093de4eb2c
Bug: skia:9000 Change-Id: Ia5c16ffbaeebbdd027c692c96095cfa181030d35 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/307702 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Mike Reed <reed@google.com>
234 lines
10 KiB
C++
234 lines
10 KiB
C++
/*
|
|
* Copyright 2015 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#ifndef SkPathBuilder_DEFINED
|
|
#define SkPathBuilder_DEFINED
|
|
|
|
#include "include/core/SkMatrix.h"
|
|
#include "include/core/SkPath.h"
|
|
#include "include/core/SkPathTypes.h"
|
|
#include "include/private/SkTDArray.h"
|
|
|
|
class SK_API SkPathBuilder {
|
|
public:
|
|
SkPathBuilder();
|
|
~SkPathBuilder();
|
|
|
|
SkPath snapshot(); // the builder is unchanged after returning this path
|
|
SkPath detach(); // the builder is reset to empty after returning this path
|
|
|
|
SkPathBuilder& setFillType(SkPathFillType ft) { fFillType = ft; return *this; }
|
|
SkPathBuilder& setIsVolatile(bool isVolatile) { fIsVolatile = isVolatile; return *this; }
|
|
|
|
SkPathBuilder& reset();
|
|
|
|
SkPathBuilder& moveTo(SkPoint pt);
|
|
SkPathBuilder& moveTo(SkScalar x, SkScalar y) { return this->moveTo(SkPoint::Make(x, y)); }
|
|
|
|
SkPathBuilder& lineTo(SkPoint pt);
|
|
SkPathBuilder& lineTo(SkScalar x, SkScalar y) { return this->lineTo(SkPoint::Make(x, y)); }
|
|
|
|
SkPathBuilder& quadTo(SkPoint pt1, SkPoint pt2);
|
|
SkPathBuilder& quadTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2) {
|
|
return this->quadTo(SkPoint::Make(x1, y1), SkPoint::Make(x2, y2));
|
|
}
|
|
SkPathBuilder& quadTo(const SkPoint pts[2]) { return this->quadTo(pts[0], pts[1]); }
|
|
|
|
SkPathBuilder& conicTo(SkPoint pt1, SkPoint pt2, SkScalar w);
|
|
SkPathBuilder& conicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, SkScalar w) {
|
|
return this->conicTo(SkPoint::Make(x1, y1), SkPoint::Make(x2, y2), w);
|
|
}
|
|
SkPathBuilder& conicTo(const SkPoint pts[2], SkScalar w) {
|
|
return this->conicTo(pts[0], pts[1], w);
|
|
}
|
|
|
|
SkPathBuilder& cubicTo(SkPoint pt1, SkPoint pt2, SkPoint pt3);
|
|
SkPathBuilder& cubicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, SkScalar x3, SkScalar y3) {
|
|
return this->cubicTo(SkPoint::Make(x1, y1), SkPoint::Make(x2, y2), SkPoint::Make(x3, y3));
|
|
}
|
|
SkPathBuilder& cubicTo(const SkPoint pts[3]) {
|
|
return this->cubicTo(pts[0], pts[1], pts[2]);
|
|
}
|
|
|
|
SkPathBuilder& close();
|
|
|
|
// Relative versions of segments, relative to the previous position.
|
|
|
|
SkPathBuilder& rLineTo(SkPoint pt);
|
|
SkPathBuilder& rLineTo(SkScalar x, SkScalar y) { return this->rLineTo({x, y}); }
|
|
SkPathBuilder& rQuadTo(SkPoint pt1, SkPoint pt2);
|
|
SkPathBuilder& rQuadTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2) {
|
|
return this->rQuadTo({x1, y1}, {x2, y2});
|
|
}
|
|
SkPathBuilder& rConicTo(SkPoint p1, SkPoint p2, SkScalar w);
|
|
SkPathBuilder& rConicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, SkScalar w) {
|
|
return this->rConicTo({x1, y1}, {x2, y2}, w);
|
|
}
|
|
SkPathBuilder& rCubicTo(SkPoint pt1, SkPoint pt2, SkPoint pt3);
|
|
SkPathBuilder& rCubicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, SkScalar x3, SkScalar y3) {
|
|
return this->rCubicTo({x1, y1}, {x2, y2}, {x3, y3});
|
|
}
|
|
|
|
// Arcs
|
|
|
|
/** Appends arc to the builder. Arc added is part of ellipse
|
|
bounded by oval, from startAngle through sweepAngle. Both startAngle and
|
|
sweepAngle are measured in degrees, where zero degrees is aligned with the
|
|
positive x-axis, and positive sweeps extends arc clockwise.
