From 47d455dd55be855e4cc691c32f687f723d9247ee Mon Sep 17 00:00:00 2001
From: toma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>
Date: Wed, 25 Nov 2009 17:56:58 +0000
Subject: Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
 BUG:215923

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdegraphics@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
---
 kviewshell/plugins/djvu/libdjvu/GBitmap.cpp | 1658 +++++++++++++++++++++++++++
 1 file changed, 1658 insertions(+)
 create mode 100644 kviewshell/plugins/djvu/libdjvu/GBitmap.cpp

(limited to 'kviewshell/plugins/djvu/libdjvu/GBitmap.cpp')

diff --git a/kviewshell/plugins/djvu/libdjvu/GBitmap.cpp b/kviewshell/plugins/djvu/libdjvu/GBitmap.cpp
new file mode 100644
index 00000000..696367e7
--- /dev/null
+++ b/kviewshell/plugins/djvu/libdjvu/GBitmap.cpp
@@ -0,0 +1,1658 @@
+//C-  -*- C++ -*-
+//C- -------------------------------------------------------------------
+//C- DjVuLibre-3.5
+//C- Copyright (c) 2002  Leon Bottou and Yann Le Cun.
+//C- Copyright (c) 2001  AT&T
+//C-
+//C- This software is subject to, and may be distributed under, the
+//C- GNU General Public License, Version 2. The license should have
+//C- accompanied the software or you may obtain a copy of the license
+//C- from the Free Software Foundation at http://www.fsf.org .
+//C-
+//C- This program is distributed in the hope that it will be useful,
+//C- but WITHOUT ANY WARRANTY; without even the implied warranty of
+//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//C- GNU General Public License for more details.
+//C- 
+//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library
+//C- distributed by Lizardtech Software.  On July 19th 2002, Lizardtech 
+//C- Software authorized us to replace the original DjVu(r) Reference 
+//C- Library notice by the following text (see doc/lizard2002.djvu):
+//C-
+//C-  ------------------------------------------------------------------
+//C- | DjVu (r) Reference Library (v. 3.5)
+//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.
+//C- | The DjVu Reference Library is protected by U.S. Pat. No.
+//C- | 6,058,214 and patents pending.
+//C- |
+//C- | This software is subject to, and may be distributed under, the
+//C- | GNU General Public License, Version 2. The license should have
+//C- | accompanied the software or you may obtain a copy of the license
+//C- | from the Free Software Foundation at http://www.fsf.org .
+//C- |
+//C- | The computer code originally released by LizardTech under this
+//C- | license and unmodified by other parties is deemed "the LIZARDTECH
+//C- | ORIGINAL CODE."  Subject to any third party intellectual property
+//C- | claims, LizardTech grants recipient a worldwide, royalty-free, 
+//C- | non-exclusive license to make, use, sell, or otherwise dispose of 
+//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the 
+//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU 
+//C- | General Public License.   This grant only confers the right to 
+//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to 
+//C- | the extent such infringement is reasonably necessary to enable 
+//C- | recipient to make, have made, practice, sell, or otherwise dispose 
+//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to 
+//C- | any greater extent that may be necessary to utilize further 
+//C- | modifications or combinations.
+//C- |
+//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
+//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
+//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+//C- +------------------------------------------------------------------
+// 
+// $Id: GBitmap.cpp,v 1.10 2004/04/17 23:56:11 leonb Exp $
+// $Name: release_3_5_15 $
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+#if NEED_GNUG_PRAGMAS
+# pragma implementation
+#endif
+
+#include "GBitmap.h"
+#include "ByteStream.h"
+#include "GRect.h"
+#include "GString.h"
+#include "GThreads.h"
+#include "GException.h"
+#include <string.h>
+
+// File "$Id: GBitmap.cpp,v 1.10 2004/04/17 23:56:11 leonb Exp $"
+// - Author: Leon Bottou, 05/1997
+
+
+#ifdef HAVE_NAMESPACES
+namespace DJVU {
+# ifdef NOT_DEFINED // Just to fool emacs c++ mode
+}
+#endif
+#endif
+
+// ----- constructor and destructor
+
+GBitmap::~GBitmap()
+{
+}
+
+void
+GBitmap::destroy(void)
+{
+  gbytes_data.resize(0);
+  bytes = 0;
+  grle.resize(0);
+  grlerows.resize(0);
+  rlelength = 0;
+}
+
+GBitmap::GBitmap()
+  : nrows(0), ncolumns(0), border(0), 
+    bytes_per_row(0), grays(0), bytes(0), gbytes_data(bytes_data), 
+    grle(rle), grlerows(rlerows), rlelength(0),
+    monitorptr(0)
+{
+}
+
+GBitmap::GBitmap(int nrows, int ncolumns, int border)
+  : nrows(0), ncolumns(0), border(0), 
+    bytes_per_row(0), grays(0), bytes(0), gbytes_data(bytes_data), 
+    grle(rle), grlerows(rlerows), rlelength(0),
+    monitorptr(0)
+{
+  G_TRY
+  { 
+    init(nrows, ncolumns, border);
+  }
+  G_CATCH_ALL
+  {
+    destroy();
+    G_RETHROW;
+  }
+  G_ENDCATCH;
+}
+
+GBitmap::GBitmap(ByteStream &ref, int border)
+  : nrows(0), ncolumns(0), border(0), 
+    bytes_per_row(0), grays(0), bytes(0), gbytes_data(bytes_data),
+    grle(rle), grlerows(rlerows), rlelength(0),
+    monitorptr(0)
+{
+  G_TRY
+  { 
+    init(ref, border);
+  }
+  G_CATCH_ALL
+  {
+    destroy();
+    G_RETHROW;
+  }
+  G_ENDCATCH;
+}
+
+GBitmap::GBitmap(const GBitmap &ref)
+  : nrows(0), ncolumns(0), border(0), 
+    bytes_per_row(0), grays(0), bytes(0), gbytes_data(bytes_data), 
