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/*
* $Id$
*
* Copyright © 2003 Anders Carlsson
*
* 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 Anders Carlsson not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Anders Carlsson makes no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* ANDERS CARLSSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL ANDERS CARLSSON 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.
*/
/* $Header$ */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "kdrive.h"
typedef struct _RealOffscreenArea {
KdOffscreenArea area;
KdOffscreenMoveDataProc moveIn;
KdOffscreenMoveDataProc moveOut;
Bool locked;
struct _RealOffscreenArea *next;
struct _RealOffscreenArea *prev;
} RealOffscreenArea;
KdOffscreenArea *
KdOffscreenAlloc (ScreenPtr pScreen, int size, int align,
Bool locked,
KdOffscreenMoveDataProc moveIn,
KdOffscreenMoveDataProc moveOut,
pointer privData)
{
RealOffscreenArea *area;
KdScreenPriv (pScreen);
int tmp, real_size;
/* Go through the areas */
area = pScreenPriv->screen->off_screen_areas;
while (area != NULL)
{
if (area->area.screen != NULL)
{
area = area->next;
continue;
}
real_size = size;
tmp = (area->area.offset + area->area.size - size) % align;
if (tmp)
real_size += (align - tmp);
if (real_size <= area->area.size)
{
RealOffscreenArea *new_area;
if (real_size == area->area.size)
{
area->area.screen = pScreen;
area->area.privData = privData;
area->area.swappedOut = FALSE;
area->locked = locked;
area->moveIn = moveIn;
area->moveOut = moveOut;
return (KdOffscreenArea *)area;
}
/* Create a new area */
new_area = xalloc (sizeof (RealOffscreenArea));
new_area->area.offset = area->area.offset + area->area.size - real_size;
new_area->area.size = real_size;
new_area->area.screen = pScreen;
new_area->area.swappedOut = FALSE;
new_area->locked = locked;
new_area->moveIn = moveIn;
new_area->moveOut = moveOut;
area->area.size -= real_size;
new_area->prev = area;
new_area->next = area->next;
if (area->next)
area->next->prev = new_area;
area->next = new_area;
return (KdOffscreenArea *)new_area;
}
area = area->next;
}
/* Could not allocate memory */
return NULL;
}
void
KdOffscreenSwapOut (ScreenPtr pScreen)
{
KdScreenPriv (pScreen);
RealOffscreenArea *area = pScreenPriv->screen->off_screen_areas;
while (area)
{
if (area->area.screen && area->moveOut)
(*area->moveOut) ((KdOffscreenArea *)area);
area->area.swappedOut = TRUE;
area = area->next;
}
}
void
KdOffscreenSwapIn (ScreenPtr pScreen)
{
KdScreenPriv (pScreen);
RealOffscreenArea *area = pScreenPriv->screen->off_screen_areas;
while (area)
{
if (area->area.screen && area->moveIn)
(*area->moveIn) ((KdOffscreenArea *)area);
area->area.swappedOut = FALSE;
area = area->next;
}
}
void
KdOffscreenFree (KdOffscreenArea *area)
{
RealOffscreenArea *real_area = (RealOffscreenArea *)area;
real_area->area.screen = NULL;
if (real_area && real_area->next && !real_area->next->area.screen)
{
RealOffscreenArea *tmp;
real_area->next->prev = real_area->prev;
if (real_area->prev)
real_area->prev->next = real_area->next;
real_area->next->area.size += real_area->area.size;
real_area->next->area.offset = real_area->area.offset;
tmp = real_area->next;
xfree (real_area);
real_area = tmp;
}
if (real_area->prev && !real_area->prev->area.screen)
{
real_area->prev->next = real_area->next;
if (real_area->next)
real_area->next->prev = real_area->prev;
real_area->prev->area.size += real_area->area.size;
xfree (real_area);
}
}
Bool
KdOffscreenInit (ScreenPtr pScreen)
{
KdScreenPriv (pScreen);
RealOffscreenArea *area;
/* Allocate a big free area */
area = xalloc (sizeof (RealOffscreenArea));
if (!area)
return FALSE;
area->area.screen = NULL;
area->area.offset = pScreenPriv->screen->off_screen_base;
area->area.size = pScreenPriv->screen->off_screen_size;
area->area.swappedOut = FALSE;
area->next = NULL;
area->prev = NULL;
/* Add it to the free areas */
pScreenPriv->screen->off_screen_areas = area;
return TRUE;
}
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