rrpointer.c revision 05b261ec 
1/*
2 * Copyright © 2006 Keith Packard
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission.  The copyright holders make no representations
11 * about the suitability of this software for any purpose.  It is provided "as
12 * is" without express or implied warranty.
13 *
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20 * OF THIS SOFTWARE.
21 */
22
23#include "randrstr.h"
24
25/*
26 * When the pointer moves, check to see if the specified position is outside
27 * any of theavailable CRTCs and move it to a 'sensible' place if so, where
28 * sensible is the closest monitor to the departing edge.
29 *
30 * Returns whether the position was adjusted
31 */
32
33static Bool
34RRCrtcContainsPosition (RRCrtcPtr crtc, int x, int y)
35{
36    RRModePtr   mode = crtc->mode;
37    int		scan_width, scan_height;
38
39    if (!mode)
40	return FALSE;
41
42    RRCrtcGetScanoutSize (crtc, &scan_width, &scan_height);
43
44    if (crtc->x <= x && x < crtc->x + scan_width &&
45	crtc->y <= y && y < crtc->y + scan_height)
46	return TRUE;
47    return FALSE;
48}
49
50/*
51 * Find the CRTC nearest the specified position, ignoring 'skip'
52 */
53static void
54RRPointerToNearestCrtc (ScreenPtr pScreen, int x, int y, RRCrtcPtr skip)
55{
56    rrScrPriv (pScreen);
57    int		c;
58    RRCrtcPtr	nearest = NULL;
59    int		best = 0;
60    int		best_dx = 0, best_dy = 0;
61
62    for (c = 0; c < pScrPriv->numCrtcs; c++)
63    {
64	RRCrtcPtr   crtc = pScrPriv->crtcs[c];
65	RRModePtr   mode = crtc->mode;
66	int	    dx, dy;
67	int	    dist;
68	int	    scan_width, scan_height;
69
70	if (!mode)
71	    continue;
72	if (crtc == skip)
73	    continue;
74
75	RRCrtcGetScanoutSize (crtc, &scan_width, &scan_height);
76
77	if (x < crtc->x)
78	    dx = crtc->x - x;
79	else if (x > crtc->x + scan_width)
80	    dx = x - (crtc->x + scan_width);
81	else
82	    dx = 0;
83	if (y < crtc->y)
84	    dy = crtc->y - x;
85	else if (y > crtc->y + scan_height)
86	    dy = y - (crtc->y + scan_height);
87	else
88	    dy = 0;
89	dist = dx + dy;
90	if (!nearest || dist < best)
91	{
92	    nearest = crtc;
93	    best_dx = dx;
94	    best_dy = dy;
95	}
96    }
97    if (best_dx || best_dy)
98	(*pScreen->SetCursorPosition) (pScreen, x + best_dx, y + best_dy, TRUE);
99    pScrPriv->pointerCrtc = nearest;
100}
101
102void
103RRPointerMoved (ScreenPtr pScreen, int x, int y)
104{
105    rrScrPriv (pScreen);
106    RRCrtcPtr	pointerCrtc = pScrPriv->pointerCrtc;
107    int	c;
108
109    /* Check last known CRTC */
110    if (pointerCrtc && RRCrtcContainsPosition (pointerCrtc, x, y))
111	return;
112
113    /* Check all CRTCs */
114    for (c = 0; c < pScrPriv->numCrtcs; c++)
115    {
116	RRCrtcPtr   crtc = pScrPriv->crtcs[c];
117
118	if (RRCrtcContainsPosition (crtc, x, y))
119	{
120	    /* Remember containing CRTC */
121	    pScrPriv->pointerCrtc = crtc;
122	    return;
123	}
124    }
125
126    /* None contain pointer, find nearest */
127    RRPointerToNearestCrtc (pScreen, x, y, pointerCrtc);
128}
129
130/*
131 * When the screen is reconfigured, move the pointer to the nearest
132 * CRTC
133 */
134void
135RRPointerScreenConfigured (ScreenPtr pScreen)
136{
137    WindowPtr	pRoot = GetCurrentRootWindow ();
138    ScreenPtr	pCurrentScreen = pRoot ? pRoot->drawable.pScreen : NULL;
139    int		x, y;
140
141    if (pScreen != pCurrentScreen)
142	return;
143    GetSpritePosition (&x, &y);
144    RRPointerToNearestCrtc (pScreen, x, y, NULL);
145}
146