Initial revision

git-svn-id: file:///fltk/svn/fltk/trunk@2 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 50 insertions, 0 deletions

diff --git a/src/Fl_own_colormap.cxx b/src/Fl_own_colormap.cxx
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+++ b/src/Fl_own_colormap.cxx
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+// Fl_own_colormap.C
+
+// Using the default system colormap can be a bad idea on PseudoColor
+// visuals, since typically every application uses the default colormap and
+// you can run out of colormap entries easily.
+//
+// The solution is to always create a new colormap on PseudoColor displays
+// and copy the first 16 colors from the default colormap so that we won't
+// get huge color changes when switching windows.
+
+#include <config.h>
+#include <FL/Fl.H>
+#include <FL/x.H>
+
+#ifdef WIN32
+// There is probably something relevant to do on MSWindows 8-bit displays
+// but I don't know what it is
+
+void Fl::own_colormap() {}
+
+#else
+// X version
+
+void Fl::own_colormap() {
+  fl_open_display();
+#if USE_COLORMAP
+  switch (fl_visual->c_class) {
+  case GrayScale :
+  case PseudoColor :
+  case DirectColor :
+    break;
+  default:
+    return; // don't do anything for non-colormapped visuals
+  }
+  int i;
+  XColor colors[16];
+  // Get the first 16 colors from the default colormap...
+  for (i = 0; i < 16; i ++) colors[i].pixel = i;
+  XQueryColors(fl_display, fl_colormap, colors, 16);
+  // Create a new colormap...
+  fl_colormap = XCreateColormap(fl_display,
+				RootWindow(fl_display,fl_screen),
+				fl_visual->visual, AllocNone);
+  // Copy those first 16 colors to our own colormap:
+  for (i = 0; i < 16; i ++)
+    XAllocColor(fl_display, fl_colormap, colors + i);
+#endif
+}
+
+#endif