keller demo #736

src/demo/keller.c

@@ -1,6 +1,51 @@
 #include "demo.h"
 
-int keller_demo(struct notcurses* nc){
-  // FIXME
+// show it with each blitter, with a legend
+static int
+visualize(struct notcurses* nc, struct ncvisual* ncv){
+  for(ncblitter_e b = NCBLIT_DEFAULT + 1 ; b < NCBLIT_SIXEL ; ++b){
+    struct timespec ts = { .tv_sec = 1, .tv_nsec = 0, };
+    struct ncvisual_options vopts = {
+      .scaling = NCSCALE_STRETCH,
+      .blitter = b,
+    };
+    struct ncplane* n = ncvisual_render(nc, ncv, &vopts);
+    if(n == NULL){
+      return -1;
+    }
+    const char* name = notcurses_str_blitter(b);
+    ncplane_set_bg_rgb(n, 0);
+    int scalex, scaley, truey, truex;
+    ncvisual_geom(nc, ncv, &vopts, &truey, &truex, &scaley, &scalex);
+    ncplane_printf_aligned(n, ncplane_dim_y(n) / 2 - 1, NCALIGN_CENTER,
+                           "%dx%d", truex, truey);
+    ncplane_putstr_aligned(n, ncplane_dim_y(n) / 2, NCALIGN_CENTER, name);
+    ncplane_printf_aligned(n, ncplane_dim_y(n) / 2 + 1, NCALIGN_CENTER,
+                           "%d:%d pixels -> cell", scalex, scaley);
+    int ret = demo_render(nc);
+    demo_nanosleep(nc, &ts);
+    ncplane_destroy(n);
+    if(ret){
+      return ret;
+    }
+  }
   return 0;
 }
+
+int keller_demo(struct notcurses* nc){
+  if(!notcurses_canopen_images(nc)){
+    return 0;
+  }
+  char* file = find_data("covid19.jpg");
+  if(file == NULL){
+    return -1;
+  }
+  struct ncvisual* ncv = ncvisual_from_file(file);
+  free(file);
+  if(ncv == NULL){
+    return -1;
+  }
+  int r = visualize(nc, ncv);
+  ncvisual_destroy(ncv);
+  return r;
+}