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380282b0 CC |
1 | /* |
2 | * QEMU VNC display driver: tight encoding | |
3 | * | |
4 | * From libvncserver/libvncserver/tight.c | |
5 | * Copyright (C) 2000, 2001 Const Kaplinsky. All Rights Reserved. | |
6 | * Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved. | |
7 | * | |
8 | * Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com> | |
9 | * | |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this software and associated documentation files (the "Software"), to deal | |
12 | * in the Software without restriction, including without limitation the rights | |
13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
14 | * copies of the Software, and to permit persons to whom the Software is | |
15 | * furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
26 | * THE SOFTWARE. | |
27 | */ | |
28 | ||
aa7d73fd CC |
29 | #include "qdict.h" |
30 | #include "qint.h" | |
380282b0 CC |
31 | #include "vnc.h" |
32 | #include "vnc-encoding-tight.h" | |
33 | ||
34 | /* Compression level stuff. The following array contains various | |
35 | encoder parameters for each of 10 compression levels (0..9). | |
36 | Last three parameters correspond to JPEG quality levels (0..9). */ | |
37 | ||
38 | static const struct { | |
39 | int max_rect_size, max_rect_width; | |
40 | int mono_min_rect_size, gradient_min_rect_size; | |
41 | int idx_zlib_level, mono_zlib_level, raw_zlib_level, gradient_zlib_level; | |
42 | int gradient_threshold, gradient_threshold24; | |
43 | int idx_max_colors_divisor; | |
44 | int jpeg_quality, jpeg_threshold, jpeg_threshold24; | |
45 | } tight_conf[] = { | |
46 | { 512, 32, 6, 65536, 0, 0, 0, 0, 0, 0, 4, 5, 10000, 23000 }, | |
47 | { 2048, 128, 6, 65536, 1, 1, 1, 0, 0, 0, 8, 10, 8000, 18000 }, | |
48 | { 6144, 256, 8, 65536, 3, 3, 2, 0, 0, 0, 24, 15, 6500, 15000 }, | |
49 | { 10240, 1024, 12, 65536, 5, 5, 3, 0, 0, 0, 32, 25, 5000, 12000 }, | |
50 | { 16384, 2048, 12, 65536, 6, 6, 4, 0, 0, 0, 32, 37, 4000, 10000 }, | |
51 | { 32768, 2048, 12, 4096, 7, 7, 5, 4, 150, 380, 32, 50, 3000, 8000 }, | |
52 | { 65536, 2048, 16, 4096, 7, 7, 6, 4, 170, 420, 48, 60, 2000, 5000 }, | |
53 | { 65536, 2048, 16, 4096, 8, 8, 7, 5, 180, 450, 64, 70, 1000, 2500 }, | |
54 | { 65536, 2048, 32, 8192, 9, 9, 8, 6, 190, 475, 64, 75, 500, 1200 }, | |
55 | { 65536, 2048, 32, 8192, 9, 9, 9, 6, 200, 500, 96, 80, 200, 500 } | |
56 | }; | |
57 | ||
aa7d73fd CC |
58 | /* |
59 | * Code to determine how many different colors used in rectangle. | |
60 | */ | |
61 | ||
62 | static void tight_palette_rgb2buf(uint32_t rgb, int bpp, uint8_t buf[6]) | |
63 | { | |
64 | memset(buf, 0, 6); | |
65 | ||
66 | if (bpp == 32) { | |
67 | buf[0] = ((rgb >> 24) & 0xFF); | |
68 | buf[1] = ((rgb >> 16) & 0xFF); | |
69 | buf[2] = ((rgb >> 8) & 0xFF); | |
70 | buf[3] = ((rgb >> 0) & 0xFF); | |
71 | buf[4] = ((buf[0] & 1) == 0) << 3 | ((buf[1] & 1) == 0) << 2; | |
72 | buf[4]|= ((buf[2] & 1) == 0) << 1 | ((buf[3] & 1) == 0) << 0; | |
73 | buf[0] |= 1; | |
74 | buf[1] |= 1; | |
75 | buf[2] |= 1; | |
76 | buf[3] |= 1; | |
77 | } | |
78 | if (bpp == 16) { | |
79 | buf[0] = ((rgb >> 8) & 0xFF); | |
80 | buf[1] = ((rgb >> 0) & 0xFF); | |
81 | buf[2] = ((buf[0] & 1) == 0) << 1 | ((buf[1] & 1) == 0) << 0; | |
82 | buf[0] |= 1; | |
83 | buf[1] |= 1; | |
84 | } | |
85 | } | |
86 | ||
87 | static uint32_t tight_palette_buf2rgb(int bpp, const uint8_t *buf) | |
88 | { | |
89 | uint32_t rgb = 0; | |
90 | ||
91 | if (bpp == 32) { | |
92 | rgb |= ((buf[0] & ~1) | !((buf[4] >> 3) & 1)) << 24; | |
93 | rgb |= ((buf[1] & ~1) | !((buf[4] >> 2) & 1)) << 16; | |
94 | rgb |= ((buf[2] & ~1) | !((buf[4] >> 1) & 1)) << 8; | |
95 | rgb |= ((buf[3] & ~1) | !((buf[4] >> 0) & 1)) << 0; | |
96 | } | |
97 | if (bpp == 16) { | |
98 | rgb |= ((buf[0] & ~1) | !((buf[2] >> 1) & 1)) << 8; | |
99 | rgb |= ((buf[1] & ~1) | !((buf[2] >> 0) & 1)) << 0; | |
100 | } | |
101 | return rgb; | |
102 | } | |
103 | ||