+    grle(rle), grlerows(rlerows), rlelength(0),
+    monitorptr(0)
+{
+  G_TRY
+  { 
+    init(ref, ref.border);
+  }
+  G_CATCH_ALL
+  {
+    destroy();
+    G_RETHROW;
+  }
+  G_ENDCATCH;
+}
+
+GBitmap::GBitmap(const GBitmap &ref, int border)
+  : nrows(0), ncolumns(0), border(0), 
+    bytes_per_row(0), grays(0), bytes(0), gbytes_data(bytes_data),
+    grle(rle), grlerows(rlerows), rlelength(0),
+    monitorptr(0)
+{
+  G_TRY
+  { 
+    init(ref, border);
+  }
+  G_CATCH_ALL
+  {
+    destroy();
+    G_RETHROW;
+  }
+  G_ENDCATCH;
+}
+
+
+GBitmap::GBitmap(const GBitmap &ref, const GRect &rect, int border)
+  : nrows(0), ncolumns(0), border(0), 
+    bytes_per_row(0), grays(0), bytes(0), gbytes_data(bytes_data),
+    grle(rle), grlerows(rlerows), rlelength(0),
+    monitorptr(0)
+{
+  G_TRY
+  { 
+    init(ref, rect, border);
+  }
+  G_CATCH_ALL
+  {
+    destroy();
+    G_RETHROW;
+  }
+  G_ENDCATCH;
+}
+
+
+
+
+
+
+// ----- initialization
+
+void 
+GBitmap::init(int arows, int acolumns, int aborder)
+{
+  GMonitorLock lock(monitor());
+  destroy();
+  grays = 2;
+  nrows = arows;
+  ncolumns = acolumns;
+  border = aborder;
+  bytes_per_row = ncolumns + border;
+  int npixels = nrows * bytes_per_row + border;
+  gzerobuffer=zeroes(bytes_per_row + border);
+  if (npixels > 0) 
+    {
+      gbytes_data.resize(npixels);
+      gbytes_data.clear();
+      bytes = bytes_data;
+    }
+}
+
+
+void 
+GBitmap::init(const GBitmap &ref, int aborder)
+{
+  GMonitorLock lock(monitor());
+  if (this != &ref) 
+    {
+      GMonitorLock lock(ref.monitor());
+      init(ref.nrows, ref.ncolumns, aborder);
+      grays = ref.grays;
+      unsigned char *row = bytes_data+border;
+      for (int n=0; n<nrows; n++, row+=bytes_per_row)
+      memcpy( (void*)row, (void*)ref[n],  ncolumns );
+    }
+  else if (aborder > border)
+    {
+      minborder(aborder);
+    }
+}
+
+
+void 
+GBitmap::init(const GBitmap &ref, const GRect &rect, int border)
+{
+  GMonitorLock lock(monitor());
+  // test bitmap physical equality
+  if (this == &ref)
+    {
+      GBitmap tmp;
+      tmp.grays = grays;
+      tmp.border = border;
+      tmp.bytes_per_row = bytes_per_row;
+      tmp.ncolumns = ncolumns;
+      tmp.nrows = nrows;
+      tmp.bytes = bytes;
+      tmp.gbytes_data.swap(gbytes_data);
+      tmp.grle.swap(grle);
+      bytes = 0 ;
+      init(tmp, rect, border);
+    }
+  else
+    {
+      GMonitorLock lock(ref.monitor());
+      // create empty bitmap
+      init(rect.height(), rect.width(), border);
+      grays = ref.grays;
+      // compute destination rectangle
+      GRect rect2(0, 0, ref.columns(), ref.rows() );
+      rect2.intersect(rect2, rect);
+      rect2.translate(-rect.xmin, -rect.ymin);
+      // copy bits
+      if (! rect2.isempty())
+        {
+          for (int y=rect2.ymin; y<rect2.ymax; y++)
+            {
+              unsigned char *dst = (*this)[y];
+              const unsigned char *src = ref[y+rect.ymin] + rect.xmin;
+              for (int x=rect2.xmin; x<rect2.xmax; x++)
+                dst[x] = src[x];
+            }
+        }
+    }
+}
+
+
+void 
+GBitmap::init(ByteStream &ref, int aborder)
+{
+  GMonitorLock lock(monitor());
+  // Get magic number
+  char magic[2];
+  magic[0] = magic[1] = 0;
+  ref.readall((void*)magic, sizeof(magic));
+  char lookahead = '\n';
+  int acolumns = read_integer(lookahead, ref);
+  int arows = read_integer(lookahead, ref);
+  init(arows, acolumns, aborder);
+  // go reading file
+  if (magic[0]=='P')
+    {
+      switch(magic[1])
+        {
+        case '1':
+          grays = 2;
+          read_pbm_text(ref); 
+          return;
+        case '2':
+          grays = 1 + read_integer(lookahead, ref);
+          if (grays > 256)
+            G_THROW("Cannot read PGM with depth greater than 8 bits.");
+          read_pgm_text(ref); 
+          return;
+        case '4':
+          grays = 2;
+          read_pbm_raw(ref); 
+          return;
+        case '5':
+          grays = 1 + read_integer(lookahead, ref);
+          if (grays > 256)
+            grays = 256;
+          read_pgm_raw(ref); 
+          return;
+        }
+    }
+  else if (magic[0]=='R')
+    {
+      switch(magic[1])
+        {
+        case '4':
+          grays = 2;
+          read_rle_raw(ref); 
+          return;
+        }
+    }
+  G_THROW( ERR_MSG("GBitmap.bad_format") );
+}
+
+void
+GBitmap::donate_data(unsigned char *data, int w, int h)
+{
+  destroy();
+  grays = 2;
+  nrows = h;
+  ncolumns = w;
+  border = 0;
+  bytes_per_row = w;
+  gbytes_data.replace(data,w*h);
+  bytes = bytes_data;
+  rlelength = 0;
+}
+
+void
+GBitmap::donate_rle(unsigned char *rledata, unsigned int rledatalen, int w, int h)
+{
+  destroy();
+  grays = 2;
+  nrows = h;
+  ncolumns = w;
+  border = 0;
+  bytes_per_row = w;
+//  rle = rledata;
+  grle.replace(rledata,rledatalen);
+  rlelength = rledatalen;
+}
+
+
+unsigned char *
+GBitmap::take_data(size_t &offset)
+{
+  GMonitorLock lock(monitor());
+  unsigned char *ret = bytes_data;
+  if (ret) offset = (size_t)border;
+  bytes_data=0;
+  return ret;
+}
+
+const unsigned char *
+GBitmap::get_rle(unsigned int &rle_length)
+{
+  if(!rle)
+    compress();
+  rle_length=rlelength;
+  return rle; 
+}
+
+// ----- compression
+
+
+void 
+GBitmap::compress()
+{
+  if (grays > 2)
+    G_THROW( ERR_MSG("GBitmap.cant_compress") );
+  GMonitorLock lock(monitor());
+  if (bytes)
+    {
+      grle.resize(0);
