1 /* bubbles.h - definitions for bubbles screensaver */
3 /* $Id: bubbles.h,v 1.6 2006/02/25 20:11:57 jwz Exp $ */
11 # include <X11/Xlib.h>
14 /***************************************************************************
15 * Options you might like to change to affect the program's behaviour *
16 ***************************************************************************/
19 * Uncommenting the following will enable support for reading bubbles from
20 * files (using the -file and -directory options to bubbles). This is
21 * disabled by default since such operations are inherently non-portable
22 * and we want the program to compile on as many systems as possible.
24 * If you uncomment this and you figure out how to get it working, please
25 * let me (J.Macnicol@student.anu.edu.au) know. Diffs against the standard
26 * distribution would be appreciated. Possible sources of problems are
27 * dirent and possibly the use of tmpnam().
30 /* #define BUBBLES_IO */
33 * The following only makes sense if BUBBLES_IO above is defined.
35 * Uncomment the following if you always want to use the -file or
36 * -directory options on the command line and never to use a default bubble
37 * compiled into the program. This way you would save memory and disk space
38 * since if you do use -file or -directory only one bubble will be loaded
39 * into memory at any one time (and remember the default bubble is really
40 * uncompressed, unlike bubbles in files which can be compressed). This
41 * is disabled by default only so people running the program for the first
42 * time with no knowldege of the command line options don't get error
45 * NOTE: You will still need to have a bubbles_default.c file, else the
46 * build sequence will fail. Well constructed bubbles_default.c files
47 * have #ifdef's which simply exclude everything else in the file at
48 * compile time. The bubblestodefault script does this.
51 /* #define NO_DEFAULT_BUBBLE */
54 * This turns on any debugging messages and sanity checks. Hopefully you
55 * won't need this :) It slows things down a bit, too.
57 * NOTE: If you uncomment this you will get some messages about unused
58 * functions when you compile. You can ignore these - they refer to
59 * convenient checking routines which simply aren't called but are left
60 * in case someone wants to use them.
65 /***************************************************************************
66 * Things you might need to change to get things working right *
67 ***************************************************************************/
70 * Name of the gzip binary. You shouldn't need to change this unless it's
71 * not in your PATH when the program is run, in which case you will need to
72 * substitute the full path here. Keep the double quotes else things won't
79 * Likewise for the Bourne shell.
85 * The name of the directory entry structure is different under Linux
86 * (under which this code is being developed) than other systems. The case
87 * alternate form here is that given in Kernighan & Ritchie's C book (which
88 * must be authoratitive, no?)
90 * 04/07/96 : People will have to hack this to get it working on some
91 * systems. I believe it doesn't work on SGI, for example.
95 #define STRUCT_DIRENT struct dirent
97 #define STRUCT_DIRENT Dirent
101 * The naming of fields in struct dirent also seems to differ from system to
102 * system. This may have to be extended to make things truly portable.
103 * What we want here is the name field from a dirent struct pointed to
106 * 04/07/96 : See above. This may need to be changed too.
110 #define DIRENT_NAME dp->d_name
112 #define DIRENT_NAME dp->name
115 /* I don't know why this isn't defined. */
117 /* apparently it is defined in recent linuxes. who knows. */
118 /*extern char *tempnam(char *, char *);*/
121 /****************************************************************************
122 * Buffer lengths and things you probably won't need to touch *
123 ****************************************************************************/
125 /* Maximum length of a full path name we can deal with */
126 #define PATH_BUF_SIZE 1024
128 /* Size of string passed to shell as command */
129 #define COMMAND_BUF_SIZE 2500
131 /* Size increments for read_line() buffers */
132 #define READ_LINE_BUF_SIZE 24
134 /* Maximum amount to drop a bubble */
135 #define MAX_DROPPAGE 20
137 /****************************************************************************
139 ****************************************************************************/
141 /* Some machines define M_PI and not PI. If they don't define either, use
142 own own. Really, the accuracy of this is _not_ very important. */
146 # define M_PI 3.1415926535
150 /* for delete_bubble_in_mesh() */
151 #define DELETE_BUBBLE 0
152 #define KEEP_BUBBLE 1
154 /* Status codes for read_line */
156 #define EOF_REACHED 1
160 * Magic number for Bubble struct, in case it's trashed when debugging code
161 * (which happened to me often.... :(
164 #define BUBBLE_MAGIC 5674
167 #define MAX(A, B) ((A) > (B) ? (A) : (B))
168 #define MIN(A, B) ((A) < (B) ? (A) : (B))
170 /* How we represent bubbles */
173 int step; /* for rendered bubbles */
184 typedef struct bub Bubble;
187 * How we represent pixmaps of rendered bubbles. Because the range of radii
188 * available may not be continuous, we call each a step (for the lack of a
196 Pixmap ball, shape_mask;
197 GC draw_gc, erase_gc;
198 struct bub_step *next;
201 typedef struct bub_step Bubble_Step;
203 extern void init_default_bubbles(void);
204 extern int num_default_bubbles;
205 typedef struct { const unsigned char *png; unsigned long size; } bubble_png;
206 extern bubble_png default_bubbles[];
208 #endif /* _BUBBLES_H_ */