jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: PostScript Surfaces: Cairo: A Vector Graphics Library jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:
jpayne@68:
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jpayne@68:

PostScript Surfaces

jpayne@68:

PostScript Surfaces — Rendering PostScript documents

jpayne@68:
jpayne@68:
jpayne@68:

Functions

jpayne@68:
jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:
jpayne@68: cairo_surface_t * jpayne@68: jpayne@68: cairo_ps_surface_create () jpayne@68:
jpayne@68: cairo_surface_t * jpayne@68: jpayne@68: cairo_ps_surface_create_for_stream () jpayne@68:
jpayne@68: void jpayne@68: jpayne@68: cairo_ps_surface_restrict_to_level () jpayne@68:
jpayne@68: void jpayne@68: jpayne@68: cairo_ps_get_levels () jpayne@68:
const char * jpayne@68: jpayne@68: cairo_ps_level_to_string () jpayne@68:
jpayne@68: void jpayne@68: jpayne@68: cairo_ps_surface_set_eps () jpayne@68:
jpayne@68: cairo_bool_t jpayne@68: jpayne@68: cairo_ps_surface_get_eps () jpayne@68:
jpayne@68: void jpayne@68: jpayne@68: cairo_ps_surface_set_size () jpayne@68:
jpayne@68: void jpayne@68: jpayne@68: cairo_ps_surface_dsc_begin_setup () jpayne@68:
jpayne@68: void jpayne@68: jpayne@68: cairo_ps_surface_dsc_begin_page_setup () jpayne@68:
jpayne@68: void jpayne@68: jpayne@68: cairo_ps_surface_dsc_comment () jpayne@68:
jpayne@68:
jpayne@68:
jpayne@68:

Types and Values

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jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:
#defineCAIRO_HAS_PS_SURFACE
enumcairo_ps_level_t
jpayne@68:
jpayne@68:
jpayne@68:

Description

jpayne@68:

The PostScript surface is used to render cairo graphics to Adobe jpayne@68: PostScript files and is a multi-page vector surface backend.

jpayne@68:

The following mime types are supported: CAIRO_MIME_TYPE_JPEG, jpayne@68: CAIRO_MIME_TYPE_UNIQUE_ID, jpayne@68: CAIRO_MIME_TYPE_CCITT_FAX, CAIRO_MIME_TYPE_CCITT_FAX_PARAMS, jpayne@68: CAIRO_MIME_TYPE_CCITT_FAX, CAIRO_MIME_TYPE_CCITT_FAX_PARAMS, jpayne@68: CAIRO_MIME_TYPE_EPS, CAIRO_MIME_TYPE_EPS_PARAMS.

jpayne@68:

Source surfaces used by the PostScript surface that have a jpayne@68: CAIRO_MIME_TYPE_UNIQUE_ID mime type will be stored in PostScript jpayne@68: printer memory for the duration of the print jpayne@68: job. CAIRO_MIME_TYPE_UNIQUE_ID should only be used for small jpayne@68: frequently used sources.

jpayne@68:

The CAIRO_MIME_TYPE_CCITT_FAX and CAIRO_MIME_TYPE_CCITT_FAX_PARAMS mime types jpayne@68: are documented in CCITT Fax Images.

jpayne@68:
jpayne@68:

Embedding EPS files

jpayne@68:

Encapsulated PostScript files can be embedded in the PS output by jpayne@68: setting the CAIRO_MIME_TYPE_EPS mime data on a surface to the EPS jpayne@68: data and painting the surface. The EPS will be scaled and jpayne@68: translated to the extents of the surface the EPS data is attached jpayne@68: to.

jpayne@68:

The CAIRO_MIME_TYPE_EPS mime type requires the jpayne@68: CAIRO_MIME_TYPE_EPS_PARAMS mime data to also be provided in order jpayne@68: to specify the embeddding parameters. CAIRO_MIME_TYPE_EPS_PARAMS jpayne@68: mime data must contain a string of the form "bbox=[llx lly urx jpayne@68: ury]" that specifies the bounding box (in PS coordinates) of the jpayne@68: EPS graphics. The parameters are: lower left x, lower left y, upper jpayne@68: right x, upper right y. Normally the bbox data is identical to the jpayne@68: %%BoundingBox data in the EPS file.