+      grlerows.resize(0);
+      rlelength = encode(rle,grle);
+      if (rlelength)
+        {
+          gbytes_data.resize(0);
+          bytes = 0;
+        }
+    }
+}
+
+void
+GBitmap::uncompress()
+{
+  GMonitorLock lock(monitor());
+  if (!bytes && rle)
+    decode(rle);
+}
+
+
+
+unsigned int 
+GBitmap::get_memory_usage() const
+{
+  unsigned long usage = sizeof(GBitmap);
+  if (bytes)
+    usage += nrows * bytes_per_row + border;
+  if (rle)
+    usage += rlelength;
+  return usage;
+}
+
+
+void 
+GBitmap::minborder(int minimum)
+{
+  if (border < minimum)
+    {
+      GMonitorLock lock(monitor());
+      if (border < minimum)
+        {
+          if (bytes)
+            {
+              GBitmap tmp(*this, minimum);
+              bytes_per_row = tmp.bytes_per_row;
+              tmp.gbytes_data.swap(gbytes_data);
+              bytes = bytes_data;
+              tmp.bytes = 0;
+            }
+          border = minimum;
+          gzerobuffer=zeroes(border + ncolumns + border);
+        }
+    }
+}
+
+
+#define NMONITORS 8
+static GMonitor monitors[NMONITORS];
+
+void
+GBitmap::share()
+{
+  if (!monitorptr)
+    {
+      unsigned long x = (unsigned long)this;
+      monitorptr = &monitors[(x^(x>>5)) % NMONITORS];
+    }
+}
+
+
+// ----- gray levels
+
+void
+GBitmap::set_grays(int ngrays)
+{
+  if (ngrays<2 || ngrays>256)
+    G_THROW( ERR_MSG("GBitmap.bad_levels") );
+  // set gray levels
+  GMonitorLock lock(monitor());
+  grays = ngrays;
+  if (ngrays>2 && !bytes)
+    uncompress();
+}
+
+void 
+GBitmap::change_grays(int ngrays)
+{
+  GMonitorLock lock(monitor());
+  // set number of grays
+  int ng = ngrays - 1;
+  int og = grays - 1;
+  set_grays(ngrays);
+  // setup conversion table
+  unsigned char conv[256];
+  for (int i=0; i<256; i++)
+    {
+      if (i > og)
+        conv[i] = ng;
+      else
+        conv[i] = (i*ng+og/2)/og;
+    }
+  // perform conversion
+  for (int row=0; row<nrows; row++)
+    {
+      unsigned char *p = (*this)[row];
+      for (int n=0; n<ncolumns; n++)
+        p[n] = conv[ p[n] ];
+    }
+}
+
+void 
+GBitmap::binarize_grays(int threshold)
+{
+  GMonitorLock lock(monitor());
+  if (bytes)
+    for (int row=0; row<nrows; row++)
+      {
+        unsigned char *p = (*this)[row];
+        for(unsigned char const * const pend=p+ncolumns;p<pend;++p)
+        {
+          *p = (*p>threshold) ? 1 : 0;
+        }
+      }
+  grays = 2;
+}
+
+
+// ----- additive blitting
+
+#undef min
+#undef max
+
+static inline int
+min(int x, int y) 
+{ 
+  return (x < y ? x : y);
+}
+
+static inline int
+max(int x, int y) 
+{ 
+  return (x > y ? x : y);
+}
+
+void 
+GBitmap::blit(const GBitmap *bm, int x, int y)
+{
+  // Check boundaries
+  if ((x >= ncolumns)              || 
+      (y >= nrows)                 ||
+      (x + (int)bm->columns() < 0) || 
+      (y + (int)bm->rows() < 0)     )
+    return;
+
+  // Perform blit
+  GMonitorLock lock1(monitor());
+  GMonitorLock lock2(bm->monitor());
+  if (bm->bytes)
+    {
+      if (!bytes_data)
+        uncompress();
+      // Blit from bitmap
+      const unsigned char *srow = bm->bytes + bm->border;
+      unsigned char *drow = bytes_data + border + y*bytes_per_row + x;
+      for (int sr = 0; sr < bm->nrows; sr++)
+        {
+          if (sr+y>=0 && sr+y<nrows) 
+            {
+              int sc = max(0, -x);
+              int sc1 = min(bm->ncolumns, ncolumns-x);
+              while (sc < sc1)
+                {
+                  drow[sc] += srow[sc];
+                  sc += 1;
+                }
+            }
+          srow += bm->bytes_per_row;
+          drow += bytes_per_row;
+        }
+    }
+  else if (bm->rle)
+    {
+      if (!bytes_data)
+        uncompress();
+      // Blit from rle
+      const unsigned char *runs = bm->rle;
+      unsigned char *drow = bytes_data + border + y*bytes_per_row + x;
+      int sr = bm->nrows - 1;
+      drow += sr * bytes_per_row;
+      int sc = 0;
+      char p = 0;
+      while (sr >= 0)
+        {
+          const int z = read_run(runs);
+          if (sc+z > bm->ncolumns)
+            G_THROW( ERR_MSG("GBitmap.lost_sync") );
+          int nc = sc + z;
+          if (p && sr+y>=0 && sr+y<nrows) 
+            {
+              if (sc + x < 0) 
+                sc = min(-x, nc); 
+              while (sc < nc && sc + x<ncolumns)
+                drow[sc++] += 1;
+            }
+          sc = nc;
+          p = 1 - p;
+          if (sc >= bm->ncolumns) 
+            {
+              p = 0;
+              sc = 0;
+              drow -= bytes_per_row;
+              sr -= 1; 
+            }
+        }
+    }
+}
+
+
+
+void 
+GBitmap::blit(const GBitmap *bm, int xh, int yh, int subsample)
+{
+  // Use code when no subsampling is necessary
+  if (subsample == 1)
+    {
+      blit(bm, xh, yh);
+      return;
+    }
+
+  // Check boundaries
+  if ((xh >= ncolumns * subsample) || 
+      (yh >= nrows * subsample)    ||
+      (xh + (int)bm->columns() < 0)   || 
+      (yh + (int)bm->rows() < 0)     )
+    return;
+
+  // Perform subsampling blit
+  GMonitorLock lock1(monitor());
+  GMonitorLock lock2(bm->monitor());
+  if (bm->bytes)
+    {
+      if (!bytes_data)
+        uncompress();
+      // Blit from bitmap
+      int dr, dr1, zdc, zdc1;
+      euclidian_ratio(yh, subsample, dr, dr1);
+      euclidian_ratio(xh, subsample, zdc, zdc1);
+      const unsigned char *srow = bm->bytes + bm->border;
+      unsigned char *drow = bytes_data + border + dr*bytes_per_row;