|
|
|
|
arcTo() adds line connecting the builder's last point to initial arc point if forceMoveTo
|
|
is false and the builder is not empty. Otherwise, added contour begins with first point
|
|
of arc. Angles greater than -360 and less than 360 are treated modulo 360.
|
|
|
|
@param oval bounds of ellipse containing arc
|
|
@param startAngleDeg starting angle of arc in degrees
|
|
@param sweepAngleDeg sweep, in degrees. Positive is clockwise; treated modulo 360
|
|
@param forceMoveTo true to start a new contour with arc
|
|
@return reference to the builder
|
|
*/
|
|
SkPathBuilder& arcTo(const SkRect& oval, SkScalar startAngleDeg, SkScalar sweepAngleDeg,
|
|
bool forceMoveTo);
|
|
|
|
/** Appends arc to SkPath, after appending line if needed. Arc is implemented by conic
|
|
weighted to describe part of circle. Arc is contained by tangent from
|
|
last SkPath point to p1, and tangent from p1 to p2. Arc
|
|
is part of circle sized to radius, positioned so it touches both tangent lines.
|
|
|
|
If last SkPath SkPoint does not start arc, arcTo() appends connecting line to SkPath.
|
|
The length of vector from p1 to p2 does not affect arc.
|
|
|
|
Arc sweep is always less than 180 degrees. If radius is zero, or if
|
|
tangents are nearly parallel, arcTo() appends line from last SkPath SkPoint to p1.
|
|
|
|
arcTo() appends at most one line and one conic.
|
|
arcTo() implements the functionality of PostScript arct and HTML Canvas arcTo.
|
|
|
|
@param p1 SkPoint common to pair of tangents
|
|
@param p2 end of second tangent
|
|
@param radius distance from arc to circle center
|
|
@return reference to SkPath
|
|
*/
|
|
SkPathBuilder& arcTo(SkPoint p1, SkPoint p2, SkScalar radius);
|
|
|
|
enum ArcSize {
|
|
kSmall_ArcSize, //!< smaller of arc pair
|
|
kLarge_ArcSize, //!< larger of arc pair
|
|
};
|
|
|
|
/** Appends arc to SkPath. Arc is implemented by one or more conic weighted to describe
|
|
part of oval with radii (r.fX, r.fY) rotated by xAxisRotate degrees. Arc curves
|
|
from last SkPath SkPoint to (xy.fX, xy.fY), choosing one of four possible routes:
|
|
clockwise or counterclockwise,
|
|
and smaller or larger.
|
|
|
|
Arc sweep is always less than 360 degrees. arcTo() appends line to xy if either
|
|
radii are zero, or if last SkPath SkPoint equals (xy.fX, xy.fY). arcTo() scales radii r to
|
|
fit last SkPath SkPoint and xy if both are greater than zero but too small to describe
|
|
an arc.
|
|
|
|
arcTo() appends up to four conic curves.
|
|
arcTo() implements the functionality of SVG arc, although SVG sweep-flag value is
|
|
opposite the integer value of sweep; SVG sweep-flag uses 1 for clockwise, while
|
|
kCW_Direction cast to int is zero.
|
|
|
|
@param r radii on axes before x-axis rotation
|
|
@param xAxisRotate x-axis rotation in degrees; positive values are clockwise
|
|
@param largeArc chooses smaller or larger arc
|
|
@param sweep chooses clockwise or counterclockwise arc
|
|
@param xy end of arc
|
|
@return reference to SkPath
|
|
*/
|
|
SkPathBuilder& arcTo(SkPoint r, SkScalar xAxisRotate, ArcSize largeArc, SkPathDirection sweep,
|
|
SkPoint xy);
|
|
|
|
/** Appends arc to the builder, as the start of new contour. Arc added is part of ellipse
|
|
bounded by oval, from startAngle through sweepAngle. Both startAngle and
|
|
sweepAngle are measured in degrees, where zero degrees is aligned with the
|
|
positive x-axis, and positive sweeps extends arc clockwise.
