cache.c@ 32472

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1	/* -- c-basic-offset: 8 --
2	rdesktop: A Remote Desktop Protocol client.
3	Cache routines
4	Copyright (C) Matthew Chapman 1999-2007
5	Copyright (C) Jeroen Meijer 2005
6
7	This program is free software; you can redistribute it and/or modify
8	it under the terms of the GNU General Public License as published by
9	the Free Software Foundation; either version 2 of the License, or
10	(at your option) any later version.
11
12	This program is distributed in the hope that it will be useful,
13	but WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	GNU General Public License for more details.
16
17	You should have received a copy of the GNU General Public License
18	along with this program; if not, write to the Free Software
19	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20	*/
21
22	/*
23	* Sun GPL Disclaimer: For the avoidance of doubt, except that if any license choice
24	* other than GPL or LGPL is available it will apply instead, Sun elects to use only
25	* the General Public License version 2 (GPLv2) at this time for any software where
26	* a choice of GPL license versions is made available with the language indicating
27	* that GPLv2 or any later version may be used, or where a choice of which version
28	* of the GPL is applied is otherwise unspecified.
29	*/
30
31	#include "rdesktop.h"
32
33	/* BITMAP CACHE */
34	extern int g_pstcache_fd[];
35
36	#define NUM_ELEMENTS(array) (sizeof(array) / sizeof(array[0]))
37	#define IS_PERSISTENT(id) (g_pstcache_fd[id] > 0)
38	#define TO_TOP -1
39	#define NOT_SET -1
40	#define IS_SET(idx) (idx >= 0)
41
42	/*
43	* TODO: Test for optimal value of BUMP_COUNT. TO_TOP gives lowest cpu utilisation but using
44	* a positive value will hopefully result in less frequently used bitmaps having a greater chance
45	* of being evicted from the cache, and therby reducing the need to load bitmaps from disk.
46	* (Jeroen)
47	*/
48	#define BUMP_COUNT 40
49
50	struct bmpcache_entry
51	{
52	RD_HBITMAP bitmap;
53	sint16 previous;
54	sint16 next;
55	};
56
57	static struct bmpcache_entry g_bmpcache[3][0xa00];
58	static RD_HBITMAP g_volatile_bc[3];
59
60	static int g_bmpcache_lru[3] = { NOT_SET, NOT_SET, NOT_SET };
61	static int g_bmpcache_mru[3] = { NOT_SET, NOT_SET, NOT_SET };
62	static int g_bmpcache_count[3];
63
64	/* Setup the bitmap cache lru/mru linked list */
65	void
66	cache_rebuild_bmpcache_linked_list(uint8 id, sint16 * idx, int count)
67	{
68	int n = count, c = 0;
69	sint16 n_idx;
70
71	/* find top, skip evicted bitmaps */
72	while (--n >= 0 && g_bmpcache[id][idx[n]].bitmap == NULL);
73	if (n < 0)
74	{
75	g_bmpcache_mru[id] = g_bmpcache_lru[id] = NOT_SET;
76	return;
77	}
78
79	g_bmpcache_mru[id] = idx[n];
80	g_bmpcache[id][idx[n]].next = NOT_SET;
81	n_idx = idx[n];
82	c++;
83
84	/* link list */
85	while (n >= 0)
86	{
87	/* skip evicted bitmaps */
88	while (--n >= 0 && g_bmpcache[id][idx[n]].bitmap == NULL);
89
90	if (n < 0)
91	break;
92
93	g_bmpcache[id][n_idx].previous = idx[n];
94	g_bmpcache[id][idx[n]].next = n_idx;
95	n_idx = idx[n];
96	c++;
97	}
98
99	g_bmpcache[id][n_idx].previous = NOT_SET;
100	g_bmpcache_lru[id] = n_idx;
101
102	if (c != g_bmpcache_count[id])
103	{
104	error("Oops. %d in bitmap cache linked list, %d in ui cache...\n", c,
105	g_bmpcache_count[id]);
106	exit(1);
107	}
108	}
109
110	/* Move a bitmap to a new position in the linked list. */
111	void
112	cache_bump_bitmap(uint8 id, uint16 idx, int bump)
113	{
114	int p_idx, n_idx, n;
115
116	if (!IS_PERSISTENT(id))
117	return;
118
119	if (g_bmpcache_mru[id] == idx)
120	return;
121
122	DEBUG_RDP5(("bump bitmap: id=%d, idx=%d, bump=%d\n", id, idx, bump));
