HarfBuzz text shaping engine http://harfbuzz.github.io/
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cdef extern from "stdlib.h":
ctypedef int size_t
void *malloc(size_t size)
void free(void* ptr)
cdef extern from "ft2build.h" :
pass
cdef extern from "freetype/freetype.h" :
ctypedef void *FT_Library
ctypedef void *FT_Face
ctypedef int FT_Error
FT_Error FT_Init_FreeType (FT_Library *alib)
FT_Error FT_Done_FreeType (FT_Library alib)
FT_Error FT_Done_Face (FT_Face alib)
FT_Error FT_New_Face( FT_Library library, char *path, unsigned long index, FT_Face *aface)
FT_Error FT_Set_Char_Size (FT_Face aFace, unsigned int size_x, unsigned int size_y, unsigned int res_x, unsigned int res_y)
cdef extern from "hb-common.h" :
cdef enum hb_direction_t :
HB_DIRECTION_LTR
HB_DIRECTION_RTL
HB_DIRECTION_TTB
HB_DIRECTION_BTT
ctypedef unsigned long hb_codepoint_t
ctypedef long hb_position_t
ctypedef unsigned long hb_mask_t
ctypedef unsigned long hb_tag_t
hb_tag_t hb_tag_from_string (char *s)
ctypedef void (*hb_destroy_func_t) (void *user_data)
ctypedef void *hb_language_t
hb_language_t hb_language_from_string(char *str)
char * hb_language_to_string(hb_language_t language)
cdef extern from "hb-unicode.h" :
# there must be a better way of syncing this list with the true source
ctypedef enum hb_script_t :
HB_SCRIPT_COMMON = 0
cdef extern from "hb-ot-tag.h" :
hb_script_t hb_ot_tag_to_script (hb_tag_t tag)
cdef extern from "hb-buffer.h" :
ctypedef struct hb_buffer_t :
pass
ctypedef struct hb_glyph_info_t :
hb_codepoint_t codepoint
hb_mask_t mask
unsigned long cluster
ctypedef union hb_var_int_t:
unsigned long u32
ctypedef struct hb_glyph_position_t :
hb_position_t x_advance
hb_position_t y_advance
hb_position_t x_offset
hb_position_t y_offset
hb_var_int_t var
hb_buffer_t *hb_buffer_create(unsigned int size)
hb_buffer_t *hb_buffer_reference(hb_buffer_t *buffer)
unsigned int hb_buffer_get_reference_count(hb_buffer_t *buffer)
void hb_buffer_destroy(hb_buffer_t *buffer)
void hb_buffer_set_direction(hb_buffer_t *buffer, hb_direction_t direction)
hb_direction_t hb_buffer_get_direction(hb_buffer_t *buffer)
void hb_buffer_set_script(hb_buffer_t *buffer, hb_script_t script)
hb_script_t hb_buffer_get_script(hb_buffer_t *buffer)
void hb_buffer_set_language(hb_buffer_t *buffer, hb_language_t language)
hb_language_t hb_buffer_get_language(hb_buffer_t *buffer)
void hb_buffer_clear(hb_buffer_t *)
void hb_buffer_clear_positions(hb_buffer_t *buffer)
void hb_buffer_ensure(hb_buffer_t *buffer, unsigned int size)
void hb_buffer_reverse(hb_buffer_t *buffer)
void hb_buffer_reverse_clusters(hb_buffer_t *buffer)
void hb_buffer_add_glyph(hb_buffer_t *buffer, hb_codepoint_t codepoint, hb_mask_t mask, unsigned int cluster)
void hb_buffer_add_utf8(hb_buffer_t *buffer, char *text, unsigned int text_length, unsigned int item_offset, unsigned int item_length)
unsigned int hb_buffer_get_length(hb_buffer_t *buffer)
hb_glyph_info_t *hb_buffer_get_glyph_infos(hb_buffer_t *buffer, unsigned int *len)
hb_glyph_position_t *hb_buffer_get_glyph_positions(hb_buffer_t *buffer, unsigned int *len)
cdef extern from "hb-blob.h" :
cdef struct hb_blob_t :
