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Expose blurSigma (#3743)

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Fixes #3741
This commit is contained in:
Adam Barth 2016-05-04 18:50:38 -07:00
parent 6a46bf2e45
commit 2fbf11a77b
1 changed files with 7 additions and 3 deletions
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10
packages/flutter/lib/src/painting/box_painter.dart
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@ -395,9 +395,13 @@ class BoxShadow {
final double spreadRadius;
/// The [blurRadius] in sigmas instead of logical pixels.
///
/// See the sigma argument to [MaskFilter.blur].
///
// See SkBlurMask::ConvertRadiusToSigma().
// https://github.com/google/skia/blob/bb5b77db51d2e149ee66db284903572a5aac09be/src/effects/SkBlurMask.cpp#L23
double get _blurSigma => blurRadius * 0.57735 + 0.5;
// <https://github.com/google/skia/blob/bb5b77db51d2e149ee66db284903572a5aac09be/src/effects/SkBlurMask.cpp#L23>
double get blurSigma => blurRadius * 0.57735 + 0.5;
/// Returns a new box shadow with its offset, blurRadius, and spreadRadius scaled by the given factor.
BoxShadow scale(double factor) {
@ -1291,7 +1295,7 @@ class _BoxDecorationPainter extends BoxPainter {
for (BoxShadow boxShadow in _decoration.boxShadow) {
final Paint paint = new Paint()
..color = boxShadow.color
..maskFilter = new MaskFilter.blur(BlurStyle.normal, boxShadow._blurSigma);
..maskFilter = new MaskFilter.blur(BlurStyle.normal, boxShadow.blurSigma);
final Rect bounds = rect.shift(boxShadow.offset).inflate(boxShadow.spreadRadius);
_paintBox(canvas, bounds, paint);
}