1/* 2 * scale.c - deal with server-side scaling. 3 */ 4 5/* 6 * Copyright (C) 2005 Rohit Kumar, Johannes E. Schindelin 7 * Copyright (C) 2002 RealVNC Ltd. 8 * OSXvnc Copyright (C) 2001 Dan McGuirk <mcguirk@incompleteness.net>. 9 * Original Xvnc code Copyright (C) 1999 AT&T Laboratories Cambridge. 10 * All Rights Reserved. 11 * 12 * This is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This software is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this software; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 25 * USA. 26 */ 27 28#ifdef __STRICT_ANSI__ 29#define _BSD_SOURCE 30#endif 31#include <string.h> 32#include <rfb/rfb.h> 33#include <rfb/rfbregion.h> 34#include "private.h" 35 36#ifdef LIBVNCSERVER_HAVE_FCNTL_H 37#include <fcntl.h> 38#endif 39 40#ifdef WIN32 41#define write(sock,buf,len) send(sock,buf,len,0) 42#else 43#ifdef LIBVNCSERVER_HAVE_UNISTD_H 44#include <unistd.h> 45#endif 46#include <pwd.h> 47#ifdef LIBVNCSERVER_HAVE_SYS_SOCKET_H 48#include <sys/socket.h> 49#endif 50#ifdef LIBVNCSERVER_HAVE_NETINET_IN_H 51#include <netinet/in.h> 52#include <netinet/tcp.h> 53#include <arpa/inet.h> 54#endif 55#endif 56 57#ifdef DEBUGPROTO 58#undef DEBUGPROTO 59#define DEBUGPROTO(x) x 60#else 61#define DEBUGPROTO(x) 62#endif 63 64/****************************/ 65#define CEIL(x) ( (double) ((int) (x)) == (x) ? \ 66 (double) ((int) (x)) : (double) ((int) (x) + 1) ) 67#define FLOOR(x) ( (double) ((int) (x)) ) 68 69 70int ScaleX(rfbScreenInfoPtr from, rfbScreenInfoPtr to, int x) 71{ 72 if ((from==to) || (from==NULL) || (to==NULL)) return x; 73 return ((int)(((double) x / (double)from->width) * (double)to->width )); 74} 75 76int ScaleY(rfbScreenInfoPtr from, rfbScreenInfoPtr to, int y) 77{ 78 if ((from==to) || (from==NULL) || (to==NULL)) return y; 79 return ((int)(((double) y / (double)from->height) * (double)to->height )); 80} 81 82/* So, all of the encodings point to the ->screen->frameBuffer, 83 * We need to change this! 84 */ 85void rfbScaledCorrection(rfbScreenInfoPtr from, rfbScreenInfoPtr to, int *x, int *y, int *w, int *h, const char *function) 86{ 87 double x1,y1,w1,h1, x2, y2, w2, h2; 88 double scaleW = ((double) to->width) / ((double) from->width); 89 double scaleH = ((double) to->height) / ((double) from->height); 90 91 92 /* 93 * rfbLog("rfbScaledCorrection(%p -> %p, %dx%d->%dx%d (%dXx%dY-%dWx%dH)\n", 94 * from, to, from->width, from->height, to->width, to->height, *x, *y, *w, *h); 95 */ 96 97 /* If it's the original framebuffer... */ 98 if (from==to) return; 99 100 x1 = ((double) *x) * scaleW; 101 y1 = ((double) *y) * scaleH; 102 w1 = ((double) *w) * scaleW; 103 h1 = ((double) *h) * scaleH; 104 105 106 /*cast from double to int is same as "*x = floor(x1);" */ 107 x2 = FLOOR(x1); 108 y2 = FLOOR(y1); 109 110 /* include into W and H the jitter of scaling X and Y */ 111 w2 = CEIL(w1 + ( x1 - x2 )); 112 h2 = CEIL(h1 + ( y1 - y2 )); 113 114 /* 115 * rfbLog("%s (%dXx%dY-%dWx%dH -> %fXx%fY-%fWx%fH) {%dWx%dH -> %dWx%dH}\n", 116 * function, *x, *y, *w, *h, x2, y2, w2, h2, 117 * from->width, from->height, to->width, to->height); 118 */ 119 120 /* simulate ceil() without math library */ 121 *x = (int)x2; 122 *y = (int)y2; 123 *w = (int)w2; 124 *h = (int)h2; 125 126 /* Small changes for a thumbnail may be scaled to zero */ 127 if (*w==0) (*w)++; 128 