root / vnc-encoding-tight.c @ 11165820
History | View | Annotate | Download (36 kB)
| 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 |
|
| 29 |
#include "qdict.h" |
| 30 |
#include "qint.h" |
| 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 |
|
| 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); \ |
| 178 |
tight_palette_insert(*palette, ci, bpp, max); \ |
| 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]; \
|
| 251 |
int i, rep; \
|
| 252 |
uint8_t idx; \ |
| 253 |
\ |
| 254 |
src = (uint##bpp##_t *) buf; \ |
| 255 |
\ |
| 256 |
for (i = 0; i < count; i++) { \ |
| 257 |
rgb = *src++; \ |
| 258 |
rep = 0; \
|
| 259 |
while (i < count && *src == rgb) { \
|
| 260 |
rep++, src++, i++; \ |
| 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 |
|
| 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 |
|
| 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 |
} |
| 519 |
for (lpc = 0; lpc < bytes; lpc++) { |
| 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 |
*/
|
| 570 |
static void tight_pack24(VncState *vs, uint8_t *buf, size_t count, size_t *ret) |
| 571 |
{
|
| 572 |
uint32_t *buf32; |
| 573 |
uint32_t pix; |
| 574 |
int rshift, gshift, bshift;
|
| 575 |
|
| 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 |
|
| 589 |
if (ret) {
|
| 590 |
*ret = count * 3;
|
| 591 |
} |
| 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) {
|
| 609 |
tight_pack24(vs, vs->tight.buffer, w * h, &vs->tight.offset); |
| 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 |
|
| 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) {
|
| 629 |
tight_pack24(vs, vs->tight.buffer, 1, &vs->tight.offset);
|
| 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 |
|
| 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 |
|
| 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 |
{
|
| 777 |
struct QDict *palette = NULL; |
| 778 |
uint32_t bg = 0, fg = 0; |
| 779 |
int colors;
|
| 780 |
int ret = 0; |
| 781 |
|
| 782 |
vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_TIGHT); |
| 783 |
|
| 784 |
vnc_tight_start(vs); |
| 785 |
vnc_raw_send_framebuffer_update(vs, x, y, w, h); |
| 786 |
vnc_tight_stop(vs); |
| 787 |
|
| 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;
|
| 801 |
} |
| 802 |
|
| 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 |
|
| 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 |
|
| 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 |
|
| 925 |
int vnc_tight_send_framebuffer_update(VncState *vs, int x, int y, |
| 926 |
int w, int h) |
| 927 |
{
|
| 928 |
int max_rows;
|
| 929 |
|
| 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 |
|
| 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);
|
| 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 |
} |