src/ColorHandler.C

   1 /* This file is part of
   2  * ======================================================
   3  *
   4  *           LyX, The Document Processor
   5  *
   6  *          Copyright 1998-2001 The LyX Team
   7  *
   8  *======================================================*/
   9
  10 #include <config.h>
  11
  12 #ifdef __GNUG__
  13 #pragma implementation
  14 #endif
  15
  16 #include "ColorHandler.h"
  17 #include "LColor.h"
  18 #include "gettext.h"
  19 #include "debug.h"
  20
  21 #include "frontends/GUIRunTime.h"
  22
  23 #include <cmath>
  24
  25 using std::endl;
  26
  27
  28 LyXColorHandler::LyXColorHandler()
  29 {
  30         display = GUIRunTime::x11Display();
  31         drawable = XCreatePixmap(display,
  32                                  RootWindow(display, GUIRunTime::x11Screen()),
  33                                  10, 10,
  34                                  GUIRunTime::x11VisualDepth());
  35
  36         colormap = GUIRunTime::x11Colormap();
  37         // Clear the GC cache
  38         for (int i = 0; i <= LColor::ignore; ++i) {
  39                 colorGCcache[i] = 0;
  40         }
  41 }
  42
  43
  44 LyXColorHandler::~LyXColorHandler()
  45 {
  46         // Release all the registered GCs
  47         for (int i = 0; i <= LColor::ignore; ++i) {
  48                 if (colorGCcache[i] != 0) {
  49                         XFreeGC(display, colorGCcache[i]);
  50                 }
  51         }
  52         // Iterate over the line cache and Free the GCs
  53         for (LineGCCache::iterator lit = lineGCcache.begin();
  54              lit != lineGCcache.end(); ++lit) {
  55                 XFreeGC(display, lit->second);
  56         }
  57 }
  58
  59
  60 unsigned long LyXColorHandler::colorPixel(LColor::color c)
  61 {
  62         XGCValues val;
  63         XGetGCValues(display, getGCForeground(c), GCForeground, &val);
  64         return val.foreground;
  65 }
  66
  67
  68 // Gets GC according to color
  69 // Uses caching
  70 GC LyXColorHandler::getGCForeground(LColor::color c)
  71 {
  72         //if (lyxerr.debugging()) {
  73         //      lyxerr << "Painter drawable: " << drawable() << endl;
  74         //}
  75
  76         if (colorGCcache[c] != 0)
  77                 return colorGCcache[c];
  78
  79         XColor xcol;
  80         XColor ccol;
  81         string const s = lcolor.getX11Name(c);
  82         XGCValues val;
  83
  84         // Look up the RGB values for the color, and an approximate
  85         // color that we can hope to get on this display.
  86         if (XLookupColor(display, colormap, s.c_str(), &xcol, &ccol) == 0) {
  87                 lyxerr << _("LyX: Unknown X11 color ") << s
  88                        << _(" for ") << lcolor.getGUIName(c) << '\n'
  89                        << _("     Using black instead, sorry!") << endl;
  90                 unsigned long bla = BlackPixel(display,
  91                                                DefaultScreen(display));
  92                 val.foreground = bla;
  93         // Try the exact RGB values first, then the approximate.
  94         } else if (XAllocColor(display, colormap, &xcol) != 0) {
  95                 if (lyxerr.debugging(Debug::GUI)) {
  96                         lyxerr << _("LyX: X11 color ") << s
  97                                << _(" allocated for ")
  98                                << lcolor.getGUIName(c) << endl;
  99                 }
 100                 val.foreground = xcol.pixel;
 101         } else if (XAllocColor(display, colormap, &ccol)) {
 102                 lyxerr << _("LyX: Using approximated X11 color ") << s
 103                        << _(" allocated for ")
 104                        << lcolor.getGUIName(c) << endl;
 105                 val.foreground = xcol.pixel;
 106         } else {
 107                 // Here we are traversing the current colormap to find
 108                 // the color closest to the one we want.
 109                 Visual * vi = DefaultVisual(display, DefaultScreen(display));
 110
 111                 boost::scoped_array<XColor> cmap(new XColor[vi->map_entries]);
 112
 113                 for (int i = 0; i < vi->map_entries; ++i) {
 114                         cmap[i].pixel = i;
 115                 }
 116                 XQueryColors(display, colormap, cmap.get(), vi->map_entries);
 117
 118                 // Walk through the cmap and look for close colors.
 119                 int closest_pixel = 0;
 120                 double closest_distance = 1e20; // we want to minimize this
 121                 double distance = 0;
 122                 for (int t = 0; t < vi->map_entries; ++t) {
 123                         // The Euclidean distance between two points in
 124                         // a three-dimensional space, the RGB color-cube,
 125                         // is used as the distance measurement between two
 126                         // colors.
