SkRRect.h

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/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef SkRRect_DEFINED
#define SkRRect_DEFINED
 
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
 
class SkPath;
class SkMatrix;
class SkString;
 
class SK_API SkRRect {
public:
 
    SkRRect() = default;
 
    SkRRect(const SkRRect& rrect) = default;
 
    SkRRect& operator=(const SkRRect& rrect) = default;
 
    enum Type {
        kEmpty_Type,                     
        kRect_Type,                      
        kOval_Type,                      
        kSimple_Type,                    
        kNinePatch_Type,                 
        kComplex_Type,                   
        kLastType       = kComplex_Type, 
    };
 
    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(); }
 
    SkScalar width() const { return fRect.width(); }
 
    SkScalar height() const { return fRect.height(); }
 
    SkVector getSimpleRadii() const {
        return fRadii[0];
    }
 
    void setEmpty() { *this = SkRRect(); }
 
    void setRect(const SkRect& rect) {
        if (!this->initializeRect(rect)) {
            return;
        }
 
        memset(fRadii, 0, sizeof(fRadii));
        fType = kRect_Type;
 
        SkASSERT(this->isValid());
    }
 
    static SkRRect MakeEmpty() { return SkRRect(); }
 
    static SkRRect MakeRect(const SkRect& r) {
        SkRRect rr;
        rr.setRect(r);
        return rr;
    }
 
    static SkRRect MakeOval(const SkRect& oval) {
        SkRRect rr;
        rr.setOval(oval);
        return rr;
    }
 
    static SkRRect MakeRectXY(const SkRect& rect, SkScalar xRad, SkScalar yRad) {
        SkRRect rr;
        rr.setRectXY(rect, xRad, yRad);
        return rr;
    }
 
    void setOval(const SkRect& oval);
 
    void setRectXY(const SkRect& rect, SkScalar xRad, SkScalar yRad);
 
    void setNinePatch(const SkRect& rect, SkScalar leftRad, SkScalar topRad,
                      SkScalar rightRad, SkScalar bottomRad);
 
    void setRectRadii(const SkRect& rect, const SkVector radii[4]);
 
    enum Corner {
        kUpperLeft_Corner,  
        kUpperRight_Corner, 
        kLowerRight_Corner, 
        kLowerLeft_Corner,  
    };
 
    const SkRect& rect() const { return fRect; }
 
    SkVector radii(Corner corner) const { return fRadii[corner]; }
 
    const SkRect& getBounds() const { return fRect; }
 
    friend bool operator==(const SkRRect& a, const SkRRect& b) {
        return a.fRect == b.fRect && SkScalarsEqual(&a.fRadii[0].fX, &b.fRadii[0].fX, 8);
    }
 
    friend bool operator!=(const SkRRect& a, const SkRRect& b) {
        return a.fRect != b.fRect || !SkScalarsEqual(&a.fRadii[0].fX, &b.fRadii[0].fX, 8);
    }
 
    void inset(SkScalar dx, SkScalar dy, SkRRect* dst) const;
 
    void inset(SkScalar dx, SkScalar dy) {
        this->inset(dx, dy, this);
    }
 
    void outset(SkScalar dx, SkScalar dy, SkRRect* dst) const {
        this->inset(-dx, -dy, dst);
    }
 
    void outset(SkScalar dx, SkScalar dy) {
        this->inset(-dx, -dy, this);
    }
 
    void offset(SkScalar dx, SkScalar dy) {
        fRect.offset(dx, dy);
    }
 
    SkRRect SK_WARN_UNUSED_RESULT makeOffset(SkScalar dx, SkScalar dy) const {
        return SkRRect(fRect.makeOffset(dx, dy), fRadii, fType);
    }
 
    bool contains(const SkRect& rect) const;
 
    bool isValid() const;
 
    static constexpr size_t kSizeInMemory = 12 * sizeof(SkScalar);
 
    size_t writeToMemory(void* buffer) const;
 
    size_t readFromMemory(const void* buffer, size_t length);
 
    bool transform(const SkMatrix& matrix, SkRRect* dst) const;
 
    void dump(bool asHex) const;
    SkString dumpToString(bool asHex) const;
 
    void dump() const { this->dump(false); }
 
    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) {}
 
    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