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 /* cairo - a vector graphics library with display and print output
  *
  * Copyright © 2002 University of Southern California
  * Copyright © 2005 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it either under the terms of the GNU Lesser General Public
  * License version 2.1 as published by the Free Software Foundation
  * (the "LGPL") or, at your option, under the terms of the Mozilla
  * Public License Version 1.1 (the "MPL"). If you do not alter this
  * notice, a recipient may use your version of this file under either
  * the MPL or the LGPL.
  *
  * You should have received a copy of the LGPL along with this library
  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
  * You should have received a copy of the MPL along with this library
  * in the file COPYING-MPL-1.1
  *
  * The contents of this file are subject to the Mozilla Public License
  * Version 1.1 (the "License"); you may not use this file except in
  * compliance with the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
  *
  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
  * the specific language governing rights and limitations.
  *
  * The Original Code is the cairo graphics library.
  *
  * The Initial Developer of the Original Code is University of Southern
  * California.
  *
  * Contributor(s):
  *  Carl D. Worth <cworth@cworth.org>
  */
 
 #ifndef CAIRO_H
 #define CAIRO_H
 
 #include "cairo-version.h"
 #include "cairo-features.h"
 #include "cairo-deprecated.h"
 
 #ifdef  __cplusplus
 # define CAIRO_BEGIN_DECLS  extern "C" {
 # define CAIRO_END_DECLS    }
 #else
 # define CAIRO_BEGIN_DECLS
 # define CAIRO_END_DECLS
 #endif
 
 #if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(CAIRO_WIN32_STATIC_BUILD)
 # define _cairo_export __declspec(dllexport)
 # define _cairo_import __declspec(dllimport)
 #elif defined(__GNUC__) && (__GNUC__ >= 4)
 # define _cairo_export __attribute__((__visibility__("default")))
 # define _cairo_import
 #else
 # define _cairo_export
 # define _cairo_import
 #endif
 
 #ifdef CAIRO_COMPILATION
 # define _cairo_api _cairo_export
 #else
 # define _cairo_api _cairo_import
 #endif
 
 #define cairo_public _cairo_api extern
 
 CAIRO_BEGIN_DECLS
 
 #define CAIRO_VERSION_ENCODE(major, minor, micro) ( \
       ((major) * 10000)             \
     + ((minor) *   100)             \
     + ((micro) *     1))
 
 #define CAIRO_VERSION CAIRO_VERSION_ENCODE( \
     CAIRO_VERSION_MAJOR,            \
     CAIRO_VERSION_MINOR,            \
     CAIRO_VERSION_MICRO)
 
 
 #define CAIRO_VERSION_STRINGIZE_(major, minor, micro)   \
     #major"."#minor"."#micro
 #define CAIRO_VERSION_STRINGIZE(major, minor, micro)    \
     CAIRO_VERSION_STRINGIZE_(major, minor, micro)
 
 #define CAIRO_VERSION_STRING CAIRO_VERSION_STRINGIZE(   \
     CAIRO_VERSION_MAJOR,                \
     CAIRO_VERSION_MINOR,                \
     CAIRO_VERSION_MICRO)
 
 
 cairo_public int
 cairo_version (void);
 
 cairo_public const char*
 cairo_version_string (void);
 
 /**
  * cairo_bool_t:
  *
  * #cairo_bool_t is used for boolean values. Returns of type
  * #cairo_bool_t will always be either 0 or 1, but testing against
  * these values explicitly is not encouraged; just use the
  * value as a boolean condition.
  *
  * <informalexample><programlisting>
  *  if (cairo_in_stroke (cr, x, y)) {
  *      /<!-- -->* do something *<!-- -->/
  *  }
  * </programlisting></informalexample>
  *
  * Since: 1.0
  **/
 typedef int cairo_bool_t;
 
 /**
  * cairo_t:
  *
  * A #cairo_t contains the current state of the rendering device,
  * including coordinates of yet to be drawn shapes.
  *
  * Cairo contexts, as #cairo_t objects are named, are central to
  * cairo and all drawing with cairo is always done to a #cairo_t
  * object.
  *
  * Memory management of #cairo_t is done with
  * cairo_reference() and cairo_destroy().
  *
  * Since: 1.0
  **/
 typedef struct _cairo cairo_t;
 
 /**
  * cairo_surface_t:
  *
  * A #cairo_surface_t represents an image, either as the destination
  * of a drawing operation or as source when drawing onto another
  * surface.  To draw to a #cairo_surface_t, create a cairo context
  * with the surface as the target, using cairo_create().
  *
  * There are different subtypes of #cairo_surface_t for
  * different drawing backends; for example, cairo_image_surface_create()
  * creates a bitmap image in memory.
  * The type of a surface can be queried with cairo_surface_get_type().
  *
  * The initial contents of a surface after creation depend upon the manner
  * of its creation. If cairo creates the surface and backing storage for
  * the user, it will be initially cleared; for example,
  * cairo_image_surface_create() and cairo_surface_create_similar().
  * Alternatively, if the user passes in a reference to some backing storage
  * and asks cairo to wrap that in a #cairo_surface_t, then the contents are
  * not modified; for example, cairo_image_surface_create_for_data() and
  * cairo_xlib_surface_create().
  *
  * Memory management of #cairo_surface_t is done with
  * cairo_surface_reference() and cairo_surface_destroy().
  *
  * Since: 1.0
  **/
 typedef struct _cairo_surface cairo_surface_t;
 
 /**
  * cairo_device_t:
  *
  * A #cairo_device_t represents the driver interface for drawing
  * operations to a #cairo_surface_t.  There are different subtypes of
  * #cairo_device_t for different drawing backends.
  *
  * The type of a device can be queried with cairo_device_get_type().
  *
  * Memory management of #cairo_device_t is done with
  * cairo_device_reference() and cairo_device_destroy().
  *
  * Since: 1.10
  **/
 typedef struct _cairo_device cairo_device_t;
 
 /**
  * cairo_matrix_t:
  * @xx: xx component of the affine transformation
  * @yx: yx component of the affine transformation
  * @xy: xy component of the affine transformation
  * @yy: yy component of the affine transformation
  * @x0: X translation component of the affine transformation
  * @y0: Y translation component of the affine transformation
  *
  * A #cairo_matrix_t holds an affine transformation, such as a scale,
  * rotation, shear, or a combination of those. The transformation of
  * a point (x, y) is given by:
  * <programlisting>
  *     x_new = xx * x + xy * y + x0;
  *     y_new = yx * x + yy * y + y0;
  * </programlisting>
  *
  * Since: 1.0
  **/
 typedef struct _cairo_matrix {
     double xx; double yx;
     double xy; double yy;
     double x0; double y0;
 } cairo_matrix_t;
 
 /**
  * cairo_pattern_t:
  *
  * A #cairo_pattern_t represents a source when drawing onto a
  * surface. There are different subtypes of #cairo_pattern_t,
  * for different types of sources; for example,
  * cairo_pattern_create_rgb() creates a pattern for a solid
  * opaque color.
  *
  * Other than various
  * <function>cairo_pattern_create_<emphasis>type</emphasis>()</function>
  * functions, some of the pattern types can be implicitly created using various
  * <function>cairo_set_source_<emphasis>type</emphasis>()</function> functions;
  * for example cairo_set_source_rgb().
  *
  * The type of a pattern can be queried with cairo_pattern_get_type().
  *
  * Memory management of #cairo_pattern_t is done with
  * cairo_pattern_reference() and cairo_pattern_destroy().
  *
  * Since: 1.0
  **/
 typedef struct _cairo_pattern cairo_pattern_t;
 
 /**
  * cairo_destroy_func_t:
  * @data: The data element being destroyed.
  *
  * #cairo_destroy_func_t the type of function which is called when a
  * data element is destroyed. It is passed the pointer to the data
  * element and should free any memory and resources allocated for it.
  *
  * Since: 1.0
  **/
 typedef void (*cairo_destroy_func_t) (void *data);
 
 /**
  * cairo_user_data_key_t:
  * @unused: not used; ignore.
  *
  * #cairo_user_data_key_t is used for attaching user data to cairo
  * data structures.  The actual contents of the struct is never used,
  * and there is no need to initialize the object; only the unique
  * address of a #cairo_data_key_t object is used.  Typically, you
  * would just use the address of a static #cairo_data_key_t object.
  *
  * Since: 1.0
  **/
 typedef struct _cairo_user_data_key {
     int unused;
 } cairo_user_data_key_t;
 
 /**
  * cairo_status_t:
  * @CAIRO_STATUS_SUCCESS: no error has occurred (Since 1.0)
  * @CAIRO_STATUS_NO_MEMORY: out of memory (Since 1.0)
  * @CAIRO_STATUS_INVALID_RESTORE: cairo_restore() called without matching cairo_save() (Since 1.0)
  * @CAIRO_STATUS_INVALID_POP_GROUP: no saved group to pop, i.e. cairo_pop_group() without matching cairo_push_group() (Since 1.0)
  * @CAIRO_STATUS_NO_CURRENT_POINT: no current point defined (Since 1.0)
  * @CAIRO_STATUS_INVALID_MATRIX: invalid matrix (not invertible) (Since 1.0)
  * @CAIRO_STATUS_INVALID_STATUS: invalid value for an input #cairo_status_t (Since 1.0)
  * @CAIRO_STATUS_NULL_POINTER: %NULL pointer (Since 1.0)
  * @CAIRO_STATUS_INVALID_STRING: input string not valid UTF-8 (Since 1.0)
  * @CAIRO_STATUS_INVALID_PATH_DATA: input path data not valid (Since 1.0)
  * @CAIRO_STATUS_READ_ERROR: error while reading from input stream (Since 1.0)
  * @CAIRO_STATUS_WRITE_ERROR: error while writing to output stream (Since 1.0)
  * @CAIRO_STATUS_SURFACE_FINISHED: target surface has been finished (Since 1.0)
  * @CAIRO_STATUS_SURFACE_TYPE_MISMATCH: the surface type is not appropriate for the operation (Since 1.0)
  * @CAIRO_STATUS_PATTERN_TYPE_MISMATCH: the pattern type is not appropriate for the operation (Since 1.0)
  * @CAIRO_STATUS_INVALID_CONTENT: invalid value for an input #cairo_content_t (Since 1.0)
  * @CAIRO_STATUS_INVALID_FORMAT: invalid value for an input #cairo_format_t (Since 1.0)
  * @CAIRO_STATUS_INVALID_VISUAL: invalid value for an input Visual* (Since 1.0)
  * @CAIRO_STATUS_FILE_NOT_FOUND: file not found (Since 1.0)
  * @CAIRO_STATUS_INVALID_DASH: invalid value for a dash setting (Since 1.0)
  * @CAIRO_STATUS_INVALID_DSC_COMMENT: invalid value for a DSC comment (Since 1.2)
  * @CAIRO_STATUS_INVALID_INDEX: invalid index passed to getter (Since 1.4)
  * @CAIRO_STATUS_CLIP_NOT_REPRESENTABLE: clip region not representable in desired format (Since 1.4)
  * @CAIRO_STATUS_TEMP_FILE_ERROR: error creating or writing to a temporary file (Since 1.6)
  * @CAIRO_STATUS_INVALID_STRIDE: invalid value for stride (Since 1.6)
  * @CAIRO_STATUS_FONT_TYPE_MISMATCH: the font type is not appropriate for the operation (Since 1.8)
  * @CAIRO_STATUS_USER_FONT_IMMUTABLE: the user-font is immutable (Since 1.8)
  * @CAIRO_STATUS_USER_FONT_ERROR: error occurred in a user-font callback function (Since 1.8)
  * @CAIRO_STATUS_NEGATIVE_COUNT: negative number used where it is not allowed (Since 1.8)
  * @CAIRO_STATUS_INVALID_CLUSTERS: input clusters do not represent the accompanying text and glyph array (Since 1.8)
  * @CAIRO_STATUS_INVALID_SLANT: invalid value for an input #cairo_font_slant_t (Since 1.8)
  * @CAIRO_STATUS_INVALID_WEIGHT: invalid value for an input #cairo_font_weight_t (Since 1.8)
  * @CAIRO_STATUS_INVALID_SIZE: invalid value (typically too big) for the size of the input (surface, pattern, etc.) (Since 1.10)
  * @CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED: user-font method not implemented (Since 1.10)
  * @CAIRO_STATUS_DEVICE_TYPE_MISMATCH: the device type is not appropriate for the operation (Since 1.10)
  * @CAIRO_STATUS_DEVICE_ERROR: an operation to the device caused an unspecified error (Since 1.10)
  * @CAIRO_STATUS_INVALID_MESH_CONSTRUCTION: a mesh pattern
  *   construction operation was used outside of a
  *   cairo_mesh_pattern_begin_patch()/cairo_mesh_pattern_end_patch()
  *   pair (Since 1.12)
  * @CAIRO_STATUS_DEVICE_FINISHED: target device has been finished (Since 1.12)
  * @CAIRO_STATUS_JBIG2_GLOBAL_MISSING: %CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID has been used on at least one image
  *   but no image provided %CAIRO_MIME_TYPE_JBIG2_GLOBAL (Since 1.14)
  * @CAIRO_STATUS_PNG_ERROR: error occurred in libpng while reading from or writing to a PNG file (Since 1.16)
  * @CAIRO_STATUS_FREETYPE_ERROR: error occurred in libfreetype (Since 1.16)
  * @CAIRO_STATUS_WIN32_GDI_ERROR: error occurred in the Windows Graphics Device Interface (Since 1.16)
  * @CAIRO_STATUS_TAG_ERROR: invalid tag name, attributes, or nesting (Since 1.16)
  * @CAIRO_STATUS_DWRITE_ERROR: error occurred in the Windows Direct Write API (Since 1.18)
  * @CAIRO_STATUS_SVG_FONT_ERROR: error occurred in OpenType-SVG font rendering (Since 1.18)
  * @CAIRO_STATUS_LAST_STATUS: this is a special value indicating the number of
  *   status values defined in this enumeration.  When using this value, note
  *   that the version of cairo at run-time may have additional status values
  *   defined than the value of this symbol at compile-time. (Since 1.10)
  *
  * #cairo_status_t is used to indicate errors that can occur when
  * using Cairo. In some cases it is returned directly by functions.
  * but when using #cairo_t, the last error, if any, is stored in
  * the context and can be retrieved with cairo_status().
  *
  * New entries may be added in future versions.  Use cairo_status_to_string()
  * to get a human-readable representation of an error message.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_status {
     CAIRO_STATUS_SUCCESS = 0,
 
     CAIRO_STATUS_NO_MEMORY,
     CAIRO_STATUS_INVALID_RESTORE,
     CAIRO_STATUS_INVALID_POP_GROUP,
     CAIRO_STATUS_NO_CURRENT_POINT,
     CAIRO_STATUS_INVALID_MATRIX,
     CAIRO_STATUS_INVALID_STATUS,
     CAIRO_STATUS_NULL_POINTER,
     CAIRO_STATUS_INVALID_STRING,
     CAIRO_STATUS_INVALID_PATH_DATA,
     CAIRO_STATUS_READ_ERROR,
     CAIRO_STATUS_WRITE_ERROR,
     CAIRO_STATUS_SURFACE_FINISHED,
     CAIRO_STATUS_SURFACE_TYPE_MISMATCH,
     CAIRO_STATUS_PATTERN_TYPE_MISMATCH,
     CAIRO_STATUS_INVALID_CONTENT,
     CAIRO_STATUS_INVALID_FORMAT,
     CAIRO_STATUS_INVALID_VISUAL,
     CAIRO_STATUS_FILE_NOT_FOUND,
     CAIRO_STATUS_INVALID_DASH,
     CAIRO_STATUS_INVALID_DSC_COMMENT,
     CAIRO_STATUS_INVALID_INDEX,
     CAIRO_STATUS_CLIP_NOT_REPRESENTABLE,
     CAIRO_STATUS_TEMP_FILE_ERROR,
     CAIRO_STATUS_INVALID_STRIDE,
     CAIRO_STATUS_FONT_TYPE_MISMATCH,
     CAIRO_STATUS_USER_FONT_IMMUTABLE,
     CAIRO_STATUS_USER_FONT_ERROR,
     CAIRO_STATUS_NEGATIVE_COUNT,
     CAIRO_STATUS_INVALID_CLUSTERS,
     CAIRO_STATUS_INVALID_SLANT,
     CAIRO_STATUS_INVALID_WEIGHT,
     CAIRO_STATUS_INVALID_SIZE,
     CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED,
     CAIRO_STATUS_DEVICE_TYPE_MISMATCH,
     CAIRO_STATUS_DEVICE_ERROR,
     CAIRO_STATUS_INVALID_MESH_CONSTRUCTION,
     CAIRO_STATUS_DEVICE_FINISHED,
     CAIRO_STATUS_JBIG2_GLOBAL_MISSING,
     CAIRO_STATUS_PNG_ERROR,
     CAIRO_STATUS_FREETYPE_ERROR,
     CAIRO_STATUS_WIN32_GDI_ERROR,
     CAIRO_STATUS_TAG_ERROR,
     CAIRO_STATUS_DWRITE_ERROR,
     CAIRO_STATUS_SVG_FONT_ERROR,
 
