//========================================================================

//

// SplashScreen.h

//

// Copyright 2003-2013 Glyph & Cog, LLC

//

//========================================================================

#ifndef SPLASHSCREEN_H

#define SPLASHSCREEN_H

#include <aconf.h>

#ifdef USE_GCC_PRAGMAS

#pragma interface

#endif

#include "SplashTypes.h"

//------------------------------------------------------------------------

// SplashScreen

//------------------------------------------------------------------------

typedef Guchar *SplashScreenCursor;

class SplashScreen {

public:

  SplashScreen(SplashScreenParams *params);

  SplashScreen(SplashScreen *screen);

  ~SplashScreen();

  SplashScreen *copy() { return new SplashScreen(this); }

  // Return the computed pixel value (0=black, 1=white) for the gray

  // level <value> at (<x>, <y>).

  int test(int x, int y, Guchar value) {

    int xx, yy;

    xx = x & sizeM1;

    yy = y & sizeM1;

    return value < mat[(yy << log2Size) + xx] ? 0 : 1;

  }

  // To do a series of tests with the same y value, call

  // getTestCursor(y), and then call testWithCursor(cursor, x, value)

  // for each x.

  SplashScreenCursor getTestCursor(int y) {

    int yy;

    yy = y & sizeM1;

    return &mat[yy << log2Size];

  }

  int testWithCursor(SplashScreenCursor cursor, int x, Guchar value) {

    int xx = x & sizeM1;

    return value >= cursor[xx];

  }

  // Returns true if value is above the white threshold or below the

  // black threshold, i.e., if the corresponding halftone will be

  // solid white or black.

  GBool isStatic(Guchar value) { return value < minVal || value >= maxVal; }

private:

  void buildDispersedMatrix(int i, int j, int val,

          int delta, int offset);

  void buildClusteredMatrix();

  int distance(int x0, int y0, int x1, int y1);

  void buildSCDMatrix(int r);

  Guchar *mat;      // threshold matrix

  int size;     // size of the threshold matrix

  int sizeM1;     // size - 1

  int log2Size;     // log2(size)

  Guchar minVal;    // any pixel value below minVal generates

        //   solid black

  Guchar maxVal;    // any pixel value above maxVal generates

        //   solid white

};

#endif