Added new interface palette 'Dark'

Changes.txt

@@ -12,6 +12,11 @@
                               Release History
 ===========================================================================
 
+6.2.1 to 6.3 (XXXX XX, 2020)
+
+  * Added new interface palette 'Dark'. (TODO: DOC)
+
+
 6.2 to 6.2.1: (June 20, 2020)
 
   * Fixed Pitfall II ROM not working correctly.

src/emucore/FrameBuffer.cxx

@@ -862,6 +862,7 @@ void FrameBuffer::setUIPalette()
   const UIPaletteArray& ui_palette =
      (myOSystem.settings().getString("uipalette") == "classic") ? ourClassicUIPalette :
      (myOSystem.settings().getString("uipalette") == "light")   ? ourLightUIPalette :
+     (myOSystem.settings().getString("uipalette") == "dark")    ? ourDarkUIPalette :
       ourStandardUIPalette;
 
   for(size_t i = 0, j = myFullPalette.size() - ui_palette.size();
@@ -1553,3 +1554,16 @@ UIPaletteArray FrameBuffer::ourLightUIPalette = {
     0xffffff, 0x333333, 0xf0f0f0, 0x808080, 0xc0c0c0            // other
   }
 };
+
+UIPaletteArray FrameBuffer::ourDarkUIPalette = {
+  { 0x646464, 0xc0c0c0, 0x3c3c3c, 0x282828, 0x989898,           // base
+    0xc0c0c0, 0x1567a5, 0x0059a3, 0xc0c0c0,                     // text
+    0x202020, 0x000000, 0x0059a3, 0xb0b0b0,                     // UI elements
+    0x282828, 0x00467f, 0x646464, 0x0059a3, 0xc0c0c0, 0xc0c0c0, // buttons
+    0x989898,                                                   // checkbox
+    0x3c3c3c, 0x646464,                                         // scrollbar
+    0x7f2020, 0xc0c0c0, 0xe00000, 0xc00000,                     // debugger
+    0x989898, 0x0059a3, 0x3c3c3c, 0x000000, 0x3c3c3c,           // slider
+    0x000000, 0x989898, 0x202020, 0x646464, 0x3c3c3c            // other
+  }
+};

src/emucore/FrameBuffer.hxx

@@ -714,7 +714,8 @@ class FrameBuffer
 
     FullPaletteArray myFullPalette;
     // Holds UI palette data (for each variation)
-    static UIPaletteArray ourStandardUIPalette, ourClassicUIPalette, ourLightUIPalette;
+    static UIPaletteArray ourStandardUIPalette, ourClassicUIPalette, 
+      ourLightUIPalette, ourDarkUIPalette;
 
   private:
     // Following constructors and assignment operators not supported

src/emucore/Settings.cxx

@@ -524,7 +524,8 @@ void Settings::usage() const
     << "                                launcher\n"
     << "  -romloadcount <number>       Number of ROM to load next from multicard\n"
     << "  -uipalette    <standard|     Selects GUI theme\n"
-    << "                 classic|light>\n"
+    << "                 classic|\n"
+    << "                 light|dark>\n"
     << "  -hidpi        <0|1>          Enable HiDPI mode\n"
     << "  -dialogfont   <small|        Use the specified font in the dialogs\n"
     << "                 low_medium|\n"

src/gui/UIDialog.cxx

@@ -85,6 +85,7 @@ UIDialog::UIDialog(OSystem& osystem, DialogContainer& parent,
   VarList::push_back(items, "Standard", "standard");
   VarList::push_back(items, "Classic", "classic");
   VarList::push_back(items, "Light", "light");
+  VarList::push_back(items, "Dark", "dark");
   myPalettePopup = new PopUpWidget(myTab, font, xpos, ypos, pwidth, lineHeight,
                                    items, "Theme      ", lwidth);
   wid.push_back(myPalettePopup);