Home | History | Annotate | Download | only in MagickCore 
      1 /*
      2   Copyright 1999-2016 ImageMagick Studio LLC, a non-profit organization
      3   dedicated to making software imaging solutions freely available.
      4 
      5   You may not use this file except in compliance with the License.
      6   obtain a copy of the License at
      7 
      8     http://www.imagemagick.org/script/license.php
      9 
     10   Unless required by applicable law or agreed to in writing, software
     11   distributed under the License is distributed on an "AS IS" BASIS,
     12   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13   See the License for the specific language governing permissions and
     14   limitations under the License.
     15 
     16   MagickCore image colorspace private methods.
     17 */
     18 #ifndef MAGICKCORE_COLORSPACE_PRIVATE_H
     19 #define MAGICKCORE_COLORSPACE_PRIVATE_H
     20 
     21 #include "MagickCore/image.h"
     22 #include "MagickCore/image-private.h"
     23 #include "MagickCore/pixel.h"
     24 #include "MagickCore/pixel-accessor.h"
     25 
     26 #if defined(__cplusplus) || defined(c_plusplus)
     27 extern "C" {
     28 #endif
     29 
     30 static inline void ConvertCMYKToRGB(PixelInfo *pixel)
     31 {
     32   pixel->red=((QuantumRange-(QuantumScale*pixel->red*(QuantumRange-
     33     pixel->black)+pixel->black)));
     34   pixel->green=((QuantumRange-(QuantumScale*pixel->green*(QuantumRange-
     35     pixel->black)+pixel->black)));
     36   pixel->blue=((QuantumRange-(QuantumScale*pixel->blue*(QuantumRange-
     37     pixel->black)+pixel->black)));
     38 }
     39 
     40 static inline void ConvertRGBToCMYK(PixelInfo *pixel)
     41 {
     42   MagickRealType
     43     black,
     44     blue,
     45     cyan,
     46     green,
     47     magenta,
     48     red,
     49     yellow;
     50 
     51   if (pixel->colorspace != sRGBColorspace)
     52     {
     53       red=QuantumScale*pixel->red;
     54       green=QuantumScale*pixel->green;
     55       blue=QuantumScale*pixel->blue;
     56     }
     57   else
     58     {
     59       red=QuantumScale*DecodePixelGamma(pixel->red);
     60       green=QuantumScale*DecodePixelGamma(pixel->green);
     61       blue=QuantumScale*DecodePixelGamma(pixel->blue);
     62     }
     63   if ((fabs((double) red) < MagickEpsilon) &&
     64       (fabs((double) green) < MagickEpsilon) &&
     65       (fabs((double) blue) < MagickEpsilon))
     66     {
     67       pixel->black=(MagickRealType) QuantumRange;
     68       return;
     69     }
     70   cyan=(MagickRealType) (1.0-red);
     71   magenta=(MagickRealType) (1.0-green);
     72   yellow=(MagickRealType) (1.0-blue);
     73   black=cyan;
     74   if (magenta < black)
     75     black=magenta;
     76   if (yellow < black)
     77     black=yellow;
     78   cyan=(MagickRealType) ((cyan-black)/(1.0-black));
     79   magenta=(MagickRealType) ((magenta-black)/(1.0-black));
     80   yellow=(MagickRealType) ((yellow-black)/(1.0-black));
     81   pixel->colorspace=CMYKColorspace;
     82   pixel->red=QuantumRange*cyan;
     83   pixel->green=QuantumRange*magenta;
     84   pixel->blue=QuantumRange*yellow;
     85   pixel->black=QuantumRange*black;
     86 }
     87 
     88 static inline MagickBooleanType IsCMYKColorspace(
     89   const ColorspaceType colorspace)
     90 {
     91   if (colorspace == CMYKColorspace)
     92     return(MagickTrue);
     93   return(MagickFalse);
     94 }
     95 
     96 static inline MagickBooleanType IsGrayColorspace(
     97   const ColorspaceType colorspace)
     98 {
     99   if (colorspace == GRAYColorspace)
    100     return(MagickTrue);
    101   return(MagickFalse);
    102 }
    103 
    104 static inline MagickBooleanType IsRGBColorspace(const ColorspaceType colorspace)
    105 {
    106   if ((colorspace == RGBColorspace) || (colorspace == scRGBColorspace))
    107     return(MagickTrue);
    108   return(MagickFalse);
    109 }
    110 
    111 static inline MagickBooleanType IssRGBColorspace(
    112   const ColorspaceType colorspace)
    113 {
    114   if ((colorspace == sRGBColorspace) || (colorspace == TransparentColorspace))
    115     return(MagickTrue);
    116   return(MagickFalse);
    117 }
    118 
    119 static inline MagickBooleanType IssRGBCompatibleColorspace(
    120   const ColorspaceType colorspace)
    121 {
    122   if ((colorspace == sRGBColorspace) || (colorspace == RGBColorspace) ||
    123       (colorspace == scRGBColorspace) ||
    124       (IsGrayColorspace(colorspace) != MagickFalse))
    125     return(MagickTrue);
    126   return(MagickFalse);
    127 }
    128 
    129 #if defined(__cplusplus) || defined(c_plusplus)
    130 }
    131 #endif
    132 
    133 #endif
    134