/* | |

* 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 SkRRect_DEFINED | |

#define SkRRect_DEFINED | |

#include "include/core/SkPoint.h" | |

#include "include/core/SkRect.h" | |

#include "include/core/SkScalar.h" | |

#include "include/core/SkTypes.h" | |

#include <cstdint> | |

#include <cstring> | |

class SkMatrix; | |

class SkString; | |

/** \class SkRRect | |

SkRRect describes a rounded rectangle with a bounds and a pair of radii for each corner. | |

The bounds and radii can be set so that SkRRect describes: a rectangle with sharp corners; | |

a circle; an oval; or a rectangle with one or more rounded corners. | |

SkRRect allows implementing CSS properties that describe rounded corners. | |

SkRRect may have up to eight different radii, one for each axis on each of its four | |

corners. | |

SkRRect may modify the provided parameters when initializing bounds and radii. | |

If either axis radii is zero or less: radii are stored as zero; corner is square. | |

If corner curves overlap, radii are proportionally reduced to fit within bounds. | |

*/ | |

class SK_API SkRRect { | |

public: | |

/** Initializes bounds at (0, 0), the origin, with zero width and height. | |

Initializes corner radii to (0, 0), and sets type of kEmpty_Type. | |

@return empty SkRRect | |

*/ | |

SkRRect() = default; | |

/** Initializes to copy of rrect bounds and corner radii. | |

@param rrect bounds and corner to copy | |

@return copy of rrect | |

*/ | |

SkRRect(const SkRRect& rrect) = default; | |

/** Copies rrect bounds and corner radii. | |

@param rrect bounds and corner to copy | |

@return copy of rrect | |

*/ | |

SkRRect& operator=(const SkRRect& rrect) = default; | |

/** \enum SkRRect::Type | |

Type describes possible specializations of SkRRect. Each Type is | |

exclusive; a SkRRect may only have one type. | |

Type members become progressively less restrictive; larger values of | |

Type have more degrees of freedom than smaller values. | |

*/ | |

enum Type { | |

kEmpty_Type, //!< zero width or height | |

kRect_Type, //!< non-zero width and height, and zeroed radii | |

kOval_Type, //!< non-zero width and height filled with radii | |

kSimple_Type, //!< non-zero width and height with equal radii | |

kNinePatch_Type, //!< non-zero width and height with axis-aligned radii | |

kComplex_Type, //!< non-zero width and height with arbitrary radii | |

kLastType = kComplex_Type, //!< largest Type value | |

}; | |

Type getType() const { | |

SkASSERT(this->isValid()); | |

return static_cast<Type>(fType); | |

} | |

Type type() const { return this->getType(); } | |

inline bool isEmpty() const { return kEmpty_Type == this->getType(); } | |

inline bool isRect() const { return kRect_Type == this->getType(); } | |

inline bool isOval() const { return kOval_Type == this->getType(); } | |

inline bool isSimple() const { return kSimple_Type == this->getType(); } | |

inline bool isNinePatch() const { return kNinePatch_Type == this->getType(); } | |

inline bool isComplex() const { return kComplex_Type == this->getType(); } | |

/** Returns span on the x-axis. This does not check if result fits in 32-bit float; | |

result may be infinity. | |

@return rect().fRight minus rect().fLeft | |

*/ | |

SkScalar width() const { return fRect.width(); } | |

/** Returns span on the y-axis. This does not check if result fits in 32-bit float; | |

result may be infinity. | |

@return rect().fBottom minus rect().fTop | |

*/ | |

SkScalar height() const { return fRect.height(); } | |

/** Returns top-left corner radii. If type() returns kEmpty_Type, kRect_Type, | |

kOval_Type, or kSimple_Type, returns a value representative of all corner radii. | |

