fix android main loop, scale font texture

src/font.cpp

@@ -15,6 +15,7 @@ bool Font::load(const std::string& ttf, int font_size, float font_scale)
     LOG("Font::load %s", ttf.c_str());
     if (file.open(ttf.c_str()) && file.read_all())
     {
+        w = h = 512 * ceilf(font_scale);
         path = ttf;
         scale = font_scale;
         LOG("Font::load loaded");

src/font.h

@@ -12,8 +12,8 @@ enum class kFont : uint16_t
 class Font
 {
 public:
-    const int w = 512;
-    const int h = 512;
+    int w = 512;
+    int h = 512;
     const int num_chars = 96;
     const int start_char = 32;
     // {mix, max}