San Mehat | a430b2b | 2014-09-23 08:30:51 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2002 RealVNC Ltd. All Rights Reserved. |
| 3 | * Copyright (C) 2003 Sun Microsystems, Inc. |
| 4 | * |
| 5 | * This is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This software is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this software; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| 18 | * USA. |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | * zrle.c |
| 23 | * |
| 24 | * Routines to implement Zlib Run-length Encoding (ZRLE). |
| 25 | */ |
| 26 | |
| 27 | #include "rfb/rfb.h" |
| 28 | #include "private.h" |
| 29 | #include "zrleoutstream.h" |
| 30 | |
| 31 | |
| 32 | #define GET_IMAGE_INTO_BUF(tx,ty,tw,th,buf) \ |
| 33 | { char *fbptr = (cl->scaledScreen->frameBuffer \ |
| 34 | + (cl->scaledScreen->paddedWidthInBytes * ty) \ |
| 35 | + (tx * (cl->scaledScreen->bitsPerPixel / 8))); \ |
| 36 | \ |
| 37 | (*cl->translateFn)(cl->translateLookupTable, &cl->screen->serverFormat,\ |
| 38 | &cl->format, fbptr, (char*)buf, \ |
| 39 | cl->scaledScreen->paddedWidthInBytes, tw, th); } |
| 40 | |
| 41 | #define EXTRA_ARGS , rfbClientPtr cl |
| 42 | |
| 43 | #define ENDIAN_LITTLE 0 |
| 44 | #define ENDIAN_BIG 1 |
| 45 | #define ENDIAN_NO 2 |
| 46 | #define BPP 8 |
| 47 | #define ZYWRLE_ENDIAN ENDIAN_NO |
| 48 | #include <zrleencodetemplate.c> |
| 49 | #undef BPP |
| 50 | #define BPP 15 |
| 51 | #undef ZYWRLE_ENDIAN |
| 52 | #define ZYWRLE_ENDIAN ENDIAN_LITTLE |
| 53 | #include <zrleencodetemplate.c> |
| 54 | #undef ZYWRLE_ENDIAN |
| 55 | #define ZYWRLE_ENDIAN ENDIAN_BIG |
| 56 | #include <zrleencodetemplate.c> |
| 57 | #undef BPP |
| 58 | #define BPP 16 |
| 59 | #undef ZYWRLE_ENDIAN |
| 60 | #define ZYWRLE_ENDIAN ENDIAN_LITTLE |
| 61 | #include <zrleencodetemplate.c> |
| 62 | #undef ZYWRLE_ENDIAN |
| 63 | #define ZYWRLE_ENDIAN ENDIAN_BIG |
| 64 | #include <zrleencodetemplate.c> |
| 65 | #undef BPP |
| 66 | #define BPP 32 |
| 67 | #undef ZYWRLE_ENDIAN |
| 68 | #define ZYWRLE_ENDIAN ENDIAN_LITTLE |
| 69 | #include <zrleencodetemplate.c> |
| 70 | #undef ZYWRLE_ENDIAN |
| 71 | #define ZYWRLE_ENDIAN ENDIAN_BIG |
| 72 | #include <zrleencodetemplate.c> |
| 73 | #define CPIXEL 24A |
| 74 | #undef ZYWRLE_ENDIAN |
| 75 | #define ZYWRLE_ENDIAN ENDIAN_LITTLE |
| 76 | #include <zrleencodetemplate.c> |
| 77 | #undef ZYWRLE_ENDIAN |
| 78 | #define ZYWRLE_ENDIAN ENDIAN_BIG |
| 79 | #include <zrleencodetemplate.c> |
| 80 | #undef CPIXEL |
| 81 | #define CPIXEL 24B |
| 82 | #undef ZYWRLE_ENDIAN |
| 83 | #define ZYWRLE_ENDIAN ENDIAN_LITTLE |
| 84 | #include <zrleencodetemplate.c> |
| 85 | #undef ZYWRLE_ENDIAN |
| 86 | #define ZYWRLE_ENDIAN ENDIAN_BIG |
| 87 | #include <zrleencodetemplate.c> |
| 88 | #undef CPIXEL |
| 89 | #undef BPP |
| 90 | |
| 91 | |
| 92 | /* |
