This package currently offers a very minimal PNG encoder for uncompressed RGB and RGBA PNG files.
It does not rely on any frameworks and should work on all Swift supported platforms.
Some of the work is based on this implementation: https://github.com/jamesbowman/pngout/blob/master/pngout.c
let width = UInt32(512)
let height = UInt32(512)
var imageData: [UInt32] = .init(repeating: 0, count: Int(width * height))
var index = 0
for y: UInt32 in 0 ..< height {
for x: UInt32 in 0 ..< width {
let r: UInt32 = y & 0xFF
let g: UInt32 = x & 0xFF
let b: UInt32 = (0xFF - x & 0xFF)
imageData[index] = (r << 16) + (g << 8) + (b << 0)
index += 1
}
}
let encoder = MicroPNG()
let pngData = try! encoder.encodeRGBUncompressed(data: imageData,
width: width,
height: height)
pngData.withUnsafeBytes { pointer in
let data = Data(bytes: pointer.baseAddress!, count: pointer.count)
try! data.write(to: URL(fileURLWithPath: "EXPORT PATH"))
}