Limit pointer to valid crtc areas. Add event swapping. Fix change tracking.

Add function to keep pointer within valid crtc areas.
Finish event delivery and swapping code.
Separate configuration from layout changes to send correct events.

1 files changed, 137 insertions, 0 deletions

diff --git a/randr/rrpointer.c b/randr/rrpointer.c
new file mode 100644
index 000000000..7ba0460f5
--- /dev/null
+++ b/randr/rrpointer.c
@@ -0,0 +1,137 @@
+/*
+ * 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;
+    
+    if (!mode)
+	return FALSE;
+    if (crtc->x <= x && x < crtc->x + mode->mode.width &&
+	crtc->y <= y && y < crtc->y + mode->mode.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;
+
+	if (!mode)
+	    continue;
+	if (crtc == skip)
+	    continue;
+	if (x < crtc->x)
+	    dx = crtc->x - x;
+	else if (x > crtc->x + mode->mode.width)
+	    dx = x - (crtc->x + mode->mode.width);
+	else
+	    dx = 0;
+	if (y < crtc->y)
+	    dy = crtc->y - x;
+	else if (y > crtc->y + mode->mode.height)
+	    dy = y - (crtc->y + mode->mode.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 FALSE;
+    GetSpritePosition (&x, &y);
+    RRPointerToNearestCrtc (pScreen, x, y, NULL);
+}