1 files changed, 115 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/perf/micro/hash-table.c b/libs/cairo-1.16.0/perf/micro/hash-table.c
new file mode 100644
index 0000000..d162917
--- /dev/null
+++ b/libs/cairo-1.16.0/perf/micro/hash-table.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright © 2011 Andrea Canciani
+ *
+ * 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: Andrea Canciani <ranma42@gmail.com>
+ */
+
+#include "cairo-perf.h"
+
+#define ITER 1000
+#define HOLDOVERS 256
+#define LIVE_ENTRIES 257
+#define ACTIVE_FONTS (LIVE_ENTRIES - HOLDOVERS - 1)
+
+/*
+ * The original implementation of hash tables was very inefficient, as
+ * pointed out in https://bugs.freedesktop.org/show_bug.cgi?id=17399
+ *
+ * This benchmark tries to fill up the scaled_font_map hash table to
+ * show the O(n) behavior.
+ */
+
+static cairo_time_t
+do_hash_table (cairo_t *cr, int width, int height, int loops)
+{
+    /*
+     * Microsoft C Compiler complains that:
+     * error C2466: cannot allocate an array of constant size 0
+     * so we add an unused element to make it happy
+     */
+    cairo_scaled_font_t *active_fonts[ACTIVE_FONTS + 1];
+    cairo_matrix_t m;
+    int i;
+
+    cairo_matrix_init_identity (&m);
+
+    /* Touch HOLDOVERS scaled fonts to fill up the holdover list. */
+    for (i = 0; i < HOLDOVERS; i++) {
+	m.yy = m.xx * (i + 1);
+	cairo_set_font_matrix (cr, &m);
+	cairo_get_scaled_font (cr);
+    }
+
+    /*
+     * Reference some scaled fonts so that they will be kept in the
+     * scaled fonts map. We want LIVE_ENTRIES elements in the font
+     * map, but cairo keeps HOLDOVERS recently used fonts in it and we
+     * will be activating a new font in the cr context, so we just
+     * keep references to ACTIVE_FONTS fonts.
+     *
+     * Note: setting LIVE_ENTRIES == HOLDOVERS+1 means that we keep no
+     * font in active_fonts and the slowness is caused by the holdover
+     * fonts only.
+     */
+    for (i = 0; i < ACTIVE_FONTS; i++) {
+	cairo_scaled_font_t *scaled_font;
+
+	m.yy = m.xx * (i + 1);
+	cairo_set_font_matrix (cr, &m);
+
+	scaled_font = cairo_get_scaled_font (cr);
+	active_fonts[i] = cairo_scaled_font_reference (scaled_font);
+    }
+
+    cairo_perf_timer_start ();
+
+    while (loops--) {
+	m.xx += 1.0;
+
+	/* Generate ITER new scaled fonts per loop */
+	for (i = 0; i < ITER; i++) {
+	    m.yy = m.xx * (i + 1);
+	    cairo_set_font_matrix (cr, &m);
+	    cairo_get_scaled_font (cr);
+	}
+    }
+
+    cairo_perf_timer_stop ();
+
+    for (i = 0; i < ACTIVE_FONTS; i++)
+	cairo_scaled_font_destroy (active_fonts[i]);
+
+    return cairo_perf_timer_elapsed ();
+}
+
+cairo_bool_t
+hash_table_enabled (cairo_perf_t *perf)
+{
+    return cairo_perf_can_run (perf, "hash-table", NULL);
+}
+
+void
+hash_table (cairo_perf_t *perf, cairo_t *cr, int width, int height)
+{
+    cairo_perf_cover_sources_and_operators (perf, "hash-table",
+					    do_hash_table, NULL);
+}