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Fix negative value rounding issue for nodes across an axis (#688)

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Summary:
This fix issue https://github.com/facebook/yoga/issues/683 the rounding calculation is incorrect if a node is crossing an axis and it will shrink it's width/height on layout calculation.

The following test reproduce the issue :

```
TEST(YogaTest, node_shrink_on_axis)
{
  const YGConfigRef config = YGConfigNew();
  const YGNodeRef root = YGNodeNewWithConfig(config);
  const YGNodeRef child = YGNodeNewWithConfig(config);

  YGNodeInsertChild(root, child, 0);

  YGNodeStyleSetWidth(child, 10);
  YGNodeStyleSetHeight(child, 10);
  YGNodeStyleSetPosition(root, YGEdgeLeft, -0.75f);
  YGNodeStyleSetPosition(root, YGEdgeTop, -0.75f);

  YGNodeCalculateLayout(root, YGUndefined, YGUndefined, YGDirectionLTR);

  ASSERT_FLOAT_EQ(YGNodeLayoutGetWidth(child), 10);
  ASSERT_FLOAT_EQ(YGNodeLayoutGetHeight(child), 10);

  YGNodeFreeRecursive(root);

  YGConfigFree(config);
}
```

Pull Request resolved: https://github.com/facebook/yoga/pull/688

Reviewed By: NickGerleman

Differential Revision: D13866122

Pulled By: rozele

fbshipit-source-id: 4faf8a9efc86723c303f600d730660a2e13d8a73
This commit is contained in:
Jonathan Maurice
2023-02-02 07:50:12 -08:00
committed by Facebook GitHub Bot
parent 483e399158
commit 4266409934
2 changed files with 26 additions and 7 deletions
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23
tests/YGRoundingFunctionTest.cpp
View File

@@ -80,3 +80,26 @@ TEST(YogaTest, consistent_rounding_during_repeated_layouts) {
YGConfigFree(config);
}
// Regression test for https://github.com/facebook/yoga/issues/683
TEST(YogaTest, negative_value_rounding) {
const YGConfigRef config = YGConfigNew();
const YGNodeRef root = YGNodeNewWithConfig(config);
const YGNodeRef child = YGNodeNewWithConfig(config);
YGNodeInsertChild(root, child, 0);
YGNodeStyleSetWidth(child, 10);
YGNodeStyleSetHeight(child, 10);
YGNodeStyleSetPosition(root, YGEdgeLeft, -0.75f);
YGNodeStyleSetPosition(root, YGEdgeTop, -0.75f);
YGNodeCalculateLayout(root, YGUndefined, YGUndefined, YGDirectionLTR);
ASSERT_FLOAT_EQ(YGNodeLayoutGetWidth(child), 10);
ASSERT_FLOAT_EQ(YGNodeLayoutGetHeight(child), 10);
YGNodeFreeRecursive(root);
YGConfigFree(config);
}

10
yoga/Yoga.cpp
View File

@@ -3701,16 +3701,12 @@ YOGA_EXPORT float YGRoundValueToPixelGrid(
scaledValue = scaledValue - fractial + 1.0;
} else if (forceCeil) {
// Next we check if we need to use forced rounding
scaledValue = scaledValue - fractial + 1.0;
scaledValue = ceil(scaledValue);
} else if (forceFloor) {
scaledValue = scaledValue - fractial;
scaledValue = floor(scaledValue);
} else {
// Finally we just round the value
scaledValue = scaledValue - fractial +
(!YGDoubleIsUndefined(fractial) &&
(fractial > 0.5 || YGDoubleEqual(fractial, 0.5))
? 1.0
: 0.0);
scaledValue = round(scaledValue);
}
return (YGDoubleIsUndefined(scaledValue) ||
YGDoubleIsUndefined(pointScaleFactor))