     CAIRO_STATUS_LAST_STATUS
 } cairo_status_t;
 
 /**
  * cairo_content_t:
  * @CAIRO_CONTENT_COLOR: The surface will hold color content only. (Since 1.0)
  * @CAIRO_CONTENT_ALPHA: The surface will hold alpha content only. (Since 1.0)
  * @CAIRO_CONTENT_COLOR_ALPHA: The surface will hold color and alpha content. (Since 1.0)
  *
  * #cairo_content_t is used to describe the content that a surface will
  * contain, whether color information, alpha information (translucence
  * vs. opacity), or both.
  *
  * Note: The large values here are designed to keep #cairo_content_t
  * values distinct from #cairo_format_t values so that the
  * implementation can detect the error if users confuse the two types.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_content {
     CAIRO_CONTENT_COLOR     = 0x1000,
     CAIRO_CONTENT_ALPHA     = 0x2000,
     CAIRO_CONTENT_COLOR_ALPHA   = 0x3000
 } cairo_content_t;
 
 /**
  * cairo_format_t:
  * @CAIRO_FORMAT_INVALID: no such format exists or is supported.
  * @CAIRO_FORMAT_ARGB32: each pixel is a 32-bit quantity, with
  *   alpha in the upper 8 bits, then red, then green, then blue.
  *   The 32-bit quantities are stored native-endian. Pre-multiplied
  *   alpha is used. (That is, 50% transparent red is 0x80800000,
  *   not 0x80ff0000.) (Since 1.0)
  * @CAIRO_FORMAT_RGB24: each pixel is a 32-bit quantity, with
  *   the upper 8 bits unused. Red, Green, and Blue are stored
  *   in the remaining 24 bits in that order. (Since 1.0)
  * @CAIRO_FORMAT_A8: each pixel is a 8-bit quantity holding
  *   an alpha value. (Since 1.0)
  * @CAIRO_FORMAT_A1: each pixel is a 1-bit quantity holding
  *   an alpha value. Pixels are packed together into 32-bit
  *   quantities. The ordering of the bits matches the
  *   endianness of the platform. On a big-endian machine, the
  *   first pixel is in the uppermost bit, on a little-endian
  *   machine the first pixel is in the least-significant bit. (Since 1.0)
  * @CAIRO_FORMAT_RGB16_565: each pixel is a 16-bit quantity
  *   with red in the upper 5 bits, then green in the middle
  *   6 bits, and blue in the lower 5 bits. (Since 1.2)
  * @CAIRO_FORMAT_RGB30: like RGB24 but with 10bpc. (Since 1.12)
  * @CAIRO_FORMAT_RGB96F: 3 floats, R, G, B. (Since 1.17.2)
  * @CAIRO_FORMAT_RGBA128F: 4 floats, R, G, B, A. (Since 1.17.2)
  *
  * #cairo_format_t is used to identify the memory format of
  * image data.
  *
  * New entries may be added in future versions.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_format {
     CAIRO_FORMAT_INVALID   = -1,
     CAIRO_FORMAT_ARGB32    = 0,
     CAIRO_FORMAT_RGB24     = 1,
     CAIRO_FORMAT_A8        = 2,
     CAIRO_FORMAT_A1        = 3,
     CAIRO_FORMAT_RGB16_565 = 4,
     CAIRO_FORMAT_RGB30     = 5,
     CAIRO_FORMAT_RGB96F    = 6,
     CAIRO_FORMAT_RGBA128F  = 7
 } cairo_format_t;
 
 /**
  * cairo_dither_t:
  * @CAIRO_DITHER_NONE: No dithering.
  * @CAIRO_DITHER_DEFAULT: Default choice at cairo compile time. Currently NONE.
  * @CAIRO_DITHER_FAST: Fastest dithering algorithm supported by the backend
  * @CAIRO_DITHER_GOOD: An algorithm with smoother dithering than FAST
  * @CAIRO_DITHER_BEST: Best algorithm available in the backend
  *
  * Dither is an intentionally applied form of noise used to randomize
  * quantization error, preventing large-scale patterns such as color banding
  * in images (e.g. for gradients). Ordered dithering applies a precomputed
  * threshold matrix to spread the errors smoothly.
  *
  *  #cairo_dither_t is modeled on pixman dithering algorithm choice.
  * As of Pixman 0.40, FAST corresponds to a 8x8 ordered bayer noise and GOOD
  * and BEST use an ordered 64x64 precomputed blue noise.
  *
  * Since: 1.18
  **/
 typedef enum _cairo_dither {
     CAIRO_DITHER_NONE,
     CAIRO_DITHER_DEFAULT,
     CAIRO_DITHER_FAST,
     CAIRO_DITHER_GOOD,
     CAIRO_DITHER_BEST
 } cairo_dither_t;
 
 cairo_public void
 cairo_pattern_set_dither (cairo_pattern_t *pattern, cairo_dither_t dither);
 
 cairo_public cairo_dither_t
 cairo_pattern_get_dither (cairo_pattern_t *pattern);
 
 /**
  * cairo_write_func_t:
  * @closure: the output closure
  * @data: the buffer containing the data to write
  * @length: the amount of data to write
  *
  * #cairo_write_func_t is the type of function which is called when a
  * backend needs to write data to an output stream.  It is passed the
  * closure which was specified by the user at the time the write
  * function was registered, the data to write and the length of the
  * data in bytes.  The write function should return
  * %CAIRO_STATUS_SUCCESS if all the data was successfully written,
  * %CAIRO_STATUS_WRITE_ERROR otherwise.
  *
  * Returns: the status code of the write operation
  *
  * Since: 1.0
  **/
 typedef cairo_status_t (*cairo_write_func_t) (void        *closure,
                           const unsigned char *data,
                           unsigned int     length);
 
 /**
  * cairo_read_func_t:
  * @closure: the input closure
  * @data: the buffer into which to read the data
  * @length: the amount of data to read
  *
  * #cairo_read_func_t is the type of function which is called when a
  * backend needs to read data from an input stream.  It is passed the
  * closure which was specified by the user at the time the read
  * function was registered, the buffer to read the data into and the
  * length of the data in bytes.  The read function should return
  * %CAIRO_STATUS_SUCCESS if all the data was successfully read,
  * %CAIRO_STATUS_READ_ERROR otherwise.
  *
  * Returns: the status code of the read operation
  *
  * Since: 1.0
  **/
 typedef cairo_status_t (*cairo_read_func_t) (void       *closure,
                          unsigned char  *data,
                          unsigned int   length);
 
 /**
  * cairo_rectangle_int_t:
  * @x: X coordinate of the left side of the rectangle
  * @y: Y coordinate of the top side of the rectangle
  * @width: width of the rectangle
  * @height: height of the rectangle
  *
  * A data structure for holding a rectangle with integer coordinates.
  *
  * Since: 1.10
  **/
 
 typedef struct _cairo_rectangle_int {
     int x, y;
     int width, height;
 } cairo_rectangle_int_t;
 
 
 /* Functions for manipulating state objects */
 cairo_public cairo_t *
 cairo_create (cairo_surface_t *target);
 
 cairo_public cairo_t *
 cairo_reference (cairo_t *cr);
 
 cairo_public void
 cairo_destroy (cairo_t *cr);
 
 cairo_public unsigned int
 cairo_get_reference_count (cairo_t *cr);
 
 cairo_public void *
 cairo_get_user_data (cairo_t             *cr,
              const cairo_user_data_key_t *key);
 
 cairo_public cairo_status_t
 cairo_set_user_data (cairo_t             *cr,
              const cairo_user_data_key_t *key,
              void            *user_data,
              cairo_destroy_func_t     destroy);
 
 cairo_public void
 cairo_save (cairo_t *cr);
 
 cairo_public void
 cairo_restore (cairo_t *cr);
 
 cairo_public void
 cairo_push_group (cairo_t *cr);
 
 cairo_public void
 cairo_push_group_with_content (cairo_t *cr, cairo_content_t content);
 
 cairo_public cairo_pattern_t *
 cairo_pop_group (cairo_t *cr);
 
 cairo_public void
 cairo_pop_group_to_source (cairo_t *cr);
 
 /* Modify state */
 
 /**
  * cairo_operator_t:
  * @CAIRO_OPERATOR_CLEAR: clear destination layer (bounded) (Since 1.0)
  * @CAIRO_OPERATOR_SOURCE: replace destination layer (bounded) (Since 1.0)
  * @CAIRO_OPERATOR_OVER: draw source layer on top of destination layer
  * (bounded) (Since 1.0)
  * @CAIRO_OPERATOR_IN: draw source where there was destination content
  * (unbounded) (Since 1.0)
  * @CAIRO_OPERATOR_OUT: draw source where there was no destination
  * content (unbounded) (Since 1.0)
  * @CAIRO_OPERATOR_ATOP: draw source on top of destination content and
  * only there (Since 1.0)
  * @CAIRO_OPERATOR_DEST: ignore the source (Since 1.0)
  * @CAIRO_OPERATOR_DEST_OVER: draw destination on top of source (Since 1.0)
  * @CAIRO_OPERATOR_DEST_IN: leave destination only where there was
  * source content (unbounded) (Since 1.0)
  * @CAIRO_OPERATOR_DEST_OUT: leave destination only where there was no
  * source content (Since 1.0)
  * @CAIRO_OPERATOR_DEST_ATOP: leave destination on top of source content
  * and only there (unbounded) (Since 1.0)
  * @CAIRO_OPERATOR_XOR: source and destination are shown where there is only
  * one of them (Since 1.0)
  * @CAIRO_OPERATOR_ADD: source and destination layers are accumulated (Since 1.0)
  * @CAIRO_OPERATOR_SATURATE: like over, but assuming source and dest are
  * disjoint geometries (Since 1.0)
  * @CAIRO_OPERATOR_MULTIPLY: source and destination layers are multiplied.
  * This causes the result to be at least as dark as the darker inputs. (Since 1.10)
  * @CAIRO_OPERATOR_SCREEN: source and destination are complemented and
  * multiplied. This causes the result to be at least as light as the lighter
  * inputs. (Since 1.10)
  * @CAIRO_OPERATOR_OVERLAY: multiplies or screens, depending on the
  * lightness of the destination color. (Since 1.10)
  * @CAIRO_OPERATOR_DARKEN: replaces the destination with the source if it
  * is darker, otherwise keeps the source. (Since 1.10)
  * @CAIRO_OPERATOR_LIGHTEN: replaces the destination with the source if it
  * is lighter, otherwise keeps the source. (Since 1.10)
  * @CAIRO_OPERATOR_COLOR_DODGE: brightens the destination color to reflect
  * the source color. (Since 1.10)
  * @CAIRO_OPERATOR_COLOR_BURN: darkens the destination color to reflect
  * the source color. (Since 1.10)
  * @CAIRO_OPERATOR_HARD_LIGHT: Multiplies or screens, dependent on source
  * color. (Since 1.10)
  * @CAIRO_OPERATOR_SOFT_LIGHT: Darkens or lightens, dependent on source
  * color. (Since 1.10)
  * @CAIRO_OPERATOR_DIFFERENCE: Takes the difference of the source and
  * destination color. (Since 1.10)
  * @CAIRO_OPERATOR_EXCLUSION: Produces an effect similar to difference, but
  * with lower contrast. (Since 1.10)
  * @CAIRO_OPERATOR_HSL_HUE: Creates a color with the hue of the source
  * and the saturation and luminosity of the target. (Since 1.10)
  * @CAIRO_OPERATOR_HSL_SATURATION: Creates a color with the saturation
  * of the source and the hue and luminosity of the target. Painting with
  * this mode onto a gray area produces no change. (Since 1.10)
  * @CAIRO_OPERATOR_HSL_COLOR: Creates a color with the hue and saturation
  * of the source and the luminosity of the target. This preserves the gray
  * levels of the target and is useful for coloring monochrome images or
  * tinting color images. (Since 1.10)
  * @CAIRO_OPERATOR_HSL_LUMINOSITY: Creates a color with the luminosity of
  * the source and the hue and saturation of the target. This produces an
  * inverse effect to @CAIRO_OPERATOR_HSL_COLOR. (Since 1.10)
  *
  * #cairo_operator_t is used to set the compositing operator for all cairo
  * drawing operations.
  *
  * The default operator is %CAIRO_OPERATOR_OVER.
  *
  * The operators marked as <firstterm>unbounded</firstterm> modify their
  * destination even outside of the mask layer (that is, their effect is not
  * bound by the mask layer).  However, their effect can still be limited by
  * way of clipping.
  *
  * To keep things simple, the operator descriptions here
  * document the behavior for when both source and destination are either fully
  * transparent or fully opaque.  The actual implementation works for
  * translucent layers too.
  * For a more detailed explanation of the effects of each operator, including
  * the mathematical definitions, see
  * <ulink url="https://cairographics.org/operators/">https://cairographics.org/operators/</ulink>.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_operator {
     CAIRO_OPERATOR_CLEAR,
 
     CAIRO_OPERATOR_SOURCE,
     CAIRO_OPERATOR_OVER,
     CAIRO_OPERATOR_IN,
     CAIRO_OPERATOR_OUT,
     CAIRO_OPERATOR_ATOP,
 
     CAIRO_OPERATOR_DEST,
     CAIRO_OPERATOR_DEST_OVER,
     CAIRO_OPERATOR_DEST_IN,
     CAIRO_OPERATOR_DEST_OUT,
     CAIRO_OPERATOR_DEST_ATOP,
 
     CAIRO_OPERATOR_XOR,
     CAIRO_OPERATOR_ADD,
     CAIRO_OPERATOR_SATURATE,
 
     CAIRO_OPERATOR_MULTIPLY,
     CAIRO_OPERATOR_SCREEN,
     CAIRO_OPERATOR_OVERLAY,
     CAIRO_OPERATOR_DARKEN,
     CAIRO_OPERATOR_LIGHTEN,
     CAIRO_OPERATOR_COLOR_DODGE,
     CAIRO_OPERATOR_COLOR_BURN,
     CAIRO_OPERATOR_HARD_LIGHT,
     CAIRO_OPERATOR_SOFT_LIGHT,
     CAIRO_OPERATOR_DIFFERENCE,
     CAIRO_OPERATOR_EXCLUSION,
     CAIRO_OPERATOR_HSL_HUE,
     CAIRO_OPERATOR_HSL_SATURATION,
     CAIRO_OPERATOR_HSL_COLOR,
     CAIRO_OPERATOR_HSL_LUMINOSITY
 } cairo_operator_t;
 
 cairo_public void
 cairo_set_operator (cairo_t *cr, cairo_operator_t op);
 
 cairo_public void
 cairo_set_source (cairo_t *cr, cairo_pattern_t *source);
 
 cairo_public void
 cairo_set_source_rgb (cairo_t *cr, double red, double green, double blue);
 
 cairo_public void
 cairo_set_source_rgba (cairo_t *cr,
                double red, double green, double blue,
                double alpha);
 
 cairo_public void
 cairo_set_source_surface (cairo_t     *cr,
               cairo_surface_t *surface,
               double       x,
               double       y);
 
 cairo_public void
 cairo_set_tolerance (cairo_t *cr, double tolerance);
 
 /**
  * cairo_antialias_t:
  * @CAIRO_ANTIALIAS_DEFAULT: Use the default antialiasing for
  *   the subsystem and target device, since 1.0
  * @CAIRO_ANTIALIAS_NONE: Use a bilevel alpha mask, since 1.0
  * @CAIRO_ANTIALIAS_GRAY: Perform single-color antialiasing (using
  *  shades of gray for black text on a white background, for example), since 1.0
  * @CAIRO_ANTIALIAS_SUBPIXEL: Perform antialiasing by taking
  *  advantage of the order of subpixel elements on devices
  *  such as LCD panels, since 1.0
  * @CAIRO_ANTIALIAS_FAST: Hint that the backend should perform some
  * antialiasing but prefer speed over quality, since 1.12
  * @CAIRO_ANTIALIAS_GOOD: The backend should balance quality against
  * performance, since 1.12
  * @CAIRO_ANTIALIAS_BEST: Hint that the backend should render at the highest
  * quality, sacrificing speed if necessary, since 1.12
  *
  * Specifies the type of antialiasing to do when rendering text or shapes.
  *
  * As it is not necessarily clear from the above what advantages a particular
  * antialias method provides, since 1.12, there is also a set of hints:
  * @CAIRO_ANTIALIAS_FAST: Allow the backend to degrade raster quality for speed
  * @CAIRO_ANTIALIAS_GOOD: A balance between speed and quality
  * @CAIRO_ANTIALIAS_BEST: A high-fidelity, but potentially slow, raster mode
  *
  * These make no guarantee on how the backend will perform its rasterisation
  * (if it even rasterises!), nor that they have any differing effect other
  * than to enable some form of antialiasing. In the case of glyph rendering,
  * @CAIRO_ANTIALIAS_FAST and @CAIRO_ANTIALIAS_GOOD will be mapped to
  * @CAIRO_ANTIALIAS_GRAY, with @CAIRO_ANTALIAS_BEST being equivalent to
  * @CAIRO_ANTIALIAS_SUBPIXEL.
  *
  * The interpretation of @CAIRO_ANTIALIAS_DEFAULT is left entirely up to
  * the backend, typically this will be similar to @CAIRO_ANTIALIAS_GOOD.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_antialias {
     CAIRO_ANTIALIAS_DEFAULT,
 