104 | ||
105 | static int tight_palette_insert(QDict *palette, uint32_t rgb, int bpp, int max) | |
106 | { | |
107 | uint8_t key[6]; | |
108 | int idx = qdict_size(palette); | |
109 | bool present; | |
110 | ||
111 | tight_palette_rgb2buf(rgb, bpp, key); | |
112 | present = qdict_haskey(palette, (char *)key); | |
113 | if (idx >= max && !present) { | |
114 | return 0; | |
115 | } | |
116 | if (!present) { | |
117 | qdict_put(palette, (char *)key, qint_from_int(idx)); | |
118 | } | |
119 | return qdict_size(palette); | |
120 | } | |
121 | ||
122 | #define DEFINE_FILL_PALETTE_FUNCTION(bpp) \ | |
123 | \ | |
124 | static int \ | |
125 | tight_fill_palette##bpp(VncState *vs, int x, int y, \ | |
126 | int max, size_t count, \ | |
127 | uint32_t *bg, uint32_t *fg, \ | |
128 | struct QDict **palette) { \ | |
129 | uint##bpp##_t *data; \ | |
130 | uint##bpp##_t c0, c1, ci; \ | |
131 | int i, n0, n1; \ | |
132 | \ | |
133 | data = (uint##bpp##_t *)vs->tight.buffer; \ | |
134 | \ | |
135 | c0 = data[0]; \ | |
136 | i = 1; \ | |
137 | while (i < count && data[i] == c0) \ | |
138 | i++; \ | |
139 | if (i >= count) { \ | |
140 | *bg = *fg = c0; \ | |
141 | return 1; \ | |
142 | } \ | |
143 | \ | |
144 | if (max < 2) { \ | |
145 | return 0; \ | |
146 | } \ | |
147 | \ | |
148 | n0 = i; \ | |
149 | c1 = data[i]; \ | |
150 | n1 = 0; \ | |
151 | for (i++; i < count; i++) { \ | |
152 | ci = data[i]; \ | |
153 | if (ci == c0) { \ | |
154 | n0++; \ | |
155 | } else if (ci == c1) { \ | |
156 | n1++; \ | |
157 | } else \ | |
158 | break; \ | |
159 | } \ | |
160 | if (i >= count) { \ | |
161 | if (n0 > n1) { \ | |
162 | *bg = (uint32_t)c0; \ | |
163 | *fg = (uint32_t)c1; \ | |
164 | } else { \ | |
165 | *bg = (uint32_t)c1; \ | |
166 | *fg = (uint32_t)c0; \ | |
167 | } \ | |
168 | return 2; \ | |
169 | } \ | |
170 | \ | |
171 | if (max == 2) { \ | |
172 | return 0; \ | |
173 | } \ | |
174 | \ | |
175 | *palette = qdict_new(); \ | |
176 | tight_palette_insert(*palette, c0, bpp, max); \ | |
177 | tight_palette_insert(*palette, c1, bpp, max); \ | |
270ec219 | 178 | tight_palette_insert(*palette, ci, bpp, max); \ |
aa7d73fd CC |
179 | \ |
180 | for (i++; i < count; i++) { \ | |
181 | if (data[i] == ci) { \ | |
182 | continue; \ | |
183 | } else { \ | |
184 | if (!tight_palette_insert(*palette, (uint32_t)ci, \ | |
185 | bpp, max)) { \ | |
186 | return 0; \ | |
187 | } \ | |
188 | ci = data[i]; \ | |
189 | } \ | |
190 | } \ | |
191 | \ | |
192 | return qdict_size(*palette); \ | |
193 | } | |
194 | ||
195 | DEFINE_FILL_PALETTE_FUNCTION(8) | |
196 | DEFINE_FILL_PALETTE_FUNCTION(16) | |
197 | DEFINE_FILL_PALETTE_FUNCTION(32) | |
198 | ||
199 | static int tight_fill_palette(VncState *vs, int x, int y, | |
200 | size_t count, uint32_t *bg, uint32_t *fg, | |
201 | struct QDict **palette) | |
202 | { | |
203 | int max; | |
204 | ||
205 | max = count / tight_conf[vs->tight_compression].idx_max_colors_divisor; | |
206 | if (max < 2 && | |
207 | count >= tight_conf[vs->tight_compression].mono_min_rect_size) { | |
208 | max = 2; | |
209 | } | |
210 | if (max >= 256) { | |
211 | max = 256; | |
212 | } | |
213 | ||
214 | switch(vs->clientds.pf.bytes_per_pixel) { | |
215 | case 4: | |
216 | return tight_fill_palette32(vs, x, y, max, count, bg, fg, palette); | |
217 | case 2: | |
218 | return tight_fill_palette16(vs, x, y, max, count, bg, fg, palette); | |
219 | default: | |
220 | max = 2; | |
221 | return tight_fill_palette8(vs, x, y, max, count, bg, fg, palette); | |
222 | } | |
223 | return 0; | |
224 | } | |
225 | ||
226 | /* Callback to dump a palette with qdict_iter | |
227 | static void print_palette(const char *key, QObject *obj, void *opaque) | |
228 | { | |
229 | uint8_t idx = qint_get_int(qobject_to_qint(obj)); | |
230 | uint32_t rgb = tight_palette_buf2rgb(32, (uint8_t *)key); | |
231 | ||
232 | fprintf(stderr, "%.2x ", (unsigned char)*key); | |
233 | while (*key++) | |
234 | fprintf(stderr, "%.2x ", (unsigned char)*key); | |
