/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/rb_cairo.h is in ruby-cairo 1.10.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* Ruby Cairo Binding
*
* $Author: kou $
* $Date: 2008-09-19 12:56:27 $
*
* Copyright 2006-2008 Kouhei Sutou <kou@cozmixng.org>
* Copyright 2005 Øyvind Kolås <pippin@freedesktop.org>
* Copyright 2004-2005 MenTaLguY <mental@rydia.com>
*
* This file is made available under the same terms as Ruby
*
*/
#ifndef RB_CAIRO_H
#define RB_CAIRO_H
#include <cairo.h>
#ifdef CAIRO_HAS_PS_SURFACE
# include <cairo-ps.h>
#endif
#ifdef CAIRO_HAS_PDF_SURFACE
# include <cairo-pdf.h>
#endif
#ifdef CAIRO_HAS_SVG_SURFACE
# include <cairo-svg.h>
#endif
#ifdef CAIRO_HAS_SCRIPT_SURFACE
# include <cairo-script.h>
#endif
#define CAIRO_CHECK_VERSION(major, minor, micro) \
(CAIRO_VERSION_MAJOR > (major) || \
(CAIRO_VERSION_MAJOR == (major) && CAIRO_VERSION_MINOR > (minor)) || \
(CAIRO_VERSION_MAJOR == (major) && CAIRO_VERSION_MINOR == (minor) && \
CAIRO_VERSION_MICRO >= (micro)))
#include "ruby.h"
#if defined(__cplusplus)
# define RB_CAIRO_BEGIN_DECLS extern "C" {
# define RB_CAIRO_END_DECLS }
#else
# define RB_CAIRO_BEGIN_DECLS
# define RB_CAIRO_END_DECLS
#endif
RB_CAIRO_BEGIN_DECLS
#if defined(RUBY_CAIRO_PLATFORM_WIN32) && !defined(RB_CAIRO_PLATFORM_WIN32)
# define RB_CAIRO_PLATFORM_WIN32 RUBY_CAIRO_PLATFORM_WIN32
#endif
#if defined(RUBY_CAIRO_STATIC_COMPILATION) && !defined(RB_CAIRO_STATIC_COMPILATION)
# define RB_CAIRO_STATIC_COMPILATION RUBY_CAIRO_STATIC_COMPILATION
#endif
#if defined(RB_CAIRO_PLATFORM_WIN32) && !defined(RB_CAIRO_STATIC_COMPILATION)
# ifdef RB_CAIRO_COMPILATION
# define RB_CAIRO_VAR __declspec(dllexport)
# else
# define RB_CAIRO_VAR extern __declspec(dllimport)
# endif
#else
# define RB_CAIRO_VAR extern
#endif
#define RB_CAIRO_VERSION_MAJOR 1
#define RB_CAIRO_VERSION_MINOR 10
#define RB_CAIRO_VERSION_MICRO 1
RB_CAIRO_VAR VALUE rb_mCairo;
RB_CAIRO_VAR VALUE rb_cCairo_Context;
RB_CAIRO_VAR VALUE rb_cCairo_Point;
RB_CAIRO_VAR VALUE rb_cCairo_Path;
RB_CAIRO_VAR VALUE rb_cCairo_PathData;
RB_CAIRO_VAR VALUE rb_cCairo_PathMoveTo;
RB_CAIRO_VAR VALUE rb_cCairo_PathLineTo;
RB_CAIRO_VAR VALUE rb_cCairo_PathCurveTo;
RB_CAIRO_VAR VALUE rb_cCairo_PathClosePath;
RB_CAIRO_VAR VALUE rb_cCairo_Matrix;
RB_CAIRO_VAR VALUE rb_cCairo_Region;
RB_CAIRO_VAR VALUE rb_cCairo_Pattern;
RB_CAIRO_VAR VALUE rb_cCairo_SolidPattern;
RB_CAIRO_VAR VALUE rb_cCairo_SurfacePattern;
RB_CAIRO_VAR VALUE rb_cCairo_GradientPattern;
RB_CAIRO_VAR VALUE rb_cCairo_LinearPattern;
RB_CAIRO_VAR VALUE rb_cCairo_RadialPattern;
RB_CAIRO_VAR VALUE rb_cCairo_FontFace;
RB_CAIRO_VAR VALUE rb_cCairo_ToyFontFace;
RB_CAIRO_VAR VALUE rb_cCairo_UserFontFace;
