从一个Win32图标指示创建的Direct2D的BitmapSource

问题描述

我创建了C＃处理使用user32.dll中像这样的窗口得到的图标图像的应用程序：

I created an application in C# that gets icon images from window handles using user32.dll like this:

[DllImport("user32.dll", EntryPoint = "GetClassLong")]
private static extern int GetClassLongPtr32(IntPtr hWnd, int nIndex);

public static IntPtr GetAppIcon(IntPtr hwnd)
{
    return WI.GetClassLongPtr32(hwnd, WI.ICON_SMALL);
}

和我想创建该图标指针的BitmapSource。通常对于WPF我会用

And I want to create a BitmapSource from this icon pointer. Usually for WPF I would use

Imaging.CreateBitmapSourceFromHIcon(handle, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());

但因为我需要的BitmapSource绘制在一个的Direct2D渲染目标，我需要使用DirectX的的BitmapSource

But since I need the BitmapSource to draw it in a Direct2D render target I would need to use DirectX's BitmapSource

Microsoft.WindowsAPICodePack.DirectX.WindowImagingComponent.BitmapSource

我怎样才能创造这样的BitmapSource的使用图标手柄或者我可以传送一个的BitmapSource类型其他？

How can I create this kind of BitmapSource using the icon handle or can I transfer one BitmapSource type to the other?

推荐答案

在 ID2D1DeviceContext 有一个方法 CreateBitmapFromWicBitmap 。

有了它的帮助，你可以创建一个 ID2D1Bitmap 。你所要做的唯一事情就是创建一个 IWICBitmap 从惠康，然后创建一个 IWICFormatConverter ，这样可以保持alpha通道。你可以这样来做（从下面的代码片段是一个Delphi之一，但在C＃中应该是非常相似的的）：

With its help you can create an ID2D1Bitmap. The only thing you have to do is to create an IWICBitmap from your HICON and then create an IWICFormatConverter, so you can keep the alpha channel. You can do it this way (The snippet from below is a delphi one but in C# should be very similar):

procedure iconToD2D1Bitmap;
var
  hIcon: HICON;
  wicBitmap: IWICBitmap;
  wicConverter: IWICFormatConverter;
  wicFactory: IWICImagingFactory;
  bitmapProps: D2D1_BITMAP_PROPERTIES1;
  bitmap: ID2D1Bitmap1;
begin
  // get a HICON
  hIcon := SendMessage(Handle, WM_GETICON, ICON_BIG, 0);
  try
    // create wic imaging factory
    CoCreateInstance(CLSID_WICImagingFactory, nil, CLSCTX_INPROC_SERVER or CLSCTX_LOCAL_SERVER, IUnknown, wicFactory);

    wicFactory.CreateBitmapFromHICON(hIcon, wicBitmap);
    wicFactory.CreateFormatConverter(wicConverter);

    wicConverter.Initialize(wicBitmap, GUID_WICPixelFormat32bppPBGRA, WICBitmapDitherTypeNone, nil, 0, WICBitmapPaletteTypeMedianCut);

    bitmapProps.bitmapOptions := D2D1_BITMAP_OPTIONS_NONE;
    bitmapProps.pixelFormat.format := DXGI_FORMAT_B8G8R8A8_UNORM;
    bitmapProps.pixelFormat.alphaMode := D2D1_ALPHA_MODE_PREMULTIPLIED;
    bitmapProps.dpiX := 96;
    bitmapProps.dpiY := 96;
    bitmapProps.colorContext := nil;

    // deviceContext should be a valid D2D1DeviceContext
    deviceContext.CreateBitmapFromWicBitmap(wicConverter, @bitmapProps, bitmap);

    // the bitmap variable contains your icon

  except
    //
  end;
end;

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