Determine xterm maximum number of colors via OSC 4

ChangeLog

@@ -1,3 +1,8 @@
+2016-11-05  Markus Gans  <guru.mail@muenster.de>
+	* Determine xterm maximum number of colors via OSC 4
+	* The method clearArea can now fill the background 
+	  with certain character
+
 2016-11-03  Markus Gans  <guru.mail@muenster.de>
 	* xterm should be able to use at least 16 colors
 

src/fterm.cpp

@@ -813,6 +813,39 @@ const FString FTerm::getXTermTitle()
   return title;
 }
 
+//----------------------------------------------------------------------
+const FString FTerm::getXTermColorName (int color)
+{
+  FString color_str("");
+
+  if ( raw_mode && non_blocking_stdin )
+  {
+    int n;
+    int c = color;
+    int digits = 0;
+
+    while ( c /= 10 )
+      digits++;
+
+    char temp[512] = {};
+    putstringf (OSC "4;%d;?" BEL, color);  // get color
+    std::fflush(stdout);
+    usleep(150000);  // wait 150 ms
+
+    // read the terminal answer
+    n = int(read(fileno(stdin), &temp, sizeof(temp)-1));
+
+    // BEL + '\0' = string terminator
+    if ( n >= 6 && temp[n-1] == BEL[0] && temp[n] == '\0' )
+    {
+      temp[n-1] = '\0';
+      color_str = static_cast<char*>(temp + 6 + digits);
+    }
+  }
+
+  return color_str;
+}
+
 //----------------------------------------------------------------------
 void FTerm::setXTermCursorStyle (fc::xtermCursorStyle style)
 {
@@ -1544,6 +1577,16 @@ bool FTerm::gpmMouse (bool on)
 
 
 // private methods of FTerm
+//----------------------------------------------------------------------
+int FTerm::isConsole()
+{
+  char arg = 0;
+  // get keyboard type an compare
+  return (  isatty (fd_tty)
+         && ioctl(fd_tty, KDGKBTYPE, &arg) == 0
+         && ((arg == KB_101) || (arg == KB_84)) );
+}
+
 //----------------------------------------------------------------------
 inline uInt16 FTerm::getInputStatusRegisterOne()
 {
@@ -1705,16 +1748,6 @@ int FTerm::closeConsole()
     return -1;
 }
 
-//----------------------------------------------------------------------
-int FTerm::isConsole()
-{
-  char arg = 0;
-  // get keyboard type an compare
-  return (  isatty (fd_tty)
-         && ioctl(fd_tty, KDGKBTYPE, &arg) == 0
-         && ((arg == KB_101) || (arg == KB_84)) );
-}
-
 //----------------------------------------------------------------------
 void FTerm::identifyTermType()
 {
@@ -2954,6 +2987,22 @@ void FTerm::init()
   // Identify the terminal via the secondary device attributes (SEC_DA)
   new_termtype = parseSecDA (new_termtype);
 
+  if ( ! color256 && getXTermColorName(0) != "" )
+  {
+    if ( getXTermColorName(256) != "" )
+    {
+      new_termtype = const_cast<char*>("xterm-256color");
+    }
+    else if ( FTermcap::max_color < 88 && getXTermColorName(87) != "" )
+    {
+      new_termtype = const_cast<char*>("xterm-88color");
+    }
+    else if ( FTermcap::max_color < 16 && getXTermColorName(15) != "" )
+    {
+      new_termtype = const_cast<char*>("xterm-16color");
+    }
+  }
+
   unsetRawMode();
   // ...end of terminal detection
 
@@ -3069,19 +3118,7 @@ void FTerm::init()
   }
 
   setXTermCursorStyle(fc::blinking_underline);
-  setXTermMouseBackground("rgb:ffff/ffff/ffff");
+  setXTermColors();
-  setXTermMouseForeground ("rgb:0000/0000/0000");
-
-  if ( ! gnome_terminal )
-    setXTermCursorColor("rgb:ffff/ffff/ffff");
-
-  if ( ! (mintty_terminal || rxvt_terminal || screen_terminal) )
-  {
-    // mintty and rxvt can't reset these settings
-    setXTermBackground("rgb:8080/a4a4/ecec");
-    setXTermForeground("rgb:0000/0000/0000");
-    setXTermHighlightBackground("rgb:8686/8686/8686");
-  }
 
   setRawMode();
 
@@ -3313,6 +3350,24 @@ void FTerm::finish()
     delete opti_move;
 }
 
+//----------------------------------------------------------------------
+void FTerm::setXTermColors()
+{
+  setXTermMouseBackground("rgb:ffff/ffff/ffff");
+  setXTermMouseForeground ("rgb:0000/0000/0000");
+
+  if ( ! gnome_terminal )
+    setXTermCursorColor("rgb:ffff/ffff/ffff");
+
+  if ( ! (mintty_terminal || rxvt_terminal || screen_terminal) )
+  {
+    // mintty and rxvt can't reset these settings
+    setXTermBackground("rgb:8080/a4a4/ecec");
+    setXTermForeground("rgb:0000/0000/0000");
+    setXTermHighlightBackground("rgb:8686/8686/8686");
+  }
+}
+
 //----------------------------------------------------------------------
 uInt FTerm::cp437_to_unicode (uChar c)
 {

src/fterm.h

@@ -168,6 +168,7 @@ class FTerm
    static void          setKDECursor (fc::kdeKonsoleCursorShape);
    static const FString getXTermFont();
    static const FString getXTermTitle();
+   static const FString getXTermColorName (int);
    static void          setXTermCursorStyle (fc::xtermCursorStyle);
    static void          setXTermTitle (const FString&);
    static void          setXTermForeground (const FString&);
@@ -201,6 +202,7 @@ class FTerm
 
