skia2/include/effects/SkCornerPathEffect.h
Michael Ludwig 4e1c1a77ad Implement computeFastBounds for PathEffects
Makes computeFastBounds not part of the public API, it's only accessible
to subclasses of SkPathEffect, GrStyle, and SkPaint. Subclasses can
invoke it other path effects using SkPathEffectPriv::ComputeFastBounds.

Changes the internal function to
  bool computeFastBounds(SkRect* bounds) const;

Subclasses of SkPathEffect must implement this, and can choose to return
false when fast bounds aren't computable.

Provides implementations of computeFastBounds() for path effects
bundled with Skia.

Bug: skia:11974
Change-Id: I545ccf99b4e669d3af9df13acfac28573306fab8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/406140
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Mike Reed <reed@google.com>
2021-05-11 17:01:59 +00:00

50 lines
1.4 KiB
C++

/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkCornerPathEffect_DEFINED
#define SkCornerPathEffect_DEFINED
#include "include/core/SkFlattenable.h"
#include "include/core/SkPathEffect.h"
/** \class SkCornerPathEffect
SkCornerPathEffect is a subclass of SkPathEffect that can turn sharp corners
into various treatments (e.g. rounded corners)
*/
class SK_API SkCornerPathEffect : public SkPathEffect {
public:
/** radius must be > 0 to have an effect. It specifies the distance from each corner
that should be "rounded".
*/
static sk_sp<SkPathEffect> Make(SkScalar radius) {
return radius > 0 ? sk_sp<SkPathEffect>(new SkCornerPathEffect(radius)) : nullptr;
}
protected:
~SkCornerPathEffect() override;
explicit SkCornerPathEffect(SkScalar radius);
void flatten(SkWriteBuffer&) const override;
bool onFilterPath(SkPath* dst, const SkPath& src, SkStrokeRec*, const SkRect*) const override;
private:
SK_FLATTENABLE_HOOKS(SkCornerPathEffect)
bool computeFastBounds(SkRect*) const override {
// Rounding sharp corners within a path produces a new path that is still contained within
// the original's bounds, so leave 'bounds' unmodified.
return true;
}
SkScalar fRadius;
using INHERITED = SkPathEffect;
};
#endif