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433 lines
9.1 KiB
433 lines
9.1 KiB
/* -*- c-basic-offset: 8 -*-
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rdesktop: A Remote Desktop Protocol client.
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Cache routines
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Copyright (C) Matthew Chapman 1999-2005
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Copyright (C) Jeroen Meijer 2005
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "rdesktop.h"
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/* BITMAP CACHE */
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extern int g_pstcache_fd[];
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#define NUM_ELEMENTS(array) (sizeof(array) / sizeof(array[0]))
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#define IS_PERSISTENT(id) (g_pstcache_fd[id] > 0)
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#define TO_TOP -1
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#define NOT_SET -1
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#define IS_SET(idx) (idx >= 0)
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/*
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* TODO: Test for optimal value of BUMP_COUNT. TO_TOP gives lowest cpu utilisation but using
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* a positive value will hopefully result in less frequently used bitmaps having a greater chance
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* of being evicted from the cache, and therby reducing the need to load bitmaps from disk.
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* (Jeroen)
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*/
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#define BUMP_COUNT 40
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struct bmpcache_entry
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{
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RD_HBITMAP bitmap;
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sint16 previous;
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sint16 next;
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};
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static struct bmpcache_entry g_bmpcache[3][0xa00];
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static RD_HBITMAP g_volatile_bc[3];
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static int g_bmpcache_lru[3] = { NOT_SET, NOT_SET, NOT_SET };
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static int g_bmpcache_mru[3] = { NOT_SET, NOT_SET, NOT_SET };
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static int g_bmpcache_count[3];
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/* Setup the bitmap cache lru/mru linked list */
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void
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cache_rebuild_bmpcache_linked_list(uint8 id, sint16 * idx, int count)
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{
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int n = count, c = 0;
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sint16 n_idx;
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/* find top, skip evicted bitmaps */
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while (--n >= 0 && g_bmpcache[id][idx[n]].bitmap == NULL);
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if (n < 0)
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{
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g_bmpcache_mru[id] = g_bmpcache_lru[id] = NOT_SET;
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return;
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}
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g_bmpcache_mru[id] = idx[n];
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g_bmpcache[id][idx[n]].next = NOT_SET;
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n_idx = idx[n];
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c++;
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/* link list */
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while (n >= 0)
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{
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/* skip evicted bitmaps */
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while (--n >= 0 && g_bmpcache[id][idx[n]].bitmap == NULL);
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if (n < 0)
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break;
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g_bmpcache[id][n_idx].previous = idx[n];
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g_bmpcache[id][idx[n]].next = n_idx;
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n_idx = idx[n];
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c++;
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}
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g_bmpcache[id][n_idx].previous = NOT_SET;
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g_bmpcache_lru[id] = n_idx;
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if (c != g_bmpcache_count[id])
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{
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error("Oops. %d in bitmap cache linked list, %d in ui cache...\n", c,
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g_bmpcache_count[id]);
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exit(1);
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}
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}
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/* Move a bitmap to a new position in the linked list. */
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void
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cache_bump_bitmap(uint8 id, uint16 idx, int bump)
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{
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int p_idx, n_idx, n;
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if (!IS_PERSISTENT(id))
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return;
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if (g_bmpcache_mru[id] == idx)
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return;
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DEBUG_RDP5(("bump bitmap: id=%d, idx=%d, bump=%d\n", id, idx, bump));
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n_idx = g_bmpcache[id][idx].next;
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p_idx = g_bmpcache[id][idx].previous;
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if (IS_SET(n_idx))
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{
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/* remove */
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--g_bmpcache_count[id];
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if (IS_SET(p_idx))
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g_bmpcache[id][p_idx].next = n_idx;
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else
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g_bmpcache_lru[id] = n_idx;
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if (IS_SET(n_idx))
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g_bmpcache[id][n_idx].previous = p_idx;
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else
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g_bmpcache_mru[id] = p_idx;
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}
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else
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{
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p_idx = NOT_SET;
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n_idx = g_bmpcache_lru[id];
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}
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if (bump >= 0)
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{
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for (n = 0; n < bump && IS_SET(n_idx); n++)
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{
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p_idx = n_idx;
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n_idx = g_bmpcache[id][p_idx].next;
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}
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}
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else
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{
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p_idx = g_bmpcache_mru[id];
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n_idx = NOT_SET;
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}
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/* insert */
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++g_bmpcache_count[id];
