[imager.git] / immacros.h

/* 
   Imager "functions" implemented as macros 

   I suppose these could go in imdatatypes, but they aren't types.
*/
#ifndef IMAGER_IMMACROS_H_
#define IMAGER_IMMACROS_H_

/*
=item i_img_has_alpha(im)

=category Image Information

Return true if the image has an alpha channel.

=cut
*/

#define i_img_has_alpha(im) ((im)->channels == 2 || (im)->channels == 4)

/*
=item i_img_color_channels(im)

=category Image Information

The number of channels holding color information.

=cut
*/

#define i_img_color_channels(im) (i_img_has_alpha(im) ? (im)->channels - 1 : (im)->channels)

#endif
Commit	Line	Data
bea65b1f TC	1	/*
	2	Imager "functions" implemented as macros
	3
	4	I suppose these could go in imdatatypes, but they aren't types.
	5	*/
	6	#ifndef IMAGER_IMMACROS_H_
	7	#define IMAGER_IMMACROS_H_
	8
	9	/*
	10	=item i_img_has_alpha(im)
	11
	12	=category Image Information
	13
	14	Return true if the image has an alpha channel.
	15
	16	=cut
	17	*/
	18
	19	#define i_img_has_alpha(im) ((im)->channels == 2 \|\| (im)->channels == 4)
	20
	21	/*
	22	=item i_img_color_channels(im)
	23
	24	=category Image Information
	25
	26	The number of channels holding color information.
	27
	28	=cut
	29	*/
	30
	31	#define i_img_color_channels(im) (i_img_has_alpha(im) ? (im)->channels - 1 : (im)->channels)
	32
	33	#endif