixels(0,0,r,i,e.RGBA,e.UNSIGNED_BYTE,o);let c=new ImageData(s,r,i);n.putImageData(c,0,0)}captureGPUInfo(){if(this.gpuInfo)return this.gpuInfo;let e=this.gl,t={renderer:``,vendor:``};if(!e)return t;let n=e.getExtension(`WEBGL_debug_renderer_info`);if(n){let r=e.getParameter(n.UNMASKED_RENDERER_WEBGL),i=e.getParameter(n.UNMASKED_VENDOR_WEBGL);r&&(t.renderer=r.toLowerCase()),i&&(t.vendor=i.toLowerCase())}return this.gpuInfo=t,t}};export{r as WebGLFilterBackend};
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