summaryrefslogtreecommitdiffstats
path: root/cursor.c
blob: 032d2c4a109e595b96d9c5855dea7adf524c2a64 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
/*
 * cursor.c - support for cursor shape updates.
 */

/*
 *  Copyright (C) 2000, 2001 Const Kaplinsky.  All Rights Reserved.
 *  Copyright (C) 1999 AT&T Laboratories Cambridge.  All Rights Reserved.
 *
 *  This 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 software 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 software; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
 *  USA.
 */

#include "rfb.h"

static unsigned char rfbReverseByte[0x100];

/*
 * Send cursor shape either in X-style format or in client pixel format.
 */

Bool
rfbSendCursorShape(cl)
    rfbClientPtr cl;
{
    rfbCursorPtr pCursor;
    rfbFramebufferUpdateRectHeader rect;
    rfbXCursorColors colors;
    int saved_ublen;
    int bitmapRowBytes, maskBytes, dataBytes;
    int i, j;
    uint8_t *bitmapData;
    uint8_t bitmapByte;

    pCursor = cl->screen->getCursorPtr(cl);
    /*if(!pCursor) return TRUE;*/

    if (cl->useRichCursorEncoding) {
      if(pCursor && !pCursor->richSource)
	MakeRichCursorFromXCursor(cl->screen,pCursor);
      rect.encoding = Swap32IfLE(rfbEncodingRichCursor);
    } else {
       if(pCursor && !pCursor->source)
	 MakeXCursorFromRichCursor(cl->screen,pCursor);
       rect.encoding = Swap32IfLE(rfbEncodingXCursor);
    }

    /* If there is no cursor, send update with empty cursor data. */

    if ( pCursor && pCursor->width == 1 &&
	 pCursor->height == 1 &&
	 pCursor->mask[0] == 0 ) {
	pCursor = NULL;
    }

    if (pCursor == NULL) {
	if (cl->ublen + sz_rfbFramebufferUpdateRectHeader > UPDATE_BUF_SIZE ) {
	    if (!rfbSendUpdateBuf(cl))
		return FALSE;
	}
	rect.r.x = rect.r.y = 0;
	rect.r.w = rect.r.h = 0;
	memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,
	       sz_rfbFramebufferUpdateRectHeader);
	cl->ublen += sz_rfbFramebufferUpdateRectHeader;

	cl->rfbCursorShapeBytesSent += sz_rfbFramebufferUpdateRectHeader;
	cl->rfbCursorShapeUpdatesSent++;

	if (!rfbSendUpdateBuf(cl))
	    return FALSE;

	return TRUE;
    }

    /* Calculate data sizes. */

    bitmapRowBytes = (pCursor->width + 7) / 8;
    maskBytes = bitmapRowBytes * pCursor->height;
    dataBytes = (cl->useRichCursorEncoding) ?
	(pCursor->width * pCursor->height *
	 (cl->format.bitsPerPixel / 8)) : maskBytes;

    /* Send buffer contents if needed. */

    if ( cl->ublen + sz_rfbFramebufferUpdateRectHeader +
	 sz_rfbXCursorColors + maskBytes + dataBytes > UPDATE_BUF_SIZE ) {
	if (!rfbSendUpdateBuf(cl))
	    return FALSE;
    }

    if ( cl->ublen + sz_rfbFramebufferUpdateRectHeader +
	 sz_rfbXCursorColors + maskBytes + dataBytes > UPDATE_BUF_SIZE ) {
	return FALSE;		/* FIXME. */
    }

    saved_ublen = cl->ublen;

    /* Prepare rectangle header. */

    rect.r.x = Swap16IfLE(pCursor->xhot);
    rect.r.y = Swap16IfLE(pCursor->yhot);
    rect.r.w = Swap16IfLE(pCursor->width);
    rect.r.h = Swap16IfLE(pCursor->height);

    memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,sz_rfbFramebufferUpdateRectHeader);
    cl->ublen += sz_rfbFramebufferUpdateRectHeader;

