PDF Surfaces

3 CAIRO Library

PDF Surfaces

Rendering PDF documents

## Functions

cairo_surface_t * | cairo_pdf_surface_create ()
cairo_surface_t * | cairo_pdf_surface_create_for_stream ()
void | cairo_pdf_surface_restrict_to_version ()
void | cairo_pdf_get_versions ()
const char * | cairo_pdf_version_to_string ()
void | cairo_pdf_surface_set_size ()

## Types and Values

#define | CAIRO_HAS_PDF_SURFACE
enum | cairo_pdf_version_t

## Object Hierarchy

## Description

The PDF surface is used to render cairo graphics to Adobe PDF files and is a multi-page vector surface backend.

The following mime types are supported: `CAIRO_MIME_TYPE_JPEG`, `CAIRO_MIME_TYPE_JP2`, `CAIRO_MIME_TYPE_UNIQUE_ID`, `CAIRO_MIME_TYPE_JBIG2`, `CAIRO_MIME_TYPE_JBIG2_GLOBAL`, `CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID`.

JBIG2 data in PDF must be in the embedded format as descibed in ISO/IEC 11544. Image specific JBIG2 data must be in `CAIRO_MIME_TYPE_JBIG2`. Any global segments in the JBIG2 data (segments with page association field set to 0) must be in `CAIRO_MIME_TYPE_JBIG2_GLOBAL`. The global data may be shared by multiple images. All images sharing the same global data must set `CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID` to a unique identifer. At least one of the images must provide the global data using `CAIRO_MIME_TYPE_JBIG2_GLOBAL`. The global data will only be embedded once but shared by all JBIG2 images with the same `CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID`.

## Functions

### cairo_pdf_surface_create ()

    cairo_surface_t *
    cairo_pdf_surface_create (const char *filename,
                              double width_in_points,
                              double height_in_points);

Creates a PDF surface of the specified size in points to be written to `filename` .

#### Parameters

filename | a filename for the PDF output (must be writable), `NULL` may be used to specify no output. This will generate a PDF surface that may be queried and used as a source, without generating a temporary file. |
width_in_points | width of the surface, in points (1 point == 1/72.0 inch) |
height_in_points | height of the surface, in points (1 point == 1/72.0 inch) |

#### Returns

a pointer to the newly created surface. The caller owns the surface and should call `cairo_surface_destroy()` when done with it.

This function always returns a valid pointer, but it will return a pointer to a "nil" surface if an error such as out of memory occurs. You can use `cairo_surface_status()` to check for this.

Since 1.2

### cairo_pdf_surface_create_for_stream ()

    cairo_surface_t *
    cairo_pdf_surface_create_for_stream (cairo_write_func_t write_func,
                                         void *closure,
                                         double width_in_points,
                                         double height_in_points);

Creates a PDF surface of the specified size in points to be written incrementally to the stream represented by `write_func` and `closure` .

#### Parameters

write_func | a `cairo_write_func_t` to accept the output data, may be `NULL` to indicate a no-op `write_func` . With a no-op `write_func` , the surface may be queried or used as a source without generating any temporary files. |
closure | the closure argument for `write_func` |
width_in_points | width of the surface, in points (1 point == 1/72.0 inch) |
height_in_points | height of the surface, in points (1 point == 1/72.0 inch) |

#### Returns

a pointer to the newly created surface. The caller owns the surface and should call `cairo_surface_destroy()` when done with it.

This function always returns a valid pointer, but it will return a pointer to a "nil" surface if an error such as out of memory occurs. You can use `cairo_surface_status()` to check for this.

Since 1.2

### cairo_pdf_surface_restrict_to_version ()

    void
    cairo_pdf_surface_restrict_to_version (cairo_surface_t *surface,
                                           cairo_pdf_version_t version);

Restricts the generated PDF file to `version` . See `cairo_pdf_get_versions()` for a list of available version values that can be used here.

This function should only be called before any drawing operations have been performed on the given surface. The simplest way to do this is to call this function immediately after creating the surface.

#### Parameters

surface | a PDF `cairo_surface_t` |
version | PDF version |

Since 1.10

### cairo_pdf_get_versions ()

    void
    cairo_pdf_get_versions (cairo_pdf_version_t const **versions,
                            int *num_versions);

Used to retrieve the list of supported versions. See `cairo_pdf_surface_restrict_to_version()`.

#### Parameters

versions | supported version list |
num_versions | list length |

Since 1.10

### cairo_pdf_version_to_string ()

    const char *
    cairo_pdf_version_to_string (cairo_pdf_version_t version);

Get the string representation of the given `version` id. This function will return `NULL` if `version` isn't valid. See `cairo_pdf_get_versions()` for a way to get the list of valid version ids.

#### Parameters

version | a version id |

#### Returns

the string associated to given version.

Since 1.10

### cairo_pdf_surface_set_size ()

    void
    cairo_pdf_surface_set_size (cairo_surface_t *surface,
                                double width_in_points,
                                double height_in_points);

Changes the size of a PDF surface for the current (and subsequent) pages.

This function should only be called before any drawing operations have been performed on the current page. The simplest way to do this is to call this function immediately after creating the surface or immediately after completing a page with either `cairo_show_page()` or `cairo_copy_page()`.

#### Parameters

surface | a PDF `cairo_surface_t` |
width_in_points | new surface width, in points (1 point == 1/72.0 inch) |
height_in_points | new surface height, in points (1 point == 1/72.0 inch) |

Since 1.2

## Types and Values

### CAIRO_HAS_PDF_SURFACE

    #define CAIRO_HAS_PDF_SURFACE 1

Defined if the PDF surface backend is available. This macro can be used to conditionally compile backend-specific code.

Since 1.2

### enum cairo_pdf_version_t

`cairo_pdf_version_t` is used to describe the version number of the PDF specification that a generated PDF file will conform to.

#### Members

CAIRO_PDF_VERSION_1_4 | The version 1.4 of the PDF specification. (Since 1.10) |
CAIRO_PDF_VERSION_1_5 | The version 1.5 of the PDF specification. (Since 1.10) |

Since 1.10

## See Also

`cairo_surface_t`