将 System.drawing 转换为 SharpDX.direct 2D1

问题描述 投票：0回答：2

我正在开发一个图形应用程序，它可以根据用户设置在 CPU 或 GPU 上绘图。为了利用 CPU，我将 GDI+ 技术与 System.Drawing 组件结合使用。要在 GPU 上绘图，我想使用 SharpDX.Direct2D1 （因为我使用的是 c#）。

我创建了一个DrawingContext抽象类，它实现了Graphics类的每个绘图功能（接收System.Drawing.Brush、System.Drawing.Rectangle等...作为参数）并将它们重新实现到它的派生类（CPUDrawingContext）中。现在，我有一个 GPUDrawingContext 类，它必须重写所有这些方法，但由于参数来自 System.Drawing 类型，我需要将它们转换为 SharpDX 组件，速度非常快，所以我们看不到差异。

在这里查看一个小例子：我只放置了部分代码，以便您可以看到这个概念。

绘图上下文 

Public abstract class DrawingContext {
//System.drawing.Bitmap, System.Drawing.RectangleF
Public asbstract DrawImage(Bitmap b, RectangleF dest, RectangleF source,GraphicsUnit g);
//System.Drawing.Brush
Public abstract DrawRectangle(Brush b, Rectangle rect);


}

CPUDrawingContext：使用graphicContext作为图形在屏幕上渲染

Public  class CPUDrawingContext{
  //System.drawing.Bitmap, System.Drawing.RectangleF
  Public override DrawImage(Bitmap b, RectangleF dest, RectangleF source,GraphicsUnit g);
  //System.Drawing.Brush
  Public override DrawRectangle(Brush b, Rectangle rect){
      graphicContext.Rectangle(b,rect);
  }
  Public override DrawImage(Bitmap b, RectangleF dest, RectangleF source, GraphicsUnit g) {
      graphicContext.DrawImage(b,dest,source,g);
  }
}

GPUDrawingContext ：使用 renderTarger 作为 RenderTarget 在屏幕上渲染

Public class GPUDrawingContext {
   //System.drawing.Bitmap, System.Drawing.RectangleF
  Public override DrawImage(Bitmap b, RectangleF dest, RectangleF  source,GraphicsUnit g);
  //System.Drawing.Brush
  Public override DrawRectangle(Brush b, Rectangle rect){
      //convert b and rect to fit sharpDX component
      renderTarget.DrawRectangle(b,rect);
   }
  Public override DrawImage(Bitmap b, RectangleF dest, RectangleF source, GraphicsUnit g) {
      //(convert b,dest,source and g to fit sharpDX component)
      renderTarget.DrawImage(b,dest,source,g);
   }
 }

我已经在 GPUDrawingContext 中注释了我在绘制之前需要转换的区域。

我的问题是，是否可以做得非常快，这样我们就不会注意到（比如转换时间小于 10 毫秒）。

由于我的应用程序需要绘制位图，因此我需要非常快地将 System.Drawing.Bitmap 转换为 SharpDX.Direct2D1.Bitmap，但我注意到 SharpDX 位图似乎与 System.Drawing.Bitmap 并不真正兼容。

c# winforms sharpdx
2个回答
1
投票

这就是我将 System.Drawing.Bitmap 转换为 SharpDX.Direct2d1.Bitmap 的方法。 

Dim bmpData As BitmapData = m_Bitmap.LockBits(New System.Drawing.Rectangle(0, 0, m_Bitmap.Width, m_Bitmap.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, m_Bitmap.PixelFormat)

  Dim bgraArray As Byte() = New Byte(bmpData.Width * bmpData.Height * 4 - 1) {}

  Dim scan As IntPtr = bmpData.Scan0
  Marshal.Copy(scan, bgraArray, 0, (bmpData.Width * bmpData.Height) * 4)

