LibVNCServer/LibVNCClient
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cursor.c
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1 /*
2  * Copyright (C) 2001,2002 Constantin Kaplinsky. All Rights Reserved.
3  *
4  * This is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This software is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this software; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
17  * USA.
18  */
19 
20 /*
21  * cursor.c - code to support cursor shape updates (XCursor and
22  * RichCursor preudo-encodings).
23  */
24 
25 #include <rfb/rfbclient.h>
26 
27 
28 #define OPER_SAVE 0
29 #define OPER_RESTORE 1
30 
31 #define RGB24_TO_PIXEL(bpp,r,g,b) \
32  ((((uint##bpp##_t)(r) & 0xFF) * client->format.redMax + 127) / 255 \
33  << client->format.redShift | \
34  (((uint##bpp##_t)(g) & 0xFF) * client->format.greenMax + 127) / 255 \
35  << client->format.greenShift | \
36  (((uint##bpp##_t)(b) & 0xFF) * client->format.blueMax + 127) / 255 \
37  << client->format.blueShift)
38 
39 
40 /*********************************************************************
41  * HandleCursorShape(). Support for XCursor and RichCursor shape
42  * updates. We emulate cursor operating on the frame buffer (that is
43  * why we call it "software cursor").
44  ********************************************************************/
45 
46 rfbBool HandleCursorShape(rfbClient* client,int xhot, int yhot, int width, int height, uint32_t enc)
47 {
48  int bytesPerPixel;
49  size_t bytesPerRow, bytesMaskData;
50  rfbXCursorColors rgb;
51  uint32_t colors[2];
52  char *buf;
53  uint8_t *ptr;
54  int x, y, b;
55 
56  bytesPerPixel = client->format.bitsPerPixel / 8;
57  bytesPerRow = (width + 7) / 8;
58  bytesMaskData = bytesPerRow * height;
59 
60  if (width * height == 0)
61  return TRUE;
62 
63  /* Allocate memory for pixel data and temporary mask data. */
64  if(client->rcSource)
65  free(client->rcSource);
66 
67  client->rcSource = malloc(width * height * bytesPerPixel);
68  if (client->rcSource == NULL)
69  return FALSE;
70 
71  buf = malloc(bytesMaskData);
72  if (buf == NULL) {
73  free(client->rcSource);
74  client->rcSource = NULL;
75  return FALSE;
76  }
77 
78  /* Read and decode cursor pixel data, depending on the encoding type. */
79 
80  if (enc == rfbEncodingXCursor) {
81  /* Read and convert background and foreground colors. */
82  if (!ReadFromRFBServer(client, (char *)&rgb, sz_rfbXCursorColors)) {
83  free(client->rcSource);
84  client->rcSource = NULL;
85  free(buf);
86  return FALSE;
87  }
88  colors[0] = RGB24_TO_PIXEL(32, rgb.backRed, rgb.backGreen, rgb.backBlue);
89  colors[1] = RGB24_TO_PIXEL(32, rgb.foreRed, rgb.foreGreen, rgb.foreBlue);
90 
91  /* Read 1bpp pixel data into a temporary buffer. */
92  if (!ReadFromRFBServer(client, buf, bytesMaskData)) {
93  free(client->rcSource);
94  client->rcSource = NULL;
95  free(buf);
96  return FALSE;
97  }
98 
99  /* Convert 1bpp data to byte-wide color indices. */
100  ptr = client->rcSource;
101  for (y = 0; y < height; y++) {
102  for (x = 0; x < width / 8; x++) {
103  for (b = 7; b >= 0; b--) {
104  *ptr = buf[y * bytesPerRow + x] >> b & 1;
105  ptr += bytesPerPixel;
106  }
107  }
108  for (b = 7; b > 7 - width % 8; b--) {
109  *ptr = buf[y * bytesPerRow + x] >> b & 1;
110  ptr += bytesPerPixel;
111  }
112  }
113 
114  /* Convert indices into the actual pixel values. */
115  switch (bytesPerPixel) {
116  case 1:
117  for (x = 0; x < width * height; x++)
118  client->rcSource[x] = (uint8_t)colors[client->rcSource[x]];
119  break;
120  case 2:
121  for (x = 0; x < width * height; x++)
122  ((uint16_t *)client->rcSource)[x] = (uint16_t)colors[client->rcSource[x * 2]];
123  break;
124  case 4:
125  for (x = 0; x < width * height; x++)
126  ((uint32_t *)client->rcSource)[x] = colors[client->rcSource[x * 4]];
127  break;
128  }
129 
130  } else { /* enc == rfbEncodingRichCursor */
131 
132  if (!ReadFromRFBServer(client, (char *)client->rcSource, width * height * bytesPerPixel)) {
133  free(client->rcSource);
134  client->rcSource = NULL;
135  free(buf);
136  return FALSE;
137  }
138 
139  }
140 
141  /* Read and decode mask data. */
142 
143  if (!ReadFromRFBServer(client, buf, bytesMaskData)) {
144  free(client->rcSource);
145  client->rcSource = NULL;
146  free(buf);
147  return FALSE;
148  }
149 
150  client->rcMask = malloc(width * height);
151  if (client->rcMask == NULL) {
152  free(client->rcSource);
153  client->rcSource = NULL;
154  free(buf);
155  return FALSE;
156  }
157 
158  ptr = client->rcMask;
159  for (y = 0; y < height; y++) {
160  for (x = 0; x < width / 8; x++) {
161  for (b = 7; b >= 0; b--) {
162  *ptr++ = buf[y * bytesPerRow + x] >> b & 1;
163  }
164  }
165  for (b = 7; b > 7 - width % 8; b--) {
166  *ptr++ = buf[y * bytesPerRow + x] >> b & 1;
167  }
168  }
169 
170  if (client->GotCursorShape != NULL) {
171  client->GotCursorShape(client, xhot, yhot, width, height, bytesPerPixel);
172  }
173 
174  free(buf);
175 
176  return TRUE;
177 }
178 
179