Method pixelateToWidth

pixelizer.js:646–659

* 像素化到指定宽度

(sourceCanvas, targetWidth)

     * 像素化到指定宽度
     */
    pixelateToWidth(sourceCanvas, targetWidth) {
        const aspectRatio = sourceCanvas.height / sourceCanvas.width;
        const targetHeight = Math.round(targetWidth * aspectRatio);
        
        const targetCanvas = document.createElement('canvas');
        targetCanvas.width = targetWidth;
        targetCanvas.height = targetHeight;
        const targetCtx = targetCanvas.getContext('2d');
        
        targetCtx.imageSmoothingEnabled = false;
        targetCtx.drawImage(sourceCanvas, 0, 0, targetWidth, targetHeight);
        
        return targetCanvas;
    }

    /**
     * 应用颜色量化