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xrdp-proprietary/uirdesktop/cache.c

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