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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkStrokeRec_DEFINED
#define SkStrokeRec_DEFINED
#include "SkPaint.h"
class SkPath;
SK_BEGIN_REQUIRE_DENSE
class SkStrokeRec {
public:
enum InitStyle {
kHairline_InitStyle,
kFill_InitStyle
};
SkStrokeRec(InitStyle style);
SkStrokeRec(const SkPaint&, SkPaint::Style, SkScalar resScale = 1);
explicit SkStrokeRec(const SkPaint&, SkScalar resScale = 1);
enum Style {
kHairline_Style,
kFill_Style,
kStroke_Style,
kStrokeAndFill_Style
};
enum {
kStyleCount = kStrokeAndFill_Style + 1
};
Style getStyle() const;
SkScalar getWidth() const { return fWidth; }
SkScalar getMiter() const { return fMiterLimit; }
SkPaint::Cap getCap() const { return (SkPaint::Cap)fCap; }
SkPaint::Join getJoin() const { return (SkPaint::Join)fJoin; }
bool isHairlineStyle() const {
return kHairline_Style == this->getStyle();
}
bool isFillStyle() const {
return kFill_Style == this->getStyle();
}
void setFillStyle();
void setHairlineStyle();
/**
* Specify the strokewidth, and optionally if you want stroke + fill.
* Note, if width==0, then this request is taken to mean:
* strokeAndFill==true -> new style will be Fill
* strokeAndFill==false -> new style will be Hairline
*/
void setStrokeStyle(SkScalar width, bool strokeAndFill = false);
void setStrokeParams(SkPaint::Cap cap, SkPaint::Join join, SkScalar miterLimit) {
fCap = cap;
fJoin = join;
fMiterLimit = miterLimit;
}
SkScalar getResScale() const {
return fResScale;
}
void setResScale(SkScalar rs) {
SkASSERT(rs > 0 && SkScalarIsFinite(rs));
fResScale = rs;
}
/**
* Returns true if this specifes any thick stroking, i.e. applyToPath()
* will return true.
*/
bool needToApply() const {
Style style = this->getStyle();
return (kStroke_Style == style) || (kStrokeAndFill_Style == style);
}
/**
* Apply these stroke parameters to the src path, returning the result
* in dst.
*
* If there was no change (i.e. style == hairline or fill) this returns
* false and dst is unchanged. Otherwise returns true and the result is
* stored in dst.
*
* src and dst may be the same path.
*/
bool applyToPath(SkPath* dst, const SkPath& src) const;
/**
* Apply these stroke parameters to a paint.
*/
void applyToPaint(SkPaint* paint) const;
/**
* Gives a conservative value for the outset that should applied to a
* geometries bounds to account for any inflation due to applying this
* strokeRec to the geometry.
*/
SkScalar getInflationRadius() const;
/**
* Equivalent to:
* SkStrokeRec rec(paint, style);
* rec.getInflationRadius();
* This does not account for other effects on the paint (i.e. path
* effect).
*/
static SkScalar GetInflationRadius(const SkPaint&, SkPaint::Style);
/**
* Compare if two SkStrokeRecs have an equal effect on a path.
* Equal SkStrokeRecs produce equal paths. Equality of produced
* paths does not take the ResScale parameter into account.
*/
bool hasEqualEffect(const SkStrokeRec& other) const {
if (!this->needToApply()) {
return this->getStyle() == other.getStyle();
}
return fWidth == other.fWidth &&
fMiterLimit == other.fMiterLimit &&
fCap == other.fCap &&
fJoin == other.fJoin &&
fStrokeAndFill == other.fStrokeAndFill;
}
private:
void init(const SkPaint&, SkPaint::Style, SkScalar resScale);
SkScalar fResScale;
SkScalar fWidth;
SkScalar fMiterLimit;
// The following three members are packed together into a single u32.
// This is to avoid unnecessary padding and ensure binary equality for
// hashing (because the padded areas might contain garbage values).
//
// fCap and fJoin are larger than needed to avoid having to initialize
// any pad values
uint32_t fCap : 16; // SkPaint::Cap
uint32_t fJoin : 15; // SkPaint::Join
uint32_t fStrokeAndFill : 1; // bool
};
SK_END_REQUIRE_DENSE
#endif
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