/usr/include/astrometry/cairoutils.h is in libastrometry-dev 0.70+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of the Astrometry.net suite.
# Licensed under a 3-clause BSD style license - see LICENSE
*/
#ifndef CAIRO_UTILS_H
#define CAIRO_UTILS_H
#include <stdio.h>
#include <cairo.h>
/**
A cairo_write_func_t for use with, eg, cairo_pdf_surface_create_for_stream.
The "closure" arg must be a FILE*.
*/
cairo_status_t cairoutils_file_write_func(void *closure,
const unsigned char *data,
unsigned int length);
/**
Reports any cairo error for the given surface. Returns 0 for ok, -1 on error.
*/
int cairoutils_surface_status_errors(cairo_surface_t* surf);
int cairoutils_cairo_status_errors(cairo_t* c);
void cairoutils_draw_path(cairo_t* c, const double* xy, int N);
void cairoutils_argb32_to_rgba(unsigned char* img, int W, int H);
void cairoutils_argb32_to_rgba_2(const unsigned char* inimg,
unsigned char* outimg, int W, int H);
void cairoutils_argb32_to_rgba_flip(const unsigned char* inimg,
unsigned char* outimg, int W, int H);
void cairoutils_rgba_to_argb32(unsigned char* img, int W, int H);
void cairoutils_rgba_to_argb32_2(const unsigned char* inimg,
unsigned char* outimg, int W, int H);
void cairoutils_rgba_to_argb32_flip(const unsigned char* inimg,
unsigned char* outimg, int W, int H);
void cairoutils_premultiply_alpha_rgba(unsigned char* img, int W, int H);
/**
All the following cairoutils_read_* function return a newly-allocated image buffer
of size W * H * 4, containing R,G,B, and alpha.
*/
unsigned char* cairoutils_read_png_stream(FILE* fid, int* pW, int *pH);
unsigned char* cairoutils_read_jpeg_stream(FILE* fid, int* pW, int* pH);
unsigned char* cairoutils_read_png(const char* fn, int* pW, int *pH);
unsigned char* cairoutils_read_jpeg(const char* fn, int* pW, int* pH);
void cairoutils_fake_ppm_init(void);
// You must call ppm_init() or (preferably) cairoutils_fake_ppm_init()
unsigned char* cairoutils_read_ppm(const char* infn, int* pW, int* pH);
unsigned char* cairoutils_read_ppm_stream(FILE* fid, int* pW, int* pH);
int cairoutils_write_ppm(const char* outfn, unsigned char* img, int W, int H);
int cairoutils_write_png(const char* outfn, unsigned char* img, int W, int H);
int cairoutils_write_jpeg(const char* outfn, unsigned char* img, int W, int H);
int cairoutils_stream_ppm(FILE* fout, unsigned char* img, int W, int H);
int cairoutils_stream_png(FILE* fout, unsigned char* img, int W, int H);
int cairoutils_stream_jpeg(FILE* fout, unsigned char* img, int W, int H);
int cairoutils_parse_color(const char* color, float* r, float* g, float* b);
// Parses a space-separated list of floating-point rgb(a) values.
// Parses alpha if "a" is non-null and str contains four terms.
int cairoutils_parse_rgba(const char* str, float* r, float* g, float* b, float* a);
const char* cairoutils_get_color_name(int i);
int cairoutils_parse_marker(const char* name);
#define CAIROUTIL_MARKER_CIRCLE 0
#define CAIROUTIL_MARKER_CROSSHAIR 1
#define CAIROUTIL_MARKER_SQUARE 2
#define CAIROUTIL_MARKER_DIAMOND 3
#define CAIROUTIL_MARKER_X 4
#define CAIROUTIL_MARKER_XCROSSHAIR 5
void cairoutils_draw_marker(cairo_t* cairo, int id, double x, double y, double radius);
const char* cairoutils_get_marker_name(int i);
void cairoutils_print_color_names(const char* prefix);
void cairoutils_print_marker_names(const char* prefix);
#endif
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