     /* method */
     CAIRO_ANTIALIAS_NONE,
     CAIRO_ANTIALIAS_GRAY,
     CAIRO_ANTIALIAS_SUBPIXEL,
 
     /* hints */
     CAIRO_ANTIALIAS_FAST,
     CAIRO_ANTIALIAS_GOOD,
     CAIRO_ANTIALIAS_BEST
 } cairo_antialias_t;
 
 cairo_public void
 cairo_set_antialias (cairo_t *cr, cairo_antialias_t antialias);
 
 /**
  * cairo_fill_rule_t:
  * @CAIRO_FILL_RULE_WINDING: If the path crosses the ray from
  * left-to-right, counts +1. If the path crosses the ray
  * from right to left, counts -1. (Left and right are determined
  * from the perspective of looking along the ray from the starting
  * point.) If the total count is non-zero, the point will be filled. (Since 1.0)
  * @CAIRO_FILL_RULE_EVEN_ODD: Counts the total number of
  * intersections, without regard to the orientation of the contour. If
  * the total number of intersections is odd, the point will be
  * filled. (Since 1.0)
  *
  * #cairo_fill_rule_t is used to select how paths are filled. For both
  * fill rules, whether or not a point is included in the fill is
  * determined by taking a ray from that point to infinity and looking
  * at intersections with the path. The ray can be in any direction,
  * as long as it doesn't pass through the end point of a segment
  * or have a tricky intersection such as intersecting tangent to the path.
  * (Note that filling is not actually implemented in this way. This
  * is just a description of the rule that is applied.)
  *
  * The default fill rule is %CAIRO_FILL_RULE_WINDING.
  *
  * New entries may be added in future versions.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_fill_rule {
     CAIRO_FILL_RULE_WINDING,
     CAIRO_FILL_RULE_EVEN_ODD
 } cairo_fill_rule_t;
 
 cairo_public void
 cairo_set_fill_rule (cairo_t *cr, cairo_fill_rule_t fill_rule);
 
 cairo_public void
 cairo_set_line_width (cairo_t *cr, double width);
 
 cairo_public void
 cairo_set_hairline (cairo_t *cr, cairo_bool_t set_hairline);
 
 /**
  * cairo_line_cap_t:
  * @CAIRO_LINE_CAP_BUTT: start(stop) the line exactly at the start(end) point (Since 1.0)
  * @CAIRO_LINE_CAP_ROUND: use a round ending, the center of the circle is the end point (Since 1.0)
  * @CAIRO_LINE_CAP_SQUARE: use squared ending, the center of the square is the end point (Since 1.0)
  *
  * Specifies how to render the endpoints of the path when stroking.
  *
  * The default line cap style is %CAIRO_LINE_CAP_BUTT.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_line_cap {
     CAIRO_LINE_CAP_BUTT,
     CAIRO_LINE_CAP_ROUND,
     CAIRO_LINE_CAP_SQUARE
 } cairo_line_cap_t;
 
 cairo_public void
 cairo_set_line_cap (cairo_t *cr, cairo_line_cap_t line_cap);
 
 /**
  * cairo_line_join_t:
  * @CAIRO_LINE_JOIN_MITER: use a sharp (angled) corner, see
  * cairo_set_miter_limit() (Since 1.0)
  * @CAIRO_LINE_JOIN_ROUND: use a rounded join, the center of the circle is the
  * joint point (Since 1.0)
  * @CAIRO_LINE_JOIN_BEVEL: use a cut-off join, the join is cut off at half
  * the line width from the joint point (Since 1.0)
  *
  * Specifies how to render the junction of two lines when stroking.
  *
  * The default line join style is %CAIRO_LINE_JOIN_MITER.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_line_join {
     CAIRO_LINE_JOIN_MITER,
     CAIRO_LINE_JOIN_ROUND,
     CAIRO_LINE_JOIN_BEVEL
 } cairo_line_join_t;
 
 cairo_public void
 cairo_set_line_join (cairo_t *cr, cairo_line_join_t line_join);
 
 cairo_public void
 cairo_set_dash (cairo_t      *cr,
         const double *dashes,
         int       num_dashes,
         double        offset);
 
 cairo_public void
 cairo_set_miter_limit (cairo_t *cr, double limit);
 
 cairo_public void
 cairo_translate (cairo_t *cr, double tx, double ty);
 
 cairo_public void
 cairo_scale (cairo_t *cr, double sx, double sy);
 
 cairo_public void
 cairo_rotate (cairo_t *cr, double angle);
 
 cairo_public void
 cairo_transform (cairo_t          *cr,
          const cairo_matrix_t *matrix);
 
 cairo_public void
 cairo_set_matrix (cairo_t          *cr,
           const cairo_matrix_t *matrix);
 
 cairo_public void
 cairo_identity_matrix (cairo_t *cr);
 
 cairo_public void
 cairo_user_to_device (cairo_t *cr, double *x, double *y);
 
 cairo_public void
 cairo_user_to_device_distance (cairo_t *cr, double *dx, double *dy);
 
 cairo_public void
 cairo_device_to_user (cairo_t *cr, double *x, double *y);
 
 cairo_public void
 cairo_device_to_user_distance (cairo_t *cr, double *dx, double *dy);
 
 /* Path creation functions */
 cairo_public void
 cairo_new_path (cairo_t *cr);
 
 cairo_public void
 cairo_move_to (cairo_t *cr, double x, double y);
 
 cairo_public void
 cairo_new_sub_path (cairo_t *cr);
 
 cairo_public void
 cairo_line_to (cairo_t *cr, double x, double y);
 
 cairo_public void
 cairo_curve_to (cairo_t *cr,
         double x1, double y1,
         double x2, double y2,
         double x3, double y3);
 
 cairo_public void
 cairo_arc (cairo_t *cr,
        double xc, double yc,
        double radius,
        double angle1, double angle2);
 
 cairo_public void
 cairo_arc_negative (cairo_t *cr,
             double xc, double yc,
             double radius,
             double angle1, double angle2);
 
 /* XXX: NYI
 cairo_public void
 cairo_arc_to (cairo_t *cr,
           double x1, double y1,
           double x2, double y2,
           double radius);
 */
 
 cairo_public void
 cairo_rel_move_to (cairo_t *cr, double dx, double dy);
 
 cairo_public void
 cairo_rel_line_to (cairo_t *cr, double dx, double dy);
 
 cairo_public void
 cairo_rel_curve_to (cairo_t *cr,
             double dx1, double dy1,
             double dx2, double dy2,
             double dx3, double dy3);
 
 cairo_public void
 cairo_rectangle (cairo_t *cr,
          double x, double y,
          double width, double height);
 
 /* XXX: NYI
 cairo_public void
 cairo_stroke_to_path (cairo_t *cr);
 */
 
 cairo_public void
 cairo_close_path (cairo_t *cr);
 
 cairo_public void
 cairo_path_extents (cairo_t *cr,
             double *x1, double *y1,
             double *x2, double *y2);
 
 /* Painting functions */
 cairo_public void
 cairo_paint (cairo_t *cr);
 
 cairo_public void
 cairo_paint_with_alpha (cairo_t *cr,
             double   alpha);
 
 cairo_public void
 cairo_mask (cairo_t         *cr,
         cairo_pattern_t *pattern);
 
 cairo_public void
 cairo_mask_surface (cairo_t         *cr,
             cairo_surface_t *surface,
             double           surface_x,
             double           surface_y);
 
 cairo_public void
 cairo_stroke (cairo_t *cr);
 
 cairo_public void
 cairo_stroke_preserve (cairo_t *cr);
 
 cairo_public void
 cairo_fill (cairo_t *cr);
 
 cairo_public void
 cairo_fill_preserve (cairo_t *cr);
 
 cairo_public void
 cairo_copy_page (cairo_t *cr);
 
 cairo_public void
 cairo_show_page (cairo_t *cr);
 
 /* Insideness testing */
 cairo_public cairo_bool_t
 cairo_in_stroke (cairo_t *cr, double x, double y);
 
 cairo_public cairo_bool_t
 cairo_in_fill (cairo_t *cr, double x, double y);
 
 cairo_public cairo_bool_t
 cairo_in_clip (cairo_t *cr, double x, double y);
 
 /* Rectangular extents */
 cairo_public void
 cairo_stroke_extents (cairo_t *cr,
               double *x1, double *y1,
               double *x2, double *y2);
 
 cairo_public void
 cairo_fill_extents (cairo_t *cr,
             double *x1, double *y1,
             double *x2, double *y2);
 
 /* Clipping */
 cairo_public void
 cairo_reset_clip (cairo_t *cr);
 
 cairo_public void
 cairo_clip (cairo_t *cr);
 
 cairo_public void
 cairo_clip_preserve (cairo_t *cr);
 
 cairo_public void
 cairo_clip_extents (cairo_t *cr,
             double *x1, double *y1,
             double *x2, double *y2);
 
 /**
  * cairo_rectangle_t:
  * @x: X coordinate of the left side of the rectangle
  * @y: Y coordinate of the top side of the rectangle
  * @width: width of the rectangle
  * @height: height of the rectangle
  *
  * A data structure for holding a rectangle.
  *
  * Since: 1.4
  **/
 typedef struct _cairo_rectangle {
     double x, y, width, height;
 } cairo_rectangle_t;
 
 /**
  * cairo_rectangle_list_t:
  * @status: Error status of the rectangle list
  * @rectangles: Array containing the rectangles
  * @num_rectangles: Number of rectangles in this list
  * 
  * A data structure for holding a dynamically allocated
  * array of rectangles.
  *
  * Since: 1.4
  **/
 typedef struct _cairo_rectangle_list {
     cairo_status_t     status;
     cairo_rectangle_t *rectangles;
     int                num_rectangles;
 } cairo_rectangle_list_t;
 
 cairo_public cairo_rectangle_list_t *
 cairo_copy_clip_rectangle_list (cairo_t *cr);
 
 cairo_public void
 cairo_rectangle_list_destroy (cairo_rectangle_list_t *rectangle_list);
 
 /* Logical structure tagging functions */
 
 #define CAIRO_TAG_DEST "cairo.dest"
 #define CAIRO_TAG_LINK "Link"
 #define CAIRO_TAG_CONTENT "cairo.content"
 #define CAIRO_TAG_CONTENT_REF "cairo.content_ref"
 
 cairo_public void
 cairo_tag_begin (cairo_t *cr, const char *tag_name, const char *attributes);
 
 cairo_public void
 cairo_tag_end (cairo_t *cr, const char *tag_name);
 
 /* Font/Text functions */
 
 /**
  * cairo_scaled_font_t:
  *
  * A #cairo_scaled_font_t is a font scaled to a particular size and device
  * resolution. A #cairo_scaled_font_t is most useful for low-level font
  * usage where a library or application wants to cache a reference
  * to a scaled font to speed up the computation of metrics.
  *
  * There are various types of scaled fonts, depending on the
  * <firstterm>font backend</firstterm> they use. The type of a
  * scaled font can be queried using cairo_scaled_font_get_type().
  *
  * Memory management of #cairo_scaled_font_t is done with
  * cairo_scaled_font_reference() and cairo_scaled_font_destroy().
  *
  * Since: 1.0
  **/
 typedef struct _cairo_scaled_font cairo_scaled_font_t;
 
 /**
  * cairo_font_face_t:
  *
  * A #cairo_font_face_t specifies all aspects of a font other
  * than the size or font matrix (a font matrix is used to distort
  * a font by shearing it or scaling it unequally in the two
  * directions) . A font face can be set on a #cairo_t by using
  * cairo_set_font_face(); the size and font matrix are set with
  * cairo_set_font_size() and cairo_set_font_matrix().
  *
  * There are various types of font faces, depending on the
  * <firstterm>font backend</firstterm> they use. The type of a
  * font face can be queried using cairo_font_face_get_type().
  *
  * Memory management of #cairo_font_face_t is done with
  * cairo_font_face_reference() and cairo_font_face_destroy().
  *
  * Since: 1.0
  **/
 typedef struct _cairo_font_face cairo_font_face_t;
 
 /**
  * cairo_glyph_t:
  * @index: glyph index in the font. The exact interpretation of the
  *      glyph index depends on the font technology being used.
  * @x: the offset in the X direction between the origin used for
  *     drawing or measuring the string and the origin of this glyph.
  * @y: the offset in the Y direction between the origin used for
  *     drawing or measuring the string and the origin of this glyph.
  *
  * The #cairo_glyph_t structure holds information about a single glyph
  * when drawing or measuring text. A font is (in simple terms) a
  * collection of shapes used to draw text. A glyph is one of these
  * shapes. There can be multiple glyphs for a single character
  * (alternates to be used in different contexts, for example), or a
  * glyph can be a <firstterm>ligature</firstterm> of multiple
  * characters. Cairo doesn't expose any way of converting input text
  * into glyphs, so in order to use the Cairo interfaces that take
  * arrays of glyphs, you must directly access the appropriate
  * underlying font system.
  *
  * Note that the offsets given by @x and @y are not cumulative. When
  * drawing or measuring text, each glyph is individually positioned
  * with respect to the overall origin
  *
  * Since: 1.0
  **/
 typedef struct {
     unsigned long        index;
     double               x;
     double               y;
 } cairo_glyph_t;
 
 cairo_public cairo_glyph_t *
 cairo_glyph_allocate (int num_glyphs);
 
 cairo_public void
 cairo_glyph_free (cairo_glyph_t *glyphs);
 
 /**
  * cairo_text_cluster_t:
  * @num_bytes: the number of bytes of UTF-8 text covered by cluster
  * @num_glyphs: the number of glyphs covered by cluster
  *
  * The #cairo_text_cluster_t structure holds information about a single
  * <firstterm>text cluster</firstterm>.  A text cluster is a minimal
  * mapping of some glyphs corresponding to some UTF-8 text.
  *
  * For a cluster to be valid, both @num_bytes and @num_glyphs should
  * be non-negative, and at least one should be non-zero.
  * Note that clusters with zero glyphs are not as well supported as
  * normal clusters.  For example, PDF rendering applications typically
  * ignore those clusters when PDF text is being selected.
  *
  * See cairo_show_text_glyphs() for how clusters are used in advanced
  * text operations.
  *
  * Since: 1.8
  **/
 typedef struct {
     int        num_bytes;
     int        num_glyphs;
 } cairo_text_cluster_t;
 
 cairo_public cairo_text_cluster_t *
 cairo_text_cluster_allocate (int num_clusters);
 
 cairo_public void
 cairo_text_cluster_free (cairo_text_cluster_t *clusters);
 
 /**
  * cairo_text_cluster_flags_t:
  * @CAIRO_TEXT_CLUSTER_FLAG_BACKWARD: The clusters in the cluster array
  * map to glyphs in the glyph array from end to start. (Since 1.8)
  *
  * Specifies properties of a text cluster mapping.
  *
  * Since: 1.8
  **/
 typedef enum _cairo_text_cluster_flags {
     CAIRO_TEXT_CLUSTER_FLAG_BACKWARD = 0x00000001
 } cairo_text_cluster_flags_t;
 