If type() returns kNinePatch_Type or kComplex_Type, at least one of the | |

remaining three corners has a different value. | |

@return corner radii for simple types | |

*/ | |

SkVector getSimpleRadii() const { | |

return fRadii[0]; | |

} | |

/** Sets bounds to zero width and height at (0, 0), the origin. Sets | |

corner radii to zero and sets type to kEmpty_Type. | |

*/ | |

void setEmpty() { *this = SkRRect(); } | |

/** Sets bounds to sorted rect, and sets corner radii to zero. | |

If set bounds has width and height, and sets type to kRect_Type; | |

otherwise, sets type to kEmpty_Type. | |

@param rect bounds to set | |

*/ | |

void setRect(const SkRect& rect) { | |

if (!this->initializeRect(rect)) { | |

return; | |

} | |

memset(fRadii, 0, sizeof(fRadii)); | |

fType = kRect_Type; | |

SkASSERT(this->isValid()); | |

} | |

/** Initializes bounds at (0, 0), the origin, with zero width and height. | |

Initializes corner radii to (0, 0), and sets type of kEmpty_Type. | |

@return empty SkRRect | |

*/ | |

static SkRRect MakeEmpty() { return SkRRect(); } | |

/** Initializes to copy of r bounds and zeroes corner radii. | |

@param r bounds to copy | |

@return copy of r | |

*/ | |

static SkRRect MakeRect(const SkRect& r) { | |

SkRRect rr; | |

rr.setRect(r); | |

return rr; | |

} | |

/** Sets bounds to oval, x-axis radii to half oval.width(), and all y-axis radii | |

to half oval.height(). If oval bounds is empty, sets to kEmpty_Type. | |

Otherwise, sets to kOval_Type. | |

@param oval bounds of oval | |

@return oval | |

*/ | |

static SkRRect MakeOval(const SkRect& oval) { | |

SkRRect rr; | |

rr.setOval(oval); | |

return rr; | |

} | |

/** Sets to rounded rectangle with the same radii for all four corners. | |

If rect is empty, sets to kEmpty_Type. | |

Otherwise, if xRad and yRad are zero, sets to kRect_Type. | |

Otherwise, if xRad is at least half rect.width() and yRad is at least half | |

rect.height(), sets to kOval_Type. | |

Otherwise, sets to kSimple_Type. | |

@param rect bounds of rounded rectangle | |

@param xRad x-axis radius of corners | |

@param yRad y-axis radius of corners | |

@return rounded rectangle | |

*/ | |

static SkRRect MakeRectXY(const SkRect& rect, SkScalar xRad, SkScalar yRad) { | |

SkRRect rr; | |

rr.setRectXY(rect, xRad, yRad); | |

return rr; | |

} | |

/** Sets bounds to oval, x-axis radii to half oval.width(), and all y-axis radii | |

to half oval.height(). If oval bounds is empty, sets to kEmpty_Type. | |

Otherwise, sets to kOval_Type. | |

@param oval bounds of oval | |

*/ | |

void setOval(const SkRect& oval); | |

/** Sets to rounded rectangle with the same radii for all four corners. | |

If rect is empty, sets to kEmpty_Type. | |

Otherwise, if xRad or yRad is zero, sets to kRect_Type. | |

Otherwise, if xRad is at least half rect.width() and yRad is at least half | |

rect.height(), sets to kOval_Type. | |

Otherwise, sets to kSimple_Type. | |

@param rect bounds of rounded rectangle | |

@param xRad x-axis radius of corners | |

@param yRad y-axis radius of corners | |

example: https://fiddle.skia.org/c/@RRect_setRectXY | |

*/ | |

void setRectXY(const SkRect& rect, SkScalar xRad, SkScalar yRad); | |

/** Sets bounds to rect. Sets radii to (leftRad, topRad), (rightRad, topRad), | |

(rightRad, bottomRad), (leftRad, bottomRad). | |

If rect is empty, sets to kEmpty_Type. | |

Otherwise, if leftRad and rightRad are zero, sets to kRect_Type. | |

Otherwise, if topRad and bottomRad are zero, sets to kRect_Type. | |

Otherwise, if leftRad and rightRad are equal and at least half rect.width(), and | |

topRad and bottomRad are equal at least half rect.height(), sets to kOval_Type. | |

