SDL Wiki
(This function is part of SDL_image, a separate library from SDL.)

IMG_isPNM

Detect PNM image data on a readable/seekable SDL_RWops.

Syntax

int IMG_isPNM(SDL_RWops *src);

Function Parameters

src

a seekable/readable SDL_RWops to provide image data.

Return Value

Returns non-zero if this is PNM data, zero otherwise.

Remarks

This function attempts to determine if a file is a given filetype, reading the least amount possible from the SDL_RWops (usually a few bytes).

There is no distinction made between "not the filetype in question" and basic i/o errors.

This function will always attempt to seek the RWops back to where it started when this function was called, but it will not report any errors in doing so, but assuming seeking works, this means you can immediately use this with a different IMG_isTYPE function, or load the image without further seeking.

You do not need to call this function to load data; SDL_image can work to determine file type in many cases in its standard load functions.

Version

This function is available since SDL_image 2.0.0.

IMG_isAVIF
IMG_isICO
IMG_isCUR
IMG_isBMP
IMG_isGIF
IMG_isJPG
IMG_isJXL
IMG_isLBM
IMG_isPCX
IMG_isPNG
IMG_isSVG
IMG_isQOI
IMG_isTIF
IMG_isXCF
IMG_isXPM
IMG_isXV
IMG_isWEBP

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