/usr/include/poppler/goo/PNGWriter.h is in libpoppler-dev 0.18.4-1ubuntu3.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// PNGWriter.h
//
// This file is licensed under the GPLv2 or later
//
// Copyright (C) 2009 Warren Toomey <wkt@tuhs.org>
// Copyright (C) 2009 Shen Liang <shenzhuxi@gmail.com>
// Copyright (C) 2009, 2011 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2009 Stefan Thomas <thomas@eload24.com>
// Copyright (C) 2010, 2011 Adrian Johnson <ajohnson@redneon.com>
//
//========================================================================
#ifndef PNGWRITER_H
#define PNGWRITER_H
#include "poppler/poppler-config.h"
#ifdef ENABLE_LIBPNG
#include <cstdio>
#include <png.h>
#include "ImgWriter.h"
class PNGWriter : public ImgWriter
{
public:
/* RGB - 3 bytes/pixel
* RGBA - 4 bytes/pixel
* GRAY - 1 byte/pixel
* MONOCHROME - 1 byte/pixel. PNGWriter will bitpack to 8 pixels/byte
*/
enum Format { RGB, RGBA, GRAY, MONOCHROME };
PNGWriter(Format format = RGB);
~PNGWriter();
void setICCProfile(const char *name, unsigned char *data, int size);
void setSRGBProfile();
bool init(FILE *f, int width, int height, int hDPI, int vDPI);
bool writePointers(unsigned char **rowPointers, int rowCount);
bool writeRow(unsigned char **row);
bool close();
private:
Format format;
png_structp png_ptr;
png_infop info_ptr;
unsigned char *icc_data;
int icc_data_size;
char *icc_name;
bool sRGB_profile;
};
#endif
#endif
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