--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/com/glavsoft/rfb/encoding/decoder/HextileDecoder.java	Tue Jul 03 13:20:49 2012 +0900
@@ -0,0 +1,110 @@
+// Copyright (C) 2010, 2011 GlavSoft LLC.
+// All rights reserved.
+//
+//-------------------------------------------------------------------------
+// This file is part of the TightVNC software.  Please visit our Web site:
+//
+//                       http://www.tightvnc.com/
+//
+// This program 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 program 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 program; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//-------------------------------------------------------------------------
+//
+
+package com.glavsoft.rfb.encoding.decoder;
+
+import com.glavsoft.drawing.Renderer;
+import com.glavsoft.exceptions.TransportException;
+import com.glavsoft.transport.Reader;
+
+
+public class HextileDecoder extends Decoder {
+	private static final int DEFAULT_TILE_SIZE = 16;
+	private static final int RAW_MASK = 1;
+	private static final int BACKGROUND_SPECIFIED_MASK = 2;
+	private static final int FOREGROUND_SPECIFIED_MASK = 4;
+	private static final int ANY_SUBRECTS_MASK = 8;
+	private static final int SUBRECTS_COLOURED_MASK = 16;
+	private static final int FG_COLOR_INDEX = 0;
+	private static final int BG_COLOR_INDEX = 1;
+
+	@Override
+	public void decode(Reader reader, Renderer renderer,
+			FramebufferUpdateRectangle rect) throws TransportException {
+		if (rect.width == 0  || rect.height == 0) return;
+		int[] colors = new int[] {-1, -1};
+		int maxX = rect.x + rect.width;
+		int maxY = rect.y + rect.height;
+		for (int tileY = rect.y; tileY < maxY;
+		tileY += DEFAULT_TILE_SIZE) {
+			int tileHeight = Math.min(maxY - tileY, DEFAULT_TILE_SIZE);
+			for (int tileX = rect.x; tileX < maxX;
+			tileX += DEFAULT_TILE_SIZE) {
+				int tileWidth = Math.min(maxX - tileX, DEFAULT_TILE_SIZE);
+				decodeHextileSubrectangle(reader, renderer, colors, tileX,
+						tileY, tileWidth, tileHeight);
+			}
+		}
+
+	}
+
+	private void decodeHextileSubrectangle(Reader reader,
+			Renderer renderer, int[] colors,
+			int tileX, int tileY, int tileWidth, int tileHeight)
+			throws TransportException {
+
+		int subencoding = reader.readUInt8();
+
+		if ((subencoding & RAW_MASK) != 0) {
+			RawDecoder.getInstance().decode(reader, renderer,
+					tileX, tileY, tileWidth, tileHeight);
+			return;
+		}
+
+		if ((subencoding & BACKGROUND_SPECIFIED_MASK) != 0) {
+			colors[BG_COLOR_INDEX] = renderer.readPixelColor(reader);
+		}
+		assert colors[BG_COLOR_INDEX] != -1;
+		renderer.fillRect(colors[BG_COLOR_INDEX],
+				tileX, tileY, tileWidth, tileHeight);
+
+		if ((subencoding & FOREGROUND_SPECIFIED_MASK) != 0) {
+			colors[FG_COLOR_INDEX] = renderer.readPixelColor(reader);
+		}
+
+		if ((subencoding & ANY_SUBRECTS_MASK) == 0)
+			return;
+
+		int numberOfSubrectangles = reader.readUInt8();
+		boolean colorSpecified =
+			(subencoding & SUBRECTS_COLOURED_MASK) != 0;
+		for (int i = 0; i < numberOfSubrectangles; ++i) {
+			if (colorSpecified) {
+				colors[FG_COLOR_INDEX] = renderer.readPixelColor(reader);
+			}
+			byte dimensions = reader.readByte(); // bits 7-4 for x, bits 3-0 for y
+			int subtileX = dimensions >> 4 & 0x0f;
+			int subtileY = dimensions & 0x0f;
+			dimensions = reader.readByte(); // bits 7-4 for w, bits 3-0 for h
+			int subtileWidth = 1 + (dimensions >> 4 & 0x0f);
+			int subtileHeight = 1 + (dimensions & 0x0f);
+			assert colors[FG_COLOR_INDEX] != -1;
+			renderer.fillRect(colors[FG_COLOR_INDEX],
+					tileX + subtileX, tileY + subtileY,
+					subtileWidth, subtileHeight);
+		}
+	}
+
+
+}