Method detectPixelBlockSize

pixelizer.js:269–285

* 检测像素块大小

(imageData)

     * 检测像素块大小
     */
    detectPixelBlockSize(imageData) {
        const { data, width, height } = imageData;
        
        // 1. 水平扫描线分析
        const horizontalSizes = this.analyzeHorizontalScanlines(data, width, height);
        
        // 2. 垂直扫描线分析  
        const verticalSizes = this.analyzeVerticalScanlines(data, width, height);
        
        // 3. 综合分析
        const candidates = this.findCommonSizes(horizontalSizes, verticalSizes);
        
        // 4. 验证候选大小
        const bestCandidate = this.validateCandidates(imageData, candidates);
        
        return bestCandidate;
    }

    analyzeHorizontalScanlines(data, width, height) {
        const sizes = [];