jpayne@68:
jpayne@68:
jpayne@68:
jpayne@68:

Functions

jpayne@68:
jpayne@68:

cairo_ps_surface_create ()

jpayne@68: 
cairo_surface_t *
jpayne@68: cairo_ps_surface_create (const char *filename,
jpayne@68:                          double width_in_points,
jpayne@68:                          double height_in_points);
jpayne@68:

Creates a PostScript surface of the specified size in points to be jpayne@68: written to filename jpayne@68: . See cairo_ps_surface_create_for_stream() for jpayne@68: a more flexible mechanism for handling the PostScript output than jpayne@68: simply writing it to a named file.

jpayne@68:

Note that the size of individual pages of the PostScript output can jpayne@68: vary. See cairo_ps_surface_set_size().

jpayne@68:
jpayne@68:

Parameters

jpayne@68:
jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:

filename

a filename for the PS output (must be writable), NULL may be jpayne@68: used to specify no output. This will generate a PS surface that jpayne@68: may be queried and used as a source, without generating a jpayne@68: 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)

 
jpayne@68:
jpayne@68:
jpayne@68:

Returns

jpayne@68:

a pointer to the newly created surface. The caller jpayne@68: owns the surface and should call cairo_surface_destroy() when done jpayne@68: with it.

jpayne@68:

This function always returns a valid pointer, but it will return a jpayne@68: pointer to a "nil" surface if an error such as out of memory jpayne@68: occurs. You can use cairo_surface_status() to check for this.

jpayne@68:
jpayne@68:

Since: 1.2

jpayne@68:
jpayne@68:
jpayne@68:
jpayne@68:

cairo_ps_surface_create_for_stream ()

jpayne@68: 
cairo_surface_t *
jpayne@68: cairo_ps_surface_create_for_stream (cairo_write_func_t write_func,
jpayne@68:                                     void *closure,
jpayne@68:                                     double width_in_points,
jpayne@68:                                     double height_in_points);
jpayne@68:

Creates a PostScript surface of the specified size in points to be jpayne@68: written incrementally to the stream represented by write_func jpayne@68: and jpayne@68: closure jpayne@68: . See cairo_ps_surface_create() for a more convenient way jpayne@68: to simply direct the PostScript output to a named file.

jpayne@68:

Note that the size of individual pages of the PostScript jpayne@68: output can vary. See cairo_ps_surface_set_size().

jpayne@68:
jpayne@68:

Parameters

jpayne@68:
jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:

write_func

a cairo_write_func_t to accept the output data, may be NULL jpayne@68: to indicate a no-op write_func jpayne@68: . With a no-op write_func jpayne@68: , jpayne@68: the surface may be queried or used as a source without jpayne@68: generating any temporary files.

 

closure

the closure argument for write_func jpayne@68:

 

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)

 
jpayne@68:
jpayne@68:
jpayne@68:

Returns

jpayne@68:

a pointer to the newly created surface. The caller jpayne@68: owns the surface and should call cairo_surface_destroy() when done jpayne@68: with it.

jpayne@68:

This function always returns a valid pointer, but it will return a jpayne@68: pointer to a "nil" surface if an error such as out of memory jpayne@68: occurs. You can use cairo_surface_status() to check for this.

jpayne@68:
jpayne@68:

Since: 1.2

jpayne@68:
jpayne@68:
jpayne@68:
jpayne@68:

cairo_ps_surface_restrict_to_level ()

jpayne@68: 
void
jpayne@68: cairo_ps_surface_restrict_to_level (cairo_surface_t *surface,
jpayne@68:                                     cairo_ps_level_t level);
jpayne@68:

Restricts the generated PostSript file to level jpayne@68: . See jpayne@68: cairo_ps_get_levels() for a list of available level values that jpayne@68: can be used here.

jpayne@68:

This function should only be called before any drawing operations jpayne@68: have been performed on the given surface. The simplest way to do jpayne@68: this is to call this function immediately after creating the jpayne@68: surface.

jpayne@68:
jpayne@68:

Parameters

jpayne@68:
jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:

surface

a PostScript cairo_surface_t

 

level

PostScript level

 
jpayne@68:
jpayne@68:

Since: 1.6

jpayne@68:
jpayne@68:
jpayne@68:
jpayne@68:

cairo_ps_get_levels ()

jpayne@68: 
void
jpayne@68: cairo_ps_get_levels (cairo_ps_level_t const **levels,
jpayne@68:                      int *num_levels);
jpayne@68:

Used to retrieve the list of supported levels. See jpayne@68: cairo_ps_surface_restrict_to_level().

jpayne@68:
jpayne@68:

Parameters

jpayne@68:
jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:

levels

supported level list

 

num_levels

list length

 
jpayne@68:
jpayne@68:

Since: 1.6

jpayne@68:
jpayne@68:
jpayne@68:
jpayne@68:

cairo_ps_level_to_string ()

jpayne@68: 
const char *
jpayne@68: cairo_ps_level_to_string (cairo_ps_level_t level);
jpayne@68:

Get the string representation of the given level jpayne@68: id. This function jpayne@68: will return NULL if level jpayne@68: id isn't valid. See cairo_ps_get_levels() jpayne@68: for a way to get the list of valid level ids.

jpayne@68:
jpayne@68:

Parameters

jpayne@68:
jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:

level

a level id

 
jpayne@68:
jpayne@68:
jpayne@68:

Returns

jpayne@68:

the string associated to given level.

jpayne@68:
jpayne@68:

Since: 1.6

jpayne@68:
jpayne@68:
jpayne@68:
jpayne@68:

cairo_ps_surface_set_eps ()

jpayne@68: 
void
jpayne@68: cairo_ps_surface_set_eps (cairo_surface_t *surface,
jpayne@68:                           cairo_bool_t eps);
jpayne@68:

If eps jpayne@68: is TRUE, the PostScript surface will output Encapsulated jpayne@68: PostScript.

jpayne@68:

This function should only be called before any drawing operations jpayne@68: have been performed on the current page. The simplest way to do jpayne@68: this is to call this function immediately after creating the jpayne@68: surface. An Encapsulated PostScript file should never contain more jpayne@68: than one page.

jpayne@68:
jpayne@68:

Parameters

jpayne@68:
jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:

surface

a PostScript cairo_surface_t

 

eps

TRUE to output EPS format PostScript

 
jpayne@68:
jpayne@68:

Since: 1.6

jpayne@68:
jpayne@68:
jpayne@68:
jpayne@68:

cairo_ps_surface_get_eps ()

jpayne@68: 
cairo_bool_t
jpayne@68: cairo_ps_surface_get_eps (cairo_surface_t *surface);
jpayne@68:

Check whether the PostScript surface will output Encapsulated PostScript.

jpayne@68:
jpayne@68:

Parameters

jpayne@68:
jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:

surface

a PostScript cairo_surface_t

 
jpayne@68:
jpayne@68:
jpayne@68:

Returns

jpayne@68:

TRUE if the surface will output Encapsulated PostScript.

jpayne@68:
jpayne@68:

Since: 1.6

jpayne@68:
jpayne@68:
jpayne@68:
jpayne@68:

cairo_ps_surface_set_size ()

jpayne@68: 
void
jpayne@68: cairo_ps_surface_set_size (cairo_surface_t *surface,
jpayne@68:                            double width_in_points,
jpayne@68:                            double height_in_points);
jpayne@68:

Changes the size of a PostScript surface for the current (and jpayne@68: subsequent) pages.

jpayne@68:

This function should only be called before any drawing operations jpayne@68: have been performed on the current page. The simplest way to do jpayne@68: this is to call this function immediately after creating the jpayne@68: surface or immediately after completing a page with either jpayne@68: cairo_show_page() or cairo_copy_page().

jpayne@68:
jpayne@68:

Parameters

jpayne@68:
jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:

surface

a PostScript 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)

 
jpayne@68:
jpayne@68:

Since: 1.2

jpayne@68:
jpayne@68:
jpayne@68:
jpayne@68:

cairo_ps_surface_dsc_begin_setup ()

jpayne@68: 
void
jpayne@68: cairo_ps_surface_dsc_begin_setup (cairo_surface_t *surface);
jpayne@68:

This function indicates that subsequent calls to jpayne@68: cairo_ps_surface_dsc_comment() should direct comments to the Setup jpayne@68: section of the PostScript output.

jpayne@68:

This function should be called at most once per surface, and must jpayne@68: be called before any call to cairo_ps_surface_dsc_begin_page_setup() jpayne@68: and before any drawing is performed to the surface.

jpayne@68:

See cairo_ps_surface_dsc_comment() for more details.

jpayne@68:
jpayne@68:

Parameters

jpayne@68:
jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:

surface

a PostScript cairo_surface_t

 
jpayne@68:
jpayne@68:

Since: 1.2

jpayne@68:
jpayne@68:
jpayne@68:
jpayne@68:

cairo_ps_surface_dsc_begin_page_setup ()

jpayne@68: 
void
jpayne@68: cairo_ps_surface_dsc_begin_page_setup (cairo_surface_t *surface);
jpayne@68:

This function indicates that subsequent calls to jpayne@68: cairo_ps_surface_dsc_comment() should direct comments to the jpayne@68: PageSetup section of the PostScript output.

jpayne@68:

This function call is only needed for the first page of a jpayne@68: surface. It should be called after any call to jpayne@68: cairo_ps_surface_dsc_begin_setup() and before any drawing is jpayne@68: performed to the surface.

jpayne@68:

See cairo_ps_surface_dsc_comment() for more details.

jpayne@68:
jpayne@68:

Parameters

jpayne@68:
jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68:

surface

a PostScript cairo_surface_t

 
jpayne@68:
jpayne@68:

Since: 1.2

jpayne@68:
jpayne@68:
jpayne@68:
jpayne@68:

cairo_ps_surface_dsc_comment ()

jpayne@68: 
void
jpayne@68: cairo_ps_surface_dsc_comment (cairo_surface_t *surface,
jpayne@68:                               const char *comment);
jpayne@68:

Emit a comment into the PostScript output for the given surface.

jpayne@68:

The comment is expected to conform to the PostScript Language jpayne@68: Document Structuring Conventions (DSC). Please see that manual for jpayne@68: details on the available comments and their meanings. In jpayne@68: particular, the %%IncludeFeature comment allows a jpayne@68: device-independent means of controlling printer device features. So jpayne@68: the PostScript Printer Description Files Specification will also be jpayne@68: a useful reference.

jpayne@68:

The comment string must begin with a percent character (%) and the jpayne@68: total length of the string (including any initial percent jpayne@68: characters) must not exceed 255 characters. Violating either of jpayne@68: these conditions will place surface jpayne@68: into an error state. But jpayne@68: beyond these two conditions, this function will not enforce jpayne@68: conformance of the comment with any particular specification.

jpayne@68:

The comment string should not have a trailing newline.

jpayne@68:

The DSC specifies different sections in which particular comments jpayne@68: can appear. This function provides for comments to be emitted jpayne@68: within three sections: the header, the Setup section, and the jpayne@68: PageSetup section. Comments appearing in the first two sections jpayne@68: apply to the entire document while comments in the BeginPageSetup jpayne@68: section apply only to a single page.

jpayne@68:

For comments to appear in the header section, this function should jpayne@68: be called after the surface is created, but before a call to jpayne@68: cairo_ps_surface_dsc_begin_setup().

jpayne@68:

For comments to appear in the Setup section, this function should jpayne@68: be called after a call to cairo_ps_surface_dsc_begin_setup() but jpayne@68: before a call to cairo_ps_surface_dsc_begin_page_setup().

jpayne@68:

For comments to appear in the PageSetup section, this function jpayne@68: should be called after a call to jpayne@68: cairo_ps_surface_dsc_begin_page_setup().