  Dim rgbaarray As Byte() = New Byte(bmpData.Width * bmpData.Height * 4 - 1) {}

  Parallel.For(0, 4, Sub(range)
                        For i As Integer = range * bmpData.Height / 4 To bmpData.Height / 4 * (range + 1) - 1
                           Dim offset As Integer = i * bmpData.Width * 4
                           For j As Integer = 0 To bmpData.Width * 4 - 1 Step 4
                              rgbaarray(offset + j) = bgraArray(offset + j + 2)
                              rgbaarray(offset + j + 1) = bgraArray(offset + j + 1)
                              rgbaarray(offset + j + 2) = bgraArray(offset + j)
                              rgbaarray(offset + j + 3) = bgraArray(offset + j + 3)
                           Next
                        Next
                     End Sub)

  Dim stream As DataStream = New DataStream(bmpData.Height * bmpData.Width * 4, True, True)
  stream.WriteRange(rgbaarray)
  stream.Position = 0
  m_sharpDXbitmap = New SharpDX.Direct2D1.Bitmap(deviceContext, New Size2(m_Bitmap.Width, m_Bitmap.Height), stream, bmpData.Width * 4, bitmapProperties)
  m_Bitmap.UnlockBits(bmpData)

  stream.Dispose()

但是，这不是花费 10 毫秒，而是花费 120 毫秒。为了保持我想要的抽象，我所做的是创建一个包含两个位图的 CustomBitmap 类，并且在第一次绘制调用时，如果尚未转换，则仅将其转换一次，因此在以后的绘制调用中，这将会是即时的。这是我的 CustomBitmap 类：

Imports System.Drawing.Imaging
Imports System.Reflection
Imports SharpDX
Imports SharpDX.Direct2D1
Imports System.Runtime.InteropServices
Imports Synergx.Common.Drawing
Imports System.Collections.Concurrent
Imports System.Threading.Tasks

Public Class CustomBitmap

   Private bitmapProperties As BitmapProperties = New BitmapProperties(New SharpDX.Direct2D1.PixelFormat(SharpDX.DXGI.Format.R8G8B8A8_UNorm, SharpDX.Direct2D1.AlphaMode.Ignore))

   Public Property Bitmap As System.Drawing.Bitmap
      Get
         Return m_Bitmap
      End Get
      Set(value As System.Drawing.Bitmap)
         m_Bitmap = value
      End Set
   End Property

   Private m_Width As Integer
   Private m_Height As Integer
   Private m_Bitmap As System.Drawing.Bitmap
   Private m_sharpDXbitmap As SharpDX.Direct2D1.Bitmap = Nothing

   Public ReadOnly Property Width As Integer
      Get
         Return m_Width
      End Get
   End Property

   Public ReadOnly Property Height As Integer
      Get
         Return m_Height
      End Get
   End Property

   Public ReadOnly Property GPUBitmap As SharpDX.Direct2D1.Bitmap
      Get
         Return m_sharpDXbitmap
      End Get
   End Property

   Public Sub New(bitmap As System.Drawing.Bitmap)
      Me.Bitmap = bitmap
      m_Width = bitmap.Width
      m_Height = bitmap.Height
   End Sub

   Friend Sub GenerateSharpDXBitmap(deviceContext As SharpDX.Direct2D1.DeviceContext)

      If (m_Bitmap.PixelFormat = Imaging.PixelFormat.Format8bppIndexed) Then
         GenerateSharpDXBitmap8bpp(deviceContext)
      ElseIf (m_Bitmap.PixelFormat = Imaging.PixelFormat.Format32bppArgb) Then
         GenerateSharpDXBitmap32argp(deviceContext)
      End If

   End Sub

   Private Sub GenerateSharpDXBitmap8bpp(deviceContext As SharpDX.Direct2D1.DeviceContext)

      Dim bmpData As BitmapData = m_Bitmap.LockBits(New System.Drawing.Rectangle(0, 0, m_Bitmap.Width, m_Bitmap.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, m_Bitmap.PixelFormat)

      Dim integerArray As Integer()
      ReDim integerArray(bmpData.Height * bmpData.Width - 1)

      Parallel.For(0, 4, Sub(range)
                            Dim scan As IntPtr = bmpData.Scan0

                            For i As Integer = 0 To bmpData.Height * range / 4 - 1 - 1
                               scan += bmpData.Stride
                            Next

