Note that the XFAIL tests all need to be fixed before 1.0.

Add three new tests for testing the various antialiasing options for text rendering.

1 files changed, 82 insertions, 0 deletions

diff --git a/test/text-antialias-subpixel.c b/test/text-antialias-subpixel.c
new file mode 100644
index 000000000..c72a71285
--- /dev/null
+++ b/test/text-antialias-subpixel.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright © 2005 Red Hat, Inc.
+ *
+ * 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
+ * Red Hat, Inc. not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Red Hat, Inc. makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL RED HAT, INC. 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: Carl D. Worth <cworth@cworth.org>
+ */
+
+#include "cairo-test.h"
+
+#define WIDTH  31
+#define HEIGHT 20
+#define TEXT_SIZE 12
+
+cairo_test_t test = {
+    "text-antialias-subpixel",
+    "Tests text rendering with subpixel antialiasing",
+    WIDTH, HEIGHT
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_text_extents_t extents;
+    cairo_font_options_t *font_options;
+    static char black[] = "black", blue[] = "blue";
+
+    cairo_select_font_face (cr, "Bitstream Vera Sans",
+			    CAIRO_FONT_SLANT_NORMAL,
+			    CAIRO_FONT_WEIGHT_NORMAL);
+    cairo_set_font_size (cr, TEXT_SIZE);
+
+    /* Sub-pixel antialiasing with unhinted glyphs can be pretty ugly
+     * (bad color fringing). The reason we turn off hints here is to
+     * try to get repeatable glyph shapes on multiple systems, not for
+     * any aesthetic reason. */
+    font_options = cairo_font_options_create ();
+
+    cairo_font_options_set_hint_style (font_options, CAIRO_HINT_STYLE_NONE);
+    cairo_font_options_set_hint_metrics (font_options, CAIRO_HINT_METRICS_OFF);
+    cairo_font_options_set_antialias (font_options, CAIRO_ANTIALIAS_SUBPIXEL);
+    cairo_font_options_set_subpixel_order (font_options, CAIRO_SUBPIXEL_ORDER_RGB);
+    cairo_set_font_options (cr, font_options);
+    cairo_font_options_destroy (font_options);
+
+    cairo_set_source_rgb (cr, 0, 0, 0); /* black */
+    cairo_text_extents (cr, black, &extents);
+    cairo_move_to (cr, -extents.x_bearing, -extents.y_bearing);
+    cairo_show_text (cr, black);
+    cairo_translate (cr, 0, -extents.y_bearing + 1);
+
+    cairo_set_source_rgb (cr, 0, 0, 1); /* blue */
+    cairo_text_extents (cr, blue, &extents);
+    cairo_move_to (cr, -extents.x_bearing, -extents.y_bearing);
+    cairo_show_text (cr, blue);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test_expect_failure (&test, draw,
+	"Bugs in subpixel-antialiased text rendering");
+}