123
124	n_idx = g_bmpcache[id][idx].next;
125	p_idx = g_bmpcache[id][idx].previous;
126
127	if (IS_SET(n_idx))
128	{
129	/* remove */
130	--g_bmpcache_count[id];
131	if (IS_SET(p_idx))
132	g_bmpcache[id][p_idx].next = n_idx;
133	else
134	g_bmpcache_lru[id] = n_idx;
135	if (IS_SET(n_idx))
136	g_bmpcache[id][n_idx].previous = p_idx;
137	else
138	g_bmpcache_mru[id] = p_idx;
139	}
140	else
141	{
142	p_idx = NOT_SET;
143	n_idx = g_bmpcache_lru[id];
144	}
145
146	if (bump >= 0)
147	{
148	for (n = 0; n < bump && IS_SET(n_idx); n++)
149	{
150	p_idx = n_idx;
151	n_idx = g_bmpcache[id][p_idx].next;
152	}
153	}
154	else
155	{
156	p_idx = g_bmpcache_mru[id];
157	n_idx = NOT_SET;
158	}
159
160	/* insert */
161	++g_bmpcache_count[id];
162	g_bmpcache[id][idx].previous = p_idx;
163	g_bmpcache[id][idx].next = n_idx;
164
165	if (p_idx >= 0)
166	g_bmpcache[id][p_idx].next = idx;
167	else
168	g_bmpcache_lru[id] = idx;
169
170	if (n_idx >= 0)
171	g_bmpcache[id][n_idx].previous = idx;
172	else
173	g_bmpcache_mru[id] = idx;
174	}
175
176	/* Evict the least-recently used bitmap from the cache */
177	void
178	cache_evict_bitmap(uint8 id)
179	{
180	uint16 idx;
181	int n_idx;
182
183	if (!IS_PERSISTENT(id))
184	return;
185
186	idx = g_bmpcache_lru[id];
187	n_idx = g_bmpcache[id][idx].next;
188	DEBUG_RDP5(("evict bitmap: id=%d idx=%d n_idx=%d bmp=0x%x\n", id, idx, n_idx,
189	g_bmpcache[id][idx].bitmap));
190
191	ui_destroy_bitmap(g_bmpcache[id][idx].bitmap);
192	--g_bmpcache_count[id];
193	g_bmpcache[id][idx].bitmap = 0;
194
195	g_bmpcache_lru[id] = n_idx;
196	g_bmpcache[id][n_idx].previous = NOT_SET;
197
198	pstcache_touch_bitmap(id, idx, 0);
199	}
200
201	/* Retrieve a bitmap from the cache */
202	RD_HBITMAP
203	cache_get_bitmap(uint8 id, uint16 idx)
204	{
205	if ((id < NUM_ELEMENTS(g_bmpcache)) && (idx < NUM_ELEMENTS(g_bmpcache[0])))
206	{
207	if (g_bmpcache[id][idx].bitmap \|\| pstcache_load_bitmap(id, idx))
208	{
209	if (IS_PERSISTENT(id))
210	cache_bump_bitmap(id, idx, BUMP_COUNT);
211
212	return g_bmpcache[id][idx].bitmap;
213	}
214	}
215	else if ((id < NUM_ELEMENTS(g_volatile_bc)) && (idx == 0x7fff))
216	{
217	return g_volatile_bc[id];
218	}
219
220	error("get bitmap %d:%d\n", id, idx);
221	return NULL;
222	}
223
224	/* Store a bitmap in the cache */
225	void
226	cache_put_bitmap(uint8 id, uint16 idx, RD_HBITMAP bitmap)
227	{
228	RD_HBITMAP old;
229
230	if ((id < NUM_ELEMENTS(g_bmpcache)) && (idx < NUM_ELEMENTS(g_bmpcache[0])))
231	{
232	old = g_bmpcache[id][idx].bitmap;
233	if (old != NULL)
234	ui_destroy_bitmap(old);
235	g_bmpcache[id][idx].bitmap = bitmap;
236
237	if (IS_PERSISTENT(id))
238	{
239	if (old == NULL)
240	g_bmpcache[id][idx].previous = g_bmpcache[id][idx].next = NOT_SET;
241
242	cache_bump_bitmap(id, idx, TO_TOP);
243	if (g_bmpcache_count[id] > BMPCACHE2_C2_CELLS)
244	cache_evict_bitmap(id);
245	}
246	}
247	else if ((id < NUM_ELEMENTS(g_volatile_bc)) && (idx == 0x7fff))
248	{
249	old = g_volatile_bc[id];
250	if (old != NULL)
251	ui_destroy_bitmap(old);
252	g_volatile_bc[id] = bitmap;
253	}
254	else
255	{
256	error("put bitmap %d:%d\n", id, idx);
257	}
258	}
259
260	/* Updates the persistent bitmap cache MRU information on exit */
261	void
262	cache_save_state(void)
263	{
264	uint32 id = 0, t = 0;
265	int idx;
266
267	for (id = 0; id < NUM_ELEMENTS(g_bmpcache); id++)
268	if (IS_PERSISTENT(id))
269	{
270	DEBUG_RDP5(("Saving cache state for bitmap cache %d...", id));
271	idx = g_bmpcache_lru[id];
272	while (idx >= 0)
273	{
274	pstcache_touch_bitmap(id, idx, ++t);
275	idx = g_bmpcache[id][idx].next;
276	}
277	DEBUG_RDP5((" %d stamps written.\n", t));
278	}
279	}
280
281
282	/* FONT CACHE */
283	static FONTGLYPH g_fontcache[12][256];
