| /* |
| * 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 SkPath_DEFINED |
| #define SkPath_DEFINED |
| |
| #include "SkMatrix.h" |
| #include "../private/SkPathRef.h" |
| |
| class SkAutoPathBoundsUpdate; |
| class SkData; |
| class SkRRect; |
| class SkWStream; |
| |
| /** \class SkPath |
| SkPath contain geometry. SkPath may be empty, or contain one or more SkPath::Verb that |
| outline a figure. SkPath always starts with a move verb to a Cartesian |
| coordinate, and may be followed by additional verbs that add lines or curves. |
| Adding a close verb makes the geometry into a continuous loop, a closed contour. |
| SkPath may contain any number of contours, each beginning with a move verb. |
| |
| SkPath contours may contain only a move verb, or may also contain lines, |
| quadratic beziers, conics, and cubic beziers. SkPath contours may be open or |
| closed. |
| |
| When used to draw a filled area, SkPath describes whether the fill is inside or |
| outside the geometry. SkPath also describes the winding rule used to fill |
| overlapping contours. |
| |
| Internally, SkPath lazily computes metrics likes bounds and convexity. Call |
| SkPath::updateBoundsCache to make SkPath thread safe. |
| */ |
| class SK_API SkPath { |
| public: |
| |
| /** \enum SkPath::Direction |
| Direction describes whether contour is clockwise or counterclockwise. |
| When SkPath contains multiple overlapping contours, Direction together with |
| FillType determines whether overlaps are filled or form holes. |
| |
| Direction also determines how contour is measured. For instance, dashing |
| measures along SkPath to determine where to start and stop stroke; Direction |
| will change dashed results as it steps clockwise or counterclockwise. |
| |
| Closed contours like SkRect, SkRRect, circle, and oval added with |
| kCW_Direction travel clockwise; the same added with kCCW_Direction |
| travel counterclockwise. |
| */ |
| enum Direction { |
| kCW_Direction, //!< Contour travels in a clockwise direction. |
| kCCW_Direction, //!< Contour travels in a counterclockwise direction. |
| }; |
| |
| /** By default, SkPath has no SkPath::Verb, no SkPoint, and no weights. |
| SkPath::FillType is set to kWinding_FillType. |
| |
| @return empty SkPath |
| */ |
| SkPath(); |
| |
| /** Copy constructor makes two paths identical by value. Internally, path and |
| the returned result share pointer values. The underlying verb array, SkPoint arrays |
| and weights are copied when modified. |
| |
| Creating a SkPath copy is very efficient and never allocates memory. |
| SkPath are always copied by value from the interface; the underlying shared |
| pointers are not exposed. |
| |
| @param path SkPath to copy by value |
| @return copy of SkPath |
| */ |
| SkPath(const SkPath& path); |
| |
| /** Releases ownership of any shared data and deletes data if SkPath is sole owner. |
| */ |
| ~SkPath(); |
| |
| /** SkPath assignment makes two paths identical by value. Internally, assignment |
| shares pointer values. The underlying verb array, SkPoint arrays and weights |
| are copied when modified. |
| |
| Copying SkPath by assignment is very efficient and never allocates memory. |
| SkPath are always copied by value from the interface; the underlying shared |
| pointers are not exposed. |
| |
| @param path verb array, SkPoint arrays, weights, and SkPath::FillType to copy |
| @return SkPath copied by value |
| */ |
| SkPath& operator=(const SkPath& path); |
| |
| /** Compares a and b; returns true if SkPath::FillType, verb array, SkPoint arrays, and weights |
| are equivalent. |
| |
| @param a SkPath to compare |
| @param b SkPath to compare |
| @return true if SkPath pair are equivalent |
| */ |
| friend SK_API bool operator==(const SkPath& a, const SkPath& b); |
| |
| /** Compares a and b; returns true if SkPath::FillType, verb array, SkPoint arrays, and weights |
| are not equivalent. |
| |
| @param a SkPath to compare |
| @param b SkPath to compare |
| @return true if SkPath pair are not equivalent |
| */ |
| friend bool operator!=(const SkPath& a, const SkPath& b) { |
| return !(a == b); |
| } |
| |
| /** Return true if SkPath contain equal SkPath::Verb and equal weights. |
| If SkPath contain one or more conics, the weights must match. |
| |
| conicTo() may add different SkPath::Verb depending on conic weight, so it is not |
| trivial to interpolate a pair of SkPath containing conics with different |
| conic weight values. |
| |
| @param compare SkPath to compare |
| @return true if SkPath verb array and weights are equivalent |
| */ |
| bool isInterpolatable(const SkPath& compare) const; |
| |
| /** Interpolate between SkPath with equal sized point arrays. |
| Copy verb array and weights to out, |
| and set out SkPoint arrays to a weighted average of this SkPoint arrays and ending |
| SkPoint arrays, using the formula: |
| (this->points * weight) + ending->points * (1 - weight) |
| |
| weight is most useful when between zero (ending SkPoint arrays) and |
| one (this Point_Array); will work with values outside of this |
| range. |
| |
| interpolate() returns false and leaves out unchanged if SkPoint arrays is not |
| the same size as ending SkPoint arrays. Call isInterpolatable() to check SkPath |
| compatibility prior to calling interpolate(). |
| |
| @param ending SkPoint arrays averaged with this SkPoint arrays |
| @param weight contribution of ending SkPoint arrays, and |
| one minus contribution of this SkPoint arrays |
| @param out SkPath replaced by interpolated averages |
| @return true if SkPath contain same number of SkPoint |
| */ |
| bool interpolate(const SkPath& ending, SkScalar weight, SkPath* out) const; |
| |
| #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK |
| /** To be deprecated; only valid for Android framework. |
| |
| @return true if SkPath has one owner |
| */ |
| bool unique() const { return fPathRef->unique(); } |
| #endif |
| |
| /** \enum SkPath::FillType |
| FillType selects the rule used to fill SkPath. SkPath set to kWinding_FillType |
| fills if the sum of contour edges is not zero, where clockwise edges add one, and |
| counterclockwise edges subtract one. SkPath set to kEvenOdd_FillType fills if the |
| number of contour edges is odd. Each FillType has an inverse variant that |
| reverses the rule: |
| kInverseWinding_FillType fills where the sum of contour edges is zero; |
| kInverseEvenOdd_FillType fills where the number of contour edges is even. |
| */ |
| enum FillType { |
| /** Specifies fill as area is enclosed by a non-zero sum of contour Direction. */ |
| kWinding_FillType, |
| |
| /** Specifies fill as area enclosed by an odd number of contours. */ |
| kEvenOdd_FillType, |
| |
| /** Specifies fill as area is enclosed by a zero sum of contour Direction. */ |
| kInverseWinding_FillType, |
| |
| /** Specifies fill as area enclosed by an even number of contours. */ |
| kInverseEvenOdd_FillType, |
| }; |
| |
| /** Returns FillType, the rule used to fill SkPath. FillType of a new SkPath is |
| kWinding_FillType. |
| |
| @return one of: kWinding_FillType, kEvenOdd_FillType, kInverseWinding_FillType, |
| kInverseEvenOdd_FillType |
| */ |
| FillType getFillType() const { return (FillType)fFillType; } |
| |
| /** Sets FillType, the rule used to fill SkPath. While there is no check |
| that ft is legal, values outside of FillType are not supported. |
| |
| @param ft one of: kWinding_FillType, kEvenOdd_FillType, kInverseWinding_FillType, |
| kInverseEvenOdd_FillType |
| */ |
| void setFillType(FillType ft) { |
| fFillType = SkToU8(ft); |
| } |
| |
| /** Returns if FillType describes area outside SkPath geometry. The inverse fill area |
| extends indefinitely. |
| |
| @return true if FillType is kInverseWinding_FillType or kInverseEvenOdd_FillType |
| */ |
| bool isInverseFillType() const { return IsInverseFillType((FillType)fFillType); } |
| |
| /** Replace FillType with its inverse. The inverse of FillType describes the area |
| unmodified by the original FillType. |
| */ |
| void toggleInverseFillType() { |
| fFillType ^= 2; |
| } |
| |
| /** \enum SkPath::Convexity |
| SkPath is convex if it contains one contour and contour loops no more than |
| 360 degrees, and contour angles all have same Direction. Convex SkPath |
| may have better performance and require fewer resources on GPU surface. |
| |
| SkPath is concave when either at least one Direction change is clockwise and |
| another is counterclockwise, or the sum of the changes in Direction is not 360 |
| degrees. |
| |
| Initially SkPath Convexity is kUnknown_Convexity. SkPath Convexity is computed |
| if needed by destination SkSurface. |
| */ |
| enum Convexity { |
