text: /*
    Copyright 1999-2020 ImageMagick Studio LLC, a non-profit organization
    dedicated to making software imaging solutions freely available.
  
    You may not use this file except in compliance with the License.  You may
    obtain a copy of the License at
  
      https://imagemagick.org/script/license.php
  
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
  
    MagickCore pixel accessor methods.
  */
  #ifndef MAGICKCORE_PIXEL_ACCESSOR_H
  #define MAGICKCORE_PIXEL_ACCESSOR_H
  
  #include <math.h>
  #include "magick/gem.h"
  #include "magick/pixel.h"
  
  #if defined(__cplusplus) || defined(c_plusplus)
  extern "C" {
  #endif
  
  #define ClampPixelRed(pixel) ClampToQuantum((pixel)->red)
  #define ClampPixelGreen(pixel) ClampToQuantum((pixel)->green)
  #define ClampPixelBlue(pixel) ClampToQuantum((pixel)->blue)
  #define ClampPixelIndex(indexes) ClampToQuantum(*(indexes))
  #define ClampPixelOpacity(pixel) ClampToQuantum((pixel)->opacity)
  #define GetPixela(pixel) ((pixel)->green)
  #define GetPixelb(pixel) ((pixel)->blue)
  #define GetPixelAlpha(pixel) (QuantumRange-(pixel)->opacity)
  #define GetPixelBlack(indexes) (*(indexes))
  #define GetPixelBlue(pixel) ((pixel)->blue)
  #define GetPixelCb(pixel) ((pixel)->green)
  #define GetPixelCr(pixel) ((pixel)->blue)
  #define GetPixelCyan(pixel) ((pixel)->red)
  #define GetPixelGray(pixel) ((pixel)->red)
  #define GetPixelGreen(pixel) ((pixel)->green)
  #define GetPixelIndex(indexes)  (*(indexes))
  #define GetPixelL(pixel) ((pixel)->red)
  #define GetPixelLabel(pixel) ((ssize_t) (pixel)->red)
  #define GetPixelMagenta(pixel) ((pixel)->green)
  #define GetPixelNext(pixel)  ((pixel)+1)
  #define GetPixelOpacity(pixel) ((pixel)->opacity)
  #define GetPixelRed(pixel) ((pixel)->red)
  #define GetPixelRGB(pixel,packet) \
  { \
    (packet)->red=GetPixelRed((pixel)); \
    (packet)->green=GetPixelGreen((pixel)); \
    (packet)->blue=GetPixelBlue((pixel)); \
  }
  #define GetPixelRGBO(pixel,packet) \
  { \
    (packet)->red=GetPixelRed((pixel)); \
    (packet)->green=GetPixelGreen((pixel)); \
    (packet)->blue=GetPixelBlue((pixel)); \
    (packet)->opacity=GetPixelOpacity((pixel)); \
  }
  #define GetPixelY(pixel) ((pixel)->red)
  #define GetPixelYellow(pixel) ((pixel)->blue)
  #define SetPixela(pixel,value) ((pixel)->green=(Quantum) (value))
  #define SetPixelAlpha(pixel,value) \
    ((pixel)->opacity=(Quantum) (QuantumRange-(value)))
  #define SetPixelb(pixel,value) ((pixel)->blue=(Quantum) (value))
  #define SetPixelBlack(indexes,value) (*(indexes)=(Quantum) (value))
  #define SetPixelBlue(pixel,value) ((pixel)->blue=(Quantum) (value))
  #define SetPixelCb(pixel,value) ((pixel)->green=(Quantum) (value))
  #define SetPixelCr(pixel,value) ((pixel)->blue=(Quantum) (value))
  #define SetPixelCyan(pixel,value) ((pixel)->red=(Quantum) (value))
  #define SetPixelGray(pixel,value) \
    ((pixel)->red=(pixel)->green=(pixel)->blue=(Quantum) (value))
  #define SetPixelGreen(pixel,value) ((pixel)->green=(Quantum) (value))
  #define SetPixelIndex(indexes,value) (*(indexes)=(IndexPacket) (value))
  #define SetPixelL(pixel,value) ((pixel)->red=(Quantum) (value))
  #define SetPixelMagenta(pixel,value) ((pixel)->green=(Quantum) (value))
  #define SetPixelOpacity(pixel,value) ((pixel)->opacity=(Quantum) (value))
  #define SetPixelRed(pixel,value) ((pixel)->red=(Quantum) (value))
  #define SetPixelRgb(pixel,packet) \
  { \
    SetPixelRed(pixel,(packet)->red); \
    SetPixelGreen(pixel,(packet)->green); \
    SetPixelBlue(pixel,(packet)->blue); \
  }
  #define SetPixelRGBA(pixel,packet) \
  { \
    SetPixelRed(pixel,(packet)->red); \
    SetPixelGreen(pixel,(packet)->green); \
    SetPixelBlue(pixel,(packet)->blue); \
    SetPixelAlpha(pixel,(QuantumRange-(packet)->opacity)); \
  }
  #define SetPixelRGBO(pixel,packet) \
  { \
    SetPixelRed(pixel,(packet)->red); \
    SetPixelGreen(pixel,(packet)->green); \
    SetPixelBlue(pixel,(packet)->blue); \
    SetPixelOpacity(pixel,(packet)->opacity); \
  }
  #define SetPixelYellow(pixel,value) ((pixel)->blue=(Quantum) (value))
  #define SetPixelY(pixel,value) ((pixel)->red=(Quantum) (value))
  