    /* Prepare actual cursor data (depends on encoding used). */

    if (!cl->useRichCursorEncoding) {
	/* XCursor encoding. */
	colors.foreRed   = (char)(pCursor->foreRed   >> 8);
	colors.foreGreen = (char)(pCursor->foreGreen >> 8);
	colors.foreBlue  = (char)(pCursor->foreBlue  >> 8);
	colors.backRed   = (char)(pCursor->backRed   >> 8);
	colors.backGreen = (char)(pCursor->backGreen >> 8);
	colors.backBlue  = (char)(pCursor->backBlue  >> 8);

	memcpy(&cl->updateBuf[cl->ublen], (char *)&colors, sz_rfbXCursorColors);
	cl->ublen += sz_rfbXCursorColors;

	bitmapData = (uint8_t *)pCursor->source;

	for (i = 0; i < pCursor->height; i++) {
	    for (j = 0; j < bitmapRowBytes; j++) {
		bitmapByte = bitmapData[i * bitmapRowBytes + j];
		cl->updateBuf[cl->ublen++] = (char)bitmapByte;
	    }
	}
    } else {
	/* RichCursor encoding. */
       int bpp1=cl->screen->rfbServerFormat.bitsPerPixel/8,
	 bpp2=cl->format.bitsPerPixel/8;
       (*cl->translateFn)(cl->translateLookupTable,
		       &(cl->screen->rfbServerFormat),
                       &cl->format, (char*)pCursor->richSource,
		       &cl->updateBuf[cl->ublen],
                       pCursor->width*bpp1, pCursor->width, pCursor->height);

       cl->ublen += pCursor->width*bpp2*pCursor->height;
    }

    /* Prepare transparency mask. */

    bitmapData = (uint8_t *)pCursor->mask;

    for (i = 0; i < pCursor->height; i++) {
	for (j = 0; j < bitmapRowBytes; j++) {
	    bitmapByte = bitmapData[i * bitmapRowBytes + j];
	    cl->updateBuf[cl->ublen++] = (char)bitmapByte;
	}
    }

    /* Send everything we have prepared in the cl->updateBuf[]. */

    cl->rfbCursorShapeBytesSent += (cl->ublen - saved_ublen);
    cl->rfbCursorShapeUpdatesSent++;

    if (!rfbSendUpdateBuf(cl))
	return FALSE;

    return TRUE;
}

/*
 * Send cursor position (PointerPos pseudo-encoding).
 */

Bool
rfbSendCursorPos(rfbClientPtr cl)
{
  rfbFramebufferUpdateRectHeader rect;

  if (cl->ublen + sz_rfbFramebufferUpdateRectHeader > UPDATE_BUF_SIZE) {
    if (!rfbSendUpdateBuf(cl))
      return FALSE;
  }

  rect.encoding = Swap32IfLE(rfbEncodingPointerPos);
  rect.r.x = Swap16IfLE(cl->screen->cursorX);
  rect.r.y = Swap16IfLE(cl->screen->cursorY);
  rect.r.w = 0;
  rect.r.h = 0;

  memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,
	 sz_rfbFramebufferUpdateRectHeader);
  cl->ublen += sz_rfbFramebufferUpdateRectHeader;

  cl->rfbCursorPosBytesSent += sz_rfbFramebufferUpdateRectHeader;
  cl->rfbCursorPosUpdatesSent++;

  if (!rfbSendUpdateBuf(cl))
    return FALSE;

  return TRUE;
}

/* conversion routine for predefined cursors in LSB order */
static unsigned char rfbReverseByte[0x100] = {
  /* copied from Xvnc/lib/font/util/utilbitmap.c */
	0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
	0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
	0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
	0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
	0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
	0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
	0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
	0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
	0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
	0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
	0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
	0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
	0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
	0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
	0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
	0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
	0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
	0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
	0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
	0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
	0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
	0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
	0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
	0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
	0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
	0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
	0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
	0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
	0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
	0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
	0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
	0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};

void rfbConvertLSBCursorBitmapOrMask(int width,int height,unsigned char* bitmap)
{
   int i,t=(width+7)/8*height;
   for(i=0;i<t;i++)
     bitmap[i]=rfbReverseByte[(int)bitmap[i]];
}

/* Cursor creation. You "paint" a cursor and let these routines do the work */

rfbCursorPtr rfbMakeXCursor(int width,int height,char* cursorString,char* maskString)
{
   int i,j,w=(width+7)/8;
   rfbCursorPtr cursor = (rfbCursorPtr)calloc(1,sizeof(rfbCursor));
   char* cp;
   unsigned char bit;

   cursor->width=width;
   cursor->height=height;
   /*cursor->backRed=cursor->backGreen=cursor->backBlue=0xffff;*/
   cursor->foreRed=cursor->foreGreen=cursor->foreBlue=0xffff;
   
   cursor->source = (unsigned char*)calloc(w,height);
   for(j=0,cp=cursorString;j<height;j++)
      for(i=0,bit=0x80;i<width;i++,bit=(bit&1)?0x80:bit>>1,cp++)
	if(*cp!=' ') cursor->source[j*w+i/8]|=bit;