235 | ||
236 | fprintf(stderr, ": idx: %x rgb: %x\n", idx, rgb); | |
237 | } | |
238 | */ | |
239 | ||
240 | /* | |
241 | * Converting truecolor samples into palette indices. | |
242 | */ | |
243 | #define DEFINE_IDX_ENCODE_FUNCTION(bpp) \ | |
244 | \ | |
245 | static void \ | |
246 | tight_encode_indexed_rect##bpp(uint8_t *buf, int count, \ | |
247 | struct QDict *palette) { \ | |
248 | uint##bpp##_t *src; \ | |
249 | uint##bpp##_t rgb; \ | |
250 | uint8_t key[6]; \ | |
54d43eac | 251 | int i, rep; \ |
aa7d73fd CC |
252 | uint8_t idx; \ |
253 | \ | |
254 | src = (uint##bpp##_t *) buf; \ | |
255 | \ | |
54d43eac | 256 | for (i = 0; i < count; i++) { \ |
aa7d73fd CC |
257 | rgb = *src++; \ |
258 | rep = 0; \ | |
54d43eac CC |
259 | while (i < count && *src == rgb) { \ |
260 | rep++, src++, i++; \ | |
aa7d73fd CC |
261 | } \ |
262 | tight_palette_rgb2buf(rgb, bpp, key); \ | |
263 | if (!qdict_haskey(palette, (char *)key)) { \ | |
264 | /* \ | |
265 | * Should never happen, but don't break everything \ | |
266 | * if it does, use the first color instead \ | |
267 | */ \ | |
268 | idx = 0; \ | |
269 | } else { \ | |
270 | idx = qdict_get_int(palette, (char *)key); \ | |
271 | } \ | |
272 | while (rep >= 0) { \ | |
273 | *buf++ = idx; \ | |
274 | rep--; \ | |
275 | } \ | |
276 | } \ | |
277 | } | |
278 | ||
279 | DEFINE_IDX_ENCODE_FUNCTION(16) | |
280 | DEFINE_IDX_ENCODE_FUNCTION(32) | |
281 | ||
282 | #define DEFINE_MONO_ENCODE_FUNCTION(bpp) \ | |
283 | \ | |
284 | static void \ | |
285 | tight_encode_mono_rect##bpp(uint8_t *buf, int w, int h, \ | |
286 | uint##bpp##_t bg, uint##bpp##_t fg) { \ | |
287 | uint##bpp##_t *ptr; \ | |
288 | unsigned int value, mask; \ | |
289 | int aligned_width; \ | |
290 | int x, y, bg_bits; \ | |
291 | \ | |
292 | ptr = (uint##bpp##_t *) buf; \ | |
293 | aligned_width = w - w % 8; \ | |
294 | \ | |
295 | for (y = 0; y < h; y++) { \ | |
296 | for (x = 0; x < aligned_width; x += 8) { \ | |
297 | for (bg_bits = 0; bg_bits < 8; bg_bits++) { \ | |
298 | if (*ptr++ != bg) { \ | |
299 | break; \ | |
300 | } \ | |
301 | } \ | |
302 | if (bg_bits == 8) { \ | |
303 | *buf++ = 0; \ | |
304 | continue; \ | |
305 | } \ | |
306 | mask = 0x80 >> bg_bits; \ | |
307 | value = mask; \ | |
308 | for (bg_bits++; bg_bits < 8; bg_bits++) { \ | |
309 | mask >>= 1; \ | |
310 | if (*ptr++ != bg) { \ | |
311 | value |= mask; \ | |
312 | } \ | |
313 | } \ | |
314 | *buf++ = (uint8_t)value; \ | |
315 | } \ | |
316 | \ | |
317 | mask = 0x80; \ | |
318 | value = 0; \ | |
319 | if (x >= w) { \ | |
320 | continue; \ | |
321 | } \ | |
322 | \ | |
323 | for (; x < w; x++) { \ | |
324 | if (*ptr++ != bg) { \ | |
325 | value |= mask; \ | |
326 | } \ | |
327 | mask >>= 1; \ | |
328 | } \ | |
329 | *buf++ = (uint8_t)value; \ | |
330 | } \ | |
331 | } | |
332 | ||
333 | DEFINE_MONO_ENCODE_FUNCTION(8) | |
334 | DEFINE_MONO_ENCODE_FUNCTION(16) | |
335 | DEFINE_MONO_ENCODE_FUNCTION(32) | |
336 | ||
b4bea3f2 CC |
337 | /* |
338 | * Check if a rectangle is all of the same color. If needSameColor is | |
339 | * set to non-zero, then also check that its color equals to the | |
340 | * *colorPtr value. The result is 1 if the test is successfull, and in | |
341 | * that case new color will be stored in *colorPtr. | |
342 | */ | |
343 | ||
344 | #define DEFINE_CHECK_SOLID_FUNCTION(bpp) \ | |
345 | \ | |
346 | static bool \ | |
347 | check_solid_tile##bpp(VncState *vs, int x, int y, int w, int h, \ | |
348 | uint32_t* color, bool samecolor) \ | |
349 | { \ | |
350 | VncDisplay *vd = vs->vd; \ | |
351 | uint##bpp##_t *fbptr; \ | |
352 | uint##bpp##_t c; \ | |
353 | int dx, dy; \ | |
354 | \ | |
355 | fbptr = (uint##bpp##_t *) \ | |
356 | (vd->server->data + y * ds_get_linesize(vs->ds) + \ | |
357 | x * ds_get_bytes_per_pixel(vs->ds)); \ | |
358 | \ | |
359 | c = *fbptr; \ | |
360 | if (samecolor && (uint32_t)c != *color) { \ | |
361 | return false; \ | |
362 | } \ | |
363 | \ | |
364 | for (dy = 0; dy < h; dy++) { \ | |