| kUnknown_Convexity, //!< Indicates Convexity has not been determined. |
| |
| /** SkPath has one contour made of a simple geometry without indentations. */ |
| kConvex_Convexity, |
| kConcave_Convexity, //!< SkPath has more than one contour, or a geometry with indentations. |
| }; |
| |
| /** Computes SkPath::Convexity if required, and returns stored value. |
| SkPath::Convexity is computed if stored value is kUnknown_Convexity, |
| or if SkPath has been altered since SkPath::Convexity was computed or set. |
| |
| @return computed or stored SkPath::Convexity |
| */ |
| Convexity getConvexity() const { |
| if (kUnknown_Convexity != fConvexity) { |
| return static_cast<Convexity>(fConvexity); |
| } else { |
| return this->internalGetConvexity(); |
| } |
| } |
| |
| /** Returns last computed SkPath::Convexity, or kUnknown_Convexity if |
| SkPath has been altered since SkPath::Convexity was computed or set. |
| |
| @return stored SkPath::Convexity |
| */ |
| Convexity getConvexityOrUnknown() const { return (Convexity)fConvexity; } |
| |
| /** Stores convexity so that it is later returned by getConvexity() or getConvexityOrUnknown(). |
| convexity may differ from getConvexity(), although setting an incorrect value may |
| cause incorrect or inefficient drawing. |
| |
| If convexity is kUnknown_Convexity: getConvexity() will |
| compute SkPath::Convexity, and getConvexityOrUnknown() will return kUnknown_Convexity. |
| |
| If convexity is kConvex_Convexity or kConcave_Convexity, getConvexity() |
| and getConvexityOrUnknown() will return convexity until the path is |
| altered. |
| |
| @param convexity one of: kUnknown_Convexity, kConvex_Convexity, or kConcave_Convexity |
| */ |
| void setConvexity(Convexity convexity); |
| |
| /** Computes SkPath::Convexity if required, and returns true if value is kConvex_Convexity. |
| If setConvexity() was called with kConvex_Convexity or kConcave_Convexity, and |
| the path has not been altered, SkPath::Convexity is not recomputed. |
| |
| @return true if SkPath::Convexity stored or computed is kConvex_Convexity |
| */ |
| bool isConvex() const { |
| return kConvex_Convexity == this->getConvexity(); |
| } |
| |
| /** Deprecated. Use setConvexity(). |
| */ |
| SK_ATTR_DEPRECATED("use setConvexity") |
| void setIsConvex(bool isConvex) { |
| this->setConvexity(isConvex ? kConvex_Convexity : kConcave_Convexity); |
| } |
| |
| /** Returns true if constructed by addCircle(), addOval(); and in some cases, |
| addRoundRect(), addRRect(). SkPath constructed with conicTo() or rConicTo() will not |
| return true though SkPath draws oval. |
| |
| rect receives bounds of oval. |
| dir receives SkPath::Direction of oval: kCW_Direction if clockwise, kCCW_Direction if |
| counterclockwise. |
| start receives start of oval: 0 for top, 1 for right, 2 for bottom, 3 for left. |
| |
| rect, dir, and start are unmodified if oval is not found. |
| |
| Triggers performance optimizations on some GPU surface implementations. |
| |
| @param rect storage for bounding SkRect of oval; may be nullptr |
| @param dir storage for SkPath::Direction; may be nullptr |
| @param start storage for start of oval; may be nullptr |
| @return true if SkPath was constructed by method that reduces to oval |
| */ |
| bool isOval(SkRect* rect, Direction* dir = nullptr, |
| unsigned* start = nullptr) const { |
| bool isCCW = false; |
| bool result = fPathRef->isOval(rect, &isCCW, start); |
| if (dir && result) { |
| *dir = isCCW ? kCCW_Direction : kCW_Direction; |
| } |
| return result; |
| } |
| |
| /** Returns true if constructed by addRoundRect(), addRRect(); and if construction |
| is not empty, not SkRect, and not oval. SkPath constructed with other calls |
| will not return true though SkPath draws SkRRect. |
| |
| rrect receives bounds of SkRRect. |
| dir receives SkPath::Direction of oval: kCW_Direction if clockwise, kCCW_Direction if |
| counterclockwise. |
| start receives start of SkRRect: 0 for top, 1 for right, 2 for bottom, 3 for left. |
| |
| rrect, dir, and start are unmodified if SkRRect is not found. |
| |
| Triggers performance optimizations on some GPU surface implementations. |
| |
| @param rrect storage for bounding SkRect of SkRRect; may be nullptr |
| @param dir storage for SkPath::Direction; may be nullptr |
| @param start storage for start of SkRRect; may be nullptr |
| @return true if SkPath contains only SkRRect |
| */ |
| bool isRRect(SkRRect* rrect, Direction* dir = nullptr, |
| unsigned* start = nullptr) const { |
| bool isCCW = false; |
| bool result = fPathRef->isRRect(rrect, &isCCW, start); |
| if (dir && result) { |
| *dir = isCCW ? kCCW_Direction : kCW_Direction; |
| } |
| return result; |
| } |
| |
| /** Sets SkPath to its initial state. |
| Removes verb array, SkPoint arrays, and weights, and sets FillType to kWinding_FillType. |
| Internal storage associated with SkPath is released. |
| */ |
| void reset(); |
| |
| /** Sets SkPath to its initial state, preserving internal storage. |
| Removes verb array, SkPoint arrays, and weights, and sets FillType to kWinding_FillType. |
| Internal storage associated with SkPath is retained. |
| |
| Use rewind() instead of reset() if SkPath storage will be reused and performance |
| is critical. |
| */ |
| void rewind(); |
| |
| /** Empty SkPath may have FillType but has no SkPoint, SkPath::Verb, or conic weight. |
| SkPath() constructs empty SkPath; reset() and (rewind) make SkPath empty. |
| |
| @return true if the path contains no SkPath::Verb array |
| */ |
| bool isEmpty() const { |
| SkDEBUGCODE(this->validate();) |
| return 0 == fPathRef->countVerbs(); |
| } |
| |
| /** Contour is closed if SkPath SkPath::Verb array was last modified by close(). When stroked, |
| closed contour draws SkPaint::Join instead of SkPaint::Cap at first and last SkPoint. |
| |
| @return true if the last contour ends with a kClose_Verb |
| */ |
| bool isLastContourClosed() const; |
| |
| /** Returns true for finite SkPoint array values between negative SK_ScalarMax and |
| positive SK_ScalarMax. Returns false for any SkPoint array value of |
| SK_ScalarInfinity, SK_ScalarNegativeInfinity, or SK_ScalarNaN. |
| |
| @return true if all SkPoint values are finite |
| */ |
| bool isFinite() const { |
| SkDEBUGCODE(this->validate();) |
| return fPathRef->isFinite(); |
| } |
| |
| /** Returns true if the path is volatile; it will not be altered or discarded |
| by the caller after it is drawn. SkPath by default have volatile set false, allowing |
| SkSurface to attach a cache of data which speeds repeated drawing. If true, SkSurface |
| may not speed repeated drawing. |
| |
| @return true if caller will alter SkPath after drawing |
| */ |
| bool isVolatile() const { |
| return SkToBool(fIsVolatile); |
| } |
| |
| /** Specify whether SkPath is volatile; whether it will be altered or discarded |
| by the caller after it is drawn. SkPath by default have volatile set false, allowing |
| SkBaseDevice to attach a cache of data which speeds repeated drawing. |
| |
| Mark temporary paths, discarded or modified after use, as volatile |
| to inform SkBaseDevice that the path need not be cached. |
| |
| Mark animating SkPath volatile to improve performance. |
| Mark unchanging SkPath non-volatile to improve repeated rendering. |
| |
| raster surface SkPath draws are affected by volatile for some shadows. |
| GPU surface SkPath draws are affected by volatile for some shadows and concave geometries. |
| |
| @param isVolatile true if caller will alter SkPath after drawing |
| */ |
| void setIsVolatile(bool isVolatile) { |
| fIsVolatile = isVolatile; |
| } |
| |
| /** Test if line between SkPoint pair is degenerate. |
| Line with no length or that moves a very short distance is degenerate; it is |
| treated as a point. |
| |
| exact changes the equality test. If true, returns true only if p1 equals p2. |
| If false, returns true if p1 equals or nearly equals p2. |
| |
| @param p1 line start point |
| @param p2 line end point |
| @param exact if false, allow nearly equals |
| @return true if line is degenerate; its length is effectively zero |
| */ |
| static bool IsLineDegenerate(const SkPoint& p1, const SkPoint& p2, bool exact) { |
| return exact ? p1 == p2 : p1.equalsWithinTolerance(p2); |
| } |
| |
| /** Test if quad is degenerate. |
| Quad with no length or that moves a very short distance is degenerate; it is |
| treated as a point. |
| |
| @param p1 quad start point |
| @param p2 quad control point |
| @param p3 quad end point |
| @param exact if true, returns true only if p1, p2, and p3 are equal; |
| if false, returns true if p1, p2, and p3 are equal or nearly equal |
