/usr/include/tachyon/pngfile.h is in libtachyon-dev 0.99~b2+dfsg-0.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | /*
* pngfile.h - This file deals with PNG format image files (reading/writing)
*
* $Id: pngfile.h,v 1.2 2011/01/13 04:04:38 johns Exp $
*/
int readpng(const char *name, int *xres, int *yres, unsigned char **imgdata);
int writepng(const char *name, int xres, int yres, unsigned char *imgdata);
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