public DrawingContext CreateDrawingContext()
{
var fb = _surface.Lock();
PixelFormatShim shim = null;
SKImageInfo framebuffer = new SKImageInfo(fb.Width, fb.Height, TranslatePixelFormat(fb.Format),
SKAlphaType.Opaque);
var surface = SKSurface.Create(framebuffer, fb.Address, fb.RowBytes) ??
(shim = new PixelFormatShim(framebuffer, fb.Address, fb.RowBytes))
.CreateSurface();
if (surface == null)
{
throw new Exception("Unable to create a surface for pixel format " + fb.Format +
" or pixel format translator");
}
var canvas = surface.Canvas;
canvas.RestoreToCount(0);
canvas.Save();
canvas.Clear(SKColors.Red);
canvas.ResetMatrix();
var scale = Matrix.CreateScale(fb.Dpi.Width / 96, fb.Dpi.Height / 96);
return(new DrawingContext(new DrawingContextImpl(canvas, scale, canvas, surface, shim, fb)));
}
public IDrawingContextImpl CreateDrawingContext(IVisualBrushRenderer visualBrushRenderer)
{
var fb = _surface.Lock();
PixelFormatShim shim = null;
SKImageInfo framebuffer = new SKImageInfo(fb.Width, fb.Height, fb.Format.ToSkColorType(),
SKAlphaType.Premul);
var surface = SKSurface.Create(framebuffer, fb.Address, fb.RowBytes) ??
(shim = new PixelFormatShim(framebuffer, fb.Address, fb.RowBytes))
.CreateSurface();
if (surface == null)
{
throw new Exception("Unable to create a surface for pixel format " + fb.Format +
" or pixel format translator");
}
var canvas = surface.Canvas;
canvas.RestoreToCount(0);
canvas.Save();
canvas.ResetMatrix();
var scale = Matrix.CreateScale(fb.Dpi.Width / 96, fb.Dpi.Height / 96);
return(new DrawingContextImpl(canvas, visualBrushRenderer, scale, canvas, surface, shim, fb));
}