if (*h==0) (*h)++; 129 /* scaling from small to big may overstep the size a bit */ 130 if (*x+*w > to->width) *w=to->width - *x; 131 if (*y+*h > to->height) *h=to->height - *y; 132} 133 134void rfbScaledScreenUpdateRect(rfbScreenInfoPtr screen, rfbScreenInfoPtr ptr, int x0, int y0, int w0, int h0) 135{ 136 int x,y,w,v,z; 137 int x1, y1, w1, h1; 138 int bitsPerPixel, bytesPerPixel, bytesPerLine, areaX, areaY, area2; 139 unsigned char *srcptr, *dstptr; 140 141 /* Nothing to do!!! */ 142 if (screen==ptr) return; 143 144 x1 = x0; 145 y1 = y0; 146 w1 = w0; 147 h1 = h0; 148 149 rfbScaledCorrection(screen, ptr, &x1, &y1, &w1, &h1, "rfbScaledScreenUpdateRect"); 150 x0 = ScaleX(ptr, screen, x1); 151 y0 = ScaleY(ptr, screen, y1); 152 w0 = ScaleX(ptr, screen, w1); 153 h0 = ScaleY(ptr, screen, h1); 154 155 bitsPerPixel = screen->bitsPerPixel; 156 bytesPerPixel = bitsPerPixel / 8; 157 bytesPerLine = w1 * bytesPerPixel; 158 srcptr = (unsigned char *)(screen->frameBuffer + 159 (y0 * screen->paddedWidthInBytes + x0 * bytesPerPixel)); 160 dstptr = (unsigned char *)(ptr->frameBuffer + 161 ( y1 * ptr->paddedWidthInBytes + x1 * bytesPerPixel)); 162 /* The area of the source framebuffer for each destination pixel */ 163 areaX = ScaleX(ptr,screen,1); 164 areaY = ScaleY(ptr,screen,1); 165 area2 = areaX*areaY; 166 167 168 /* Ensure that we do not go out of bounds */ 169 if ((x1+w1) > (ptr->width)) 170 { 171 if (x1==0) w1=ptr->width; else x1 = ptr->width - w1; 172 } 173 if ((y1+h1) > (ptr->height)) 174 { 175 if (y1==0) h1=ptr->height; else y1 = ptr->height - h1; 176 } 177 /* 178 * rfbLog("rfbScaledScreenUpdateRect(%dXx%dY-%dWx%dH -> %dXx%dY-%dWx%dH <%dx%d>) {%dWx%dH -> %dWx%dH} 0x%p\n", 179 * x0, y0, w0, h0, x1, y1, w1, h1, areaX, areaY, 180 * screen->width, screen->height, ptr->width, ptr->height, ptr->frameBuffer); 181 */ 182 183 if (screen->serverFormat.trueColour) { /* Blend neighbouring pixels together */ 184 unsigned char *srcptr2; 185 unsigned long pixel_value, red, green, blue; 186 unsigned int redShift = screen->serverFormat.redShift; 187 unsigned int greenShift = screen->serverFormat.greenShift; 188 unsigned int blueShift = screen->serverFormat.blueShift; 189 unsigned long redMax = screen->serverFormat.redMax; 190 unsigned long greenMax = screen->serverFormat.greenMax; 191 unsigned long blueMax = screen->serverFormat.blueMax; 192 193 /* for each *destination* pixel... */ 194 for (y = 0; y < h1; y++) { 195 for (x = 0; x < w1; x++) { 196 red = green = blue = 0; 197 /* Get the totals for rgb from the source grid... */ 198 for (w = 0; w < areaX; w++) { 199 for (v = 0; v < areaY; v++) { 200 srcptr2 = &srcptr[(((x * areaX) + w) * bytesPerPixel) + 201 (v * screen->paddedWidthInBytes)]; 202 pixel_value = 0; 203 204 205 switch (bytesPerPixel) { 206 case 4: pixel_value = *((unsigned int *)srcptr2); break; 207 case 2: pixel_value = *((unsigned short *)srcptr2); break; 208 case 1: pixel_value = *((unsigned char *)srcptr2); break; 209 default: 210 /* fixme: endianess problem? */ 211 for (z = 0; z < bytesPerPixel; z++) 212 pixel_value += (srcptr2[z] << (8 * z)); 213 break; 214 } 215 /* 216 srcptr2 += bytesPerPixel; 217 */ 218 219 red += ((pixel_value >> redShift) & redMax); 220 green += ((pixel_value >> greenShift) & greenMax); 221 blue += ((pixel_value >> blueShift) & blueMax); 222 