jpayne@68:

Note that it is only necessary to call jpayne@68: cairo_ps_surface_dsc_begin_page_setup() for the first page of any jpayne@68: surface. After a call to cairo_show_page() or cairo_copy_page() jpayne@68: comments are unambiguously directed to the PageSetup section of the jpayne@68: current page. But it doesn't hurt to call this function at the jpayne@68: beginning of every page as that consistency may make the calling jpayne@68: code simpler.

jpayne@68:

As a final note, cairo automatically generates several comments on jpayne@68: its own. As such, applications must not manually generate any of jpayne@68: the following comments:

jpayne@68:

Header section: %!PS-Adobe-3.0, %%Creator, %%CreationDate, %%Pages, jpayne@68: %%BoundingBox, %%DocumentData, %%LanguageLevel, %%EndComments.

jpayne@68:

Setup section: %%BeginSetup, %%EndSetup

jpayne@68:

PageSetup section: %%BeginPageSetup, %%PageBoundingBox, %%EndPageSetup.

jpayne@68:

Other sections: %%BeginProlog, %%EndProlog, %%Page, %%Trailer, %%EOF

jpayne@68:

Here is an example sequence showing how this function might be used:

jpayne@68:
jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: jpayne@68: 
1
jpayne@68: 2
jpayne@68: 3
jpayne@68: 4
jpayne@68: 5
jpayne@68: 6
jpayne@68: 7
jpayne@68: 8
jpayne@68: 9
jpayne@68: 10
jpayne@68: 11
jpayne@68: 12
jpayne@68: 13
jpayne@68: 14
jpayne@68: 15
jpayne@68: 16
jpayne@68: 17
jpayne@68: 18
cairo_surface_t *surface = cairo_ps_surface_create (filename, width, height);
jpayne@68: ...
jpayne@68: cairo_ps_surface_dsc_comment (surface, "%%Title: My excellent document");
jpayne@68: cairo_ps_surface_dsc_comment (surface, "%%Copyright: Copyright (C) 2006 Cairo Lover")
jpayne@68: ...
jpayne@68: cairo_ps_surface_dsc_begin_setup (surface);
jpayne@68: cairo_ps_surface_dsc_comment (surface, "%%IncludeFeature: *MediaColor White");
jpayne@68: ...
jpayne@68: cairo_ps_surface_dsc_begin_page_setup (surface);
jpayne@68: cairo_ps_surface_dsc_comment (surface, "%%IncludeFeature: *PageSize A3");
jpayne@68: cairo_ps_surface_dsc_comment (surface, "%%IncludeFeature: *InputSlot LargeCapacity");
jpayne@68: cairo_ps_surface_dsc_comment (surface, "%%IncludeFeature: *MediaType Glossy");
jpayne@68: cairo_ps_surface_dsc_comment (surface, "%%IncludeFeature: *MediaColor Blue");
jpayne@68: ... draw to first page here ..
jpayne@68: cairo_show_page (cr);
jpayne@68: ...
jpayne@68: cairo_ps_surface_dsc_comment (surface, "%%IncludeFeature: *PageSize A5");
jpayne@68: ...
jpayne@68:
jpayne@68: jpayne@68:
jpayne@68:

Parameters

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surface

a PostScript cairo_surface_t

 

comment

a comment string to be emitted into the PostScript output

 
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Since: 1.2

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Types and Values

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CAIRO_HAS_PS_SURFACE

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#define CAIRO_HAS_PS_SURFACE 1
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Defined if the PostScript surface backend is available. jpayne@68: This macro can be used to conditionally compile backend-specific code.

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Since: 1.2

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enum cairo_ps_level_t

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cairo_ps_level_t is used to describe the language level of the jpayne@68: PostScript Language Reference that a generated PostScript file will jpayne@68: conform to.

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Members

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CAIRO_PS_LEVEL_2

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The language level 2 of the PostScript specification. (Since 1.6)

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CAIRO_PS_LEVEL_3

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The language level 3 of the PostScript specification. (Since 1.6)

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Since: 1.6

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See Also

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cairo_surface_t

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