public byte[] ToPng(CImageByte img)
{
if (img.Channel != 4)
return null;
Bitmap bitmap = Bitmap.CreateBitmap((int)img.Width, (int)img.Height, Bitmap.Config.Argb8888);
var byteBuffer = Java.Nio.ByteBuffer.Wrap(img.Bytes);
bitmap.CopyPixelsFromBuffer(byteBuffer);
MemoryStream stream = new MemoryStream();
bitmap.Compress(Bitmap.CompressFormat.Png, 50, stream);
return stream.ToArray();
}
public byte[] ToPng(CImageByte img)
{
var provider = new CGDataProvider(img.Bytes, 0, (int)img.Length);
int bitsPerComponent = 8;
int components = (int)img.Channel;
int bitsPerPixel = components * bitsPerComponent;
int bytesPerRow = (int)img.Stride;
// Tip: When you create a bitmap graphics context,
// you’ll get the best performance if you make sure the data and bytesPerRow are 16-byte aligned.
bool shouldInterpolate = false;
var colorSpace = CGColorSpace.CreateDeviceRGB();
var cgImage = new CGImage(
(int)img.Width, (int)img.Height, bitsPerComponent, bitsPerPixel, bytesPerRow,
colorSpace, CGImageAlphaInfo.PremultipliedLast, provider,
null, shouldInterpolate, CGColorRenderingIntent.Default);
var uimg = UIImage.FromImage(cgImage);
Console.WriteLine("topng info: " + uimg.Size.ToString());
return uimg.AsPNG().ToArray();
}
static public CImageBuffer CImageByteToBuffer(CImageByte img)
{
return new CImageBuffer(img.Bytes, img.Width, img.Channel);
}
public void AddImage(CImageByte img)
{
imgs.Add(img);
}