Add new test demonstrating assertion failure in cairo_cache_lookup.

Add new test showing problems with rotated text.

1 files changed, 113 insertions, 0 deletions

diff --git a/test/text-rotate.c b/test/text-rotate.c
new file mode 100644
index 000000000..156523974
--- /dev/null
+++ b/test/text-rotate.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright © 2004 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>
+ */
+
+/* Bug history
+ *
+ * 2004-11-03 Steve Chaplin <stevech1097@yahoo.com.au>
+ *
+ *   Reported bug on mailing list:
+ *
+ *	From: Steve Chaplin <stevech1097@yahoo.com.au>
+ *	To: cairo@cairographics.org
+ *	Date: Thu, 04 Nov 2004 00:00:17 +0800
+ *	Subject: [cairo] Rotated text bug on drawable target
+ *
+ * 	The attached file draws text rotated 90 degrees first to a PNG file and
+ *	then to a drawable. The PNG file looks fine, the text on the drawable is
+ *	unreadable.
+ *
+ *	Steve
+ *
+ * 2004-11-03 Carl Worth <cworth@cworth.org>
+ *
+ *   Looks like the major problems with this bg appeared in the great
+ *   font rework between 0.1.23 and 0.2.0. And it looks like we need
+ *   to fix the regression test suite to test the xlib target (since
+ *   the bug does not show up in the png backend).
+ *
+ *   Hmm... Actually, things don't look perfect even in the PNG
+ *   output. Look at how that 'o' moves around. It's particularly off
+ *   in the case where it's rotated by PI.
+ *
+ *   And I'm still not sure about what to do for test cases with
+ *   text--a new version of freetype will change everything. We may
+ *   need to add a simple backend for stroked fonts and add a simple
+ *   builtin font to cairo for pixel-perfect tests with text.
+ */
+
+#include "cairo_test.h"
+
+#define WIDTH  100
+#define HEIGHT 100
+#define NUM_TEXT 8
+#define TEXT_SIZE 10
+
+cairo_test_t test = {
+    "text_rotate",
+    "Tests show_text under various rotations",
+    WIDTH, HEIGHT
+};
+
+/* Draw the word cairo at NUM_TEXT different angles */
+static void
+draw (cairo_t *cr, int width, int height)
+{
+    int i;
+    cairo_text_extents_t extents;
+    static char text[] = "cairo";
+
+    cairo_select_font (cr, "Bitstream Vera Sans",
+		       CAIRO_FONT_SLANT_NORMAL,
+		       CAIRO_FONT_WEIGHT_NORMAL);
+    cairo_scale_font (cr, TEXT_SIZE);
+
+    cairo_set_rgb_color (cr, 0,0,0);
+
+    cairo_translate (cr, WIDTH/2.0, HEIGHT/2.0);
+
+    cairo_text_extents (cr, text, &extents);
+  
+    for (i=0; i < 8; i++) {
+	cairo_save (cr);
+	cairo_rotate (cr, 2*M_PI*i/NUM_TEXT);
+	/* XXX: extents.height / 4.0 gets the right result here, but I
+	 * would think it should be extents.height / 2.0. Perhaps I'm
+	 * using the extents incorrectly, (really need to go write
+	 * that reference on cairo_text_extents with a good
+	 * diagram...).
+	 */
+	cairo_move_to (cr,
+		       extents.height / (2 * tan (2*M_PI/NUM_TEXT)),
+		       extents.height / 4.0);
+	cairo_show_text (cr, "cairo");
+	cairo_restore (cr);
+    }
+}
+
+int
+main (void)
+{
+    return cairo_test (&test, draw);
+}