| @return true if quad is degenerate; its length is effectively zero |
| */ |
| static bool IsQuadDegenerate(const SkPoint& p1, const SkPoint& p2, |
| const SkPoint& p3, bool exact) { |
| return exact ? p1 == p2 && p2 == p3 : p1.equalsWithinTolerance(p2) && |
| p2.equalsWithinTolerance(p3); |
| } |
| |
| /** Test if cubic is degenerate. |
| Cubic with no length or that moves a very short distance is degenerate; it is |
| treated as a point. |
| |
| @param p1 cubic start point |
| @param p2 cubic control point 1 |
| @param p3 cubic control point 2 |
| @param p4 cubic end point |
| @param exact if true, returns true only if p1, p2, p3, and p4 are equal; |
| if false, returns true if p1, p2, p3, and p4 are equal or nearly equal |
| @return true if cubic is degenerate; its length is effectively zero |
| */ |
| static bool IsCubicDegenerate(const SkPoint& p1, const SkPoint& p2, |
| const SkPoint& p3, const SkPoint& p4, bool exact) { |
| return exact ? p1 == p2 && p2 == p3 && p3 == p4 : p1.equalsWithinTolerance(p2) && |
| p2.equalsWithinTolerance(p3) && |
| p3.equalsWithinTolerance(p4); |
| } |
| |
| /** Returns true if SkPath contains only one line; |
| SkPath::Verb array has two entries: kMove_Verb, kLine_Verb. |
| If SkPath contains one line and line is not nullptr, line is set to |
| line start point and line end point. |
| Returns false if SkPath is not one line; line is unaltered. |
| |
| @param line storage for line. May be nullptr |
| @return true if SkPath contains exactly one line |
| */ |
| bool isLine(SkPoint line[2]) const; |
| |
| /** Returns the number of points in SkPath. |
| SkPoint count is initially zero. |
| |
| @return SkPath SkPoint array length |
| */ |
| int countPoints() const; |
| |
| /** Returns SkPoint at index in SkPoint arrays. Valid range for index is |
| 0 to countPoints() - 1. |
| Returns (0, 0) if index is out of range. |
| |
| @param index SkPoint array element selector |
| @return SkPoint array value or (0, 0) |
| */ |
| SkPoint getPoint(int index) const; |
| |
| /** Returns number of points in SkPath. Up to max points are copied. |
| points may be nullptr; then, max must be zero. |
| If max is greater than number of points, excess points storage is unaltered. |
| |
| @param points storage for SkPath SkPoint array. May be nullptr |
| @param max maximum to copy; must be greater than or equal to zero |
| @return SkPath SkPoint array length |
| */ |
| int getPoints(SkPoint points[], int max) const; |
| |
| /** Returns the number of SkPath::Verb: kMove_Verb, kLine_Verb, kQuad_Verb, kConic_Verb, |
| kCubic_Verb, and kClose_Verb; added to SkPath. |
| |
| @return length of verb array |
| */ |
| int countVerbs() const; |
| |
| /** Returns the number of verbs in the path. Up to max verbs are copied. The |
| verbs are copied as one byte per verb. |
| |
| @param verbs storage for verbs, may be nullptr |
| @param max maximum number to copy into verbs |
| @return the actual number of verbs in the path |
| */ |
| int getVerbs(uint8_t verbs[], int max) const; |
| |
| /** Exchanges the verb array, SkPoint arrays, weights, and SkPath::FillType with other. |
| Cached state is also exchanged. swap() internally exchanges pointers, so |
| it is lightweight and does not allocate memory. |
| |
| swap() usage has largely been replaced by operator=(const SkPath& path). |
| SkPath do not copy their content on assignment until they are written to, |
| making assignment as efficient as swap(). |
| |
| @param other SkPath exchanged by value |
| */ |
| void swap(SkPath& other); |
| |
| /** Returns minimum and maximum x and y values of SkPoint arrays. |
| Returns (0, 0, 0, 0) if SkPath contains no points. Returned bounds width and height may |
| be larger or smaller than area affected when SkPath is drawn. |
| |
| SkRect returned includes all SkPoint added to SkPath, including SkPoint associated with |
| kMove_Verb that define empty contours. |
| |
| @return bounds of all SkPoint in SkPoint arrays |
| */ |
| const SkRect& getBounds() const { |
| return fPathRef->getBounds(); |
| } |
| |
| /** Update internal bounds so that subsequent calls to getBounds() are instantaneous. |
| Unaltered copies of SkPath may also access cached bounds through getBounds(). |
| |
| For now, identical to calling getBounds() and ignoring the returned value. |
| |
| Call to prepare SkPath subsequently drawn from multiple threads, |
| to avoid a race condition where each draw separately computes the bounds. |
| */ |
| void updateBoundsCache() const { |
| // for now, just calling getBounds() is sufficient |
| this->getBounds(); |
| } |
| |
| /** Returns minimum and maximum x and y values of the lines and curves in SkPath. |
| Returns (0, 0, 0, 0) if SkPath contains no points. |
| Returned bounds width and height may be larger or smaller than area affected |
| when SkPath is drawn. |
| |
| Includes SkPoint associated with kMove_Verb that define empty |
| contours. |
| |
| Behaves identically to getBounds() when SkPath contains |
| only lines. If SkPath contains curves, computed bounds includes |
| the maximum extent of the quad, conic, or cubic; is slower than getBounds(); |
| and unlike getBounds(), does not cache the result. |
| |
| @return tight bounds of curves in SkPath |
| */ |
| SkRect computeTightBounds() const; |
| |
| /** Returns true if rect is contained by SkPath. |
| May return false when rect is contained by SkPath. |
| |
| For now, only returns true if SkPath has one contour and is convex. |
| rect may share points and edges with SkPath and be contained. |
| Returns true if rect is empty, that is, it has zero width or height; and |
| the SkPoint or line described by rect is contained by SkPath. |
| |
| @param rect SkRect, line, or SkPoint checked for containment |
| @return true if rect is contained |
| */ |
| bool conservativelyContainsRect(const SkRect& rect) const; |
| |
| /** grows SkPath verb array and SkPoint arrays to contain extraPtCount additional SkPoint. |
| May improve performance and use less memory by |
| reducing the number and size of allocations when creating SkPath. |
| |
| @param extraPtCount number of additional SkPoint to allocate |
| */ |
| void incReserve(unsigned extraPtCount); |
| |
| /** Adds beginning of contour at SkPoint (x, y). |
| |
| @param x x-coordinate of contour start |
| @param y y-coordinate of contour start |
| */ |
| void moveTo(SkScalar x, SkScalar y); |
| |
| /** Adds beginning of contour at SkPoint p. |
| |
| @param p contour start |
| */ |
| void moveTo(const SkPoint& p) { |
| this->moveTo(p.fX, p.fY); |
| } |
| |
| /** Adds beginning of contour relative to last point. |
| If SkPath is empty, starts contour at (dx, dy). |
| Otherwise, start contour at last point offset by (dx, dy). |
| Function name stands for "relative move to". |
| |
| @param dx offset from last point x to contour start x |
| @param dy offset from last point y to contour start y |
| */ |
| void rMoveTo(SkScalar dx, SkScalar dy); |
| |
| /** Adds line from last point to (x, y). If SkPath is empty, or last SkPath::Verb is |
| kClose_Verb, last point is set to (0, 0) before adding line. |
| |
| lineTo() appends kMove_Verb to verb array and (0, 0) to SkPoint arrays, if needed. |
| lineTo() then appends kLine_Verb to verb array and (x, y) to SkPoint arrays. |
| |
| @param x end of added line in x |
| @param y end of added line in y |
| */ |
| void lineTo(SkScalar x, SkScalar y); |
| |
| /** Adds line from last point to SkPoint p. If SkPath is empty, or last SkPath::Verb is |
| kClose_Verb, last point is set to (0, 0) before adding line. |
| |
| lineTo() first appends kMove_Verb to verb array and (0, 0) to SkPoint arrays, if needed. |
| lineTo() then appends kLine_Verb to verb array and SkPoint p to SkPoint arrays. |
| |
| @param p end SkPoint of added line |
| */ |
| void lineTo(const SkPoint& p) { |
| this->lineTo(p.fX, p.fY); |
| } |
| |
| /** Adds line from last point to SkVector (dx, dy). If SkPath is empty, or last SkPath::Verb is |
| kClose_Verb, last point is set to (0, 0) before adding line. |
| |
| Appends kMove_Verb to verb array and (0, 0) to SkPoint arrays, if needed; |
| then appends kLine_Verb to verb array and line end to SkPoint arrays. |
| Line end is last point plus SkVector (dx, dy). |
| Function name stands for "relative line to". |
| |
| @param dx offset from last point x to line end x |
| @param dy offset from last point y to line end y |
| */ |
| void rLineTo(SkScalar dx, SkScalar dy); |
| |
| /** Adds quad from last point towards (x1, y1), to (x2, y2). |
| If SkPath is empty, or last SkPath::Verb is kClose_Verb, last point is set to (0, 0) |
| before adding quad. |
| |
| Appends kMove_Verb to verb array and (0, 0) to SkPoint arrays, if needed; |
