Anti-Aliased Fonts support.

This enables Rockbox to render anti-aliased fonts using an alpha blending method.
The input font bitmaps are 4bit, i.e. 4x larger, but the metadata size stays the same.

A tool, convttf, for converting ttf fonts directly to the Rockbox fnt format is provided.
It has a useful help output, but the parameter that works best is -c1 or -c2 (2 for larger font sizes).

Flyspray: FS#8961
Author: Initial work by Jonas Hurrelmann, further work by Fred Bauer, Andrew Mahone, Teruaki Kawashima and myself.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29523 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 8 insertions, 2 deletions

diff --git a/firmware/drivers/lcd-bitmap-common.c b/firmware/drivers/lcd-bitmap-common.c
index 364fb3c..fc84fdd 100644
--- a/firmware/drivers/lcd-bitmap-common.c
+++ b/firmware/drivers/lcd-bitmap-common.c
@@ -203,9 +203,15 @@ static void LCDFN(putsxyofs)(int x, int y, int ofs, const unsigned char *str)
         }
 
         bits = font_get_bits(pf, *ucs);
-        LCDFN(mono_bitmap_part)(bits, ofs, 0, width, x + base_ofs, y,
-                width - ofs, pf->height);
 
+#if defined(MAIN_LCD) && defined(HAVE_LCD_COLOR)
+        if (pf->depth)
+            lcd_alpha_bitmap_part(bits, ofs, 0, width, x + base_ofs, y,
+                                  width - ofs, pf->height);
+        else
+#endif
+            LCDFN(mono_bitmap_part)(bits, ofs, 0, width, x + base_ofs,
+                                    y, width - ofs, pf->height);
         if (is_diac)
         {
             current_vp->drawmode = drawmode;