365 | for (dx = 0; dx < w; dx++) { \ | |
366 | if (c != fbptr[dx]) { \ | |
367 | return false; \ | |
368 | } \ | |
369 | } \ | |
370 | fbptr = (uint##bpp##_t *) \ | |
371 | ((uint8_t *)fbptr + ds_get_linesize(vs->ds)); \ | |
372 | } \ | |
373 | \ | |
374 | *color = (uint32_t)c; \ | |
375 | return true; \ | |
376 | } | |
377 | ||
378 | DEFINE_CHECK_SOLID_FUNCTION(32) | |
379 | DEFINE_CHECK_SOLID_FUNCTION(16) | |
380 | DEFINE_CHECK_SOLID_FUNCTION(8) | |
381 | ||
382 | static bool check_solid_tile(VncState *vs, int x, int y, int w, int h, | |
383 | uint32_t* color, bool samecolor) | |
384 | { | |
385 | VncDisplay *vd = vs->vd; | |
386 | ||
387 | switch(vd->server->pf.bytes_per_pixel) { | |
388 | case 4: | |
389 | return check_solid_tile32(vs, x, y, w, h, color, samecolor); | |
390 | case 2: | |
391 | return check_solid_tile16(vs, x, y, w, h, color, samecolor); | |
392 | default: | |
393 | return check_solid_tile8(vs, x, y, w, h, color, samecolor); | |
394 | } | |
395 | } | |
396 | ||
397 | static void find_best_solid_area(VncState *vs, int x, int y, int w, int h, | |
398 | uint32_t color, int *w_ptr, int *h_ptr) | |
399 | { | |
400 | int dx, dy, dw, dh; | |
401 | int w_prev; | |
402 | int w_best = 0, h_best = 0; | |
403 | ||
404 | w_prev = w; | |
405 | ||
406 | for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { | |
407 | ||
408 | dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, y + h - dy); | |
409 | dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, w_prev); | |
410 | ||
411 | if (!check_solid_tile(vs, x, dy, dw, dh, &color, true)) { | |
412 | break; | |
413 | } | |
414 | ||
415 | for (dx = x + dw; dx < x + w_prev;) { | |
416 | dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, x + w_prev - dx); | |
417 | ||
418 | if (!check_solid_tile(vs, dx, dy, dw, dh, &color, true)) { | |
419 | break; | |
420 | } | |
421 | dx += dw; | |
422 | } | |
423 | ||
424 | w_prev = dx - x; | |
425 | if (w_prev * (dy + dh - y) > w_best * h_best) { | |
426 | w_best = w_prev; | |
427 | h_best = dy + dh - y; | |
428 | } | |
429 | } | |
430 | ||
431 | *w_ptr = w_best; | |
432 | *h_ptr = h_best; | |
433 | } | |
434 | ||
435 | static void extend_solid_area(VncState *vs, int x, int y, int w, int h, | |
436 | uint32_t color, int *x_ptr, int *y_ptr, | |
437 | int *w_ptr, int *h_ptr) | |
438 | { | |
439 | int cx, cy; | |
440 | ||
441 | /* Try to extend the area upwards. */ | |
442 | for ( cy = *y_ptr - 1; | |
443 | cy >= y && check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); | |
444 | cy-- ); | |
445 | *h_ptr += *y_ptr - (cy + 1); | |
446 | *y_ptr = cy + 1; | |
447 | ||
448 | /* ... downwards. */ | |
449 | for ( cy = *y_ptr + *h_ptr; | |
450 | cy < y + h && | |
451 | check_solid_tile(vs, *x_ptr, cy, *w_ptr, 1, &color, true); | |
452 | cy++ ); | |
453 | *h_ptr += cy - (*y_ptr + *h_ptr); | |
454 | ||
455 | /* ... to the left. */ | |
456 | for ( cx = *x_ptr - 1; | |
457 | cx >= x && check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); | |
458 | cx-- ); | |
459 | *w_ptr += *x_ptr - (cx + 1); | |
460 | *x_ptr = cx + 1; | |
461 | ||
462 | /* ... to the right. */ | |
463 | for ( cx = *x_ptr + *w_ptr; | |
464 | cx < x + w && | |
465 | check_solid_tile(vs, cx, *y_ptr, 1, *h_ptr, &color, true); | |
466 | cx++ ); | |
467 | *w_ptr += cx - (*x_ptr + *w_ptr); | |
468 | } | |
469 | ||
380282b0 CC |
470 | static int tight_init_stream(VncState *vs, int stream_id, |
471 | int level, int strategy) | |
472 | { | |
473 | z_streamp zstream = &vs->tight_stream[stream_id]; | |
474 | ||
475 | if (zstream->opaque == NULL) { | |
476 | int err; | |
477 | ||
478 | VNC_DEBUG("VNC: TIGHT: initializing zlib stream %d\n", stream_id); | |
479 | VNC_DEBUG("VNC: TIGHT: opaque = %p | vs = %p\n", zstream->opaque, vs); | |
480 | zstream->zalloc = vnc_zlib_zalloc; | |
481 | zstream->zfree = vnc_zlib_zfree; | |
482 | ||
483 | err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS, | |
