上一篇告诉大家如何在 WPF 使用 SharpDx ，看起来代码比较复杂，所以本文告诉大家如何使用我封装的控件。
本文是一个系列，希望大家从第一篇开始看
- WPF 使用 Direct2D1 画图入门
- WPF 使用 Direct2D1 画图 绘制基本图形
- WPF 使用 SharpDX
- WPF 使用 SharpDX 在 D3DImage 显示
- WPF 使用封装的 SharpDx 控件
在WPF 使用 SharpDX 在 D3DImage 显示我告诉大家如何在 WPF 使用，但是代码都是写在一个 MainPage ，所以下面我把代码封装一下，放在一个类。
我的代码可以复制一下放在自己的工程使用，现在我还不想做 Nuget 因为这个类还有性能问题。
使用这个类作为 Image 的 Source 会占用 3% 的 CPU ，而且这个类没有注释，关于这个类是如何写的请看WPF 使用 SharpDX 在 D3DImage 显示 。
我会把这个类的代码放在文章最后，方便大家复制。
下面来告诉大家如何使用这个类。
首先复制代码，放在一个文件
写一个类继承 SharpDxImage ，这里我随意写一个类叫 SsgnnnaTkmlo ，这个类可以重写 OnRender ，也就是在绘制需要显示什么。
代码语言：javascript复制 public class SsgnnnaTkmlo : SharpDxImage
{
/// <inheritdoc />
protected override void OnRender(RenderTarget renderTarget)
{
//随便画一个矩形。下面的代码就是清空屏幕，参数 null 为透明，可以给其他的颜色。如何绘制请看文章。
renderTarget.Clear(null);
var brush = new SharpDX.Direct2D1.SolidColorBrush(renderTarget, new RawColor4(1, 0, 0, 1));
var kvudjuzjsHlqiv = ran.Next((int) 100 - 10);
var dfulTokpj = ran.Next((int) 100 - 10);
renderTarget.DrawRectangle(
new RawRectangleF(kvudjuzjsHlqiv, dfulTokpj, kvudjuzjsHlqiv 10, dfulTokpj 10), brush, 1);
}
private Random ran = new Random();
}需要告诉大家的是，传入 RenderTarget 的绘制和之前其他代码的绘制是一样，关于 SharpDx 的绘制我会在另一篇博客告诉大家。
然后打开 xaml 写入下面代码
代码语言：javascript复制 <Image x:Name="DcwtTmmwvcr">
<Image.Source>
<local:SsgnnnaTkmlo x:Name="DrmKroh"></local:SsgnnnaTkmlo>
</Image.Source>
</Image>当然，因为只是简单的例子，大家也可以写在后台代码。
在 xaml.cs 写下面代码，在 Load 绑定
代码语言：javascript复制 DcwtTmmwvcr.Loaded = (s, e) =>
{
DrmKroh.CreateAndBindTargets((int) ActualWidth, (int) ActualHeight);
};注意需要使用图片控件的 Load 事件，不然拿到的图片会模糊。
现在可以尝试运行一下，就可以看到一个随机出现的矩形。
下面就是封装类的代码。
代码语言：javascript复制using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Media;
using SharpDX.Direct3D;
namespace WPFSharpDx
{
public abstract class SharpDxImage : D3DImage
{
public void CreateAndBindTargets(int actualWidth, int actualHeight)
{
var width = Math.Max(actualWidth, 100);
var height = Math.Max(actualHeight, 100);
var renderDesc = new SharpDX.Direct3D11.Texture2DDescription
{
BindFlags = SharpDX.Direct3D11.BindFlags.RenderTarget | SharpDX.Direct3D11.BindFlags.ShaderResource,
Format = SharpDX.DXGI.Format.B8G8R8A8_UNorm,
Width = width,
Height = height,
MipLevels = 1,
SampleDescription = new SharpDX.DXGI.SampleDescription(1, 0),
Usage = SharpDX.Direct3D11.ResourceUsage.Default,
OptionFlags = SharpDX.Direct3D11.ResourceOptionFlags.Shared,
CpuAccessFlags = SharpDX.Direct3D11.CpuAccessFlags.None,
ArraySize = 1
};
var device = new SharpDX.Direct3D11.Device(DriverType.Hardware,
SharpDX.Direct3D11.DeviceCreationFlags.BgraSupport);
var renderTarget = new SharpDX.Direct3D11.Texture2D(device, renderDesc);
var surface = renderTarget.QueryInterface<SharpDX.DXGI.Surface>();
var d2DFactory = new SharpDX.Direct2D1.Factory();
var renderTargetProperties =
new SharpDX.Direct2D1.RenderTargetProperties(
new SharpDX.Direct2D1.PixelFormat(SharpDX.DXGI.Format.Unknown,
