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+/*
+ * 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-boilerplate-scaled-font.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 artificially induce cache pressure. (This function was added
+ * for this very purpose.)
+ *
+ * 2006-06-22 Carl Worth <cworth@cworth.org>
+ *
+ * Bug was simple enough to solve by just adding a freeze/thaw pair
+ * around the scaled_font's glyph cache in
+ * _cairo_xlib_surface_show_glyphs, (I went ahead and added
+ * _cairo_sacled_font_freeze/thaw_cache functions for this).
+ */
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+ /* 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_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans",
+ CAIRO_FONT_SLANT_NORMAL,
+ CAIRO_FONT_WEIGHT_NORMAL);
+ cairo_set_font_size (cr, TEXT_SIZE);
+
+ cairo_set_source_rgb (cr, 0, 0, 0); /* black */
+
+ cairo_boilerplate_scaled_font_set_max_glyphs_cached (cairo_get_scaled_font (cr), 1);
+
+ cairo_move_to (cr, 1, TEXT_SIZE);
+ cairo_show_text (cr, "the five boxing wizards jump quickly");
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (glyph_cache_pressure,
+ "Ensure that all backends behave well under artificial glyph cache pressure",
+ "stress", /* keywords */
+ NULL, /* requirements */
+ 223, TEXT_SIZE + 4,
+ NULL, draw)