提交 Downsampler 类
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sijainguo
parent
15401bbc32
commit
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/*
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/*
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* asdfasdfasdfasdfasdf*/
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* asdfasdfasdfasdfasdf*/
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import { CenterOutside, FitCenter, SampleSizeRounding } from './Downsamplestrategy';
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import { FileTypeutil } from '../../utits/Fitetypeutit';
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import { Request0ption } from '../../Requestoption';
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let TAG = 'downsampling'
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export class Downsampler {
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calculateScaling(
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imageType: ArrayBuffer,
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sourceHeight:number,
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sourceWidth:number,
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request?: RequestOption
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):ESObject {
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const fileType: string | null = new FileTypeUtil().getFileType(imageType)
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let powerOfTwoWidth: number | null = null;
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let powerOfTwoHeight: number | null = null;
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let targetWidth: number = 0
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let targetHeight: number = 0
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if (request?.size.width && !request?.size.height) {
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targetWidth = this.round((request?.size.height) * sourceWidth / sourceHeight)
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} else if (request?.size.height && !request?.size.width) {
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targetHeight = this.round((request?.size.width) * sourceHeight / sourceWidth)
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} else if (request?.size.height && request?.size.width) {
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targetHeight = request.size.height;
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targetWidth = request?.size.width;
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} else {
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console.log('宽高都不存在')
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}
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if (sourceWidth <= 0 || sourceleight <= 0) return;
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let orientedSourceWidth = sourceWidth;
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let orientedSourceHeight = sourceHeight;
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if (this.isRotationRequired(90)) {
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orientedSourceWidth = sourceHeight;
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orientedSourceHeight = sourceWidth;
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}
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/*安卓的模式*/
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let exactScaleFactor: number = FitCenter.getScaleFactor(orientedSourceWidth, orientedSourceHeight, targetWidth, targetHeight)
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if (exactScaleFactor <= 0) {
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throw new Error("Cannot round with exactScaleFactor");
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console.log('exactScaleFactor', exactScaleFactor)
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/*安卓的模式*/
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let rounding: SampleSizeRounding = Center0utside.getSampleSizeRounding(orientedSourceWidth, orientedSourceHeight, targetWidth, targetHeight)
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if (rounding == null) {
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throw new Error("Cannot round with null rounding");
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}
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let outWidth: number = this.round(exactScaleFactor * orientedSourceWidth);
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let outHeight: number = this.round(exactScaleFactor * orientedSourceHeight);
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let widthScaleFactor = Math.floor(orientedSourceWidth / outWidth);
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let heightScaleFactor = Math.floor(orientedSourceHeight / outHeight);
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let scaleFactor = rounding == SampleSizeRounding.MEMORY ? Math.max(widthScaleFactor, heightScaleFactor) : Math.min(widthScaleFactor, heightScaleFactor)
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let powerOfTwoSampleSize: number;
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powerOfTwoSampleSize = Math.max(1, this.highestOneBit(scaleFactor));
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if (fileType == "JPEG") {
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let nativeScaling = Hath.min(powerOfTwoSampleSize, 8);
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powerOfTwoWidth = Math.ceil(orientedSourceWidth / nativeScaling);
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powerOfTwoHeight = Math.ceil(orientedSourceHeight / nativeScaling);
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let secondaryScaling = Math.floor(powerOfTwoSampleSize / 8);
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if (secondaryScaling > 0) {
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powerOfTwoWidth = powerOfTwoWidth / secondaryScaling;
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powerOfTwoHeight = powerOfTwoHeight / secondaryScaling;
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}
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} else if (fileType == "PNG") {
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powerOfTwoWidth = Math.floor(orientedSourceWidth / powerOfTwoSampleSize);
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PowerOfTwoHeight = Math.floor(orientedSourceHeight / powerOfTwoSamplesize);
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console.log('执行了没', powerOfTwoHeight, powerOfTwoWidth)
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} else if (fileType == "WEBP") {
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powerOfTwoWidth = Math.round(orientedSourceWidth / powerOfTwoSampleSize);
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poWerOfTwoHeight = Math.round(orientedSourceHeight / powerOfTwoSampleSize);
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} else if (
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orientedSourceWidth % powerOfTwoSampleSize != 0 || orientedSourceHeight % powerOfTwoSampleSize != 0) {
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// let dimensions; number[] = this.getDimensions(imageReader, options, decodeCallbacks,bitmapPool);
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// powerOfTwoWidth = dimensions[0];
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// powerofTwoHeight = dimensions[1];
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} else {
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powerOfTwoWidth = orientedSourceWidth / powerOfTwoSampleSize;
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powerOfTwoHeight = orientedSourceHeight / powerOfTwoSampleSize;
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}
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// Let adjustedScaleFactor = downsampleStrategy.getScaleFactor(powerOfTwoWidth, powerOfTwoHeight, targetWidth, targetHeight);
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// Density scaling is only supported if inBitmap is null prior to KitKat. Avoid setting
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// densities here so we calculate the final Bitmap size correctly.
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// if (Build.VERSION,SDK_INT >=Build.VERSION_CODES.KITKAT) {
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// options.inTargetDensity = this.adjustTargetDensityForError(adjustedScaleFactor);
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// options,inDensity = this.getDensityMultiplier(adjustedScaleFactor);
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//}
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// if (this.isScaling(options)){
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// options.inScaled = true;
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// }else {
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// options.inDensity = options.inTargetDensity =0;
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// }
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//}
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let a: ESObject = { "targetWidth": power0fTwoWidth, "targetHeight": powerOfTuoHeight }
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return a
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}
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//decodeStream(imageReader:ImageReader, options: ESObject, callbacks: DecodeCallbacks, bitmapPool: ESObject) {
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//if (!options.inJustDecodeBounds){
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// callbacks.onObtainBounds();
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// imageReader.stopGrowingBuffers();
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// }
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// }
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// getDimensions(imageReader: ImageReader, options: ESObject, decodeCallbacks: DecodeCallbacks, bitmapPool: ESObject):number[] {
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// options.inJustDecodeBounds = true;
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// this.decodeStream(imageReader, options, decodeCallbacks, bitmapPool);
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// options.inJustDecodeBounds =false;
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// return new Array(options.outWidth, options,outHeight);
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//
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// }
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highest0neBit(i: number): number{
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i |= (i >> 1);
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i |= (i >> 2);
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i |= (i >> 4);
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i |= (i >> 8);
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i |= (i >> 16);
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return i - (i >>> 1);
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}
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round(value: number): number {
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return Math.floor(value +0.5);
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}
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isRotationRequired(degreesToRotate: number): boolean{
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return degreesToRotate == 90 || degreesToRotate == 270;
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// isScaling(options: ESObject): boolean {
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// return options.inTargetDensity >0
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// && options.inDensity>0
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// && options.inTargetDensity != options.inDensity;
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//}
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getDensityMultiplier(adjustedScaleFactor: number):number{
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return Math.round(Number.MAX_VALUE * (adjustedScaleFactor <= 1 ? adjustedScaleFactor : 1 / adjustedScaleFactor));
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}
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adjustTargetDensityForError(adjustedScaleFactor:number):number{
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let densityMultiplier = this.getDensityMultiplier(adjustedScaleFactor);
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let targetDensity = this.round(densityMultiplier * adjustedScaleFactor);
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let scaleFactorWithError = targetDensity / densityMultiplier;
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let difference = adjustedScaleFactor / scaleFactorWithError;
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return this.round(difference * targetDensity);
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}
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}
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