+      for (int sr = 0; sr < bm->nrows; sr++)
+        {
+          if (dr>=0 && dr<nrows) 
+            {
+              int dc = zdc;
+              int dc1 = zdc1;
+              for (int sc=0; sc < bm->ncolumns; sc++) 
+                {
+                  if (dc>=0 && dc<ncolumns)
+                    drow[dc] += srow[sc];
+                  if (++dc1 >= subsample) 
+                    {
+                      dc1 = 0;
+                      dc += 1;
+                    }
+                }
+            }
+          // next line in source
+          srow += bm->bytes_per_row;
+          // next line fraction in destination
+          if (++dr1 >= subsample)
+            {
+              dr1 = 0;
+              dr += 1;
+              drow += bytes_per_row;
+            }
+        }
+    }
+  else if (bm->rle)
+    {
+      if (!bytes_data)
+        uncompress();
+      // Blit from rle
+      int dr, dr1, zdc, zdc1;
+      euclidian_ratio(yh+bm->nrows-1, subsample, dr, dr1);
+      euclidian_ratio(xh, subsample, zdc, zdc1);
+      const unsigned char *runs = bm->rle;
+      unsigned char *drow = bytes_data + border + dr*bytes_per_row;
+      int sr = bm->nrows -1;
+      int sc = 0;
+      char p = 0;
+      int dc = zdc;
+      int dc1 = zdc1;
+      while (sr >= 0)
+        {
+          int z = read_run(runs);
+          if (sc+z > bm->ncolumns)
+            G_THROW( ERR_MSG("GBitmap.lost_sync") );
+          int nc = sc + z;
+
+          if (dr>=0 && dr<nrows)
+            while (z>0 && dc<ncolumns)
+              {
+                int zd = subsample - dc1;
+                if (zd > z) 
+                  zd = z;
+                if (p && dc>=0) 
+                  drow[dc] += zd;
+                z -= zd;
+                dc1 += zd;
+                if (dc1 >= subsample)
+                  {
+                    dc1 = 0;
+                    dc += 1;
+                  }
+              }
+          // next fractional row
+          sc = nc;
+          p = 1 - p;
+          if (sc >= bm->ncolumns) 
+            {
+              sc = 0;
+              dc = zdc;
+              dc1 = zdc1;
+              p = 0;
+              sr -= 1; 
+              if (--dr1 < 0)
+                {
+                  dr1 = subsample - 1;
+                  dr -= 1;
+                  drow -= bytes_per_row;
+                }
+            }
+        }
+    }
+}
+
+
+
+// ------ load bitmaps
+
+
+unsigned int 
+GBitmap::read_integer(char &c, ByteStream &bs)
+{
+  unsigned int x = 0;
+  // eat blank before integer
+  while (c==' ' || c=='\t' || c=='\r' || c=='\n' || c=='#') 
+    {
+      if (c=='#') 
+        do { } while (bs.read(&c,1) && c!='\n' && c!='\r');
+      c = 0; 
+      bs.read(&c, 1);
+    }
+  // check integer
+  if (c<'0' || c>'9')
+    G_THROW( ERR_MSG("GBitmap.not_int") );
+  // eat integer
+  while (c>='0' && c<='9') 
+    {
+      x = x*10 + c - '0';
+      c = 0;
+      bs.read(&c, 1);
+    }
+  return x;
+}
+
+
+void 
+GBitmap::read_pbm_text(ByteStream &bs)
+{
+  unsigned char *row = bytes_data + border;
+  row += (nrows-1) * bytes_per_row;
+  for (int n = nrows-1; n>=0; n--) 
+    {
+      for (int c = 0; c<ncolumns; c++) 
+        {
+          char bit = 0;
+          bs.read(&bit,1);
+          while (bit==' ' || bit=='\t' || bit=='\r' || bit=='\n')
+            { 
+              bit=0; 
+              bs.read(&bit,1); 
+            }
+          if (bit=='1')
+            row[c] = 1;
+          else if (bit=='0')
+            row[c] = 0;
+          else
+            G_THROW( ERR_MSG("GBitmap.bad_PBM") );
+        }
+      row -= bytes_per_row;
+    }
+}
+
+void 
+GBitmap::read_pgm_text(ByteStream &bs)
+{
+  unsigned char *row = bytes_data + border;
+  row += (nrows-1) * bytes_per_row;
+  char lookahead = '\n';
+  for (int n = nrows-1; n>=0; n--) 
+    {
+      for (int c = 0; c<ncolumns; c++)
+        row[c] = grays - 1 - read_integer(lookahead, bs);
+      row -= bytes_per_row;
+    }
+}
+
+void 
+GBitmap::read_pbm_raw(ByteStream &bs)
+{
+  unsigned char *row = bytes_data + border;
+  row += (nrows-1) * bytes_per_row;
+  for (int n = nrows-1; n>=0; n--) 
+    {
+      unsigned char acc = 0;
+      unsigned char mask = 0;
+      for (int c = 0; c<ncolumns; c++)
+        {
+          if (!mask) 
+            {
+              bs.read(&acc, 1);
+              mask = (unsigned char)0x80;
+            }
+          if (acc & mask)
+            row[c] = 1;
+          else
+            row[c] = 0;
+          mask >>= 1;
+        }
+      row -= bytes_per_row;
+    }
+}
+
+void 
+GBitmap::read_pgm_raw(ByteStream &bs)
+{
+  unsigned char *row = bytes_data + border;
+  row += (nrows-1) * bytes_per_row;
+  for (int n = nrows-1; n>=0; n--) 
+    {
+      for (int c = 0; c<ncolumns; c++)
+        {
+          unsigned char x;
+          bs.read((void*)&x, 1);
+          row[c] = grays - 1 - x;
+        }
+      row -= bytes_per_row;
+    }
+}
+
+void 
+GBitmap::read_rle_raw(ByteStream &bs)
+{
+  // interpret runs data
+  unsigned char h;
+  unsigned char p = 0;
+  unsigned char *row = bytes_data + border;
+  int n = nrows - 1;
+  row += n * bytes_per_row;
+  int c = 0;
+  while (n >= 0)
+    {
+      bs.read(&h, 1);
+      int x = h;
+      if (x >= (int)RUNOVERFLOWVALUE)
+        {
+          bs.read(&h, 1);
+          x = h + ((x - (int)RUNOVERFLOWVALUE) << 8);
+        }
+      if (c+x > ncolumns)
+        G_THROW( ERR_MSG("GBitmap.lost_sync") );
