[test] Variation of twin that intermixes antialiasing

Check that we are substituting the right glyph depth and changing masks
appropriately.

test/Makefile.am

@@ -979,6 +979,8 @@ REFERENCE_IMAGES = \
 	twin-antialias-gray.xlib.ref.png \
 	twin-antialias-none.ref.png \
 	twin-antialias-none.xlib.ref.png \
+	twin-antialias-mixed.ref.png \
+	twin-antialias-mixed.xlib.ref.png \
 	twin-antialias-subpixel.ref.png \
 	twin-antialias-subpixel.xlib.ref.png \
 	unantialiased-shapes.quartz.ref.png \

test/Makefile.sources

@@ -218,6 +218,7 @@ test_sources = \
 	trap-clip.c					\
 	twin.c						\
 	twin-antialias-gray.c				\
+	twin-antialias-mixed.c				\
 	twin-antialias-none.c				\
 	twin-antialias-subpixel.c			\
 	unantialiased-shapes.c				\

test/twin-antialias-mixed.c

@@ -0,0 +1,97 @@
+/*
+ * Copyright 2009 Chris Wilson
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of
+ * Chris Wilson not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Chris Wilson makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL CHRIS WILSON BE LIABLE FOR ANY SPECIAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Author: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+static cairo_scaled_font_t *
+create_twin (cairo_t *cr, cairo_antialias_t antialias)
+{
+    cairo_font_options_t *options;
+
+    cairo_select_font_face (cr,
+			    "@cairo:",
+			    CAIRO_FONT_SLANT_NORMAL,
+			    CAIRO_FONT_WEIGHT_NORMAL);
+
+    options = cairo_font_options_create ();
+    cairo_font_options_set_antialias (options, antialias);
+    cairo_set_font_options (cr, options);
+    cairo_font_options_destroy (options);
+
+    return cairo_scaled_font_reference (cairo_get_scaled_font (cr));
+}
+
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_scaled_font_t *subpixel, *gray, *none;
+
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
+    cairo_set_source_rgb (cr, 0, 0, 0);
+
+    cairo_set_font_size (cr, 16);
+    subpixel = create_twin (cr, CAIRO_ANTIALIAS_SUBPIXEL);
+    gray = create_twin (cr, CAIRO_ANTIALIAS_GRAY);
+    none = create_twin (cr, CAIRO_ANTIALIAS_NONE);
+
+    cairo_move_to (cr, 4, 14);
+    cairo_set_scaled_font (cr, subpixel);
+    cairo_show_text (cr, "Is cairo's");
+    cairo_set_scaled_font (cr, gray);
+    cairo_show_text (cr, " twin");
+    cairo_set_scaled_font (cr, none);
+    cairo_show_text (cr, " giza?");
+
+    cairo_move_to (cr, 4, 34);
+    cairo_set_scaled_font (cr, gray);
+    cairo_show_text (cr, "Is cairo's");
+    cairo_set_scaled_font (cr, none);
+    cairo_show_text (cr, " twin");
+    cairo_set_scaled_font (cr, subpixel);
+    cairo_show_text (cr, " giza?");
+
+    cairo_move_to (cr, 4, 54);
+    cairo_set_scaled_font (cr, none);
+    cairo_show_text (cr, "Is cairo's");
+    cairo_set_scaled_font (cr, gray);
+    cairo_show_text (cr, " twin");
+    cairo_set_scaled_font (cr, subpixel);
+    cairo_show_text (cr, " giza?");
+
+    cairo_scaled_font_destroy (none);
+    cairo_scaled_font_destroy (gray);
+    cairo_scaled_font_destroy (subpixel);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (twin_antialias_mixed,
+	    "Tests the internal font (with intermixed antialiasing)",
+	    "twin, font", /* keywords */
+	    NULL, /* requirements */
+	    140, 60,
+	    NULL, draw)