Fixed rendering of Thai and units of char spacing

training/stringrenderer.cpp

@@ -188,13 +188,14 @@ void StringRenderer::SetLayoutProperties() {
     swap(max_width, max_height);
   }
   pango_layout_set_width(layout_, max_width * PANGO_SCALE);
-  pango_layout_set_wrap(layout_, PANGO_WRAP_WORD);
+  // Ultra-wide Thai strings need to wrap at char level.
+  pango_layout_set_wrap(layout_, PANGO_WRAP_WORD_CHAR);
 
   // Adjust character spacing
   PangoAttrList* attr_list = pango_attr_list_new();
   if (char_spacing_) {
-    PangoAttribute* spacing_attr = pango_attr_letter_spacing_new(
-        static_cast<int>(char_spacing_ * PANGO_SCALE + 0.5));
+    PangoAttribute* spacing_attr =
+        pango_attr_letter_spacing_new(char_spacing_ * PANGO_SCALE);
     spacing_attr->start_index = 0;
     spacing_attr->end_index = static_cast<guint>(-1);
     pango_attr_list_change(attr_list, spacing_attr);

training/stringrenderer.h

@@ -64,9 +64,8 @@ class StringRenderer {
                             int text_length, string* font_used, Pix** pix);
 
   bool set_font(const string& desc);
-  void set_char_spacing(double char_spacing) {
-    char_spacing_ = char_spacing;
-  }
+  // Char spacing is in PIXELS!!!!.
+  void set_char_spacing(int char_spacing) { char_spacing_ = char_spacing; }
   void set_leading(int leading) {
     leading_ = leading;
   }
@@ -180,7 +179,7 @@ class StringRenderer {
   int page_width_, page_height_, h_margin_, v_margin_;
   // Text rendering properties
   double pen_color_[3];
-  double char_spacing_;
+  int char_spacing_;
   int leading_, resolution_;
   bool vertical_text_;
   bool gravity_hint_strong_;