  static inline MagickRealType AbsolutePixelValue(const MagickRealType x)
  {
    return(x < 0.0f ? -x : x);
  }
  
  static inline Quantum ClampPixel(const MagickRealType value)
  { 
    if (value < 0.0f)
      return((Quantum) 0); 
    if (value >= (MagickRealType) QuantumRange)
      return((Quantum) QuantumRange);
  #if !defined(MAGICKCORE_HDRI_SUPPORT)
    return((Quantum) (value+0.5f));
  #else
    return((Quantum) value);
  #endif
  }
  
  static inline double PerceptibleReciprocal(const double x)
  { 
    double
      sign;
        
    /*
      Return 1/x where x is perceptible (not unlimited or infinitesimal).
    */
    sign=x < 0.0 ? -1.0 : 1.0;
    if ((sign*x) >= MagickEpsilon)
      return(1.0/x);
    return(sign/MagickEpsilon);
  }   
  
  static inline MagickRealType GetPixelLuma(const Image *magick_restrict image,
    const PixelPacket *magick_restrict pixel)
  {
    MagickRealType
      intensity;
  
    (void) image;
    intensity=(MagickRealType) (0.212656f*pixel->red+0.715158f*pixel->green+
      0.072186f*pixel->blue);
    return(intensity);
  }
  
  static inline MagickRealType GetPixelLuminance(
    const Image *magick_restrict image,const PixelPacket *magick_restrict pixel)
  {
    MagickRealType
      intensity;
  
    if (image->colorspace != sRGBColorspace)
      {
        intensity=(MagickRealType) (0.212656f*pixel->red+0.715158f*pixel->green+
          0.072186f*pixel->blue);
        return(intensity);
      }
    intensity=(MagickRealType) (0.212656f*DecodePixelGamma((MagickRealType)
      pixel->red)+0.715158f*DecodePixelGamma((MagickRealType) pixel->green)+
      0.072186f*DecodePixelGamma((MagickRealType) pixel->blue));
    return(intensity);
  }
  
  static inline MagickBooleanType IsPixelAtDepth(const Quantum pixel,
    const QuantumAny range)
  {
    Quantum
      quantum;
  
    if (range == 0)
      return(MagickTrue);
  #if !defined(MAGICKCORE_HDRI_SUPPORT)
    quantum=(Quantum) (((MagickRealType) QuantumRange*((QuantumAny)
      (((MagickRealType) range*pixel)/QuantumRange+0.5)))/range+0.5);
  #else
    quantum=(Quantum) (((MagickRealType) QuantumRange*((QuantumAny)
      (((MagickRealType) range*pixel)/QuantumRange+0.5)))/range);
  #endif
    return(pixel == quantum ? MagickTrue : MagickFalse);
  }
  
  static inline MagickBooleanType IsPixelGray(const PixelPacket *pixel)
  {
    MagickRealType
      green_blue,
      red_green;
  
    red_green=(MagickRealType) pixel->red-pixel->green;
    green_blue=(MagickRealType) pixel->green-pixel->blue;
    if (((QuantumScale*AbsolutePixelValue(red_green)) < MagickEpsilon) &&
        ((QuantumScale*AbsolutePixelValue(green_blue)) < MagickEpsilon))
      return(MagickTrue);
    return(MagickFalse);
  }
  
  static inline MagickBooleanType IsPixelMonochrome(const PixelPacket *pixel)
  {
    MagickRealType
      green_blue,
      red,
      red_green;
  
    red=(MagickRealType) pixel->red;
    if ((AbsolutePixelValue(red) >= MagickEpsilon) &&
        (AbsolutePixelValue(red-QuantumRange) >= MagickEpsilon))
      return(MagickFalse);
    red_green=(MagickRealType) pixel->red-pixel->green;
    green_blue=(MagickRealType) pixel->green-pixel->blue;
    if (((QuantumScale*AbsolutePixelValue(red_green)) < MagickEpsilon) &&
        ((QuantumScale*AbsolutePixelValue(green_blue)) < MagickEpsilon))
      return(MagickTrue);
    return(MagickFalse);
  }
  
  static inline Quantum PixelPacketIntensity(const PixelPacket *pixel)
  {
    MagickRealType
      intensity;
  
    if ((pixel->red  == pixel->green) && (pixel->green == pixel->blue))
      return(pixel->red);
    intensity=(MagickRealType) (0.212656*pixel->red+0.715158*pixel->green+
      0.072186*pixel->blue);
    return(ClampToQuantum(intensity));
  }
  
  static inline void SetPixelViaMagickPixel(const Image *magick_restrict image,
    const MagickPixelPacket *magick_restrict magick_pixel,
    PixelPacket *magick_restrict pixel)
  { 
    pixel->red=ClampToQuantum(magick_pixel->red);
    pixel->green=ClampToQuantum(magick_pixel->green);
    pixel->blue=ClampToQuantum(magick_pixel->blue);
    if (image->matte != MagickFalse)
      pixel->opacity=ClampToQuantum(magick_pixel->opacity);
  }
  
  #if defined(__cplusplus) || defined(c_plusplus)
  }
  #endif
  
  #endif
  