This file is indexed.

/usr/include/bart/misc/png.h is in libbart-dev 0.4.02-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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extern int png_write_rgb24(const char* name, unsigned int w, unsigned int h, long inum, const unsigned char* buf);
extern int png_write_rgb32(const char* name, unsigned int w, unsigned int h, long inum, const unsigned char* buf);
extern int png_write_bgr24(const char* name, unsigned int w, unsigned int h, long inum, const unsigned char* buf);
extern int png_write_bgr32(const char* name, unsigned int w, unsigned int h, long inum, const unsigned char* buf);