484 | MAX_MEM_LEVEL, strategy); | |
485 | ||
486 | if (err != Z_OK) { | |
487 | fprintf(stderr, "VNC: error initializing zlib\n"); | |
488 | return -1; | |
489 | } | |
490 | ||
491 | vs->tight_levels[stream_id] = level; | |
492 | zstream->opaque = vs; | |
493 | } | |
494 | ||
495 | if (vs->tight_levels[stream_id] != level) { | |
496 | if (deflateParams(zstream, level, strategy) != Z_OK) { | |
497 | return -1; | |
498 | } | |
499 | vs->tight_levels[stream_id] = level; | |
500 | } | |
501 | return 0; | |
502 | } | |
503 | ||
504 | static void tight_send_compact_size(VncState *vs, size_t len) | |
505 | { | |
506 | int lpc = 0; | |
507 | int bytes = 0; | |
508 | char buf[3] = {0, 0, 0}; | |
509 | ||
510 | buf[bytes++] = len & 0x7F; | |
511 | if (len > 0x7F) { | |
512 | buf[bytes-1] |= 0x80; | |
513 | buf[bytes++] = (len >> 7) & 0x7F; | |
514 | if (len > 0x3FFF) { | |
515 | buf[bytes-1] |= 0x80; | |
516 | buf[bytes++] = (len >> 14) & 0xFF; | |
517 | } | |
518 | } | |
b4bea3f2 | 519 | for (lpc = 0; lpc < bytes; lpc++) { |
380282b0 CC |
520 | vnc_write_u8(vs, buf[lpc]); |
521 | } | |
522 | } | |
523 | ||
524 | static int tight_compress_data(VncState *vs, int stream_id, size_t bytes, | |
525 | int level, int strategy) | |
526 | { | |
527 | z_streamp zstream = &vs->tight_stream[stream_id]; | |
528 | int previous_out; | |
529 | ||
530 | if (bytes < VNC_TIGHT_MIN_TO_COMPRESS) { | |
531 | vnc_write(vs, vs->tight.buffer, vs->tight.offset); | |
532 | return bytes; | |
533 | } | |
534 | ||
535 | if (tight_init_stream(vs, stream_id, level, strategy)) { | |
536 | return -1; | |
537 | } | |
538 | ||
539 | /* reserve memory in output buffer */ | |
540 | buffer_reserve(&vs->tight_zlib, bytes + 64); | |
541 | ||
542 | /* set pointers */ | |
543 | zstream->next_in = vs->tight.buffer; | |
544 | zstream->avail_in = vs->tight.offset; | |
545 | zstream->next_out = vs->tight_zlib.buffer + vs->tight_zlib.offset; | |
546 | zstream->avail_out = vs->tight_zlib.capacity - vs->tight_zlib.offset; | |
547 | zstream->data_type = Z_BINARY; | |
548 | previous_out = zstream->total_out; | |
549 | ||
550 | /* start encoding */ | |
551 | if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) { | |
552 | fprintf(stderr, "VNC: error during tight compression\n"); | |
553 | return -1; | |
554 | } | |
555 | ||
556 | vs->tight_zlib.offset = vs->tight_zlib.capacity - zstream->avail_out; | |
557 | bytes = zstream->total_out - previous_out; | |
558 | ||
559 | tight_send_compact_size(vs, bytes); | |
560 | vnc_write(vs, vs->tight_zlib.buffer, bytes); | |
561 | ||
562 | buffer_reset(&vs->tight_zlib); | |
563 | ||
564 | return bytes; | |
565 | } | |
566 | ||
567 | /* | |
568 | * Subencoding implementations. | |
569 | */ | |
aa7d73fd | 570 | static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret) |
380282b0 | 571 | { |
380282b0 CC |
572 | uint32_t *buf32; |
573 | uint32_t pix; | |
574 | int rshift, gshift, bshift; | |
575 | ||
380282b0 CC |
576 | buf32 = (uint32_t *)buf; |
577 | ||
578 | if ((vs->clientds.flags & QEMU_BIG_ENDIAN_FLAG) == | |
579 | (vs->ds->surface->flags & QEMU_BIG_ENDIAN_FLAG)) { | |
580 | rshift = vs->clientds.pf.rshift; | |
581 | gshift = vs->clientds.pf.gshift; | |
582 | bshift = vs->clientds.pf.bshift; | |
583 | } else { | |
584 | rshift = 24 - vs->clientds.pf.rshift; | |
585 | gshift = 24 - vs->clientds.pf.gshift; | |
586 | bshift = 24 - vs->clientds.pf.bshift; | |
587 | } | |
588 | ||
aa7d73fd CC |
589 | if (ret) { |
590 | *ret = count * 3; | |
591 | } | |
380282b0 CC |
592 | |
593 | while (count--) { | |
594 | pix = *buf32++; | |
595 | *buf++ = (char)(pix >> rshift); | |
596 | *buf++ = (char)(pix >> gshift); | |
597 | *buf++ = (char)(pix >> bshift); | |
598 | } | |
599 | } | |
600 | ||
601 | static int send_full_color_rect(VncState *vs, int w, int h) | |
602 | { | |
603 | int stream = 0; | |
604 | size_t bytes; | |
605 | ||
606 | vnc_write_u8(vs, stream << 4); /* no flushing, no filter */ | |
607 | ||
608 | if (vs->tight_pixel24) { | |
