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Unified Diff: src/effects/SkBlurImageFilter.cpp

Issue 23011012: Implement correct clipping for image filters. (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: Cleanup Created 6 years, 11 months ago
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Index: src/effects/SkBlurImageFilter.cpp
diff --git a/src/effects/SkBlurImageFilter.cpp b/src/effects/SkBlurImageFilter.cpp
index ccc7ec386631cff597223232d3d2ab34cb2be3cb..67b0511480eaff63c99272f722c2bb2951f71e3a 100644
--- a/src/effects/SkBlurImageFilter.cpp
+++ b/src/effects/SkBlurImageFilter.cpp
@@ -236,6 +236,21 @@ void SkBlurImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const
dst->outset(SkScalarMul(fSigma.width(), SkIntToScalar(3)),
SkScalarMul(fSigma.height(), SkIntToScalar(3)));
}
+
+bool SkBlurImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
+ SkIRect* dst) const {
+ SkIRect bounds = src;
+ if (getInput(0) && !getInput(0)->filterBounds(src, ctm, &bounds)) {
+ return false;
+ }
+ SkVector sigma, localSigma = SkVector::Make(fSigma.width(), fSigma.height());
+ ctm.mapVectors(&sigma, &localSigma, 1);
+ bounds.outset(SkScalarCeilToInt(SkScalarMul(sigma.x(), SkIntToScalar(3))),
+ SkScalarCeilToInt(SkScalarMul(sigma.y(), SkIntToScalar(3))));
+ *dst = bounds;
+ return true;
+}
+
bool SkBlurImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm,
SkBitmap* result, SkIPoint* offset) {
#if SK_SUPPORT_GPU

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