]> cairo_font_options_t 3 CAIRO Library cairo_font_options_t How a font should be rendered cairo_font_options_t * cairo_font_options_create () cairo_font_options_t * cairo_font_options_copy () void cairo_font_options_destroy () cairo_status_t cairo_font_options_status () void cairo_font_options_merge () unsigned long cairo_font_options_hash () cairo_bool_t cairo_font_options_equal () void cairo_font_options_set_antialias () cairo_antialias_t cairo_font_options_get_antialias () void cairo_font_options_set_subpixel_order () cairo_subpixel_order_t cairo_font_options_get_subpixel_order () void cairo_font_options_set_hint_style () cairo_hint_style_t cairo_font_options_get_hint_style () void cairo_font_options_set_hint_metrics () cairo_hint_metrics_t cairo_font_options_get_hint_metrics () const char * cairo_font_options_get_variations () void cairo_font_options_set_variations () typedefcairo_font_options_t enumcairo_subpixel_order_t enumcairo_hint_style_t enumcairo_hint_metrics_t The font options specify how fonts should be rendered. Most of the time the font options implied by a surface are just right and do not need any changes, but for pixel-based targets tweaking font options may result in superior output on a particular display. cairo_font_options_create cairo_font_options_t * cairo_font_options_create (void); Allocates a new font options object with all options initialized to default values. a newly allocated cairo_font_options_t. Free with cairo_font_options_destroy(). This function always returns a valid pointer; if memory cannot be allocated, then a special error object is returned where all operations on the object do nothing. You can check for this with cairo_font_options_status(). Since: 1.0 cairo_font_options_copy cairo_font_options_t * cairo_font_options_copy (const cairo_font_options_t *original); Allocates a new font options object copying the option values from original . original a cairo_font_options_t a newly allocated cairo_font_options_t. Free with cairo_font_options_destroy(). This function always returns a valid pointer; if memory cannot be allocated, then a special error object is returned where all operations on the object do nothing. You can check for this with cairo_font_options_status(). Since: 1.0 cairo_font_options_destroy void cairo_font_options_destroy (cairo_font_options_t *options); Destroys a cairo_font_options_t object created with cairo_font_options_create() or cairo_font_options_copy(). options a cairo_font_options_t Since: 1.0 cairo_font_options_status cairo_status_t cairo_font_options_status (cairo_font_options_t *options); Checks whether an error has previously occurred for this font options object options a cairo_font_options_t CAIRO_STATUS_SUCCESS or CAIRO_STATUS_NO_MEMORY Since: 1.0 cairo_font_options_merge void cairo_font_options_merge (cairo_font_options_t *options, const cairo_font_options_t *other); Merges non-default options from other into options , replacing existing values. This operation can be thought of as somewhat similar to compositing other onto options with the operation of CAIRO_OPERATOR_OVER. options a cairo_font_options_t other another cairo_font_options_t Since: 1.0 cairo_font_options_hash unsigned long cairo_font_options_hash (const cairo_font_options_t *options); Compute a hash for the font options object; this value will be useful when storing an object containing a cairo_font_options_t in a hash table. options a cairo_font_options_t the hash value for the font options object. The return value can be cast to a 32-bit type if a 32-bit hash value is needed. Since: 1.0 cairo_font_options_equal cairo_bool_t cairo_font_options_equal (const cairo_font_options_t *options, const cairo_font_options_t *other); Compares two font options objects for equality. options a cairo_font_options_t other another cairo_font_options_t TRUE if all fields of the two font options objects match. Note that this function will return FALSE if either object is in error. Since: 1.0 cairo_font_options_set_antialias void cairo_font_options_set_antialias (cairo_font_options_t *options, cairo_antialias_t antialias); Sets the antialiasing mode for the font options object. This specifies the type of antialiasing to do when rendering text. options a cairo_font_options_t antialias the new antialiasing mode Since: 1.0 cairo_font_options_get_antialias cairo_antialias_t cairo_font_options_get_antialias (const cairo_font_options_t *options); Gets the antialiasing mode for the font options object. options a cairo_font_options_t the antialiasing mode Since: 1.0 cairo_font_options_set_subpixel_order void cairo_font_options_set_subpixel_order (cairo_font_options_t *options, cairo_subpixel_order_t subpixel_order); Sets the subpixel order for the font options object. 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. See the documentation for cairo_subpixel_order_t for full details. options a cairo_font_options_t subpixel_order the new subpixel order Since: 1.0 cairo_font_options_get_subpixel_order cairo_subpixel_order_t cairo_font_options_get_subpixel_order (const cairo_font_options_t *options); Gets the subpixel order for the font options object. See the documentation for cairo_subpixel_order_t for full details. options a cairo_font_options_t the subpixel order for the font options object Since: 1.0 cairo_font_options_set_hint_style void cairo_font_options_set_hint_style (cairo_font_options_t *options, cairo_hint_style_t hint_style); Sets the hint style for font outlines for the font options object. This controls whether to fit font outlines to the pixel grid, and if so, whether to optimize for fidelity or contrast. See the documentation for cairo_hint_style_t for full details. options a cairo_font_options_t hint_style the new hint style Since: 1.0 cairo_font_options_get_hint_style cairo_hint_style_t cairo_font_options_get_hint_style (const cairo_font_options_t *options); Gets the hint style for font outlines for the font options object. See the documentation for cairo_hint_style_t for full details. options a cairo_font_options_t the hint style for the font options object Since: 1.0 cairo_font_options_set_hint_metrics void cairo_font_options_set_hint_metrics (cairo_font_options_t *options, cairo_hint_metrics_t hint_metrics); Sets the metrics hinting mode for the font options object. This controls whether metrics are quantized to integer values in device units. See the documentation for cairo_hint_metrics_t for full details. options a cairo_font_options_t hint_metrics the new metrics hinting mode Since: 1.0 cairo_font_options_get_hint_metrics cairo_hint_metrics_t cairo_font_options_get_hint_metrics (const cairo_font_options_t *options); Gets the metrics hinting mode for the font options object. See the documentation for cairo_hint_metrics_t for full details. options a cairo_font_options_t the metrics hinting mode for the font options object Since: 1.0 cairo_font_options_get_variations const char * cairo_font_options_get_variations (cairo_font_options_t *options); Gets the OpenType font variations for the font options object. See cairo_font_options_set_variations() for details about the string format. options a cairo_font_options_t the font variations for the font options object. The returned string belongs to the options and must not be modified. It is valid until either the font options object is destroyed or the font variations in this object is modified with cairo_font_options_set_variations(). Since: 1.16 cairo_font_options_set_variations void cairo_font_options_set_variations (cairo_font_options_t *options, const char *variations); Sets the OpenType font variations for the font options object. Font variations are specified as a string with a format that is similar to the CSS font-variation-settings. The string contains a comma-separated list of axis assignments, which each assignment consists of a 4-character axis name and a value, separated by whitespace and optional equals sign. Examples: wght=200,wdth=140.5 wght 200 , wdth 140.5 options a cairo_font_options_t variations the new font variations, or NULL Since: 1.16 cairo_font_options_t typedef struct _cairo_font_options 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 cairo_font_options_set_feature_name() and cairo_font_options_get_feature_name(), 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 cairo_subpixel_order_t 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. 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 Since: 1.0 cairo_hint_style_t 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. 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 Since: 1.0 cairo_hint_metrics_t 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. 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 Since: 1.0 cairo_scaled_font_t