pw-guild-icon-parser/dist/dds/writer.js

Parser for Perfect World guild icon lists - converts PNG icons to DDS atlas format with DXT5 compression

import { writeFile } from 'fs/promises';
import { compressDXT5 } from './dxt5.js';
const DDS_MAGIC = 0x20534444; // "DDS "
export async function writeDDS(ddsPath, width, height, rgbaData) {
    // Compress to DXT5
    const compressedData = compressDXT5(width, height, rgbaData);
    // Validate compressed data size
    const blockWidth = Math.ceil(width / 4);
    const blockHeight = Math.ceil(height / 4);
    const expectedSize = blockWidth * blockHeight * 16; // 16 bytes per DXT5 block
    if (compressedData.length !== expectedSize) {
        throw new Error(`Invalid compressed data size: expected ${expectedSize}, got ${compressedData.length}`);
    }
    // Ensure linearSize fits in uint32
    const linearSize = compressedData.length;
    if (linearSize < 0 || linearSize > 0xFFFFFFFF) {
        throw new Error(`Linear size out of range: ${linearSize}`);
    }
    // Create DDS header
    const header = createDDSHeader(width, height, linearSize);
    // Combine header and compressed data
    const ddsFile = Buffer.concat([header, compressedData]);
    await writeFile(ddsPath, ddsFile);
}
function createDDSHeader(width, height, linearSize) {
    const header = Buffer.alloc(128);
    let offset = 0;
    // Magic number
    header.writeUInt32LE(DDS_MAGIC, offset);
    offset += 4;
    // DDS_HEADER size
    header.writeUInt32LE(124, offset);
    offset += 4;
    // Flags: DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT | DDSD_LINEARSIZE
    header.writeUInt32LE(0x1 | 0x2 | 0x4 | 0x8 | 0x80000, offset);
    offset += 4;
    // Height
    header.writeUInt32LE(height, offset);
    offset += 4;
    // Width
    header.writeUInt32LE(width, offset);
    offset += 4;
    // PitchOrLinearSize
    header.writeUInt32LE(linearSize, offset);
    offset += 4;
    // Depth
    header.writeUInt32LE(0, offset);
    offset += 4;
    // MipMapCount
    header.writeUInt32LE(1, offset);
    offset += 4;
    // Reserved (11 integers = 44 bytes)
    offset += 44;
    // DDS_PIXELFORMAT
    // Size
    header.writeUInt32LE(32, offset);
    offset += 4;
    // Flags: DDPF_FOURCC
    header.writeUInt32LE(0x4, offset);
    offset += 4;
    // FourCC: "DXT5" (4 bytes ASCII)
    const fourCC = Buffer.from('DXT5', 'ascii');
    fourCC.copy(header, offset, 0, 4);
    offset += 4;
    // RGBBitCount
    header.writeUInt32LE(0, offset);
    offset += 4;
    // RBitMask
    header.writeUInt32LE(0, offset);
    offset += 4;
    // GBitMask
    header.writeUInt32LE(0, offset);
    offset += 4;
    // BBitMask
    header.writeUInt32LE(0, offset);
    offset += 4;
    // ABitMask
    header.writeUInt32LE(0, offset);
    offset += 4;
    // DDS_HEADER continued
    // Caps
    header.writeUInt32LE(0x1000, offset); // DDSCAPS_TEXTURE
    offset += 4;
    // Caps2
    header.writeUInt32LE(0, offset);
    offset += 4;
    // Caps3
    header.writeUInt32LE(0, offset);
    offset += 4;
    // Caps4
    header.writeUInt32LE(0, offset);
    offset += 4;
    // Reserved2
    header.writeUInt32LE(0, offset);
    offset += 4;
    return header;
}
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