SkRSXform Struct Reference

#include <SkRSXform.h>

Public Member Functions
bool	rectStaysRect () const
void	setIdentity ()
void	set (SkScalar scos, SkScalar ssin, SkScalar tx, SkScalar ty)
void	toQuad (SkScalar width, SkScalar height, SkPoint quad[4]) const
void	toQuad (const SkSize &size, SkPoint quad[4]) const
void	toTriStrip (SkScalar width, SkScalar height, SkPoint strip[4]) const

Static Public Member Functions
static SkRSXform	Make (SkScalar scos, SkScalar ssin, SkScalar tx, SkScalar ty)
static SkRSXform	MakeFromRadians (SkScalar scale, SkScalar radians, SkScalar tx, SkScalar ty, SkScalar ax, SkScalar ay)

Public Attributes
SkScalar	fSCos
SkScalar	fSSin
SkScalar	fTx
SkScalar	fTy

Detailed Description

A compressed form of a rotation+scale matrix.

[ fSCos -fSSin fTx ] [ fSSin fSCos fTy ] [ 0 0 1 ]

Definition at line 23 of file SkRSXform.h.

Member Function Documentation

Make()

static SkRSXform SkRSXform::Make ( SkScalar  scos, SkScalar  ssin, SkScalar  tx, SkScalar  ty  )

inlinestatic

Definition at line 24 of file SkRSXform.h.

                                                                                  {
        SkRSXform xform = { scos, ssin, tx, ty };
        return xform;
    }

MakeFromRadians()

static SkRSXform SkRSXform::MakeFromRadians ( SkScalar  scale, SkScalar  radians, SkScalar  tx, SkScalar  ty, SkScalar  ax, SkScalar  ay  )

inlinestatic

Definition at line 35 of file SkRSXform.h.

                                                               {
        const SkScalar s = SkScalarSin(radians) * scale;
        const SkScalar c = SkScalarCos(radians) * scale;
        return Make(c, s, tx + -c * ax + s * ay, ty + -s * ax - c * ay);
    }

rectStaysRect()

bool SkRSXform::rectStaysRect ( ) const

inline

Definition at line 47 of file SkRSXform.h.

                               {
        return 0 == fSCos || 0 == fSSin;
    }

set()

void SkRSXform::set ( SkScalar  scos, SkScalar  ssin, SkScalar  tx, SkScalar  ty  )

inline

Definition at line 56 of file SkRSXform.h.

                                                                     {
        fSCos = scos;
        fSSin = ssin;
        fTx = tx;
        fTy = ty;
    }

setIdentity()

void SkRSXform::setIdentity ( )

inline

Definition at line 51 of file SkRSXform.h.

                       {
        fSCos = 1;
        fSSin = fTx = fTy = 0;
    }

toQuad() [1/2]

void SkRSXform::toQuad ( const SkSize &  size, SkPoint  quad[4]  ) const

inline

Definition at line 64 of file SkRSXform.h.

                                                           {
        this->toQuad(size.width(), size.height(), quad);
    }

toQuad() [2/2]

void SkRSXform::toQuad	(	SkScalar	width,
		SkScalar	height,
		SkPoint	quad[4]
	)		const

Definition at line 9 of file SkRSXform.cpp.

                                                                             {
#if 0
    // This is the slow way, but it documents what we're doing
    quad[0].set(0, 0);
    quad[1].set(width, 0);
    quad[2].set(width, height);
    quad[3].set(0, height);
    SkMatrix m;
    m.setRSXform(*this).mapPoints(quad, quad, 4);
#else
    const SkScalar m00 = fSCos;
    const SkScalar m01 = -fSSin;
    const SkScalar m02 = fTx;
    const SkScalar m10 = -m01;
    const SkScalar m11 = m00;
    const SkScalar m12 = fTy;
 
    quad[0].set(m02, m12);
    quad[1].set(m00 * width + m02, m10 * width + m12);
    quad[2].set(m00 * width + m01 * height + m02, m10 * width + m11 * height + m12);
    quad[3].set(m01 * height + m02, m11 * height + m12);
#endif
}

toTriStrip()

void SkRSXform::toTriStrip	(	SkScalar	width,
		SkScalar	height,
		SkPoint	strip[4]
	)		const

Definition at line 33 of file SkRSXform.cpp.

                                                                                  {
    const SkScalar m00 = fSCos;
    const SkScalar m01 = -fSSin;
    const SkScalar m02 = fTx;
    const SkScalar m10 = -m01;
    const SkScalar m11 = m00;
    const SkScalar m12 = fTy;
 
    strip[0].set(m02, m12);
    strip[1].set(m01 * height + m02, m11 * height + m12);
    strip[2].set(m00 * width + m02, m10 * width + m12);
    strip[3].set(m00 * width + m01 * height + m02, m10 * width + m11 * height + m12);
}

Member Data Documentation

fSCos

SkScalar SkRSXform::fSCos

Definition at line 42 of file SkRSXform.h.

fSSin

SkScalar SkRSXform::fSSin

Definition at line 43 of file SkRSXform.h.

fTx

SkScalar SkRSXform::fTx

Definition at line 44 of file SkRSXform.h.

fTy

SkScalar SkRSXform::fTy

Definition at line 45 of file SkRSXform.h.

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The documentation for this struct was generated from the following files:

• third_party/skia/include/core/SkRSXform.h
• third_party/skia/src/core/SkRSXform.cpp