Otherwise, if leftRad and rightRad are equal, and topRad and bottomRad are equal, | |

sets to kSimple_Type. Otherwise, sets to kNinePatch_Type. | |

Nine patch refers to the nine parts defined by the radii: one center rectangle, | |

four edge patches, and four corner patches. | |

@param rect bounds of rounded rectangle | |

@param leftRad left-top and left-bottom x-axis radius | |

@param topRad left-top and right-top y-axis radius | |

@param rightRad right-top and right-bottom x-axis radius | |

@param bottomRad left-bottom and right-bottom y-axis radius | |

*/ | |

void setNinePatch(const SkRect& rect, SkScalar leftRad, SkScalar topRad, | |

SkScalar rightRad, SkScalar bottomRad); | |

/** Sets bounds to rect. Sets radii array for individual control of all for corners. | |

If rect is empty, sets to kEmpty_Type. | |

Otherwise, if one of each corner radii are zero, sets to kRect_Type. | |

Otherwise, if all x-axis radii are equal and at least half rect.width(), and | |

all y-axis radii are equal at least half rect.height(), sets to kOval_Type. | |

Otherwise, if all x-axis radii are equal, and all y-axis radii are equal, | |

sets to kSimple_Type. Otherwise, sets to kNinePatch_Type. | |

@param rect bounds of rounded rectangle | |

@param radii corner x-axis and y-axis radii | |

example: https://fiddle.skia.org/c/@RRect_setRectRadii | |

*/ | |

void setRectRadii(const SkRect& rect, const SkVector radii[4]); | |

/** \enum SkRRect::Corner | |

The radii are stored: top-left, top-right, bottom-right, bottom-left. | |

*/ | |

enum Corner { | |

kUpperLeft_Corner, //!< index of top-left corner radii | |

kUpperRight_Corner, //!< index of top-right corner radii | |

kLowerRight_Corner, //!< index of bottom-right corner radii | |

kLowerLeft_Corner, //!< index of bottom-left corner radii | |

}; | |

/** Returns bounds. Bounds may have zero width or zero height. Bounds right is | |

greater than or equal to left; bounds bottom is greater than or equal to top. | |

Result is identical to getBounds(). | |

@return bounding box | |

*/ | |

const SkRect& rect() const { return fRect; } | |

/** Returns scalar pair for radius of curve on x-axis and y-axis for one corner. | |

Both radii may be zero. If not zero, both are positive and finite. | |

@return x-axis and y-axis radii for one corner | |

*/ | |

SkVector radii(Corner corner) const { return fRadii[corner]; } | |

/** Returns bounds. Bounds may have zero width or zero height. Bounds right is | |

greater than or equal to left; bounds bottom is greater than or equal to top. | |

Result is identical to rect(). | |

@return bounding box | |

*/ | |

const SkRect& getBounds() const { return fRect; } | |

/** Returns true if bounds and radii in a are equal to bounds and radii in b. | |

a and b are not equal if either contain NaN. a and b are equal if members | |

contain zeroes with different signs. | |

@param a SkRect bounds and radii to compare | |

@param b SkRect bounds and radii to compare | |

@return true if members are equal | |

*/ | |

friend bool operator==(const SkRRect& a, const SkRRect& b) { | |

return a.fRect == b.fRect && SkScalarsEqual(&a.fRadii[0].fX, &b.fRadii[0].fX, 8); | |

} | |

/** Returns true if bounds and radii in a are not equal to bounds and radii in b. | |

a and b are not equal if either contain NaN. a and b are equal if members | |

contain zeroes with different signs. | |

@param a SkRect bounds and radii to compare | |

@param b SkRect bounds and radii to compare | |

@return true if members are not equal | |

*/ | |

friend bool operator!=(const SkRRect& a, const SkRRect& b) { | |

return a.fRect != b.fRect || !SkScalarsEqual(&a.fRadii[0].fX, &b.fRadii[0].fX, 8); | |

} | |

/** Copies SkRRect to dst, then insets dst bounds by dx and dy, and adjusts dst | |

radii by dx and dy. dx and dy may be positive, negative, or zero. dst may be | |

SkRRect. | |

If either corner radius is zero, the corner has no curvature and is unchanged. | |

