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/*
* Copyright © 2006 Keith Packard
*
* 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, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include "randrstr.h"
/*
* When the pointer moves, check to see if the specified position is outside
* any of theavailable CRTCs and move it to a 'sensible' place if so, where
* sensible is the closest monitor to the departing edge.
*
* Returns whether the position was adjusted
*/
static Bool
RRCrtcContainsPosition(RRCrtcPtr crtc, int x, int y)
{
RRModePtr mode = crtc->mode;
int scan_width, scan_height;
if (!mode)
return FALSE;
RRCrtcGetScanoutSize(crtc, &scan_width, &scan_height);
if (crtc->x <= x && x < crtc->x + scan_width &&
crtc->y <= y && y < crtc->y + scan_height)
return TRUE;
return FALSE;
}
/*
* Find the CRTC nearest the specified position, ignoring 'skip'
*/
static void
RRPointerToNearestCrtc(ScreenPtr pScreen, int x, int y, RRCrtcPtr skip)
{
rrScrPriv(pScreen);
int c;
RRCrtcPtr nearest = NULL;
int best = 0;
int best_dx = 0, best_dy = 0;
for (c = 0; c < pScrPriv->numCrtcs; c++) {
RRCrtcPtr crtc = pScrPriv->crtcs[c];
RRModePtr mode = crtc->mode;
int dx, dy;
int dist;
int scan_width, scan_height;
if (!mode)
continue;
if (crtc == skip)
continue;
RRCrtcGetScanoutSize(crtc, &scan_width, &scan_height);
if (x < crtc->x)
dx = crtc->x - x;
else if (x > crtc->x + scan_width)
dx = x - (crtc->x + scan_width);
else
dx = 0;
if (y < crtc->y)
dy = crtc->y - x;
else if (y > crtc->y + scan_height)
dy = y - (crtc->y + scan_height);
else
dy = 0;
dist = dx + dy;
if (!nearest || dist < best) {
nearest = crtc;
best_dx = dx;
best_dy = dy;
}
}
if (best_dx || best_dy)
(*pScreen->SetCursorPosition) (pScreen, x + best_dx, y + best_dy, TRUE);
pScrPriv->pointerCrtc = nearest;
}
void
RRPointerMoved(ScreenPtr pScreen, int x, int y)
{
rrScrPriv(pScreen);
RRCrtcPtr pointerCrtc = pScrPriv->pointerCrtc;;
int c;
/* Check last known CRTC */
if (pointerCrtc && RRCrtcContainsPosition(pointerCrtc, x, y))
return;
/* Check all CRTCs */
for (c = 0; c < pScrPriv->numCrtcs; c++) {
RRCrtcPtr crtc = pScrPriv->crtcs[c];
if (RRCrtcContainsPosition(crtc, x, y)) {
/* Remember containing CRTC */
pScrPriv->pointerCrtc = crtc;
return;
}
}
/* None contain pointer, find nearest */
RRPointerToNearestCrtc(pScreen, x, y, pointerCrtc);
}
/*
* When the screen is reconfigured, move the pointer to the nearest
* CRTC
*/
void
RRPointerScreenConfigured(ScreenPtr pScreen)
{
WindowPtr pRoot = GetCurrentRootWindow();
ScreenPtr pCurrentScreen = pRoot ? pRoot->drawable.pScreen : NULL;
int x, y;
if (pScreen != pCurrentScreen)
return;
GetSpritePosition(&x, &y);
RRPointerToNearestCrtc(pScreen, x, y, NULL);
}