Add test/glyph-cache-pressure to demonstrate xlib failure (bug 6955)

test/.gitignore

@@ -46,6 +46,7 @@ ft-text-antialias-none
 font-face-get-type
 get-and-set
 get-group-target
+glyph-cache-pressure
 gradient-alpha
 imagediff
 leaky-dash

test/Makefile.am

@@ -29,6 +29,7 @@ fill-and-stroke-alpha-add	\
 fill-rule			\
 filter-nearest-offset		\
 font-face-get-type		\
+glyph-cache-pressure		\
 get-and-set			\
 get-group-target		\
 gradient-alpha			\
@@ -189,6 +190,7 @@ fill-rule-rgb24-ref.png					\
 fill-rule-ps-argb32-ref.png				\
 filter-nearest-offset-ref.png				\
 get-group-target-ref.png				\
+glyph-cache-pressure-ref.png				\
 gradient-alpha-ref.png					\
 gradient-alpha-rgb24-ref.png				\
 leaky-dash-ref.png					\

test/glyph-cache-pressure.c

@@ -0,0 +1,89 @@
+/*
+ * 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"
+#include "cairo-scaled-font-test.h"
+
+#define TEXT_SIZE 12
+
+/* Bug history
+ *
+ * 2006-06-22  Carl Worth  <cworth@cworth.org>
+ *
+ *   This is a test case to demonstrate the following bug in the xlib backend:
+ *
+ *	Some characters aren't displayed when using xlib (cache usage missing freeze/thaw)
+ *	https://bugs.freedesktop.org/show_bug.cgi?id=6955
+ *
+ *   We replicate this bug by using the cairo_scaled_font_set_max_glyphs_per_font
+ *   function to artifically induce cache pressure. (This function was added
+ *   for this very purpose.)
+ */
+
+cairo_test_t test = {
+    "glyph-cache-pressure",
+    "Ensure that all backends behave well under artificial glyph cache pressure",
+    223, TEXT_SIZE + 4
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_font_options_t *font_options;
+
+    /* We draw in the default black, so paint white first. */
+    cairo_save (cr);
+    cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
+    cairo_paint (cr);
+    cairo_restore (cr);
+
+    cairo_scaled_font_test_set_max_glyphs_cached_per_font (1);
+
+    cairo_select_font_face (cr, "Bitstream Vera Sans",
+			    CAIRO_FONT_SLANT_NORMAL,
+			    CAIRO_FONT_WEIGHT_NORMAL);
+    cairo_set_font_size (cr, TEXT_SIZE);
+
+    font_options = cairo_font_options_create ();
+
+    cairo_font_options_set_hint_style (font_options, CAIRO_HINT_STYLE_NONE);
+    cairo_font_options_set_antialias (font_options, CAIRO_ANTIALIAS_GRAY);
+
+    cairo_set_font_options (cr, font_options);
+    cairo_font_options_destroy (font_options);
+
+    cairo_set_source_rgb (cr, 0, 0, 0); /* black */
+
+    cairo_move_to (cr, 1, TEXT_SIZE);
+    cairo_show_text (cr, "the five boxing wizards jump quickly");
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test, draw);
+}