/// <summary>
/// Initializes a new instance of the <see cref="DrawingContextImpl"/> class.
/// </summary>
/// <param name="visualBrushRenderer">The visual brush renderer.</param>
/// <param name="renderTarget">The render target to draw to.</param>
/// <param name="layerFactory">
/// An object to use to create layers. May be null, in which case a
/// <see cref="WicRenderTargetBitmapImpl"/> will created when a new layer is requested.
/// </param>
/// <param name="swapChain">An optional swap chain associated with this drawing context.</param>
/// <param name="finishedCallback">An optional delegate to be called when context is disposed.</param>
public DrawingContextImpl(
IVisualBrushRenderer visualBrushRenderer,
ILayerFactory layerFactory,
SharpDX.Direct2D1.RenderTarget renderTarget,
SharpDX.DXGI.SwapChain1 swapChain = null,
Action finishedCallback = null)
{
_visualBrushRenderer = visualBrushRenderer;
_layerFactory = layerFactory;
_renderTarget = renderTarget;
_swapChain = swapChain;
_finishedCallback = finishedCallback;
if (_renderTarget is DeviceContext deviceContext)
{
_deviceContext = deviceContext;
_ownsDeviceContext = false;
}
else
{
_deviceContext = _renderTarget.QueryInterface <DeviceContext>();
_ownsDeviceContext = true;
}
_deviceContext.BeginDraw();
}
/// <summary>
/// Sets the render target, releasing resources tied to previous render target if necessary</summary>
/// <param name="renderTarget">RenderTarget to set</param>
protected void SetRenderTarget(RenderTarget renderTarget)
{
if (renderTarget == null)
throw new ArgumentNullException("renderTarget");
m_clipStack.Clear();
ReleaseResources(true);
m_renderTargetNumber++;
m_renderTarget = renderTarget;
m_gdiInterop = m_renderTarget.QueryInterface<GdiInteropRenderTarget>();
Transform = Matrix3x2F.Identity;
if (s_strokeStyle == null)
{
var props = new D2dStrokeStyleProperties { EndCap = D2dCapStyle.Round, StartCap = D2dCapStyle.Round };
s_strokeStyle = D2dFactory.CreateD2dStrokeStyle(props);
}
m_solidColorBrush = CreateSolidBrush(Color.Empty);
}
private void Resize(Size size)
{
Utilities.Dispose(ref _deviceContext);
Utilities.Dispose(ref _backBuffer);
Utilities.Dispose(ref _renderView);
Utilities.Dispose(ref _depthBuffer);
Utilities.Dispose(ref _depthView);
var context = Direct2D1Platform.Direct3D11Device.ImmediateContext;
// Resize the backbuffer
_swapChain.ResizeBuffers(0, 0, 0, Format.Unknown, SwapChainFlags.None);
// Get the backbuffer from the swapchain
_backBuffer = Resource.FromSwapChain <Texture2D>(_swapChain, 0);
// Renderview on the backbuffer
_renderView = new RenderTargetView(Direct2D1Platform.Direct3D11Device, _backBuffer);
// Create the depth buffer
_depthBuffer = new Texture2D(
Direct2D1Platform.Direct3D11Device,
new Texture2DDescription()
{
Format = Format.D32_Float_S8X24_UInt,
ArraySize = 1,
MipLevels = 1,
Width = (int)size.Width,
Height = (int)size.Height,
SampleDescription = new SampleDescription(1, 0),
Usage = ResourceUsage.Default,
BindFlags = BindFlags.DepthStencil,
CpuAccessFlags = CpuAccessFlags.None,
OptionFlags = ResourceOptionFlags.None
});
// Create the depth buffer view
_depthView = new DepthStencilView(Direct2D1Platform.Direct3D11Device, _depthBuffer);
// Setup targets and viewport for rendering
context.Rasterizer.SetViewport(new Viewport(0, 0, (int)size.Width, (int)size.Height, 0.0f, 1.0f));
context.OutputMerger.SetTargets(_depthView, _renderView);
// Setup new projection matrix with correct aspect ratio
_proj = Matrix.PerspectiveFovLH((float)Math.PI / 4.0f, (float)(size.Width / size.Height), 0.1f, 100.0f);
using (var dxgiBackBuffer = _swapChain.GetBackBuffer <Surface>(0))
{
var renderTarget = new SharpDX.Direct2D1.RenderTarget(
Direct2D1Platform.Direct2D1Factory,
dxgiBackBuffer,
new RenderTargetProperties
{
DpiX = 96,
DpiY = 96,
Type = RenderTargetType.Default,
PixelFormat = new PixelFormat(
Format.Unknown,
AlphaMode.Premultiplied)
});
_deviceContext = renderTarget.QueryInterface <DeviceContext>();
renderTarget.Dispose();
}
}