protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
if (sample == null)
{
return;
}
var width = Width;
var height = Height;
using (var bitmap = new Bitmap(width, height, PixelFormat.Format32bppPArgb))
{
var data = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, bitmap.PixelFormat);
using (var surface = SKSurface.Create(width, height, SKImageInfo.PlatformColorType, SKAlphaType.Premul, data.Scan0, width * 4))
{
var skcanvas = surface.Canvas;
sample.Method(skcanvas, width, height);
}
bitmap.UnlockBits(data);
e.Graphics.DrawImage(bitmap, new Rectangle(0, 0, Width, Height));
}
}
protected override void OnRender(DrawingContext drawingContext)
{
base.OnRender(drawingContext);
if (sample == null)
{
return;
}
var m = PresentationSource.FromVisual(this).CompositionTarget.TransformToDevice;
var dpiX = m.M11;
var dpiY = m.M22;
int width = (int)(ActualWidth * dpiX);
int height = (int)(ActualHeight * dpiY);
var bitmap = new WriteableBitmap(width, height, 96, 96, PixelFormats.Pbgra32, null);
bitmap.Lock();
using (var surface = SKSurface.Create(width, height, SKImageInfo.PlatformColorType, SKAlphaType.Premul, bitmap.BackBuffer, bitmap.BackBufferStride))
{
var skcanvas = surface.Canvas;
skcanvas.Scale((float)dpiX, (float)dpiY);
using (new SKAutoCanvasRestore(skcanvas, true))
{
sample.Method(skcanvas, (int)ActualWidth, (int)ActualHeight);
}
}
bitmap.AddDirtyRect(new Int32Rect(0, 0, width, height));
bitmap.Unlock();
drawingContext.DrawImage(bitmap, new Rect(0, 0, ActualWidth, ActualHeight));
}
public override void DrawRect(CoreGraphics.CGRect dirtyRect)
{
base.DrawRect(dirtyRect);
if (grContext != null)
{
var sampleCount = grContext.GetRecommendedSampleCount(GRPixelConfig.Rgba8888, 96.0f);
var desc = new GRBackendRenderTargetDesc
{
Width = (int)Bounds.Width,
Height = (int)Bounds.Height,
Config = GRPixelConfig.Rgba8888,
Origin = GRSurfaceOrigin.TopLeft,
SampleCount = sampleCount,
StencilBits = 0,
RenderTargetHandle = IntPtr.Zero,
};
using (var surface = SKSurface.Create(grContext, desc))
{
var skcanvas = surface.Canvas;
sample.Method(skcanvas, (int)Bounds.Width, (int)Bounds.Height);
skcanvas.Flush();
}
GL.Flush();
}
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
if (grContext != null)
{
var desc = new GRBackendRenderTargetDesc
{
Width = Width,
Height = Height,
Config = GRPixelConfig.Bgra8888,
Origin = GRSurfaceOrigin.TopLeft,
SampleCount = 1,
StencilBits = 0,
RenderTargetHandle = IntPtr.Zero,
};
using (var surface = SKSurface.Create(grContext, desc))
{
var skcanvas = surface.Canvas;
sample.Method(skcanvas, Width, Height);
skcanvas.Flush();
}
SwapBuffers();
}
}
private void UpdateBitmap()
{
var resolutionScale = DisplayInformation.GetForCurrentView().ResolutionScale;
var screenScale = (float)resolutionScale / 100.0f;
var width = (int)(ActualWidth * screenScale);
var height = (int)(ActualHeight * screenScale);
if (width == 0 || height == 0)
{
return;
}
IntPtr buff = Marshal.AllocCoTaskMem(width * height * 4);
try
{
using (var surface = SKSurface.Create(width, height, SKImageInfo.PlatformColorType, SKAlphaType.Premul, buff, width * 4))
{
var skcanvas = surface.Canvas;
skcanvas.Scale(screenScale, screenScale);
sample?.Method(skcanvas, (int)ActualWidth, (int)ActualHeight);
}
var pixels = new byte[width * height * 4];
Marshal.Copy(buff, pixels, 0, pixels.Length);
var bitmap = new WriteableBitmap(width, height);
var stream = bitmap.PixelBuffer.AsStream();
stream.Seek(0, SeekOrigin.Begin);
stream.Write(pixels, 0, pixels.Length);
bitmap.Invalidate();
var b = bitmap;
Background = new ImageBrush
{
ImageSource = b,
AlignmentX = AlignmentX.Center,
AlignmentY = AlignmentY.Center,
Stretch = Stretch.Fill
};
}
finally
{
if (buff != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(buff);
}
}
}
