send palette updates (initc) #230

src/lib/internal.h

@@ -164,6 +164,7 @@ typedef struct notcurses {
   char* smkx;     // enter keypad transmit mode (keypad_xmit)
   char* rmkx;     // leave keypad transmit mode (keypad_local)
   char* getm;     // get mouse events
+  char* initc;    // set a palette entry's RGB value
   bool RGBflag;   // terminfo-reported "RGB" flag for 24bpc directcolor
   bool CCCflag;   // terminfo-reported "CCC" flag for palette set capability
 
@@ -183,6 +184,7 @@ typedef struct notcurses {
   unsigned inputbuf_valid_starts;
   unsigned inputbuf_write_at;
   palette256 palette; // 256-indexed palette can be used instead of RGB
+  bool palette_damage[256]; // FIXME derive this value somehow
   struct esctrie* inputescapes; // trie of input escapes -> ncspecial_keys
 } notcurses;
 

src/lib/notcurses.c

@@ -496,7 +496,12 @@ interrogate_terminfo(notcurses* nc, const notcurses_options* opts){
     const char* cterm = getenv("COLORTERM");
     nc->RGBflag = cterm && (strcmp(cterm, "truecolor") == 0 || strcmp(cterm, "24bit") == 0);
   }
+  term_verify_seq(&nc->initc, "initc");
+  if(nc->initc == NULL){
     nc->CCCflag = tigetflag("ccc") == 1;
+  }else{
+    nc->CCCflag = false;
+  }
   if((nc->colors = tigetnum("colors")) <= 0){
     if(!opts->suppress_banner){
       fprintf(stderr, "This terminal doesn't appear to support colors\n");
@@ -700,6 +705,8 @@ notcurses* notcurses_init(const notcurses_options* opts, FILE* outfp){
   ret->inputescapes = NULL;
   ret->ttyinfp = stdin; // FIXME
   memset(&ret->rstate, 0, sizeof(ret->rstate));
+  memset(&ret->palette_damage, 0, sizeof(ret->palette_damage));
+  memset(&ret->palette, 0, sizeof(ret->palette));
   ret->lastframe = NULL;
   ret->lfdimy = 0;
   ret->lfdimx = 0;

src/lib/render.c

@@ -594,6 +594,21 @@ term_fg_rgb8(notcurses* nc, FILE* out, unsigned r, unsigned g, unsigned b){
   return 0;
 }
 
+static inline int
+update_palette(notcurses* nc, FILE* out){
+  if(nc->CCCflag){
+    for(size_t damageidx = 0 ; damageidx < sizeof(nc->palette.chans) / sizeof(*nc->palette.chans) ; ++damageidx){
+      unsigned r, g, b;
+      if(nc->palette_damage[damageidx]){
+        channel_rgb(nc->palette.chans[damageidx], &r, &g, &b);
+        term_emit("initc", tiparm(nc->initc, damageidx, r, g, b), out, false);
+        nc->palette_damage[damageidx] = false;
+      }
+    }
+  }
+  return 0;
+}
+
 // Producing the frame requires three steps:
 //  * render -- build up a flat framebuffer from a set of ncplanes
 //  * rasterize -- build up a UTF-8 stream of escapes and EGCs
@@ -611,6 +626,7 @@ notcurses_rasterize(notcurses* nc, const struct crender* rvec){
   // don't write a clearscreen. we only update things that have been changed.
   // we explicitly move the cursor at the beginning of each output line, so no
   // need to home it expliticly.
+  update_palette(nc, out);
   for(y = 0 ; y < nc->stdscr->leny ; ++y){
     // how many characters have we elided? it's not worthwhile to invoke a
     // cursor movement with cup if we only elided one or two. set to INT_MAX