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 } 178 179 180
