- /* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
- * Copyright (C) 2005 Constantin Kaplinsky. 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.
- */
- //
- // Hextile encoding function.
- //
- // This file is #included after having set the following macro:
- // BPP - 8, 16 or 32
-
- #include <rdr/OutStream.h>
- #include <rfb/hextileConstants.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 HEXTILE_ENCODE CONCAT2E(hextileEncode,BPP)
- #define HEXTILE_ENCODE_TILE CONCAT2E(hextileEncodeTile,BPP)
- #define TEST_TILE_TYPE CONCAT2E(hextileTestTileType,BPP)
-
- int TEST_TILE_TYPE (PIXEL_T* data, int w, int h, PIXEL_T* bg, PIXEL_T* fg);
- int HEXTILE_ENCODE_TILE (PIXEL_T* data, int w, int h, int tileType,
- rdr::U8* encoded, PIXEL_T bg);
-
- void HEXTILE_ENCODE(rdr::OutStream* os, const PixelBuffer* pb)
- {
- Rect t;
- PIXEL_T buf[256];
- PIXEL_T oldBg = 0, oldFg = 0;
- bool oldBgValid = false;
- bool oldFgValid = false;
- rdr::U8 encoded[256*(BPP/8)];
-
- for (t.tl.y = 0; t.tl.y < pb->height(); t.tl.y += 16) {
-
- t.br.y = __rfbmin(pb->height(), t.tl.y + 16);
-
- for (t.tl.x = 0; t.tl.x < pb->width(); t.tl.x += 16) {
-
- t.br.x = __rfbmin(pb->width(), t.tl.x + 16);
-
- pb->getImage(buf, t);
-
- PIXEL_T bg = 0, fg = 0;
- int tileType = TEST_TILE_TYPE(buf, t.width(), t.height(), &bg, &fg);
-
- if (!oldBgValid || oldBg != bg) {
- tileType |= hextileBgSpecified;
- oldBg = bg;
- oldBgValid = true;
- }
-
- int encodedLen = 0;
-
- if (tileType & hextileAnySubrects) {
-
- if (tileType & hextileSubrectsColoured) {
- oldFgValid = false;
- } else {
- if (!oldFgValid || oldFg != fg) {
- tileType |= hextileFgSpecified;
- oldFg = fg;
- oldFgValid = true;
- }
- }
-
- encodedLen = HEXTILE_ENCODE_TILE(buf, t.width(), t.height(), tileType,
- encoded, bg);
-
- if (encodedLen < 0) {
- pb->getImage(buf, t);
- os->writeU8(hextileRaw);
- os->writeBytes(buf, t.width() * t.height() * (BPP/8));
- oldBgValid = oldFgValid = false;
- continue;
- }
- }
-
- os->writeU8(tileType);
- if (tileType & hextileBgSpecified) os->WRITE_PIXEL(bg);
- if (tileType & hextileFgSpecified) os->WRITE_PIXEL(fg);
- if (tileType & hextileAnySubrects) os->writeBytes(encoded, encodedLen);
- }
- }
- }
-
-
- int HEXTILE_ENCODE_TILE (PIXEL_T* data, int w, int h, int tileType,
- rdr::U8* encoded, PIXEL_T bg)
- {
- rdr::U8* nSubrectsPtr = encoded;
- *nSubrectsPtr = 0;
- encoded++;
-
- 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 endOfSubrect;
- ptr += w - sw;
- sh++;
- }
- endOfSubrect:
-
- (*nSubrectsPtr)++;
-
- if (tileType & hextileSubrectsColoured) {
- if (encoded - nSubrectsPtr + (BPP/8) > w*h*(BPP/8)) return -1;
- #if (BPP == 8)
- *encoded++ = *data;
- #elif (BPP == 16)
- *encoded++ = ((rdr::U8*)data)[0];
- *encoded++ = ((rdr::U8*)data)[1];
- #elif (BPP == 32)
- *encoded++ = ((rdr::U8*)data)[0];
- *encoded++ = ((rdr::U8*)data)[1];
- *encoded++ = ((rdr::U8*)data)[2];
- *encoded++ = ((rdr::U8*)data)[3];
- #endif
- }
-
- if (encoded - nSubrectsPtr + 2 > w*h*(BPP/8)) return -1;
- *encoded++ = (x << 4) | y;
- *encoded++ = ((sw-1) << 4) | (sh-1);
-
- 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 encoded - nSubrectsPtr;
- }
-
-
- int TEST_TILE_TYPE (PIXEL_T* data, int w, int h, PIXEL_T* bg, PIXEL_T* fg)
- {
- PIXEL_T pix1 = *data;
- PIXEL_T* end = data + w * h;
-
- PIXEL_T* ptr = data + 1;
- while (ptr < end && *ptr == pix1)
- ptr++;
-
- if (ptr == end) {
- *bg = pix1;
- return 0; // solid-color tile
- }
-
- int count1 = ptr - data;
- int count2 = 1;
- PIXEL_T pix2 = *ptr++;
- int tileType = hextileAnySubrects;
-
- for (; ptr < end; ptr++) {
- if (*ptr == pix1) {
- count1++;
- } else if (*ptr == pix2) {
- count2++;
- } else {
- tileType |= hextileSubrectsColoured;
- break;
- }
- }
-
- if (count1 >= count2) {
- *bg = pix1; *fg = pix2;
- } else {
- *bg = pix2; *fg = pix1;
- }
- return tileType;
- }
-
- #undef PIXEL_T
- #undef WRITE_PIXEL
- #undef HEXTILE_ENCODE
- #undef HEXTILE_ENCODE_TILE
- #undef TEST_TILE_TYPE
- }
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