pass
# do I need blob functions here?
cdef extern from "hb-font.h" :
ctypedef struct hb_face_t :
pass
ctypedef struct hb_font_t :
pass
ctypedef hb_blob_t * (*hb_get_table_func_t) (hb_tag_t tag, void *user_data)
hb_face_t * hb_face_create_for_data(hb_blob_t *blob, unsigned int index)
hb_face_t * hb_face_create_for_tables(hb_get_table_func_t get_table, hb_destroy_func_t destroy, void *user_data)
hb_face_t * hb_face_reference(hb_face_t *face)
unsigned int hb_face_get_reference_count(hb_face_t *face)
void hb_face_destroy(hb_face_t *face)
void hb_font_destroy(hb_font_t *font)
hb_blob_t * hb_face_get_table(hb_face_t *face, hb_tag_t tag)
cdef extern from "hb-shape.h" :
ctypedef struct hb_feature_t :
int tag
unsigned int value
unsigned int start
unsigned int end
void hb_shape (hb_font_t *font, hb_buffer_t *buffer, hb_feature_t *features, unsigned int num_features)
cdef extern from "hb-ft.h" :
hb_face_t *hb_ft_face_create (FT_Face ft_face, hb_destroy_func_t destroy)
hb_font_t *hb_ft_font_create (FT_Face ft_face, hb_destroy_func_t destroy)
class glyphinfo :
def __init__(self, gid, cluster, advance, offset, internal = 0) :
self.gid = gid
self.cluster = cluster
self.advance = advance
self.offset = offset
self.internal = internal
def __repr__(self) :
res = "{0:d}>{1:d}@({2:.2f},{3:.2f})+({4:.2f},{5:.2f})".format(self.gid, self.cluster, self.offset[0], self.offset[1], self.advance[0], self.advance[1])
if self.internal : res += "/i=" + str(self.internal)
return res
cdef class buffer :
cdef hb_buffer_t *buffer
def __init__(self, char *text, unsigned int length) :
"""Note text must be a utf-8 string and length is number of chars"""
self.buffer = hb_buffer_create(length)
hb_buffer_add_utf8(self.buffer, text, length, 0, len(text))
def set_scriptlang(self, char *script, char *lang) :
cdef hb_language_t language
cdef hb_script_t scriptnum
language = hb_language_from_string(lang)
scriptnum = hb_ot_tag_to_script(hb_tag_from_string(script))
hb_buffer_set_script(self.buffer, scriptnum)
hb_buffer_set_language(self.buffer, language)
def get_info(self, scale = 1) :
cdef hb_glyph_info_t *infos
cdef hb_glyph_position_t *positions
cdef unsigned int num
cdef unsigned int i
res = []
num = hb_buffer_get_length(self.buffer)
infos = hb_buffer_get_glyph_infos(self.buffer, &num)
positions = hb_buffer_get_glyph_positions(self.buffer, &num)
for 0 <= i < num :
temp = glyphinfo(infos[i].codepoint, infos[i].cluster, (positions[i].x_advance / scale, positions[i].y_advance / scale), (positions[i].x_offset / scale, positions[i].y_offset / scale), positions[i].var.u32)
res.append(temp)
return res
def get_settings(self) :
cdef hb_script_t script
cdef hb_language_t lang
script = hb_buffer_get_script(self.buffer)
lang = hb_buffer_get_language(self.buffer)
return {'script' : script, 'language' : hb_language_to_string(lang)}
def __del__(self) :
hb_buffer_destroy(self.buffer)
cdef class ft :
cdef FT_Library engine
cdef FT_Face face
cdef hb_face_t *hbface
cdef hb_font_t *hbfont
def __init__(self, char *fname, size) :
cdef FT_Library engine
FT_Init_FreeType(&engine)
self.engine = engine
cdef FT_Face face
FT_New_Face(engine, fname, 0, &face)
FT_Set_Char_Size(face, size << 6, size << 6, 72, 72)
self.face = face
self.hbface = hb_ft_face_create(face, <void (*)(void *)>hb_face_destroy)
self.hbfont = hb_ft_font_create(face, <void (*)(void *)>hb_font_destroy)
def __del__(self) :
cdef FT_Library engine
engine = self.engine
cdef FT_Face face
face = self.face
FT_Done_Face(face)
FT_Done_FreeType(engine)
def shape(self, buffer aBuffer, features = {}) :
cdef hb_feature_t *feats
cdef hb_feature_t *aFeat
feats = <hb_feature_t *>malloc(sizeof(hb_feature_t) * len(features))
aFeat = feats
for k,v in features.items() :
aFeat.tag = hb_tag_from_string (k)
aFeat.value = int(v)
aFeat.start = 0
aFeat.end = -1
aFeat += 1
hb_shape(self.hbfont, aBuffer.buffer, feats, len(features))