3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
8 * Full author contact details are available in file CREDITS.
13 #include "ColorHandler.h"
19 #include "support/lstrings.h"
20 #include "support/tostr.h"
22 #include "lyx_forms.h"
24 #include <boost/scoped_array.hpp>
28 #ifndef CXX_GLOBAL_CSTD
40 string tostr(XColor const & col)
42 return bformat("(%1$s,%2$s,%3$s)",
49 } // namespace support
51 using support::bformat;
57 LyXColorHandler::LyXColorHandler()
58 : colorGCcache(LColor::ignore + 1)
60 display = fl_get_display();
61 drawable = XCreatePixmap(display,
62 RootWindow(display, fl_screen),
63 10, 10, fl_get_visual_depth());
65 colormap = fl_state[fl_get_vclass()].colormap;
67 for (string::size_type i = 0; i < colorGCcache.size(); ++i) {
73 LyXColorHandler::~LyXColorHandler()
75 // Release all the registered GCs
76 for (unsigned i = 0; i < colorGCcache.size(); ++i) {
77 if (colorGCcache[i] != 0) {
78 XFreeGC(display, colorGCcache[i]);
81 // Iterate over the line cache and Free the GCs
82 for (LineGCCache::iterator lit = lineGCcache.begin();
83 lit != lineGCcache.end(); ++lit) {
84 XFreeGC(display, lit->second);
89 unsigned long LyXColorHandler::colorPixel(LColor_color c)
92 XGetGCValues(display, getGCForeground(c), GCForeground, &val);
93 return val.foreground;
97 GC LyXColorHandler::getGCForeground(string const & s)
102 // Look up the RGB values for the color, and an approximate
103 // color that we can hope to get on this display.
104 if (XLookupColor(display, colormap, s.c_str(), &xcol, &ccol) == 0) {
106 _("LyX: Unknown X11 color %1$s\n"
107 " Using black instead, sorry!"),
109 unsigned long bla = BlackPixel(display,
110 DefaultScreen(display));
111 val.foreground = bla;
112 // Try the exact RGB values first, then the approximate.
113 } else if (XAllocColor(display, colormap, &xcol) != 0) {
114 if (lyxerr.debugging(Debug::GUI)) {
115 lyxerr << bformat(_("LyX: X11 color %1$s allocated"),
118 val.foreground = xcol.pixel;
120 // Here we are traversing the current colormap to find
121 // the color closest to the one we want.
122 Visual * vi = DefaultVisual(display, DefaultScreen(display));
124 boost::scoped_array<XColor> cmap(new XColor[vi->map_entries]);
126 for (int i = 0; i < vi->map_entries; ++i) {
129 XQueryColors(display, colormap, cmap.get(), vi->map_entries);
131 // Walk through the cmap and look for close colors.
132 int closest_pixel = 0;
133 double closest_distance = 1e20; // we want to minimize this
135 for (int t = 0; t < vi->map_entries; ++t) {
136 // The Euclidean distance between two points in
137 // a three-dimensional space, the RGB color-cube,
138 // is used as the distance measurement between two
141 // Since square-root is monotonous, we don't have to
142 // take the square-root to find the minimum, and thus
143 // we use the squared distance instead to be faster.
145 // If we want to get fancy, we could convert the RGB
146 // coordinates to a different color-cube, maybe HSV,
147 // but the RGB cube seems to work great. (Asger)
148 distance = pow(cmap[t].red - xcol.red, 2.0) +
149 pow(cmap[t].green - xcol.green, 2.0) +
150 pow(cmap[t].blue - xcol.blue, 2.0);
151 if (distance < closest_distance) {
152 closest_distance = distance;
158 _("LyX: Couldn't allocate '%1$s' with (r,g,b)=%3$s.\n"),
162 _(" Using closest allocated color with (r,g,b)=%1$s instead.\n"
163 "Pixel [%2$s] is used."),
164 tostr(cmap[closest_pixel]), ::tostr(closest_pixel)) << endl;
166 val.foreground = cmap[closest_pixel].pixel;
168 val.function = GXcopy;
169 return XCreateGC(display, drawable,
170 GCForeground | GCFunction, &val);
173 // Gets GC according to color
175 GC LyXColorHandler::getGCForeground(LColor_color c)
177 if (static_cast<unsigned>(c) >= colorGCcache.size()) {
178 colorGCcache.resize(c + 1, 0);
181 if (colorGCcache[c] != 0) {
182 return colorGCcache[c];
186 string const s = lcolor.getX11Name(c);
187 // Look up the RGB values for the color, and an approximate
188 // color that we can hope to get on this display.
189 if (XLookupColor(display, colormap, s.c_str(), &xcol, &ccol) == 0) {
191 _("LyX: Unknown X11 color %1$s for %2$s\n"),
192 s, lcolor.getGUIName(c)) << endl;
194 return colorGCcache[c] = getGCForeground(s);
199 GC LyXColorHandler::getGCLinepars(Painter::line_style ls,
200 Painter::line_width lw, LColor_color c)
202 //if (lyxerr.debugging()) {
203 // lyxerr << "Painter drawable: " << drawable() << endl;
206 int index = lw + (ls << 1) + (c << 6);
208 LineGCCache::iterator it = lineGCcache.find(index);
209 if (it != lineGCcache.end())
213 XGetGCValues(display, getGCForeground(c), GCForeground, &val);
216 case Painter::line_thin:
219 case Painter::line_thick:
225 case Painter::line_solid:
226 val.line_style = LineSolid;
228 case Painter::line_onoffdash:
229 val.line_style = LineOnOffDash;
234 val.cap_style = CapRound;
235 val.join_style = JoinRound;
236 val.function = GXcopy;
238 return lineGCcache[index] =
239 XCreateGC(display, drawable,
240 GCForeground | GCLineStyle | GCLineWidth |
241 GCCapStyle | GCJoinStyle | GCFunction, &val);
245 // update GC cache after color redefinition
246 void LyXColorHandler::updateColor (LColor_color c)
249 GC gc = colorGCcache[c];
251 XFreeGC(display, gc);
252 colorGCcache[c] = NULL;
258 for (int ls = 0; ls < 3; ++ls)
259 for (int lw = 0; lw < 2; ++lw) {
260 int const index = lw + (ls << 1) + (c << 6);
261 LineGCCache::iterator it = lineGCcache.find(index);
262 if (it != lineGCcache.end()) {
264 XFreeGC(display, gc);
265 lineGCcache.erase(it);
266 getGCLinepars(Painter::line_style(ls),
267 Painter::line_width(lw), c);
274 boost::scoped_ptr<LyXColorHandler> lyxColorHandler;
276 } // namespace frontend