arospdf/splash/SplashScreen.h

   1 //========================================================================
   2 //
   3 // SplashScreen.h
   4 //
   5 //========================================================================
   6
   7 #ifndef SPLASHSCREEN_H
   8 #define SPLASHSCREEN_H
   9
  10 #include <aconf.h>
  11
  12 #ifdef USE_GCC_PRAGMAS
  13 #pragma interface
  14 #endif
  15
  16 #include "SplashTypes.h"
  17
  18 //------------------------------------------------------------------------
  19 // SplashScreen
  20 //------------------------------------------------------------------------
  21
  22 class SplashScreen {
  23 public:
  24
  25   SplashScreen(SplashScreenParams *params);
  26   SplashScreen(SplashScreen *screen);
  27   ~SplashScreen();
  28
  29   SplashScreen *copy() { return new SplashScreen(this); }
  30
  31   // Return the computed pixel value (0=black, 1=white) for the gray
  32   // level <value> at (<x>, <y>).
  33   int test(int x, int y, Guchar value);
  34
  35   // Returns true if value is above the white threshold or below the
  36   // black threshold, i.e., if the corresponding halftone will be
  37   // solid white or black.
  38   GBool isStatic(Guchar value);
  39
  40 private:
  41
  42   void buildDispersedMatrix(int i, int j, int val,
  43                             int delta, int offset);
  44   void buildClusteredMatrix();
  45   int distance(int x0, int y0, int x1, int y1);
  46   void buildSCDMatrix(int r);
  47
  48   Guchar *mat;                  // threshold matrix
  49   int size;                     // size of the threshold matrix
  50   Guchar minVal;                // any pixel value below minVal generates
  51                                 //   solid black
  52   Guchar maxVal;                // any pixel value above maxVal generates
  53                                 //   solid white
  54 };
  55
  56 #endif