San Mehat | a430b2b | 2014-09-23 08:30:51 -0700 | [diff] [blame] | 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 | |