| then appends kQuad_Verb to verb array; and (x1, y1), (x2, y2) |
| to SkPoint arrays. |
| |
| @param x1 control SkPoint of quad in x |
| @param y1 control SkPoint of quad in y |
| @param x2 end SkPoint of quad in x |
| @param y2 end SkPoint of quad in y |
| */ |
| void quadTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2); |
| |
| /** Adds quad from last point towards SkPoint p1, to SkPoint p2. |
| If SkPath is empty, or last SkPath::Verb is kClose_Verb, last point is set to (0, 0) |
| before adding quad. |
| |
| Appends kMove_Verb to verb array and (0, 0) to SkPoint arrays, if needed; |
| then appends kQuad_Verb to verb array; and SkPoint p1, p2 |
| to SkPoint arrays. |
| |
| @param p1 control SkPoint of added quad |
| @param p2 end SkPoint of added quad |
| */ |
| void quadTo(const SkPoint& p1, const SkPoint& p2) { |
| this->quadTo(p1.fX, p1.fY, p2.fX, p2.fY); |
| } |
| |
| /** Adds quad from last point towards SkVector (dx1, dy1), to SkVector (dx2, dy2). |
| If SkPath is empty, or last SkPath::Verb |
| is kClose_Verb, last point is set to (0, 0) before adding quad. |
| |
| Appends kMove_Verb to verb array and (0, 0) to SkPoint arrays, |
| if needed; then appends kQuad_Verb to verb array; and appends quad |
| control and quad end to SkPoint arrays. |
| Quad control is last point plus SkVector (dx1, dy1). |
| Quad end is last point plus SkVector (dx2, dy2). |
| Function name stands for "relative quad to". |
| |
| @param dx1 offset from last point x to quad control x |
| @param dy1 offset from last point x to quad control y |
| @param dx2 offset from last point x to quad end x |
| @param dy2 offset from last point x to quad end y |
| */ |
| void rQuadTo(SkScalar dx1, SkScalar dy1, SkScalar dx2, SkScalar dy2); |
| |
| /** Adds conic from last point towards (x1, y1), to (x2, y2), weighted by w. |
| If SkPath is empty, or last SkPath::Verb is kClose_Verb, last point is set to (0, 0) |
| before adding conic. |
| |
| Appends kMove_Verb to verb array and (0, 0) to SkPoint arrays, if needed. |
| |
| If w is finite and not one, appends kConic_Verb to verb array; |
| and (x1, y1), (x2, y2) to SkPoint arrays; and w to conic weights. |
| |
| If w is one, appends kQuad_Verb to verb array, and |
| (x1, y1), (x2, y2) to SkPoint arrays. |
| |
| If w is not finite, appends kLine_Verb twice to verb array, and |
| (x1, y1), (x2, y2) to SkPoint arrays. |
| |
| @param x1 control SkPoint of conic in x |
| @param y1 control SkPoint of conic in y |
| @param x2 end SkPoint of conic in x |
| @param y2 end SkPoint of conic in y |
| @param w weight of added conic |
| */ |
| void conicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, |
| SkScalar w); |
| |
| /** Adds conic from last point towards SkPoint p1, to SkPoint p2, weighted by w. |
| If SkPath is empty, or last SkPath::Verb is kClose_Verb, last point is set to (0, 0) |
| before adding conic. |
| |
| Appends kMove_Verb to verb array and (0, 0) to SkPoint arrays, if needed. |
| |
| If w is finite and not one, appends kConic_Verb to verb array; |
| and SkPoint p1, p2 to SkPoint arrays; and w to conic weights. |
| |
| If w is one, appends kQuad_Verb to verb array, and SkPoint p1, p2 |
| to SkPoint arrays. |
| |
| If w is not finite, appends kLine_Verb twice to verb array, and |
| SkPoint p1, p2 to SkPoint arrays. |
| |
| @param p1 control SkPoint of added conic |
| @param p2 end SkPoint of added conic |
| @param w weight of added conic |
| */ |
| void conicTo(const SkPoint& p1, const SkPoint& p2, SkScalar w) { |
| this->conicTo(p1.fX, p1.fY, p2.fX, p2.fY, w); |
| } |
| |
| /** Adds conic from last point towards SkVector (dx1, dy1), to SkVector (dx2, dy2), |
| weighted by w. If SkPath is empty, or last SkPath::Verb |
| is kClose_Verb, last point is set to (0, 0) before adding conic. |
| |
| Appends kMove_Verb to verb array and (0, 0) to SkPoint arrays, |
| if needed. |
| |
| If w is finite and not one, next appends kConic_Verb to verb array, |
| and w is recorded as conic weight; otherwise, if w is one, appends |
| kQuad_Verb to verb array; or if w is not finite, appends kLine_Verb |
| twice to verb array. |
| |
| In all cases appends SkPoint control and end to SkPoint arrays. |
| control is last point plus SkVector (dx1, dy1). |
| end is last point plus SkVector (dx2, dy2). |
| |
| Function name stands for "relative conic to". |
| |
| @param dx1 offset from last point x to conic control x |
| @param dy1 offset from last point x to conic control y |
| @param dx2 offset from last point x to conic end x |
| @param dy2 offset from last point x to conic end y |
| @param w weight of added conic |
| */ |
| void rConicTo(SkScalar dx1, SkScalar dy1, SkScalar dx2, SkScalar dy2, |
| SkScalar w); |
| |
| /** Adds cubic from last point towards (x1, y1), then towards (x2, y2), ending at |
| (x3, y3). If SkPath is empty, or last SkPath::Verb is kClose_Verb, last point is set to |
| (0, 0) before adding cubic. |
| |
| Appends kMove_Verb to verb array and (0, 0) to SkPoint arrays, if needed; |
| then appends kCubic_Verb to verb array; and (x1, y1), (x2, y2), (x3, y3) |
| to SkPoint arrays. |
| |
| @param x1 first control SkPoint of cubic in x |
| @param y1 first control SkPoint of cubic in y |
| @param x2 second control SkPoint of cubic in x |
| @param y2 second control SkPoint of cubic in y |
| @param x3 end SkPoint of cubic in x |
| @param y3 end SkPoint of cubic in y |
| */ |
| void cubicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, |
| SkScalar x3, SkScalar y3); |
| |
| /** Adds cubic from last point towards SkPoint p1, then towards SkPoint p2, ending at |
| SkPoint p3. If SkPath is empty, or last SkPath::Verb is kClose_Verb, last point is set to |
| (0, 0) before adding cubic. |
| |
| Appends kMove_Verb to verb array and (0, 0) to SkPoint arrays, if needed; |
| then appends kCubic_Verb to verb array; and SkPoint p1, p2, p3 |
| to SkPoint arrays. |
| |
| @param p1 first control SkPoint of cubic |
| @param p2 second control SkPoint of cubic |
| @param p3 end SkPoint of cubic |
| */ |
| void cubicTo(const SkPoint& p1, const SkPoint& p2, const SkPoint& p3) { |
| this->cubicTo(p1.fX, p1.fY, p2.fX, p2.fY, p3.fX, p3.fY); |
| } |
| |
| /** Adds cubic from last point towards SkVector (dx1, dy1), then towards |
| SkVector (dx2, dy2), to SkVector (dx3, dy3). |
| If SkPath is empty, or last SkPath::Verb |
| is kClose_Verb, last point is set to (0, 0) before adding cubic. |
| |
| Appends kMove_Verb to verb array and (0, 0) to SkPoint arrays, |
| if needed; then appends kCubic_Verb to verb array; and appends cubic |
| control and cubic end to SkPoint arrays. |
| Cubic control is last point plus SkVector (dx1, dy1). |
| Cubic end is last point plus SkVector (dx2, dy2). |
| Function name stands for "relative cubic to". |
| |
| @param x1 offset from last point x to first cubic control x |
| @param y1 offset from last point x to first cubic control y |
| @param x2 offset from last point x to second cubic control x |
| @param y2 offset from last point x to second cubic control y |
| @param x3 offset from last point x to cubic end x |
| @param y3 offset from last point x to cubic end y |
| */ |
| void rCubicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, |
| SkScalar x3, SkScalar y3); |
| |
| /** Append arc to SkPath. 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 SkPath last SkPoint to initial arc SkPoint if forceMoveTo |
| is false and SkPath 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 startAngle starting angle of arc in degrees |
| @param sweepAngle sweep, in degrees. Positive is clockwise; treated modulo 360 |
| @param forceMoveTo true to start a new contour with arc |
| */ |
| void arcTo(const SkRect& oval, SkScalar startAngle, SkScalar sweepAngle, bool forceMoveTo); |
| |
| /** Append 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 (x0, y0) to (x1, y1), and tangent from (x1, y1) to (x2, y2). Arc |
| is part of circle sized to radius, positioned so it touches both tangent lines. |
| |
| @param x1 x common to pair of tangents |
| @param y1 y common to pair of tangents |
| @param x2 x end of second tangent |
| @param y2 y end of second tangent |
| @param radius distance from arc to circle center |
| */ |
| void arcTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, SkScalar radius); |
| |
| /** Append 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 SkVector 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 |
| */ |
| void arcTo(const SkPoint p1, const SkPoint p2, SkScalar radius) { |
| this->arcTo(p1.fX, p1.fY, p2.fX, p2.fY, radius); |
| } |
| |
| /** \enum SkPath::ArcSize |
| Four oval parts with radii (rx, ry) start at last SkPath SkPoint and ends at (x, y). |
