source/libs/poppler/poppler-src/poppler/GfxState_helpers.h

   1 //========================================================================
   2 //
   3 // GfxState.cc
   4 //
   5 // Copyright 1996-2003 Glyph & Cog, LLC
   6 //
   7 //========================================================================
   8
   9 //========================================================================
  10 //
  11 // Modified under the Poppler project - http://poppler.freedesktop.org
  12 //
  13 // All changes made under the Poppler project to this file are licensed
  14 // under GPL version 2 or later
  15 //
  16 // Copyright (C) 2009, 2011 Albert Astals Cid <aacid@kde.org>
  17 //
  18 // To see a description of the changes please see the Changelog file that
  19 // came with your tarball or type make ChangeLog if you are building from git
  20 //
  21 //========================================================================
  22
  23 #include "GfxState.h"
  24
  25 static inline GfxColorComp clip01(GfxColorComp x) {
  26   return (x < 0) ? 0 : (x > gfxColorComp1) ? gfxColorComp1 : x;
  27 }
  28
  29 static inline double clip01(double x) {
  30   return (x < 0) ? 0 : (x > 1) ? 1 : x;
  31 }
  32
  33 static inline void cmykToRGBMatrixMultiplication(const double &c, const double &m, const double &y, const double &k, const double &c1, const double &m1, const double &y1, const double &k1, double &r, double &g, double &b)
  34 {
  35   double x;
  36   // this is a matrix multiplication, unrolled for performance
  37   //                        C M Y K
  38   x = c1 * m1 * y1 * k1; // 0 0 0 0
  39   r = g = b = x;
  40   x = c1 * m1 * y1 * k;  // 0 0 0 1
  41   r += 0.1373 * x;
  42   g += 0.1216 * x;
  43   b += 0.1255 * x;
  44   x = c1 * m1 * y  * k1; // 0 0 1 0
  45   r += x;
  46   g += 0.9490 * x;
  47   x = c1 * m1 * y  * k;  // 0 0 1 1
  48   r += 0.1098 * x;
  49   g += 0.1020 * x;
  50   x = c1 * m  * y1 * k1; // 0 1 0 0
  51   r += 0.9255 * x;
  52   b += 0.5490 * x;
  53   x = c1 * m  * y1 * k;  // 0 1 0 1
  54   r += 0.1412 * x;
  55   x = c1 * m  * y  * k1; // 0 1 1 0
  56   r += 0.9294 * x;
  57   g += 0.1098 * x;
  58   b += 0.1412 * x;
  59   x = c1 * m  * y  * k;  // 0 1 1 1
  60   r += 0.1333 * x;
  61   x = c  * m1 * y1 * k1; // 1 0 0 0
  62   g += 0.6784 * x;
  63   b += 0.9373 * x;
  64   x = c  * m1 * y1 * k;  // 1 0 0 1
  65   g += 0.0588 * x;
  66   b += 0.1412 * x;
  67   x = c  * m1 * y  * k1; // 1 0 1 0
  68   g += 0.6510 * x;
  69   b += 0.3137 * x;
  70   x = c  * m1 * y  * k;  // 1 0 1 1
  71   g += 0.0745 * x;
  72   x = c  * m  * y1 * k1; // 1 1 0 0
  73   r += 0.1804 * x;
  74   g += 0.1922 * x;
  75   b += 0.5725 * x;
  76   x = c  * m  * y1 * k;  // 1 1 0 1
  77   b += 0.0078 * x;
  78   x = c  * m  * y  * k1; // 1 1 1 0
  79   r += 0.2118 * x;
  80   g += 0.2119 * x;
  81   b += 0.2235 * x;
  82 }