// luma.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
/**
 * Flip rows (can be used on arrays returned from `Framebuffer.readPixels`)
 * https: *stackoverflow.com/questions/41969562/
 * how-can-i-flip-the-result-of-webglrenderingcontext-readpixels
 * @param param0
 */
export function flipRows(options) {
    const { data, width, height, bytesPerPixel = 4, temp } = options;
    const bytesPerRow = width * bytesPerPixel;
    // make a temp buffer to hold one row
    const tempBuffer = temp || new Uint8Array(bytesPerRow);
    for (let y = 0; y < height / 2; ++y) {
        const topOffset = y * bytesPerRow;
        const bottomOffset = (height - y - 1) * bytesPerRow;
        // make copy of a row on the top half
        tempBuffer.set(data.subarray(topOffset, topOffset + bytesPerRow));
        // copy a row from the bottom half to the top
        data.copyWithin(topOffset, bottomOffset, bottomOffset + bytesPerRow);
        // copy the copy of the top half row to the bottom half
        data.set(tempBuffer, bottomOffset);
    }
}
export function scalePixels(options) {
    const { data, width, height } = options;
    const newWidth = Math.round(width / 2);
    const newHeight = Math.round(height / 2);
    const newData = new Uint8Array(newWidth * newHeight * 4);
    for (let y = 0; y < newHeight; y++) {
        for (let x = 0; x < newWidth; x++) {
            for (let c = 0; c < 4; c++) {
                newData[(y * newWidth + x) * 4 + c] = data[(y * 2 * width + x * 2) * 4 + c];
            }
        }
    }
    return { data: newData, width: newWidth, height: newHeight };
}