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+/* $Xorg: WMGeom.c,v 1.4 2001/02/09 02:03:37 xorgcvs Exp $ */
+/*
+
+Copyright 1989, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+*/
+/* $XFree86: xc/lib/X11/WMGeom.c,v 1.3 2003/04/13 19:22:18 dawes Exp $ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#include "Xutil.h"
+
+static int _GeometryMaskToGravity(
+ int mask);
+
+/*
+ * This routine given a user supplied positional argument and a default
+ * argument (fully qualified) will return the position the window should take
+ * as well as the gravity to be set in the WM_NORMAL_HINTS size hints.
+ * Always sets all return values and returns a mask describing which fields
+ * were set by the user or'ed with whether or not the x and y values should
+ * be considered "negative".
+ */
+
+int
+XWMGeometry (
+ Display *dpy, /* user's display connection */
+ int screen, /* screen on which to do computation */
+ _Xconst char *user_geom, /* user provided geometry spec */
+ _Xconst char *def_geom, /* default geometry spec for window */
+ unsigned int bwidth, /* border width */
+ XSizeHints *hints, /* usually WM_NORMAL_HINTS */
+ int *x_return, /* location of window */
+ int *y_return, /* location of window */
+ int *width_return, /* size of window */
+ int *height_return, /* size of window */
+ int *gravity_return) /* gravity of window */
+{
+ int ux, uy; /* returned values from parse */
+ unsigned int uwidth, uheight; /* returned values from parse */
+ int umask; /* parse mask of returned values */
+ int dx, dy; /* default values from parse */
+ unsigned int dwidth, dheight; /* default values from parse */
+ int dmask; /* parse mask of returned values */
+ int base_width, base_height; /* valid amounts */
+ int min_width, min_height; /* valid amounts */
+ int width_inc, height_inc; /* valid amounts */
+ int rx, ry, rwidth, rheight; /* return values */
+ int rmask; /* return mask */
+
+ /*
+ * Get the base sizes and increments. Section 4.1.2.3 of the ICCCM
+ * states that the base and minimum sizes are defaults for each other.
+ * If neither is given, then the base sizes should be 0. These parameters
+ * control the sets of sizes that window managers should allow for the
+ * window according to the following formulae:
+ *
+ * width = base_width + (i * width_inc)
+ * height = base_height + (j * height_inc)
+ */
+ base_width = ((hints->flags & PBaseSize) ? hints->base_width :
+ ((hints->flags & PMinSize) ? hints->min_width : 0));
+ base_height = ((hints->flags & PBaseSize) ? hints->base_height :
+ ((hints->flags & PMinSize) ? hints->min_height : 0));
+ min_width = ((hints->flags & PMinSize) ? hints->min_width : base_width);
+ min_height = ((hints->flags & PMinSize) ? hints->min_height : base_height);
+ width_inc = (hints->flags & PResizeInc) ? hints->width_inc : 1;
+ height_inc = (hints->flags & PResizeInc) ? hints->height_inc : 1;
+
+
+ /*
+ * parse the two geometry masks
+ */
+ rmask = umask = XParseGeometry (user_geom, &ux, &uy, &uwidth, &uheight);
+ dmask = XParseGeometry (def_geom, &dx, &dy, &dwidth, &dheight);
+
+
+ /*
+ * get the width and height:
+ * 1. if user-specified, then take that value
+ * 2. else, if program-specified, then take that value
+ * 3. else, take 1
+ * 4. multiply by the size increment
+ * 5. and add to the base size
+ */
+ rwidth = ((((umask & WidthValue) ? uwidth :
+ ((dmask & WidthValue) ? dwidth : 1)) * width_inc) +
+ base_width);
+ rheight = ((((umask & HeightValue) ? uheight :
+ ((dmask & HeightValue) ? dheight : 1)) * height_inc) +
+ base_height);
+
+ /*
+ * Make sure computed size is within limits. Note that we always do the
+ * lower bounds check since the base size (which defaults to 0) should
+ * be used if a minimum size isn't specified.
+ */
+ if (rwidth < min_width) rwidth = min_width;
+ if (rheight < min_height) rheight = min_height;
+
+ if (hints->flags & PMaxSize) {
+ if (rwidth > hints->max_width) rwidth = hints->max_width;
+ if (rheight > hints->max_height) rheight = hints->max_height;
+ }
+
+
+ /*
+ * Compute the location. Set the negative flags in the return mask
+ * (and watch out for borders), if necessary.
+ */
+ if (umask & XValue) {
+ rx = ((umask & XNegative) ?
+ (DisplayWidth (dpy, screen) + ux - rwidth - 2 * bwidth) : ux);
+ } else if (dmask & XValue) {
+ if (dmask & XNegative) {
+ rx = (DisplayWidth (dpy, screen) + dx - rwidth - 2 * bwidth);
+ rmask |= XNegative;
+ } else
+ rx = dx;
+ } else {
+ rx = 0; /* gotta choose something... */
+ }
+
+ if (umask & YValue) {
+ ry = ((umask & YNegative) ?
+ (DisplayHeight(dpy, screen) + uy - rheight - 2 * bwidth) : uy);
+ } else if (dmask & YValue) {
+ if (dmask & YNegative) {
+ ry = (DisplayHeight(dpy, screen) + dy - rheight - 2 * bwidth);
+ rmask |= YNegative;
+ } else
+ ry = dy;
+ } else {
+ ry = 0; /* gotta choose something... */
+ }
+
+
+ /*
+ * All finished, so set the return variables.
+ */
+ *x_return = rx;
+ *y_return = ry;
+ *width_return = rwidth;
+ *height_return = rheight;
+ *gravity_return = _GeometryMaskToGravity (rmask);
+ return rmask;
+}
+
+
+static int _GeometryMaskToGravity(
+ int mask)
+{
+ switch (mask & (XNegative|YNegative)) {
+ case 0:
+ return NorthWestGravity;
+ case XNegative:
+ return NorthEastGravity;
+ case YNegative:
+ return SouthWestGravity;
+ default:
+ return SouthEastGravity;
+ }
+}
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