| ArcSize and Direction select one of the four oval parts. |
| */ |
| enum ArcSize { |
| kSmall_ArcSize, //!< Smaller of arc pair. |
| kLarge_ArcSize, //!< Larger of arc pair. |
| }; |
| |
| /** Append arc to SkPath. Arc is implemented by one or more conics weighted to describe part of oval |
| with radii (rx, ry) rotated by xAxisRotate degrees. Arc curves from last SkPath SkPoint to (x, y), |
| 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 (x, y) if either radii are zero, |
| or if last SkPath SkPoint equals (x, y). arcTo() scales radii (rx, ry) to fit last SkPath SkPoint and |
| (x, y) if both are greater than zero but too small. |
| |
| 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 rx radius in x before x-axis rotation |
| @param ry radius in y 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 x end of arc |
| @param y end of arc |
| */ |
| void arcTo(SkScalar rx, SkScalar ry, SkScalar xAxisRotate, ArcSize largeArc, |
| Direction sweep, SkScalar x, SkScalar y); |
| |
| /** Append 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 (x, y). 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 in x and y 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 |
| */ |
| void arcTo(const SkPoint r, SkScalar xAxisRotate, ArcSize largeArc, Direction sweep, |
| const SkPoint xy) { |
| this->arcTo(r.fX, r.fY, xAxisRotate, largeArc, sweep, xy.fX, xy.fY); |
| } |
| |
| /** Append arc to SkPath, relative to last SkPath SkPoint. Arc is implemented by one or |
| more conic, weighted to describe part of oval with radii (rx, ry) rotated by |
| xAxisRotate degrees. Arc curves from last SkPath SkPoint (x0, y0) to end SkPoint |
| (x0 + dx, y0 + dy), choosing one of four possible routes: clockwise or |
| counterclockwise, and smaller or larger. If SkPath is empty, the start arc SkPoint |
| is (0, 0). |
| |
| Arc sweep is always less than 360 degrees. arcTo() appends line to end SkPoint |
| if either radii are zero, or if last SkPath SkPoint equals end SkPoint. |
| arcTo() scales radii (rx, ry) to fit last SkPath SkPoint and end SkPoint 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 rx radius in x before x-axis rotation |
| @param ry radius in y 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 dx x offset end of arc from last SkPath SkPoint |
| @param dy y offset end of arc from last SkPath SkPoint |
| */ |
| void rArcTo(SkScalar rx, SkScalar ry, SkScalar xAxisRotate, ArcSize largeArc, |
| Direction sweep, SkScalar dx, SkScalar dy); |
| |
| /** Append kClose_Verb to SkPath. A closed contour connects the first and last SkPoint |
| with line, forming a continuous loop. Open and closed contour draw the same |
| with SkPaint::kFill_Style. With SkPaint::kStroke_Style, open contour draws |
| SkPaint::Cap at contour start and end; closed contour draws |
| SkPaint::Join at contour start and end. |
| |
| close() has no effect if SkPath is empty or last SkPath SkPath::Verb is kClose_Verb. |
| */ |
| void close(); |
| |
| /** Returns true if fill is inverted and SkPath with fill represents area outside |
| of its geometric bounds. |
| |
| @param fill one of: kWinding_FillType, kEvenOdd_FillType, |
| kInverseWinding_FillType, kInverseEvenOdd_FillType |
| @return true if SkPath fills outside its bounds |
| */ |
| static bool IsInverseFillType(FillType fill) { |
| static_assert(0 == kWinding_FillType, "fill_type_mismatch"); |
| static_assert(1 == kEvenOdd_FillType, "fill_type_mismatch"); |
| static_assert(2 == kInverseWinding_FillType, "fill_type_mismatch"); |
| static_assert(3 == kInverseEvenOdd_FillType, "fill_type_mismatch"); |
| return (fill & 2) != 0; |
| } |
| |
| /** Returns equivalent SkPath::FillType representing SkPath fill inside its bounds. |
| . |
| |
| @param fill one of: kWinding_FillType, kEvenOdd_FillType, |
| kInverseWinding_FillType, kInverseEvenOdd_FillType |
| @return fill, or kWinding_FillType or kEvenOdd_FillType if fill is inverted |
| */ |
| static FillType ConvertToNonInverseFillType(FillType fill) { |
| static_assert(0 == kWinding_FillType, "fill_type_mismatch"); |
| static_assert(1 == kEvenOdd_FillType, "fill_type_mismatch"); |
| static_assert(2 == kInverseWinding_FillType, "fill_type_mismatch"); |
| static_assert(3 == kInverseEvenOdd_FillType, "fill_type_mismatch"); |
| return (FillType)(fill & 1); |
| } |
| |
| /** Approximates conic with quad array. Conic is constructed from start SkPoint p0, |
| control SkPoint p1, end SkPoint p2, and weight w. |
| Quad array is stored in pts; this storage is supplied by caller. |
| Maximum quad count is 2 to the pow2. |
| Every third point in array shares last SkPoint of previous quad and first SkPoint of |
| next quad. Maximum pts storage size is given by: |
| (1 + 2 * (1 << pow2)) * sizeof(SkPoint) |
| |
| ConvertConicToQuads returns quad count used the approximation, which may be smaller |
| than the number requested. |
| |
| conic weight determines the amount of influence conic control point has on the curve. |
| w less than one represents an elliptical section. w greater than one represents |
| a hyperbolic section. w equal to one represents a parabolic section. |
| |
| Two quad curves are sufficient to approximate an elliptical conic with a sweep |
| of up to 90 degrees; in this case, set pow2 to one. |
| |
| @param p0 conic start SkPoint |
| @param p1 conic control SkPoint |
| @param p2 conic end SkPoint |
| @param w conic weight |
| @param pts storage for quad array |
| @param pow2 quad count, as power of two, normally 0 to 5 (1 to 32 quad curves) |
| @return number of quad curves written to pts |
| */ |
| static int ConvertConicToQuads(const SkPoint& p0, const SkPoint& p1, const SkPoint& p2, |
| SkScalar w, SkPoint pts[], int pow2); |
| |
| /** Returns true if SkPath is equivalent to SkRect when filled. |
| If false: rect, isClosed, and direction are unchanged. |
| If true: rect, isClosed, and direction are written to if not nullptr. |
| |
| rect may be smaller than the SkPath bounds. SkPath bounds may include kMove_Verb points |
| that do not alter the area drawn by the returned rect. |
| |
| @param rect storage for bounds of SkRect; may be nullptr |
| @param isClosed storage set to true if SkPath is closed; may be nullptr |
| @param direction storage set to SkRect direction; may be nullptr |
| @return true if SkPath contains SkRect |
| */ |
| bool isRect(SkRect* rect, bool* isClosed = nullptr, Direction* direction = nullptr) const; |
| |
| /** Returns true if SkPath is equivalent to nested SkRect pair when filled. |
| If false, rect and dirs are unchanged. |
| If true, rect and dirs are written to if not nullptr: |
| setting rect[0] to outer SkRect, and rect[1] to inner SkRect; |
| setting dirs[0] to SkPath::Direction of outer SkRect, and dirs[1] to SkPath::Direction of inner |
| SkRect. |
| |
| @param rect storage for SkRect pair; may be nullptr |
| @param dirs storage for SkPath::Direction pair; may be nullptr |
| @return true if SkPath contains nested SkRect pair |
| */ |
| bool isNestedFillRects(SkRect rect[2], Direction dirs[2] = nullptr) const; |
| |
| /** Add SkRect to SkPath, appending kMove_Verb, three kLine_Verb, and kClose_Verb, |
| starting with top-left corner of SkRect; followed by top-right, bottom-right, |
| and bottom-left if dir is kCW_Direction; or followed by bottom-left, |
| bottom-right, and top-right if dir is kCCW_Direction. |
| |
| @param rect SkRect to add as a closed contour |
| @param dir SkPath::Direction to wind added contour |
| */ |
| void addRect(const SkRect& rect, Direction dir = kCW_Direction); |
| |
| /** Add SkRect to SkPath, appending kMove_Verb, three kLine_Verb, and kClose_Verb. |
| If dir is kCW_Direction, SkRect corners are added clockwise; if dir is |
| kCCW_Direction, SkRect corners are added counterclockwise. |
| start determines the first corner added. |
| |
| @param rect SkRect to add as a closed contour |
| @param dir SkPath::Direction to wind added contour |
| @param start initial corner of SkRect to add |
| */ |
| void addRect(const SkRect& rect, Direction dir, unsigned start); |
| |
| /** Add SkRect (left, top, right, bottom) to SkPath, |
| appending kMove_Verb, three kLine_Verb, and kClose_Verb, |
| starting with top-left corner of SkRect; followed by top-right, bottom-right, |
| and bottom-left if dir is kCW_Direction; or followed by bottom-left, |
| bottom-right, and top-right if dir is kCCW_Direction. |
| |
| @param left smaller x of SkRect |
| @param top smaller y of SkRect |
| @param right larger x of SkRect |
| @param bottom larger y of SkRect |
| @param dir SkPath::Direction to wind added contour |
| */ |
| void addRect(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom, |
