public override void Draw(CGRect rect)
{
base.Draw(rect);
var screenScale = UIScreen.MainScreen.Scale;
var width = (int)(Bounds.Width * screenScale);
var height = (int)(Bounds.Height * screenScale);
IntPtr buff = System.Runtime.InteropServices.Marshal.AllocCoTaskMem(width * height * 4);
try {
using (var surface = SKSurface.Create(width, height, SKColorType.Rgba8888 /*N_32*/, SKAlphaType.Premul, buff, width * 4)) {
var skcanvas = surface.Canvas;
skcanvas.Scale((float)screenScale, (float)screenScale);
using (new SKAutoCanvasRestore(skcanvas, true)) {
_tateView.SendDraw(skcanvas);
}
}
using (var colorSpace = CGColorSpace.CreateDeviceRGB())
using (var bContext = new CGBitmapContext(buff, width, height, 8, width * 4, colorSpace, (CGImageAlphaInfo)bitmapInfo))
using (var image = bContext.ToImage())
using (var context = UIGraphics.GetCurrentContext()) {
// flip the image for CGContext.DrawImage
context.TranslateCTM(0, Frame.Height);
context.ScaleCTM(1, -1);
context.DrawImage(Bounds, image);
}
} finally {
if (buff != IntPtr.Zero)
{
System.Runtime.InteropServices.Marshal.FreeCoTaskMem(buff);
}
}
}
protected override void OnDraw(Android.Graphics.Canvas canvas)
{
base.OnDraw(canvas);
if (_bitmap == null || _bitmap.Width != canvas.Width || _bitmap.Height != canvas.Height)
{
if (_bitmap != null)
{
_bitmap.Dispose();
}
_bitmap = Bitmap.CreateBitmap(canvas.Width, canvas.Height, Bitmap.Config.Argb8888);
}
try
{
using (var surface = SKSurface.Create(canvas.Width, canvas.Height, SKColorType.Rgba8888 /*N_32*/, SKAlphaType.Premul, _bitmap.LockPixels(), canvas.Width * 4)) {
var skcanvas = surface.Canvas;
skcanvas.Scale(((float)canvas.Width) / (float)_tategumiView.Width, ((float)canvas.Height) / (float)_tategumiView.Height);
_tateView.SendDraw(skcanvas);
}
}
finally {
_bitmap.UnlockPixels();
}
canvas.DrawBitmap(_bitmap, 0, 0, null);
}