+      while (x-- > 0)
+        row[c++] = p;
+      p = 1 - p;
+      if (c >= ncolumns) 
+        {
+          c = 0;
+          p = 0;
+          row -= bytes_per_row;
+          n -= 1; 
+        }
+    }
+}
+
+
+// ------ save bitmaps
+
+void 
+GBitmap::save_pbm(ByteStream &bs, int raw)
+{
+  // check arguments
+  if (grays > 2)
+    G_THROW( ERR_MSG("GBitmap.cant_make_PBM") );
+  GMonitorLock lock(monitor());
+  // header
+  {
+    GUTF8String head;
+    head.format("P%c\n%d %d\n", (raw ? '4' : '1'), ncolumns, nrows);
+    bs.writall((void*)(const char *)head, head.length());
+  }
+  // body
+  if(raw)
+  {
+    if(!rle)
+      compress();
+    const unsigned char *runs=rle;
+    const unsigned char * const runs_end=rle+rlelength;
+    const int count=(ncolumns+7)>>3;
+    unsigned char *buf;
+    GPBuffer<unsigned char> gbuf(buf,count);
+    while(runs<runs_end)
+    {
+      rle_get_bitmap(ncolumns,runs,buf,false);
+      bs.writall(buf,count);
+    }
+  }else
+  {
+    if (!bytes)
+      uncompress();
+    const unsigned char *row = bytes + border;
+    int n = nrows - 1;
+    row += n * bytes_per_row;
+    while (n >= 0)
+    {
+      unsigned char eol='\n';
+      for (int c=0; c<ncolumns;)
+      {
+        unsigned char bit= (row[c] ? '1' : '0');
+        bs.write((void*)&bit, 1);
+        c += 1;
+        if (c==ncolumns || (c&(int)RUNMSBMASK)==0) 
+          bs.write((void*)&eol, 1);          
+       }
+      // next row
+      row -= bytes_per_row;
+      n -= 1;
+    }
+  }
+}
+
+void 
+GBitmap::save_pgm(ByteStream &bs, int raw)
+{
+  // checks
+  GMonitorLock lock(monitor());
+  if (!bytes)
+    uncompress();
+  // header
+  GUTF8String head;
+  head.format("P%c\n%d %d\n%d\n", (raw ? '5' : '2'), ncolumns, nrows, grays-1);
+  bs.writall((void*)(const char *)head, head.length());
+  // body
+  const unsigned char *row = bytes + border;
+  int n = nrows - 1;
+  row += n * bytes_per_row;
+  while (n >= 0)
+    {
+      if (raw)
+        {
+          for (int c=0; c<ncolumns; c++)
+            {
+              char x = grays - 1 - row[c];
+              bs.write((void*)&x, 1);
+            }
+        }
+      else 
+        {
+          unsigned char eol='\n';
+          for (int c=0; c<ncolumns; )
+            {
+              head.format("%d ", grays - 1 - row[c]);
+              bs.writall((void*)(const char *)head, head.length());
+              c += 1;
+              if (c==ncolumns || (c&0x1f)==0) 
+                bs.write((void*)&eol, 1);          
+            }
+        }
+      row -= bytes_per_row;
+      n -= 1;
+    }
+}
+
+void 
+GBitmap::save_rle(ByteStream &bs)
+{
+  // checks
+  if (ncolumns==0 || nrows==0)
+    G_THROW( ERR_MSG("GBitmap.not_init") );
+  GMonitorLock lock(monitor());
+  if (grays > 2)
+    G_THROW( ERR_MSG("GBitmap.cant_make_PBM") );
+  // header
+  GUTF8String head;
+  head.format("R4\n%d %d\n", ncolumns, nrows);
+  bs.writall((void*)(const char *)head, head.length());
+  // body
+  if (rle)
+    {
+      bs.writall((void*)rle, rlelength);
+    }
+  else
+    {
+      unsigned char *runs = 0;
+      GPBuffer<unsigned char> gruns(runs);
+      int size = encode(runs,gruns);
+      bs.writall((void*)runs, size);
+    }
+}
+
+
+// ------ runs
+
+
+void
+GBitmap::makerows(
+  int nrows, const int ncolumns, unsigned char *runs, unsigned char *rlerows[])
+{
+  while (nrows-- > 0)
+  {
+    rlerows[nrows] = runs;
+    int c;
+    for(c=0;c<ncolumns;c+=GBitmap::read_run(runs))
+      EMPTY_LOOP;
+    if (c > ncolumns)
+      G_THROW( ERR_MSG("GBitmap.lost_sync2") );
+  }
+}
+
+
+void
+GBitmap::rle_get_bitmap (
+  const int ncolumns,
+  const unsigned char *&runs,
+  unsigned char *bitmap,
+  const bool invert )
+{
+  const int obyte_def=invert?0xff:0;
+  const int obyte_ndef=invert?0:0xff;
+  int mask=0x80,obyte=0;
+  for(int c=ncolumns;c > 0 ;)
+  {
+    int x=read_run(runs);
+    c-=x;
+    while((x--)>0)
+    {
+      if(!(mask>>=1))
+      {
+        *(bitmap++) = obyte^obyte_def;
+        obyte=0;
+        mask=0x80;
+        for(;x>=8;x-=8)
+        {
+          *(bitmap++)=obyte_def;
+        }
+      }
+    }
+    if(c>0)
+    {
+      int x=read_run(runs);
+      c-=x;
+      while((x--)>0)
+      {
+        obyte|=mask;
+        if(!(mask>>=1))
+        {
+          *(bitmap++)=obyte^obyte_def;
+          obyte=0;
+          mask=0x80;
+          for(;(x>8);x-=8)
+            *(bitmap++)=obyte_ndef;
+        }
+      }
+    }
+  }
+  if(mask != 0x80)
+  {
+    *(bitmap++)=obyte^obyte_def;
+  }
+}
+
+int 
+GBitmap::rle_get_bits(int rowno, unsigned char *bits) const
+{
+  GMonitorLock lock(monitor());
+  if (!rle)
+    return 0;
+  if (rowno<0 || rowno>=nrows)
+    return 0;
+  if (!rlerows)
+  {
+    const_cast<GPBuffer<unsigned char *> &>(grlerows).resize(nrows);
+    makerows(nrows,ncolumns,rle,const_cast<unsigned char **>(rlerows));
+  }
+  int n = 0;
+  int p = 0;
+  int c = 0;
+  unsigned char *runs = rlerows[rowno];
+  while (c < ncolumns)
+    {
+      const int x=read_run(runs);
+      if ((c+=x)>ncolumns)
+        c = ncolumns;
+      while (n<c)
+        bits[n++] = p;
+      p = 1-p;
+    }
+  return n;
+}
+
+
+int 
+GBitmap::rle_get_runs(int rowno, int *rlens) const
+{
+  GMonitorLock lock(monitor());
+  if (!rle)
+    return 0;
+  if (rowno<0 || rowno>=nrows)
+    return 0;
+  if (!rlerows)
+  {
+    const_cast<GPBuffer<unsigned char *> &>(grlerows).resize(nrows);
+    makerows(nrows,ncolumns,rle,const_cast<unsigned char **>(rlerows));
