initialize blitterags leny/lenx from ncvisual

src/lib/direct.c

@@ -1203,6 +1203,7 @@ int ncdirect_stream(ncdirect* n, const char* filename, ncstreamcb streamer,
     if(x > 0){
       ncdirect_cursor_left(n, x);
     }
+    // FIXME what about vopts->beg{yx} and vopts->len{yx}?
     ncdirectv* v = ncdirect_render_visual(n, ncv, vopts->blitter, vopts->scaling,
                                           0, 0, (vopts->flags & NCVISUAL_OPTION_ADDALPHA) ?
                                                  vopts->transcolor | 0x1000000ul : 0);

src/lib/visual.c

@@ -654,6 +654,8 @@ ncplane* ncvisual_render_cells(notcurses* nc, ncvisual* ncv, const struct blitse
   }
   bargs.begy = begy;
   bargs.begx = begx;
+  bargs.leny = leny;
+  bargs.lenx = lenx;
   bargs.u.cell.placey = placey;
   bargs.u.cell.placex = placex;
   bargs.u.cell.blendcolors = flags & NCVISUAL_OPTION_BLEND;
@@ -772,8 +774,8 @@ ncplane* ncvisual_render_pixels(notcurses* nc, ncvisual* ncv, const struct blits
       disppixx -= absplacex * nc->tcache.cellpixx;
       disppixy -= absplacey * nc->tcache.cellpixy;
     }else{
-      disppixx = ncv->pixx;
-      disppixy = ncv->pixy;
+      disppixx = lenx;
+      disppixy = leny;
     }
     if(scaling == NCSCALE_SCALE || scaling == NCSCALE_SCALE_HIRES){
       clamp_to_sixelmax(&nc->tcache, &disppixy, &disppixx, &outy, scaling);
@@ -795,6 +797,8 @@ ncplane* ncvisual_render_pixels(notcurses* nc, ncvisual* ncv, const struct blits
   }
   bargs.begy = begy;
   bargs.begx = begx;
+  bargs.leny = leny;
+  bargs.lenx = lenx;
   bargs.u.pixel.celldimx = nc->tcache.cellpixx;
   bargs.u.pixel.celldimy = nc->tcache.cellpixy;
   bargs.u.pixel.colorregs = nc->tcache.color_registers;