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2 lines
42 KiB
2 lines
42 KiB
3 years ago
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/* Copyright 2015-2021 Esri. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 @preserve */
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(function(){var LercDecode=function(){var CntZImage={};CntZImage.defaultNoDataValue=-34027999387901484e22;CntZImage.decode=function(input,options){options=options||{};var skipMask=options.encodedMaskData||options.encodedMaskData===null;var parsedData=parse(input,options.inputOffset||0,skipMask);var noDataValue=options.noDataValue!==null?options.noDataValue:CntZImage.defaultNoDataValue;var uncompressedData=uncompressPixelValues(parsedData,options.pixelType||Float32Array,options.encodedMaskData,noDataValue,options.returnMask);var result={width:parsedData.width,height:parsedData.height,pixelData:uncompressedData.resultPixels,minValue:uncompressedData.minValue,maxValue:parsedData.pixels.maxValue,noDataValue:noDataValue};if(uncompressedData.resultMask){result.maskData=uncompressedData.resultMask}if(options.returnEncodedMask&&parsedData.mask){result.encodedMaskData=parsedData.mask.bitset?parsedData.mask.bitset:null}if(options.returnFileInfo){result.fileInfo=formatFileInfo(parsedData);if(options.computeUsedBitDepths){result.fileInfo.bitDepths=computeUsedBitDepths(parsedData)}}return result};var uncompressPixelValues=function(data,TypedArrayClass,maskBitset,noDataValue,storeDecodedMask){var blockIdx=0;var numX=data.pixels.numBlocksX;var numY=data.pixels.numBlocksY;var blockWidth=Math.floor(data.width/numX);var blockHeight=Math.floor(data.height/numY);var scale=2*data.maxZError;var minValue=Number.MAX_VALUE,currentValue;maskBitset=maskBitset||(data.mask?data.mask.bitset:null);var resultPixels,resultMask;resultPixels=new TypedArrayClass(data.width*data.height);if(storeDecodedMask&&maskBitset){resultMask=new Uint8Array(data.width*data.height)}var blockDataBuffer=new Float32Array(blockWidth*blockHeight);var xx,yy;for(var y=0;y<=numY;y++){var thisBlockHeight=y!==numY?blockHeight:data.height%numY;if(thisBlockHeight===0){continue}for(var x=0;x<=numX;x++){var thisBlockWidth=x!==numX?blockWidth:data.width%numX;if(thisBlockWidth===0){continue}var outPtr=y*data.width*blockHeight+x*blockWidth;var outStride=data.width-thisBlockWidth;var block=data.pixels.blocks[blockIdx];var blockData,blockPtr,constValue;if(block.encoding<2){if(block.encoding===0){blockData=block.rawData}else{unstuff(block.stuffedData,block.bitsPerPixel,block.numValidPixels,block.offset,scale,blockDataBuffer,data.pixels.maxValue);blockData=blockDataBuffer}blockPtr=0}else if(block.encoding===2){constValue=0}else{constValue=block.offset}var maskByte;if(maskBitset){for(yy=0;yy<thisBlockHeight;yy++){if(outPtr&7){maskByte=maskBitset[outPtr>>3];maskByte<<=outPtr&7}for(xx=0;xx<thisBlockWidth;xx++){if(!(outPtr&7)){maskByte=maskBitset[outPtr>>3]}if(maskByte&128){if(resultMask){resultMask[outPtr]=1}currentValue=block.encoding<2?blockData[blockPtr++]:constValue;minValue=minValue>currentValue?currentValue:minValue;resultPixels[outPtr++]=currentValue}else{if(resultMask){resultMask[outPtr]=0}resultPixels[outPtr++]=noDataValue}maskByte<<=1}outPtr+=outStride}}else{if(block.encoding<2){for(yy=0;yy<thisBlockHeight;yy++){for(xx=0;xx<thisBlockWidth;xx++){currentValue=blockData[blockPtr++];minValue=minValue>currentValue?currentValue:minValue;resultPixels[outPtr++]=currentValue}outPtr+=outStride}}else{minValue=minValue>constValue?constValue:minValue;for(yy=0;yy<thisBlockHeight;yy++){for(xx=0;xx<thisBlockWidth;xx++){resultPixels[outPtr++]=constValue}outPtr+=outStride}}}if(block.encoding===1&&blockPtr!==block.numValidPixels){throw"Block and Mask do not match"}blockIdx++}}return{resultPixels:resultPixels,resultMask:resultMask,minValue:minValue}};var formatFileInfo=function(data){return{fileIdentifierString:data.fileIdentifierString,fileVersion:data.fileVersion,imageType:data.imageType,height:data.height,width:data.width,maxZError:data.maxZError,eofOffset:data.eofOffset,mask:data.mask?{numBlocksX:data.mask.numBlocksX,numBlocksY:data.mask.numBlocksY,numBytes:data.mask.numBytes,maxValue:data.mask.maxValue}:null,pixels:{numBlocksX:data.pixels.numBlocksX,numBlocksY:data.pixels.numBlocksY,numBytes:data.pixels.numBytes,maxValue:data.pixels.maxValue,noDataValue:data.noDataValue}}};var computeUsedBitDepths=
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