public IDrawingContextImpl CreateDrawingContext(IVisualBrushRenderer visualBrushRenderer)
{
var session = _surface.BeginDraw();
bool success = false;
try
{
var disp = session.Display;
var gl = disp.GlInterface;
gl.GetIntegerv(GL_FRAMEBUFFER_BINDING, out var fb);
var size = session.Size;
var scaling = session.Scaling;
if (size.Width <= 0 || size.Height <= 0 || scaling < 0)
{
session.Dispose();
throw new InvalidOperationException(
$"Can't create drawing context for surface with {size} size and {scaling} scaling");
}
gl.Viewport(0, 0, size.Width, size.Height);
gl.ClearStencil(0);
gl.ClearColor(0, 0, 0, 0);
gl.Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
lock (_grContext)
{
_grContext.ResetContext();
GRBackendRenderTarget renderTarget =
new GRBackendRenderTarget(size.Width, size.Height, disp.SampleCount, disp.StencilSize,
new GRGlFramebufferInfo((uint)fb, GRPixelConfig.Rgba8888.ToGlSizedFormat()));
var surface = SKSurface.Create(_grContext, renderTarget,
session.IsYFlipped ? GRSurfaceOrigin.TopLeft : GRSurfaceOrigin.BottomLeft,
GRPixelConfig.Rgba8888.ToColorType());
var nfo = new DrawingContextImpl.CreateInfo
{
GrContext = _grContext,
Canvas = surface.Canvas,
Dpi = SkiaPlatform.DefaultDpi * scaling,
VisualBrushRenderer = visualBrushRenderer,
DisableTextLcdRendering = true
};
var ctx = new DrawingContextImpl(nfo, Disposable.Create(() =>
{
surface.Canvas.Flush();
surface.Dispose();
renderTarget.Dispose();
_grContext.Flush();
session.Dispose();
}));
success = true;
return(ctx);
}
}
finally
{
if (!success)
{
session.Dispose();
}
}
}
