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