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Commit a7b04f8f authored by Stefan Zager's avatar Stefan Zager Committed by Commit Bot
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Fix rounding of very large and very small LayoutUnits. 

Previously, LayoutUnit's between NearlyMax() and Max() would round
down, even though their fractional parts are > 0.5.  Similarly,
LayoutUnit's between Min() and NearlyMin() would round up (toward
zero), even though their fractional parts are < -0.5.

Change-Id: I824db066f6f45b58512a30ed32c1d280604bfefe
Reviewed-on: https://chromium-review.googlesource.com/592854Reviewed-by: default avatarEmil A Eklund <eae@chromium.org>
Reviewed-by: default avatarPhilip Rogers <pdr@chromium.org>
Commit-Queue: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491071}
parent b300a0cc
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Inline Side-by-side
Showing with 15 additions and 6 deletions
third_party/WebKit/LayoutTests/fast/block/float/logical-bottom-exceeds-layoutunit-max.html
View file @ a7b04f8f
<!DOCTYPE html>
<style> #float { float:left; height: 33554431px; width: 83866px; }</style>
<style> #float { float:left; height: 33554432px; width: 83866px; }</style>
<script src="../../../resources/check-layout.js"></script>
<body onload="checkLayout('#table')">
Elements should avoid floats even if they are as high as LayoutUnit::max()
<div id="float"> </div>
<table data-offset-y=33554431 id="table">
<table data-offset-y=33554432 id="table">
<td>a</td>
</table>
</body>
third_party/WebKit/LayoutTests/fast/hidpi/image-srcset-intrinsic-size-zero-expected.txt
View file @ a7b04f8f
PASS successfullyParsed is true
TEST COMPLETE
PASS imgWidth is 33554431
PASS imgWidth is 33554432
This test passes if the image is displayed with infinite dimensions.
third_party/WebKit/LayoutTests/fast/hidpi/image-srcset-intrinsic-size-zero.html
View file @ a7b04f8f
......@@ -8,7 +8,7 @@
var imgWidth;
addEventListener("load", function() {
imgWidth = document.getElementById("foo").clientWidth;
var expected = 33554431; // blink::intMaxForLayoutUnit
var expected = 33554432; // blink::intMaxForLayoutUnit
if (sessionStorage.useZoomForDsfEnabled === 'true')
expected = Math.round(expected / window.devicePixelRatio);
shouldBe('imgWidth', '' + expected);
......
third_party/WebKit/Source/platform/LayoutUnit.h
View file @ a7b04f8f
......@@ -154,8 +154,8 @@ class LayoutUnit {
return ToInt();
}
ALWAYS_INLINE int Round() const {
return ClampAdd(RawValue(), kFixedPointDenominator / 2) >>
kLayoutUnitFractionalBits;
return ToInt() + ((Fraction().RawValue() + (kFixedPointDenominator / 2)) >>
kLayoutUnitFractionalBits);
}
int Floor() const {
......
third_party/WebKit/Source/platform/LayoutUnitTest.cpp
View file @ a7b04f8f
......@@ -100,6 +100,15 @@ TEST(LayoutUnitTest, LayoutUnitRounding) {
EXPECT_EQ(1, LayoutUnit::FromFloatRound(1.49f).Round());
EXPECT_EQ(2, LayoutUnit::FromFloatRound(1.5f).Round());
EXPECT_EQ(2, LayoutUnit::FromFloatRound(1.51f).Round());
// The fractional part of LayoutUnit::Max() is 0x3f, so it should round up.
EXPECT_EQ(((std::numeric_limits<int>::max() / kFixedPointDenominator) + 1),
LayoutUnit::Max().Round());
// The fractional part of LayoutUnit::Min() is 0, so the next bigger possible
// value should round down.
LayoutUnit epsilon;
epsilon.SetRawValue(1);
EXPECT_EQ(((std::numeric_limits<int>::min() / kFixedPointDenominator)),
(LayoutUnit::Min() + epsilon).Round());
}
TEST(LayoutUnitTest, LayoutUnitSnapSizeToPixel) {
......
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