[AD] translucent fonts

[Elias Pschernig <elias@xxxxxxxxxx>]

Maybe the attached patch is interesting, it allows to do something like
in this screenshot:

http://allefant.sourceforge.net/allegro/translucent.png

-- 
Elias Pschernig

Index: include/allegro/font.h
===================================================================
--- include/allegro/font.h	(revision 5626)
+++ include/allegro/font.h	(working copy)
@@ -41,6 +41,8 @@
    struct FONT_VTABLE *vtable;
 } FONT;
 
+AL_FUNC(int, set_font_translucency, (int t));
+
 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 5626)
+++ src/font.c	(working copy)
@@ -438,8 +438,23 @@
  */
 int allegro_404_char = '^';
 
+/* Translucent font rendering state. */
+static int _font_translucent = FALSE;
 
 
+
+/* set_font_translucency
+ *  Set translucent font rendering state.
+ */
+int set_font_translucency(int t)
+{
+    int prev = _font_translucent;
+    _font_translucent = t;
+    return prev;
+}
+
+
+
 /* font_height:
  *  (mono and color vtable entry)
  *  Returns the height, in pixels of the font.
@@ -920,9 +935,12 @@
 	    }
         }
         else {
-            if (bitmap_color_depth(g) == bitmap_color_depth(bmp)) {
-	       masked_blit(g, bmp, 0, 0, x, y + (h-g->h)/2, g->w, g->h);
+            if (_font_translucent) {
+                draw_trans_sprite(bmp, g, x, y + (h-g->h)/2);
             }
+            else if (bitmap_color_depth(g) == bitmap_color_depth(bmp)) {
+                masked_blit(g, bmp, 0, 0, x, y + (h-g->h)/2, g->w, g->h);
+            }
             else {
                int color_conv_mode;
                BITMAP *tbmp;
Index: src/fontbmp.c
===================================================================
--- src/fontbmp.c	(revision 5626)
+++ src/fontbmp.c	(working copy)
@@ -32,12 +32,7 @@
 {
    int c;
 
-   if (bitmap_color_depth(bmp) == 8) {
-      c = 255;
-   }
-   else {
-      c = makecol_depth(bitmap_color_depth(bmp), 255, 255, 0);
-   }
+   c = getpixel(bmp, 0, 0);
 
    /* look for top left corner of character */
    while ((getpixel(bmp, *x, *y) != c) ||