Title: [186208] trunk
- Revision
- 186208
- Author
- [email protected]
- Date
- 2015-07-01 17:29:55 -0700 (Wed, 01 Jul 2015)
Log Message
Reduce resolution of performance.now.
https://bugs.webkit.org/show_bug.cgi?id=146531
rdar://problem/20116796
Reviewed by Simon Fraser.
Source/WebCore:
Test: http/tests/misc/webtiming-resolution.html
* page/Performance.cpp:
(WebCore::Performance::now):
Floor the time returned by performance.now to the nearest 5 microseconds.
LayoutTests:
* http/tests/misc/webtiming-resolution-expected.txt: Added.
* http/tests/misc/webtiming-resolution.html: Added.
Modified Paths
Added Paths
Diff
Modified: trunk/LayoutTests/ChangeLog (186207 => 186208)
--- trunk/LayoutTests/ChangeLog 2015-07-02 00:07:50 UTC (rev 186207)
+++ trunk/LayoutTests/ChangeLog 2015-07-02 00:29:55 UTC (rev 186208)
@@ -1,3 +1,14 @@
+2015-07-01 Alex Christensen <[email protected]>
+
+ Reduce resolution of performance.now.
+ https://bugs.webkit.org/show_bug.cgi?id=146531
+ rdar://problem/20116796
+
+ Reviewed by Simon Fraser.
+
+ * http/tests/misc/webtiming-resolution-expected.txt: Added.
+ * http/tests/misc/webtiming-resolution.html: Added.
+
2015-07-01 Myles C. Maxfield <[email protected]>
[iOS] Support bold and thin italicized system fonts
Added: trunk/LayoutTests/http/tests/misc/webtiming-resolution-expected.txt (0 => 186208)
--- trunk/LayoutTests/http/tests/misc/webtiming-resolution-expected.txt (rev 0)
+++ trunk/LayoutTests/http/tests/misc/webtiming-resolution-expected.txt 2015-07-02 00:29:55 UTC (rev 186208)
@@ -0,0 +1,7 @@
+Verifies the minimum resolution is 5 microseconds.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS ((t1 - t0) / 0.005) % 1 < 1e-10 is true
+
Added: trunk/LayoutTests/http/tests/misc/webtiming-resolution.html (0 => 186208)
--- trunk/LayoutTests/http/tests/misc/webtiming-resolution.html (rev 0)
+++ trunk/LayoutTests/http/tests/misc/webtiming-resolution.html 2015-07-02 00:29:55 UTC (rev 186208)
@@ -0,0 +1,20 @@
+<html>
+<head>
+<script src=""
+</head>
+<body>
+<p id="description"></p>
+<div id="console"></div>
+<script>
+description("Verifies the minimum resolution is 5 microseconds.");
+
+var t0 = performance.now();
+var t1 = performance.now();
+while (t0 == t1) {
+ t1 = performance.now();
+}
+shouldBe("((t1 - t0) / 0.005) % 1 < 1e-10", "true");
+
+</script>
+</body>
+</html>
Modified: trunk/Source/WebCore/ChangeLog (186207 => 186208)
--- trunk/Source/WebCore/ChangeLog 2015-07-02 00:07:50 UTC (rev 186207)
+++ trunk/Source/WebCore/ChangeLog 2015-07-02 00:29:55 UTC (rev 186208)
@@ -1,3 +1,17 @@
+2015-07-01 Alex Christensen <[email protected]>
+
+ Reduce resolution of performance.now.
+ https://bugs.webkit.org/show_bug.cgi?id=146531
+ rdar://problem/20116796
+
+ Reviewed by Simon Fraser.
+
+ Test: http/tests/misc/webtiming-resolution.html
+
+ * page/Performance.cpp:
+ (WebCore::Performance::now):
+ Floor the time returned by performance.now to the nearest 5 microseconds.
+
2015-07-01 Eric Carlson <[email protected]>
[iOS] Build fix
Modified: trunk/Source/WebCore/page/Performance.cpp (186207 => 186208)
--- trunk/Source/WebCore/page/Performance.cpp 2015-07-02 00:07:50 UTC (rev 186207)
+++ trunk/Source/WebCore/page/Performance.cpp 2015-07-02 00:29:55 UTC (rev 186208)
@@ -231,7 +231,9 @@
double Performance::now() const
{
- return 1000.0 * (WTF::monotonicallyIncreasingTime() - m_referenceTime);
+ double nowSeconds = WTF::monotonicallyIncreasingTime() - m_referenceTime;
+ const double resolutionSeconds = 0.000005;
+ return 1000.0 * floor(nowSeconds / resolutionSeconds) * resolutionSeconds;
}
} // namespace WebCore
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