| Direction dir = kCW_Direction); |
| |
| /** Add oval to path, appending kMove_Verb, four kConic_Verb, and kClose_Verb. |
| Oval is upright ellipse bounded by SkRect oval with radii equal to half oval width |
| and half oval height. Oval begins at (oval.fRight, oval.centerY()) and continues |
| clockwise if dir is kCW_Direction, counterclockwise if dir is kCCW_Direction. |
| |
| This form is identical to addOval(oval, dir, 1). |
| |
| @param oval bounds of ellipse added |
| @param dir SkPath::Direction to wind ellipse |
| */ |
| void addOval(const SkRect& oval, Direction dir = kCW_Direction); |
| |
| /** Add oval to SkPath, appending kMove_Verb, four kConic_Verb, and kClose_Verb. |
| Oval is upright ellipse bounded by SkRect oval with radii equal to half oval width |
| and half oval height. Oval begins at start and continues |
| clockwise if dir is kCW_Direction, counterclockwise if dir is kCCW_Direction. |
| |
| @param oval bounds of ellipse added |
| @param dir SkPath::Direction to wind ellipse |
| @param start index of initial point of ellipse |
| */ |
| void addOval(const SkRect& oval, Direction dir, unsigned start); |
| |
| /** Add circle centered at (x, y) of size radius to SkPath, appending kMove_Verb, |
| four kConic_Verb, and kClose_Verb. Circle begins at |
| (x + radius, y), continuing clockwise if dir is kCW_Direction, and counterclockwise if dir is |
| kCCW_Direction. |
| |
| Has no effect if radius is zero or negative. |
| |
| @param x center of circle |
| @param y center of circle |
| @param radius distance from center to edge |
| @param dir SkPath::Direction to wind circle |
| */ |
| void addCircle(SkScalar x, SkScalar y, SkScalar radius, |
| Direction dir = kCW_Direction); |
| |
| /** Append arc to SkPath, 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 startAngle starting angle of arc in degrees |
| @param sweepAngle sweep, in degrees. Positive is clockwise; treated modulo 360 |
| */ |
| void addArc(const SkRect& oval, SkScalar startAngle, SkScalar sweepAngle); |
| |
| /** Append SkRRect to SkPath, creating a new closed contour. SkRRect has bounds |
| equal to rect; each corner is 90 degrees of an ellipse with radii (rx, ry). If |
| dir is kCW_Direction, SkRRect starts at top-left of the lower-left corner and |
| winds clockwise. If dir is kCCW_Direction, SkRRect starts at the bottom-left |
| of the upper-left corner and winds counterclockwise. |
| |
| If either rx or ry is too large, rx and ry are scaled uniformly until the |
| corners fit. If rx or ry is less than or equal to zero, addRoundRect() appends |
| SkRect rect to SkPath. |
| |
| After appending, SkPath may be empty, or may contain: SkRect, oval, or RoundRect. |
| |
| @param rect bounds of SkRRect |
| @param rx x-radius of rounded corners on the SkRRect |
| @param ry y-radius of rounded corners on the SkRRect |
| @param dir SkPath::Direction to wind SkRRect |
| */ |
| void addRoundRect(const SkRect& rect, SkScalar rx, SkScalar ry, |
| Direction dir = kCW_Direction); |
| |
| /** Append SkRRect to SkPath, creating a new closed contour. SkRRect has bounds |
| equal to rect; each corner is 90 degrees of an ellipse with radii from the |
| array. |
| |
| @param rect bounds of SkRRect |
| @param radii array of 8 SkScalar values, a radius pair for each corner |
| @param dir SkPath::Direction to wind SkRRect |
| */ |
| void addRoundRect(const SkRect& rect, const SkScalar radii[], |
| Direction dir = kCW_Direction); |
| |
| /** Add rrect to SkPath, creating a new closed contour. If |
| dir is kCW_Direction, rrect starts at top-left of the lower-left corner and |
| winds clockwise. If dir is kCCW_Direction, rrect starts at the bottom-left |
| of the upper-left corner and winds counterclockwise. |
| |
| After appending, SkPath may be empty, or may contain: SkRect, oval, or SkRRect. |
| |
| @param rrect bounds and radii of rounded rectangle |
| @param dir SkPath::Direction to wind SkRRect |
| */ |
| void addRRect(const SkRRect& rrect, Direction dir = kCW_Direction); |
| |
| /** Add rrect to SkPath, creating a new closed contour. If dir is kCW_Direction, rrect |
| winds clockwise; if dir is kCCW_Direction, rrect winds counterclockwise. |
| start determines the first point of rrect to add. |
| |
| @param rrect bounds and radii of rounded rectangle |
| @param dir SkPath::Direction to wind SkRRect |
| @param start index of initial point of SkRRect |
| */ |
| void addRRect(const SkRRect& rrect, Direction dir, unsigned start); |
| |
| /** Add contour created from line array, adding (count - 1) line segments. |
| Contour added starts at pts[0], then adds a line for every additional SkPoint |
| in pts array. If close is true,appends kClose_Verb to SkPath, connecting |
| pts[count - 1] and pts[0]. |
| |
| If count is zero, append kMove_Verb to path. |
| Has no effect if count is less than one. |
| |
| @param pts array of line sharing end and start SkPoint |
| @param count length of SkPoint array |
| @param close true to add line connecting contour end and start |
| */ |
| void addPoly(const SkPoint pts[], int count, bool close); |
| |
| /** \enum SkPath::AddPathMode |
| AddPathMode chooses how addPath() appends. Adding one SkPath to another can extend |
| the last contour or start a new contour. |
| */ |
| enum AddPathMode { |
| /** Since SkPath verb array begins with kMove_Verb if src is not empty, this |
| starts a new contour. |
| */ |
| kAppend_AddPathMode, |
| |
| /** is not empty, add line from last point to added SkPath first SkPoint. Skip added |
| SkPath initial kMove_Verb, then append remining Verb, SkPoint, and conic weights. |
| */ |
| kExtend_AddPathMode, |
| }; |
| |
| /** Append src to SkPath, offset by (dx, dy). |
| |
| If mode is kAppend_AddPathMode, src verb array, SkPoint arrays, and conic weights are |
| added unaltered. If mode is kExtend_AddPathMode, add line before appending |
| SkPath::Verb, SkPoint, and conic weights. |
| |
| @param src SkPath SkPath::Verb, SkPoint, and conic weights to add |
| @param dx offset added to src SkPoint arrays x coordinates |
| @param dy offset added to src SkPoint arrays y coordinates |
| @param mode kAppend_AddPathMode or kExtend_AddPathMode |
| */ |
| void addPath(const SkPath& src, SkScalar dx, SkScalar dy, |
| AddPathMode mode = kAppend_AddPathMode); |
| |
| /** Append src to SkPath. |
| |
| If mode is kAppend_AddPathMode, src verb array, SkPoint arrays, and conic weights are |
| added unaltered. If mode is kExtend_AddPathMode, add line before appending |
| SkPath::Verb, SkPoint, and conic weights. |
| |
| @param src SkPath SkPath::Verb, SkPoint, and conic weights to add |
| @param mode kAppend_AddPathMode or kExtend_AddPathMode |
| */ |
| void addPath(const SkPath& src, AddPathMode mode = kAppend_AddPathMode) { |
| SkMatrix m; |
| m.reset(); |
| this->addPath(src, m, mode); |
| } |
| |
| /** Append src to SkPath, transformed by matrix. Transformed curves may have different |
| SkPath::Verb, SkPoint, and conic weights. |
| |
| If mode is kAppend_AddPathMode, src verb array, SkPoint arrays, and conic weights are |
| added unaltered. If mode is kExtend_AddPathMode, add line before appending |
| SkPath::Verb, SkPoint, and conic weights. |
| |
| @param src SkPath SkPath::Verb, SkPoint, and conic weights to add |
| @param matrix transform applied to src |
| @param mode kAppend_AddPathMode or kExtend_AddPathMode |
| */ |
| void addPath(const SkPath& src, const SkMatrix& matrix, AddPathMode mode = kAppend_AddPathMode); |
| |
| /** Append src to SkPath, from back to front. |
| Reversed src always appends a new contour to SkPath. |
| |
| @param src SkPath SkPath::Verb, SkPoint, and conic weights to add |
| */ |
| void reverseAddPath(const SkPath& src); |
| |
| /** Offset SkPoint arrays by (dx, dy). Offset SkPath replaces dst. |
| If dst is nullptr, SkPath is replaced by offset data. |
| |
| @param dx offset added to SkPoint arrays x coordinates |
| @param dy offset added to SkPoint arrays y coordinates |
| @param dst overwritten, translated copy of SkPath; may be nullptr |
| */ |
| void offset(SkScalar dx, SkScalar dy, SkPath* dst) const; |
| |
| /** Offset SkPoint arrays by (dx, dy). SkPath is replaced by offset data. |
| |
| @param dx offset added to SkPoint arrays x coordinates |
| @param dy offset added to SkPoint arrays y coordinates |
| */ |
| void offset(SkScalar dx, SkScalar dy) { |
| this->offset(dx, dy, this); |
| } |
| |
| /** Transform verb array, SkPoint arrays, and weight by matrix. |
| transform may change SkPath::Verb and increase their number. |
| Transformed SkPath replaces dst; if dst is nullptr, original data |
| is replaced. |
| |
