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-rw-r--r--xorg-server/randr/rrpointer.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/xorg-server/randr/rrpointer.c b/xorg-server/randr/rrpointer.c
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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);
+}