"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BMP_HEADER_LENGTH = void 0;
exports.transformImageBuffer = transformImageBuffer;
exports.writeBMPHeader = writeBMPHeader;
exports.uint8ArrayToDataView = uint8ArrayToDataView;
function transformImageBuffer(imageBuffer, sourceOptions, targetOptions, destPadding, imageWidth, imageHeight) {
    const imageBufferView = uint8ArrayToDataView(imageBuffer);
    const byteBuffer = new Uint8Array(destPadding + imageWidth * imageHeight * targetOptions.colorMode.length);
    const byteBufferView = uint8ArrayToDataView(byteBuffer);
    const flipColours = sourceOptions.format.substring(0, 3) !== targetOptions.colorMode.substring(0, 3);
    for (let y = 0; y < imageHeight; y++) {
        const rowOffset = destPadding + imageWidth * targetOptions.colorMode.length * y;
        for (let x = 0; x < imageWidth; x++) {
            // Apply x/y flips
            let x2 = targetOptions.xFlip ? imageWidth - x - 1 : x;
            let y2 = targetOptions.yFlip ? imageHeight - y - 1 : y;
            if (targetOptions.rotate) {
                // Swap x and y
                const tmpX = x2;
                x2 = y2;
                y2 = tmpX;
            }
            const srcOffset = y2 * sourceOptions.stride + sourceOptions.offset + x2 * sourceOptions.format.length;
            const red = imageBufferView.getUint8(srcOffset);
            const green = imageBufferView.getUint8(srcOffset + 1);
            const blue = imageBufferView.getUint8(srcOffset + 2);
            const targetOffset = rowOffset + x * targetOptions.colorMode.length;
            if (flipColours) {
                byteBufferView.setUint8(targetOffset, blue);
                byteBufferView.setUint8(targetOffset + 1, green);
                byteBufferView.setUint8(targetOffset + 2, red);
            }
            else {
                byteBufferView.setUint8(targetOffset, red);
                byteBufferView.setUint8(targetOffset + 1, green);
                byteBufferView.setUint8(targetOffset + 2, blue);
            }
            if (targetOptions.colorMode.length === 4) {
                byteBufferView.setUint8(targetOffset + 3, 255);
            }
        }
    }
    return byteBuffer;
}
exports.BMP_HEADER_LENGTH = 54;
function writeBMPHeader(buf, imageWidth, imageHeight, imageBytes, imagePPM) {
    const bufView = uint8ArrayToDataView(buf);
    // Uses header format BITMAPINFOHEADER https://en.wikipedia.org/wiki/BMP_file_format
    // Bitmap file header
    bufView.setUint8(0, 0x42); // B
    bufView.setUint8(1, 0x4d); // M
    bufView.setUint32(2, imageBytes + 54, true);
    bufView.setInt16(6, 0, true);
    bufView.setInt16(8, 0, true);
    bufView.setUint32(10, 54, true); // Full header size
    // DIB header (BITMAPINFOHEADER)
    bufView.setUint32(14, 40, true); // DIB header size
    bufView.setInt32(18, imageWidth, true);
    bufView.setInt32(22, imageHeight, true);
    bufView.setInt16(26, 1, true); // Color planes
    bufView.setInt16(28, 24, true); // Bit depth
    bufView.setInt32(30, 0, true); // Compression
    bufView.setInt32(34, imageBytes, true); // Image size
    bufView.setInt32(38, imagePPM, true); // Horizontal resolution ppm
    bufView.setInt32(42, imagePPM, true); // Vertical resolution ppm
    bufView.setInt32(46, 0, true); // Colour pallette size
    bufView.setInt32(50, 0, true); // 'Important' Colour count
}
function uint8ArrayToDataView(buffer) {
    return new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength);
}
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