LibVNCServer/LibVNCClient
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
hextile.c
Go to the documentation of this file.
1 /*
2  * Copyright (C) 1999 AT&T Laboratories Cambridge. 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  * hextile.c - handle hextile encoding.
22  *
23  * This file shouldn't be compiled directly. It is included multiple times by
24  * rfbproto.c, each time with a different definition of the macro BPP. For
25  * each value of BPP, this file defines a function which handles a hextile
26  * encoded rectangle with BPP bits per pixel.
27  */
28 
29 #define HandleHextileBPP CONCAT2E(HandleHextile,BPP)
30 #define CARDBPP CONCAT3E(uint,BPP,_t)
31 
32 static rfbBool
33 HandleHextileBPP (rfbClient* client, int rx, int ry, int rw, int rh)
34 {
35  CARDBPP bg, fg;
36  int i;
37  uint8_t *ptr;
38  int x, y, w, h;
39  int sx, sy, sw, sh;
40  uint8_t subencoding;
41  uint8_t nSubrects;
42 
43  for (y = ry; y < ry+rh; y += 16) {
44  for (x = rx; x < rx+rw; x += 16) {
45  w = h = 16;
46  if (rx+rw - x < 16)
47  w = rx+rw - x;
48  if (ry+rh - y < 16)
49  h = ry+rh - y;
50 
51  if (!ReadFromRFBServer(client, (char *)&subencoding, 1))
52  return FALSE;
53 
54  if (subencoding & rfbHextileRaw) {
55  if (!ReadFromRFBServer(client, client->buffer, w * h * (BPP / 8)))
56  return FALSE;
57 
58  CopyRectangle(client, (uint8_t *)client->buffer, x, y, w, h);
59 
60  continue;
61  }
62 
63  if (subencoding & rfbHextileBackgroundSpecified)
64  if (!ReadFromRFBServer(client, (char *)&bg, sizeof(bg)))
65  return FALSE;
66 
67  FillRectangle(client, x, y, w, h, bg);
68 
69  if (subencoding & rfbHextileForegroundSpecified)
70  if (!ReadFromRFBServer(client, (char *)&fg, sizeof(fg)))
71  return FALSE;
72 
73  if (!(subencoding & rfbHextileAnySubrects)) {
74  continue;
75  }
76 
77  if (!ReadFromRFBServer(client, (char *)&nSubrects, 1))
78  return FALSE;
79 
80  ptr = (uint8_t*)client->buffer;
81 
82  if (subencoding & rfbHextileSubrectsColoured) {
83  if (!ReadFromRFBServer(client, client->buffer, nSubrects * (2 + (BPP / 8))))
84  return FALSE;
85 
86  for (i = 0; i < nSubrects; i++) {
87 #if BPP==8
88  GET_PIXEL8(fg, ptr);
89 #elif BPP==16
90  GET_PIXEL16(fg, ptr);
91 #elif BPP==32
92  GET_PIXEL32(fg, ptr);
93 #else
94 #error "Invalid BPP"
95 #endif
96  sx = rfbHextileExtractX(*ptr);
97  sy = rfbHextileExtractY(*ptr);
98  ptr++;
99  sw = rfbHextileExtractW(*ptr);
100  sh = rfbHextileExtractH(*ptr);
101  ptr++;
102 
103  FillRectangle(client, x+sx, y+sy, sw, sh, fg);
104  }
105 
106  } else {
107  if (!ReadFromRFBServer(client, client->buffer, nSubrects * 2))
108  return FALSE;
109 
110  for (i = 0; i < nSubrects; i++) {
111  sx = rfbHextileExtractX(*ptr);
112  sy = rfbHextileExtractY(*ptr);
113  ptr++;
114  sw = rfbHextileExtractW(*ptr);
115  sh = rfbHextileExtractH(*ptr);
116  ptr++;
117 
118  FillRectangle(client, x+sx, y+sy, sw, sh, fg);
119  }
120  }
121  }
122  }
123 
124  return TRUE;
125 }
126 
127 #undef CARDBPP