 /**
  * cairo_text_extents_t:
  * @x_bearing: the horizontal distance from the origin to the
  *   leftmost part of the glyphs as drawn. Positive if the
  *   glyphs lie entirely to the right of the origin.
  * @y_bearing: the vertical distance from the origin to the
  *   topmost part of the glyphs as drawn. Positive only if the
  *   glyphs lie completely below the origin; will usually be
  *   negative.
  * @width: width of the glyphs as drawn
  * @height: height of the glyphs as drawn
  * @x_advance:distance to advance in the X direction
  *    after drawing these glyphs
  * @y_advance: distance to advance in the Y direction
  *   after drawing these glyphs. Will typically be zero except
  *   for vertical text layout as found in East-Asian languages.
  *
  * The #cairo_text_extents_t structure stores the extents of a single
  * glyph or a string of glyphs in user-space coordinates. Because text
  * extents are in user-space coordinates, they are mostly, but not
  * entirely, independent of the current transformation matrix. If you call
  * <literal>cairo_scale(cr, 2.0, 2.0)</literal>, text will
  * be drawn twice as big, but the reported text extents will not be
  * doubled. They will change slightly due to hinting (so you can't
  * assume that metrics are independent of the transformation matrix),
  * but otherwise will remain unchanged.
  *
  * Since: 1.0
  **/
 typedef struct {
     double x_bearing;
     double y_bearing;
     double width;
     double height;
     double x_advance;
     double y_advance;
 } cairo_text_extents_t;
 
 /**
  * cairo_font_extents_t:
  * @ascent: the distance that the font extends above the baseline.
  *          Note that this is not always exactly equal to the maximum
  *          of the extents of all the glyphs in the font, but rather
  *          is picked to express the font designer's intent as to
  *          how the font should align with elements above it.
  * @descent: the distance that the font extends below the baseline.
  *           This value is positive for typical fonts that include
  *           portions below the baseline. Note that this is not always
  *           exactly equal to the maximum of the extents of all the
  *           glyphs in the font, but rather is picked to express the
  *           font designer's intent as to how the font should
  *           align with elements below it.
  * @height: the recommended vertical distance between baselines when
  *          setting consecutive lines of text with the font. This
  *          is greater than @ascent+@descent by a
  *          quantity known as the <firstterm>line spacing</firstterm>
  *          or <firstterm>external leading</firstterm>. When space
  *          is at a premium, most fonts can be set with only
  *          a distance of @ascent+@descent between lines.
  * @max_x_advance: the maximum distance in the X direction that
  *         the origin is advanced for any glyph in the font.
  * @max_y_advance: the maximum distance in the Y direction that
  *         the origin is advanced for any glyph in the font.
  *         This will be zero for normal fonts used for horizontal
  *         writing. (The scripts of East Asia are sometimes written
  *         vertically.)
  *
  * The #cairo_font_extents_t structure stores metric information for
  * a font. Values are given in the current user-space coordinate
  * system.
  *
  * Because font metrics are in user-space coordinates, they are
  * mostly, but not entirely, independent of the current transformation
  * matrix. If you call <literal>cairo_scale(cr, 2.0, 2.0)</literal>,
  * text will be drawn twice as big, but the reported text extents will
  * not be doubled. They will change slightly due to hinting (so you
  * can't assume that metrics are independent of the transformation
  * matrix), but otherwise will remain unchanged.
  *
  * Since: 1.0
  **/
 typedef struct {
     double ascent;
     double descent;
     double height;
     double max_x_advance;
     double max_y_advance;
 } cairo_font_extents_t;
 
 /**
  * cairo_font_slant_t:
  * @CAIRO_FONT_SLANT_NORMAL: Upright font style, since 1.0
  * @CAIRO_FONT_SLANT_ITALIC: Italic font style, since 1.0
  * @CAIRO_FONT_SLANT_OBLIQUE: Oblique font style, since 1.0
  *
  * Specifies variants of a font face based on their slant.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_font_slant {
     CAIRO_FONT_SLANT_NORMAL,
     CAIRO_FONT_SLANT_ITALIC,
     CAIRO_FONT_SLANT_OBLIQUE
 } cairo_font_slant_t;
 
 /**
  * cairo_font_weight_t:
  * @CAIRO_FONT_WEIGHT_NORMAL: Normal font weight, since 1.0
  * @CAIRO_FONT_WEIGHT_BOLD: Bold font weight, since 1.0
  *
  * Specifies variants of a font face based on their weight.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_font_weight {
     CAIRO_FONT_WEIGHT_NORMAL,
     CAIRO_FONT_WEIGHT_BOLD
 } cairo_font_weight_t;
 
 /**
  * cairo_subpixel_order_t:
  * @CAIRO_SUBPIXEL_ORDER_DEFAULT: Use the default subpixel order for
  *   for the target device, since 1.0
  * @CAIRO_SUBPIXEL_ORDER_RGB: Subpixel elements are arranged horizontally
  *   with red at the left, since 1.0
  * @CAIRO_SUBPIXEL_ORDER_BGR:  Subpixel elements are arranged horizontally
  *   with blue at the left, since 1.0
  * @CAIRO_SUBPIXEL_ORDER_VRGB: Subpixel elements are arranged vertically
  *   with red at the top, since 1.0
  * @CAIRO_SUBPIXEL_ORDER_VBGR: Subpixel elements are arranged vertically
  *   with blue at the top, since 1.0
  *
  * The subpixel order specifies the order of color elements within
  * each pixel on the display device when rendering with an
  * antialiasing mode of %CAIRO_ANTIALIAS_SUBPIXEL.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_subpixel_order {
     CAIRO_SUBPIXEL_ORDER_DEFAULT,
     CAIRO_SUBPIXEL_ORDER_RGB,
     CAIRO_SUBPIXEL_ORDER_BGR,
     CAIRO_SUBPIXEL_ORDER_VRGB,
     CAIRO_SUBPIXEL_ORDER_VBGR
 } cairo_subpixel_order_t;
 
 /**
  * cairo_hint_style_t:
  * @CAIRO_HINT_STYLE_DEFAULT: Use the default hint style for
  *   font backend and target device, since 1.0
  * @CAIRO_HINT_STYLE_NONE: Do not hint outlines, since 1.0
  * @CAIRO_HINT_STYLE_SLIGHT: Hint outlines slightly to improve
  *   contrast while retaining good fidelity to the original
  *   shapes, since 1.0
  * @CAIRO_HINT_STYLE_MEDIUM: Hint outlines with medium strength
  *   giving a compromise between fidelity to the original shapes
  *   and contrast, since 1.0
  * @CAIRO_HINT_STYLE_FULL: Hint outlines to maximize contrast, since 1.0
  *
  * Specifies the type of hinting to do on font outlines. Hinting
  * is the process of fitting outlines to the pixel grid in order
  * to improve the appearance of the result. Since hinting outlines
  * involves distorting them, it also reduces the faithfulness
  * to the original outline shapes. Not all of the outline hinting
  * styles are supported by all font backends.
  *
  * New entries may be added in future versions.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_hint_style {
     CAIRO_HINT_STYLE_DEFAULT,
     CAIRO_HINT_STYLE_NONE,
     CAIRO_HINT_STYLE_SLIGHT,
     CAIRO_HINT_STYLE_MEDIUM,
     CAIRO_HINT_STYLE_FULL
 } cairo_hint_style_t;
 
 /**
  * cairo_hint_metrics_t:
  * @CAIRO_HINT_METRICS_DEFAULT: Hint metrics in the default
  *  manner for the font backend and target device, since 1.0
  * @CAIRO_HINT_METRICS_OFF: Do not hint font metrics, since 1.0
  * @CAIRO_HINT_METRICS_ON: Hint font metrics, since 1.0
  *
  * Specifies whether to hint font metrics; hinting font metrics
  * means quantizing them so that they are integer values in
  * device space. Doing this improves the consistency of
  * letter and line spacing, however it also means that text
  * will be laid out differently at different zoom factors.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_hint_metrics {
     CAIRO_HINT_METRICS_DEFAULT,
     CAIRO_HINT_METRICS_OFF,
     CAIRO_HINT_METRICS_ON
 } cairo_hint_metrics_t;
 
 /**
  * cairo_color_mode_t:
  * @CAIRO_COLOR_MODE_DEFAULT: Use the default color mode for
  * font backend and target device, since 1.18.
  * @CAIRO_COLOR_MODE_NO_COLOR: Disable rendering color glyphs. Glyphs are
  * always rendered as outline glyphs, since 1.18.
  * @CAIRO_COLOR_MODE_COLOR: Enable rendering color glyphs. If the font
  * contains a color presentation for a glyph, and when supported by
  * the font backend, the glyph will be rendered in color, since 1.18.
  *
  * Specifies if color fonts are to be rendered using the color
  * glyphs or outline glyphs. Glyphs that do not have a color
  * presentation, and non-color fonts are not affected by this font
  * option.
  *
  * Since: 1.18
  **/
 typedef enum _cairo_color_mode {
     CAIRO_COLOR_MODE_DEFAULT,
     CAIRO_COLOR_MODE_NO_COLOR,
     CAIRO_COLOR_MODE_COLOR
 } cairo_color_mode_t;
 
 /**
  * cairo_font_options_t:
  *
  * An opaque structure holding all options that are used when
  * rendering fonts.
  *
  * Individual features of a #cairo_font_options_t can be set or
  * accessed using functions named
  * <function>cairo_font_options_set_<emphasis>feature_name</emphasis>()</function> and
  * <function>cairo_font_options_get_<emphasis>feature_name</emphasis>()</function>, like
  * cairo_font_options_set_antialias() and
  * cairo_font_options_get_antialias().
  *
  * New features may be added to a #cairo_font_options_t in the
  * future.  For this reason, cairo_font_options_copy(),
  * cairo_font_options_equal(), cairo_font_options_merge(), and
  * cairo_font_options_hash() should be used to copy, check
  * for equality, merge, or compute a hash value of
  * #cairo_font_options_t objects.
  *
  * Since: 1.0
  **/
 typedef struct _cairo_font_options cairo_font_options_t;
 
 cairo_public cairo_font_options_t *
 cairo_font_options_create (void);
 
 cairo_public cairo_font_options_t *
 cairo_font_options_copy (const cairo_font_options_t *original);
 
 cairo_public void
 cairo_font_options_destroy (cairo_font_options_t *options);
 
 cairo_public cairo_status_t
 cairo_font_options_status (cairo_font_options_t *options);
 
 cairo_public void
 cairo_font_options_merge (cairo_font_options_t       *options,
               const cairo_font_options_t *other);
 cairo_public cairo_bool_t
 cairo_font_options_equal (const cairo_font_options_t *options,
               const cairo_font_options_t *other);
 
 cairo_public unsigned long
 cairo_font_options_hash (const cairo_font_options_t *options);
 
 cairo_public void
 cairo_font_options_set_antialias (cairo_font_options_t *options,
                   cairo_antialias_t     antialias);
 cairo_public cairo_antialias_t
 cairo_font_options_get_antialias (const cairo_font_options_t *options);
 
 cairo_public void
 cairo_font_options_set_subpixel_order (cairo_font_options_t   *options,
                        cairo_subpixel_order_t  subpixel_order);
 cairo_public cairo_subpixel_order_t
 cairo_font_options_get_subpixel_order (const cairo_font_options_t *options);
 
 cairo_public void
 cairo_font_options_set_hint_style (cairo_font_options_t *options,
                    cairo_hint_style_t     hint_style);
 cairo_public cairo_hint_style_t
 cairo_font_options_get_hint_style (const cairo_font_options_t *options);
 
 cairo_public void
 cairo_font_options_set_hint_metrics (cairo_font_options_t *options,
                      cairo_hint_metrics_t  hint_metrics);
 cairo_public cairo_hint_metrics_t
 cairo_font_options_get_hint_metrics (const cairo_font_options_t *options);
 
 cairo_public const char *
 cairo_font_options_get_variations (cairo_font_options_t *options);
 
 cairo_public void
 cairo_font_options_set_variations (cairo_font_options_t *options,
                                    const char           *variations);
 
 #define CAIRO_COLOR_PALETTE_DEFAULT 0
 
 cairo_public void
 cairo_font_options_set_color_mode (cairo_font_options_t *options,
                                    cairo_color_mode_t    color_mode);
 
 cairo_public cairo_color_mode_t
 cairo_font_options_get_color_mode (const cairo_font_options_t *options);
 
 cairo_public unsigned int
 cairo_font_options_get_color_palette (const cairo_font_options_t *options);
 
 cairo_public void
 cairo_font_options_set_color_palette (cairo_font_options_t *options,
                                       unsigned int          palette_index);
 
 cairo_public void
 cairo_font_options_set_custom_palette_color (cairo_font_options_t *options,
                                              unsigned int index,
                                              double red, double green,
                                              double blue, double alpha);
 
 cairo_public cairo_status_t
 cairo_font_options_get_custom_palette_color (cairo_font_options_t *options,
                                              unsigned int index,
                                              double *red, double *green,
                                              double *blue, double *alpha);
 
 /* This interface is for dealing with text as text, not caring about the
    font object inside the cairo_t. */
 
 cairo_public void
 cairo_select_font_face (cairo_t              *cr,
             const char           *family,
             cairo_font_slant_t   slant,
             cairo_font_weight_t  weight);
 
 cairo_public void
 cairo_set_font_size (cairo_t *cr, double size);
 
 cairo_public void
 cairo_set_font_matrix (cairo_t          *cr,
                const cairo_matrix_t *matrix);
 
 cairo_public void
 cairo_get_font_matrix (cairo_t *cr,
                cairo_matrix_t *matrix);
 
 cairo_public void
 cairo_set_font_options (cairo_t                    *cr,
             const cairo_font_options_t *options);
 
 cairo_public void
 cairo_get_font_options (cairo_t              *cr,
             cairo_font_options_t *options);
 
 cairo_public void
 cairo_set_font_face (cairo_t *cr, cairo_font_face_t *font_face);
 
 cairo_public cairo_font_face_t *
 cairo_get_font_face (cairo_t *cr);
 
 cairo_public void
 cairo_set_scaled_font (cairo_t                   *cr,
                const cairo_scaled_font_t *scaled_font);
 
 cairo_public cairo_scaled_font_t *
 cairo_get_scaled_font (cairo_t *cr);
 
 cairo_public void
 cairo_show_text (cairo_t *cr, const char *utf8);
 
 cairo_public void
 cairo_show_glyphs (cairo_t *cr, const cairo_glyph_t *glyphs, int num_glyphs);
 
 cairo_public void
 cairo_show_text_glyphs (cairo_t            *cr,
             const char         *utf8,
             int             utf8_len,
             const cairo_glyph_t    *glyphs,
             int             num_glyphs,
             const cairo_text_cluster_t *clusters,
             int             num_clusters,
             cairo_text_cluster_flags_t  cluster_flags);
 
 cairo_public void
 cairo_text_path  (cairo_t *cr, const char *utf8);
 
 cairo_public void
 cairo_glyph_path (cairo_t *cr, const cairo_glyph_t *glyphs, int num_glyphs);
 
 cairo_public void
 cairo_text_extents (cairo_t              *cr,
             const char       *utf8,
             cairo_text_extents_t *extents);
 
 cairo_public void
 cairo_glyph_extents (cairo_t               *cr,
              const cairo_glyph_t   *glyphs,
              int                   num_glyphs,
              cairo_text_extents_t  *extents);
 
 cairo_public void
 cairo_font_extents (cairo_t              *cr,
             cairo_font_extents_t *extents);
 
 /* Generic identifier for a font style */
 
 cairo_public cairo_font_face_t *
 cairo_font_face_reference (cairo_font_face_t *font_face);
 
 cairo_public void
 cairo_font_face_destroy (cairo_font_face_t *font_face);
 
 cairo_public unsigned int
 cairo_font_face_get_reference_count (cairo_font_face_t *font_face);
 
 cairo_public cairo_status_t
 cairo_font_face_status (cairo_font_face_t *font_face);
 
 
 /**
  * cairo_font_type_t:
  * @CAIRO_FONT_TYPE_TOY: The font was created using cairo's toy font api (Since: 1.2)
  * @CAIRO_FONT_TYPE_FT: The font is of type FreeType (Since: 1.2)
  * @CAIRO_FONT_TYPE_WIN32: The font is of type Win32 (Since: 1.2)
  * @CAIRO_FONT_TYPE_QUARTZ: The font is of type Quartz (Since: 1.6, in 1.2 and
  * 1.4 it was named CAIRO_FONT_TYPE_ATSUI)
  * @CAIRO_FONT_TYPE_USER: The font was create using cairo's user font api (Since: 1.8)
  * @CAIRO_FONT_TYPE_DWRITE: The font is of type Win32 DWrite (Since: 1.18)
  *
  * #cairo_font_type_t is used to describe the type of a given font
  * face or scaled font. The font types are also known as "font
  * backends" within cairo.
  *
  * The type of a font face is determined by the function used to
  * create it, which will generally be of the form
  * <function>cairo_<emphasis>type</emphasis>_font_face_create(<!-- -->)</function>.
  * The font face type can be queried with cairo_font_face_get_type()
  *
  * The various #cairo_font_face_t functions can be used with a font face
  * of any type.
  *
  * The type of a scaled font is determined by the type of the font
  * face passed to cairo_scaled_font_create(). The scaled font type can
  * be queried with cairo_scaled_font_get_type()
  *
  * The various #cairo_scaled_font_t functions can be used with scaled
  * fonts of any type, but some font backends also provide
  * type-specific functions that must only be called with a scaled font
  * of the appropriate type. These functions have names that begin with
  * <function>cairo_<emphasis>type</emphasis>_scaled_font(<!-- -->)</function>
  * such as cairo_ft_scaled_font_lock_face().
  *
  * The behavior of calling a type-specific function with a scaled font
  * of the wrong type is undefined.
  *
  * New entries may be added in future versions.
  *
  * Since: 1.2
  **/
 typedef enum _cairo_font_type {
     CAIRO_FONT_TYPE_TOY,
     CAIRO_FONT_TYPE_FT,
     CAIRO_FONT_TYPE_WIN32,
     CAIRO_FONT_TYPE_QUARTZ,
     CAIRO_FONT_TYPE_USER,
     CAIRO_FONT_TYPE_DWRITE
 } cairo_font_type_t;
 
 cairo_public cairo_font_type_t
 cairo_font_face_get_type (cairo_font_face_t *font_face);
 
 cairo_public void *
 cairo_font_face_get_user_data (cairo_font_face_t       *font_face,
                    const cairo_user_data_key_t *key);
 
 cairo_public cairo_status_t
 cairo_font_face_set_user_data (cairo_font_face_t       *font_face,
                    const cairo_user_data_key_t *key,
                    void            *user_data,
                    cairo_destroy_func_t     destroy);
 
