SkBitmapProcStateAutoMapper Class Reference

#include <SkBitmapProcState.h>

Public Member Functions
	SkBitmapProcStateAutoMapper (const SkBitmapProcState &s, int x, int y, SkPoint *scalarPoint=nullptr)
SkFractionalInt	fractionalIntX () const
SkFractionalInt	fractionalIntY () const
SkFixed	fixedX () const
SkFixed	fixedY () const
int	intX () const
int	intY () const

Detailed Description

Definition at line 160 of file SkBitmapProcState.h.

Constructor & Destructor Documentation

SkBitmapProcStateAutoMapper()

SkBitmapProcStateAutoMapper::SkBitmapProcStateAutoMapper ( const SkBitmapProcState &  s, int  x, int  y, SkPoint *  scalarPoint = nullptr  )

inline

Definition at line 162 of file SkBitmapProcState.h.

                                                                {
        SkPoint pt;
        s.fInvProc(s.fInvMatrix,
                   SkIntToScalar(x) + SK_ScalarHalf,
                   SkIntToScalar(y) + SK_ScalarHalf, &pt);
 
        SkFixed biasX = 0, biasY = 0;
        if (s.fBilerp) {
            biasX = s.fFilterOneX >> 1;
            biasY = s.fFilterOneY >> 1;
        } else {
            // Our rasterizer biases upward. That is a rect from 0.5...1.5 fills pixel 1 and not
            // pixel 0. To make an image that is mapped 1:1 with device pixels but at a half pixel
            // offset select every pixel from the src image once we make exact integer pixel sample
            // values round down not up. Note that a mirror mapping will not have this property.
            biasX = 1;
            biasY = 1;
        }
 
        // punt to unsigned for defined underflow behavior
        fX = (SkFractionalInt)((uint64_t)SkScalarToFractionalInt(pt.x()) -
                               (uint64_t)SkFixedToFractionalInt(biasX));
        fY = (SkFractionalInt)((uint64_t)SkScalarToFractionalInt(pt.y()) -
                               (uint64_t)SkFixedToFractionalInt(biasY));
 
        if (scalarPoint) {
            scalarPoint->set(pt.x() - SkFixedToScalar(biasX),
                             pt.y() - SkFixedToScalar(biasY));
        }
    }

Member Function Documentation

fixedX()

SkFixed SkBitmapProcStateAutoMapper::fixedX ( ) const

inline

Definition at line 197 of file SkBitmapProcState.h.

{ return SkFractionalIntToFixed(fX); }

fixedY()

SkFixed SkBitmapProcStateAutoMapper::fixedY ( ) const

inline

Definition at line 198 of file SkBitmapProcState.h.

{ return SkFractionalIntToFixed(fY); }

fractionalIntX()

SkFractionalInt SkBitmapProcStateAutoMapper::fractionalIntX ( ) const

inline

Definition at line 194 of file SkBitmapProcState.h.

{ return fX; }

fractionalIntY()

SkFractionalInt SkBitmapProcStateAutoMapper::fractionalIntY ( ) const

inline

Definition at line 195 of file SkBitmapProcState.h.

{ return fY; }

intX()

int SkBitmapProcStateAutoMapper::intX ( ) const

inline

Definition at line 200 of file SkBitmapProcState.h.

{ return SkFractionalIntToInt(fX); }

intY()

int SkBitmapProcStateAutoMapper::intY ( ) const

inline

Definition at line 201 of file SkBitmapProcState.h.

{ return SkFractionalIntToInt(fY); }

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The documentation for this class was generated from the following file:

• third_party/skia/src/core/SkBitmapProcState.h