libjava/gnu/gcj/xlib/natColormap.cc

   1 /* Copyright (C) 2000  Free Software Foundation
   2
   3    This file is part of libgcj.
   4
   5 This software is copyrighted work licensed under the terms of the
   6 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   7 details.  */
   8
   9 // Needed to avoid linking in libstdc++
  10 #ifndef __STL_USE_EXCEPTIONS
  11 #   include <java/lang/OutOfMemoryError.h>
  12 #   define __THROW_BAD_ALLOC throw new java::lang::OutOfMemoryError()
  13 #endif
  14
  15 #include <vector>
  16
  17 #include <X11/Xlib.h>
  18
  19 #include <gcj/cni.h>
  20 #include <java/lang/RuntimeException.h>
  21 #include <gnu/gcj/xlib/Display.h>
  22 #include <gnu/gcj/xlib/Screen.h>
  23 #include <gnu/gcj/xlib/Colormap.h>
  24 #include <gnu/gcj/xlib/XColor.h>
  25 #include <gnu/gcj/RawData.h>
  26
  27 jlong gnu::gcj::xlib::Colormap::allocateColorPixel(XColor* color)
  28 {
  29   ::Display* dpy = (::Display*) (screen->getDisplay()->display);
  30   ::XColor* col = (::XColor*) (color->structure);
  31   Status result = XAllocColor(dpy, xid, col);
  32   if (result == 0)
  33     throw new java::lang::RuntimeException(
  34       JvNewStringLatin1("Unable to allocate color pixel."));
  35
  36   return col->pixel;
  37 }
  38
  39 typedef JArray<gnu::gcj::xlib::XColor*>* xcolorarray;
  40
  41 xcolorarray gnu::gcj::xlib::Colormap::getSharedColors()
  42 {
  43   ::Display* dpy = (::Display*) (screen->getDisplay()->display);
  44   unsigned int nCells = CellsOfScreen(ScreenOfDisplay(dpy, screen->screenNumber));
  45
  46   typedef ::XColor xcolor;
  47   std::vector<xcolor> colors(nCells);
  48   for (unsigned int i=0; i<nCells; i++)
  49     colors[i].pixel = i;
  50   ::XColor* cols = colors.get_allocator().address(colors.front());
  51   XQueryColors(dpy, xid, cols,
  52                nCells);
  53
  54   int nShared = 0;
  55   for (unsigned int i=0; i<nCells; i++)
  56     {
  57       ::XColor color = colors[i];
  58
  59       if (!XAllocColor(dpy, xid, &color))
  60         continue;
  61
  62       /* FIXME: In some cases this algorithm may identify a free
  63          color cell as a shared one. */
  64       if (color.pixel != i)
  65         {
  66           // Oops, the color wasn't shared. Free it.
  67           XFreeColors(dpy, xid, &(color.pixel), 1, 0);
  68           colors[i].flags = FLAG_NOT_SHARED;
  69           continue;
  70         }
  71
  72       // FIXME: Shared or free?
  73
  74       nShared++;
  75       colors[i].flags = FLAG_SHARED;
  76     }
  77
  78   JArray<XColor*>* shared = newXColorArray(nShared);
  79   int si=0;
  80   for (unsigned int i=0; i<nCells; i++)
  81     {
  82       if (colors[i].flags != FLAG_SHARED)
  83         continue;
  84
  85       XColor* col = elements(shared)[si++];
  86       gnu::gcj::RawData* colorData = col->structure;
  87       ::XColor* colStruct = reinterpret_cast<xcolor*>(colorData);
  88       *colStruct = colors[i];
  89     }
  90
  91   return shared;
  92 }
  93
  94 xcolorarray gnu::gcj::xlib::Colormap::getXColors()
  95 {
  96   ::Display* dpy = (::Display*) (screen->getDisplay()->display);
  97   unsigned int nCells =
  98     CellsOfScreen(ScreenOfDisplay(dpy, screen->screenNumber));
  99
 100   typedef ::XColor xcolor;
 101   std::vector<xcolor> colors(nCells);
 102
 103   JArray<XColor*>* colArray = newXColorArray(nCells);
 104
 105   for (unsigned int i=0; i<nCells; i++)
 106     colors[i].pixel = i;
 107
 108   XQueryColors(dpy, xid, &(colors.front()), nCells);
 109
 110   /* TODO: The current problem with this code is that it relies on
 111      (color.pixel == i) as an indicator that the color is
 112      shared. However, (color.pixel == i), may also occur simply
 113      because color cell i simply was the next free in the list of
 114      unallocated color cells.  IDEA: run through the list both
 115      backwards and forwards, and only pick out the colorcells that
 116      have been identified as shared during both passes.  Reversing the
 117      traversal direction might prevent i from corresponding to the
 118      next free colorcell, atleast in one of the passes. */
 119   for (unsigned int i=0; i<nCells; i++)
 120     {
 121       ::XColor color = colors[i];
 122
 123       char flag = FLAG_NOT_SHARED;
 124       if (XAllocColor(dpy, xid, &color))
 125         {
 126           if (color.pixel == i)
 127             {
 128               flag = FLAG_SHARED;
 129             }
 130           else
 131             {
 132               // Oops, the color wasn't shared. Free it.
 133               XFreeColors(dpy, xid, &(color.pixel), 1, 0);
 134             }
 135         }
 136
 137       // Copy color data into object in array
 138       XColor* col = elements(colArray)[i];
 139       gnu::gcj::RawData* colorData = col->structure;
 140       ::XColor* colStruct = reinterpret_cast<xcolor*>(colorData);
 141       *colStruct = colors[i];
 142       colStruct->flags = flag;
 143     }
 144
 145   return colArray;
 146 }
 147