aa7d73fd | 609 | tight_pack24(vs, vs->tight.buffer, w * h, &vs->tight.offset); |
380282b0 CC |
610 | bytes = 3; |
611 | } else { | |
612 | bytes = vs->clientds.pf.bytes_per_pixel; | |
613 | } | |
614 | ||
615 | bytes = tight_compress_data(vs, stream, w * h * bytes, | |
616 | tight_conf[vs->tight_compression].raw_zlib_level, | |
617 | Z_DEFAULT_STRATEGY); | |
618 | ||
619 | return (bytes >= 0); | |
620 | } | |
621 | ||
b4bea3f2 CC |
622 | static int send_solid_rect(VncState *vs) |
623 | { | |
624 | size_t bytes; | |
625 | ||
626 | vnc_write_u8(vs, VNC_TIGHT_FILL << 4); /* no flushing, no filter */ | |
627 | ||
628 | if (vs->tight_pixel24) { | |
aa7d73fd | 629 | tight_pack24(vs, vs->tight.buffer, 1, &vs->tight.offset); |
b4bea3f2 CC |
630 | bytes = 3; |
631 | } else { | |
632 | bytes = vs->clientds.pf.bytes_per_pixel; | |
633 | } | |
634 | ||
635 | vnc_write(vs, vs->tight.buffer, bytes); | |
636 | return 1; | |
637 | } | |
638 | ||
aa7d73fd CC |
639 | static int send_mono_rect(VncState *vs, int w, int h, uint32_t bg, uint32_t fg) |
640 | { | |
641 | size_t bytes; | |
642 | int stream = 1; | |
643 | int level = tight_conf[vs->tight_compression].mono_zlib_level; | |
644 | ||
645 | bytes = ((w + 7) / 8) * h; | |
646 | ||
647 | vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); | |
648 | vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); | |
649 | vnc_write_u8(vs, 1); | |
650 | ||
651 | switch(vs->clientds.pf.bytes_per_pixel) { | |
652 | case 4: | |
653 | { | |
654 | uint32_t buf[2] = {bg, fg}; | |
655 | size_t ret = sizeof (buf); | |
656 | ||
657 | if (vs->tight_pixel24) { | |
658 | tight_pack24(vs, (unsigned char*)buf, 2, &ret); | |
659 | } | |
660 | vnc_write(vs, buf, ret); | |
661 | ||
662 | tight_encode_mono_rect32(vs->tight.buffer, w, h, bg, fg); | |
663 | break; | |
664 | } | |
665 | case 2: | |
666 | vnc_write(vs, &bg, 2); | |
667 | vnc_write(vs, &fg, 2); | |
668 | tight_encode_mono_rect16(vs->tight.buffer, w, h, bg, fg); | |
669 | break; | |
670 | default: | |
671 | vnc_write_u8(vs, bg); | |
672 | vnc_write_u8(vs, fg); | |
673 | tight_encode_mono_rect8(vs->tight.buffer, w, h, bg, fg); | |
674 | break; | |
675 | } | |
676 | vs->tight.offset = bytes; | |
677 | ||
678 | bytes = tight_compress_data(vs, stream, bytes, level, Z_DEFAULT_STRATEGY); | |
679 | return (bytes >= 0); | |
680 | } | |
681 | ||
682 | struct palette_cb_priv { | |
683 | VncState *vs; | |
684 | uint8_t *header; | |
685 | }; | |
686 | ||
687 | static void write_palette(const char *key, QObject *obj, void *opaque) | |
688 | { | |
689 | struct palette_cb_priv *priv = opaque; | |
690 | VncState *vs = priv->vs; | |
691 | uint32_t bytes = vs->clientds.pf.bytes_per_pixel; | |
692 | uint8_t idx = qint_get_int(qobject_to_qint(obj)); | |
693 | ||
694 | if (bytes == 4) { | |
695 | uint32_t color = tight_palette_buf2rgb(32, (uint8_t *)key); | |
696 | ||
697 | ((uint32_t*)priv->header)[idx] = color; | |
698 | } else { | |
699 | uint16_t color = tight_palette_buf2rgb(16, (uint8_t *)key); | |
700 | ||
701 | ((uint16_t*)priv->header)[idx] = color; | |
702 | } | |
703 | } | |
704 | ||
705 | static int send_palette_rect(VncState *vs, int w, int h, struct QDict *palette) | |
706 | { | |
707 | int stream = 2; | |
708 | int level = tight_conf[vs->tight_compression].idx_zlib_level; | |
709 | int colors; | |
710 | size_t bytes; | |
711 | ||
712 | colors = qdict_size(palette); | |
713 | ||
714 | vnc_write_u8(vs, (stream | VNC_TIGHT_EXPLICIT_FILTER) << 4); | |
715 | vnc_write_u8(vs, VNC_TIGHT_FILTER_PALETTE); | |
716 | vnc_write_u8(vs, colors - 1); | |
717 | ||
718 | switch(vs->clientds.pf.bytes_per_pixel) { | |
719 | case 4: | |
720 | { | |
721 | size_t old_offset, offset; | |
722 | uint32_t header[qdict_size(palette)]; | |
723 | struct palette_cb_priv priv = { vs, (uint8_t *)header }; | |
724 | ||
725 | old_offset = vs->output.offset; | |
726 | qdict_iter(palette, write_palette, &priv); | |
