how to use copypixels to get a pixel value in WIC ?

[Charltsing]

how to use copypixels to get a pixel value in WIC ?

https://learn.microsoft.com/en-us/windows/win32/api/wincodec/nf-wincodec-iwicbitmapsource-copypixels

Can you provide a sample code?

[smourier]

Getting a pixel depends on the pixel format of the WIC bitmap source.

There are various examples here for example https://github.com/smourier/WicNet/blob/main/WicNet.Tests/Program.cs#L59

[Charltsing]

Getting a pixel depends on the pixel format of the WIC bitmap source.

There are various examples here for example https://github.com/smourier/WicNet/blob/main/WicNet.Tests/Program.cs#L59

var bytes = bmp.CopyPixels(); --- it is slowly

HRESULT CopyPixels(
[in] const WICRect *prc,
[in] UINT cbStride,
[in] UINT cbBufferSize,
[out] BYTE *pbBuffer
);

how to set WICRect ?
i use it in mousemove event , so I need a quick method to read the pixel values of the specified coordinates

thanks for your help.

[smourier]

WicNet's CopyPixels has multiple overloads, for example

public void CopyPixels(int left, int top, int width, int height, uint bufferSize, IntPtr buffer, int? stride = null)

here
https://github.com/smourier/WicNet/blob/main/WicNet/WicBitmapSource.cs#L268

which maps to the native method with a rectangle

[Charltsing]

thanks a lot