iflGIF(3) Image Format Library C++ Reference Manual iflGIF(3)
NAME
iflGIF - GIF format image file
HEADER FILE
#include <ifl/iflGIF.h>
DESCRIPTION
This Image Format Library provides support to read/write image files
stored in Compuserve Graphics Image File (GIF) format.
The default extension for image files in the GIF format is '.gif'. When
you create a file with that extension IFL will assume you want the GIF
format, unless you override it with the iflFormat parameter.
In addition to all the standard iflFile methods, this format supprts an
number of format specific operations via the getItem() and setItem()
methods. The tag values supported by these methods are enumerated in the
following sections.
TAG VALUES FOR GET ITEM
The following tag values are supported with getItem():
iflGIFtransparentColor
iflStatus getItem(iflGIFtransparentColor,
int* red, int* green, int* blue)
If the GIF image being read has a transparent pixel i.e. it is intended
that a single index value be treated as a transparent pixel, then the
corresponding r,g,b values in the images colormap for that transparent
index is returned in red, green and blue. If there is no transparent
pixel then red, green and blue will be returned as -1.
iflGIFtransparentIndex
iflStatus getItem(iflGIFtransparentColor, int* index)
If the GIF image being read has a transparent pixel i.e. it is intended
that a single index value be treated as a transparent pixel, then the
value of that transparent index is returned in index. If there is no
transparent pixel then index will be returned as -1.
iflGIFinterlace
iflStatus getItem(iflGIFinterlace, int* interlaced)
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iflGIF(3) Image Format Library C++ Reference Manual iflGIF(3)
If the GIF image being read is interlaced then TRUE will be returned in
interlaced, otherwise FALSE will be returned.
iflGIFdelayTime
iflStatus getItem(iflGIFdelayTime, int* delayTime)
Returns the delay time for the current image in 1/100ths of a second or
zero if no delay is specified.
TAG VALUES FOR SET ITEM
The following tag values are supported with setItem():
iflGIFtransparentIndex
iflStatus setItem(iflGIFtransparentColor, int index)
Set the index value of the image's transparent pixel to index.
iflGIFinterlace
iflStatus setItem(iflGIFinterlace, int interlaced)
If interlaced = TRUE, then the GIF image produced will be interlaced;
otherwise not.
iflGIFdelayTime
iflStatus setItem(iflGIFdelayTime, int delayTime)
Sets the delay time for the current image in 1/100ths of a second.
SEE ALSO
iflFile, ilFileImg
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