xserver/hw/dmx/input/dmxmotion.c

/*
 * Copyright 2002-2003 Red Hat Inc., Durham, North Carolina.
 *
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation on the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * Authors:
 *   Rickard E. (Rik) Faith <faith@redhat.com>
 *
 */

/** \file
 * This file provides functions similar to miPointerGetMotionEvents and
 * miPointerPutMotionEvents, with the exception that devices with more
 * than two axes are fully supported.  These routines may be used only
 * for motion buffers for extension devices, and are \a not compatible
 * replacements for the mi routines.  */

#ifdef HAVE_DMX_CONFIG_H
#include <dmx-config.h>
#endif

#include "inputstr.h"
#include "dmxinputinit.h"
#include "dmxcommon.h"
#include "dmxmotion.h"

#define OFFSET(offset,element) ((offset) * (numAxes + 1) + (element))

/** Return size of motion buffer. \see DMX_MOTION_SIZE */
int dmxPointerGetMotionBufferSize(void)
{
    return DMX_MOTION_SIZE;
}

/** This routine performs the same function as \a miPointerGetMotionEvents:
 * the events in the motion history that are between the start and stop
 * times (in mS) are placed in the coords vector, and the count of the
 * number of items so placed is returned.  This routine is called from
 * dix/devices.c so that coords can hold valuator->numMotionEvents
 * events.  This routine is called from \a Xi/gtmotion.c with coords large
 * enough to hold the same number of events in a variable-length
 * extended \a xTimecoord structure.  This provides sufficient data for the
 * \a XGetDeviceMotionEvents library call, and would be identical to
 * \a miPointerGetMotionEvents for devices with only 2 axes (i.e., core
 * pointers) if \a xTimecoord used 32bit integers.
 *
 * Because DMX uses the mi* routines for all core devices, this routine
 * only has to support extension devices using the polymorphic coords.
 * Because compatibility with miPointerGetMotionEvents is not possible,
 * it is not provided. */
int dmxPointerGetMotionEvents(DeviceIntPtr pDevice,
                              xTimecoord *coords,
                              unsigned long start,
                              unsigned long stop,
                              ScreenPtr pScreen)
{
    GETDMXLOCALFROMPDEVICE;
    int           numAxes = pDevice->valuator->numAxes;
    unsigned long *c      = (unsigned long *)coords;
    int           count   = 0;
    int           i, j;

    if (!dmxLocal->history) return 0;
    for (i = dmxLocal->head; i != dmxLocal->tail;) {
        if (dmxLocal->history[OFFSET(i,0)] >= stop) break;
        if (dmxLocal->history[OFFSET(i,0)] >= start) {
            for (j = 0; j < numAxes + 1; j++)
                c[OFFSET(count,j)] = dmxLocal->history[OFFSET(i,j)];
            ++count;
        }
        if (++i >= DMX_MOTION_SIZE) i = 0;
    }
    return count;
}

/** This routine adds an event to the motion history.  A similar
 * function is performed by miPointerMove for the mi versions of these
 * routines. */
void dmxPointerPutMotionEvent(DeviceIntPtr pDevice,
                              int firstAxis, int axesCount, int *v,
                              unsigned long time)
{
    GETDMXLOCALFROMPDEVICE;
    int           numAxes = pDevice->valuator->numAxes;
    int           i;

    if (!dmxLocal->history) {
        dmxLocal->history   = xalloc(sizeof(*dmxLocal->history)
                                     * (numAxes + 1)
                                     * DMX_MOTION_SIZE);
        dmxLocal->head      = 0;
        dmxLocal->tail      = 0;
        dmxLocal->valuators = calloc(sizeof(*dmxLocal->valuators), numAxes);
    } else {
        if (++dmxLocal->tail >= DMX_MOTION_SIZE) dmxLocal->tail = 0;
        if (dmxLocal->head == dmxLocal->tail)
            if (++dmxLocal->head >= DMX_MOTION_SIZE) dmxLocal->head = 0;
    }

    dmxLocal->history[OFFSET(dmxLocal->tail,0)] = time;

                                /* Initialize the data from the known
                                 * values (if Absolute) or to zero (if
                                 * Relative) */
    if (pDevice->valuator->mode == Absolute) {
        for (i = 0; i < numAxes; i++) 
            dmxLocal->history[OFFSET(dmxLocal->tail,i+1)]
                = dmxLocal->valuators[i];
    } else {
        for (i = 0; i < numAxes; i++) 
            dmxLocal->history[OFFSET(dmxLocal->tail,i+1)] = 0;
    }
    
    for (i = firstAxis; i < axesCount; i++) {
        dmxLocal->history[OFFSET(dmxLocal->tail,i+i)]
            = (unsigned long)v[i-firstAxis];
        dmxLocal->valuators[i] = v[i-firstAxis];
    }
}