protected override bool OnExposeEvent(Gdk.EventExpose evnt)
{
var window = evnt.Window;
// get the pixbuf
var imgInfo = CreateDrawingObjects();
if (imgInfo.Width == 0 || imgInfo.Height == 0)
{
return(true);
}
// start drawing
using (new SKAutoCanvasRestore(surface.Canvas, true))
{
OnPaintSurface(new SKPaintSurfaceEventArgs(surface, imgInfo));
}
surface.Canvas.Flush();
// swap R and B
if (imgInfo.ColorType == SKColorType.Bgra8888)
{
using (var pixmap = surface.PeekPixels())
{
SKSwizzle.SwapRedBlue(pixmap.GetPixels(), imgInfo.Width * imgInfo.Height);
}
}
// write the pixbuf to the graphics
window.Clear();
window.DrawPixbuf(null, pix, 0, 0, 0, 0, imgInfo.Width, imgInfo.Height, Gdk.RgbDither.None, 0, 0);
return(true);
}
protected override bool OnDrawn(Context cr)
{
// get the pixbuf
var imgInfo = CreateDrawingObjects();
if (imgInfo.Width == 0 || imgInfo.Height == 0)
{
return(true);
}
// start drawing
using (new SKAutoCanvasRestore(surface.Canvas, true))
{
OnPaintSurface(new SKPaintSurfaceEventArgs(surface, imgInfo));
}
surface.Canvas.Flush();
pix.MarkDirty();
// swap R and B
if (imgInfo.ColorType == SKColorType.Rgba8888)
{
using (var pixmap = surface.PeekPixels())
{
SKSwizzle.SwapRedBlue(pixmap.GetPixels(), imgInfo.Width * imgInfo.Height);
}
}
// write the pixbuf to the graphics
cr.SetSourceSurface(pix, 0, 0);
cr.Paint();
return(true);
}
private SKPixmap DrawMarker(SKPin sharedMarker)
{
double bitmapWidth = sharedMarker.Width * Context.Resources.DisplayMetrics.Density;
double bitmapHeight = sharedMarker.Height * Context.Resources.DisplayMetrics.Density;
SKSurface surface = SKSurface.Create((int)bitmapWidth, (int)bitmapHeight, SKColorType.Rgba8888, SKAlphaType.Premul);
surface.Canvas.Clear(SKColor.Empty);
sharedMarker.DrawPin(surface);
return(surface.PeekPixels());
}
private Task <UIImage> RenderPinAsync(SKPin pin, CancellationToken token = default(CancellationToken))
{
return(Task.Run(() =>
{
double bitmapWidth = pin.Width * _screenDensity;
double bitmapHeight = pin.Height * _screenDensity;
using (SKSurface surface = SKSurface.Create((int)bitmapWidth, (int)bitmapHeight, SKColorType.Rgba8888, SKAlphaType.Premul))
{
surface.Canvas.Clear(SKColor.Empty);
pin.DrawPin(surface);
return surface.PeekPixels().ToUIImage();
}
}, token));
}
