Function extractBlockGridNearest

web/js/algorithms.js:207–225

(imageData, blockSize)

}

function extractBlockGridNearest(imageData, blockSize) {
    const { width, height } = imageData;
    const d = imageData.data;
    const cols = Math.ceil(width / blockSize);
    const rows = Math.ceil(height / blockSize);
    const grid = [];

    for (let row = 0; row < rows; row++) {
        grid[row] = [];
        for (let col = 0; col < cols; col++) {
            const x0 = col * blockSize, y0 = row * blockSize;
            const cx = Math.min(x0 + Math.floor(blockSize / 2), width - 1);
            const cy = Math.min(y0 + Math.floor(blockSize / 2), height - 1);
            const idx = (cy * width + cx) * 4;
            grid[row][col] = [d[idx], d[idx + 1], d[idx + 2]];
        }
    }
    return { grid, cols, rows };
}

function paintBlockGrid(grid, rows, cols, imageData, blockSize) {
    const { width, height } = imageData;