hb-shape-plan

hb-shape-plan — Object representing a shaping plan

Functions

Types and Values

typedef hb_shape_plan_t

Includes

#include <hb.h>

Description

Shape plans are an internal mechanism. Each plan contains state describing how HarfBuzz will shape a particular text segment, based on the combination of segment properties and the capabilities in the font face in use.

Shape plans are not used for shaping directly, but can be queried to access certain information about how shaping will perform, given a set of specific input parameters (script, language, direction, features, etc.).

Most client programs will not need to deal with shape plans directly.

Functions

hb_shape_plan_create ()

hb_shape_plan_t *
hb_shape_plan_create (hb_face_t *face,
                      const hb_segment_properties_t *props,
                      const hb_feature_t *user_features,
                      unsigned int num_user_features,
                      const char * const *shaper_list);

Constructs a shaping plan for a combination of face , user_features , props , and shaper_list .

[Xconstructor]

Parameters

face

hb_face_t to use

 

props

The hb_segment_properties_t of the segment

 

user_features

The list of user-selected features.

[array length=num_user_features]

num_user_features

The number of user-selected features

 

shaper_list

List of shapers to try.

[array zero-terminated=1]

Returns

The shaping plan.

[transfer full]

Since: 0.9.7


hb_shape_plan_create_cached ()

hb_shape_plan_t *
hb_shape_plan_create_cached (hb_face_t *face,
                             const hb_segment_properties_t *props,
                             const hb_feature_t *user_features,
                             unsigned int num_user_features,
                             const char * const *shaper_list);

Creates a cached shaping plan suitable for reuse, for a combination of face , user_features , props , and shaper_list .

Parameters

face

hb_face_t to use

 

props

The hb_segment_properties_t of the segment

 

user_features

The list of user-selected features.

[array length=num_user_features]

num_user_features

The number of user-selected features

 

shaper_list

List of shapers to try.

[array zero-terminated=1]

Returns

The shaping plan.

[transfer full]

Since: 0.9.7


hb_shape_plan_create2 ()

hb_shape_plan_t *
hb_shape_plan_create2 (hb_face_t *face,
                       const hb_segment_properties_t *props,
                       const hb_feature_t *user_features,
                       unsigned int num_user_features,
                       const int *coords,
                       unsigned int num_coords,
                       const char * const *shaper_list);

The variable-font version of hb_shape_plan_create. Constructs a shaping plan for a combination of face , user_features , props , and shaper_list , plus the variation-space coordinates coords .

[Xconstructor]

Parameters

face

hb_face_t to use

 

props

The hb_segment_properties_t of the segment

 

user_features

The list of user-selected features.

[array length=num_user_features]

num_user_features

The number of user-selected features

 

coords

The list of variation-space coordinates.

[array length=num_coords]

num_coords

The number of variation-space coordinates

 

shaper_list

List of shapers to try.

[array zero-terminated=1]

Returns

The shaping plan.

[transfer full]

Since: 1.4.0


hb_shape_plan_create_cached2 ()

hb_shape_plan_t *
hb_shape_plan_create_cached2 (hb_face_t *face,
                              const hb_segment_properties_t *props,
                              const hb_feature_t *user_features,
                              unsigned int num_user_features,
                              const int *coords,
                              unsigned int num_coords,
                              const char * const *shaper_list);

The variable-font version of hb_shape_plan_create_cached. Creates a cached shaping plan suitable for reuse, for a combination of face , user_features , props , and shaper_list , plus the variation-space coordinates coords .

Parameters

face

hb_face_t to use

 

props

The hb_segment_properties_t of the segment

 

user_features

The list of user-selected features.

[array length=num_user_features]

num_user_features

The number of user-selected features

 

coords

The list of variation-space coordinates.

[array length=num_coords]

num_coords

The number of variation-space coordinates

 

shaper_list

List of shapers to try.

[array zero-terminated=1]

Returns

The shaping plan.

[transfer full]

Since: 1.4.0


hb_shape_plan_destroy ()

void
hb_shape_plan_destroy (hb_shape_plan_t *shape_plan);

Decreases the reference count on the given shaping plan. When the reference count reaches zero, the shaping plan is destroyed, freeing all memory.

[skip]

Parameters

shape_plan

A shaping plan

 

Since: 0.9.7


hb_shape_plan_execute ()

hb_bool_t
hb_shape_plan_execute (hb_shape_plan_t *shape_plan,
                       hb_font_t *font,
                       hb_buffer_t *buffer,
                       const hb_feature_t *features,
                       unsigned int num_features);

Executes the given shaping plan on the specified buffer, using the given font and features .

Parameters

shape_plan

A shaping plan

 

font

The hb_font_t to use

 

buffer

The hb_buffer_t to work upon

 

features

Features to enable.

[array length=num_features]

num_features

The number of features to enable

 

Since: 0.9.7


hb_shape_plan_get_empty ()

hb_shape_plan_t *
hb_shape_plan_get_empty (void);

Fetches the singleton empty shaping plan.

Returns

The empty shaping plan.

[transfer full]

Since: 0.9.7


hb_shape_plan_get_shaper ()

const char *
hb_shape_plan_get_shaper (hb_shape_plan_t *shape_plan);

Fetches the shaper from a given shaping plan.

Parameters

shape_plan

A shaping plan

 

Returns

The shaper.

[transfer none]

Since: 0.9.7


hb_shape_plan_get_user_data ()

void *
hb_shape_plan_get_user_data (hb_shape_plan_t *shape_plan,
                             hb_user_data_key_t *key);

Fetches the user data associated with the specified key, attached to the specified shaping plan.

[skip]

Parameters

shape_plan

A shaping plan

 

key

The user-data key to query

 

Returns

A pointer to the user data.

[transfer none]

Since: 0.9.7


hb_shape_plan_reference ()

hb_shape_plan_t *
hb_shape_plan_reference (hb_shape_plan_t *shape_plan);

Increases the reference count on the given shaping plan.

[skip]

Parameters

shape_plan

A shaping plan

 

Returns

shape_plan .

[transfer full]

Since: 0.9.7


hb_shape_plan_set_user_data ()

hb_bool_t
hb_shape_plan_set_user_data (hb_shape_plan_t *shape_plan,
                             hb_user_data_key_t *key,
                             void *data,
                             hb_destroy_func_t destroy,
                             hb_bool_t replace);

Attaches a user-data key/data pair to the given shaping plan.

[skip]

Parameters

shape_plan

A shaping plan

 

key

The user-data key to set

 

data

A pointer to the user data

 

destroy

A callback to call when data is not needed anymore

 

replace

Whether to replace an existing data with the same key

 

Since: 0.9.7

Types and Values

hb_shape_plan_t

typedef struct hb_shape_plan_t hb_shape_plan_t;

Data type for holding a shaping plan.

Shape plans contain information about how HarfBuzz will shape a particular text segment, based on the segment's properties and the capabilities in the font face in use.

Shape plans can be queried about how shaping will perform, given a set of specific input parameters (script, language, direction, features, etc.).