 /* Portable interface to general font features. */
 
 cairo_public cairo_scaled_font_t *
 cairo_scaled_font_create (cairo_font_face_t          *font_face,
               const cairo_matrix_t       *font_matrix,
               const cairo_matrix_t       *ctm,
               const cairo_font_options_t *options);
 
 cairo_public cairo_scaled_font_t *
 cairo_scaled_font_reference (cairo_scaled_font_t *scaled_font);
 
 cairo_public void
 cairo_scaled_font_destroy (cairo_scaled_font_t *scaled_font);
 
 cairo_public unsigned int
 cairo_scaled_font_get_reference_count (cairo_scaled_font_t *scaled_font);
 
 cairo_public cairo_status_t
 cairo_scaled_font_status (cairo_scaled_font_t *scaled_font);
 
 cairo_public cairo_font_type_t
 cairo_scaled_font_get_type (cairo_scaled_font_t *scaled_font);
 
 cairo_public void *
 cairo_scaled_font_get_user_data (cairo_scaled_font_t         *scaled_font,
                  const cairo_user_data_key_t *key);
 
 cairo_public cairo_status_t
 cairo_scaled_font_set_user_data (cairo_scaled_font_t         *scaled_font,
                  const cairo_user_data_key_t *key,
                  void                        *user_data,
                  cairo_destroy_func_t         destroy);
 
 cairo_public void
 cairo_scaled_font_extents (cairo_scaled_font_t  *scaled_font,
                cairo_font_extents_t *extents);
 
 cairo_public void
 cairo_scaled_font_text_extents (cairo_scaled_font_t  *scaled_font,
                 const char           *utf8,
                 cairo_text_extents_t *extents);
 
 cairo_public void
 cairo_scaled_font_glyph_extents (cairo_scaled_font_t   *scaled_font,
                  const cairo_glyph_t   *glyphs,
                  int                   num_glyphs,
                  cairo_text_extents_t  *extents);
 
 cairo_public cairo_status_t
 cairo_scaled_font_text_to_glyphs (cairo_scaled_font_t        *scaled_font,
                   double              x,
                   double              y,
                   const char                 *utf8,
                   int                     utf8_len,
                   cairo_glyph_t             **glyphs,
                   int                    *num_glyphs,
                   cairo_text_cluster_t      **clusters,
                   int                    *num_clusters,
                   cairo_text_cluster_flags_t *cluster_flags);
 
 cairo_public cairo_font_face_t *
 cairo_scaled_font_get_font_face (cairo_scaled_font_t *scaled_font);
 
 cairo_public void
 cairo_scaled_font_get_font_matrix (cairo_scaled_font_t  *scaled_font,
                    cairo_matrix_t   *font_matrix);
 
 cairo_public void
 cairo_scaled_font_get_ctm (cairo_scaled_font_t  *scaled_font,
                cairo_matrix_t   *ctm);
 
 cairo_public void
 cairo_scaled_font_get_scale_matrix (cairo_scaled_font_t *scaled_font,
                     cairo_matrix_t  *scale_matrix);
 
 cairo_public void
 cairo_scaled_font_get_font_options (cairo_scaled_font_t     *scaled_font,
                     cairo_font_options_t    *options);
 
 
 /* Toy fonts */
 
 cairo_public cairo_font_face_t *
 cairo_toy_font_face_create (const char           *family,
                 cairo_font_slant_t    slant,
                 cairo_font_weight_t   weight);
 
 cairo_public const char *
 cairo_toy_font_face_get_family (cairo_font_face_t *font_face);
 
 cairo_public cairo_font_slant_t
 cairo_toy_font_face_get_slant (cairo_font_face_t *font_face);
 
 cairo_public cairo_font_weight_t
 cairo_toy_font_face_get_weight (cairo_font_face_t *font_face);
 
 
 /* User fonts */
 
 cairo_public cairo_font_face_t *
 cairo_user_font_face_create (void);
 
 /* User-font method signatures */
 
 /**
  * cairo_user_scaled_font_init_func_t:
  * @scaled_font: the scaled-font being created
  * @cr: a cairo context, in font space
  * @extents: font extents to fill in, in font space
  *
  * #cairo_user_scaled_font_init_func_t is the type of function which is
  * called when a scaled-font needs to be created for a user font-face.
  *
  * The cairo context @cr is not used by the caller, but is prepared in font
  * space, similar to what the cairo contexts passed to the render_glyph
  * method will look like.  The callback can use this context for extents
  * computation for example.  After the callback is called, @cr is checked
  * for any error status.
  *
  * The @extents argument is where the user font sets the font extents for
  * @scaled_font.  It is in font space, which means that for most cases its
  * ascent and descent members should add to 1.0.  @extents is preset to
  * hold a value of 1.0 for ascent, height, and max_x_advance, and 0.0 for
  * descent and max_y_advance members.
  *
  * The callback is optional.  If not set, default font extents as described
  * in the previous paragraph will be used.
  *
  * Note that @scaled_font is not fully initialized at this
  * point and trying to use it for text operations in the callback will result
  * in deadlock.
  *
  * Returns: %CAIRO_STATUS_SUCCESS upon success, or an error status on error.
  *
  * Since: 1.8
  **/
 typedef cairo_status_t (*cairo_user_scaled_font_init_func_t) (cairo_scaled_font_t  *scaled_font,
                                   cairo_t              *cr,
                                   cairo_font_extents_t *extents);
 
 /**
  * cairo_user_scaled_font_render_glyph_func_t:
  * @scaled_font: user scaled-font
  * @glyph: glyph code to render
  * @cr: cairo context to draw to, in font space
  * @extents: glyph extents to fill in, in font space
  *
  * #cairo_user_scaled_font_render_glyph_func_t is the type of function which
  * is called when a user scaled-font needs to render a glyph.
  *
  * The callback is mandatory, and expected to draw the glyph with code @glyph to
  * the cairo context @cr.  @cr is prepared such that the glyph drawing is done in
  * font space.  That is, the matrix set on @cr is the scale matrix of @scaled_font.
  * The @extents argument is where the user font sets the font extents for
  * @scaled_font.  However, if user prefers to draw in user space, they can
  * achieve that by changing the matrix on @cr.
  *
  * All cairo rendering operations to @cr are permitted. However, when
  * this callback is set with
  * cairo_user_font_face_set_render_glyph_func(), the result is
  * undefined if any source other than the default source on @cr is
  * used.  That means, glyph bitmaps should be rendered using
  * cairo_mask() instead of cairo_paint().
  *
  * When this callback is set with
  * cairo_user_font_face_set_render_color_glyph_func(), the default
  * source is black. Setting the source is a valid
  * operation. cairo_user_scaled_font_get_foreground_marker() or
  * cairo_user_scaled_font_get_foreground_source() may be called to
  * obtain the current source at the time the glyph is rendered.
  *
  * Other non-default settings on @cr include a font size of 1.0 (given that
  * it is set up to be in font space), and font options corresponding to
  * @scaled_font.
  *
  * The @extents argument is preset to have <literal>x_bearing</literal>,
  * <literal>width</literal>, and <literal>y_advance</literal> of zero,
  * <literal>y_bearing</literal> set to <literal>-font_extents.ascent</literal>,
  * <literal>height</literal> to <literal>font_extents.ascent+font_extents.descent</literal>,
  * and <literal>x_advance</literal> to <literal>font_extents.max_x_advance</literal>.
  * The only field user needs to set in majority of cases is
  * <literal>x_advance</literal>.
  * If the <literal>width</literal> field is zero upon the callback returning
  * (which is its preset value), the glyph extents are automatically computed
  * based on the drawings done to @cr.  This is in most cases exactly what the
  * desired behavior is.  However, if for any reason the callback sets the
  * extents, it must be ink extents, and include the extents of all drawing
  * done to @cr in the callback.
  *
  * Where both color and non-color callbacks has been set using
  * cairo_user_font_face_set_render_color_glyph_func(), and
  * cairo_user_font_face_set_render_glyph_func(), the color glyph
  * callback will be called first. If the color glyph callback returns
  * %CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED, any drawing operations are
  * discarded and the non-color callback will be called. This is the
  * only case in which the %CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED may
  * be returned from a render callback. This fallback sequence allows a
  * user font face to contain a combination of both color and non-color
  * glyphs.
  *
  * Returns: %CAIRO_STATUS_SUCCESS upon success,
  * %CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED if fallback options should be tried,
  * or %CAIRO_STATUS_USER_FONT_ERROR or any other error status on error.
  *
  * Since: 1.8
  **/
 typedef cairo_status_t (*cairo_user_scaled_font_render_glyph_func_t) (cairo_scaled_font_t  *scaled_font,
                                       unsigned long         glyph,
                                       cairo_t              *cr,
                                       cairo_text_extents_t *extents);
 
 /**
  * cairo_user_scaled_font_text_to_glyphs_func_t:
  * @scaled_font: the scaled-font being created
  * @utf8: a string of text encoded in UTF-8
  * @utf8_len: length of @utf8 in bytes
  * @glyphs: pointer to array of glyphs to fill, in font space
  * @num_glyphs: pointer to number of glyphs
  * @clusters: pointer to array of cluster mapping information to fill, or %NULL
  * @num_clusters: pointer to number of clusters
  * @cluster_flags: pointer to location to store cluster flags corresponding to the
  *                 output @clusters
  *
  * #cairo_user_scaled_font_text_to_glyphs_func_t is the type of function which
  * is called to convert input text to an array of glyphs.  This is used by the
  * cairo_show_text() operation.
  *
  * Using this callback the user-font has full control on glyphs and their
  * positions.  That means, it allows for features like ligatures and kerning,
  * as well as complex <firstterm>shaping</firstterm> required for scripts like
  * Arabic and Indic.
  *
  * The @num_glyphs argument is preset to the number of glyph entries available
  * in the @glyphs buffer. If the @glyphs buffer is %NULL, the value of
  * @num_glyphs will be zero.  If the provided glyph array is too short for
  * the conversion (or for convenience), a new glyph array may be allocated
  * using cairo_glyph_allocate() and placed in @glyphs.  Upon return,
  * @num_glyphs should contain the number of generated glyphs.  If the value
  * @glyphs points at has changed after the call, the caller will free the
  * allocated glyph array using cairo_glyph_free().  The caller will also free
  * the original value of @glyphs, so the callback shouldn't do so.
  * The callback should populate the glyph indices and positions (in font space)
  * assuming that the text is to be shown at the origin.
  *
  * If @clusters is not %NULL, @num_clusters and @cluster_flags are also
  * non-%NULL, and cluster mapping should be computed. The semantics of how
  * cluster array allocation works is similar to the glyph array.  That is,
  * if @clusters initially points to a non-%NULL value, that array may be used
  * as a cluster buffer, and @num_clusters points to the number of cluster
  * entries available there.  If the provided cluster array is too short for
  * the conversion (or for convenience), a new cluster array may be allocated
  * using cairo_text_cluster_allocate() and placed in @clusters.  In this case,
  * the original value of @clusters will still be freed by the caller.  Upon
  * return, @num_clusters should contain the number of generated clusters.
  * If the value @clusters points at has changed after the call, the caller
  * will free the allocated cluster array using cairo_text_cluster_free().
  *
  * The callback is optional.  If @num_glyphs is negative upon
  * the callback returning or if the return value
  * is %CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED, the unicode_to_glyph callback
  * is tried.  See #cairo_user_scaled_font_unicode_to_glyph_func_t.
  *
  * Note: While cairo does not impose any limitation on glyph indices,
  * some applications may assume that a glyph index fits in a 16-bit
  * unsigned integer.  As such, it is advised that user-fonts keep their
  * glyphs in the 0 to 65535 range.  Furthermore, some applications may
  * assume that glyph 0 is a special glyph-not-found glyph.  User-fonts
  * are advised to use glyph 0 for such purposes and do not use that
  * glyph value for other purposes.
  *
  * Returns: %CAIRO_STATUS_SUCCESS upon success,
  * %CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED if fallback options should be tried,
  * or %CAIRO_STATUS_USER_FONT_ERROR or any other error status on error.
  *
  * Since: 1.8
  **/
 typedef cairo_status_t (*cairo_user_scaled_font_text_to_glyphs_func_t) (cairo_scaled_font_t        *scaled_font,
                                     const char             *utf8,
                                     int                 utf8_len,
                                     cairo_glyph_t             **glyphs,
                                     int                *num_glyphs,
                                     cairo_text_cluster_t      **clusters,
                                     int                *num_clusters,
                                     cairo_text_cluster_flags_t *cluster_flags);
 
 /**
  * cairo_user_scaled_font_unicode_to_glyph_func_t:
  * @scaled_font: the scaled-font being created
  * @unicode: input unicode character code-point
  * @glyph_index: output glyph index
  *
  * #cairo_user_scaled_font_unicode_to_glyph_func_t is the type of function which
  * is called to convert an input Unicode character to a single glyph.
  * This is used by the cairo_show_text() operation.
  *
  * This callback is used to provide the same functionality as the
  * text_to_glyphs callback does (see #cairo_user_scaled_font_text_to_glyphs_func_t)
  * but has much less control on the output,
  * in exchange for increased ease of use.  The inherent assumption to using
  * this callback is that each character maps to one glyph, and that the
  * mapping is context independent.  It also assumes that glyphs are positioned
  * according to their advance width.  These mean no ligatures, kerning, or
  * complex scripts can be implemented using this callback.
  *
  * The callback is optional, and only used if text_to_glyphs callback is not
  * set or fails to return glyphs.  If this callback is not set or if it returns
  * %CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED, an identity mapping from Unicode
  * code-points to glyph indices is assumed.
  *
  * Note: While cairo does not impose any limitation on glyph indices,
  * some applications may assume that a glyph index fits in a 16-bit
  * unsigned integer.  As such, it is advised that user-fonts keep their
  * glyphs in the 0 to 65535 range.  Furthermore, some applications may
  * assume that glyph 0 is a special glyph-not-found glyph.  User-fonts
  * are advised to use glyph 0 for such purposes and do not use that
  * glyph value for other purposes.
  *
  * Returns: %CAIRO_STATUS_SUCCESS upon success,
  * %CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED if fallback options should be tried,
  * or %CAIRO_STATUS_USER_FONT_ERROR or any other error status on error.
  *
  * Since: 1.8
  **/
 typedef cairo_status_t (*cairo_user_scaled_font_unicode_to_glyph_func_t) (cairo_scaled_font_t *scaled_font,
                                       unsigned long        unicode,
                                       unsigned long       *glyph_index);
 
 /* User-font method setters */
 
 cairo_public void
 cairo_user_font_face_set_init_func (cairo_font_face_t                  *font_face,
                     cairo_user_scaled_font_init_func_t  init_func);
 
 cairo_public void
 cairo_user_font_face_set_render_glyph_func (cairo_font_face_t                          *font_face,
                         cairo_user_scaled_font_render_glyph_func_t  render_glyph_func);
 
 cairo_public void
 cairo_user_font_face_set_render_color_glyph_func (cairo_font_face_t                          *font_face,
                                                   cairo_user_scaled_font_render_glyph_func_t  render_glyph_func);
 
 cairo_public void
 cairo_user_font_face_set_text_to_glyphs_func (cairo_font_face_t                            *font_face,
                           cairo_user_scaled_font_text_to_glyphs_func_t  text_to_glyphs_func);
 
 cairo_public void
 cairo_user_font_face_set_unicode_to_glyph_func (cairo_font_face_t                              *font_face,
                             cairo_user_scaled_font_unicode_to_glyph_func_t  unicode_to_glyph_func);
 
