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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.
- */
- //
- // Hextile decoding function.
- //
- // This file is #included after having set the following macro:
- // BPP - 8, 16 or 32
-
- #include <rdr/InStream.h>
- #include <rfb/Exception.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 READ_PIXEL CONCAT2E(readOpaque,BPP)
- #define HEXTILE_DECODE CONCAT2E(hextileDecode,BPP)
-
- static void HEXTILE_DECODE (const Rect& r, rdr::InStream* is,
- const PixelFormat& pf,
- ModifiablePixelBuffer* pb)
- {
- Rect t;
- PIXEL_T bg = 0;
- PIXEL_T fg = 0;
- PIXEL_T buf[16 * 16];
-
- for (t.tl.y = r.tl.y; t.tl.y < r.br.y; t.tl.y += 16) {
-
- t.br.y = __rfbmin(r.br.y, t.tl.y + 16);
-
- for (t.tl.x = r.tl.x; t.tl.x < r.br.x; t.tl.x += 16) {
-
- t.br.x = __rfbmin(r.br.x, t.tl.x + 16);
-
- int tileType = is->readU8();
-
- if (tileType & hextileRaw) {
- is->readBytes(buf, t.area() * (BPP/8));
- pb->imageRect(pf, t, buf);
- continue;
- }
-
- if (tileType & hextileBgSpecified)
- bg = is->READ_PIXEL();
-
- int len = t.area();
- PIXEL_T* ptr = buf;
- while (len-- > 0) *ptr++ = bg;
-
- if (tileType & hextileFgSpecified)
- fg = is->READ_PIXEL();
-
- if (tileType & hextileAnySubrects) {
- int nSubrects = is->readU8();
-
- for (int i = 0; i < nSubrects; i++) {
-
- if (tileType & hextileSubrectsColoured)
- fg = is->READ_PIXEL();
-
- int xy = is->readU8();
- int wh = is->readU8();
-
- int x = ((xy >> 4) & 15);
- int y = (xy & 15);
- int w = ((wh >> 4) & 15) + 1;
- int h = (wh & 15) + 1;
- if (x + w > 16 || y + h > 16) {
- throw rfb::Exception("HEXTILE_DECODE: Hextile out of bounds");
- }
- PIXEL_T* ptr = buf + y * t.width() + x;
- int rowAdd = t.width() - w;
- while (h-- > 0) {
- int len = w;
- while (len-- > 0) *ptr++ = fg;
- ptr += rowAdd;
- }
- }
- }
- pb->imageRect(pf, t, buf);
- }
- }
- }
-
- #undef PIXEL_T
- #undef READ_PIXEL
- #undef HEXTILE_DECODE
- }
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