ncvisual_render: direct cell_load into framebuffer

Saves about 10% of wall clock time on 'eagle', nice.

src/lib/internal.h

@@ -128,6 +128,7 @@ typedef struct notcurses {
   char* italoff;  // CELL_STYLE_ITALIC (disable)
   char* smkx;     // enter keypad transmit mode (keypad_xmit)
   char* rmkx;     // leave keypad transmit mode (keypad_local)
+  char* getm;     // get mouse events
   bool RGBflag;   // terminfo-reported "RGB" flag for 24bpc directcolor
   bool CCCflag;   // terminfo-reported "CCC" flag for palette set capability
 
@@ -227,6 +228,8 @@ extended_gcluster(const ncplane* n, const cell* c){
   return egcpool_extended_gcluster(&n->pool, c);
 }
 
+cell* ncplane_cell_ref_yx(ncplane* n, int y, int x);
+
 #define NANOSECS_IN_SEC 1000000000
 
 #ifdef __cplusplus

src/lib/libav.c

@@ -319,39 +319,36 @@ int ncvisual_render(const ncvisual* ncv, int begy, int begx, int leny, int lenx)
       const unsigned char* rgbbase_down = data + (linesize * (visy + 1)) + (visx * bpp / CHAR_BIT);
 /*fprintf(stderr, "[%04d/%04d] %p bpp: %d lsize: %d %02x %02x %02x %02x\n",
         y, x, rgbbase, bpp, linesize, rgbbase[0], rgbbase[1], rgbbase[2], rgbbase[3]);*/
-      cell c = CELL_TRIVIAL_INITIALIZER;
+      cell* c = ncplane_cell_ref_yx(ncv->ncp, y, x);
       // use the default for the background, as that's the only way it's
       // effective in that case anyway
+      c->channels = 0;
+      c->attrword = 0;
       if(!rgbbase_up[3] || !rgbbase_down[3]){
-        cell_set_bg_alpha(&c, CELL_ALPHA_TRANSPARENT);
+        cell_set_bg_alpha(c, CELL_ALPHA_TRANSPARENT);
         if(!rgbbase_up[3] && !rgbbase_down[3]){
-          if(cell_load(ncv->ncp, &c, " ") <= 0){
+          if(cell_load(ncv->ncp, c, " ") <= 0){
             return -1;
           }
-          cell_set_fg_alpha(&c, CELL_ALPHA_TRANSPARENT);
+          cell_set_fg_alpha(c, CELL_ALPHA_TRANSPARENT);
         }else if(!rgbbase_up[3]){ // down has the color
-          if(cell_load(ncv->ncp, &c, "\u2584") <= 0){ // lower half block
+          if(cell_load(ncv->ncp, c, "\u2584") <= 0){ // lower half block
             return -1;
           }
-          cell_set_fg_rgb(&c, rgbbase_down[0], rgbbase_down[1], rgbbase_down[2]);
+          cell_set_fg_rgb(c, rgbbase_down[0], rgbbase_down[1], rgbbase_down[2]);
         }else{ // up has the color
-          if(cell_load(ncv->ncp, &c, "\u2580") <= 0){ // upper half block
+          if(cell_load(ncv->ncp, c, "\u2580") <= 0){ // upper half block
             return -1;
           }
-          cell_set_fg_rgb(&c, rgbbase_up[0], rgbbase_up[1], rgbbase_up[2]);
+          cell_set_fg_rgb(c, rgbbase_up[0], rgbbase_up[1], rgbbase_up[2]);
         }
       }else{
-        cell_set_fg_rgb(&c, rgbbase_up[0], rgbbase_up[1], rgbbase_up[2]);
-        cell_set_bg_rgb(&c, rgbbase_down[0], rgbbase_down[1], rgbbase_down[2]);
-        if(cell_load(ncv->ncp, &c, "\u2580") <= 0){ // upper half block
+        cell_set_fg_rgb(c, rgbbase_up[0], rgbbase_up[1], rgbbase_up[2]);
+        cell_set_bg_rgb(c, rgbbase_down[0], rgbbase_down[1], rgbbase_down[2]);
+        if(cell_load(ncv->ncp, c, "\u2580") <= 0){ // upper half block
           return -1;
         }
       }
-      if(ncplane_putc(ncv->ncp, &c) <= 0){
-        cell_release(ncv->ncp, &c);
-        return -1;
-      }
-      cell_release(ncv->ncp, &c);
     }
   }
   return 0;

src/lib/notcurses.c

@@ -213,6 +213,10 @@ int ncplane_at_yx(ncplane* n, int y, int x, cell* c){
   return cell_duplicate(n, c, &n->fb[fbcellidx(n, y, x)]);
 }
 
+cell* ncplane_cell_ref_yx(ncplane* n, int y, int x){
+  return &n->fb[fbcellidx(n, y, x)];
+}
+
 void ncplane_dim_yx(const ncplane* n, int* rows, int* cols){
   if(rows){
     *rows = n->leny;