223 } 224 } 225 /* We now have a total for all of the colors, find the average! */ 226 red /= area2; 227 green /= area2; 228 blue /= area2; 229 /* Stuff the new value back into memory */ 230 pixel_value = ((red & redMax) << redShift) | ((green & greenMax) << greenShift) | ((blue & blueMax) << blueShift); 231 232 switch (bytesPerPixel) { 233 case 4: *((unsigned int *)dstptr) = (unsigned int) pixel_value; break; 234 case 2: *((unsigned short *)dstptr) = (unsigned short) pixel_value; break; 235 case 1: *((unsigned char *)dstptr) = (unsigned char) pixel_value; break; 236 default: 237 /* fixme: endianess problem? */ 238 for (z = 0; z < bytesPerPixel; z++) 239 dstptr[z]=(pixel_value >> (8 * z)) & 0xff; 240 break; 241 } 242 dstptr += bytesPerPixel; 243 } 244 srcptr += (screen->paddedWidthInBytes * areaY); 245 dstptr += (ptr->paddedWidthInBytes - bytesPerLine); 246 } 247 } else 248 { /* Not truecolour, so we can't blend. Just use the top-left pixel instead */ 249 for (y = y1; y < (y1+h1); y++) { 250 for (x = x1; x < (x1+w1); x++) 251 memcpy (&ptr->frameBuffer[(y *ptr->paddedWidthInBytes) + (x * bytesPerPixel)], 252 &screen->frameBuffer[(y * areaY * screen->paddedWidthInBytes) + (x *areaX * bytesPerPixel)], bytesPerPixel); 253 } 254 } 255} 256 257void rfbScaledScreenUpdate(rfbScreenInfoPtr screen, int x1, int y1, int x2, int y2) 258{ 259 /* ok, now the task is to update each and every scaled version of the framebuffer 260 * and we only have to do this for this specific changed rectangle! 261 */ 262 rfbScreenInfoPtr ptr; 263 int count=0; 264 265 /* We don't point to cl->screen as it is the original */ 266 for (ptr=screen->scaledScreenNext;ptr!=NULL;ptr=ptr->scaledScreenNext) 267 { 268 /* Only update if it has active clients... */ 269 if (ptr->scaledScreenRefCount>0) 270 { 271 rfbScaledScreenUpdateRect(screen, ptr, x1, y1, x2-x1, y2-y1); 272 count++; 273 } 274 } 275} 276 277/* Create a new scaled version of the framebuffer */ 278rfbScreenInfoPtr rfbScaledScreenAllocate(rfbClientPtr cl, int width, int height) 279{ 280 rfbScreenInfoPtr ptr; 281 ptr = malloc(sizeof(rfbScreenInfo)); 282 if (ptr!=NULL) 283 { 284 /* copy *everything* (we don't use most of it, but just in case) */ 285 memcpy(ptr, cl->screen, sizeof(rfbScreenInfo)); 286 ptr->width = width; 287 ptr->height = height; 288 ptr->paddedWidthInBytes = (ptr->bitsPerPixel/8)*ptr->width; 289 290 /* Need to by multiples of 4 for Sparc systems */ 291 ptr->paddedWidthInBytes += (ptr->paddedWidthInBytes % 4); 292 293 /* Reset the reference count to 0! */ 294 ptr->scaledScreenRefCount = 0; 295 296 ptr->sizeInBytes = ptr->paddedWidthInBytes * ptr->height; 297 ptr->serverFormat = cl->screen->serverFormat; 298 299 ptr->frameBuffer = malloc(ptr->sizeInBytes); 300 if (ptr->frameBuffer!=NULL) 301 { 302 /* Reset to a known condition: scale the entire framebuffer */ 303 rfbScaledScreenUpdateRect(cl->screen, ptr, 0, 0, cl->screen->width, cl->screen->height); 304 /* Now, insert into the chain */ 305 LOCK(cl->updateMutex); 306 ptr->scaledScreenNext = cl->screen->scaledScreenNext; 307 cl->screen->scaledScreenNext = ptr; 308 UNLOCK(cl->updateMutex); 309 } 310 else 311 { 312 /* Failed to malloc the new frameBuffer, cleanup */ 313 free(ptr); 314 ptr=NULL; 315 } 316 } 317 return ptr; 318} 319 320/* Find an active scaled version of the framebuffer 321 * TODO: implement a refcount per scaled screen to prevent 322 * unreferenced scaled screens from hanging around 323 */ 324rfbScreenInfoPtr rfbScalingFind(rfbClientPtr cl, int width, int height) 325{ 326 rfbScreenInfoPtr ptr; 327 /* include the original in the search (ie: fine 1:1 scaled version of the frameBuffer) */ 328 for (ptr=cl->screen; ptr!