Otherwise, if adjusted radius becomes negative, pins radius to zero. | |

If dx exceeds half dst bounds width, dst bounds left and right are set to | |

bounds x-axis center. If dy exceeds half dst bounds height, dst bounds top and | |

bottom are set to bounds y-axis center. | |

If dx or dy cause the bounds to become infinite, dst bounds is zeroed. | |

@param dx added to rect().fLeft, and subtracted from rect().fRight | |

@param dy added to rect().fTop, and subtracted from rect().fBottom | |

@param dst insets bounds and radii | |

example: https://fiddle.skia.org/c/@RRect_inset | |

*/ | |

void inset(SkScalar dx, SkScalar dy, SkRRect* dst) const; | |

/** Insets bounds by dx and dy, and adjusts radii by dx and dy. dx and dy may be | |

positive, negative, or zero. | |

If either corner radius is zero, the corner has no curvature and is unchanged. | |

Otherwise, if adjusted radius becomes negative, pins radius to zero. | |

If dx exceeds half bounds width, bounds left and right are set to | |

bounds x-axis center. If dy exceeds half bounds height, bounds top and | |

bottom are set to bounds y-axis center. | |

If dx or dy cause the bounds to become infinite, bounds is zeroed. | |

@param dx added to rect().fLeft, and subtracted from rect().fRight | |

@param dy added to rect().fTop, and subtracted from rect().fBottom | |

*/ | |

void inset(SkScalar dx, SkScalar dy) { | |

this->inset(dx, dy, this); | |

} | |

/** Outsets dst bounds by dx and dy, and adjusts radii by dx and dy. dx and dy may be | |

positive, negative, or zero. | |

If either corner radius is zero, the corner has no curvature and is unchanged. | |

Otherwise, if adjusted radius becomes negative, pins radius to zero. | |

If dx exceeds half dst bounds width, dst bounds left and right are set to | |

bounds x-axis center. If dy exceeds half dst bounds height, dst bounds top and | |

bottom are set to bounds y-axis center. | |

If dx or dy cause the bounds to become infinite, dst bounds is zeroed. | |

@param dx subtracted from rect().fLeft, and added to rect().fRight | |

@param dy subtracted from rect().fTop, and added to rect().fBottom | |

@param dst outset bounds and radii | |

*/ | |

void outset(SkScalar dx, SkScalar dy, SkRRect* dst) const { | |

this->inset(-dx, -dy, dst); | |

} | |

/** Outsets bounds by dx and dy, and adjusts radii by dx and dy. dx and dy may be | |

positive, negative, or zero. | |

If either corner radius is zero, the corner has no curvature and is unchanged. | |

Otherwise, if adjusted radius becomes negative, pins radius to zero. | |

If dx exceeds half bounds width, bounds left and right are set to | |

bounds x-axis center. If dy exceeds half bounds height, bounds top and | |

bottom are set to bounds y-axis center. | |

If dx or dy cause the bounds to become infinite, bounds is zeroed. | |

@param dx subtracted from rect().fLeft, and added to rect().fRight | |

@param dy subtracted from rect().fTop, and added to rect().fBottom | |

*/ | |

void outset(SkScalar dx, SkScalar dy) { | |

this->inset(-dx, -dy, this); | |

} | |

/** Translates SkRRect by (dx, dy). | |

@param dx offset added to rect().fLeft and rect().fRight | |

@param dy offset added to rect().fTop and rect().fBottom | |

*/ | |

void offset(SkScalar dx, SkScalar dy) { | |

fRect.offset(dx, dy); | |

} | |

/** Returns SkRRect translated by (dx, dy). | |

@param dx offset added to rect().fLeft and rect().fRight | |

@param dy offset added to rect().fTop and rect().fBottom | |

@return SkRRect bounds offset by (dx, dy), with unchanged corner radii | |

*/ | |

[[nodiscard]] SkRRect makeOffset(SkScalar dx, SkScalar dy) const { | |

return SkRRect(fRect.makeOffset(dx, dy), fRadii, fType); | |

} | |

/** Returns true if rect is inside the bounds and corner radii, and if | |

SkRRect and rect are not empty. | |

@param rect area tested for containment | |

@return true if SkRRect contains rect | |

example: https://fiddle.skia.org/c/@RRect_contains | |

*/ | |

bool contains(const SkRect& rect) const; | |

/** Returns true if bounds and radii values are finite and describe a SkRRect | |

