376 lines
8.9 KiB
C
376 lines
8.9 KiB
C
/*
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* Copyright © 2003 Anders Carlsson
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Anders Carlsson not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Anders Carlsson makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* ANDERS CARLSSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL ANDERS CARLSSON BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <kdrive-config.h>
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#endif
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#include "kdrive.h"
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#include "kaa.h"
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#define DEBUG_OFFSCREEN 0
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#if DEBUG_OFFSCREEN
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#define DBG_OFFSCREEN(a) ErrorF a
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#else
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#define DBG_OFFSCREEN(a)
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#endif
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#if DEBUG_OFFSCREEN
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static void
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KdOffscreenValidate (ScreenPtr pScreen)
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{
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KdScreenPriv (pScreen);
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KdOffscreenArea *prev = 0, *area;
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assert (pScreenPriv->screen->off_screen_areas->area.offset == 0);
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for (area = pScreenPriv->off_screen_areas; area; area = area->next)
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{
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if (prev)
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assert (prev->offset + prev->size == area->offset);
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prev = area;
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}
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assert (prev->offset + prev->size == pScreenPriv->screen->memory_size);
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}
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#else
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#define KdOffscreenValidate(s)
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#endif
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static KdOffscreenArea *
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KdOffscreenKickOut (ScreenPtr pScreen, KdOffscreenArea *area)
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{
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if (area->save)
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(*area->save) (pScreen, area);
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return KdOffscreenFree (pScreen, area);
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}
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KdOffscreenArea *
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KdOffscreenAlloc (ScreenPtr pScreen, int size, int align,
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Bool locked,
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KdOffscreenSaveProc save,
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pointer privData)
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{
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KdOffscreenArea *area, *begin, *best;
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KdScreenPriv (pScreen);
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int tmp, real_size = 0, best_score;
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KdOffscreenValidate (pScreen);
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if (!align)
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align = 1;
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if (!size)
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{
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DBG_OFFSCREEN (("Alloc 0x%x -> EMPTY\n", size));
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return NULL;
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}
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/* throw out requests that cannot fit */
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if (size > (pScreenPriv->screen->memory_size - pScreenPriv->screen->off_screen_base))
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{
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DBG_OFFSCREEN (("Alloc 0x%x -> TOBIG\n", size));
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return NULL;
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}
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/* Try to find a free space that'll fit. */
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for (area = pScreenPriv->off_screen_areas; area; area = area->next)
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{
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/* skip allocated areas */
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if (area->state != KdOffscreenAvail)
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continue;
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/* adjust size to match alignment requirement */
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real_size = size;
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tmp = area->offset % align;
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if (tmp)
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real_size += (align - tmp);
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/* does it fit? */
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if (real_size <= area->size)
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break;
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}
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if (!area)
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{
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/*
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* Kick out existing users to make space.
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*
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* First, locate a region which can hold the desired object.
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*/
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/* prev points at the first object to boot */
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best = NULL;
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best_score = MAXINT;
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for (begin = pScreenPriv->off_screen_areas; begin != NULL;
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begin = begin->next)
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{
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int avail, score;
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KdOffscreenArea *scan;
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if (begin->state == KdOffscreenLocked)
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continue;
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/* adjust size to match alignment requirement */
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real_size = size;
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tmp = begin->offset % align;
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if (tmp)
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real_size += (align - tmp);
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avail = 0;
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score = 0;
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/* now see if we can make room here, and how "costly" it'll be. */
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for (scan = begin; scan != NULL; scan = scan->next)
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{
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if (scan->state == KdOffscreenLocked) {
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/* Can't make room here, start after this locked area. */
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begin = scan->next;
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break;
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}
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/* Score should only be non-zero for KdOffscreenRemovable */
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score += scan->score;
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avail += scan->size;
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if (avail >= real_size)
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break;
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}
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/* Is it the best option we've found so far? */
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if (avail >= real_size && score < best_score) {
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best = begin;
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best_score = score;
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}
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}
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area = best;
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if (!area)
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{
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DBG_OFFSCREEN (("Alloc 0x%x -> NOSPACE\n", size));
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/* Could not allocate memory */
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KdOffscreenValidate (pScreen);
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return NULL;
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}
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/* adjust size to match alignment requirement */
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real_size = size;
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tmp = begin->offset % align;
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if (tmp)
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real_size += (align - tmp);
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/*
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* Kick out first area if in use
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*/
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if (area->state != KdOffscreenAvail)
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area = KdOffscreenKickOut (pScreen, area);
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/*
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* Now get the system to merge the other needed areas together
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*/
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while (area->size < real_size)
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{
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assert (area->next && area->next->state == KdOffscreenRemovable);
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(void) KdOffscreenKickOut (pScreen, area->next);
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}
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}
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/* save extra space in new area */
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if (real_size < area->size)
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{
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KdOffscreenArea *new_area = xalloc (sizeof (KdOffscreenArea));