   if(maskString) {
      cursor->mask = (unsigned char*)calloc(w,height);
      for(j=0,cp=maskString;j<height;j++)
	for(i=0,bit=0x80;i<width;i++,bit=(bit&1)?0x80:bit>>1,cp++)
	  if(*cp!=' ') cursor->mask[j*w+i/8]|=bit;
   } else
     cursor->mask = (unsigned char*)rfbMakeMaskForXCursor(width,height,(char*)cursor->source);

   return(cursor);
}

char* rfbMakeMaskForXCursor(int width,int height,char* source)
{
   int i,j,w=(width+7)/8;
   char* mask=(char*)calloc(w,height);
   unsigned char c;
   
   for(j=0;j<height;j++)
     for(i=w-1;i>=0;i--) {
	c=source[j*w+i];
	if(j>0) c|=source[(j-1)*w+i];
	if(j<height-1) c|=source[(j+1)*w+i];
	
	if(i>0 && (c&0x80))
	  mask[j*w+i-1]|=0x01;
	if(i<w-1 && (c&0x01))
	  mask[j*w+i+1]|=0x80;
	
	mask[j*w+i]|=(c<<1)|c|(c>>1);
     }
   
   return(mask);
}

void rfbFreeCursor(rfbCursorPtr cursor)
{
   if(cursor) {
      if(cursor->richSource)
	 free(cursor->richSource);
      free(cursor->source);
      free(cursor->mask);
      free(cursor);
   }
   
}

/* background and foregroud colour have to be set beforehand */
void MakeXCursorFromRichCursor(rfbScreenInfoPtr rfbScreen,rfbCursorPtr cursor)
{
   rfbPixelFormat* format=&rfbScreen->rfbServerFormat;
   int i,j,w=(cursor->width+7)/8,bpp=format->bitsPerPixel/8,
     width=cursor->width*bpp;
   uint32_t background;
   char *back=(char*)&background;
   unsigned char bit;
   
   cursor->source=(unsigned char*)calloc(w,cursor->height);
   
   if(format->bigEndian)
      back+=4-bpp;

   background=cursor->backRed<<format->redShift|
     cursor->backGreen<<format->greenShift|cursor->backBlue<<format->blueShift;

   for(j=0;j<cursor->height;j++)
     for(i=0,bit=0x80;i<cursor->width;i++,bit=(bit&1)?0x80:bit>>1)
       if(memcmp(cursor->richSource+j*width+i*bpp,back,bpp))
	 cursor->source[j*w+i/8]|=bit;
}

void MakeRichCursorFromXCursor(rfbScreenInfoPtr rfbScreen,rfbCursorPtr cursor)
{
   rfbPixelFormat* format=&rfbScreen->rfbServerFormat;
   int i,j,w=(cursor->width+7)/8,bpp=format->bitsPerPixel/8;
   uint32_t background,foreground;
   char *back=(char*)&background,*fore=(char*)&foreground;
   unsigned char *cp;
   unsigned char bit;

   cp=cursor->richSource=(unsigned char*)calloc(cursor->width*bpp,cursor->height);
   
   if(format->bigEndian) {
      back+=4-bpp;
      fore+=4-bpp;
   }

   background=cursor->backRed<<format->redShift|
     cursor->backGreen<<format->greenShift|cursor->backBlue<<format->blueShift;
   foreground=cursor->foreRed<<format->redShift|
     cursor->foreGreen<<format->greenShift|cursor->foreBlue<<format->blueShift;
   
   for(j=0;j<cursor->height;j++)
     for(i=0,bit=0x80;i<cursor->height;i++,bit=(bit&1)?0x80:bit>>1,cp+=bpp)
       if(cursor->source[j*w+i/8]&bit) memcpy(cp,fore,bpp);
       else memcpy(cp,back,bpp);
}

/* functions to draw/hide cursor directly in the frame buffer */

void rfbUndrawCursor(rfbScreenInfoPtr s)
{
   rfbCursorPtr c=s->cursor;
   int j,x1,x2,y1,y2,bpp=s->rfbServerFormat.bitsPerPixel/8,
     rowstride=s->paddedWidthInBytes;
   LOCK(s->cursorMutex);
   if(!s->cursorIsDrawn) {
     UNLOCK(s->cursorMutex);
     return;
   }
   
   /* restore what is under the cursor */
   x1=s->cursorX-c->xhot;
   x2=x1+c->width;
   if(x1<0) x1=0;
   if(x2>=s->width) x2=s->width-1;
   x2-=x1; if(x2<=0) {
     UNLOCK(s->cursorMutex);
     return;
   }
   y1=s->cursorY-c->yhot;
   y2=y1+c->height;
   if(y1<0) y1=0;
   if(y2>=s->height) y2=s->height-1;
   y2-=y1; if(y2<=0) {
     UNLOCK(s->cursorMutex);
     return;
   }

