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reValuate/node_modules/@expo/image-utils/build/Ico.js.map
Yamozha 7256d79e2c yeet
2021-04-02 02:24:13 +03:00

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Inspired by https://github.com/kevva/to-ico but reuses existing packages to keep bundle size small.\nimport parsePng from 'parse-png';\n\ntype PNG = {\n data: Buffer;\n width: number;\n height: number;\n bpp: number;\n};\n\nconst constants = {\n directorySize: 16,\n bitmapSize: 40,\n headerSize: 6,\n colorMode: 0,\n};\n\nfunction createHeader(header: number): Buffer {\n const buffer = Buffer.alloc(constants.headerSize);\n\n buffer.writeUInt16LE(0, 0);\n buffer.writeUInt16LE(1, 2);\n buffer.writeUInt16LE(header, 4);\n\n return buffer;\n}\n\nfunction createDirectory(data: PNG, offset: number): Buffer {\n const buffer = Buffer.alloc(constants.directorySize);\n const size = data.data.length + constants.bitmapSize;\n const width = data.width === 256 ? 0 : data.width;\n const height = data.height === 256 ? 0 : data.height;\n const bpp = data.bpp * 8;\n\n buffer.writeUInt8(width, 0);\n buffer.writeUInt8(height, 1);\n buffer.writeUInt8(0, 2);\n buffer.writeUInt8(0, 3);\n buffer.writeUInt16LE(1, 4);\n buffer.writeUInt16LE(bpp, 6);\n buffer.writeUInt32LE(size, 8);\n buffer.writeUInt32LE(offset, 12);\n\n return buffer;\n}\n\nfunction createBitmap(data: PNG, compression: number): Buffer {\n const buffer = Buffer.alloc(constants.bitmapSize);\n\n buffer.writeUInt32LE(constants.bitmapSize, 0);\n buffer.writeInt32LE(data.width, 4);\n buffer.writeInt32LE(data.height * 2, 8);\n buffer.writeUInt16LE(1, 12);\n buffer.writeUInt16LE(data.bpp * 8, 14);\n buffer.writeUInt32LE(compression, 16);\n buffer.writeUInt32LE(data.data.length, 20);\n buffer.writeInt32LE(0, 24);\n buffer.writeInt32LE(0, 28);\n buffer.writeUInt32LE(0, 32);\n buffer.writeUInt32LE(0, 36);\n\n return buffer;\n}\n\nfunction createDIB(data: Buffer, width: number, height: number, bpp: number): Buffer {\n const cols = width * bpp;\n const rows = height * cols;\n const end = rows - cols;\n const buffer = Buffer.alloc(data.length);\n\n for (let row = 0; row < rows; row += cols) {\n for (let col = 0; col < cols; col += bpp) {\n let pos = row + col;\n\n const r = data.readUInt8(pos);\n const g = data.readUInt8(pos + 1);\n const b = data.readUInt8(pos + 2);\n const a = data.readUInt8(pos + 3);\n\n pos = end - row + col;\n\n buffer.writeUInt8(b, pos);\n buffer.writeUInt8(g, pos + 1);\n buffer.writeUInt8(r, pos + 2);\n buffer.writeUInt8(a, pos + 3);\n }\n }\n\n return buffer;\n}\n\nfunction generateFromPNGs(pngs: PNG[]): Buffer {\n const header = createHeader(pngs.length);\n const arr = [header];\n\n let len = header.length;\n let offset = constants.headerSize + constants.directorySize * pngs.length;\n\n for (const png of pngs) {\n const dir = createDirectory(png, offset);\n arr.push(dir);\n len += dir.length;\n offset += png.data.length + constants.bitmapSize;\n }\n\n for (const png of pngs) {\n const header = createBitmap(png, constants.colorMode);\n const dib = createDIB(png.data, png.width, png.height, png.bpp);\n arr.push(header, dib);\n len += header.length + dib.length;\n }\n\n return Buffer.concat(arr, len);\n}\n\nexport async function generateAsync(buffers: Buffer[]): Promise<Buffer> {\n const pngs: PNG[] = await Promise.all(buffers.map(x => parsePng(x)));\n return generateFromPNGs(pngs);\n}\n"]}
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