IWICBitmapSource::GetResolution method (wincodec.h)

Článek
02/22/2024

Retrieves the sampling rate between pixels and physical world measurements.

Syntax

HRESULT GetResolution(
  [out] double *pDpiX,
  [out] double *pDpiY
);

Parameters

[out] pDpiX

Type: double*

A pointer that receives the x-axis dpi resolution.

[out] pDpiY

Type: double*

A pointer that receives the y-axis dpi resolution.

Return value

Type: HRESULT

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

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.

Requirements

Requirement	Value
Minimum supported client	Windows XP with SP2, Windows Vista [desktop apps \| UWP apps]
Minimum supported server	Windows Server 2008 [desktop apps \| UWP apps]
Target Platform	Windows
Header	wincodec.h
Library	Windowscodecs.lib
DLL	Windowscodecs.dll

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