1/*
2
3Copyright 1989, 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#ifdef HAVE_CONFIG_H
28#include <config.h>
29#endif
30#include "Xlibint.h"
31#include "Xutil.h"
32
33static int _GeometryMaskToGravity(
34    int mask);
35
36/*
37 * This routine given a user supplied positional argument and a default
38 * argument (fully qualified) will return the position the window should take
39 * as well as the gravity to be set in the WM_NORMAL_HINTS size hints.
40 * Always sets all return values and returns a mask describing which fields
41 * were set by the user or'ed with whether or not the x and y values should
42 * be considered "negative".
43 */
44
45int
46XWMGeometry (
47    Display *dpy,			/* user's display connection */
48    int screen,				/* screen on which to do computation */
49    _Xconst char *user_geom,		/* user provided geometry spec */
50    _Xconst char *def_geom,		/* default geometry spec for window */
51    unsigned int bwidth,		/* border width */
52    XSizeHints *hints,			/* usually WM_NORMAL_HINTS */
53    int *x_return,			/* location of window */
54    int *y_return,			/* location of window */
55    int *width_return,			/* size of window */
56    int *height_return,			/* size of window */
57    int *gravity_return)		/* gravity of window */
58{
59    int ux, uy;				/* returned values from parse */
60    unsigned int uwidth, uheight;	/* returned values from parse */
61    int umask;				/* parse mask of returned values */
62    int dx, dy;				/* default values from parse */
63    unsigned int dwidth, dheight;	/* default values from parse */
64    int dmask;				/* parse mask of returned values */
65    int base_width, base_height;	/* valid amounts */
66    int min_width, min_height;		/* valid amounts */
67    int width_inc, height_inc;		/* valid amounts */
68    int rx, ry, rwidth, rheight;	/* return values */
69    int rmask;				/* return mask */
70
71    /*
72     * Get the base sizes and increments.  Section 4.1.2.3 of the ICCCM
73     * states that the base and minimum sizes are defaults for each other.
74     * If neither is given, then the base sizes should be 0.  These parameters
75     * control the sets of sizes that window managers should allow for the
76     * window according to the following formulae:
77     *
78     *          width = base_width  + (i * width_inc)
79     *         height = base_height + (j * height_inc)
80     */
81    base_width =  ((hints->flags & PBaseSize) ? hints->base_width :
82		   ((hints->flags & PMinSize) ? hints->min_width : 0));
83    base_height = ((hints->flags & PBaseSize) ? hints->base_height :
84		   ((hints->flags & PMinSize) ? hints->min_height : 0));
85    min_width = ((hints->flags & PMinSize) ? hints->min_width : base_width);
86    min_height = ((hints->flags & PMinSize) ? hints->min_height : base_height);
87    width_inc = (hints->flags & PResizeInc) ? hints->width_inc : 1;
88    height_inc = (hints->flags & PResizeInc) ? hints->height_inc : 1;
89
90
91    /*
92     * parse the two geometry masks
93     */
94    rmask = umask = XParseGeometry (user_geom, &ux, &uy, &uwidth, &uheight);
95    dmask = XParseGeometry (def_geom, &dx, &dy, &dwidth, &dheight);
96
97
98    /*
99     * get the width and height:
100     *     1.  if user-specified, then take that value
101     *     2.  else, if program-specified, then take that value
102     *     3.  else, take 1
103     *     4.  multiply by the size increment
104     *     5.  and add to the base size
105     */
106    rwidth = ((((umask & WidthValue) ? uwidth :
107		((dmask & WidthValue) ? dwidth : 1)) * width_inc) +
108	      base_width);
109    rheight = ((((umask & HeightValue) ? uheight :
110		 ((dmask & HeightValue) ? dheight : 1)) * height_inc) +
111	       base_height);
112
113    /*
114     * Make sure computed size is within limits.  Note that we always do the
115     * lower bounds check since the base size (which defaults to 0) should
116     * be used if a minimum size isn't specified.
117     */
118    if (rwidth < min_width) rwidth = min_width;
119    if (rheight < min_height) rheight = min_height;
120
121    if (hints->flags & PMaxSize) {
122	if (rwidth > hints->max_width) rwidth = hints->max_width;
123	if (rheight > hints->max_height) rheight = hints->max_height;
124    }
125
126
127    /*
128     * Compute the location.  Set the negative flags in the return mask
129     * (and watch out for borders), if necessary.
130     */
131    if (umask & XValue) {
132	rx = ((umask & XNegative) ?
133	      (DisplayWidth (dpy, screen) + ux - rwidth - 2 * bwidth) : ux);
134    } else if (dmask & XValue) {
135	if (dmask & XNegative) {
136	    rx = (DisplayWidth (dpy, screen) + dx - rwidth - 2 * bwidth);
137	    rmask |= XNegative;
138	} else
139	  rx = dx;
140    } else {
141	rx = 0;				/* gotta choose something... */
142    }
143
144    if (umask & YValue) {
145	ry = ((umask & YNegative) ?
146	      (DisplayHeight(dpy, screen) + uy - rheight - 2 * bwidth) : uy);
147    } else if (dmask & YValue) {
148	if (dmask & YNegative) {
149	    ry = (DisplayHeight(dpy, screen) + dy - rheight - 2 * bwidth);
150	    rmask |= YNegative;
151	} else
152	  ry = dy;
153    } else {
154	ry = 0;				/* gotta choose something... */
155    }
156
157
158    /*
159     * All finished, so set the return variables.
160     */
161    *x_return = rx;
162    *y_return = ry;
163    *width_return = rwidth;
164    *height_return = rheight;
165    *gravity_return = _GeometryMaskToGravity (rmask);
166    return rmask;
167}
168
169
170static int _GeometryMaskToGravity(
171    int mask)
172{
173    switch (mask & (XNegative|YNegative)) {
174      case 0:
175        return NorthWestGravity;
176      case XNegative:
177        return NorthEastGravity;
178      case YNegative:
179        return SouthWestGravity;
180      default:
181        return SouthEastGravity;
182    }
183}
184