mirror of
https://gitlab.winehq.org/wine/fontforge.git
synced 2025-10-14 02:47:57 +08:00
50 lines
2.3 KiB
C
50 lines
2.3 KiB
C
/* Copyright (C) 2000-2012 by George Williams */
|
|
/*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
|
|
* The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
|
|
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
|
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
#ifndef _COLORP_H
|
|
#define _COLORP_H
|
|
|
|
/* how to convert rgb to grey scale */
|
|
#define LRD 3
|
|
#define LGN 6
|
|
#define LBL 2 /* Should be 1 */
|
|
|
|
/* Convert an RGB value [0,255]*3 into a grey value [0,255] */
|
|
# if LRD+LGN+LBL!=11
|
|
# define RGB2GREY(r,g,b) ((LRD*(r)+LGN*(g)+LBL*(b))/(LRD+LGN+LBL))
|
|
# else
|
|
# define RGB2GREY(r,g,b) ( ( (LRD*(r)+LGN*(g)+LBL*(b)) *2979)>>15 )
|
|
# endif
|
|
|
|
#define COLOR2GREY(col) (RGB2GREY(COLOR_RED(col),COLOR_GREEN(col),COLOR_BLUE(col)))
|
|
/* convert an RGB value into a grey fraction [0.0,1.0] */
|
|
#define COLOR2GREYR(col) ((LRD*COLOR_RED(col)+LGN*COLOR_GREEN(col)+LBL*COLOR_BLUE(col))/((LRD+LGN+LBL)*255.0))
|
|
|
|
/* for a mono screen, should a color be white, or black? */
|
|
#define COLOR2WHITE(col) (COLOR_RED(col)*LRD+COLOR_GREEN(col)*LGN+COLOR_BLUE(col)*LBL>=(LRD+LGN+LBL)*128)
|
|
#define COLOR2BLACK(col) (COLOR_RED(col)*LRD+COLOR_GREEN(col)*LGN+COLOR_BLUE(col)*LBL< (LRD+LGN+LBL)*128)
|
|
#endif
|