+  }
+  int n = 0;
+  int d = 0;
+  int c = 0;
+  unsigned char *runs = rlerows[rowno];
+  while (c < ncolumns)
+    {
+      const int x=read_run(runs);
+      if (n>0 && !x)
+        {
+          n--;
+          d = d-rlens[n];
+        }
+      else 
+        {
+          rlens[n++] = (c+=x)-d;
+          d = c;
+        }
+    }
+  return n;
+}
+
+
+int 
+GBitmap::rle_get_rect(GRect &rect) const
+{
+  GMonitorLock lock(monitor());
+  if (!rle) 
+    return 0;
+  int area = 0;
+  unsigned char *runs = rle;
+  rect.xmin = ncolumns;
+  rect.ymin = nrows;
+  rect.xmax = 0;
+  rect.ymax = 0;
+  int r = nrows;
+  while (--r >= 0)
+    {
+      int p = 0;
+      int c = 0;
+      int n = 0;
+      while (c < ncolumns)
+        {
+          const int x=read_run(runs);
+          if(x)
+            {
+              if (p)
+                {
+                  if (c < rect.xmin) 
+                    rect.xmin = c;
+                  if ((c += x) > rect.xmax) 
+                    rect.xmax = c-1;
+                  n += x;
+                }
+              else
+                {
+                  c += x;
+                }
+            }
+          p = 1-p;
+        }
+      area += n;
+      if (n)
+        {
+          rect.ymin = r;
+          if (r > rect.ymax) 
+            rect.ymax = r;
+        }
+    }
+  if (area==0)
+    rect.clear();
+  return area;
+}
+
+
+
+// ------ helpers
+
+int
+GBitmap::encode(unsigned char *&pruns,GPBuffer<unsigned char> &gpruns) const
+{
+  // uncompress rle information
+  if (nrows==0 || ncolumns==0)
+  {
+    gpruns.resize(0);
+    return 0;
+  }
+  if (!bytes)
+    {
+      unsigned char *runs;
+      GPBuffer<unsigned char> gruns(runs,rlelength);
+      memcpy((void*)runs, rle, rlelength);
+      gruns.swap(gpruns);
+      return rlelength;
+    }
+  gpruns.resize(0);
+  // create run array
+  int pos = 0;
+  int maxpos = 1024 + ncolumns + ncolumns;
+  unsigned char *runs;
+  GPBuffer<unsigned char> gruns(runs,maxpos);
+  // encode bitmap as rle
+  const unsigned char *row = bytes + border;
+  int n = nrows - 1;
+  row += n * bytes_per_row;
+  while (n >= 0)
+    {
+      if (maxpos < pos+ncolumns+ncolumns+2)
+        {
+          maxpos += 1024 + ncolumns + ncolumns;
+          gruns.resize(maxpos);
+        }
+
+      unsigned char *runs_pos=runs+pos;
+      const unsigned char * const runs_pos_start=runs_pos;
+      append_line(runs_pos,row,ncolumns);
+      pos+=(size_t)runs_pos-(size_t)runs_pos_start;
+      row -= bytes_per_row;
+      n -= 1;
+    }
+  // return result
+  gruns.resize(pos);
+  gpruns.swap(gruns);
+  return pos;
+}
+
+void 
+GBitmap::decode(unsigned char *runs)
+{
+  // initialize pixel array
+  if (nrows==0 || ncolumns==0)
+    G_THROW( ERR_MSG("GBitmap.not_init") );
+  bytes_per_row = ncolumns + border;
+  if (runs==0)
+    G_THROW( ERR_MSG("GBitmap.null_arg") );
+  int npixels = nrows * bytes_per_row + border;
+  if (!bytes_data)
+  {
+    gbytes_data.resize(npixels);
+    bytes = bytes_data;
+  }
+  gbytes_data.clear();
+  gzerobuffer=zeroes(bytes_per_row + border);
+  // interpret runs data
+  int c, n;
+  unsigned char p = 0;
+  unsigned char *row = bytes_data + border;
+  n = nrows - 1;
+  row += n * bytes_per_row;
+  c = 0;
+  while (n >= 0)
+    {
+      int x = read_run(runs);
+      if (c+x > ncolumns)
+        G_THROW( ERR_MSG("GBitmap.lost_sync2") );
+      while (x-- > 0)
+        row[c++] = p;
+      p = 1 - p;
+      if (c >= ncolumns) 
+        {
+          c = 0;
+          p = 0;
+          row -= bytes_per_row;
+          n -= 1; 
+        }
+    }
+  // Free rle data possibly attached to this bitmap
+  grle.resize(0);
+  grlerows.resize(0);
+  rlelength = 0;
+#ifndef NDEBUG
+  check_border();
+#endif
+}
+
+class GBitmap::ZeroBuffer : public GPEnabled
+{
+public:
+  ZeroBuffer(const unsigned int zerosize);
+  unsigned char *zerobuffer;
+  GPBuffer<unsigned char> gzerobuffer;
+};
+
+GBitmap::ZeroBuffer::ZeroBuffer(const unsigned int zerosize)
+: gzerobuffer(zerobuffer,zerosize)
+{
+  gzerobuffer.clear();
+  GBitmap::zerobuffer=zerobuffer;
+  GBitmap::zerosize=zerosize;
+}
+
+static const unsigned char static_zerobuffer[]=
+{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 32
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 64
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 96 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 128 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 160
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 192
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 234
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 256
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 288
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 320
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 352 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 384 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 416
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 448
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 480
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 512
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 544
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 576
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 608 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 640 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 672
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 704