| 93 | * zrleBeforeBuf contains pixel data in the client's format. It must be at |
| 94 | * least one pixel bigger than the largest tile of pixel data, since the |
| 95 | * ZRLE encoding algorithm writes to the position one past the end of the pixel |
| 96 | * data. |
| 97 | */ |
| 98 | |
| 99 | |
| 100 | /* |
| 101 | * rfbSendRectEncodingZRLE - send a given rectangle using ZRLE encoding. |
| 102 | */ |
| 103 | |
| 104 | rfbBool rfbSendRectEncodingZRLE(rfbClientPtr cl, int x, int y, int w, int h) |
| 105 | { |
| 106 | zrleOutStream* zos; |
| 107 | rfbFramebufferUpdateRectHeader rect; |
| 108 | rfbZRLEHeader hdr; |
| 109 | int i; |
| 110 | char *zrleBeforeBuf; |
| 111 | |
| 112 | if (cl->zrleBeforeBuf == NULL) { |
| 113 | cl->zrleBeforeBuf = (char *) malloc(rfbZRLETileWidth * rfbZRLETileHeight * 4 + 4); |
| 114 | } |
| 115 | zrleBeforeBuf = cl->zrleBeforeBuf; |
| 116 | |
| 117 | if (cl->preferredEncoding == rfbEncodingZYWRLE) { |
| 118 | if (cl->tightQualityLevel < 0) { |
| 119 | cl->zywrleLevel = 1; |
| 120 | } else if (cl->tightQualityLevel < 3) { |
| 121 | cl->zywrleLevel = 3; |
| 122 | } else if (cl->tightQualityLevel < 6) { |
| 123 | cl->zywrleLevel = 2; |
| 124 | } else { |
| 125 | cl->zywrleLevel = 1; |
| 126 | } |
| 127 | } else |
| 128 | cl->zywrleLevel = 0; |
| 129 | |
| 130 | if (!cl->zrleData) |
| 131 | cl->zrleData = zrleOutStreamNew(); |
| 132 | zos = cl->zrleData; |
| 133 | zos->in.ptr = zos->in.start; |
| 134 | zos->out.ptr = zos->out.start; |
| 135 | |
| 136 | switch (cl->format.bitsPerPixel) { |
| 137 | |
| 138 | case 8: |
| 139 | zrleEncode8NE(x, y, w, h, zos, zrleBeforeBuf, cl); |
| 140 | break; |
| 141 | |
| 142 | case 16: |
| 143 | if (cl->format.greenMax > 0x1F) { |
| 144 | if (cl->format.bigEndian) |
| 145 | zrleEncode16BE(x, y, w, h, zos, zrleBeforeBuf, cl); |
| 146 | else |
| 147 | zrleEncode16LE(x, y, w, h, zos, zrleBeforeBuf, cl); |
| 148 | } else { |
| 149 | if (cl->format.bigEndian) |
| 150 | zrleEncode15BE(x, y, w, h, zos, zrleBeforeBuf, cl); |
| 151 | else |
| 152 | zrleEncode15LE(x, y, w, h, zos, zrleBeforeBuf, cl); |
| 153 | } |
| 154 | break; |
| 155 | |
| 156 | case 32: { |
| 157 | rfbBool fitsInLS3Bytes |
| 158 | = ((cl->format.redMax << cl->format.redShift) < (1<<24) && |
| 159 | (cl->format.greenMax << cl->format.greenShift) < (1<<24) && |
| 160 | (cl->format.blueMax << cl->format.blueShift) < (1<<24)); |
| 161 | |
| 162 | rfbBool fitsInMS3Bytes = (cl->format.redShift > 7 && |
| 163 | cl->format.greenShift > 7 && |
| 164 | cl->format.blueShift > 7); |
| 165 | |
| 166 | if ((fitsInLS3Bytes && !cl->format.bigEndian) || |
| 167 | (fitsInMS3Bytes && cl->format.bigEndian)) { |
| 168 | if (cl->format.bigEndian) |
| 169 | zrleEncode24ABE(x, y, w, h, zos, zrleBeforeBuf, cl); |
| 170 | else |
| 171 | zrleEncode24ALE(x, y, w, h, zos, zrleBeforeBuf, cl); |
