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      1 /*
      2   Copyright 1999-2019 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.  You may
      6   obtain a copy of the License at
      7 
      8     https://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 private methods.
     17 */
     18 #ifndef MAGICKCORE_IMAGE_PRIVATE_H
     19 #define MAGICKCORE_IMAGE_PRIVATE_H
     20 
     21 #if defined(__cplusplus) || defined(c_plusplus)
     22 extern "C" {
     23 #endif
     24 
     25 #define MagickAbsoluteValue(x)  ((x) < 0 ? -(x) : (x))
     26 #define MagickMax(x,y)  (((x) > (y)) ? (x) : (y))
     27 #define MagickMin(x,y)  (((x) < (y)) ? (x) : (y))
     28 #define Magick2PI    6.28318530717958647692528676655900576839433879875020
     29 #define MagickPHI    1.61803398874989484820458683436563811772030917980576
     30 #define MagickPI  3.14159265358979323846264338327950288419716939937510
     31 #define MagickPI2    1.57079632679489661923132169163975144209858469968755
     32 #define MagickSQ1_2  0.70710678118654752440084436210484903928483593768847
     33 #define MagickSQ2    1.41421356237309504880168872420969807856967187537695
     34 #define MagickSQ2PI  2.50662827463100024161235523934010416269302368164062
     35 #define UndefinedTicksPerSecond  100L
     36 #define UndefinedCompressionQuality  0UL
     37 
     38 extern MagickExport const char
     39   AlphaColor[],
     40   BackgroundColor[],
     41   BorderColor[],
     42   DefaultTileFrame[],
     43   DefaultTileGeometry[],
     44   DefaultTileLabel[],
     45   ForegroundColor[],
     46   LoadImageTag[],
     47   LoadImagesTag[],
     48   PSDensityGeometry[],
     49   PSPageGeometry[],
     50   SaveImageTag[],
     51   SaveImagesTag[];
     52 
     53 extern MagickExport const double
     54   DefaultResolution;
     55 
     56 static inline double DegreesToRadians(const double degrees)
     57 {
     58   return((double) (MagickPI*degrees/180.0));
     59 }
     60 
     61 static inline double RadiansToDegrees(const double radians)
     62 {
     63   return((double) (180.0*radians/MagickPI));
     64 }
     65 
     66 static inline unsigned char ScaleColor5to8(const unsigned int color)
     67 {
     68   return((unsigned char) (((color) << 3) | ((color) >> 2)));
     69 }
     70 
     71 static inline unsigned char ScaleColor6to8(const unsigned int color)
     72 {
     73   return((unsigned char) (((color) << 2) | ((color) >> 4)));
     74 }
     75 
     76 static inline unsigned int ScaleColor8to5(const unsigned char color)
     77 {
     78   return((unsigned int) (((color) & ~0x07) >> 3));
     79 }
     80 
     81 static inline unsigned int ScaleColor8to6(const unsigned char color)
     82 {
     83   return((unsigned int) (((color) & ~0x03) >> 2));
     84 }
     85 
     86 #if defined(__cplusplus) || defined(c_plusplus)
     87 }
     88 #endif
     89 
     90 #endif
     91