 /* User-font method getters */
 
 cairo_public cairo_user_scaled_font_init_func_t
 cairo_user_font_face_get_init_func (cairo_font_face_t *font_face);
 
 cairo_public cairo_user_scaled_font_render_glyph_func_t
 cairo_user_font_face_get_render_glyph_func (cairo_font_face_t *font_face);
 
 cairo_public cairo_user_scaled_font_render_glyph_func_t
 cairo_user_font_face_get_render_color_glyph_func (cairo_font_face_t *font_face);
 
 cairo_public cairo_user_scaled_font_text_to_glyphs_func_t
 cairo_user_font_face_get_text_to_glyphs_func (cairo_font_face_t *font_face);
 
 cairo_public cairo_user_scaled_font_unicode_to_glyph_func_t
 cairo_user_font_face_get_unicode_to_glyph_func (cairo_font_face_t *font_face);
 
 cairo_public cairo_pattern_t *
 cairo_user_scaled_font_get_foreground_marker (cairo_scaled_font_t *scaled_font);
 
 cairo_public cairo_pattern_t *
 cairo_user_scaled_font_get_foreground_source (cairo_scaled_font_t *scaled_font);
 
 /* Query functions */
 
 cairo_public cairo_operator_t
 cairo_get_operator (cairo_t *cr);
 
 cairo_public cairo_pattern_t *
 cairo_get_source (cairo_t *cr);
 
 cairo_public double
 cairo_get_tolerance (cairo_t *cr);
 
 cairo_public cairo_antialias_t
 cairo_get_antialias (cairo_t *cr);
 
 cairo_public cairo_bool_t
 cairo_has_current_point (cairo_t *cr);
 
 cairo_public void
 cairo_get_current_point (cairo_t *cr, double *x, double *y);
 
 cairo_public cairo_fill_rule_t
 cairo_get_fill_rule (cairo_t *cr);
 
 cairo_public double
 cairo_get_line_width (cairo_t *cr);
 
 cairo_public cairo_bool_t
 cairo_get_hairline (cairo_t *cr);
 
 cairo_public cairo_line_cap_t
 cairo_get_line_cap (cairo_t *cr);
 
 cairo_public cairo_line_join_t
 cairo_get_line_join (cairo_t *cr);
 
 cairo_public double
 cairo_get_miter_limit (cairo_t *cr);
 
 cairo_public int
 cairo_get_dash_count (cairo_t *cr);
 
 cairo_public void
 cairo_get_dash (cairo_t *cr, double *dashes, double *offset);
 
 cairo_public void
 cairo_get_matrix (cairo_t *cr, cairo_matrix_t *matrix);
 
 cairo_public cairo_surface_t *
 cairo_get_target (cairo_t *cr);
 
 cairo_public cairo_surface_t *
 cairo_get_group_target (cairo_t *cr);
 
 /**
  * cairo_path_data_type_t:
  * @CAIRO_PATH_MOVE_TO: A move-to operation, since 1.0
  * @CAIRO_PATH_LINE_TO: A line-to operation, since 1.0
  * @CAIRO_PATH_CURVE_TO: A curve-to operation, since 1.0
  * @CAIRO_PATH_CLOSE_PATH: A close-path operation, since 1.0
  *
  * #cairo_path_data_t is used to describe the type of one portion
  * of a path when represented as a #cairo_path_t.
  * See #cairo_path_data_t for details.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_path_data_type {
     CAIRO_PATH_MOVE_TO,
     CAIRO_PATH_LINE_TO,
     CAIRO_PATH_CURVE_TO,
     CAIRO_PATH_CLOSE_PATH
 } cairo_path_data_type_t;
 
 /**
  * cairo_path_data_t:
  *
  * #cairo_path_data_t is used to represent the path data inside a
  * #cairo_path_t.
  *
  * The data structure is designed to try to balance the demands of
  * efficiency and ease-of-use. A path is represented as an array of
  * #cairo_path_data_t, which is a union of headers and points.
  *
  * Each portion of the path is represented by one or more elements in
  * the array, (one header followed by 0 or more points). The length
  * value of the header is the number of array elements for the current
  * portion including the header, (ie. length == 1 + # of points), and
  * where the number of points for each element type is as follows:
  *
  * <programlisting>
  *     %CAIRO_PATH_MOVE_TO:     1 point
  *     %CAIRO_PATH_LINE_TO:     1 point
  *     %CAIRO_PATH_CURVE_TO:    3 points
  *     %CAIRO_PATH_CLOSE_PATH:  0 points
  * </programlisting>
  *
  * The semantics and ordering of the coordinate values are consistent
  * with cairo_move_to(), cairo_line_to(), cairo_curve_to(), and
  * cairo_close_path().
  *
  * Here is sample code for iterating through a #cairo_path_t:
  *
  * <informalexample><programlisting>
  *      int i;
  *      cairo_path_t *path;
  *      cairo_path_data_t *data;
  * &nbsp;
  *      path = cairo_copy_path (cr);
  * &nbsp;
  *      for (i=0; i < path->num_data; i += path->data[i].header.length) {
  *          data = &amp;path->data[i];
  *          switch (data->header.type) {
  *          case CAIRO_PATH_MOVE_TO:
  *              do_move_to_things (data[1].point.x, data[1].point.y);
  *              break;
  *          case CAIRO_PATH_LINE_TO:
  *              do_line_to_things (data[1].point.x, data[1].point.y);
  *              break;
  *          case CAIRO_PATH_CURVE_TO:
  *              do_curve_to_things (data[1].point.x, data[1].point.y,
  *                                  data[2].point.x, data[2].point.y,
  *                                  data[3].point.x, data[3].point.y);
  *              break;
  *          case CAIRO_PATH_CLOSE_PATH:
  *              do_close_path_things ();
  *              break;
  *          }
  *      }
  *      cairo_path_destroy (path);
  * </programlisting></informalexample>
  *
  * As of cairo 1.4, cairo does not mind if there are more elements in
  * a portion of the path than needed.  Such elements can be used by
  * users of the cairo API to hold extra values in the path data
  * structure.  For this reason, it is recommended that applications
  * always use <literal>data->header.length</literal> to
  * iterate over the path data, instead of hardcoding the number of
  * elements for each element type.
  *
  * Since: 1.0
  **/
 typedef union _cairo_path_data_t cairo_path_data_t;
 union _cairo_path_data_t {
     struct {
     cairo_path_data_type_t type;
     int length;
     } header;
     struct {
     double x, y;
     } point;
 };
 
 /**
  * cairo_path_t:
  * @status: the current error status
  * @data: the elements in the path
  * @num_data: the number of elements in the data array
  *
  * A data structure for holding a path. This data structure serves as
  * the return value for cairo_copy_path() and
  * cairo_copy_path_flat() as well the input value for
  * cairo_append_path().
  *
  * See #cairo_path_data_t for hints on how to iterate over the
  * actual data within the path.
  *
  * The num_data member gives the number of elements in the data
  * array. This number is larger than the number of independent path
  * portions (defined in #cairo_path_data_type_t), since the data
  * includes both headers and coordinates for each portion.
  *
  * Since: 1.0
  **/
 typedef struct cairo_path {
     cairo_status_t status;
     cairo_path_data_t *data;
     int num_data;
 } cairo_path_t;
 
 cairo_public cairo_path_t *
 cairo_copy_path (cairo_t *cr);
 
 cairo_public cairo_path_t *
 cairo_copy_path_flat (cairo_t *cr);
 
 cairo_public void
 cairo_append_path (cairo_t      *cr,
            const cairo_path_t   *path);
 
 cairo_public void
 cairo_path_destroy (cairo_path_t *path);
 
 /* Error status queries */
 
 cairo_public cairo_status_t
 cairo_status (cairo_t *cr);
 
 cairo_public const char *
 cairo_status_to_string (cairo_status_t status);
 
 /* Backend device manipulation */
 
 cairo_public cairo_device_t *
 cairo_device_reference (cairo_device_t *device);
 
 /**
  * cairo_device_type_t:
  * @CAIRO_DEVICE_TYPE_DRM: The device is of type Direct Render Manager, since 1.10
  * @CAIRO_DEVICE_TYPE_GL: The device is of type OpenGL, since 1.10
  * @CAIRO_DEVICE_TYPE_SCRIPT: The device is of type script, since 1.10
  * @CAIRO_DEVICE_TYPE_XCB: The device is of type xcb, since 1.10
  * @CAIRO_DEVICE_TYPE_XLIB: The device is of type xlib, since 1.10
  * @CAIRO_DEVICE_TYPE_XML: The device is of type XML, since 1.10
  * @CAIRO_DEVICE_TYPE_COGL: The device is of type cogl, since 1.12
  * @CAIRO_DEVICE_TYPE_WIN32: The device is of type win32, since 1.12
  * @CAIRO_DEVICE_TYPE_INVALID: The device is invalid, since 1.10
  *
  * #cairo_device_type_t is used to describe the type of a given
  * device. The devices types are also known as "backends" within cairo.
  *
  * The device type can be queried with cairo_device_get_type()
  *
  * The various #cairo_device_t functions can be used with devices of
  * any type, but some backends also provide type-specific functions
  * that must only be called with a device of the appropriate
  * type. These functions have names that begin with
  * <literal>cairo_<emphasis>type</emphasis>_device</literal> such as
  * cairo_xcb_device_debug_cap_xrender_version().
  *
  * The behavior of calling a type-specific function with a device of
  * the wrong type is undefined.
  *
  * New entries may be added in future versions.
  *
  * Since: 1.10
  **/
 typedef enum _cairo_device_type {
     CAIRO_DEVICE_TYPE_DRM,
     CAIRO_DEVICE_TYPE_GL,
     CAIRO_DEVICE_TYPE_SCRIPT,
     CAIRO_DEVICE_TYPE_XCB,
     CAIRO_DEVICE_TYPE_XLIB,
     CAIRO_DEVICE_TYPE_XML,
     CAIRO_DEVICE_TYPE_COGL,
     CAIRO_DEVICE_TYPE_WIN32,
 
     CAIRO_DEVICE_TYPE_INVALID = -1
 } cairo_device_type_t;
 
 cairo_public cairo_device_type_t
 cairo_device_get_type (cairo_device_t *device);
 
 cairo_public cairo_status_t
 cairo_device_status (cairo_device_t *device);
 
 cairo_public cairo_status_t
 cairo_device_acquire (cairo_device_t *device);
 
 cairo_public void
 cairo_device_release (cairo_device_t *device);
 
 cairo_public void
 cairo_device_flush (cairo_device_t *device);
 
 cairo_public void
 cairo_device_finish (cairo_device_t *device);
 
 cairo_public void
 cairo_device_destroy (cairo_device_t *device);
 
 cairo_public unsigned int
 cairo_device_get_reference_count (cairo_device_t *device);
 
 cairo_public void *
 cairo_device_get_user_data (cairo_device_t       *device,
                 const cairo_user_data_key_t *key);
 
 cairo_public cairo_status_t
 cairo_device_set_user_data (cairo_device_t       *device,
                 const cairo_user_data_key_t *key,
                 void             *user_data,
                 cairo_destroy_func_t      destroy);
 
 
 /* Surface manipulation */
 
 cairo_public cairo_surface_t *
 cairo_surface_create_similar (cairo_surface_t  *other,
                   cairo_content_t   content,
                   int       width,
                   int       height);
 
 cairo_public cairo_surface_t *
 cairo_surface_create_similar_image (cairo_surface_t  *other,
                     cairo_format_t    format,
                     int     width,
                     int     height);
 
 cairo_public cairo_surface_t *
 cairo_surface_map_to_image (cairo_surface_t  *surface,
                 const cairo_rectangle_int_t *extents);
 
 cairo_public void
 cairo_surface_unmap_image (cairo_surface_t *surface,
                cairo_surface_t *image);
 
 cairo_public cairo_surface_t *
 cairo_surface_create_for_rectangle (cairo_surface_t *target,
                                     double       x,
                                     double       y,
                                     double       width,
                                     double       height);
 
 /**
  * cairo_surface_observer_mode_t:
  * @CAIRO_SURFACE_OBSERVER_NORMAL: no recording is done
  * @CAIRO_SURFACE_OBSERVER_RECORD_OPERATIONS: operations are recorded
  *
  * Whether operations should be recorded.
  *
  * Since: 1.12
  **/
 typedef enum {
     CAIRO_SURFACE_OBSERVER_NORMAL = 0,
     CAIRO_SURFACE_OBSERVER_RECORD_OPERATIONS = 0x1
 } cairo_surface_observer_mode_t;
 
 cairo_public cairo_surface_t *
 cairo_surface_create_observer (cairo_surface_t *target,
                    cairo_surface_observer_mode_t mode);
 
 /**
  * cairo_surface_observer_callback_t:
  * @observer: the #cairo_surface_observer_t
  * @target: the observed surface
  * @data: closure used when adding the callback
  *
  * A generic callback function for surface operations.
  *
  * Since: 1.12
  **/
 typedef void (*cairo_surface_observer_callback_t) (cairo_surface_t *observer,
                            cairo_surface_t *target,
                            void *data);
 
 cairo_public cairo_status_t
 cairo_surface_observer_add_paint_callback (cairo_surface_t *abstract_surface,
                        cairo_surface_observer_callback_t func,
                        void *data);
 
 cairo_public cairo_status_t
 cairo_surface_observer_add_mask_callback (cairo_surface_t *abstract_surface,
                       cairo_surface_observer_callback_t func,
                       void *data);
 
 cairo_public cairo_status_t
 cairo_surface_observer_add_fill_callback (cairo_surface_t *abstract_surface,
                       cairo_surface_observer_callback_t func,
                       void *data);
 
 cairo_public cairo_status_t
 cairo_surface_observer_add_stroke_callback (cairo_surface_t *abstract_surface,
                         cairo_surface_observer_callback_t func,
                         void *data);
 
 cairo_public cairo_status_t
 cairo_surface_observer_add_glyphs_callback (cairo_surface_t *abstract_surface,
                         cairo_surface_observer_callback_t func,
                         void *data);
 
 cairo_public cairo_status_t
 cairo_surface_observer_add_flush_callback (cairo_surface_t *abstract_surface,
                        cairo_surface_observer_callback_t func,
                        void *data);
 
 cairo_public cairo_status_t
 cairo_surface_observer_add_finish_callback (cairo_surface_t *abstract_surface,
                         cairo_surface_observer_callback_t func,
                         void *data);
 
 cairo_public cairo_status_t
 cairo_surface_observer_print (cairo_surface_t *abstract_surface,
                   cairo_write_func_t write_func,
                   void *closure);
 cairo_public double
 cairo_surface_observer_elapsed (cairo_surface_t *abstract_surface);
 
 cairo_public cairo_status_t
 cairo_device_observer_print (cairo_device_t *abstract_device,
                  cairo_write_func_t write_func,
                  void *closure);
 
 cairo_public double
 cairo_device_observer_elapsed (cairo_device_t *abstract_device);
 
 cairo_public double
 cairo_device_observer_paint_elapsed (cairo_device_t *abstract_device);
 
 cairo_public double
 cairo_device_observer_mask_elapsed (cairo_device_t *abstract_device);
 
 cairo_public double
 cairo_device_observer_fill_elapsed (cairo_device_t *abstract_device);
 
 cairo_public double
 cairo_device_observer_stroke_elapsed (cairo_device_t *abstract_device);
 
 cairo_public double
 cairo_device_observer_glyphs_elapsed (cairo_device_t *abstract_device);
 
 cairo_public cairo_surface_t *
 cairo_surface_reference (cairo_surface_t *surface);
 
 cairo_public void
 cairo_surface_finish (cairo_surface_t *surface);
 
 cairo_public void
 cairo_surface_destroy (cairo_surface_t *surface);
 
 cairo_public cairo_device_t *
 cairo_surface_get_device (cairo_surface_t *surface);
 
 cairo_public unsigned int
 cairo_surface_get_reference_count (cairo_surface_t *surface);
 
 cairo_public cairo_status_t
 cairo_surface_status (cairo_surface_t *surface);
 
