Remove display-posterizing code. It's been dead 3 years.

Signed-off-by: John Hood <cgull@glup.org>

src/examples/termemu.cc

@@ -187,8 +187,6 @@ static bool tick( Terminal::Framebuffer &state, Terminal::Framebuffer &new_frame
 
   if ( (!initialized)
        || (diff >= 0.02) ) {
-    display.downgrade( new_frame );
-
     std::string update = display.new_frame( initialized, state, new_frame );
     swrite( STDOUT_FILENO, update.c_str() );
     state = new_frame;

src/frontend/stmclient.cc

@@ -268,9 +268,6 @@ void STMClient::output_new_frame( void )
   /* apply local overlays */
   overlays.apply( new_state );
 
-  /* apply any mutations */
-  display.downgrade( new_state );
-
   /* calculate minimal difference from where we are */
   const string diff( display.new_frame( !repaint_requested,
 					local_framebuffer,

src/terminal/terminaldisplay.h

@@ -75,15 +75,11 @@ namespace Terminal {
 
     bool has_title; /* supports window title and icon name */
 
-    int posterize_colors; /* downsample input colors >8 to [0..7] */
-
     const char *smcup, *rmcup; /* enter and exit alternate screen mode */
 
     bool put_row( bool initialized, FrameState &frame, const Framebuffer &f, int frame_y, const Row &old_row, bool wrap ) const;
 
   public:
-    void downgrade( Framebuffer &f ) const { if ( posterize_colors ) { f.posterize(); } }
-
     std::string open() const;
     std::string close() const;
 

src/terminal/terminaldisplayinit.cc

@@ -90,7 +90,7 @@ const char *Display::ti_str( const char *capname )
 }
 
 Display::Display( bool use_environment )
-  : has_ech( true ), has_bce( true ), has_title( true ), posterize_colors( 0 ), smcup( NULL ), rmcup( NULL )
+  : has_ech( true ), has_bce( true ), has_title( true ), smcup( NULL ), rmcup( NULL )
 {
   if ( use_environment ) {
     int errret = -2;
@@ -141,12 +141,6 @@ Display::Display( bool use_environment )
       }
     }
 
-    /* posterization disabled because server now only advertises
-       xterm-256color when client has colors = 256 */
-    /*
-    posterize_colors = ti_num( "colors" ) < 256;
-    */
-
     if ( !getenv( "MOSH_NO_TERM_INIT" ) ) {
       smcup = ti_str("smcup");
       rmcup = ti_str("rmcup");

src/terminal/terminalframebuffer.cc

@@ -398,19 +398,6 @@ void Framebuffer::soft_reset( void )
   ds.clear_saved_cursor();
 }
 
-void Framebuffer::posterize( void )
-{
-  for ( rows_type::iterator i = rows.begin();
-        i != rows.end();
-        i++ ) {
-    for ( Row::cells_type::iterator j = (*i)->cells.begin();
-          j != (*i)->cells.end();
-          j++ ) {
-      j->renditions.posterize();
-    }
-  }
-}
-
 void Framebuffer::resize( int s_width, int s_height )
 {
   assert( s_width > 0 );
@@ -571,59 +558,6 @@ std::string Renditions::sgr( void ) const
   return ret;
 }
 
-/* Reduce 256 "standard" colors to the 8 ANSI colors. */
-
-/* Terminal emulators generally agree on the (R',G',B') values of the
-   "standard" 256-color palette beyond #15, but for the first 16
-   colors there is disagreement. Most terminal emulators are roughly
-   self-consistent, except on Ubuntu's gnome-terminal where "ANSI
-   blue" (#4) has been replaced with the aubergine system-wide
-   color. See
-   https://lists.ubuntu.com/archives/ubuntu-devel/2011-March/032726.html
-
-   Terminal emulators that advertise "xterm" are inconsistent on the
-   handling of initc to change the contents of a cell in the color
-   palette. On RIS (reset to initial state) or choosing reset from
-   the user interface, xterm resets all entries, but gnome-terminal
-   only resets entries beyond 16. (rxvt doesn't reset any entries,
-   and Terminal.app ignores initc.) On initc, xterm applies changes
-   immediately (but slowly), but gnome-terminal's changes are only
-   prospective unless the user resizes the terminal.
-
-   mosh ignores initc for now, despite advertising xterm-256color. */
-
-/* Table mapping common color cube for [16 .. 255]
-   to xterm's system colors (0 .. 7) with closest
-   CIE deltaE(2000). */
-static const char standard_posterization[] = {
-  0, 1, 2, 3, 4, 5, 6, 7, 7, 1, 2, 3, 4, 5, 6, 7,
-  0, 4, 4, 4, 4, 4, 0, 0, 4, 4, 4, 4, 2, 6, 6, 6,
-  6, 4, 2, 2, 6, 6, 6, 6, 2, 2, 2, 6, 6, 6, 2, 2,
-  2, 2, 6, 6, 1, 4, 4, 4, 4, 4, 0, 0, 4, 4, 4, 4,
-  2, 2, 6, 6, 4, 5, 2, 2, 6, 6, 6, 6, 2, 2, 2, 6,
-  6, 6, 2, 2, 2, 2, 6, 6, 1, 5, 5, 4, 4, 4, 1, 1,
-  5, 5, 5, 5, 3, 3, 7, 5, 5, 5, 2, 2, 2, 6, 7, 7,
-  2, 2, 2, 6, 6, 6, 2, 2, 2, 2, 6, 6, 1, 5, 5, 5,
-  5, 5, 1, 1, 5, 5, 5, 5, 3, 1, 7, 5, 5, 5, 3, 3,
-  3, 7, 7, 7, 3, 3, 2, 7, 6, 7, 3, 2, 2, 2, 6, 6,
-  1, 5, 5, 5, 5, 5, 1, 1, 5, 5, 5, 5, 3, 1, 1, 5,
-  5, 5, 3, 3, 7, 7, 7, 7, 3, 3, 3, 7, 7, 7, 3, 3,
-  3, 3, 7, 7, 1, 1, 5, 5, 5, 5, 1, 1, 5, 5, 5, 5,
-  1, 1, 1, 5, 5, 5, 3, 7, 7, 7, 7, 7, 3, 3, 3, 7,
-  7, 7, 3, 3, 3, 3, 7, 7, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 1, 1, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7 };
-
-void Renditions::posterize( void )
-{
-  if ( foreground_color ) {
-    foreground_color = 30 + standard_posterization[ foreground_color - 30 ];
-  }
-
-  if ( background_color ) {
-    background_color = 40 + standard_posterization[ background_color - 40 ];
-  }
-}
-
 void Row::reset( color_type background_color )
 {
   gen = get_gen();

src/terminal/terminalframebuffer.h

@@ -68,8 +68,6 @@ namespace Terminal {
     void set_rendition( color_type num );
     std::string sgr( void ) const;
 
-    void posterize( void );
-
     bool operator==( const Renditions &x ) const
     {
       return ( attributes == x.attributes )
@@ -428,8 +426,6 @@ namespace Terminal {
     void reset_cell( Cell *c ) { c->reset( ds.get_background_rendition() ); }
     void reset_row( Row *r ) { r->reset( ds.get_background_rendition() ); }
 
-    void posterize( void );
-
     void ring_bell( void ) { bell_count++; }
     unsigned int get_bell_count( void ) const { return bell_count; }