From 018dd5de6039b92db1edf1ea66109927c8dba273 Mon Sep 17 00:00:00 2001
From: enikey <enikey@3789f03b-4d11-0410-bbf8-ca57d06f2519>
Date: Fri, 19 Dec 2008 07:27:01 +0000
Subject: [PATCH] [Developement] Added decoding methods to hextile data decoder
 class.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@3427 3789f03b-4d11-0410-bbf8-ca57d06f2519
---
 .../com/tightvnc/decoder/HextileDecoder.java  | 168 +++++++++++++++++-
 1 file changed, 167 insertions(+), 1 deletion(-)

diff --git a/java/src/com/tightvnc/decoder/HextileDecoder.java b/java/src/com/tightvnc/decoder/HextileDecoder.java
index 6cc17d7b..adf59370 100644
--- a/java/src/com/tightvnc/decoder/HextileDecoder.java
+++ b/java/src/com/tightvnc/decoder/HextileDecoder.java
@@ -4,6 +4,7 @@ import com.tightvnc.decoder.common.Repaintable;
 import com.tightvnc.vncviewer.RfbInputStream;
 import java.awt.Color;
 import java.awt.Graphics;
+import java.io.IOException;
 
 //
 // Class that used for decoding hextile encoded data.
@@ -36,9 +37,174 @@ public class HextileDecoder extends RawDecoder {
     repainableControl = r;
   }
 
+  //
+  // Override handleRect method to decode Hextile encoded data insted of
+  // raw pixel data.
+  //
+
+  public void handleRect(int x, int y, int w, int h) throws IOException,
+                                                            Exception {
+    hextile_bg = new Color(0);
+    hextile_fg = new Color(0);
+
+    for (int ty = y; ty < y + h; ty += 16) {
+      int th = 16;
+      if (y + h - ty < 16)
+        th = y + h - ty;
+
+      for (int tx = x; tx < x + w; tx += 16) {
+        int tw = 16;
+        if (x + w - tx < 16)
+          tw = x + w - tx;
+
+        handleHextileSubrect(tx, ty, tw, th);
+      }
+      if (repainableControl != null)
+        repainableControl.scheduleRepaint(x, y, w, h);
+    }
+    if (repainableControl != null)
+      repainableControl.scheduleRepaint(x, y, w, h);
+  }
+
+  //
+  // Handle one tile in the Hextile-encoded data.
+  //
+
+  private void handleHextileSubrect(int tx, int ty, int tw, int th)
+    throws IOException, Exception {
+
+    int subencoding = rfbis.readU8();
+
+    //
+    // Save decoded data to RecordInterface
+    //
+
+    if (rec.canWrite()) {
+      rec.writeByte((byte)subencoding);
+    }
+
+    // Is it a raw-encoded sub-rectangle?
+    if ((subencoding & HextileRaw) != 0) {
+      //handleRawRect(tx, ty, tw, th, false);
+      super.handleRect(tx, ty, tw, th);
+      super.handleUpdatedPixels(tx, ty, tw, th);
+      return;
+    }
+
+    // Read and draw the background if specified.
+    byte[] cbuf = new byte[bytesPerPixel];
+    if ((subencoding & HextileBackgroundSpecified) != 0) {
+      rfbis.readFully(cbuf);
+      if (bytesPerPixel == 1) {
+        hextile_bg = getColor256()[cbuf[0] & 0xFF];
+      } else {
+        hextile_bg = new Color(cbuf[2] & 0xFF, cbuf[1] & 0xFF, cbuf[0] & 0xFF);
+      }
+
+      //
+      // Save decoded data to RecordInterface
+      //
+
+      if (rec.canWrite()) {
+        rec.write(cbuf);
+      }
+    }
+    graphics.setColor(hextile_bg);
+    graphics.fillRect(tx, ty, tw, th);
+
+    // Read the foreground color if specified.
+    if ((subencoding & HextileForegroundSpecified) != 0) {
+      rfbis.readFully(cbuf);
+      if (bytesPerPixel == 1) {
+        hextile_fg = getColor256()[cbuf[0] & 0xFF];
+      } else {
+        hextile_fg = new Color(cbuf[2] & 0xFF, cbuf[1] & 0xFF, cbuf[0] & 0xFF);
+      }
+
+      //
+      // Save decoded data to RecordInterface
+      //
+
+      if (rec.canWrite()) {
+        rec.write(cbuf);
+      }
+    }
+
+    // Done with this tile if there is no sub-rectangles.
+    if ((subencoding & HextileAnySubrects) == 0)
+      return;
+
+    int nSubrects = rfbis.readU8();
+    int bufsize = nSubrects * 2;
+    if ((subencoding & HextileSubrectsColoured) != 0) {
+      bufsize += nSubrects * bytesPerPixel;
+    }
+    byte[] buf = new byte[bufsize];
+    rfbis.readFully(buf);
+
+    //
+    // Save decoded data to RecordInterface
+    //
+
+    if (rec.canWrite()) {
+      rec.writeByte((byte)nSubrects);
+      rec.write(buf);
+    }
+
+    int b1, b2, sx, sy, sw, sh;
+    int i = 0;
+
+    if ((subencoding & HextileSubrectsColoured) == 0) {
+
+      // Sub-rectangles are all of the same color.
+      graphics.setColor(hextile_fg);
+      for (int j = 0; j < nSubrects; j++) {
+        b1 = buf[i++] & 0xFF;
+        b2 = buf[i++] & 0xFF;
+        sx = tx + (b1 >> 4);
+        sy = ty + (b1 & 0xf);
+        sw = (b2 >> 4) + 1;
+        sh = (b2 & 0xf) + 1;
+        graphics.fillRect(sx, sy, sw, sh);
+      }
+    } else if (bytesPerPixel == 1) {
+
+      // BGR233 (8-bit color) version for colored sub-rectangles.
+      for (int j = 0; j < nSubrects; j++) {
+        hextile_fg = getColor256()[buf[i++] & 0xFF];
+        b1 = buf[i++] & 0xFF;
+        b2 = buf[i++] & 0xFF;
+        sx = tx + (b1 >> 4);
+        sy = ty + (b1 & 0xf);
+        sw = (b2 >> 4) + 1;
+        sh = (b2 & 0xf) + 1;
+        graphics.setColor(hextile_fg);
+        graphics.fillRect(sx, sy, sw, sh);
+      }
+
+    } else {
+
+      // Full-color (24-bit) version for colored sub-rectangles.
+      for (int j = 0; j < nSubrects; j++) {
+        hextile_fg = new Color(buf[i+2] & 0xFF,
+                               buf[i+1] & 0xFF,
+                               buf[i] & 0xFF);
+        i += 4;
+        b1 = buf[i++] & 0xFF;
+        b2 = buf[i++] & 0xFF;
+        sx = tx + (b1 >> 4);
+        sy = ty + (b1 & 0xf);
+        sw = (b2 >> 4) + 1;
+        sh = (b2 & 0xf) + 1;
+        graphics.setColor(hextile_fg);
+        graphics.fillRect(sx, sy, sw, sh);
+      }
+
+    }
+  }
+
   // These colors should be kept between handleHextileSubrect() calls.
   private Color hextile_bg, hextile_fg;
   // Repaitable object
   private Repaintable repainableControl = null;
-
 }
-- 
2.39.5