RB_CAIRO_VAR VALUE rb_cCairo_UserFontFace_TextToGlyphsData;
RB_CAIRO_VAR VALUE rb_cCairo_FontExtents;
RB_CAIRO_VAR VALUE rb_cCairo_FontOptions;
RB_CAIRO_VAR VALUE rb_cCairo_ScaledFont;
RB_CAIRO_VAR VALUE rb_cCairo_TextExtents;
RB_CAIRO_VAR VALUE rb_cCairo_Glyph;
RB_CAIRO_VAR VALUE rb_cCairo_Surface;
RB_CAIRO_VAR VALUE rb_cCairo_ImageSurface;
RB_CAIRO_VAR VALUE rb_cCairo_PDFSurface;
RB_CAIRO_VAR VALUE rb_cCairo_PSSurface;
RB_CAIRO_VAR VALUE rb_cCairo_SVGSurface;
RB_CAIRO_VAR VALUE rb_cCairo_Win32Surface;
RB_CAIRO_VAR VALUE rb_cCairo_Win32PrintingSurface;
/* For backward compatibility*/
#define rb_cCairo_WIN32Surface rb_cCairo_Win32Surface
RB_CAIRO_VAR VALUE rb_cCairo_QuartzSurface;
RB_CAIRO_VAR VALUE rb_cCairo_QuartzImageSurface;
RB_CAIRO_VAR VALUE rb_cCairo_ScriptSurface;
RB_CAIRO_VAR VALUE rb_cCairo_QtSurface;
RB_CAIRO_VAR VALUE rb_cCairo_RecordingSurface;
RB_CAIRO_VAR VALUE rb_cCairo_VGSurface;
RB_CAIRO_VAR VALUE rb_cCairo_GLSurface;
RB_CAIRO_VAR VALUE rb_cCairo_GLTextureSurface;
RB_CAIRO_VAR VALUE rb_cCairo_DRMSurface;
RB_CAIRO_VAR VALUE rb_cCairo_TeeSurface;
RB_CAIRO_VAR VALUE rb_cCairo_XMLSurface;
RB_CAIRO_VAR VALUE rb_cCairo_SkiaSurface;
RB_CAIRO_VAR VALUE rb_cCairo_SubSurface;
RB_CAIRO_VAR VALUE rb_cCairo_Device;
RB_CAIRO_VAR VALUE rb_cCairo_DRMDevice;
RB_CAIRO_VAR VALUE rb_cCairo_GLDevice;
RB_CAIRO_VAR VALUE rb_cCairo_ScriptDevice;
RB_CAIRO_VAR VALUE rb_cCairo_XCBDevice;
RB_CAIRO_VAR VALUE rb_cCairo_XlibtDevice;
RB_CAIRO_VAR VALUE rb_cCairo_XMLDevice;
RB_CAIRO_VAR VALUE rb_mCairo_Operator;
RB_CAIRO_VAR VALUE rb_mCairo_Antialias;
RB_CAIRO_VAR VALUE rb_mCairo_FillRule;
RB_CAIRO_VAR VALUE rb_mCairo_LineCap;
RB_CAIRO_VAR VALUE rb_mCairo_LineJoin;
RB_CAIRO_VAR VALUE rb_mCairo_FontSlant;
RB_CAIRO_VAR VALUE rb_mCairo_FontWeight;
RB_CAIRO_VAR VALUE rb_mCairo_SubpixelOrder;
RB_CAIRO_VAR VALUE rb_mCairo_HintStyle;
RB_CAIRO_VAR VALUE rb_mCairo_HintMetrics;
RB_CAIRO_VAR VALUE rb_mCairo_FontType;
RB_CAIRO_VAR VALUE rb_mCairo_PathDataType;
RB_CAIRO_VAR VALUE rb_mCairo_Content;
RB_CAIRO_VAR VALUE rb_mCairo_SurfaceType;
RB_CAIRO_VAR VALUE rb_mCairo_Format;
RB_CAIRO_VAR VALUE rb_mCairo_PatternType;
RB_CAIRO_VAR VALUE rb_mCairo_Extend;
RB_CAIRO_VAR VALUE rb_mCairo_Filter;
RB_CAIRO_VAR VALUE rb_mCairo_SVGVersion;
RB_CAIRO_VAR VALUE rb_mCairo_PSLevel;
RB_CAIRO_VAR VALUE rb_mCairo_PDFVersion;
RB_CAIRO_VAR VALUE rb_mCairo_SVGVersion;
RB_CAIRO_VAR VALUE rb_mCairo_TextClusterFlag;
RB_CAIRO_VAR VALUE rb_mCairo_ScriptMode;
RB_CAIRO_VAR VALUE rb_mCairo_MimeType;
RB_CAIRO_VAR VALUE rb_mCairo_RegionOverlap;
RB_CAIRO_VAR VALUE rb_mCairo_Color;
RB_CAIRO_VAR VALUE rb_cCairo_Color_Base;
RB_CAIRO_VAR VALUE rb_cCairo_Paper;
