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81 lines
2.7 KiB
81 lines
2.7 KiB
4 months ago
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/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef Sk1DPathEffect_DEFINED
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#define Sk1DPathEffect_DEFINED
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#include "include/core/SkFlattenable.h"
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#include "include/core/SkPath.h"
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#include "include/core/SkPathEffect.h"
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class SkPathMeasure;
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// This class is not exported to java.
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class SK_API Sk1DPathEffect : public SkPathEffect {
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public:
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protected:
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bool onFilterPath(SkPath* dst, const SkPath& src, SkStrokeRec*, const SkRect*) const override;
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/** Called at the start of each contour, returns the initial offset
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into that contour.
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*/
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virtual SkScalar begin(SkScalar contourLength) const = 0;
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/** Called with the current distance along the path, with the current matrix
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for the point/tangent at the specified distance.
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Return the distance to travel for the next call. If return <= 0, then that
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contour is done.
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*/
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virtual SkScalar next(SkPath* dst, SkScalar dist, SkPathMeasure&) const = 0;
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private:
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// For simplicity, assume fast bounds cannot be computed
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bool computeFastBounds(SkRect*) const override { return false; }
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using INHERITED = SkPathEffect;
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};
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class SK_API SkPath1DPathEffect : public Sk1DPathEffect {
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public:
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enum Style {
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kTranslate_Style, // translate the shape to each position
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kRotate_Style, // rotate the shape about its center
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kMorph_Style, // transform each point, and turn lines into curves
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kLastEnum_Style = kMorph_Style,
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};
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/** Dash by replicating the specified path.
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@param path The path to replicate (dash)
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@param advance The space between instances of path
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@param phase distance (mod advance) along path for its initial position
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@param style how to transform path at each point (based on the current
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position and tangent)
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*/
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static sk_sp<SkPathEffect> Make(const SkPath& path, SkScalar advance, SkScalar phase, Style);
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protected:
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SkPath1DPathEffect(const SkPath& path, SkScalar advance, SkScalar phase, Style);
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void flatten(SkWriteBuffer&) const override;
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bool onFilterPath(SkPath*, const SkPath&, SkStrokeRec*, const SkRect*) const override;
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// overrides from Sk1DPathEffect
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SkScalar begin(SkScalar contourLength) const override;
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SkScalar next(SkPath*, SkScalar, SkPathMeasure&) const override;
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private:
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SK_FLATTENABLE_HOOKS(SkPath1DPathEffect)
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SkPath fPath; // copied from constructor
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SkScalar fAdvance; // copied from constructor
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SkScalar fInitialOffset; // computed from phase
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Style fStyle; // copied from constructor
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using INHERITED = Sk1DPathEffect;
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};
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#endif
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