| @param matrix SkMatrix to apply to SkPath |
| @param dst overwritten, transformed copy of SkPath; may be nullptr |
| */ |
| void transform(const SkMatrix& matrix, SkPath* dst) const; |
| |
| /** Transform verb array, SkPoint arrays, and weight by matrix. |
| transform may change SkPath::Verb and increase their number. |
| SkPath is replaced by transformed data. |
| |
| @param matrix SkMatrix to apply to SkPath |
| */ |
| void transform(const SkMatrix& matrix) { |
| this->transform(matrix, this); |
| } |
| |
| /** Returns last point on SkPath in lastPt. Returns false if SkPoint arrays is empty, |
| storing (0, 0) if lastPt is not nullptr. |
| |
| @param lastPt storage for final SkPoint in SkPoint arrays; may be nullptr |
| @return true if SkPoint arrays contains one or more SkPoint |
| */ |
| bool getLastPt(SkPoint* lastPt) const; |
| |
| /** Set last point to (x, y). If SkPoint arrays is empty, append kMove_Verb to |
| verb array and (x, y) to SkPoint arrays. |
| |
| @param x set x-coordinate of last point |
| @param y set y-coordinate of last point |
| */ |
| void setLastPt(SkScalar x, SkScalar y); |
| |
| /** Set the last point on the path. If no points have been added, moveTo(p) |
| is automatically called. |
| |
| @param p set value of last point |
| */ |
| void setLastPt(const SkPoint& p) { |
| this->setLastPt(p.fX, p.fY); |
| } |
| |
| /** \enum SkPath::SegmentMask |
| SegmentMask constants correspond to each drawing Verb type in SkPath; for |
| instance, if SkPath only contains lines, only the kLine_SegmentMask bit is set. |
| */ |
| enum SegmentMask { |
| kLine_SegmentMask = 1 << 0, //!< Set if verb array contains kLine_Verb. |
| |
| /** Set if verb array contains kQuad_Verb. Note that conicTo() may add a quad. */ |
| kQuad_SegmentMask = 1 << 1, |
| kConic_SegmentMask = 1 << 2, //!< Set if verb array contains kConic_Verb. |
| kCubic_SegmentMask = 1 << 3, //!< Set if verb array contains kCubic_Verb. |
| }; |
| |
| /** Returns a mask, where each set bit corresponds to a SegmentMask constant |
| if SkPath contains one or more SkPath::Verb of that type. |
| Returns zero if SkPath contains no lines, or curves: quads, conics, or cubics. |
| |
| getSegmentMasks() returns a cached result; it is very fast. |
| |
| @return SegmentMask bits or zero |
| */ |
| uint32_t getSegmentMasks() const { return fPathRef->getSegmentMasks(); } |
| |
| /** \enum SkPath::Verb |
| Verb instructs SkPath how to interpret one or more SkPoint and optional conic weight; |
| manage contour, and terminate SkPath. |
| */ |
| enum Verb { |
| kMove_Verb, //!< Starts new contour at next SkPoint. |
| |
| /** Adds line from last point to next SkPoint. |
| Line is a straight segment from SkPoint to SkPoint. |
| */ |
| kLine_Verb, |
| |
| /** Adds quad from last point, using control SkPoint, and end SkPoint. |
| Quad is a parabolic section within tangents from last point to control SkPoint, |
| and control SkPoint to end SkPoint. |
| */ |
| kQuad_Verb, |
| |
| /** Adds conic from last point, using control SkPoint, end SkPoint, and conic weight. |
| Conic is a elliptical, parabolic, or hyperbolic section within tangents |
| from last point to control SkPoint, and control SkPoint to end SkPoint, constrained |
| by conic weight. conic weight less than one is elliptical; equal to one is |
| parabolic (and identical to Quad); greater than one hyperbolic. |
| */ |
| kConic_Verb, |
| |
| /** Adds cubic from last point, using two control SkPoint, and end SkPoint. |
| Cubic is a third-order Bezier section within tangents from last point to |
| first control SkPoint, and from second control SkPoint to end SkPoint. |
| */ |
| kCubic_Verb, |
| kClose_Verb, //!< Closes contour, connecting last point to kMove_Verb SkPoint. |
| kDone_Verb, //!< Terminates SkPath. Not in verb array, but returned by SkPath iterator. |
| }; |
| |
| /** \class SkPath::Iter |
| Iterates through verb array, and associated SkPoint arrays and conic weight. |
| Provides options to treat open contours as closed, and to ignore |
| degenerate data. |
| */ |
| class SK_API Iter { |
| |
| public: |
| |
| /** Initializes iter with an empty SkPath. next() on iter returns kDone_Verb. |
| Call setPath to initialize iter at a later time. |
| |
| @return iter of empty SkPath |
| */ |
| Iter(); |
| |
| /** Sets iter to return elements of verb array, SkPoint arrays, and conic weight in path. |
| If forceClose is true, iter will add kLine_Verb and kClose_Verb after each |
| open contour. path is not altered. |
| |
| @param path SkPath to iterate |
| @param forceClose true if open contours generate kClose_Verb |
| @return iter of path |
| */ |
| Iter(const SkPath& path, bool forceClose); |
| |
| /** Sets iter to return elements of verb array, SkPoint arrays, and conic weight in path. |
| If forceClose is true, iter will add kLine_Verb and kClose_Verb after each |
| open contour. path is not altered. |
| |
| @param path SkPath to iterate |
| @param forceClose true if open contours generate kClose_Verb |
| */ |
| void setPath(const SkPath& path, bool forceClose); |
| |
| /** Returns next SkPath::Verb in verb array, and advances iter. |
| When verb array is exhausted, returns kDone_Verb. |
| |
| Zero to four points are stored in pts, depending on the returned SkPath::Verb. |
| |
| If doConsumeDegenerates is true, skip consecutive kMove_Verb entries, returning |
| only the last in the series; and skip very small lines, quads, and conics; and |
| skip kClose_Verb following kMove_Verb. |
| if doConsumeDegenerates is true and exact is true, only skip lines, quads, and |
| conics with zero lengths. |
| |
| @param pts storage for SkPoint data describing returned SkPath::Verb |
| @param doConsumeDegenerates if true, skip degenerate verbs |
| @param exact skip zero length curves |
| @return next SkPath::Verb from verb array |
| */ |
| Verb next(SkPoint pts[4], bool doConsumeDegenerates = true, bool exact = false) { |
| if (doConsumeDegenerates) { |
| this->consumeDegenerateSegments(exact); |
| } |
| return this->doNext(pts); |
| } |
| |
| /** Returns conic weight if next() returned kConic_Verb. |
| |
| If next() has not been called, or next() did not return kConic_Verb, |
| result is undefined. |
| |
| @return conic weight for conic points returned by next() |
| */ |
| SkScalar conicWeight() const { return *fConicWeights; } |
| |
| /** Returns true if last kLine_Verb returned by next() was generated |
| by kClose_Verb. When true, the end point returned by next() is |
| also the start point of contour. |
| |
| If next() has not been called, or next() did not return kLine_Verb, |
| result is undefined. |
| |
| @return true if last kLine_Verb was generated by kClose_Verb |
| */ |
| bool isCloseLine() const { return SkToBool(fCloseLine); } |
| |
| /** Returns true if subsequent calls to next() return kClose_Verb before returning |
| kMove_Verb. if true, contour iter is processing may end with kClose_Verb, or |
| iter may have been initialized with force close set to true. |
| |
| @return true if contour is closed |
| */ |
| bool isClosedContour() const; |
| |
| private: |
| const SkPoint* fPts; |
| const uint8_t* fVerbs; |
| const uint8_t* fVerbStop; |
| const SkScalar* fConicWeights; |
| SkPoint fMoveTo; |
| SkPoint fLastPt; |
| SkBool8 fForceClose; |
| SkBool8 fNeedClose; |
| SkBool8 fCloseLine; |
| SkBool8 fSegmentState; |
| |
| inline const SkPoint& cons_moveTo(); |
| Verb autoClose(SkPoint pts[2]); |
| void consumeDegenerateSegments(bool exact); |
| Verb doNext(SkPoint pts[4]); |
| |
| }; |
| |
| /** \class SkPath::RawIter |
| Iterates through verb array, and associated SkPoint arrays and conic weight. |
| verb array, SkPoint arrays, and conic weight are returned unaltered. |
| */ |
| class SK_API RawIter { |
| |
| public: |
| |
| /** Initializes RawIter with an empty SkPath. next() on RawIter returns kDone_Verb. |
| Call setPath to initialize iter at a later time. |
| |
| @return RawIter of empty SkPath |
| */ |
| RawIter() {} |
| |
| /** Sets RawIter to return elements of verb array, SkPoint arrays, and conic weight in path. |
| |
| @param path SkPath to iterate |
| @return RawIter of path |
| */ |
| RawIter(const SkPath& path) { |
| setPath(path); |
| } |
| |
| /** Sets iter to return elements of verb array, SkPoint arrays, and conic weight in path. |
| |
| @param path SkPath to iterate |
| */ |
| void setPath(const SkPath& path) { |
| fRawIter.setPathRef(*path.fPathRef.get()); |
| } |
| |
| /** Returns next SkPath::Verb in verb array, and advances RawIter. |
| When verb array is exhausted, returns kDone_Verb. |
| Zero to four points are stored in pts, depending on the returned SkPath::Verb. |
| |
