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MGL_getJPEGSizeExt

Obtain the dimensions of a JPEG file from an opened file.

Declaration

ibool MGLAPI MGL_getJPEGSizeExt(
    FILE *f,
    ulong dwOffset,
    ulong dwSize,
    int *width,
    int *height,
    int *bitsPerPixel,
    pixel_format_t *pf)

Prototype In

mgraph.h

Parameters

f

Open binary file to read bitmap from

dwOffset

Offset to start of JPEG file

dwSize

Size of JPEG file

width

Width of bitmap

height

Height of bitmap

bitsPerPixel

Pixel depth of bitmap

pf

Place to store the bitmap pixel format information

 

Return Value

True if JPEG was found, false if not.

Description

This function is the same as MGL_getJPEGSize, however it works with a previously opened file. This allows you to create your own large files with multiple files embedded in them.

Note that JPEG files are inherently 24-bit, so when you call this function it will always return information for a 24-bit RGB pixel format image.

See Also

MGL_getJPEGSize

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