 /**
  * cairo_surface_type_t:
  * @CAIRO_SURFACE_TYPE_IMAGE: The surface is of type image, since 1.2
  * @CAIRO_SURFACE_TYPE_PDF: The surface is of type pdf, since 1.2
  * @CAIRO_SURFACE_TYPE_PS: The surface is of type ps, since 1.2
  * @CAIRO_SURFACE_TYPE_XLIB: The surface is of type xlib, since 1.2
  * @CAIRO_SURFACE_TYPE_XCB: The surface is of type xcb, since 1.2
  * @CAIRO_SURFACE_TYPE_GLITZ: The surface is of type glitz, since 1.2, deprecated 1.18
  *   (glitz support have been removed, this surface type will never be set by cairo)
  * @CAIRO_SURFACE_TYPE_QUARTZ: The surface is of type quartz, since 1.2
  * @CAIRO_SURFACE_TYPE_WIN32: The surface is of type win32, since 1.2
  * @CAIRO_SURFACE_TYPE_BEOS: The surface is of type beos, since 1.2, deprecated 1.18
  *   (beos support have been removed, this surface type will never be set by cairo)
  * @CAIRO_SURFACE_TYPE_DIRECTFB: The surface is of type directfb, since 1.2, deprecated 1.18
  *   (directfb support have been removed, this surface type will never be set by cairo)
  * @CAIRO_SURFACE_TYPE_SVG: The surface is of type svg, since 1.2
  * @CAIRO_SURFACE_TYPE_OS2: The surface is of type os2, since 1.4, deprecated 1.18
  *   (os2 support have been removed, this surface type will never be set by cairo)
  * @CAIRO_SURFACE_TYPE_WIN32_PRINTING: The surface is a win32 printing surface, since 1.6
  * @CAIRO_SURFACE_TYPE_QUARTZ_IMAGE: The surface is of type quartz_image, since 1.6
  * @CAIRO_SURFACE_TYPE_SCRIPT: The surface is of type script, since 1.10
  * @CAIRO_SURFACE_TYPE_QT: The surface is of type Qt, since 1.10, deprecated 1.18
  *   (Ot support have been removed, this surface type will never be set by cairo)
  * @CAIRO_SURFACE_TYPE_RECORDING: The surface is of type recording, since 1.10
  * @CAIRO_SURFACE_TYPE_VG: The surface is a OpenVG surface, since 1.10, deprecated 1.18
  *   (OpenVG support have been removed, this surface type will never be set by cairo)
  * @CAIRO_SURFACE_TYPE_GL: The surface is of type OpenGL, since 1.10, deprecated 1.18
  *   (OpenGL support have been removed, this surface type will never be set by cairo)
  * @CAIRO_SURFACE_TYPE_DRM: The surface is of type Direct Render Manager, since 1.10, deprecated 1.18
  *   (DRM support have been removed, this surface type will never be set by cairo)
  * @CAIRO_SURFACE_TYPE_TEE: The surface is of type 'tee' (a multiplexing surface), since 1.10
  * @CAIRO_SURFACE_TYPE_XML: The surface is of type XML (for debugging), since 1.10
  * @CAIRO_SURFACE_TYPE_SKIA: The surface is of type Skia, since 1.10, deprecated 1.18
  *   (Skia support have been removed, this surface type will never be set by cairo)
  * @CAIRO_SURFACE_TYPE_SUBSURFACE: The surface is a subsurface created with
  *   cairo_surface_create_for_rectangle(), since 1.10
  * @CAIRO_SURFACE_TYPE_COGL: This surface is of type Cogl, since 1.12, deprecated 1.18
  *   (Cogl support have been removed, this surface type will never be set by cairo)
  *
  * #cairo_surface_type_t is used to describe the type of a given
  * surface. The surface types are also known as "backends" or "surface
  * backends" within cairo.
  *
  * The type of a surface is determined by the function used to create
  * it, which will generally be of the form
  * <function>cairo_<emphasis>type</emphasis>_surface_create(<!-- -->)</function>,
  * (though see cairo_surface_create_similar() as well).
  *
  * The surface type can be queried with cairo_surface_get_type()
  *
  * The various #cairo_surface_t functions can be used with surfaces of
  * any type, but some backends also provide type-specific functions
  * that must only be called with a surface of the appropriate
  * type. These functions have names that begin with
  * <literal>cairo_<emphasis>type</emphasis>_surface</literal> such as cairo_image_surface_get_width().
  *
  * The behavior of calling a type-specific function with a surface of
  * the wrong type is undefined.
  *
  * New entries may be added in future versions.
  *
  * Since: 1.2
  **/
 typedef enum _cairo_surface_type {
     CAIRO_SURFACE_TYPE_IMAGE,
     CAIRO_SURFACE_TYPE_PDF,
     CAIRO_SURFACE_TYPE_PS,
     CAIRO_SURFACE_TYPE_XLIB,
     CAIRO_SURFACE_TYPE_XCB,
     CAIRO_SURFACE_TYPE_GLITZ,
     CAIRO_SURFACE_TYPE_QUARTZ,
     CAIRO_SURFACE_TYPE_WIN32,
     CAIRO_SURFACE_TYPE_BEOS,
     CAIRO_SURFACE_TYPE_DIRECTFB,
     CAIRO_SURFACE_TYPE_SVG,
     CAIRO_SURFACE_TYPE_OS2,
     CAIRO_SURFACE_TYPE_WIN32_PRINTING,
     CAIRO_SURFACE_TYPE_QUARTZ_IMAGE,
     CAIRO_SURFACE_TYPE_SCRIPT,
     CAIRO_SURFACE_TYPE_QT,
     CAIRO_SURFACE_TYPE_RECORDING,
     CAIRO_SURFACE_TYPE_VG,
     CAIRO_SURFACE_TYPE_GL,
     CAIRO_SURFACE_TYPE_DRM,
     CAIRO_SURFACE_TYPE_TEE,
     CAIRO_SURFACE_TYPE_XML,
     CAIRO_SURFACE_TYPE_SKIA,
     CAIRO_SURFACE_TYPE_SUBSURFACE,
     CAIRO_SURFACE_TYPE_COGL
 } cairo_surface_type_t;
 
 cairo_public cairo_surface_type_t
 cairo_surface_get_type (cairo_surface_t *surface);
 
 cairo_public cairo_content_t
 cairo_surface_get_content (cairo_surface_t *surface);
 
 #if CAIRO_HAS_PNG_FUNCTIONS
 
 cairo_public cairo_status_t
 cairo_surface_write_to_png (cairo_surface_t *surface,
                 const char      *filename);
 
 cairo_public cairo_status_t
 cairo_surface_write_to_png_stream (cairo_surface_t  *surface,
                    cairo_write_func_t   write_func,
                    void         *closure);
 
 #endif
 
 cairo_public void *
 cairo_surface_get_user_data (cairo_surface_t         *surface,
                  const cairo_user_data_key_t *key);
 
 cairo_public cairo_status_t
 cairo_surface_set_user_data (cairo_surface_t         *surface,
                  const cairo_user_data_key_t *key,
                  void            *user_data,
                  cairo_destroy_func_t    destroy);
 
 #define CAIRO_MIME_TYPE_JPEG "image/jpeg"
 #define CAIRO_MIME_TYPE_PNG "image/png"
 #define CAIRO_MIME_TYPE_JP2 "image/jp2"
 #define CAIRO_MIME_TYPE_URI "text/x-uri"
 #define CAIRO_MIME_TYPE_UNIQUE_ID "application/x-cairo.uuid"
 #define CAIRO_MIME_TYPE_JBIG2 "application/x-cairo.jbig2"
 #define CAIRO_MIME_TYPE_JBIG2_GLOBAL "application/x-cairo.jbig2-global"
 #define CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID "application/x-cairo.jbig2-global-id"
 #define CAIRO_MIME_TYPE_CCITT_FAX "image/g3fax"
 #define CAIRO_MIME_TYPE_CCITT_FAX_PARAMS "application/x-cairo.ccitt.params"
 #define CAIRO_MIME_TYPE_EPS "application/postscript"
 #define CAIRO_MIME_TYPE_EPS_PARAMS "application/x-cairo.eps.params"
 
 cairo_public void
 cairo_surface_get_mime_data (cairo_surface_t        *surface,
                              const char         *mime_type,
                              const unsigned char       **data,
                              unsigned long      *length);
 
 cairo_public cairo_status_t
 cairo_surface_set_mime_data (cairo_surface_t        *surface,
                              const char         *mime_type,
                              const unsigned char    *data,
                              unsigned long       length,
                  cairo_destroy_func_t    destroy,
                  void           *closure);
 
 cairo_public cairo_bool_t
 cairo_surface_supports_mime_type (cairo_surface_t       *surface,
                   const char                *mime_type);
 
 cairo_public void
 cairo_surface_get_font_options (cairo_surface_t      *surface,
                 cairo_font_options_t *options);
 
 cairo_public void
 cairo_surface_flush (cairo_surface_t *surface);
 
 cairo_public void
 cairo_surface_mark_dirty (cairo_surface_t *surface);
 
 cairo_public void
 cairo_surface_mark_dirty_rectangle (cairo_surface_t *surface,
                     int              x,
                     int              y,
                     int              width,
                     int              height);
 
 cairo_public void
 cairo_surface_set_device_scale (cairo_surface_t *surface,
                 double           x_scale,
                 double           y_scale);
 
 cairo_public void
 cairo_surface_get_device_scale (cairo_surface_t *surface,
                 double          *x_scale,
                 double          *y_scale);
 
 cairo_public void
 cairo_surface_set_device_offset (cairo_surface_t *surface,
                  double           x_offset,
                  double           y_offset);
 
 cairo_public void
 cairo_surface_get_device_offset (cairo_surface_t *surface,
                  double          *x_offset,
                  double          *y_offset);
 
 cairo_public void
 cairo_surface_set_fallback_resolution (cairo_surface_t  *surface,
                        double        x_pixels_per_inch,
                        double        y_pixels_per_inch);
 
 cairo_public void
 cairo_surface_get_fallback_resolution (cairo_surface_t  *surface,
                        double       *x_pixels_per_inch,
                        double       *y_pixels_per_inch);
 
 cairo_public void
 cairo_surface_copy_page (cairo_surface_t *surface);
 
 cairo_public void
 cairo_surface_show_page (cairo_surface_t *surface);
 
 cairo_public cairo_bool_t
 cairo_surface_has_show_text_glyphs (cairo_surface_t *surface);
 
 /* Image-surface functions */
 
 cairo_public cairo_surface_t *
 cairo_image_surface_create (cairo_format_t  format,
                 int         width,
                 int         height);
 
 cairo_public int
 cairo_format_stride_for_width (cairo_format_t   format,
                    int      width);
 
 cairo_public cairo_surface_t *
 cairo_image_surface_create_for_data (unsigned char         *data,
                      cairo_format_t     format,
                      int            width,
                      int            height,
                      int            stride);
 
 cairo_public unsigned char *
 cairo_image_surface_get_data (cairo_surface_t *surface);
 
 cairo_public cairo_format_t
 cairo_image_surface_get_format (cairo_surface_t *surface);
 
 cairo_public int
 cairo_image_surface_get_width (cairo_surface_t *surface);
 
 cairo_public int
 cairo_image_surface_get_height (cairo_surface_t *surface);
 
 cairo_public int
 cairo_image_surface_get_stride (cairo_surface_t *surface);
 
 #if CAIRO_HAS_PNG_FUNCTIONS
 
 cairo_public cairo_surface_t *
 cairo_image_surface_create_from_png (const char *filename);
 
 cairo_public cairo_surface_t *
 cairo_image_surface_create_from_png_stream (cairo_read_func_t   read_func,
                         void        *closure);
 
 #endif
 
 /* Recording-surface functions */
 
 cairo_public cairo_surface_t *
 cairo_recording_surface_create (cairo_content_t      content,
                                 const cairo_rectangle_t *extents);
 
 cairo_public void
 cairo_recording_surface_ink_extents (cairo_surface_t *surface,
                                      double *x0,
                                      double *y0,
                                      double *width,
                                      double *height);
 
 cairo_public cairo_bool_t
 cairo_recording_surface_get_extents (cairo_surface_t *surface,
                      cairo_rectangle_t *extents);
 
 /* raster-source pattern (callback) functions */
 
 /**
  * cairo_raster_source_acquire_func_t:
  * @pattern: the pattern being rendered from
  * @callback_data: the user data supplied during creation
  * @target: the rendering target surface
  * @extents: rectangular region of interest in pixels in sample space
  *
  * #cairo_raster_source_acquire_func_t is the type of function which is
  * called when a pattern is being rendered from. It should create a surface
  * that provides the pixel data for the region of interest as defined by
  * extents, though the surface itself does not have to be limited to that
  * area. For convenience the surface should probably be of image type,
  * created with cairo_surface_create_similar_image() for the target (which
  * enables the number of copies to be reduced during transfer to the
  * device). Another option, might be to return a similar surface to the
  * target for explicit handling by the application of a set of cached sources
  * on the device. The region of sample data provided should be defined using
  * cairo_surface_set_device_offset() to specify the top-left corner of the
  * sample data (along with width and height of the surface).
  *
  * Returns: a #cairo_surface_t
  *
  * Since: 1.12
  **/
 typedef cairo_surface_t *
 (*cairo_raster_source_acquire_func_t) (cairo_pattern_t *pattern,
                        void *callback_data,
                        cairo_surface_t *target,
                        const cairo_rectangle_int_t *extents);
 
 /**
  * cairo_raster_source_release_func_t:
  * @pattern: the pattern being rendered from
  * @callback_data: the user data supplied during creation
  * @surface: the surface created during acquire
  *
  * #cairo_raster_source_release_func_t is the type of function which is
  * called when the pixel data is no longer being access by the pattern
  * for the rendering operation. Typically this function will simply
  * destroy the surface created during acquire.
  *
  * Since: 1.12
  **/
 typedef void
 (*cairo_raster_source_release_func_t) (cairo_pattern_t *pattern,
                        void *callback_data,
                        cairo_surface_t *surface);
 
 /**
  * cairo_raster_source_snapshot_func_t:
  * @pattern: the pattern being rendered from
  * @callback_data: the user data supplied during creation
  *
  * #cairo_raster_source_snapshot_func_t is the type of function which is
  * called when the pixel data needs to be preserved for later use
  * during printing. This pattern will be accessed again later, and it
  * is expected to provide the pixel data that was current at the time
  * of snapshotting.
  *
  * Return value: CAIRO_STATUS_SUCCESS on success, or one of the
  * #cairo_status_t error codes for failure.
  *
  * Since: 1.12
  **/
 typedef cairo_status_t
 (*cairo_raster_source_snapshot_func_t) (cairo_pattern_t *pattern,
                     void *callback_data);
 
 /**
  * cairo_raster_source_copy_func_t:
  * @pattern: the #cairo_pattern_t that was copied to
  * @callback_data: the user data supplied during creation
  * @other: the #cairo_pattern_t being used as the source for the copy
  *
  * #cairo_raster_source_copy_func_t is the type of function which is
  * called when the pattern gets copied as a normal part of rendering.
  *
  * Return value: CAIRO_STATUS_SUCCESS on success, or one of the
  * #cairo_status_t error codes for failure.
  *
  * Since: 1.12
  **/
 typedef cairo_status_t
 (*cairo_raster_source_copy_func_t) (cairo_pattern_t *pattern,
                     void *callback_data,
                     const cairo_pattern_t *other);
 
 /**
  * cairo_raster_source_finish_func_t:
  * @pattern: the pattern being rendered from
  * @callback_data: the user data supplied during creation
  *
  * #cairo_raster_source_finish_func_t is the type of function which is
  * called when the pattern (or a copy thereof) is no longer required.
  *
  * Since: 1.12
  **/
 typedef void
 (*cairo_raster_source_finish_func_t) (cairo_pattern_t *pattern,
                       void *callback_data);
 
 cairo_public cairo_pattern_t *
 cairo_pattern_create_raster_source (void *user_data,
                     cairo_content_t content,
                     int width, int height);
 
 cairo_public void
 cairo_raster_source_pattern_set_callback_data (cairo_pattern_t *pattern,
                            void *data);
 
 cairo_public void *
 cairo_raster_source_pattern_get_callback_data (cairo_pattern_t *pattern);
 
 cairo_public void
 cairo_raster_source_pattern_set_acquire (cairo_pattern_t *pattern,
                      cairo_raster_source_acquire_func_t acquire,
                      cairo_raster_source_release_func_t release);
 
 cairo_public void
 cairo_raster_source_pattern_get_acquire (cairo_pattern_t *pattern,
                      cairo_raster_source_acquire_func_t *acquire,
                      cairo_raster_source_release_func_t *release);
 cairo_public void
 cairo_raster_source_pattern_set_snapshot (cairo_pattern_t *pattern,
                       cairo_raster_source_snapshot_func_t snapshot);
 
 cairo_public cairo_raster_source_snapshot_func_t
 cairo_raster_source_pattern_get_snapshot (cairo_pattern_t *pattern);
 
 cairo_public void
 cairo_raster_source_pattern_set_copy (cairo_pattern_t *pattern,
                       cairo_raster_source_copy_func_t copy);
 
 cairo_public cairo_raster_source_copy_func_t
 cairo_raster_source_pattern_get_copy (cairo_pattern_t *pattern);
 
 cairo_public void
 cairo_raster_source_pattern_set_finish (cairo_pattern_t *pattern,
                     cairo_raster_source_finish_func_t finish);
 
 cairo_public cairo_raster_source_finish_func_t
 cairo_raster_source_pattern_get_finish (cairo_pattern_t *pattern);
 
