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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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