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g_bmpcache[id][idx].previous = p_idx;
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g_bmpcache[id][idx].next = n_idx;
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if (p_idx >= 0)
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g_bmpcache[id][p_idx].next = idx;
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else
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g_bmpcache_lru[id] = idx;
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if (n_idx >= 0)
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g_bmpcache[id][n_idx].previous = idx;
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else
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g_bmpcache_mru[id] = idx;
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}
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/* Evict the least-recently used bitmap from the cache */
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void
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cache_evict_bitmap(uint8 id)
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{
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uint16 idx;
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int n_idx;
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if (!IS_PERSISTENT(id))
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return;
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idx = g_bmpcache_lru[id];
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n_idx = g_bmpcache[id][idx].next;
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DEBUG_RDP5(("evict bitmap: id=%d idx=%d n_idx=%d bmp=0x%x\n", id, idx, n_idx,
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g_bmpcache[id][idx].bitmap));
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ui_destroy_bitmap(g_bmpcache[id][idx].bitmap);
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--g_bmpcache_count[id];
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g_bmpcache[id][idx].bitmap = 0;
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g_bmpcache_lru[id] = n_idx;
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g_bmpcache[id][n_idx].previous = NOT_SET;
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pstcache_touch_bitmap(id, idx, 0);
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}
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/* Retrieve a bitmap from the cache */
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RD_HBITMAP
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cache_get_bitmap(uint8 id, uint16 idx)
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{
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if ((id < NUM_ELEMENTS(g_bmpcache)) && (idx < NUM_ELEMENTS(g_bmpcache[0])))
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{
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if (g_bmpcache[id][idx].bitmap || pstcache_load_bitmap(id, idx))
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{
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if (IS_PERSISTENT(id))
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cache_bump_bitmap(id, idx, BUMP_COUNT);
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return g_bmpcache[id][idx].bitmap;
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}
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}
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else if ((id < NUM_ELEMENTS(g_volatile_bc)) && (idx == 0x7fff))
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{
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return g_volatile_bc[id];
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}
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error("get bitmap %d:%d\n", id, idx);
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return NULL;
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}
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/* Store a bitmap in the cache */
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void
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cache_put_bitmap(uint8 id, uint16 idx, RD_HBITMAP bitmap)
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{
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RD_HBITMAP old;
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if ((id < NUM_ELEMENTS(g_bmpcache)) && (idx < NUM_ELEMENTS(g_bmpcache[0])))
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{
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old = g_bmpcache[id][idx].bitmap;
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if (old != NULL)
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ui_destroy_bitmap(old);
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g_bmpcache[id][idx].bitmap = bitmap;
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if (IS_PERSISTENT(id))
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{
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if (old == NULL)
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g_bmpcache[id][idx].previous = g_bmpcache[id][idx].next = NOT_SET;
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cache_bump_bitmap(id, idx, TO_TOP);
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if (g_bmpcache_count[id] > BMPCACHE2_C2_CELLS)
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cache_evict_bitmap(id);
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}
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}
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else if ((id < NUM_ELEMENTS(g_volatile_bc)) && (idx == 0x7fff))
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{
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old = g_volatile_bc[id];
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if (old != NULL)
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ui_destroy_bitmap(old);
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g_volatile_bc[id] = bitmap;
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}
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else
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{
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error("put bitmap %d:%d\n", id, idx);
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}
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}
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/* Updates the persistent bitmap cache MRU information on exit */
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void
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cache_save_state(void)
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{
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uint32 id = 0, t = 0;
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int idx;
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for (id = 0; id < NUM_ELEMENTS(g_bmpcache); id++)
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if (IS_PERSISTENT(id))
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{
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DEBUG_RDP5(("Saving cache state for bitmap cache %d...", id));
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idx = g_bmpcache_lru[id];
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while (idx >= 0)
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{
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pstcache_touch_bitmap((uint8) id, (uint16) idx, ++t);
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idx = g_bmpcache[id][idx].next;
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}
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DEBUG_RDP5((" %d stamps written.\n", t));
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}
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}
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/* FONT CACHE */
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static FONTGLYPH g_fontcache[12][256];
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/* Retrieve a glyph from the font cache */
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FONTGLYPH *
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cache_get_font(uint8 font, uint16 character)
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{
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FONTGLYPH *glyph;
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if ((font < NUM_ELEMENTS(g_fontcache)) && (character < NUM_ELEMENTS(g_fontcache[0])))
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{
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glyph = &g_fontcache[font][character];
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if (glyph->pixmap != NULL)
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return glyph;
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}
