Optimize wl_fixed_t to/from double conversion functions

1 files changed, 90 insertions, 0 deletions

diff --git a/tests/fixed-test.c b/tests/fixed-test.c
new file mode 100644
index 0000000..16fa5ff
--- /dev/null
+++ b/tests/fixed-test.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ *
+ * 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 copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS 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.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+#include "../src/wayland-private.h"
+#include "test-runner.h"
+
+TEST(fixed_double_conversions)
+{
+	wl_fixed_t f;
+	double d;
+
+	d = 62.125;
+	f = wl_fixed_from_double(d);
+	fprintf(stderr, "double %lf to fixed %x\n", d, f);
+	assert(f == 0x3e20);
+
+	d = -1200.625;
+	f = wl_fixed_from_double(d);
+	fprintf(stderr, "double %lf to fixed %x\n", d, f);
+	assert(f == -0x4b0a0);
+
+	f = random();
+	d = wl_fixed_to_double(f);
+	fprintf(stderr, "fixed %x to double %lf\n", f, d);
+	assert(d == f / 256.0);
+
+	f = 0x012030;
+	d = wl_fixed_to_double(f);
+	fprintf(stderr, "fixed %x to double %lf\n", f, d);
+	assert(d == 288.1875);
+
+	f = 0x70000000;
+	d = wl_fixed_to_double(f);
+	fprintf(stderr, "fixed %x to double %lf\n", f, d);
+	assert(d == f / 256);
+
+	f = -0x012030;
+	d = wl_fixed_to_double(f);
+	fprintf(stderr, "fixed %x to double %lf\n", f, d);
+	assert(d == -288.1875);
+
+	f = 0x80000000;
+	d = wl_fixed_to_double(f);
+	fprintf(stderr, "fixed %x to double %lf\n", f, d);
+	assert(d == f / 256);
+}
+
+TEST(fixed_int_conversions)
+{
+	wl_fixed_t f;
+	int i;
+
+	i = 62;
+	f = wl_fixed_from_int(i);
+	assert(f == 62 * 256);
+
+	i = -2080;
+	f = wl_fixed_from_int(i);
+	assert(f == -2080 * 256);
+
+	f = 0x277013;
+	i = wl_fixed_to_int(f);
+	assert(i == 0x2770);
+
+	f = -0x5044;
+	i = wl_fixed_to_int(f);
+	assert(i == -0x50);
+}