Can actually use it to find glyphs now.

render.cpp

@@ -50,6 +50,12 @@ sf::Sprite &SFMLRender::get_text_sprite(wchar_t tile) {
   return $sprites[tile];
 }
 
+void SFMLRender::clear_cache() {
+  $sprites.clear();
+  $font.loadFromFile("./assets/text.otf");
+  $font.setSmooth(false);
+  $ui_text.setFont($font);
+}
 
 void SFMLRender::resize_grid(int new_size, Panel &panel_out) {
   auto glyph = $font.getGlyph($config.bg_tile, new_size, false);

render.hpp

@@ -68,5 +68,6 @@ struct SFMLRender {
   void clear() { $window.clear(); }
   void display() { $window.display(); }
   bool mouse_position(Panel &panel, Point &out);
+  void clear_cache();
   static void init_terminal();
 };

tools/designer.cpp

@@ -52,12 +52,20 @@ struct FontGrid {
   }
 
   string from_unicode(wstring input) {
+    try {
       return $converter.to_bytes(input);
+    } catch(...) {
+      return "?";
+    }
   }
 
   wchar_t to_unicode_char(size_t x, size_t y) {
-    string input = $chars[y][x];
+    try {
+      string input = $chars[y][x]; // BUG: bounds check this instead
       return $converter.from_bytes(input)[0];
+    } catch(...) {
+      return L'?';
+    }
   }
 
   string at(size_t x, size_t y) {
@@ -87,7 +95,7 @@ class GUI {
   Canvas $canvas;
   SFMLRender $renderer;
   FontGrid $font_grid;
-  wchar_t $start_char = L'\ua66b';
+  wchar_t $start_char = L'\u28cc';
   wchar_t $fill_char = WCHAR_MIN;
   WhatTheColor $fg_color;
   WhatTheColor $bg_color;
@@ -143,7 +151,7 @@ class GUI {
         return hbox({
           hflow(
               vbox(
-                text(format("\\u{:x}", int($fill_char))) | border,
+                text(format("\\u{:x} {} MIN: {}, MAX: {}", int($fill_char), int($fill_char), WCHAR_MIN, WCHAR_MAX)) | border,
                 separator(),
                 text(format("FG H: {}, S: {}, V: {}",
                     $fg_color.h, $fg_color.s, $fg_color.v)) | border,
@@ -191,7 +199,6 @@ class GUI {
   bool handle_ui_events() {
     bool event_happened;
     using KB = sf::Keyboard;
-    using MOUSE = sf::Mouse;
     sf::Event event;
     int font_size = $renderer.font_size();
 
@@ -200,21 +207,22 @@ class GUI {
         shutdown();
         return true;
       } else if(event.type ==  sf::Event::KeyPressed) {
-        println("KEY PRESSED");
         if(KB::isKeyPressed(KB::Up)) {
-          $start_char = std::min(WCHAR_MAX, $start_char + $font_grid.page_size());
+          $start_char = std::max(WCHAR_MIN+1, $start_char - $font_grid.page_size());
           $font_grid.render($start_char, false);
           event_happened = true;
+          $renderer.clear_cache();
         } else if(KB::isKeyPressed(KB::Down)) {
-          $start_char = std::max(WCHAR_MIN+1, $start_char - $font_grid.page_size());
+          $start_char = std::min(WCHAR_MAX, $start_char + $font_grid.page_size());
           $font_grid.render($start_char, false);
+          $renderer.clear_cache();
         } else if(KB::isKeyPressed(KB::Equal)) {
           resize_fonts(font_size + 10);
         } else if(KB::isKeyPressed(KB::Hyphen)) {
           resize_fonts(font_size - 10);
           event_happened = true;
         }
-      } else if(MOUSE::isButtonPressed(MOUSE::Left)) {
+      } else if(sf::Mouse::isButtonPressed(sf::Mouse::Left)) {
         Point pos;
         if($renderer.mouse_position($font_view, pos)) {
           select_cell(pos);
@@ -222,6 +230,8 @@ class GUI {
         } else if($renderer.mouse_position($status_ui, pos)) {
           $status_ui.mouse_click(Mouse::Button::Left, pos);
         }
+      } else if(sf::Mouse::isButtonPressed(sf::Mouse::Right)) {
+        deselect_cell();
       }
     }