                            For y As Integer = bmpData.Height * range / 4 To bmpData.Height * (range + 1) / 4 - 1
                               Dim bytes As Byte() = New Byte(bmpData.Width - 1) {}
                               Marshal.Copy(scan, bytes, 0, bmpData.Width)

                               For x As Integer = 0 To bytes.Length - 1
                                  Dim B As Integer = bytes(x)
                                  Dim rgba As Integer = B Or (B << 8) Or (B << 16) Or (B << 24)
                                  integerArray(x + y * bmpData.Width) = rgba
                               Next
                               scan += bmpData.Stride

                            Next
                         End Sub)

      Dim stream As DataStream = New DataStream(bmpData.Height * bmpData.Width * 4, True, True)
      stream.WriteRange(integerArray)
      stream.Position = 0
      m_sharpDXbitmap = New SharpDX.Direct2D1.Bitmap(deviceContext, New Size2(m_Bitmap.Width, m_Bitmap.Height), stream, bmpData.Width * 4, bitmapProperties)
      m_Bitmap.UnlockBits(bmpData)

      stream.Dispose()

   End Sub

   Private Sub GenerateSharpDXBitmap32argp(deviceContext As SharpDX.Direct2D1.DeviceContext)
      Dim bmpData As BitmapData = m_Bitmap.LockBits(New System.Drawing.Rectangle(0, 0, m_Bitmap.Width, m_Bitmap.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, m_Bitmap.PixelFormat)

      Dim bgraArray As Byte() = New Byte(bmpData.Width * bmpData.Height * 4 - 1) {}

      Dim scan As IntPtr = bmpData.Scan0
      Marshal.Copy(scan, bgraArray, 0, (bmpData.Width * bmpData.Height) * 4)

      Dim rgbaarray As Byte() = New Byte(bmpData.Width * bmpData.Height * 4 - 1) {}

      Parallel.For(0, 4, Sub(range)
                            For i As Integer = range * bmpData.Height / 4 To bmpData.Height / 4 * (range + 1) - 1
                               Dim offset As Integer = i * bmpData.Width * 4
                               For j As Integer = 0 To bmpData.Width * 4 - 1 Step 4
                                  rgbaarray(offset + j) = bgraArray(offset + j + 2)
                                  rgbaarray(offset + j + 1) = bgraArray(offset + j + 1)
                                  rgbaarray(offset + j + 2) = bgraArray(offset + j)
                                  rgbaarray(offset + j + 3) = bgraArray(offset + j + 3)
                               Next
                            Next
                         End Sub)

      Dim stream As DataStream = New DataStream(bmpData.Height * bmpData.Width * 4, True, True)
      stream.WriteRange(rgbaarray)
      stream.Position = 0
      m_sharpDXbitmap = New SharpDX.Direct2D1.Bitmap(deviceContext, New Size2(m_Bitmap.Width, m_Bitmap.Height), stream, bmpData.Width * 4, bitmapProperties)
      m_Bitmap.UnlockBits(bmpData)

      stream.Dispose()
   End Sub

   Public Sub Dispose()
      If Bitmap IsNot Nothing Then
         m_Bitmap.Dispose()
         m_Bitmap = Nothing
      End If
      If m_sharpDXbitmap IsNot Nothing Then
         m_sharpDXbitmap.Dispose()
         m_sharpDXbitmap = Nothing
      End If
   End Sub

End Class

该类包含 2 种不同的方法，可以根据图像的原始 PixelFormat 分离为灰度颜色或 32bpp。

0
投票

对 user7970127 的代码进行一个小修正：

Parallel.For
中的内循环应该如下所示，否则颜色复制不正确。

For j As Integer = 0 To bmpData.Width * 4 - 1 Step 4
  rgbaarray(offset + j) = bgraArray(offset + j)
  rgbaarray(offset + j + 1) = bgraArray(offset + j + 1)
  rgbaarray(offset + j + 2) = bgraArray(offset + j + 2)
  rgbaarray(offset + j + 3) = bgraArray(offset + j + 3)
Next
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