PtexWidth4Filter Class Reference

Separable filter with width=4 support. More...

Inheritance diagram for PtexWidth4Filter:

## Public Types

typedef float | KernelFn(float x, const float *c)
Public Types inherited from PtexFilter
enum | FilterType { f_point , f_bilinear , f_box , f_gaussian , f_bicubic , f_bspline , f_catmullrom , f_mitchell }
| Filter types. More...

## Public Member Functions

| PtexWidth4Filter (PtexTexture *tx, const PtexFilter::Options &opts, KernelFn k, const float *c=0)
virtual void | buildKernel (PtexSeparableKernel &k, float u, float v, float uw, float vw, Res faceRes)
Public Member Functions inherited from PtexSeparableFilter
virtual void | release ()
| Release resources held by this pointer (pointer becomes invalid).
virtual void | eval (float *result, int firstchan, int nchannels, int faceid, float u, float v, float uw1, float vw1, float uw2, float vw2, float width, float blur)
| Apply filter to a ptex data file.

## Private Member Functions

float | blur (float x)
void | buildKernelAxis (int8_t &k_ureslog2, int &k_u, int &k_uw, float *ku, float u, float uw, int f_ureslog2)

## Private Attributes

KernelFn * | _k
const float * | _c

## Additional Inherited Members

Static Public Member Functions inherited from PtexFilter
static PtexFilter * | getFilter (PtexTexture *tx, const Options &opts)
Protected Member Functions inherited from PtexSeparableFilter
| PtexSeparableFilter (PtexTexture *tx, const PtexFilter::Options &opts)
virtual | ~PtexSeparableFilter ()
void | splitAndApply (PtexSeparableKernel &k, int faceid, const Ptex::FaceInfo &f)
void | applyAcrossEdge (PtexSeparableKernel &k, int faceid, const Ptex::FaceInfo &f, int eid)
void | applyToCorner (PtexSeparableKernel &k, int faceid, const Ptex::FaceInfo &f, int eid)
void | applyToCornerFace (PtexSeparableKernel &k, const Ptex::FaceInfo &f, int eid, int cfaceid, const Ptex::FaceInfo &cf, int ceid)
void | apply (PtexSeparableKernel &k, int faceid, const Ptex::FaceInfo &f)
Protected Member Functions inherited from PtexFilter
virtual | ~PtexFilter ()
| Destructor not for public use. Use release() instead.
Protected Attributes inherited from PtexSeparableFilter
PtexTexture * | _tx
Options | _options
float * | _result
float | _weight
int | _firstChanOffset
int | _nchan
int | _ntxchan
DataType | _dt
BorderMode | _uMode
BorderMode | _vMode
EdgeFilterMode | _efm

## Detailed Description

Separable filter with width=4 support.

The kernel width is calculated as a multiple of 4 times the filter width and the texture resolution is chosen such that each kernel axis has between 4 and 8.

For kernel widths too large to handle (because the kernel would extend significantly beyond both sides of the face), a special Hermite smoothstep is used to interpolate the two nearest 2 samples along the affected axis (or axes).

Definition at line 116 of file PtexFilters.cpp.

## Member Typedef Documentation

## KernelFn

typedef float PtexWidth4Filter::KernelFn(float x, const float *c)

Definition at line 119 of file PtexFilters.cpp.

## Constructor & Destructor Documentation

## PtexWidth4Filter()

PtexWidth4Filter::PtexWidth4Filter | ( | PtexTexture * | tx,
|  | const PtexFilter::Options & | opts,
|  | KernelFn | k,
|  | const float * | c = `0`
| ) |  |

inline

Definition at line 121 of file PtexFilters.cpp.

## Member Function Documentation

## blur()

float PtexWidth4Filter::blur | ( | float | x | ) |

inlineprivate

Definition at line 133 of file PtexFilters.cpp.

References PtexUtils::abs().

Referenced by buildKernelAxis().

## buildKernel()

virtual void PtexWidth4Filter::buildKernel | ( | PtexSeparableKernel & | k,
|  | float | u,
|  | float | v,
|  | float | uw,
|  | float | vw,
|  | Res | faceRes
| ) |  |

inlinevirtual

Implements PtexSeparableFilter.

Definition at line 124 of file PtexFilters.cpp.

References buildKernelAxis(), PtexSeparableKernel::ku, PtexSeparableKernel::kv, PtexSeparableKernel::res, PtexSeparableKernel::u, PtexSeparableKernel::uw, PtexSeparableKernel::v, and PtexSeparableKernel::vw.

## buildKernelAxis()

void PtexWidth4Filter::buildKernelAxis | ( | int8_t & | k_ureslog2,
|  | int & | k_u,
|  | int & | k_uw,
|  | float * | ku,
|  | float | u,
|  | float | uw,
|  | int | f_ureslog2
| ) |  |

inlineprivate

Definition at line 141 of file PtexFilters.cpp.

References _c, _k, PtexSeparableFilter::_options, blur(), PtexUtils::calcResFromWidth(), PtexFilter::Options::lerp, PtexUtils::max(), and PtexUtils::reciprocalPow2().

Referenced by buildKernel().

## Member Data Documentation

## _c

const float* PtexWidth4Filter::_c

private

Definition at line 247 of file PtexFilters.cpp.

Referenced by buildKernelAxis().

## _k

KernelFn* PtexWidth4Filter::_k

private

Definition at line 246 of file PtexFilters.cpp.

Referenced by buildKernelAxis().

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

- PtexFilters.cpp