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if (!new_area)
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return NULL;
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new_area->offset = area->offset + real_size;
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new_area->size = area->size - real_size;
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new_area->state = KdOffscreenAvail;
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new_area->save = 0;
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new_area->score = 0;
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new_area->next = area->next;
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area->next = new_area;
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area->size = real_size;
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}
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/*
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* Mark this area as in use
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*/
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if (locked)
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area->state = KdOffscreenLocked;
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else
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area->state = KdOffscreenRemovable;
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area->privData = privData;
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area->save = save;
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area->score = 0;
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area->save_offset = area->offset;
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{
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int tmp = area->offset % align;
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if (tmp)
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area->offset += (align - tmp);
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}
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KdOffscreenValidate (pScreen);
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DBG_OFFSCREEN (("Alloc 0x%x -> 0x%x\n", size, area->offset));
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return area;
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}
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void
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KdOffscreenSwapOut (ScreenPtr pScreen)
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{
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KdScreenPriv (pScreen);
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KdOffscreenValidate (pScreen);
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/* loop until a single free area spans the space */
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for (;;)
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{
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KdOffscreenArea *area = pScreenPriv->off_screen_areas;
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if (!area)
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break;
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if (area->state == KdOffscreenAvail)
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{
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area = area->next;
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if (!area)
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break;
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}
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assert (area->state != KdOffscreenAvail);
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(void) KdOffscreenKickOut (pScreen, area);
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KdOffscreenValidate (pScreen);
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}
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KdOffscreenValidate (pScreen);
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KdOffscreenFini (pScreen);
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}
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void
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KdOffscreenSwapIn (ScreenPtr pScreen)
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{
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KdOffscreenInit (pScreen);
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}
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/* merge the next free area into this one */
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static void
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KdOffscreenMerge (KdOffscreenArea *area)
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{
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KdOffscreenArea *next = area->next;
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/* account for space */
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area->size += next->size;
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/* frob pointer */
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area->next = next->next;
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xfree (next);
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}
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KdOffscreenArea *
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KdOffscreenFree (ScreenPtr pScreen, KdOffscreenArea *area)
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{
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KdScreenPriv(pScreen);
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KdOffscreenArea *next = area->next;
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KdOffscreenArea *prev;
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DBG_OFFSCREEN (("Free 0x%x -> 0x%x\n", area->size, area->offset));
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KdOffscreenValidate (pScreen);
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area->state = KdOffscreenAvail;
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area->save = 0;
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area->offset = area->save_offset;
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area->score = 0;
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/*
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* Find previous area
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*/
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if (area == pScreenPriv->off_screen_areas)
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prev = 0;
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else
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for (prev = pScreenPriv->off_screen_areas; prev; prev = prev->next)
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if (prev->next == area)
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break;
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/* link with next area if free */
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if (next && next->state == KdOffscreenAvail)
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KdOffscreenMerge (area);
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/* link with prev area if free */
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if (prev && prev->state == KdOffscreenAvail)
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{
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area = prev;
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KdOffscreenMerge (area);
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}
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KdOffscreenValidate (pScreen);
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return area;
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}
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void
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KdOffscreenMarkUsed (PixmapPtr pPixmap)
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{
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KaaPixmapPriv (pPixmap);
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KdScreenPriv (pPixmap->drawable.pScreen);
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static int iter = 0;
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if (!pKaaPixmap->area)
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return;
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/* The numbers here are arbitrary. We may want to tune these. */
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pKaaPixmap->area->score += 100;
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if (++iter == 10) {
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KdOffscreenArea *area;
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for (area = pScreenPriv->off_screen_areas; area != NULL;
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area = area->next)
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{
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if (area->state == KdOffscreenRemovable)
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area->score = (area->score * 7) / 8;
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}
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}
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}
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Bool
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KdOffscreenInit (ScreenPtr pScreen)
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{
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KdScreenPriv (pScreen);
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KdOffscreenArea *area;
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/* Allocate a big free area */
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area = xalloc (sizeof (KdOffscreenArea));
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if (!area)
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return FALSE;
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area->state = KdOffscreenAvail;
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area->offset = pScreenPriv->screen->off_screen_base;
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area->size = pScreenPriv->screen->memory_size - area->offset;
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area->save = 0;
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area->next = NULL;
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area->score = 0;
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/* Add it to the free areas */
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pScreenPriv->off_screen_areas = area;
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KdOffscreenValidate (pScreen);
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return TRUE;
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}
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void
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KdOffscreenFini (ScreenPtr pScreen)
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{
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KdScreenPriv (pScreen);
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KdOffscreenArea *area;
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/* just free all of the area records */
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while ((area = pScreenPriv->off_screen_areas))
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{
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pScreenPriv->off_screen_areas = area->next;
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xfree (area);
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}
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}
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