| @param pts storage for SkPoint data describing returned SkPath::Verb |
| @return next SkPath::Verb from verb array |
| */ |
| Verb next(SkPoint pts[4]) { |
| return (Verb) fRawIter.next(pts); |
| } |
| |
| /** Returns next SkPath::Verb, but does not advance RawIter. |
| |
| @return next SkPath::Verb from verb array |
| */ |
| Verb peek() const { |
| return (Verb) fRawIter.peek(); |
| } |
| |
| /** Returns conic weight if next() returned kConic_Verb. |
| |
| If next() has not been called, or next() did not return kConic_Verb, |
| result is undefined. |
| |
| @return conic weight for conic points returned by next() |
| */ |
| SkScalar conicWeight() const { |
| return fRawIter.conicWeight(); |
| } |
| |
| private: |
| SkPathRef::Iter fRawIter; |
| friend class SkPath; |
| |
| }; |
| |
| /** Returns true if the point (x, y) is contained by SkPath, taking into |
| account FillType. |
| |
| @param x x-coordinate of containment test |
| @param y y-coordinate of containment test |
| @return true if SkPoint is in SkPath |
| */ |
| bool contains(SkScalar x, SkScalar y) const; |
| |
| /** Writes text representation of SkPath to stream. If stream is nullptr, dump() writes to |
| standard output. Set forceClose to true to get |
| edges used to fill SkPath. Set dumpAsHex true to get exact binary representations |
| of floating point numbers used in SkPoint arrays and conic weights. |
| |
| @param stream writable SkFlattenable receiving SkPath text representation; may be nullptr |
| @param forceClose true if missing kClose_Verb is output |
| @param dumpAsHex true if SkScalar values are written as hexadecimal |
| */ |
| void dump(SkWStream* stream, bool forceClose, bool dumpAsHex) const; |
| |
| /** Writes text representation of SkPath to standard output. The representation may be |
| directly compiled as C++ code. Floating point values are written |
| with limited precision; it may not be possible to reconstruct original SkPath |
| from output. |
| */ |
| void dump() const; |
| |
| /** Writes text representation of SkPath to standard output. The representation may be |
| directly compiled as C++ code. Floating point values are written |
| in hexadecimal to preserve their exact bit pattern. The output reconstructs the |
| original SkPath. |
| |
| Use instead of dump() when submitting |
| */ |
| void dumpHex() const; |
| |
| /** Writes SkPath to buffer, returning the number of bytes written. |
| Pass nullptr to obtain the storage size. |
| |
| Writes SkPath::FillType, verb array, SkPoint arrays, conic weight, and |
| additionally writes computed information like SkPath::Convexity and bounds. |
| |
| Use only be used in concert with readFromMemory(); |
| the format used for SkPath in memory is not guaranteed. |
| |
| @param buffer storage for SkPath; may be nullptr |
| @return size of storage required for SkPath; always a multiple of 4 |
| */ |
| size_t writeToMemory(void* buffer) const; |
| |
| /** Write SkPath to buffer, returning the buffer written to, wrapped in data. |
| |
| serialize() writes SkPath::FillType, verb array, SkPoint arrays, conic weight, and |
| additionally writes computed information like SkPath::Convexity and bounds. |
| |
| serialize() should only be used in concert with readFromMemory(). |
| The format used for SkPath in memory is not guaranteed. |
| |
| @return SkPath data wrapped in data buffer |
| */ |
| sk_sp<SkData> serialize() const; |
| |
| /** Initializes SkPath from buffer of size length. Returns zero if the buffer is |
| data is inconsistent, or the length is too small. |
| |
| Reads SkPath::FillType, verb array, SkPoint arrays, conic weight, and |
| additionally reads computed information like SkPath::Convexity and bounds. |
| |
| Used only in concert with writeToMemory(); |
| the format used for SkPath in memory is not guaranteed. |
| |
| @param buffer storage for SkPath |
| @param length buffer size in bytes; must be multiple of 4 |
| @return number of bytes read, or zero on failure |
| */ |
| size_t readFromMemory(const void* buffer, size_t length); |
| |
| /** Returns a non-zero, globally unique value. A different value is returned |
| if verb array, SkPoint arrays, or conic weight changes. |
| |
| Setting SkPath::FillType does not change generation id. |
| |
| Each time the path is modified, a different generation id will be returned. |
| |
| @return non-zero, globally unique value |
| */ |
| uint32_t getGenerationID() const; |
| |
| #ifdef SK_SUPPORT_DIRECT_PATHREF_VALIDATION |
| /** Returns if SkPath data is consistent. Corrupt SkPath data is detected if |
| internal values are out of range or internal storage does not match |
| array dimensions. |
| |
| @return true if SkPath data is consistent |
| */ |
| bool isValid() const { return this->isValidImpl() && fPathRef->isValid(); } |
| #else |
| bool isValid() const { return this->isValidImpl(); } |
| bool pathRefIsValid() const { return fPathRef->isValid(); } |
| #endif |
| |
| private: |
| enum SerializationOffsets { |
| kType_SerializationShift = 28, // requires 4 bits |
| kDirection_SerializationShift = 26, // requires 2 bits |
| kIsVolatile_SerializationShift = 25, // requires 1 bit |
| // 1 free bit at 24 |
| kConvexity_SerializationShift = 16, // requires 8 bits |
| kFillType_SerializationShift = 8, // requires 8 bits |
| // low-8-bits are version |
| }; |
| |
| enum SerializationVersions { |
| kPathPrivFirstDirection_Version = 1, |
| kPathPrivLastMoveToIndex_Version = 2, |
| kPathPrivTypeEnumVersion = 3, |
| kCurrent_Version = 3 |
| }; |
| |
| enum SerializationType { |
| kGeneral = 0, |
| kRRect = 1 |
| }; |
| |
| sk_sp<SkPathRef> fPathRef; |
| int fLastMoveToIndex; |
| uint8_t fFillType; |
| mutable uint8_t fConvexity; |
| mutable SkAtomic<uint8_t, sk_memory_order_relaxed> fFirstDirection;// SkPathPriv::FirstDirection |
| SkBool8 fIsVolatile; |
| |
| /** Resets all fields other than fPathRef to their initial 'empty' values. |
| * Assumes the caller has already emptied fPathRef. |
| * On Android increments fGenerationID without reseting it. |
| */ |
| void resetFields(); |
| |
| /** Sets all fields other than fPathRef to the values in 'that'. |
| * Assumes the caller has already set fPathRef. |
| * Doesn't change fGenerationID or fSourcePath on Android. |
| */ |
| void copyFields(const SkPath& that); |
| |
| size_t writeToMemoryAsRRect(int32_t packedHeader, void* buffer) const; |
| size_t readFromMemoryAsRRect(const void* buffer) const; |
| |
| friend class Iter; |
| friend class SkPathPriv; |
| friend class SkPathStroker; |
| |
| /* Append, in reverse order, the first contour of path, ignoring path's |
| last point. If no moveTo() call has been made for this contour, the |
| first point is automatically set to (0,0). |
| */ |
| void reversePathTo(const SkPath&); |
| |
| // called before we add points for lineTo, quadTo, cubicTo, checking to see |
| // if we need to inject a leading moveTo first |
| // |
| // SkPath path; path.lineTo(...); <--- need a leading moveTo(0, 0) |
| // SkPath path; ... path.close(); path.lineTo(...) <-- need a moveTo(previous moveTo) |
| // |
| inline void injectMoveToIfNeeded(); |
| |
| inline bool hasOnlyMoveTos() const; |
| |
| Convexity internalGetConvexity() const; |
| |
| /** Asserts if SkPath data is inconsistent. |
| Debugging check intended for internal use only. |
| */ |
| SkDEBUGCODE(void validate() const { SkASSERT(this->isValidImpl()); } ) |
| bool isValidImpl() const; |
| SkDEBUGCODE(void validateRef() const { fPathRef->validate(); } ) |
| |
| bool isRectContour(bool allowPartial, int* currVerb, const SkPoint** pts, |
| bool* isClosed, Direction* direction) const; |
| |
| // called by stroker to see if all points (in the last contour) are equal and worthy of a cap |
| bool isZeroLengthSincePoint(int startPtIndex) const; |
| |
| /** Returns if the path can return a bound at no cost (true) or will have to |
| perform some computation (false). |
| */ |
| bool hasComputedBounds() const { |
| SkDEBUGCODE(this->validate();) |
| return fPathRef->hasComputedBounds(); |
| } |
| |
| |
| // 'rect' needs to be sorted |
| void setBounds(const SkRect& rect) { |
| SkPathRef::Editor ed(&fPathRef); |
| |
| ed.setBounds(rect); |
| } |
| |
| void setPt(int index, SkScalar x, SkScalar y); |
| |
| friend class SkAutoPathBoundsUpdate; |
| friend class SkAutoDisableOvalCheck; |
| friend class SkAutoDisableDirectionCheck; |
| friend class SkPathWriter; |
| friend class SkOpBuilder; |
| friend class SkBench_AddPathTest; // perf test reversePathTo |
| friend class PathTest_Private; // unit test reversePathTo |
| friend class ForceIsRRect_Private; // unit test isRRect |
| friend class FuzzPath; // for legacy access to validateRef |
| }; |
| |
| #endif |