=NULL; ptr=ptr->scaledScreenNext) 329 { 330 if ((ptr->width==width) && (ptr->height==height)) 331 return ptr; 332 } 333 return NULL; 334} 335 336/* Future needs "scale to 320x240, as that's the client's screen size */ 337void rfbScalingSetup(rfbClientPtr cl, int width, int height) 338{ 339 rfbScreenInfoPtr ptr; 340 341 ptr = rfbScalingFind(cl,width,height); 342 if (ptr==NULL) 343 ptr = rfbScaledScreenAllocate(cl,width,height); 344 /* Now, there is a new screen available (if ptr is not NULL) */ 345 if (ptr!=NULL) 346 { 347 /* Update it! */ 348 if (ptr->scaledScreenRefCount<1) 349 rfbScaledScreenUpdateRect(cl->screen, ptr, 0, 0, cl->screen->width, cl->screen->height); 350 /* 351 * rfbLog("Taking one from %dx%d-%d and adding it to %dx%d-%d\n", 352 * cl->scaledScreen->width, cl->scaledScreen->height, 353 * cl->scaledScreen->scaledScreenRefCount, 354 * ptr->width, ptr->height, ptr->scaledScreenRefCount); 355 */ 356 357 LOCK(cl->updateMutex); 358 cl->scaledScreen->scaledScreenRefCount--; 359 ptr->scaledScreenRefCount++; 360 cl->scaledScreen=ptr; 361 cl->newFBSizePending = TRUE; 362 UNLOCK(cl->updateMutex); 363 364 rfbLog("Scaling to %dx%d (refcount=%d)\n",width,height,ptr->scaledScreenRefCount); 365 } 366 else 367 rfbLog("Scaling to %dx%d failed, leaving things alone\n",width,height); 368} 369 370int rfbSendNewScaleSize(rfbClientPtr cl) 371{ 372 /* if the client supports newFBsize Encoding, use it */ 373 if (cl->useNewFBSize && cl->newFBSizePending) 374 return FALSE; 375 376 LOCK(cl->updateMutex); 377 cl->newFBSizePending = FALSE; 378 UNLOCK(cl->updateMutex); 379 380 if (cl->PalmVNC==TRUE) 381 { 382 rfbPalmVNCReSizeFrameBufferMsg pmsg; 383 pmsg.type = rfbPalmVNCReSizeFrameBuffer; 384 pmsg.pad1 = 0; 385 pmsg.desktop_w = Swap16IfLE(cl->screen->width); 386 pmsg.desktop_h = Swap16IfLE(cl->screen->height); 387 pmsg.buffer_w = Swap16IfLE(cl->scaledScreen->width); 388 pmsg.buffer_h = Swap16IfLE(cl->scaledScreen->height); 389 pmsg.pad2 = 0; 390 391 rfbLog("Sending a response to a PalmVNC style frameuffer resize event (%dx%d)\n", cl->scaledScreen->width, cl->scaledScreen->height); 392 if (rfbWriteExact(cl, (char *)&pmsg, sz_rfbPalmVNCReSizeFrameBufferMsg) < 0) { 393 rfbLogPerror("rfbNewClient: write"); 394 rfbCloseClient(cl); 395 rfbClientConnectionGone(cl); 396 return FALSE; 397 } 398 } 399 else 400 { 401 rfbResizeFrameBufferMsg rmsg; 402 rmsg.type = rfbResizeFrameBuffer; 403 rmsg.pad1=0; 404 rmsg.framebufferWidth = Swap16IfLE(cl->scaledScreen->width); 405 rmsg.framebufferHeigth = Swap16IfLE(cl->scaledScreen->height); 406 rfbLog("Sending a response to a UltraVNC style frameuffer resize event (%dx%d)\n", cl->scaledScreen->width, cl->scaledScreen->height); 407 if (rfbWriteExact(cl, (char *)&rmsg, sz_rfbResizeFrameBufferMsg) < 0) { 408 rfbLogPerror("rfbNewClient: write"); 409 rfbCloseClient(cl); 410 rfbClientConnectionGone(cl); 411 return FALSE; 412 } 413 } 414 return TRUE; 415} 416/****************************/ 417