#define RVAL2CRCONTEXT(obj) (rb_cairo_context_from_ruby_object(obj))
#define CRCONTEXT2RVAL(cr) (rb_cairo_context_to_ruby_object(cr))
#define RVAL2CRPATH(obj) (rb_cairo_path_from_ruby_object(obj))
#define CRPATH2RVAL(path) (rb_cairo_path_to_ruby_object(path))
#define RVAL2CRMATRIX(obj) (rb_cairo_matrix_from_ruby_object(obj))
#define CRMATRIX2RVAL(matrix) (rb_cairo_matrix_to_ruby_object(matrix))
#define RVAL2CRREGION(obj) (rb_cairo_region_from_ruby_object(obj))
#define CRREGION2RVAL(region) (rb_cairo_region_to_ruby_object(region))
#define RVAL2CRPATTERN(obj) (rb_cairo_pattern_from_ruby_object(obj))
#define CRPATTERN2RVAL(pattern) (rb_cairo_pattern_to_ruby_object(pattern))
#define RVAL2CRFONTFACE(obj) (rb_cairo_font_face_from_ruby_object(obj))
#define CRFONTFACE2RVAL(face) (rb_cairo_font_face_to_ruby_object(face))
#define RVAL2CRFONTEXTENTS(obj) (rb_cairo_font_extents_from_ruby_object(obj))
#define CRFONTEXTENTS2RVAL(ext) (rb_cairo_font_extents_to_ruby_object(ext))
#define RVAL2CRFONTOPTIONS(obj) (rb_cairo_font_options_from_ruby_object(obj))
#define CRFONTOPTIONS2RVAL(opt) (rb_cairo_font_options_to_ruby_object(opt))
#define RVAL2CRSCALEDFONT(obj) (rb_cairo_scaled_font_from_ruby_object(obj))
#define CRSCALEDFONT2RVAL(font) (rb_cairo_scaled_font_to_ruby_object(font))
#define RVAL2CRTEXTEXTENTS(obj) (rb_cairo_text_extents_from_ruby_object(obj))
#define CRTEXTEXTENTS2RVAL(ext) (rb_cairo_text_extents_to_ruby_object(ext))
#define RVAL2CRGLYPH(obj) (rb_cairo_glyph_from_ruby_object(obj))
#define CRGLYPH2RVAL(glyph) (rb_cairo_glyph_to_ruby_object(glyph))
#define RVAL2CRTEXTCLUSTER(obj) (rb_cairo_text_cluster_from_ruby_object(obj))
#define CRTEXTCLUSTER2RVAL(cluster) (rb_cairo_text_cluster_to_ruby_object(cluster))
#define RVAL2CRSURFACE(obj) (rb_cairo_surface_from_ruby_object(obj))
#define CRSURFACE2RVAL(surface) (rb_cairo_surface_to_ruby_object(surface))
#define CRSURFACE2RVAL_WITH_DESTROY(surface) \
(rb_cairo_surface_to_ruby_object_with_destroy(surface))
#define RVAL2CRDEVICE(obj) (rb_cairo_device_from_ruby_object(obj))
#define CRDEVICE2RVAL(device) (rb_cairo_device_to_ruby_object(device))
cairo_t *rb_cairo_context_from_ruby_object (VALUE obj);
VALUE rb_cairo_context_to_ruby_object (cairo_t *cr);
cairo_path_t *rb_cairo_path_from_ruby_object (VALUE obj);
VALUE rb_cairo_path_to_ruby_object (cairo_path_t *path);
cairo_matrix_t *rb_cairo_matrix_from_ruby_object (VALUE obj);
VALUE rb_cairo_matrix_to_ruby_object (cairo_matrix_t *matrix);
#if CAIRO_CHECK_VERSION(1, 10, 0)
cairo_region_t *rb_cairo_region_from_ruby_object (VALUE obj);
VALUE rb_cairo_region_to_ruby_object (cairo_region_t *region);
#endif
cairo_pattern_t *rb_cairo_pattern_from_ruby_object (VALUE obj);