284
285	/* Retrieve a glyph from the font cache */
286	FONTGLYPH *
287	cache_get_font(uint8 font, uint16 character)
288	{
289	FONTGLYPH *glyph;
290
291	if ((font < NUM_ELEMENTS(g_fontcache)) && (character < NUM_ELEMENTS(g_fontcache[0])))
292	{
293	glyph = &g_fontcache[font][character];
294	if (glyph->pixmap != NULL)
295	return glyph;
296	}
297
298	error("get font %d:%d\n", font, character);
299	return NULL;
300	}
301
302	/* Store a glyph in the font cache */
303	void
304	cache_put_font(uint8 font, uint16 character, uint16 offset,
305	uint16 baseline, uint16 width, uint16 height, RD_HGLYPH pixmap)
306	{
307	FONTGLYPH *glyph;
308
309	if ((font < NUM_ELEMENTS(g_fontcache)) && (character < NUM_ELEMENTS(g_fontcache[0])))
310	{
311	glyph = &g_fontcache[font][character];
312	if (glyph->pixmap != NULL)
313	ui_destroy_glyph(glyph->pixmap);
314
315	glyph->offset = offset;
316	glyph->baseline = baseline;
317	glyph->width = width;
318	glyph->height = height;
319	glyph->pixmap = pixmap;
320	}
321	else
322	{
323	error("put font %d:%d\n", font, character);
324	}
325	}
326
327
328	/* TEXT CACHE */
329	static DATABLOB g_textcache[256];
330
331	/* Retrieve a text item from the cache */
332	DATABLOB *
333	cache_get_text(uint8 cache_id)
334	{
335	DATABLOB *text;
336
337	text = &g_textcache[cache_id];
338	return text;
339	}
340
341	/* Store a text item in the cache */
342	void
343	cache_put_text(uint8 cache_id, void *data, int length)
344	{
345	DATABLOB *text;
346
347	text = &g_textcache[cache_id];
348	if (text->data != NULL)
349	xfree(text->data);
350	text->data = xmalloc(length);
351	text->size = length;
352	memcpy(text->data, data, length);
353	}
354
355
356	/* DESKTOP CACHE */
357	static uint8 g_deskcache[0x38400 * 4];
358
359	/* Retrieve desktop data from the cache */
360	uint8 *
361	cache_get_desktop(uint32 offset, int cx, int cy, int bytes_per_pixel)
362	{
363	int length = cx * cy * bytes_per_pixel;
364
365	if (offset > sizeof(g_deskcache))
366	offset = 0;
367
368	if ((offset + length) <= sizeof(g_deskcache))
369	{
370	return &g_deskcache[offset];
371	}
372
373	error("get desktop %d:%d\n", offset, length);
374	return NULL;
375	}
376
377	/* Store desktop data in the cache */
378	void
379	cache_put_desktop(uint32 offset, int cx, int cy, int scanline, int bytes_per_pixel, uint8 * data)
380	{
381	int length = cx * cy * bytes_per_pixel;
382
383	if (offset > sizeof(g_deskcache))
384	offset = 0;
385
386	if ((offset + length) <= sizeof(g_deskcache))
387	{
388	cx *= bytes_per_pixel;
389	while (cy--)
390	{
391	memcpy(&g_deskcache[offset], data, cx);
392	data += scanline;
393	offset += cx;
394	}
395	}
396	else
397	{
398	error("put desktop %d:%d\n", offset, length);
399	}
400	}
401
402
403	/* CURSOR CACHE */
404	static RD_HCURSOR g_cursorcache[0x20];
405
406	/* Retrieve cursor from cache */
407	RD_HCURSOR
408	cache_get_cursor(uint16 cache_idx)
409	{
410	RD_HCURSOR cursor;
411
412	if (cache_idx < NUM_ELEMENTS(g_cursorcache))
413	{
414	cursor = g_cursorcache[cache_idx];
415	if (cursor != NULL)
416	return cursor;
417	}
418
419	error("get cursor %d\n", cache_idx);
420	return NULL;
421	}
422
423	/* Store cursor in cache */
424	void
425	cache_put_cursor(uint16 cache_idx, RD_HCURSOR cursor)
426	{
427	RD_HCURSOR old;
428
429	if (cache_idx < NUM_ELEMENTS(g_cursorcache))
430	{
431	old = g_cursorcache[cache_idx];
432	if (old != NULL)
433	ui_destroy_cursor(old);
434
435	g_cursorcache[cache_idx] = cursor;
436	}
437	else
438	{
439	error("put cursor %d\n", cache_idx);
440	}
441	}

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source: vbox/trunk/src/VBox/RDP/client/cache.c@ 32472

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