Use light hinting mode iff hinting is enabled.

This makes use of TTF_SetFontHinting, which was ported from SDL_ttf for the occasion.

src/openrct2/drawing/string.c

@@ -805,7 +805,7 @@ static void ttf_draw_string_raw_ttf(rct_drawpixelinfo *dpi, const utf8 *text, te
                             // Centre of the glyph: use full colour.
                             *dst = colour;
                         }
-                        else if (*src > 80)
+                        else if (*src > 60)
                         {
                             // Simulate font hinting by shading the background colour instead.
                             if (info->flags & TEXT_DRAW_FLAG_OUTLINE)

src/openrct2/drawing/ttf.c

@@ -60,6 +60,7 @@ static TTF_Font * ttf_open_font(const utf8 * fontPath, sint32 ptSize);
 static void ttf_close_font(TTF_Font * font);
 static uint32 ttf_surface_cache_hash(TTF_Font * font, const utf8 * text);
 static void ttf_surface_cache_dispose(ttf_cache_entry * entry);
+static void ttf_surface_cache_dispose_all();
 static void ttf_getwidth_cache_dispose_all();
 static bool ttf_get_size(TTF_Font * font, const utf8 * text, sint32 * width, sint32 * height);
 static TTFSurface * ttf_render(TTF_Font * font, const utf8 * text);
@@ -72,7 +73,7 @@ bool ttf_initialise()
             return false;
         }
 
-        for (sint32 i = 0; i < 4; i++) {
+        for (sint32 i = 0; i < FONT_SIZE_COUNT; i++) {
             TTFFontDescriptor *fontDesc = &(gCurrentTTFFontSet->size[i]);
 
             utf8 fontPath[MAX_PATH];
@@ -86,7 +87,10 @@ bool ttf_initialise()
                 log_error("Unable to load '%s'", fontPath);
                 return false;
             }
+
         }
+
+        ttf_toggle_hinting();
         _ttfInitialised = true;
     }
     return true;
@@ -143,7 +147,7 @@ static void ttf_surface_cache_dispose(ttf_cache_entry *entry)
     }
 }
 
-void ttf_surface_cache_dispose_all()
+static void ttf_surface_cache_dispose_all()
 {
     for (sint32 i = 0; i < TTF_SURFACE_CACHE_SIZE; i++) {
         ttf_surface_cache_dispose(&_ttfSurfaceCache[i]);
@@ -151,6 +155,20 @@ void ttf_surface_cache_dispose_all()
     }
 }
 
+void ttf_toggle_hinting()
+{
+    for (sint32 i = 0; i < FONT_SIZE_COUNT; i++)
+    {
+        TTFFontDescriptor *fontDesc = &(gCurrentTTFFontSet->size[i]);
+        TTF_SetFontHinting(fontDesc->font, gConfigFonts.enable_hinting ? 1 : 0);
+    }
+
+    if (_ttfSurfaceCacheCount)
+    {
+        ttf_surface_cache_dispose_all();
+    }
+}
+
 TTFSurface * ttf_surface_cache_get_or_add(TTF_Font * font, const utf8 * text)
 {
     ttf_cache_entry *entry;

src/openrct2/drawing/ttf.h

@@ -43,8 +43,8 @@ extern "C" {
 #endif
 
 TTFFontDescriptor * ttf_get_font_from_sprite_base(uint16 spriteBase);
+void ttf_toggle_hinting();
 TTFSurface * ttf_surface_cache_get_or_add(TTF_Font * font, const utf8 * text);
-void ttf_surface_cache_dispose_all();
 uint32 ttf_getwidth_cache_get_or_add(TTF_Font * font, const utf8 * text);
 bool ttf_provides_glyph(const TTF_Font * font, codepoint_t codepoint);
 void ttf_free_surface(TTFSurface * surface);
@@ -57,6 +57,7 @@ int TTF_SizeUTF8(TTF_Font *font, const char *text, int *w, int *h);
 TTFSurface * TTF_RenderUTF8_Solid(TTF_Font *font, const char *text, uint32 colour);
 TTFSurface * TTF_RenderUTF8_Shaded(TTF_Font *font, const char *text, uint32 fg, uint32 bg);
 void TTF_CloseFont(TTF_Font *font);
+void TTF_SetFontHinting(TTF_Font* font, int hinting);
 void TTF_Quit(void);
 
 #ifdef __cplusplus

src/openrct2/drawing/ttf_sdlport.c

@@ -1433,6 +1433,20 @@ static bool CharacterIsDelimiter(char c, const char *delimiters)
     return false;
 }
 
+void TTF_SetFontHinting(TTF_Font* font, int hinting)
+{
+    if (hinting == TTF_HINTING_LIGHT)
+        font->hinting = FT_LOAD_TARGET_LIGHT;
+    else if (hinting == TTF_HINTING_MONO)
+        font->hinting = FT_LOAD_TARGET_MONO;
+    else if (hinting == TTF_HINTING_NONE)
+        font->hinting = FT_LOAD_NO_HINTING;
+    else
+        font->hinting = 0;
+
+    Flush_Cache(font);
+}
+
 void TTF_Quit(void)
 {
     if (TTF_initialized) {

src/openrct2/interface/console.c

@@ -1083,7 +1083,7 @@ static sint32 cc_set(const utf8 **argv, sint32 argc)
             gConfigFonts.enable_hinting = (int_val[0] != 0);
             config_save_default();
             console_execute_silent("get enable_hinting");
-            ttf_surface_cache_dispose_all();
+            ttf_toggle_hinting();
         }
 #endif
         else if (invalidArgs) {