VALUE rb_cairo_pattern_to_ruby_object (cairo_pattern_t *pat);
cairo_font_face_t *rb_cairo_font_face_from_ruby_object (VALUE obj);
VALUE rb_cairo_font_face_to_ruby_object (cairo_font_face_t *face);
cairo_font_extents_t *rb_cairo_font_extents_from_ruby_object (VALUE obj);
VALUE rb_cairo_font_extents_to_ruby_object (cairo_font_extents_t *extents);
cairo_font_options_t *rb_cairo_font_options_from_ruby_object (VALUE obj);
VALUE rb_cairo_font_options_to_ruby_object (cairo_font_options_t *options);
cairo_scaled_font_t *rb_cairo_scaled_font_from_ruby_object (VALUE obj);
VALUE rb_cairo_scaled_font_to_ruby_object (cairo_scaled_font_t *options);
cairo_text_extents_t *rb_cairo_text_extents_from_ruby_object (VALUE obj);
VALUE rb_cairo_text_extents_to_ruby_object (cairo_text_extents_t *extents);
cairo_glyph_t *rb_cairo_glyph_from_ruby_object (VALUE obj);
VALUE rb_cairo_glyph_to_ruby_object (cairo_glyph_t *glyph);
#if CAIRO_CHECK_VERSION(1, 7, 2)
cairo_text_cluster_t *rb_cairo_text_cluster_from_ruby_object (VALUE obj);
VALUE rb_cairo_text_cluster_to_ruby_object (cairo_text_cluster_t *cluster);
#endif
cairo_surface_t *rb_cairo_surface_from_ruby_object (VALUE obj);
VALUE rb_cairo_surface_to_ruby_object (cairo_surface_t *surface);
VALUE rb_cairo_surface_to_ruby_object_with_destroy
(cairo_surface_t *surface);
#if CAIRO_CHECK_VERSION(1, 10, 0)
cairo_device_t *rb_cairo_device_from_ruby_object (VALUE obj);
VALUE rb_cairo_device_to_ruby_object (cairo_device_t *device);
#endif
#define RVAL2CROPERATOR(obj) (rb_cairo_operator_from_ruby_object(obj))
#define RVAL2CRANTIALIAS(obj) (rb_cairo_antialias_from_ruby_object(obj))
#define RVAL2CRFILLRULE(obj) (rb_cairo_fill_rule_from_ruby_object(obj))
#define RVAL2CRLINECAP(obj) (rb_cairo_line_cap_from_ruby_object(obj))
#define RVAL2CRLINEJOIN(obj) (rb_cairo_line_join_from_ruby_object(obj))
#define RVAL2CRFONTSLANT(obj) (rb_cairo_font_slant_from_ruby_object(obj))
#define RVAL2CRFONTWEIGHT(obj) (rb_cairo_font_weight_from_ruby_object(obj))
#define RVAL2CRSUBPIXELORDER(obj) (rb_cairo_subpixel_order_from_ruby_object(obj))
#define RVAL2CRHINTSTYLE(obj) (rb_cairo_hint_style_from_ruby_object(obj))
#define RVAL2CRHINTMETRICS(obj) (rb_cairo_hint_metrics_from_ruby_object(obj))
#define RVAL2CRPATHDATATYPE(obj) (rb_cairo_path_data_type_from_ruby_object(obj))
#define RVAL2CRCONTENT(obj) (rb_cairo_content_from_ruby_object(obj))
#define RVAL2CRFORMAT(obj) (rb_cairo_format_from_ruby_object(obj))
#define RVAL2CREXTEND(obj) (rb_cairo_extend_from_ruby_object(obj))
#define RVAL2CRFILTER(obj) (rb_cairo_filter_from_ruby_object(obj))
#ifdef CAIRO_HAS_SVG_SURFACE
#define RVAL2CRSVGVERSION(obj) (rb_cairo_svg_version_from_ruby_object(obj))
#endif
