[AD] [patch] is_trans_font()

[Daniel Schlyder <daniel@xxxxxxxxxx>]

I'd like to propose a new font function: is_trans_font().

Use case:

if (is_trans_font(my_font))
{
    ... allegro_gl_convert_allegro_font_ex(..., GL_RGBA);
}
else
{
    ... allegro_gl_convert_allegro_font_ex(..., GL_ALPHA8);
}

What do you think?

Index: include/allegro/font.h
===================================================================
--- include/allegro/font.h	(revision 7542)
+++ include/allegro/font.h	(working copy)
@@ -43,6 +43,7 @@
 
 AL_FUNC(void, make_trans_font, (FONT *f));
 
+AL_FUNC(int, is_trans_font, (FONT *f));
 AL_FUNC(int, is_color_font, (FONT *f));
 AL_FUNC(int, is_mono_font, (FONT *f));
 AL_FUNC(int, is_compatible_font, (FONT *f1, FONT *f2));
Index: src/font.c
===================================================================
--- src/font.c	(revision 7542)
+++ src/font.c	(working copy)
@@ -1458,6 +1458,19 @@
 
 
 
+/* is_trans_font:
+ *  Returns non-zero if the font passed is a bitmapped colour font using
+ *  draw_trans_sprite to render glyphs.
+ */
+int is_trans_font(FONT *f)
+{
+   ASSERT(f);
+
+   return (f->vtable == font_vtable_trans);
+}
+
+
+
 /* is_color_font:
  *  returns non-zero if the font passed is a bitmapped colour font
  */