GrayPixmap.c revision 6c321187 
1/* $Xorg: GrayPixmap.c,v 1.4 2001/02/09 02:03:52 xorgcvs Exp $ */
2
3/*
4
5Copyright 1987, 1988, 1998  The Open Group
6
7Permission to use, copy, modify, distribute, and sell this software and its
8documentation for any purpose is hereby granted without fee, provided that
9the above copyright notice appear in all copies and that both that
10copyright notice and this permission notice appear in supporting
11documentation.
12
13The above copyright notice and this permission notice shall be included in
14all copies or substantial portions of the Software.
15
16THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
19OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
20AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22
23Except as contained in this notice, the name of The Open Group shall not be
24used in advertising or otherwise to promote the sale, use or other dealings
25in this Software without prior written authorization from The Open Group.
26
27*/
28
29/***********************************************************
30
31Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.
32
33                        All Rights Reserved
34
35Permission to use, copy, modify, and distribute this software and its
36documentation for any purpose and without fee is hereby granted,
37provided that the above copyright notice appear in all copies and that
38both that copyright notice and this permission notice appear in
39supporting documentation, and that the name of Digital not be
40used in advertising or publicity pertaining to distribution of the
41software without specific, written prior permission.
42
43DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
44ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
45DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
46ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
47WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
48ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
49SOFTWARE.
50
51******************************************************************/
52/* $XFree86: xc/lib/Xmu/GrayPixmap.c,v 1.5 2001/01/17 19:42:55 dawes Exp $ */
53
54#ifdef HAVE_CONFIG_H
55#include <config.h>
56#endif
57#include <stdio.h>
58#include <X11/Intrinsic.h>
59#include <X11/Xmu/Drawing.h>
60
61typedef struct _PixmapCache {
62    Screen *screen;
63    Pixmap pixmap;
64    Pixel foreground, background;
65    unsigned int depth;
66    int ref_count;
67    struct _PixmapCache *next;
68  } CacheEntry;
69
70static CacheEntry *pixmapCache = NULL;
71
72
73
74Pixmap
75XmuCreateStippledPixmap(Screen *screen, Pixel fore, Pixel back,
76			unsigned int depth)
77/*
78 *	Creates a stippled pixmap of specified depth
79 *	caches these so that multiple requests share the pixmap
80 */
81{
82    register Display *display = DisplayOfScreen(screen);
83    CacheEntry *cachePtr;
84    Pixmap stippled_pixmap;
85    static unsigned char pixmap_bits[] = {
86	0x02, 0x01,
87    };
88
89/*
90 *	Creates a stippled pixmap of depth DefaultDepth(screen)
91 *	caches these so that multiple requests share the pixmap
92 */
93
94#define pixmap_width 2
95#define pixmap_height 2
96
97    /* see if we already have a pixmap suitable for this screen */
98    for (cachePtr = pixmapCache; cachePtr; cachePtr = cachePtr->next) {
99	if (cachePtr->screen == screen && cachePtr->foreground == fore &&
100	    cachePtr->background == back && cachePtr->depth == depth)
101	    return( cachePtr->ref_count++, cachePtr->pixmap );
102    }
103
104    stippled_pixmap = XCreatePixmapFromBitmapData (display,
105			RootWindowOfScreen(screen), (char *)pixmap_bits,
106			pixmap_width, pixmap_height, fore, back, depth);
107
108    /* and insert it at the head of the cache */
109    cachePtr = XtNew(CacheEntry);
110    cachePtr->screen = screen;
111    cachePtr->foreground = fore;
112    cachePtr->background = back;
113    cachePtr->depth = depth;
114    cachePtr->pixmap = stippled_pixmap;
115    cachePtr->ref_count = 1;
116    cachePtr->next = pixmapCache;
117    pixmapCache = cachePtr;
118
119    return( stippled_pixmap );
120}
121
122void
123XmuReleaseStippledPixmap(Screen *screen, Pixmap pixmap)
124{
125    register Display *display = DisplayOfScreen(screen);
126    CacheEntry *cachePtr, **prevP;
127    for (prevP = &pixmapCache, cachePtr = pixmapCache; cachePtr;) {
128	if (cachePtr->screen == screen && cachePtr->pixmap == pixmap) {
129	    if (--cachePtr->ref_count == 0) {
130		XFreePixmap( display, pixmap );
131		*prevP = cachePtr->next;
132		XtFree( (char*)cachePtr );
133		break;
134	    }
135	}
136	prevP = &cachePtr->next;
137	cachePtr = *prevP;
138    }
139}
140