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- /* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
- * USA.
- */
- //
- // RRE encoding function.
- //
- // This file is #included after having set the following macro:
- // BPP - 8, 16 or 32
- //
- // The data argument to RRE_ENCODE contains the pixel data, and it writes the
- // encoded version to the given OutStream. If the encoded version exceeds w*h
- // it aborts and returns -1, otherwise it returns the number of subrectangles.
- //
-
- #include <rdr/OutStream.h>
-
- namespace rfb {
-
- // CONCAT2E concatenates its arguments, expanding them if they are macros
-
- #ifndef CONCAT2E
- #define CONCAT2(a,b) a##b
- #define CONCAT2E(a,b) CONCAT2(a,b)
- #endif
-
- #define PIXEL_T rdr::CONCAT2E(U,BPP)
- #define WRITE_PIXEL CONCAT2E(writeOpaque,BPP)
- #define RRE_ENCODE CONCAT2E(rreEncode,BPP)
-
- int RRE_ENCODE (PIXEL_T* data, int w, int h, rdr::OutStream* os, PIXEL_T bg)
- {
- os->WRITE_PIXEL(bg);
-
- int nSubrects = 0;
-
- for (int y = 0; y < h; y++)
- {
- int x = 0;
- while (x < w) {
- if (*data == bg) {
- x++;
- data++;
- continue;
- }
-
- // Find horizontal subrect first
- PIXEL_T* ptr = data+1;
- PIXEL_T* eol = data+w-x;
- while (ptr < eol && *ptr == *data) ptr++;
- int sw = ptr - data;
-
- ptr = data + w;
- int sh = 1;
- while (sh < h-y) {
- eol = ptr + sw;
- while (ptr < eol)
- if (*ptr++ != *data) goto endOfHorizSubrect;
- ptr += w - sw;
- sh++;
- }
- endOfHorizSubrect:
-
- // Find vertical subrect
- int vh;
- for (vh = sh; vh < h-y; vh++)
- if (data[vh*w] != *data) break;
-
- if (vh != sh) {
- ptr = data+1;
- int vw;
- for (vw = 1; vw < sw; vw++) {
- for (int i = 0; i < vh; i++)
- if (ptr[i*w] != *data) goto endOfVertSubrect;
- ptr++;
- }
- endOfVertSubrect:
-
- // If vertical subrect bigger than horizontal then use that.
- if (sw*sh < vw*vh) {
- sw = vw;
- sh = vh;
- }
- }
-
- nSubrects++;
- os->WRITE_PIXEL(*data);
- os->writeU16(x);
- os->writeU16(y);
- os->writeU16(sw);
- os->writeU16(sh);
-
- ptr = data+w;
- PIXEL_T* eor = data+w*sh;
- while (ptr < eor) {
- eol = ptr + sw;
- while (ptr < eol) *ptr++ = bg;
- ptr += w - sw;
- }
- x += sw;
- data += sw;
- }
- }
-
- return nSubrects;
- }
-
- #undef PIXEL_T
- #undef WRITE_PIXEL
- #undef RRE_ENCODE
- }
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