   /* get saved data */
   for(j=0;j<y2;j++)
     memcpy(s->frameBuffer+(y1+j)*rowstride+x1*bpp,
	    s->underCursorBuffer+j*x2*bpp,
	    x2*bpp);
   
   rfbMarkRectAsModified(s,x1,y1,x1+x2,y1+y2);
   s->cursorIsDrawn = FALSE;
   UNLOCK(s->cursorMutex);
}

void rfbDrawCursor(rfbScreenInfoPtr s)
{
   rfbCursorPtr c=s->cursor;
   int i,j,x1,x2,y1,y2,i1,j1,bpp=s->rfbServerFormat.bitsPerPixel/8,
     rowstride=s->paddedWidthInBytes,
     bufSize,w;
   if(!c) return;
   LOCK(s->cursorMutex);
   if(s->cursorIsDrawn) {
     /* is already drawn */
     UNLOCK(s->cursorMutex);
     return;
   }
   bufSize=c->width*c->height*bpp;
   w=(c->width+7)/8;
   if(s->underCursorBufferLen<bufSize) {
      if(s->underCursorBuffer!=NULL)
	free(s->underCursorBuffer);
      s->underCursorBuffer=malloc(bufSize);
      s->underCursorBufferLen=bufSize;
   }
   /* save what is under the cursor */
   i1=j1=0; /* offset in cursor */
   x1=s->cursorX-c->xhot;
   x2=x1+c->width;
   if(x1<0) { i1=-x1; x1=0; }
   if(x2>=s->width) x2=s->width-1;
   x2-=x1; if(x2<=0) {
     UNLOCK(s->cursorMutex);
     return; /* nothing to do */
   }
   y1=s->cursorY-c->yhot;
   y2=y1+c->height;
   if(y1<0) { j1=-y1; y1=0; }
   if(y2>=s->height) y2=s->height-1;
   y2-=y1; if(y2<=0) {
     UNLOCK(s->cursorMutex);
     return; /* nothing to do */
   }

   /* save data */
   for(j=0;j<y2;j++)
     memcpy(s->underCursorBuffer+j*x2*bpp,
	    s->frameBuffer+(y1+j)*rowstride+x1*bpp,
	    x2*bpp);
   
   if(!c->richSource)
     MakeRichCursorFromXCursor(s,c);
   
   /* now the cursor has to be drawn */
   for(j=0;j<y2;j++)
     for(i=0;i<x2;i++)
       if((c->mask[(j+j1)*w+(i+i1)/8]<<((i+i1)&7))&0x80)
	 memcpy(s->frameBuffer+(j+y1)*rowstride+(i+x1)*bpp,
		c->richSource+(j+j1)*c->width*bpp+(i+i1)*bpp,bpp);


   rfbMarkRectAsModified(s,x1,y1,x1+x2,y1+y2);
   s->cursorIsDrawn = TRUE;
   UNLOCK(s->cursorMutex);
}

/* for debugging */

void rfbPrintXCursor(rfbCursorPtr cursor)
{
   int i,i1,j,w=(cursor->width+7)/8;
   unsigned char bit;
   for(j=0;j<cursor->height;j++) {
      for(i=0,i1=0,bit=0x80;i1<cursor->width;i1++,i+=(bit&1)?1:0,bit=(bit&1)?0x80:bit>>1)
	if(cursor->source[j*w+i]&bit) putchar('#'); else putchar(' ');
      putchar(':');
      for(i=0,i1=0,bit=0x80;i1<cursor->width;i1++,i+=(bit&1)?1:0,bit=(bit&1)?0x80:bit>>1)
	if(cursor->mask[j*w+i]&bit) putchar('#'); else putchar(' ');
      putchar('\n');
   }
}

void rfbSetCursor(rfbScreenInfoPtr rfbScreen,rfbCursorPtr c,Bool freeOld)
{
  LOCK(rfbScreen->cursorMutex);
  while(rfbScreen->cursorIsDrawn) {
    UNLOCK(rfbScreen->cursorMutex);
    rfbUndrawCursor(rfbScreen);
    LOCK(rfbScreen->cursorMutex);
  }

  if(freeOld && rfbScreen->cursor)
    rfbFreeCursor(rfbScreen->cursor);

  rfbScreen->cursor = c;

  UNLOCK(rfbScreen->cursorMutex);
}