|
|
|
|
If sweepAngle <= -360, or sweepAngle >= 360; and startAngle modulo 90 is nearly
|
|
zero, append oval instead of arc. Otherwise, sweepAngle values are treated
|
|
modulo 360, and arc may or may not draw depending on numeric rounding.
|
|
|
|
@param oval bounds of ellipse containing arc
|
|
@param startAngleDeg starting angle of arc in degrees
|
|
@param sweepAngleDeg sweep, in degrees. Positive is clockwise; treated modulo 360
|
|
@return reference to this builder
|
|
*/
|
|
SkPathBuilder& addArc(const SkRect& oval, SkScalar startAngleDeg, SkScalar sweepAngleDeg);
|
|
|
|
// Add a new contour
|
|
|
|
SkPathBuilder& addRect(const SkRect&, SkPathDirection, unsigned startIndex);
|
|
SkPathBuilder& addOval(const SkRect&, SkPathDirection, unsigned startIndex);
|
|
SkPathBuilder& addRRect(const SkRRect&, SkPathDirection, unsigned startIndex);
|
|
|
|
SkPathBuilder& addRect(const SkRect& rect, SkPathDirection dir = SkPathDirection::kCW) {
|
|
return this->addRect(rect, dir, 0);
|
|
}
|
|
SkPathBuilder& addOval(const SkRect& rect, SkPathDirection dir = SkPathDirection::kCW) {
|
|
// legacy start index: 1
|
|
return this->addOval(rect, dir, 1);
|
|
}
|
|
SkPathBuilder& addRRect(const SkRRect& rrect, SkPathDirection dir = SkPathDirection::kCW) {
|
|
// legacy start indices: 6 (CW) and 7 (CCW)
|
|
return this->addRRect(rrect, dir, dir == SkPathDirection::kCW ? 6 : 7);
|
|
}
|
|
|
|
SkPathBuilder& addCircle(SkScalar center_x, SkScalar center_y, SkScalar radius,
|
|
SkPathDirection dir = SkPathDirection::kCW);
|
|
|
|
SkPathBuilder& addPolygon(const SkPoint pts[], int count, bool isClosed);
|
|
SkPathBuilder& addPolygon(const std::initializer_list<SkPoint>& list, bool isClosed) {
|
|
return this->addPolygon(list.begin(), SkToInt(list.size()), isClosed);
|
|
}
|
|
|
|
// Performance hint, to reserve extra storage for subsequent calls to lineTo, quadTo, etc.
|
|
|
|
void incReserve(int extraPtCount, int extraVerbCount);
|
|
void incReserve(int extraPtCount) {
|
|
this->incReserve(extraPtCount, extraPtCount);
|
|
}
|
|
|
|
private:
|
|
SkTDArray<SkPoint> fPts;
|
|
SkTDArray<uint8_t> fVerbs;
|
|
SkTDArray<SkScalar> fConicWeights;
|
|
|
|
SkPathFillType fFillType;
|
|
bool fIsVolatile;
|
|
|
|
unsigned fSegmentMask;
|
|
SkPoint fLastMovePoint;
|
|
bool fNeedsMoveVerb;
|
|
|
|
enum IsA {
|
|
kIsA_JustMoves, // we only have 0 or more moves
|
|
kIsA_MoreThanMoves, // we have verbs other than just move
|
|
kIsA_Oval, // we are 0 or more moves followed by an oval
|
|
kIsA_RRect, // we are 0 or more moves followed by a rrect
|
|
};
|
|
IsA fIsA = kIsA_JustMoves;
|
|
int fIsAStart = -1; // tracks direction iff fIsA is not unknown
|
|
bool fIsACCW = false; // tracks direction iff fIsA is not unknown
|
|
|
|
int countVerbs() const { return fVerbs.count(); }
|
|
|
|
// called right before we add a (non-move) verb
|
|
void ensureMove() {
|
|
fIsA = kIsA_MoreThanMoves;
|
|
if (fNeedsMoveVerb) {
|
|
this->moveTo(fLastMovePoint);
|
|
}
|
|
}
|
|
|
|
SkPath make(sk_sp<SkPathRef>) const;
|
|
};
|
|
|
|
#endif
|
|
|