 /* Pattern creation functions */
 
 cairo_public cairo_pattern_t *
 cairo_pattern_create_rgb (double red, double green, double blue);
 
 cairo_public cairo_pattern_t *
 cairo_pattern_create_rgba (double red, double green, double blue,
                double alpha);
 
 cairo_public cairo_pattern_t *
 cairo_pattern_create_for_surface (cairo_surface_t *surface);
 
 cairo_public cairo_pattern_t *
 cairo_pattern_create_linear (double x0, double y0,
                  double x1, double y1);
 
 cairo_public cairo_pattern_t *
 cairo_pattern_create_radial (double cx0, double cy0, double radius0,
                  double cx1, double cy1, double radius1);
 
 cairo_public cairo_pattern_t *
 cairo_pattern_create_mesh (void);
 
 cairo_public cairo_pattern_t *
 cairo_pattern_reference (cairo_pattern_t *pattern);
 
 cairo_public void
 cairo_pattern_destroy (cairo_pattern_t *pattern);
 
 cairo_public unsigned int
 cairo_pattern_get_reference_count (cairo_pattern_t *pattern);
 
 cairo_public cairo_status_t
 cairo_pattern_status (cairo_pattern_t *pattern);
 
 cairo_public void *
 cairo_pattern_get_user_data (cairo_pattern_t         *pattern,
                  const cairo_user_data_key_t *key);
 
 cairo_public cairo_status_t
 cairo_pattern_set_user_data (cairo_pattern_t         *pattern,
                  const cairo_user_data_key_t *key,
                  void            *user_data,
                  cairo_destroy_func_t     destroy);
 
 /**
  * cairo_pattern_type_t:
  * @CAIRO_PATTERN_TYPE_SOLID: The pattern is a solid (uniform)
  * color. It may be opaque or translucent, since 1.2.
  * @CAIRO_PATTERN_TYPE_SURFACE: The pattern is a based on a surface (an image), since 1.2.
  * @CAIRO_PATTERN_TYPE_LINEAR: The pattern is a linear gradient, since 1.2.
  * @CAIRO_PATTERN_TYPE_RADIAL: The pattern is a radial gradient, since 1.2.
  * @CAIRO_PATTERN_TYPE_MESH: The pattern is a mesh, since 1.12.
  * @CAIRO_PATTERN_TYPE_RASTER_SOURCE: The pattern is a user pattern providing raster data, since 1.12.
  *
  * #cairo_pattern_type_t is used to describe the type of a given pattern.
  *
  * The type of a pattern is determined by the function used to create
  * it. The cairo_pattern_create_rgb() and cairo_pattern_create_rgba()
  * functions create SOLID patterns. The remaining
  * cairo_pattern_create<!-- --> functions map to pattern types in obvious
  * ways.
  *
  * The pattern type can be queried with cairo_pattern_get_type()
  *
  * Most #cairo_pattern_t functions can be called with a pattern of any
  * type, (though trying to change the extend or filter for a solid
  * pattern will have no effect). A notable exception is
  * cairo_pattern_add_color_stop_rgb() and
  * cairo_pattern_add_color_stop_rgba() which must only be called with
  * gradient patterns (either LINEAR or RADIAL). Otherwise the pattern
  * will be shutdown and put into an error state.
  *
  * New entries may be added in future versions.
  *
  * Since: 1.2
  **/
 typedef enum _cairo_pattern_type {
     CAIRO_PATTERN_TYPE_SOLID,
     CAIRO_PATTERN_TYPE_SURFACE,
     CAIRO_PATTERN_TYPE_LINEAR,
     CAIRO_PATTERN_TYPE_RADIAL,
     CAIRO_PATTERN_TYPE_MESH,
     CAIRO_PATTERN_TYPE_RASTER_SOURCE
 } cairo_pattern_type_t;
 
 cairo_public cairo_pattern_type_t
 cairo_pattern_get_type (cairo_pattern_t *pattern);
 
 cairo_public void
 cairo_pattern_add_color_stop_rgb (cairo_pattern_t *pattern,
                   double offset,
                   double red, double green, double blue);
 
 cairo_public void
 cairo_pattern_add_color_stop_rgba (cairo_pattern_t *pattern,
                    double offset,
                    double red, double green, double blue,
                    double alpha);
 
 cairo_public void
 cairo_mesh_pattern_begin_patch (cairo_pattern_t *pattern);
 
 cairo_public void
 cairo_mesh_pattern_end_patch (cairo_pattern_t *pattern);
 
 cairo_public void
 cairo_mesh_pattern_curve_to (cairo_pattern_t *pattern,
                  double x1, double y1,
                  double x2, double y2,
                  double x3, double y3);
 
 cairo_public void
 cairo_mesh_pattern_line_to (cairo_pattern_t *pattern,
                 double x, double y);
 
 cairo_public void
 cairo_mesh_pattern_move_to (cairo_pattern_t *pattern,
                 double x, double y);
 
 cairo_public void
 cairo_mesh_pattern_set_control_point (cairo_pattern_t *pattern,
                       unsigned int point_num,
                       double x, double y);
 
 cairo_public void
 cairo_mesh_pattern_set_corner_color_rgb (cairo_pattern_t *pattern,
                      unsigned int corner_num,
                      double red, double green, double blue);
 
 cairo_public void
 cairo_mesh_pattern_set_corner_color_rgba (cairo_pattern_t *pattern,
                       unsigned int corner_num,
                       double red, double green, double blue,
                       double alpha);
 
 cairo_public void
 cairo_pattern_set_matrix (cairo_pattern_t      *pattern,
               const cairo_matrix_t *matrix);
 
 cairo_public void
 cairo_pattern_get_matrix (cairo_pattern_t *pattern,
               cairo_matrix_t  *matrix);
 
 /**
  * cairo_extend_t:
  * @CAIRO_EXTEND_NONE: pixels outside of the source pattern
  *   are fully transparent (Since 1.0)
  * @CAIRO_EXTEND_REPEAT: the pattern is tiled by repeating (Since 1.0)
  * @CAIRO_EXTEND_REFLECT: the pattern is tiled by reflecting
  *   at the edges (Since 1.0; but only implemented for surface patterns since 1.6)
  * @CAIRO_EXTEND_PAD: pixels outside of the pattern copy
  *   the closest pixel from the source (Since 1.2; but only
  *   implemented for surface patterns since 1.6)
  *
  * #cairo_extend_t is used to describe how pattern color/alpha will be
  * determined for areas "outside" the pattern's natural area, (for
  * example, outside the surface bounds or outside the gradient
  * geometry).
  *
  * Mesh patterns are not affected by the extend mode.
  *
  * The default extend mode is %CAIRO_EXTEND_NONE for surface patterns
  * and %CAIRO_EXTEND_PAD for gradient patterns.
  *
  * New entries may be added in future versions.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_extend {
     CAIRO_EXTEND_NONE,
     CAIRO_EXTEND_REPEAT,
     CAIRO_EXTEND_REFLECT,
     CAIRO_EXTEND_PAD
 } cairo_extend_t;
 
 cairo_public void
 cairo_pattern_set_extend (cairo_pattern_t *pattern, cairo_extend_t extend);
 
 cairo_public cairo_extend_t
 cairo_pattern_get_extend (cairo_pattern_t *pattern);
 
 /**
  * cairo_filter_t:
  * @CAIRO_FILTER_FAST: A high-performance filter, with quality similar
  *     to %CAIRO_FILTER_NEAREST (Since 1.0)
  * @CAIRO_FILTER_GOOD: A reasonable-performance filter, with quality
  *     similar to %CAIRO_FILTER_BILINEAR (Since 1.0)
  * @CAIRO_FILTER_BEST: The highest-quality available, performance may
  *     not be suitable for interactive use. (Since 1.0)
  * @CAIRO_FILTER_NEAREST: Nearest-neighbor filtering (Since 1.0)
  * @CAIRO_FILTER_BILINEAR: Linear interpolation in two dimensions (Since 1.0)
  * @CAIRO_FILTER_GAUSSIAN: This filter value is currently
  *     unimplemented, and should not be used in current code. (Since 1.0)
  *
  * #cairo_filter_t is used to indicate what filtering should be
  * applied when reading pixel values from patterns. See
  * cairo_pattern_set_filter() for indicating the desired filter to be
  * used with a particular pattern.
  *
  * Since: 1.0
  **/
 typedef enum _cairo_filter {
     CAIRO_FILTER_FAST,
     CAIRO_FILTER_GOOD,
     CAIRO_FILTER_BEST,
     CAIRO_FILTER_NEAREST,
     CAIRO_FILTER_BILINEAR,
     CAIRO_FILTER_GAUSSIAN
 } cairo_filter_t;
 
 cairo_public void
 cairo_pattern_set_filter (cairo_pattern_t *pattern, cairo_filter_t filter);
 
 cairo_public cairo_filter_t
 cairo_pattern_get_filter (cairo_pattern_t *pattern);
 
 cairo_public cairo_status_t
 cairo_pattern_get_rgba (cairo_pattern_t *pattern,
             double *red, double *green,
             double *blue, double *alpha);
 
 cairo_public cairo_status_t
 cairo_pattern_get_surface (cairo_pattern_t *pattern,
                cairo_surface_t **surface);
 
 
 cairo_public cairo_status_t
 cairo_pattern_get_color_stop_rgba (cairo_pattern_t *pattern,
                    int index, double *offset,
                    double *red, double *green,
                    double *blue, double *alpha);
 
 cairo_public cairo_status_t
 cairo_pattern_get_color_stop_count (cairo_pattern_t *pattern,
                     int *count);
 
 cairo_public cairo_status_t
 cairo_pattern_get_linear_points (cairo_pattern_t *pattern,
                  double *x0, double *y0,
                  double *x1, double *y1);
 
 cairo_public cairo_status_t
 cairo_pattern_get_radial_circles (cairo_pattern_t *pattern,
                   double *x0, double *y0, double *r0,
                   double *x1, double *y1, double *r1);
 
 cairo_public cairo_status_t
 cairo_mesh_pattern_get_patch_count (cairo_pattern_t *pattern,
                     unsigned int *count);
 
 cairo_public cairo_path_t *
 cairo_mesh_pattern_get_path (cairo_pattern_t *pattern,
                  unsigned int patch_num);
 
 cairo_public cairo_status_t
 cairo_mesh_pattern_get_corner_color_rgba (cairo_pattern_t *pattern,
                       unsigned int patch_num,
                       unsigned int corner_num,
                       double *red, double *green,
                       double *blue, double *alpha);
 
 cairo_public cairo_status_t
 cairo_mesh_pattern_get_control_point (cairo_pattern_t *pattern,
                       unsigned int patch_num,
                       unsigned int point_num,
                       double *x, double *y);
 
 /* Matrix functions */
 
 cairo_public void
 cairo_matrix_init (cairo_matrix_t *matrix,
            double  xx, double  yx,
            double  xy, double  yy,
            double  x0, double  y0);
 
 cairo_public void
 cairo_matrix_init_identity (cairo_matrix_t *matrix);
 
 cairo_public void
 cairo_matrix_init_translate (cairo_matrix_t *matrix,
                  double tx, double ty);
 
 cairo_public void
 cairo_matrix_init_scale (cairo_matrix_t *matrix,
              double sx, double sy);
 
 cairo_public void
 cairo_matrix_init_rotate (cairo_matrix_t *matrix,
               double radians);
 
 cairo_public void
 cairo_matrix_translate (cairo_matrix_t *matrix, double tx, double ty);
 
 cairo_public void
 cairo_matrix_scale (cairo_matrix_t *matrix, double sx, double sy);
 
 cairo_public void
 cairo_matrix_rotate (cairo_matrix_t *matrix, double radians);
 
 cairo_public cairo_status_t
 cairo_matrix_invert (cairo_matrix_t *matrix);
 
 cairo_public void
 cairo_matrix_multiply (cairo_matrix_t       *result,
                const cairo_matrix_t *a,
                const cairo_matrix_t *b);
 
 cairo_public void
 cairo_matrix_transform_distance (const cairo_matrix_t *matrix,
                  double *dx, double *dy);
 
 cairo_public void
 cairo_matrix_transform_point (const cairo_matrix_t *matrix,
                   double *x, double *y);
 
 /* Region functions */
 
 /**
  * cairo_region_t:
  *
  * A #cairo_region_t represents a set of integer-aligned rectangles.
  *
  * It allows set-theoretical operations like cairo_region_union() and
  * cairo_region_intersect() to be performed on them.
  *
  * Memory management of #cairo_region_t is done with
  * cairo_region_reference() and cairo_region_destroy().
  *
  * Since: 1.10
  **/
 typedef struct _cairo_region cairo_region_t;
 
 /**
  * cairo_region_overlap_t:
  * @CAIRO_REGION_OVERLAP_IN: The contents are entirely inside the region. (Since 1.10)
  * @CAIRO_REGION_OVERLAP_OUT: The contents are entirely outside the region. (Since 1.10)
  * @CAIRO_REGION_OVERLAP_PART: The contents are partially inside and
  *     partially outside the region. (Since 1.10)
  *
  * Used as the return value for cairo_region_contains_rectangle().
  *
  * Since: 1.10
  **/
 typedef enum _cairo_region_overlap {
     CAIRO_REGION_OVERLAP_IN,        /* completely inside region */
     CAIRO_REGION_OVERLAP_OUT,       /* completely outside region */
     CAIRO_REGION_OVERLAP_PART       /* partly inside region */
 } cairo_region_overlap_t;
 
 cairo_public cairo_region_t *
 cairo_region_create (void);
 
 cairo_public cairo_region_t *
 cairo_region_create_rectangle (const cairo_rectangle_int_t *rectangle);
 
 cairo_public cairo_region_t *
 cairo_region_create_rectangles (const cairo_rectangle_int_t *rects,
                 int count);
 
 cairo_public cairo_region_t *
 cairo_region_copy (const cairo_region_t *original);
 
 cairo_public cairo_region_t *
 cairo_region_reference (cairo_region_t *region);
 
 cairo_public void
 cairo_region_destroy (cairo_region_t *region);
 
 cairo_public cairo_bool_t
 cairo_region_equal (const cairo_region_t *a, const cairo_region_t *b);
 
 cairo_public cairo_status_t
 cairo_region_status (const cairo_region_t *region);
 
 cairo_public void
 cairo_region_get_extents (const cairo_region_t        *region,
               cairo_rectangle_int_t *extents);
 
 cairo_public int
 cairo_region_num_rectangles (const cairo_region_t *region);
 
 cairo_public void
 cairo_region_get_rectangle (const cairo_region_t  *region,
                 int                    nth,
                 cairo_rectangle_int_t *rectangle);
 
 cairo_public cairo_bool_t
 cairo_region_is_empty (const cairo_region_t *region);
 
 cairo_public cairo_region_overlap_t
 cairo_region_contains_rectangle (const cairo_region_t *region,
                  const cairo_rectangle_int_t *rectangle);
 
 cairo_public cairo_bool_t
 cairo_region_contains_point (const cairo_region_t *region, int x, int y);
 
 cairo_public void
 cairo_region_translate (cairo_region_t *region, int dx, int dy);
 
 cairo_public cairo_status_t
 cairo_region_subtract (cairo_region_t *dst, const cairo_region_t *other);
 
 cairo_public cairo_status_t
 cairo_region_subtract_rectangle (cairo_region_t *dst,
                  const cairo_rectangle_int_t *rectangle);
 
 cairo_public cairo_status_t
 cairo_region_intersect (cairo_region_t *dst, const cairo_region_t *other);
 
 cairo_public cairo_status_t
 cairo_region_intersect_rectangle (cairo_region_t *dst,
                   const cairo_rectangle_int_t *rectangle);
 
 cairo_public cairo_status_t
 cairo_region_union (cairo_region_t *dst, const cairo_region_t *other);
 
 cairo_public cairo_status_t
 cairo_region_union_rectangle (cairo_region_t *dst,
                   const cairo_rectangle_int_t *rectangle);
 
 cairo_public cairo_status_t
 cairo_region_xor (cairo_region_t *dst, const cairo_region_t *other);
 
 cairo_public cairo_status_t
 cairo_region_xor_rectangle (cairo_region_t *dst,
                 const cairo_rectangle_int_t *rectangle);
 
 /* Functions to be used while debugging (not intended for use in production code) */
 cairo_public void
 cairo_debug_reset_static_data (void);
 
 
 CAIRO_END_DECLS
 
 #endif /* CAIRO_H */