From 016a958a174e2f3e58182f7fd7dee6718fc87b98 Mon Sep 17 00:00:00 2001
From: Vadim Lopatin <coolreader.org@gmail.com>
Date: Wed, 28 Jan 2015 13:53:02 +0300
Subject: [PATCH] warn and fail if no freetype fonts found

---
 src/dlangui/graphics/ftfonts.d     |  5 +++++
 src/dlangui/platforms/sdl/sdlapp.d | 11 +++++++++++
 2 files changed, 16 insertions(+)

diff --git a/src/dlangui/graphics/ftfonts.d b/src/dlangui/graphics/ftfonts.d
index db0c767b..a03cefeb 100644
--- a/src/dlangui/graphics/ftfonts.d
+++ b/src/dlangui/graphics/ftfonts.d
@@ -564,6 +564,11 @@ class FreeTypeFontManager : FontManager {
         return true;
     }
 
+    /// returns number of registered fonts
+    @property int registeredFontCount() {
+        return cast(int)_fontFiles.length;
+    }
+
 }
 
 private int myabs(int n) { return n >= 0 ? n : -n; }
diff --git a/src/dlangui/platforms/sdl/sdlapp.d b/src/dlangui/platforms/sdl/sdlapp.d
index 035ba590..92c5af70 100644
--- a/src/dlangui/platforms/sdl/sdlapp.d
+++ b/src/dlangui/platforms/sdl/sdlapp.d
@@ -1133,6 +1133,17 @@ version (Windows) {
             ft.registerFont("/Library/Fonts/Georgia Italic.ttf", FontFamily.SansSerif, "Georgia", true, FontWeight.Normal);
             ft.registerFont("/Library/Fonts/Georgia Bold Italic.ttf", FontFamily.SansSerif, "Georgia", true, FontWeight.Bold);
         }
+
+        if (!ft.registeredFontCount) {
+            Log.e("******************************************************************");
+            Log.e("No font files found!!!");
+            Log.e("Currently, only hardcoded font paths implemented.");
+            Log.e("Probably you can modify sdlapp.d to add some fonts for your system.");
+            Log.e("TODO: use fontconfig");
+            Log.e("******************************************************************");
+            assert(false);
+        }
+
 		FontManager.instance = ft;
 
         return sdlmain(args);