/usr/include/poppler/splash/SplashScreen.h is in libpoppler-private-dev 0.62.0-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// SplashScreen.h
//
//========================================================================
//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2009 Albert Astals Cid <aacid@kde.org>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================
#ifndef SPLASHSCREEN_H
#define SPLASHSCREEN_H
#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif
#include "SplashTypes.h"
#include <stdlib.h>
//------------------------------------------------------------------------
// SplashScreen
//------------------------------------------------------------------------
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;
if (mat == NULL) createMatrix();
xx = x & sizeM1;
yy = y & sizeM1;
return value < mat[(yy << log2Size) + xx] ? 0 : 1;
}
// 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) { if (mat == NULL) createMatrix(); return value < minVal || value >= maxVal; }
private:
void createMatrix();
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);
SplashScreenParams *screenParams; // params to create the other members
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
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