#ifdef CAIRO_HAS_PS_SURFACE
# if CAIRO_CHECK_VERSION(1, 5, 2)
#define RVAL2CRPSLEVEL(obj) (rb_cairo_ps_level_from_ruby_object(obj))
# endif
#endif
#ifdef CAIRO_HAS_PDF_SURFACE
# if CAIRO_CHECK_VERSION(1, 10, 0)
#define RVAL2CRPDFVERSION(obj) (rb_cairo_pdf_version_from_ruby_object(obj))
# endif
#endif
#if CAIRO_CHECK_VERSION(1, 7, 6)
#define RVAL2CRTEXTCLUSTERFLAGS(obj) (rb_cairo_text_cluster_flags_from_ruby_object(obj))
#endif
#ifdef CAIRO_HAS_SCRIPT_SURFACE
#define RVAL2CRSCRIPTMODE(obj) (rb_cairo_script_mode_from_ruby_object(obj))
#endif
#if CAIRO_CHECK_VERSION(1, 10, 0)
#define RVAL2CRREGIONOVERLAP(obj) (rb_cairo_region_overalap_from_ruby_object(obj))
#endif
cairo_operator_t rb_cairo_operator_from_ruby_object (VALUE obj);
cairo_antialias_t rb_cairo_antialias_from_ruby_object (VALUE obj);
cairo_fill_rule_t rb_cairo_fill_rule_from_ruby_object (VALUE obj);
cairo_line_cap_t rb_cairo_line_cap_from_ruby_object (VALUE obj);
cairo_line_join_t rb_cairo_line_join_from_ruby_object (VALUE obj);
cairo_font_slant_t rb_cairo_font_slant_from_ruby_object (VALUE obj);
cairo_font_weight_t rb_cairo_font_weight_from_ruby_object (VALUE obj);
cairo_subpixel_order_t rb_cairo_subpixel_order_from_ruby_object (VALUE obj);
cairo_hint_style_t rb_cairo_hint_style_from_ruby_object (VALUE obj);
cairo_hint_metrics_t rb_cairo_hint_metrics_from_ruby_object (VALUE obj);
cairo_path_data_type_t rb_cairo_path_data_type_from_ruby_object (VALUE obj);
cairo_content_t rb_cairo_content_from_ruby_object (VALUE obj);
cairo_format_t rb_cairo_format_from_ruby_object (VALUE obj);
cairo_extend_t rb_cairo_extend_from_ruby_object (VALUE obj);
cairo_filter_t rb_cairo_filter_from_ruby_object (VALUE obj);
#ifdef CAIRO_HAS_SVG_SURFACE
cairo_svg_version_t rb_cairo_svg_version_from_ruby_object (VALUE obj);
#endif
#ifdef CAIRO_HAS_PS_SURFACE
# if CAIRO_CHECK_VERSION(1, 5, 2)
cairo_ps_level_t rb_cairo_ps_level_from_ruby_object (VALUE obj);
# endif
#endif
#ifdef CAIRO_HAS_PDF_SURFACE
# if CAIRO_CHECK_VERSION(1, 10, 0)
cairo_pdf_version_t rb_cairo_pdf_version_from_ruby_object (VALUE obj);
# endif
#endif
#if CAIRO_CHECK_VERSION(1, 7, 6)
cairo_text_cluster_flags_t rb_cairo_text_cluster_flags_from_ruby_object (VALUE obj);
#endif
#ifdef CAIRO_HAS_SCRIPT_SURFACE
cairo_script_mode_t rb_cairo_script_mode_from_ruby_object (VALUE obj);
#endif
#if CAIRO_CHECK_VERSION(1, 10, 0)
cairo_region_overlap_t rb_cairo_region_overlap_from_ruby_object(VALUE obj);
#endif
void rb_cairo_check_status (cairo_status_t status);
#define RB_CAIRO_DEF_SETTERS(klass) rb_cairo_def_setters(klass);
void rb_cairo_def_setters (VALUE klass);
RB_CAIRO_END_DECLS
#endif
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