727 | vnc_write(vs, header, sizeof(header)); | |
728 | ||
729 | if (vs->tight_pixel24) { | |
730 | tight_pack24(vs, vs->output.buffer + old_offset, colors, &offset); | |
731 | vs->output.offset = old_offset + offset; | |
732 | } | |
733 | ||
734 | tight_encode_indexed_rect32(vs->tight.buffer, w * h, palette); | |
735 | break; | |
736 | } | |
737 | case 2: | |
738 | { | |
739 | uint16_t header[qdict_size(palette)]; | |
740 | struct palette_cb_priv priv = { vs, (uint8_t *)header }; | |
741 | ||
742 | qdict_iter(palette, write_palette, &priv); | |
743 | vnc_write(vs, header, sizeof(header)); | |
744 | tight_encode_indexed_rect16(vs->tight.buffer, w * h, palette); | |
745 | break; | |
746 | } | |
747 | default: | |
748 | return -1; /* No palette for 8bits colors */ | |
749 | break; | |
750 | } | |
751 | bytes = w * h; | |
752 | vs->tight.offset = bytes; | |
753 | ||
754 | bytes = tight_compress_data(vs, stream, bytes, | |
755 | level, Z_DEFAULT_STRATEGY); | |
756 | return (bytes >= 0); | |
757 | } | |
758 | ||
380282b0 CC |
759 | static void vnc_tight_start(VncState *vs) |
760 | { | |
761 | buffer_reset(&vs->tight); | |
762 | ||
763 | // make the output buffer be the zlib buffer, so we can compress it later | |
764 | vs->tight_tmp = vs->output; | |
765 | vs->output = vs->tight; | |
766 | } | |
767 | ||
768 | static void vnc_tight_stop(VncState *vs) | |
769 | { | |
770 | // switch back to normal output/zlib buffers | |
771 | vs->tight = vs->output; | |
772 | vs->output = vs->tight_tmp; | |
773 | } | |
774 | ||
775 | static int send_sub_rect(VncState *vs, int x, int y, int w, int h) | |
776 | { | |
aa7d73fd CC |
777 | struct QDict *palette = NULL; |
778 | uint32_t bg = 0, fg = 0; | |
779 | int colors; | |
780 | int ret = 0; | |
781 | ||
380282b0 CC |
782 | vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_TIGHT); |
783 | ||
380282b0 CC |
784 | vnc_tight_start(vs); |
785 | vnc_raw_send_framebuffer_update(vs, x, y, w, h); | |
786 | vnc_tight_stop(vs); | |
787 | ||
aa7d73fd CC |
788 | colors = tight_fill_palette(vs, x, y, w * h, &fg, &bg, &palette); |
789 | ||
790 | if (colors == 0) { | |
791 | ret = send_full_color_rect(vs, w, h); | |
792 | } else if (colors == 1) { | |
793 | ret = send_solid_rect(vs); | |
794 | } else if (colors == 2) { | |
795 | ret = send_mono_rect(vs, w, h, bg, fg); | |
796 | } else if (colors <= 256) { | |
797 | ret = send_palette_rect(vs, w, h, palette); | |
798 | } | |
799 | QDECREF(palette); | |
800 | return ret; | |
380282b0 CC |
801 | } |
802 | ||
b4bea3f2 CC |
803 | static int send_sub_rect_solid(VncState *vs, int x, int y, int w, int h) |
804 | { | |
805 | vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_TIGHT); | |
806 | ||
807 | vnc_tight_start(vs); | |
808 | vnc_raw_send_framebuffer_update(vs, x, y, w, h); | |
809 | vnc_tight_stop(vs); | |
810 | ||
811 | return send_solid_rect(vs); | |
812 | } | |
813 | ||
380282b0 CC |
814 | static int send_rect_simple(VncState *vs, int x, int y, int w, int h) |
815 | { | |
816 | int max_size, max_width; | |
817 | int max_sub_width, max_sub_height; | |
818 | int dx, dy; | |
819 | int rw, rh; | |
820 | int n = 0; | |
821 | ||
822 | max_size = tight_conf[vs->tight_compression].max_rect_size; | |
823 | max_width = tight_conf[vs->tight_compression].max_rect_width; | |
824 | ||
825 | if (w > max_width || w * h > max_size) { | |
826 | max_sub_width = (w > max_width) ? max_width : w; | |
827 | max_sub_height = max_size / max_sub_width; | |
828 | ||
829 | for (dy = 0; dy < h; dy += max_sub_height) { | |
830 | for (dx = 0; dx < w; dx += max_width) { | |
831 | rw = MIN(max_sub_width, w - dx); | |
832 | rh = MIN(max_sub_height, h - dy); | |
833 | n += send_sub_rect(vs, x+dx, y+dy, rw, rh); | |
834 | } | |
835 | } | |
836 | } else { | |
837 | n += send_sub_rect(vs, x, y, w, h); | |
838 | } | |
839 | ||
840 | return n; | |
841 | } | |
842 | ||
b4bea3f2 CC |
843 | static int find_large_solid_color_rect(VncState *vs, int x, int y, |
844 | int w, int h, int max_rows) | |