| 172 | } |
| 173 | else if ((fitsInLS3Bytes && cl->format.bigEndian) || |
| 174 | (fitsInMS3Bytes && !cl->format.bigEndian)) { |
| 175 | if (cl->format.bigEndian) |
| 176 | zrleEncode24BBE(x, y, w, h, zos, zrleBeforeBuf, cl); |
| 177 | else |
| 178 | zrleEncode24BLE(x, y, w, h, zos, zrleBeforeBuf, cl); |
| 179 | } |
| 180 | else { |
| 181 | if (cl->format.bigEndian) |
| 182 | zrleEncode32BE(x, y, w, h, zos, zrleBeforeBuf, cl); |
| 183 | else |
| 184 | zrleEncode32LE(x, y, w, h, zos, zrleBeforeBuf, cl); |
| 185 | } |
| 186 | } |
| 187 | break; |
| 188 | } |
| 189 | |
| 190 | rfbStatRecordEncodingSent(cl, rfbEncodingZRLE, sz_rfbFramebufferUpdateRectHeader + sz_rfbZRLEHeader + ZRLE_BUFFER_LENGTH(&zos->out), |
| 191 | + w * (cl->format.bitsPerPixel / 8) * h); |
| 192 | |
| 193 | if (cl->ublen + sz_rfbFramebufferUpdateRectHeader + sz_rfbZRLEHeader |
| 194 | > UPDATE_BUF_SIZE) |
| 195 | { |
| 196 | if (!rfbSendUpdateBuf(cl)) |
| 197 | return FALSE; |
| 198 | } |
| 199 | |
| 200 | rect.r.x = Swap16IfLE(x); |
| 201 | rect.r.y = Swap16IfLE(y); |
| 202 | rect.r.w = Swap16IfLE(w); |
| 203 | rect.r.h = Swap16IfLE(h); |
| 204 | rect.encoding = Swap32IfLE(cl->preferredEncoding); |
| 205 | |
| 206 | memcpy(cl->updateBuf+cl->ublen, (char *)&rect, |
| 207 | sz_rfbFramebufferUpdateRectHeader); |
| 208 | cl->ublen += sz_rfbFramebufferUpdateRectHeader; |
| 209 | |
| 210 | hdr.length = Swap32IfLE(ZRLE_BUFFER_LENGTH(&zos->out)); |
| 211 | |
| 212 | memcpy(cl->updateBuf+cl->ublen, (char *)&hdr, sz_rfbZRLEHeader); |
| 213 | cl->ublen += sz_rfbZRLEHeader; |
| 214 | |
| 215 | /* copy into updateBuf and send from there. Maybe should send directly? */ |
| 216 | |
| 217 | for (i = 0; i < ZRLE_BUFFER_LENGTH(&zos->out);) { |
| 218 | |
| 219 | int bytesToCopy = UPDATE_BUF_SIZE - cl->ublen; |
| 220 | |
| 221 | if (i + bytesToCopy > ZRLE_BUFFER_LENGTH(&zos->out)) { |
| 222 | bytesToCopy = ZRLE_BUFFER_LENGTH(&zos->out) - i; |
| 223 | } |
| 224 | |
| 225 | memcpy(cl->updateBuf+cl->ublen, (uint8_t*)zos->out.start + i, bytesToCopy); |
| 226 | |
| 227 | cl->ublen += bytesToCopy; |
| 228 | i += bytesToCopy; |
| 229 | |
| 230 | if (cl->ublen == UPDATE_BUF_SIZE) { |
| 231 | if (!rfbSendUpdateBuf(cl)) |
| 232 | return FALSE; |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | return TRUE; |
| 237 | } |
| 238 | |
| 239 | |
| 240 | void rfbFreeZrleData(rfbClientPtr cl) |
| 241 | { |
| 242 | if (cl->zrleData) { |
| 243 | zrleOutStreamFree(cl->zrleData); |
| 244 | } |
| 245 | cl->zrleData = NULL; |
| 246 | |
| 247 | if (cl->zrleBeforeBuf) { |
| 248 | free(cl->zrleBeforeBuf); |
| 249 | } |
| 250 | cl->zrleBeforeBuf = NULL; |
| 251 | |
| 252 | if (cl->paletteHelper) { |
| 253 | free(cl->paletteHelper); |
| 254 | } |
| 255 | cl->paletteHelper = NULL; |
| 256 | } |
| 257 | |