 127
 128                         // Since square-root is monotonous, we don't have to
 129                         // take the square-root to find the minimum, and thus
 130                         // we use the squared distance instead to be faster.
 131
 132                         // If we want to get fancy, we could convert the RGB
 133                         // coordinates to a different color-cube, maybe HSV,
 134                         // but the RGB cube seems to work great.  (Asger)
 135                         distance = pow(cmap[t].red   - xcol.red,   2.0) +
 136                                    pow(cmap[t].green - xcol.green, 2.0) +
 137                                    pow(cmap[t].blue  - xcol.blue,  2.0);
 138                         if (distance < closest_distance) {
 139                                 closest_distance = distance;
 140                                 closest_pixel = t;
 141                         }
 142                 }
 143                 lyxerr << _("LyX: Couldn't allocate '") << s
 144                        << _("' for ") << lcolor.getGUIName(c)
 145                        << _(" with (r,g,b)=(")
 146                        << xcol.red << "," << xcol.green << ","
 147                        << xcol.blue << ").\n"
 148                        << _("     Using closest allocated "
 149                             "color with (r,g,b)=(")
 150                        << cmap[closest_pixel].red << ","
 151                        << cmap[closest_pixel].green << ","
 152                        << cmap[closest_pixel].blue << _(") instead.\n")
 153                        << _("Pixel [") << closest_pixel << _("] is used.")
 154                        << endl;
 155                 val.foreground = cmap[closest_pixel].pixel;
 156         }
 157
 158         val.function = GXcopy;
 159         return colorGCcache[c] = XCreateGC(display, drawable,
 160                                     GCForeground | GCFunction, &val);
 161 }
 162
 163
 164 // Gets GC for line
 165 GC LyXColorHandler::getGCLinepars(PainterBase::line_style ls,
 166                                   PainterBase::line_width lw, LColor::color c)
 167 {
 168         //if (lyxerr.debugging()) {
 169         //      lyxerr << "Painter drawable: " << drawable() << endl;
 170         //}
 171
 172         int index = lw + (ls << 1) + (c << 6);
 173
 174         LineGCCache::iterator it = lineGCcache.find(index);
 175         if (it != lineGCcache.end())
 176                 return it->second;
 177
 178         XGCValues val;
 179         XGetGCValues(display, getGCForeground(c), GCForeground, &val);
 180
 181         switch (lw) {
 182         case PainterBase::line_thin:
 183                 val.line_width = 0;
 184                 break;
 185         case PainterBase::line_thick:
 186                 val.line_width = 2;
 187                 break;
 188         }
 189
 190         switch (ls) {
 191         case PainterBase::line_solid:
 192                 val.line_style = LineSolid;
 193                 break;
 194         case PainterBase::line_onoffdash:
 195                 val.line_style = LineOnOffDash;
 196                 break;
 197         case PainterBase::line_doubledash:
 198                 val.line_style = LineDoubleDash;
 199                 break;
 200         }
 201
 202
 203         val.cap_style = CapRound;
 204         val.join_style = JoinRound;
 205         val.function = GXcopy;
 206
 207         return lineGCcache[index] =
 208                 XCreateGC(display, drawable,
 209                           GCForeground | GCLineStyle | GCLineWidth |
 210                           GCCapStyle | GCJoinStyle | GCFunction, &val);
 211 }
 212
 213
 214 // update GC cache after color redefinition
 215 void LyXColorHandler::updateColor (LColor::color c)
 216 {
 217         // color GC cache
 218         GC gc = colorGCcache[c];
 219         if (gc != 0) {
 220                 XFreeGC(display, gc);
 221                 colorGCcache[c] = NULL;
 222                 getGCForeground(c);
 223         }
 224
 225         // line GC cache
 226
 227         for (int ls = 0; ls < 3; ++ls)
 228                 for (int lw = 0; lw < 2; ++lw) {
 229                         int const index = lw + (ls << 1) + (c << 6);
 230                         LineGCCache::iterator it = lineGCcache.find(index);
 231                         if (it != lineGCcache.end()) {
 232                                 gc = it->second;
 233                                 XFreeGC(display, gc);
 234                                 lineGCcache.erase(it);
 235                                 getGCLinepars(PainterBase::line_style(ls),
 236                                               PainterBase::line_width(lw), c);
 237                         }
 238                 }
 239
 240 }
 241
 242 //
 243 boost::scoped_ptr<LyXColorHandler> lyxColorHandler;