Add new perf test "pattern_create_radial"

This test is really just for hammering the double to fixed-point conversion
(in _cairo_fixed_from_double) that happens as doubles from API calls gets
translated into internal cairo fixed-point numbers.

perf/Makefile.am

@@ -21,6 +21,7 @@ cairo_perf_SOURCES =		\
 	stroke.c		\
 	subimage_copy.c		\
 	tessellate.c		\
+	pattern_create_radial.c \
 	text.c
 
 if CAIRO_HAS_WIN32_SURFACE

perf/cairo-perf.c

@@ -256,5 +256,6 @@ cairo_perf_case_t perf_cases[] = {
     { text,   64, 256},
     { tessellate, 100, 100},
     { subimage_copy, 16, 512},
+    { pattern_create_radial, 16, 16},
     { NULL }
 };

perf/cairo-perf.h

@@ -88,5 +88,6 @@ CAIRO_PERF_DECL (stroke);
 CAIRO_PERF_DECL (subimage_copy);
 CAIRO_PERF_DECL (tessellate);
 CAIRO_PERF_DECL (text);
+CAIRO_PERF_DECL (pattern_create_radial);
 
 #endif

perf/pattern_create_radial.c

@@ -0,0 +1,98 @@
+/*
+ * Copyright © 2006 Dan Amelang
+ *
+ * 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
+ * the authors not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. The authors make no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE AUTHORS 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.
+ *
+ * Authors: Dan Amelang <dan@amelang.net>
+ *
+ * This test was originally created to test _cairo_fixed_from_double.
+ * cairo_pattern_create_radial was selected as the entry point into
+ * cairo as it makes several calls to _cairo_fixed_from_double and
+ * presents a somewhat realistic use-case (although the RADIALS_COUNT
+ * isn't very realistic).
+ */
+#include <time.h>
+#include "cairo-perf.h"
+
+#define RADIALS_COUNT (10000)
+
+static struct
+{
+    double cx0;
+    double cy0;
+    double radius0;
+    double cx1;
+    double cy1;
+    double radius1;
+} radials[RADIALS_COUNT];
+
+static double
+generate_double_in_range (double min, double max)
+{
+    double d;
+
+    d = rand () / (double) RAND_MAX;
+    d *= max - min;
+    d += min;
+
+    return d;
+}
+
+static cairo_perf_ticks_t
+do_pattern_create_radial (cairo_t *cr, int width, int height)
+{
+    int i;
+    cairo_pattern_t *pattern;
+
+    cairo_perf_timer_start ();
+
+    for (i = 0; i < RADIALS_COUNT; i++)
+    {
+        pattern = cairo_pattern_create_radial (radials[i].cx0, radials[i].cy0,
+                                               radials[i].radius0,
+                                               radials[i].cx1, radials[i].cy1,
+                                               radials[i].radius1);
+        cairo_pattern_destroy (pattern);
+    }
+
+    cairo_perf_timer_stop ();
+
+    return cairo_perf_timer_elapsed ();
+}
+
+void
+pattern_create_radial (cairo_perf_t *perf, cairo_t *cr, int width, int height)
+{
+    int i;
+
+    srand (time (0));
+    for (i = 0; i < RADIALS_COUNT; i++)
+    {
+        radials[i].cx0 = generate_double_in_range (-50000.0, 50000.0);
+        radials[i].cy0 = generate_double_in_range (-50000.0, 50000.0);
+        radials[i].radius0 = generate_double_in_range (0.0, 1000.0);
+        radials[i].cx1 = generate_double_in_range (-50000.0, 50000.0);
+        radials[i].cy1 = generate_double_in_range (-50000.0, 50000.0);
+        radials[i].radius1 = generate_double_in_range (0.0, 1000.0);
+    }
+
+    cairo_perf_run (perf, "pattern_create_radial",
+                          do_pattern_create_radial);
+}