GrayPixmap.c revision 0cc2eac3 
1/*
2
3Copyright 1987, 1988, 1998  The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
17OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21Except as contained in this notice, the name of The Open Group shall not be
22used in advertising or otherwise to promote the sale, use or other dealings
23in this Software without prior written authorization from The Open Group.
24
25*/
26
27/***********************************************************
28
29Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.
30
31                        All Rights Reserved
32
33Permission to use, copy, modify, and distribute this software and its
34documentation for any purpose and without fee is hereby granted,
35provided that the above copyright notice appear in all copies and that
36both that copyright notice and this permission notice appear in
37supporting documentation, and that the name of Digital not be
38used in advertising or publicity pertaining to distribution of the
39software without specific, written prior permission.
40
41DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
42ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
43DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
44ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
45WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
46ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
47SOFTWARE.
48
49******************************************************************/
50
51#ifdef HAVE_CONFIG_H
52#include <config.h>
53#endif
54#include <stdio.h>
55#include <X11/Intrinsic.h>
56#include <X11/Xmu/Drawing.h>
57
58typedef struct _PixmapCache {
59    Screen *screen;
60    Pixmap pixmap;
61    Pixel foreground, background;
62    unsigned int depth;
63    int ref_count;
64    struct _PixmapCache *next;
65  } CacheEntry;
66
67static CacheEntry *pixmapCache = NULL;
68
69
70
71Pixmap
72XmuCreateStippledPixmap(Screen *screen, Pixel fore, Pixel back,
73			unsigned int depth)
74/*
75 *	Creates a stippled pixmap of specified depth
76 *	caches these so that multiple requests share the pixmap
77 */
78{
79    register Display *display = DisplayOfScreen(screen);
80    CacheEntry *cachePtr;
81    Pixmap stippled_pixmap;
82    static unsigned char pixmap_bits[] = {
83	0x02, 0x01,
84    };
85
86/*
87 *	Creates a stippled pixmap of depth DefaultDepth(screen)
88 *	caches these so that multiple requests share the pixmap
89 */
90
91#define pixmap_width 2
92#define pixmap_height 2
93
94    /* see if we already have a pixmap suitable for this screen */
95    for (cachePtr = pixmapCache; cachePtr; cachePtr = cachePtr->next) {
96	if (cachePtr->screen == screen && cachePtr->foreground == fore &&
97	    cachePtr->background == back && cachePtr->depth == depth)
98	    return( cachePtr->ref_count++, cachePtr->pixmap );
99    }
100
101    stippled_pixmap = XCreatePixmapFromBitmapData (display,
102			RootWindowOfScreen(screen), (char *)pixmap_bits,
103			pixmap_width, pixmap_height, fore, back, depth);
104
105    /* and insert it at the head of the cache */
106    cachePtr = XtNew(CacheEntry);
107    cachePtr->screen = screen;
108    cachePtr->foreground = fore;
109    cachePtr->background = back;
110    cachePtr->depth = depth;
111    cachePtr->pixmap = stippled_pixmap;
112    cachePtr->ref_count = 1;
113    cachePtr->next = pixmapCache;
114    pixmapCache = cachePtr;
115
116    return( stippled_pixmap );
117}
118
119void
120XmuReleaseStippledPixmap(Screen *screen, Pixmap pixmap)
121{
122    register Display *display = DisplayOfScreen(screen);
123    CacheEntry *cachePtr, **prevP;
124    for (prevP = &pixmapCache, cachePtr = pixmapCache; cachePtr;) {
125	if (cachePtr->screen == screen && cachePtr->pixmap == pixmap) {
126	    if (--cachePtr->ref_count == 0) {
127		XFreePixmap( display, pixmap );
128		*prevP = cachePtr->next;
129		XtFree( (char*)cachePtr );
130		break;
131	    }
132	}
133	prevP = &cachePtr->next;
134	cachePtr = *prevP;
135    }
136}
137