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error("get font %d:%d\n", font, character);
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return NULL;
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}
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/* Store a glyph in the font cache */
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void
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cache_put_font(uint8 font, uint16 character, uint16 offset,
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uint16 baseline, uint16 width, uint16 height, RD_HGLYPH pixmap)
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{
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FONTGLYPH *glyph;
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if ((font < NUM_ELEMENTS(g_fontcache)) && (character < NUM_ELEMENTS(g_fontcache[0])))
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{
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glyph = &g_fontcache[font][character];
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if (glyph->pixmap != NULL)
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ui_destroy_glyph(glyph->pixmap);
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glyph->offset = offset;
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glyph->baseline = baseline;
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glyph->width = width;
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glyph->height = height;
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glyph->pixmap = pixmap;
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}
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else
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{
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error("put font %d:%d\n", font, character);
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}
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}
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/* TEXT CACHE */
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static DATABLOB g_textcache[256];
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/* Retrieve a text item from the cache */
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DATABLOB *
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cache_get_text(uint8 cache_id)
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{
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DATABLOB *text;
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text = &g_textcache[cache_id];
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return text;
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}
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/* Store a text item in the cache */
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void
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cache_put_text(uint8 cache_id, void *data, int length)
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{
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DATABLOB *text;
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text = &g_textcache[cache_id];
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if (text->data != NULL)
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xfree(text->data);
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text->data = xmalloc(length);
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text->size = length;
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memcpy(text->data, data, length);
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}
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/* DESKTOP CACHE */
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static uint8 g_deskcache[0x38400 * 4];
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/* Retrieve desktop data from the cache */
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uint8 *
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cache_get_desktop(uint32 offset, int cx, int cy, int bytes_per_pixel)
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{
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int length = cx * cy * bytes_per_pixel;
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if (offset > sizeof(g_deskcache))
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offset = 0;
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if ((offset + length) <= sizeof(g_deskcache))
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{
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return &g_deskcache[offset];
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}
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error("get desktop %d:%d\n", offset, length);
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return NULL;
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}
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/* Store desktop data in the cache */
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void
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cache_put_desktop(uint32 offset, int cx, int cy, int scanline, int bytes_per_pixel, uint8 * data)
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{
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int length = cx * cy * bytes_per_pixel;
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if (offset > sizeof(g_deskcache))
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offset = 0;
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if ((offset + length) <= sizeof(g_deskcache))
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{
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cx *= bytes_per_pixel;
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while (cy--)
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{
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memcpy(&g_deskcache[offset], data, cx);
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data += scanline;
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offset += cx;
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}
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}
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else
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{
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error("put desktop %d:%d\n", offset, length);
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}
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}
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/* CURSOR CACHE */
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static RD_HCURSOR g_cursorcache[0x20];
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/* Retrieve cursor from cache */
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RD_HCURSOR
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cache_get_cursor(uint16 cache_idx)
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{
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RD_HCURSOR cursor;
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if (cache_idx < NUM_ELEMENTS(g_cursorcache))
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{
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cursor = g_cursorcache[cache_idx];
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if (cursor != NULL)
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return cursor;
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}
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error("get cursor %d\n", cache_idx);
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return NULL;
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}
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/* Store cursor in cache */
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void
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cache_put_cursor(uint16 cache_idx, RD_HCURSOR cursor)
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{
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RD_HCURSOR old;
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if (cache_idx < NUM_ELEMENTS(g_cursorcache))
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{
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old = g_cursorcache[cache_idx];
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if (old != NULL)
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ui_destroy_cursor(old);
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g_cursorcache[cache_idx] = cursor;
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}
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else
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{
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error("put cursor %d\n", cache_idx);
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}
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}
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