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 736
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 768
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 800
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 832
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 864 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 896 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 928
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 960
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 992
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+32
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+64
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+96 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+128 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+160
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+192
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+234
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+256
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+288
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+320
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+352 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+384 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+416
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+448
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+480
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+512
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+544
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+576
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+608 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+640 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+672
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+704
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+736
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+768
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+800
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+832
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+864 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+896 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+928
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+960
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 1024+992
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+32
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+64
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+96 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+128 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+160
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+192
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+234
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+256
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+288
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+320
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+352 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+384 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+416
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+448
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+480
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+512
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+544
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+576
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+608 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+640 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+672
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+704
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+736
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+768
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+800
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+832
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+864 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+896 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+928
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+960
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 2048+992
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+32
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+64
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+96 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+128 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+160
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+192
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+234
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+256
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+288
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+320
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+352 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+384 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+416
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+448
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+480
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+512
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+544
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+576
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+608 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+640 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+672
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+704
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+736
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+768
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+800
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+832
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+864 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+896 
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+928
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+960
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 3072+992
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; // 4096
+
+int GBitmap::zerosize = sizeof(static_zerobuffer);
+unsigned char *GBitmap::zerobuffer=const_cast<unsigned char *>(static_zerobuffer);
+
+GP<GBitmap::ZeroBuffer>
+GBitmap::zeroes(int required)
+{
+  GMonitorLock lock(&monitors[0]); // any monitor would do
+  static GP<GBitmap::ZeroBuffer> gzerobuffer;
+  if (zerosize < required)
+  {
+    int z;
+    for(z=zerosize;z<required;z <<= 1)
+      EMPTY_LOOP;
+    z=(z+0xfff)&(~0xfff);
+    gzerobuffer=new GBitmap::ZeroBuffer((unsigned int)z);
+  }
+  return gzerobuffer;
+}
+
+
+// Fills a bitmap with the given value
+void 
+GBitmap::fill(unsigned char value)
+{
+  GMonitorLock lock(monitor());
+  for(unsigned int y=0; y<rows(); y++)
+    {
+      unsigned char* bm_y = (*this)[y];
+      for(unsigned int x=0; x<columns(); x++)
+        bm_y[x] = value;
+    }
+}
+
+
+void 
+GBitmap::append_long_run(unsigned char *&data, int count)
+{
+  while (count > MAXRUNSIZE)
+    {
+      data[0] = data[1] = 0xff;
+      data[2] = 0;
+      data += 3;
+      count -= MAXRUNSIZE;
+    }
+  if (count < RUNOVERFLOWVALUE)
+    {
+      data[0] = count;
+      data += 1;
+    }
+  else
+    {
+      data[0] = (count>>8) + GBitmap::RUNOVERFLOWVALUE;
+      data[1] = (count & 0xff);
+      data += 2;
+    }
+}
+
+
+void
+GBitmap::append_line(unsigned char *&data,const unsigned char *row,
+                     const int rowlen,bool invert)
+{
+  const unsigned char *rowend=row+rowlen;
+  bool p=!invert;
+  while(row<rowend)
+    {
+      int count=0;
+      if ((p=!p)) 
+        {
+          if(*row)
+            for(++count,++row;(row<rowend)&&*row;++count,++row)
+            	EMPTY_LOOP;
+        } 
+      else if(!*row)
+        {
+          for(++count,++row;(row<rowend)&&!*row;++count,++row)
+          	EMPTY_LOOP;
+        }
+      append_run(data,count);
+    }
+}
+
+#if 0
+static inline int
+GetRowTDLRNR(
+  GBitmap &bit,const int row, const unsigned char *&startptr,
+  const unsigned char *&stopptr)
+{
+  stopptr=(startptr=bit[row])+bit.columns();
+  return 1;
+}
+
+static inline int
+GetRowTDLRNR(
+  GBitmap &bit,const int row, const unsigned char *&startptr,
+  const unsigned char *&stopptr)
+{
+  stopptr=(startptr=bit[row])+bit.columns();
+  return 1;
+}
+
+static inline int
+GetRowTDRLNR(
+  GBitmap &bit,const int row, const unsigned char *&startptr,
+  const unsigned char *&stopptr)
+{
+  startptr=(stopptr=bit[row]-1)+bit.columns();
+  return -1;
+}
+#endif // 0
+
+GP<GBitmap> 
+GBitmap::rotate(int count)
+{
+  GP<GBitmap> newbitmap=this;
+  if((count%=4))
+  {
+    if( count & 0x01 )
+    {
+      newbitmap = new GBitmap(ncolumns, nrows);
+    }else
+    {
+      newbitmap = new GBitmap(nrows, ncolumns);
+    }
+    GMonitorLock lock(monitor());
+    if (!bytes_data)
+      uncompress();
+    GBitmap &dbitmap = *newbitmap;
+    dbitmap.set_grays(grays);
+    switch(count)
+    {
+    case 1: // rotate 90 counter clockwise
+      {
+        const int lastrow = dbitmap.rows()-1;
+        for(int y=0; y<nrows; y++)
+        {
+          const unsigned char *r=operator[] (y);
+          for(int x=0,xnew=lastrow;xnew>=0; x++,xnew--)
+          {
+            dbitmap[xnew][y] = r[x];
+          }
+        }
+      }
+      break;
+    case 2: // rotate 180 counter clockwise
+      {
+        const int lastrow = dbitmap.rows()-1;
+        const int lastcolumn = dbitmap.columns()-1;
+        for(int y=0,ynew=lastrow;ynew>=0; y++,ynew--)
+        {
+          const unsigned char *r=operator[] (y);
+          unsigned char *d=dbitmap[ynew];
+          for(int xnew=lastcolumn;xnew>=0; r++,--xnew)
+          {
+            d[xnew] = *r;
+          }
+        }
+      }
+      break;
+    case 3: // rotate 270 counter clockwise
+      {
+        const int lastcolumn = dbitmap.columns()-1;
+        for(int y=0,ynew=lastcolumn;ynew>=0;y++,ynew--)
+        {
+          const unsigned char *r=operator[] (y);
+          for(int x=0; x<ncolumns; x++)
+          {
+            dbitmap[x][ynew] = r[x];
+          }
+        }
+      }
+      break;
+    }
+    if(grays == 2)
+    {
+      compress();
+      dbitmap.compress();
+    }
+  }
+  return newbitmap;
+}
+
+#ifndef NDEBUG
+void 
+GBitmap::check_border() const
+{int col ;
+  if (bytes)
+    {
+      const unsigned char *p = (*this)[-1];
+      for (col=-border; col<ncolumns+border; col++)
+        if (p[col])
+          G_THROW( ERR_MSG("GBitmap.zero_damaged") );
+      for (int row=0; row<nrows; row++)
+        {
+          p = (*this)[row];
+          for (col=-border; col<0; col++)
+            if (p[col])
+              G_THROW( ERR_MSG("GBitmap.left_damaged") );
+          for (col=ncolumns; col<ncolumns+border; col++)
+            if (p[col])
+              G_THROW( ERR_MSG("GBitmap.right_damaged") );
+        }
+    }
+}
+#endif
+
+
+#ifdef HAVE_NAMESPACES
+}
+# ifndef NOT_USING_DJVU_NAMESPACE
+using namespace DJVU;
+# endif
+#endif
+
-- 
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