IWICBitmapSource::GetResolution method (wincodec.h)
Retrieves the sampling rate between pixels and physical world measurements.
HRESULT GetResolution( double *pDpiX, double *pDpiY );
A pointer that receives the x-axis dpi resolution.
A pointer that receives the y-axis dpi resolution.
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
Some formats, such as GIF and ICO, do not have full DPI support. For GIF, this method calculates the DPI values from the aspect ratio, using a base DPI of (96.0, 96.0). The ICO format does not support DPI at all, and the method always returns (96.0,96.0) for ICO images.
Additionally, WIC itself does not transform images based on the DPI values in an image. It is up to the caller to transform an image based on the resolution returned.
|Minimum supported client||Windows XP with SP2, Windows Vista [desktop apps | UWP apps]|
|Minimum supported server||Windows Server 2008 [desktop apps | UWP apps]|