ImageFilter.h

#pragma once
 
#include <Foundation/Containers/HybridArray.h>
#include <Foundation/SimdMath/SimdFloat.h>
#include <Texture/TextureDLL.h>
 
class PL_TEXTURE_DLL plImageFilter
{
public:
  virtual plSimdFloat SamplePoint(const plSimdFloat& x) const = 0;
 
  plSimdFloat GetWidth() const;
 
protected:
  plImageFilter(float width);
 
private:
  plSimdFloat m_fWidth;
};
 
class PL_TEXTURE_DLL plImageFilterBox : public plImageFilter
{
public:
  plImageFilterBox(float fWidth = 0.5f);
 
  virtual plSimdFloat SamplePoint(const plSimdFloat& x) const override;
};
 
class PL_TEXTURE_DLL plImageFilterTriangle : public plImageFilter
{
public:
  plImageFilterTriangle(float fWidth = 1.0f);
 
  virtual plSimdFloat SamplePoint(const plSimdFloat& x) const override;
};
 
class PL_TEXTURE_DLL plImageFilterSincWithKaiserWindow : public plImageFilter
{
public:
  plImageFilterSincWithKaiserWindow(float fWindowWidth = 3.0f, float fBeta = 4.0f);
 
  virtual plSimdFloat SamplePoint(const plSimdFloat& x) const override;
 
private:
  plSimdFloat m_fBeta;
  plSimdFloat m_fInvBesselBeta;
};
 
class PL_TEXTURE_DLL plImageFilterWeights
{
public:
  plImageFilterWeights(const plImageFilter& filter, plUInt32 uiSrcSamples, plUInt32 uiDstSamples);
 
  plUInt32 GetNumWeights() const;
 
  plSimdFloat GetWeight(plUInt32 uiDstSampleIndex, plUInt32 uiWeightIndex) const;
 
  inline plInt32 GetFirstSourceSampleIndex(plUInt32 uiDstSampleIndex) const;
 
  plArrayPtr<const float> ViewWeights() const;
 
private:
  plHybridArray<float, 16> m_Weights;
  plSimdFloat m_fWidthInSourceSpace;
  plSimdFloat m_fSourceToDestScale;
  plSimdFloat m_fDestToSourceScale;
  plUInt32 m_uiNumWeights;
  plUInt32 m_uiDstSamplesReduced;
};
 
#include <Texture/Image/Implementation/ImageFilter_inl.h>