@arcgis/core/views/support/TextureCompressionWorker.js

ArcGIS Maps SDK for JavaScript: A complete 2D and 3D mapping and data visualization API

/* COPYRIGHT Esri - https://js.arcgis.com/5.0.8/LICENSE.txt */
import{getBasisEncoder as e,destroyBasisEncoder as t}from"../../libs/basisu/BasisUEncoder.js";import{getDXTEncoder as n,destroyDXTEncoder as r}from"../../libs/dxtEncoder/DXTEncoder.js";import{CompressedTextureFormat as a}from"../webgl/enums.js";let l,s,i=null,o=null;class u{constructor(e,t){this.internalFormat=e,this.compressedTexture=t}}function c(){i=null,l=null,o=null,s=null,t(),r()}async function h(e){let t;t=e.data instanceof ImageBitmap?w(e.data):y(e.data,e.width,e.height,e.components,e.needsFlip);try{if(e.hasS3TC){o||await d();const n=new Uint8Array(t.length);if(o?.encode(t,e.width,e.height,e.preMultiplyAlpha,n)){const e=U(n,!0),t=[n.buffer];return{result:new u(e?.internalFormat??null,e?.textureData??null),transferList:t}}return{result:new u(null,null)}}if(e.hasETC){if(i||await f(),e.preMultiplyAlpha&&!o&&await d(),e.preMultiplyAlpha){const n=new Uint8ClampedArray(t.length);o?.premultiply(new Uint8Array(t),e.width,e.height,n),t=n}const n=p(t,e.width,e.height,e.hasMipmap),r=n?m(n):null,a=r?.compressedTexture?.levels.map(e=>e.buffer)||[];return{result:new u(r?.internalFormat??null,r?.compressedTexture??null),transferList:a}}return{result:new u(null,null)}}finally{t instanceof ImageBitmap&&t.close()}}async function f(){i||(i=await(l??=e()),l=null)}async function d(){o||(o=await(s??=n()),s=null)}function p(e,t,n,r,a=255,l=0,s=!1,o=!1){if(!i)return null;const u=new i.BasisEncoder;u.setPerceptual(!o),u.setCheckForAlpha(!0),u.setForceAlpha(!1),u.setRenormalize(o),u.setMipGen(r),u.setMipSRGB(!o),u.setCreateKTX2File(!0),u.setKTX2SRGBTransferFunc(!o),u.setQualityLevel(a),u.setCompressionLevel(l);const c=new Uint8Array(e.byteLength);u.setSliceSourceImage(0,new Uint8Array(e),t,n,s);const h=u.encode(c),f=new Uint8Array(c.buffer,0,h),d=new i.KTX2File(new Uint8Array(f));return d.isValid()?(u.delete(),f):(d.close(),d.delete(),u.delete(),null)}function m(e){if(!i)return new u(null,null);const t=new i.KTX2File(new Uint8Array(e));t.startTranscoding();const[n,r]=t.getHasAlpha()?[1,a.COMPRESSED_RGBA8_ETC2_EAC]:[0,a.COMPRESSED_RGB8_ETC2],l=t.getLevels(),s=[];for(let a=0;a<l;a++)s.push(new Uint8Array(t.getImageTranscodedSizeInBytes(a,0,0,n))),t.transcodeImage(s[a],a,0,0,n,0,-1,-1);return t.close(),t.delete(),{internalFormat:r,compressedTexture:{type:"compressed",levels:s}}}function w(e){const t=new OffscreenCanvas(e.width,e.height),n=t.getContext("2d");n.drawImage(e,0,0);return n.getImageData(0,0,t.width,t.height).data}function y(e,t,n,r,a){const l=new Uint8ClampedArray(e).subarray(0,t*n*r);if(!a)return l;const s=new Uint8ClampedArray(l.length),i=t*r;for(let o=0;o<n;o++){const e=o*i,t=(n-o-1)*i;s.set(l.subarray(e,e+i),t)}return s}const T=31,A=1,g=2,C=3,E=4,S=7,b=21,_=131072;function D(e){return e.charCodeAt(0)+(e.charCodeAt(1)<<8)+(e.charCodeAt(2)<<16)+(e.charCodeAt(3)<<24)}const M=D("DXT1"),X=D("DXT3"),R=D("DXT5");function U(e,t){const n=new Int32Array(e.buffer,e.byteOffset,T);let r,l;switch(n[b]){case M:r=8,l=a.COMPRESSED_RGB_S3TC_DXT1_EXT;break;case X:r=16,l=a.COMPRESSED_RGBA_S3TC_DXT3_EXT;break;case R:r=16,l=a.COMPRESSED_RGBA_S3TC_DXT5_EXT;break;default:return null}let s=1,i=n[E],o=n[C];(3&i||3&o)&&(i=i+3&-4,o=o+3&-4);const u=i,c=o;let h,f;n[g]&_&&!1!==t&&(s=Math.max(1,n[S]));let d=e.byteOffset+n[A]+4;const p=[];for(let a=0;a<s;++a)f=(i+3>>2)*(o+3>>2)*r,h=new Uint8Array(e.buffer,d,f),p.push(h),d+=f,i=Math.max(1,i>>1),o=Math.max(1,o>>1);return{textureData:{type:"compressed",levels:p},internalFormat:l,width:u,height:c}}export{u as TextureCompressionWorkerOutput,h as compress,p as compressRGBADataToKTX2,m as createTextureDataKTX2,c as destroy,f as initializeBasisEncoder,d as initializeDXTEncoder};