SharpDX.Direct2D1.AlphaMode.Premultiplied));
_d2DRenderTarget = new SharpDX.Direct2D1.RenderTarget(d2DFactory, surface, renderTargetProperties);
SetRenderTarget(renderTarget);
device.ImmediateContext.Rasterizer.SetViewport(0, 0, width, height);
CompositionTarget.Rendering = CompositionTarget_Rendering;
}
protected abstract void OnRender(SharpDX.Direct2D1.RenderTarget renderTarget);
private SharpDX.Direct3D9.Texture _renderTarget;
private SharpDX.Direct2D1.RenderTarget _d2DRenderTarget;
private void CompositionTarget_Rendering(object sender, EventArgs e)
{
Rendering();
}
private void Rendering()
{
_d2DRenderTarget.BeginDraw();
OnRender(_d2DRenderTarget);
_d2DRenderTarget.EndDraw();
Lock();
AddDirtyRect(new Int32Rect(0, 0, PixelWidth, PixelHeight));
Unlock();
}
private void SetRenderTarget(SharpDX.Direct3D11.Texture2D target)
{
var format = TranslateFormat(target);
var handle = GetSharedHandle(target);
var presentParams = GetPresentParameters();
var createFlags = SharpDX.Direct3D9.CreateFlags.HardwareVertexProcessing |
SharpDX.Direct3D9.CreateFlags.Multithreaded |
SharpDX.Direct3D9.CreateFlags.FpuPreserve;
var d3DContext = new SharpDX.Direct3D9.Direct3DEx();
var d3DDevice = new SharpDX.Direct3D9.DeviceEx(d3DContext, 0, SharpDX.Direct3D9.DeviceType.Hardware,
IntPtr.Zero, createFlags,
presentParams);
_renderTarget = new SharpDX.Direct3D9.Texture(d3DDevice, target.Description.Width,
target.Description.Height, 1,
SharpDX.Direct3D9.Usage.RenderTarget, format, SharpDX.Direct3D9.Pool.Default, ref handle);
using (var surface = _renderTarget.GetSurfaceLevel(0))
{
Lock();
SetBackBuffer(D3DResourceType.IDirect3DSurface9, surface.NativePointer);
Unlock();
}
}
private static SharpDX.Direct3D9.PresentParameters GetPresentParameters()
{
var presentParams = new SharpDX.Direct3D9.PresentParameters();
presentParams.Windowed = true;
presentParams.SwapEffect = SharpDX.Direct3D9.SwapEffect.Discard;
presentParams.DeviceWindowHandle = NativeMethods.GetDesktopWindow();
presentParams.PresentationInterval = SharpDX.Direct3D9.PresentInterval.Default;
return presentParams;
}
private IntPtr GetSharedHandle(SharpDX.Direct3D11.Texture2D texture)
{
using (var resource = texture.QueryInterface<SharpDX.DXGI.Resource>())
{
return resource.SharedHandle;
}
}
private static SharpDX.Direct3D9.Format TranslateFormat(SharpDX.Direct3D11.Texture2D texture)
{
switch (texture.Description.Format)
{
case SharpDX.DXGI.Format.R10G10B10A2_UNorm:
return SharpDX.Direct3D9.Format.A2B10G10R10;
case SharpDX.DXGI.Format.R16G16B16A16_Float:
return SharpDX.Direct3D9.Format.A16B16G16R16F;
case SharpDX.DXGI.Format.B8G8R8A8_UNorm:
return SharpDX.Direct3D9.Format.A8R8G8B8;
default:
return SharpDX.Direct3D9.Format.Unknown;
}
}
private static class NativeMethods
{
[DllImport("user32.dll", SetLastError = false)]
public static extern IntPtr GetDesktopWindow();
}
}
}
