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#include "inputstr.h"
25
26/*
27 * When the pointer moves, check to see if the specified position is outside
28 * any of theavailable CRTCs and move it to a 'sensible' place if so, where
29 * sensible is the closest monitor to the departing edge.
30 *
31 * Returns whether the position was adjusted
32 */
33
34static Bool
35RRCrtcContainsPosition(RRCrtcPtr crtc, int x, int y)
36{
37    RRModePtr mode = crtc->mode;
38    int scan_width, scan_height;
39
40    if (!mode)
41        return FALSE;
42
43    RRCrtcGetScanoutSize(crtc, &scan_width, &scan_height);
44
45    if (crtc->x <= x && x < crtc->x + scan_width &&
46        crtc->y <= y && y < crtc->y + scan_height)
47        return TRUE;
48    return FALSE;
49}
50
51/*
52 * Find the CRTC nearest the specified position, ignoring 'skip'
53 */
54static void
55RRPointerToNearestCrtc(DeviceIntPtr pDev, ScreenPtr pScreen, int x, int y,
56                       RRCrtcPtr skip)
57{
58    rrScrPriv(pScreen);
59    int c;
60    RRCrtcPtr nearest = NULL;
61    int best = 0;
62    int best_dx = 0, best_dy = 0;
63
64    for (c = 0; c < pScrPriv->numCrtcs; c++) {
65        RRCrtcPtr crtc = pScrPriv->crtcs[c];
66        RRModePtr mode = crtc->mode;
67        int dx, dy;
68        int dist;
69        int scan_width, scan_height;
70
71        if (!mode)
72            continue;
73        if (crtc == skip)
74            continue;
75
76        RRCrtcGetScanoutSize(crtc, &scan_width, &scan_height);
77
78        if (x < crtc->x)
79            dx = crtc->x - x;
80        else if (x > crtc->x + scan_width - 1)
81            dx = crtc->x + (scan_width - 1) - x;
82        else
83            dx = 0;
84        if (y < crtc->y)
85            dy = crtc->y - y;
86        else if (y > crtc->y + scan_height - 1)
87            dy = crtc->y + (scan_height - 1) - y;
88        else
89            dy = 0;
90        dist = dx * dx + dy * dy;
91        if (!nearest || dist < best) {
92            nearest = crtc;
93            best_dx = dx;
94            best_dy = dy;
95            best = dist;
96        }
97    }
98    if (best_dx || best_dy)
99        (*pScreen->SetCursorPosition) (pDev, pScreen, x + best_dx, y + best_dy,
100                                       TRUE);
101    pScrPriv->pointerCrtc = nearest;
102}
103
104void
105RRPointerMoved(ScreenPtr pScreen, int x, int y)
106{
107    rrScrPriv(pScreen);
108    RRCrtcPtr pointerCrtc = pScrPriv->pointerCrtc;
109    int c;
110
111    /* Check last known CRTC */
112    if (pointerCrtc && RRCrtcContainsPosition(pointerCrtc, x, y))
113        return;
114
115    /* Check all CRTCs */
116    for (c = 0; c < pScrPriv->numCrtcs; c++) {
117        RRCrtcPtr crtc = pScrPriv->crtcs[c];
118
119        if (RRCrtcContainsPosition(crtc, x, y)) {
120            /* Remember containing CRTC */
121            pScrPriv->pointerCrtc = crtc;
122            return;
123        }
124    }
125
126    /* None contain pointer, find nearest */
127    ErrorF("RRPointerMoved: Untested, may cause \"bogus pointer event\"\n");
128    RRPointerToNearestCrtc(inputInfo.pointer, pScreen, x, y, pointerCrtc);
129}
130
131/*
132 * When the screen is reconfigured, move all pointers to the nearest
133 * CRTC
134 */
135void
136RRPointerScreenConfigured(ScreenPtr pScreen)
137{
138    WindowPtr pRoot;
139    ScreenPtr pCurrentScreen;
140    int x, y;
141    DeviceIntPtr pDev;
142
143    for (pDev = inputInfo.devices; pDev; pDev = pDev->next) {
144        if (IsPointerDevice(pDev)) {
145            pRoot = GetCurrentRootWindow(pDev);
146            pCurrentScreen = pRoot ? pRoot->drawable.pScreen : NULL;
147
148            if (pScreen == pCurrentScreen) {
149                GetSpritePosition(pDev, &x, &y);
150                RRPointerToNearestCrtc(pDev, pScreen, x, y, NULL);
151            }
152        }
153    }
154}
155