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
HandleCursorShape(rfbClient * client,int xhot,int yhot,int width,int height,uint32_t enc)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
180