845 | { | |
846 | int dx, dy, dw, dh; | |
847 | int n = 0; | |
848 | ||
849 | /* Try to find large solid-color areas and send them separately. */ | |
850 | ||
851 | for (dy = y; dy < y + h; dy += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { | |
852 | ||
853 | /* If a rectangle becomes too large, send its upper part now. */ | |
854 | ||
855 | if (dy - y >= max_rows) { | |
856 | n += send_rect_simple(vs, x, y, w, max_rows); | |
857 | y += max_rows; | |
858 | h -= max_rows; | |
859 | } | |
860 | ||
861 | dh = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (y + h - dy)); | |
862 | ||
863 | for (dx = x; dx < x + w; dx += VNC_TIGHT_MAX_SPLIT_TILE_SIZE) { | |
864 | uint32_t color_value; | |
865 | int x_best, y_best, w_best, h_best; | |
866 | ||
867 | dw = MIN(VNC_TIGHT_MAX_SPLIT_TILE_SIZE, (x + w - dx)); | |
868 | ||
869 | if (!check_solid_tile(vs, dx, dy, dw, dh, &color_value, false)) { | |
870 | continue ; | |
871 | } | |
872 | ||
873 | /* Get dimensions of solid-color area. */ | |
874 | ||
875 | find_best_solid_area(vs, dx, dy, w - (dx - x), h - (dy - y), | |
876 | color_value, &w_best, &h_best); | |
877 | ||
878 | /* Make sure a solid rectangle is large enough | |
879 | (or the whole rectangle is of the same color). */ | |
880 | ||
881 | if (w_best * h_best != w * h && | |
882 | w_best * h_best < VNC_TIGHT_MIN_SOLID_SUBRECT_SIZE) { | |
883 | continue; | |
884 | } | |
885 | ||
886 | /* Try to extend solid rectangle to maximum size. */ | |
887 | ||
888 | x_best = dx; y_best = dy; | |
889 | extend_solid_area(vs, x, y, w, h, color_value, | |
890 | &x_best, &y_best, &w_best, &h_best); | |
891 | ||
892 | /* Send rectangles at top and left to solid-color area. */ | |
893 | ||
894 | if (y_best != y) { | |
895 | n += send_rect_simple(vs, x, y, w, y_best-y); | |
896 | } | |
897 | if (x_best != x) { | |
898 | n += vnc_tight_send_framebuffer_update(vs, x, y_best, | |
899 | x_best-x, h_best); | |
900 | } | |
901 | ||
902 | /* Send solid-color rectangle. */ | |
903 | n += send_sub_rect_solid(vs, x_best, y_best, w_best, h_best); | |
904 | ||
905 | /* Send remaining rectangles (at right and bottom). */ | |
906 | ||
907 | if (x_best + w_best != x + w) { | |
908 | n += vnc_tight_send_framebuffer_update(vs, x_best+w_best, | |
909 | y_best, | |
910 | w-(x_best-x)-w_best, | |
911 | h_best); | |
912 | } | |
913 | if (y_best + h_best != y + h) { | |
914 | n += vnc_tight_send_framebuffer_update(vs, x, y_best+h_best, | |
915 | w, h-(y_best-y)-h_best); | |
916 | } | |
917 | ||
918 | /* Return after all recursive calls are done. */ | |
919 | return n; | |
920 | } | |
921 | } | |
922 | return n + send_rect_simple(vs, x, y, w, h); | |
923 | } | |
924 | ||
380282b0 CC |
925 | int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, |
926 | int w, int h) | |
927 | { | |
b4bea3f2 CC |
928 | int max_rows; |
929 | ||
380282b0 CC |
930 | if (vs->clientds.pf.bytes_per_pixel == 4 && vs->clientds.pf.rmax == 0xFF && |
931 | vs->clientds.pf.bmax == 0xFF && vs->clientds.pf.gmax == 0xFF) { | |
932 | vs->tight_pixel24 = true; | |
933 | } else { | |
934 | vs->tight_pixel24 = false; | |
935 | } | |
936 | ||
b4bea3f2 CC |
937 | if (w * h < VNC_TIGHT_MIN_SPLIT_RECT_SIZE) |
938 | return send_rect_simple(vs, x, y, w, h); | |
939 | ||
940 | /* Calculate maximum number of rows in one non-solid rectangle. */ | |
941 | ||
942 | max_rows = tight_conf[vs->tight_compression].max_rect_size; | |
943 | max_rows /= MIN(tight_conf[vs->tight_compression].max_rect_width, w); | |
944 | ||
945 | return find_large_solid_color_rect(vs, x, y, w, h, max_rows); | |
380282b0 CC |
946 | } |
947 | ||
948 | void vnc_tight_clear(VncState *vs) | |
949 | { | |
950 | int i; | |
951 | for (i=0; i<ARRAY_SIZE(vs->tight_stream); i++) { | |
952 | if (vs->tight_stream[i].opaque) { | |
953 | deflateEnd(&vs->tight_stream[i]); | |
954 | } | |
955 | } | |
956 | ||
957 | buffer_free(&vs->tight); | |
958 | buffer_free(&vs->tight_zlib); | |
959 | } |