    // function pointer -> static function
    static int           (*Fputchar)(int);
+  
    static void          putstringf (const char*, ...)
    #if defined(__clang__)
      __attribute__((__format__ (__printf__, 1, 2)))
@@ -267,6 +269,9 @@ class FTerm
    // Disable assignment operator (=)
    FTerm& operator = (const FTerm&);
 
+   // Inquiries
+   static int           isConsole();
+
    // Methods
    static uInt16        getInputStatusRegisterOne();
    static uChar         readAttributeController (uChar);
@@ -277,7 +282,6 @@ class FTerm
    static int           getFramebuffer_bpp();
    static int           openConsole();
    static int           closeConsole();
-   static int           isConsole();
    static void          identifyTermType();
    static int           getScreenFont();
    static int           setScreenFont (uChar*, uInt, uInt, uInt, bool = false);
@@ -296,6 +300,7 @@ class FTerm
    static void          init_encoding();
    void                 init();
    void                 finish();
+   static void          setXTermColors();
    static uInt          cp437_to_unicode (uChar);
    static void          signal_handler (int);
 

src/fvterm.cpp

@@ -121,19 +121,21 @@ bool FVTerm::hideCursor (bool on)
     char* hide_str = disableCursor();
 
     if ( hide_str )
+    {
       appendOutputBuffer (hide_str);
-
       hidden_cursor = true;  // global
     }
+  }
   else
   {
     char* show_str = enableCursor();
 
     if ( show_str )
+    {
       appendOutputBuffer (show_str);
-
       hidden_cursor = false;
     }
+  }
 
   flush_out();
 
@@ -1160,6 +1162,7 @@ void FVTerm::restoreVTerm (int x, int y, int w, int h)
                    || s_ch.code == fc::UpperHalfBlock
                    || s_ch.code == fc::LeftHalfBlock
                    || s_ch.code == fc::RightHalfBlock
+                   || s_ch.code == fc::MediumShade
                    || s_ch.code == fc::FullBlock )
                   s_ch.code = ' ';
 
@@ -1360,6 +1363,7 @@ void FVTerm::updateVTerm (term_area* area)
                || ch.code == fc::UpperHalfBlock
                || ch.code == fc::LeftHalfBlock
                || ch.code == fc::RightHalfBlock
+               || ch.code == fc::MediumShade
                || ch.code == fc::FullBlock )
               ch.code = ' ';
 
@@ -1388,6 +1392,7 @@ void FVTerm::updateVTerm (term_area* area)
                  || ch.code == fc::UpperHalfBlock
                  || ch.code == fc::LeftHalfBlock
                  || ch.code == fc::RightHalfBlock
+                 || ch.code == fc::MediumShade
                  || ch.code == fc::FullBlock )
                 ch.code = ' ';
 
@@ -1707,6 +1712,7 @@ void FVTerm::putArea (int ax, int ay, term_area* area)
                || ch.code == fc::UpperHalfBlock
                || ch.code == fc::LeftHalfBlock
                || ch.code == fc::RightHalfBlock
+               || ch.code == fc::MediumShade
                || ch.code == fc::FullBlock )
               ch.code = ' ';
 
@@ -1820,7 +1826,7 @@ void FVTerm::scrollAreaReverse (term_area* area)
 }
 
 //----------------------------------------------------------------------
-void FVTerm::clearArea (term_area* area)
+void FVTerm::clearArea (term_area* area, int fillchar)
 {
   // clear the area with the current attributes
   char_data nc;  // next character
@@ -1829,7 +1835,7 @@ void FVTerm::clearArea (term_area* area)
 
   // current attributes with a space character
   std::memcpy (&nc, &next_attribute, sizeof(char_data));
-  nc.code = ' ';
+  nc.code = fillchar;
 
   if ( ! area )
     return;

src/fvterm.h

@@ -279,7 +279,7 @@ class FVTerm : public FObject, public FTerm
    static void          putArea (int, int, term_area*);
    static void          scrollAreaForward (term_area*);
    static void          scrollAreaReverse (term_area*);
-   static void          clearArea (term_area*);
+   static void          clearArea (term_area*, int = ' ');
 
    static char_data     getCharacter ( character_type
                                      , const FPoint&

test/calculator.cpp

@@ -243,7 +243,7 @@ Calc::Calc (FWidget* parent)
   setText ("calculator");
   setGeometry (19, 6, 37, 18);
   addAccelerator('q');  // press 'q' to quit
-  setShadow();
+  //setShadow();
 
   for (int key=0; key < Calc::NUM_OF_BUTTONS; key++)
   {
@@ -372,6 +372,10 @@ void Calc::drawDispay()
 //----------------------------------------------------------------------
 void Calc::draw()
 {
+  setBold();
+  setColor (fc::Blue, fc::Cyan);
+  clearArea (vdesktop, fc::MediumShade);
+  unsetBold();
   FDialog::draw();
   drawDispay();
 }

test/transparent.cpp

@@ -79,7 +79,11 @@ void Transparent::draw()
   }
   else if ( type == inherit_background )
   {
+    if ( getMaxColor() > 8 )
       setColor(fc::Blue, fc::Black);
+    else
+      setColor(fc::Green, fc::Black);
+
     setInheritBackground();
   }
   else