SkRRect::Type that matches getType(). All SkRRect methods construct valid types, | |

even if the input values are not valid. Invalid SkRRect data can only | |

be generated by corrupting memory. | |

@return true if bounds and radii match type() | |

example: https://fiddle.skia.org/c/@RRect_isValid | |

*/ | |

bool isValid() const; | |

static constexpr size_t kSizeInMemory = 12 * sizeof(SkScalar); | |

/** Writes SkRRect to buffer. Writes kSizeInMemory bytes, and returns | |

kSizeInMemory, the number of bytes written. | |

@param buffer storage for SkRRect | |

@return bytes written, kSizeInMemory | |

example: https://fiddle.skia.org/c/@RRect_writeToMemory | |

*/ | |

size_t writeToMemory(void* buffer) const; | |

/** Reads SkRRect from buffer, reading kSizeInMemory bytes. | |

Returns kSizeInMemory, bytes read if length is at least kSizeInMemory. | |

Otherwise, returns zero. | |

@param buffer memory to read from | |

@param length size of buffer | |

@return bytes read, or 0 if length is less than kSizeInMemory | |

example: https://fiddle.skia.org/c/@RRect_readFromMemory | |

*/ | |

size_t readFromMemory(const void* buffer, size_t length); | |

/** Transforms by SkRRect by matrix, storing result in dst. | |

Returns true if SkRRect transformed can be represented by another SkRRect. | |

Returns false if matrix contains transformations that are not axis aligned. | |

Asserts in debug builds if SkRRect equals dst. | |

@param matrix SkMatrix specifying the transform | |

@param dst SkRRect to store the result | |

@return true if transformation succeeded. | |

example: https://fiddle.skia.org/c/@RRect_transform | |

*/ | |

bool transform(const SkMatrix& matrix, SkRRect* dst) const; | |

/** Writes text representation of SkRRect to standard output. | |

Set asHex true to generate exact binary representations | |

of floating point numbers. | |

@param asHex true if SkScalar values are written as hexadecimal | |

example: https://fiddle.skia.org/c/@RRect_dump | |

*/ | |

void dump(bool asHex) const; | |

SkString dumpToString(bool asHex) const; | |

/** Writes text representation of SkRRect 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 | |

SkRRect from output. | |

*/ | |

void dump() const { this->dump(false); } | |

/** Writes text representation of SkRRect 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 SkRRect. | |

*/ | |

void dumpHex() const { this->dump(true); } | |

private: | |

static bool AreRectAndRadiiValid(const SkRect&, const SkVector[4]); | |

SkRRect(const SkRect& rect, const SkVector radii[4], int32_t type) | |

: fRect(rect) | |

, fRadii{radii[0], radii[1], radii[2], radii[3]} | |

, fType(type) {} | |

/** | |

* Initializes fRect. If the passed in rect is not finite or empty the rrect will be fully | |

* initialized and false is returned. Otherwise, just fRect is initialized and true is returned. | |

*/ | |

bool initializeRect(const SkRect&); | |

void computeType(); | |

bool checkCornerContainment(SkScalar x, SkScalar y) const; | |

// Returns true if the radii had to be scaled to fit rect | |

bool scaleRadii(); | |

SkRect fRect = SkRect::MakeEmpty(); | |

// Radii order is UL, UR, LR, LL. Use Corner enum to index into fRadii[] | |

SkVector fRadii[4] = {{0, 0}, {0, 0}, {0,0}, {0,0}}; | |

// use an explicitly sized type so we're sure the class is dense (no uninitialized bytes) | |

int32_t fType = kEmpty_Type; | |

// TODO: add padding so we can use memcpy for flattening and not copy uninitialized data | |

// to access fRadii directly | |

friend class SkPath; | |

friend class SkRRectPriv; | |

}; | |

#endif |