从非托管缓冲区创建图像
我需要在C＃编写的WPF应用程序中显示图像。图像内容由外部非托管库生成，该库将光栅缓冲区本身分配。
我正在尝试将该缓冲区包裹在bitmapsource对象（用image> Image> Control的source Control）使用创建方法，但是该方法采用一个字节数组，而我所拥有的只是intptr到缓冲区。
有没有办法从非托管缓冲区创建字节数组？最好不复制？ （我知道我正在做的事情不安全，但是缓冲区可以在应用程序的整个生命周期内持续存在）。
还是有另一种方法可以将栅格图像从未托管的缓冲区显示到image或canvas对象或类似方法中？
更新：
我只是错过了bitmapsource.create的过载，它采用intptr！ （尽管我不知道这是否会复制图像。）
I need to display an image in a WPF application written in C#. The image content is generated by an external unmanaged library, which allocates the raster buffer itself.
I am trying to wrap that buffer in a BitmapSource object (attached as the Source of an Image control) using the Create method, but the method takes a byte array whereas all I have is an IntPtr to the buffer.
Is there a way to create a byte array from an unmanaged buffer ? Preferably without copying ? (I know that what I am doing is unsafe, but the buffer is guaranteed to persist for the whole lifetime of the application).
Or is there an alternative way to display a raster image from an unmanaged buffer into an Image or Canvas object or similar ?
Update:
I just missed that there is an overload of BitmapSource.Create that takes an IntPtr ! (Though I don't know if that copies the image or not.)
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（2）
为了从非管理的RAW PIXEL缓冲区创建BitMapsource，请使用 bitmapsource.create.create 方法，例如这样：
如果您想周期性地更新图像元素的来源，可能更有效地覆盖单个可文字标记的缓冲区，而不是在每个周期中使用新的BitMapsource重新分配图像的源。
In order to create a BitmapSource from an unmanaged raw pixel buffer, use the BitmapSource.Create method, e.g. like this:
In case you want to cyclically update the Source of an Image element, it may may be more efficient to overwrite the buffer of a single WriteableBitmap instead of reassigning the Image's Source with a new BitmapSource in each cycle.
我建议使用 WritableBitMap 。尽管这确实需要副本，但它不需要任何分配，我希望性能在实时视图的要求之内。
I would suggest using a WriteableBitmap. While this do require a copy, it should not need any allocations, and I would expect the performance to be well within the requirements for a live view.