Include a stripped-down version of FLTK in tree and add a USE_INCLUDED_FLTK option to build against it.


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4603 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/fltk/src/Fl_visual.cxx b/common/fltk/src/Fl_visual.cxx
new file mode 100644
index 0000000..98c3c3a
--- /dev/null
+++ b/common/fltk/src/Fl_visual.cxx
@@ -0,0 +1,155 @@
+//
+// "$Id: Fl_visual.cxx 7903 2010-11-28 21:06:39Z matt $"
+//
+// Visual support for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2010 by Bill Spitzak and others.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library 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
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+
+// Set the default visual according to passed switches:
+
+#include <config.h>
+#include <FL/Fl.H>
+#include <FL/x.H>
+
+/** \fn  Fl::visual(int flags)
+    Selects a visual so that your graphics are drawn correctly.  This is
+    only allowed before you call show() on any windows.  This does nothing
+    if the default visual satisfies the capabilities, or if no visual
+    satisfies the capabilities, or on systems that don't have such
+    brain-dead notions.
+    
+    <P>Only the following combinations do anything useful:
+    
+    <UL>
+    <LI>Fl::visual(FL_RGB)
+    <BR>Full/true color (if there are several depths FLTK chooses  the
+    largest).  Do this if you use fl_draw_image
+    for much better (non-dithered)  output.
+    <BR>&nbsp; </LI>
+    <LI>Fl::visual(FL_RGB8)
+    <BR>Full color with at least 24 bits of color. FL_RGB will
+    always  pick this if available, but if not it will happily return a
+    less-than-24 bit deep visual.  This call fails if 24 bits are not
+    available.
+    <BR>&nbsp; </LI>
+    <LI>Fl::visual(FL_DOUBLE|FL_INDEX)
+    <BR>Hardware double buffering.  Call this if you are going to use 
+    Fl_Double_Window.
+    <BR>&nbsp; </LI>
+    <LI>Fl::visual(FL_DOUBLE|FL_RGB)</LI>
+    <LI>Fl::visual(FL_DOUBLE|FL_RGB8)
+    <BR>Hardware double buffering and full color.
+    </UL>
+    
+    <P>This returns true if the system has the capabilities by default or
+    FLTK suceeded in turing them on.  Your program will still work even if
+    this returns false (it just won't look as good).
+*/
+#ifdef WIN32
+int Fl::visual(int flags) {
+  fl_GetDC(0);
+  if (flags & FL_DOUBLE) return 0;
+  if (!(flags & FL_INDEX) &&
+    GetDeviceCaps(fl_gc,BITSPIXEL) <= 8) return 0;
+  if ((flags & FL_RGB8) && GetDeviceCaps(fl_gc,BITSPIXEL)<24) return 0;
+  return 1;
+}
+#elif defined(__APPLE__)
+
+// \todo Mac : need to implement Visual flags
+int Fl::visual(int flags) {
+  (void)flags;
+  return 1;
+}
+
+#else
+
+#if USE_XDBE
+#include <X11/extensions/Xdbe.h>
+#endif
+
+static int test_visual(XVisualInfo& v, int flags) {
+  if (v.screen != fl_screen) return 0;
+#if USE_COLORMAP
+  if (!(flags & FL_INDEX)) {
+    if (v.c_class != StaticColor && v.c_class != TrueColor) return 0;
+    if (v.depth <= 8) return 0; // fltk will work better in colormap mode
+  }
+  if (flags & FL_RGB8) {
+    if (v.depth < 24) return 0;
+  }
+  // for now, fltk does not like colormaps of more than 8 bits:
+  if ((v.c_class&1) && v.depth > 8) return 0;
+#else
+  // simpler if we can't use colormapped visuals at all:
+  if (v.c_class != StaticColor && v.c_class != TrueColor) return 0;
+#endif
+#if USE_XDBE
+  if (flags & FL_DOUBLE) {
+    static XdbeScreenVisualInfo *xdbejunk;
+    if (!xdbejunk) {
+      int event_base, error_base;
+      if (!XdbeQueryExtension(fl_display, &event_base, &error_base)) return 0;
+      Drawable root = RootWindow(fl_display,fl_screen);
+      int numscreens = 1;
+      xdbejunk = XdbeGetVisualInfo(fl_display,&root,&numscreens);
+      if (!xdbejunk) return 0;
+    }
+    for (int j = 0; ; j++) {
+      if (j >= xdbejunk->count) return 0;
+      if (xdbejunk->visinfo[j].visual == v.visualid) break;
+    }
+  }
+#endif
+  return 1;
+}
+
+int Fl::visual(int flags) {
+#if USE_XDBE == 0
+  if (flags & FL_DOUBLE) return 0;
+#endif
+  fl_open_display();
+  // always use default if possible:
+  if (test_visual(*fl_visual, flags)) return 1;
+  // get all the visuals:
+  XVisualInfo vTemplate;
+  int num;
+  XVisualInfo *visualList = XGetVisualInfo(fl_display, 0, &vTemplate, &num);
+  // find all matches, use the one with greatest depth:
+  XVisualInfo *found = 0;
+  for (int i=0; i<num; i++) if (test_visual(visualList[i], flags)) {
+    if (!found || found->depth < visualList[i].depth)
+      found = &visualList[i];
+  }
+  if (!found) {XFree((void*)visualList); return 0;}
+  fl_visual = found;
+  fl_colormap = XCreateColormap(fl_display, RootWindow(fl_display,fl_screen),
+				fl_visual->visual, AllocNone);
+  return 1;
+}
+
+#endif
+
+//
+// End of "$Id: Fl_visual.cxx 7903 2010-11-28 21:06:39Z matt $".
+//