1 /* bubbles.h - definitions for bubbles screensaver */
3 /* $Id: bubbles.h,v 1.2 1997/05/19 03:26:05 jwz Exp $ */
12 /***************************************************************************
13 * Options you might like to change to affect the program's behaviour *
14 ***************************************************************************/
17 * Uncommenting the following will enable support for reading bubbles from
18 * files (using the -file and -directory options to bubbles). This is
19 * disabled by default since such operations are inherently non-portable
20 * and we want the program to compile on as many systems as possible.
22 * If you uncomment this and you figure out how to get it working, please
23 * let me (J.Macnicol@student.anu.edu.au) know. Diffs against the standard
24 * distribution would be appreciated. Possible sources of problems are
25 * dirent and possibly the use of tmpnam().
28 /* #define BUBBLES_IO */
31 * The following only makes sense if BUBBLES_IO above is defined.
33 * Uncomment the following if you always want to use the -file or
34 * -directory options on the command line and never to use a default bubble
35 * compiled into the program. This way you would save memory and disk space
36 * since if you do use -file or -directory only one bubble will be loaded
37 * into memory at any one time (and remember the default bubble is really
38 * uncompressed, unlike bubbles in files which can be compressed). This
39 * is disabled by default only so people running the program for the first
40 * time with no knowldege of the command line options don't get error
43 * NOTE: You will still need to have a bubbles_default.c file, else the
44 * build sequence will fail. Well constructed bubbles_default.c files
45 * have #ifdef's which simply exclude everything else in the file at
46 * compile time. The bubblestodefault script does this.
49 /* #define NO_DEFAULT_BUBBLE */
52 * This turns on any debugging messages and sanity checks. Hopefully you
53 * won't need this :) It slows things down a bit, too.
55 * NOTE: If you uncomment this you will get some messages about unused
56 * functions when you compile. You can ignore these - they refer to
57 * convenient checking routines which simply aren't called but are left
58 * in case someone wants to use them.
63 /***************************************************************************
64 * Things you might need to change to get things working right *
65 ***************************************************************************/
68 * Name of the gzip binary. You shouldn't need to change this unless it's
69 * not in your PATH when the program is run, in which case you will need to
70 * substitute the full path here. Keep the double quotes else things won't
77 * Likewise for the Bourne shell.
83 * The name of the directory entry structure is different under Linux
84 * (under which this code is being developed) than other systems. The case
85 * alternate form here is that given in Kernighan & Ritchie's C book (which
86 * must be authoratitive, no?)
88 * 04/07/96 : People will have to hack this to get it working on some
89 * systems. I believe it doesn't work on SGI, for example.
93 #define STRUCT_DIRENT struct dirent
95 #define STRUCT_DIRENT Dirent
99 * The naming of fields in struct dirent also seems to differ from system to
100 * system. This may have to be extended to make things truly portable.
101 * What we want here is the name field from a dirent struct pointed to
104 * 04/07/96 : See above. This may need to be changed too.
108 #define DIRENT_NAME dp->d_name
110 #define DIRENT_NAME dp->name
113 /* I don't know why this isn't defined. */
115 /* apparently it is defined in recent linuxes. who knows. */
116 /*extern char *tempnam(char *, char *);*/
119 /****************************************************************************
120 * Buffer lengths and things you probably won't need to touch *
121 ****************************************************************************/
123 /* Maximum length of a full path name we can deal with */
124 #define PATH_BUF_SIZE 1024
126 /* Size of string passed to shell as command */
127 #define COMMAND_BUF_SIZE 2500
129 /* Size increments for read_line() buffers */
130 #define READ_LINE_BUF_SIZE 24
132 /****************************************************************************
134 ****************************************************************************/
136 /* Some machines define M_PI and not PI. If they don't define either, use
137 own own. Really, the accuracy of this is _not_ very important. */
141 # define M_PI 3.1415926535
145 /* for delete_bubble_in_mesh() */
146 #define DELETE_BUBBLE 0
147 #define KEEP_BUBBLE 1
149 /* Status codes for read_line */
151 #define EOF_REACHED 1
155 * Magic number for Bubble struct, in case it's trashed when debugging code
156 * (which happened to me often.... :(
159 #define BUBBLE_MAGIC 5674
162 #define MAX(A, B) ((A) > (B) ? (A) : (B))
163 #define MIN(A, B) ((A) < (B) ? (A) : (B))
165 /* How we represent bubbles */
168 int step; /* for rendered bubbles */
179 typedef struct bub Bubble;
182 * How we represent pixmaps of rendered bubbles. Because the range of radii
183 * available may not be continuous, we call each a step (for the lack of a
191 Pixmap ball, shape_mask;
192 GC draw_gc, erase_gc;
193 XpmAttributes xpmattrs;
194 struct bub_step *next;
197 typedef struct bub_step Bubble_Step;
198 #endif /* HAVE_XPM */
200 /* Make sure default bubble isn't compiled when we don't have XPM
201 Disable file I/O code too. */
203 # define NO_DEFAULT_BUBBLE
205 #endif /* HAVE_XPM */
207 /* Make sure default bubble is compiled in when we have XPM and no file I/O */
210 # undef NO_DEFAULT_BUBBLE
211 # endif /* BUBBLES_IO */
212 #endif /* HAVE_XPM */
214 #endif /* _BUBBLES_H_ */