]> SVG Surfaces 3 CAIRO Library SVG Surfaces Rendering SVG documents cairo_surface_t * cairo_svg_surface_create () cairo_surface_t * cairo_svg_surface_create_for_stream () cairo_svg_unit_t cairo_svg_surface_get_document_unit () void cairo_svg_surface_set_document_unit () void cairo_svg_surface_restrict_to_version () void cairo_svg_get_versions () const char * cairo_svg_version_to_string () #defineCAIRO_HAS_SVG_SURFACE enumcairo_svg_version_t enumcairo_svg_unit_t The SVG surface is used to render cairo graphics to SVG files and is a multi-page vector surface backend. cairo_svg_surface_create cairo_surface_t * cairo_svg_surface_create (const char *filename, double width_in_points, double height_in_points); Creates a SVG surface of the specified size in points to be written to filename . The SVG surface backend recognizes the following MIME types for the data attached to a surface (see cairo_surface_set_mime_data()) when it is used as a source pattern for drawing on this surface: CAIRO_MIME_TYPE_JPEG, CAIRO_MIME_TYPE_PNG, CAIRO_MIME_TYPE_URI. If any of them is specified, the SVG backend emits a href with the content of MIME data instead of a surface snapshot (PNG, Base64-encoded) in the corresponding image tag. The unofficial MIME type CAIRO_MIME_TYPE_URI is examined first. If present, the URI is emitted as is: assuring the correctness of URI is left to the client code. If CAIRO_MIME_TYPE_URI is not present, but CAIRO_MIME_TYPE_JPEG or CAIRO_MIME_TYPE_PNG is specified, the corresponding data is Base64-encoded and emitted. If CAIRO_MIME_TYPE_UNIQUE_ID is present, all surfaces with the same unique identifier will only be embedded once. filename a filename for the SVG output (must be writable), NULL may be used to specify no output. This will generate a SVG 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) 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_svg_surface_create_for_stream cairo_surface_t * cairo_svg_surface_create_for_stream (cairo_write_func_t write_func, void *closure, double width_in_points, double height_in_points); Creates a SVG surface of the specified size in points to be written incrementally to the stream represented by write_func and closure . 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) 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_svg_surface_get_document_unit cairo_svg_unit_t cairo_svg_surface_get_document_unit (cairo_surface_t *surface); Get the unit of the SVG surface. If the surface passed as an argument is not a SVG surface, the function sets the error status to CAIRO_STATUS_SURFACE_TYPE_MISMATCH and returns CAIRO_SVG_UNIT_USER. surface a SVG cairo_surface_t the SVG unit of the SVG surface. Since: 1.16 cairo_svg_surface_set_document_unit void cairo_svg_surface_set_document_unit (cairo_surface_t *surface, cairo_svg_unit_t unit); Use the specified unit for the width and height of the generated SVG file. See cairo_svg_unit_t for a list of available unit values that can be used here. This function can be called at any time before generating the SVG file. However to minimize the risk of ambiguities it's recommended to call it before any drawing operations have been performed on the given surface, to make it clearer what the unit used in the drawing operations is. The simplest way to do this is to call this function immediately after creating the SVG surface. Note if this function is never called, the default unit for SVG documents generated by cairo will be "pt". This is for historical reasons. surface a SVG cairo_surface_t unit SVG unit Since: 1.16 cairo_svg_surface_restrict_to_version void cairo_svg_surface_restrict_to_version (cairo_surface_t *surface, cairo_svg_version_t version); Restricts the generated SVG file to version . See cairo_svg_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. surface a SVG cairo_surface_t version SVG version Since: 1.2 cairo_svg_get_versions void cairo_svg_get_versions (cairo_svg_version_t const **versions, int *num_versions); Used to retrieve the list of supported versions. See cairo_svg_surface_restrict_to_version(). versions supported version list num_versions list length Since: 1.2 cairo_svg_version_to_string const char * cairo_svg_version_to_string (cairo_svg_version_t version); Get the string representation of the given version id. This function will return NULL if version isn't valid. See cairo_svg_get_versions() for a way to get the list of valid version ids. version a version id the string associated to given version. Since: 1.2 CAIRO_HAS_SVG_SURFACE #define CAIRO_HAS_SVG_SURFACE 1 Defined if the SVG surface backend is available. This macro can be used to conditionally compile backend-specific code. Since: 1.2 cairo_svg_version_t cairo_svg_version_t is used to describe the version number of the SVG specification that a generated SVG file will conform to. CAIRO_SVG_VERSION_1_1 The version 1.1 of the SVG specification. (Since 1.2) CAIRO_SVG_VERSION_1_2 The version 1.2 of the SVG specification. (Since 1.2) Since: 1.2 cairo_svg_unit_t CAIRO_SVG_UNIT_USER : User unit, a value in the current coordinate system. If used in the root element for the initial coordinate systems it corresponds to pixels. (Since 1.16) CAIRO_SVG_UNIT_EM : The size of the element's font. (Since 1.16) CAIRO_SVG_UNIT_EX : The x-height of the element’s font. (Since 1.16) CAIRO_SVG_UNIT_PX : Pixels (1px = 1/96th of 1in). (Since 1.16) CAIRO_SVG_UNIT_IN : Inches (1in = 2.54cm = 96px). (Since 1.16) CAIRO_SVG_UNIT_CM : Centimeters (1cm = 96px/2.54). (Since 1.16) CAIRO_SVG_UNIT_MM : Millimeters (1mm = 1/10th of 1cm). (Since 1.16) CAIRO_SVG_UNIT_PT : Points (1pt = 1/72th of 1in). (Since 1.16) CAIRO_SVG_UNIT_PC : Picas (1pc = 1/6th of 1in). (Since 1.16) CAIRO_SVG_UNIT_PERCENT : Percent, a value that is some fraction of another reference value. (Since 1.16) cairo_svg_unit_t is used to describe the units valid for coordinates and lengths in the SVG specification. See also: https://www.w3.org/TR/SVG/coords.htmlUnits https://www.w3.org/TR/SVG/types.htmlDataTypeLength https://www.w3.org/TR/css-values-3/lengths CAIRO_SVG_UNIT_USER CAIRO_SVG_UNIT_EM CAIRO_SVG_UNIT_EX CAIRO_SVG_UNIT_PX CAIRO_SVG_UNIT_IN CAIRO_SVG_UNIT_CM CAIRO_SVG_UNIT_MM CAIRO_SVG_UNIT_PT CAIRO_SVG_UNIT_PC CAIRO_SVG_UNIT_PERCENT Since: 1.16 cairo_surface_t