contrib/python/lib/harfbuzz.pyx

   1 cdef extern from "stdlib.h":
   2     ctypedef int size_t
   3     void *malloc(size_t size)
   4     void free(void* ptr)
   5
   6 cdef extern from "ft2build.h" :
   7     pass
   8
   9 cdef extern from "freetype/freetype.h" :
  10     ctypedef void *FT_Library
  11     ctypedef void *FT_Face
  12     ctypedef int FT_Error
  13
  14     FT_Error FT_Init_FreeType (FT_Library *alib)
  15     FT_Error FT_Done_FreeType (FT_Library alib)
  16     FT_Error FT_Done_Face (FT_Face alib)
  17     FT_Error FT_New_Face( FT_Library library, char *path, unsigned long index, FT_Face *aface)
  18     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)
  19
  20 cdef extern from "hb-common.h" :
  21     cdef enum hb_direction_t :
  22         HB_DIRECTION_LTR
  23         HB_DIRECTION_RTL
  24         HB_DIRECTION_TTB
  25         HB_DIRECTION_BTT
  26     ctypedef unsigned long hb_codepoint_t
  27     ctypedef long hb_position_t
  28     ctypedef unsigned long hb_mask_t
  29     ctypedef unsigned long hb_tag_t
  30     hb_tag_t hb_tag_from_string (char *s)
  31     ctypedef void (*hb_destroy_func_t) (void *user_data)
  32
  33 cdef extern from "hb-unicode.h" :
  34 # there must be a better way of syncing this list with the true source
  35     ctypedef enum hb_script_t :
  36         HB_SCRIPT_COMMON = 0
  37
  38 cdef extern from "hb-language.h" :
  39     ctypedef void *hb_language_t
  40     hb_language_t hb_language_from_string(char *str)
  41     char * hb_language_to_string(hb_language_t language)
  42
  43 cdef extern from "hb-ot-tag.h" :
  44     hb_script_t hb_ot_tag_to_script (hb_tag_t tag)
  45
  46 cdef extern from "hb-buffer.h" :
  47     ctypedef struct hb_buffer_t :
  48         pass
  49
  50     ctypedef struct hb_glyph_info_t :
  51         hb_codepoint_t codepoint
  52         hb_mask_t mask
  53         unsigned long cluster
  54
  55     ctypedef union hb_var_int_t:
  56         unsigned long u32
  57
  58     ctypedef struct hb_glyph_position_t :
  59         hb_position_t x_advance
  60         hb_position_t y_advance
  61         hb_position_t x_offset
  62         hb_position_t y_offset
  63         hb_var_int_t  var
  64
  65     hb_buffer_t *hb_buffer_create(unsigned int size)
  66     hb_buffer_t *hb_buffer_reference(hb_buffer_t *buffer)
  67     unsigned int hb_buffer_get_reference_count(hb_buffer_t *buffer)
  68     void hb_buffer_destroy(hb_buffer_t *buffer)
  69     void hb_buffer_set_direction(hb_buffer_t *buffer, hb_direction_t direction)
  70     hb_direction_t hb_buffer_get_direction(hb_buffer_t *buffer)
  71     void hb_buffer_set_script(hb_buffer_t *buffer, hb_script_t script)
  72     hb_script_t hb_buffer_get_script(hb_buffer_t *buffer)
  73     void hb_buffer_set_language(hb_buffer_t *buffer, hb_language_t language)
  74     hb_language_t hb_buffer_get_language(hb_buffer_t *buffer)
  75     void hb_buffer_clear(hb_buffer_t *)
  76     void hb_buffer_clear_positions(hb_buffer_t *buffer)
  77     void hb_buffer_ensure(hb_buffer_t *buffer, unsigned int size)
  78     void hb_buffer_reverse(hb_buffer_t *buffer)
  79     void hb_buffer_reverse_clusters(hb_buffer_t *buffer)
  80     void hb_buffer_add_glyph(hb_buffer_t *buffer, hb_codepoint_t codepoint, hb_mask_t mask, unsigned int cluster)
  81     void hb_buffer_add_utf8(hb_buffer_t *buffer, char *text, unsigned int text_length, unsigned int item_offset, unsigned int item_length)
  82     unsigned int hb_buffer_get_length(hb_buffer_t *buffer)
  83     hb_glyph_info_t *hb_buffer_get_glyph_infos(hb_buffer_t *buffer)
  84     hb_glyph_position_t *hb_buffer_get_glyph_positions(hb_buffer_t *buffer)
  85
  86 cdef extern from "hb-blob.h" :
  87     cdef struct hb_blob_t :
  88         pass
  89 # do I need blob functions here?
  90
  91 cdef extern from "hb-font.h" :
  92     ctypedef struct hb_face_t :
  93         pass
  94     ctypedef struct hb_font_t :
  95         pass
  96
  97     ctypedef hb_blob_t * (*hb_get_table_func_t) (hb_tag_t tag, void *user_data)
  98     hb_face_t * hb_face_create_for_data(hb_blob_t *blob, unsigned int index)
  99     hb_face_t * hb_face_create_for_tables(hb_get_table_func_t get_table, hb_destroy_func_t destroy, void *user_data)
 100     hb_face_t * hb_face_reference(hb_face_t *face)
 101     unsigned int hb_face_get_reference_count(hb_face_t *face)
 102     void hb_face_destroy(hb_face_t *face)
 103     void hb_font_destroy(hb_font_t *font)
 104     hb_blob_t * hb_face_get_table(hb_face_t *face, hb_tag_t tag)
 105
 106
 107 cdef extern from "hb-shape.h" :
 108     ctypedef struct hb_feature_t :
 109         int tag
 110         unsigned int value
 111         unsigned int start
 112         unsigned int end
 113
 114     void hb_shape (hb_font_t *font, hb_face_t *face, hb_buffer_t *buffer, hb_feature_t *features, unsigned int num_features)
 115
 116 cdef extern from "hb-ft.h" :
 117     hb_face_t *hb_ft_face_create (FT_Face ft_face, hb_destroy_func_t destroy)
 118     hb_font_t *hb_ft_font_create (FT_Face ft_face, hb_destroy_func_t destroy)
 119
 120 class glyphinfo :
 121
 122     def __init__(self, gid, cluster, advance, offset, internal = 0) :
 123         self.gid = gid
 124         self.cluster = cluster
 125         self.advance = advance
 126         self.offset = offset
 127         self.internal = internal
 128
 129     def __repr__(self) :
 130         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])
 131         if self.internal : res += "/i=" + str(self.internal)
 132         return res
 133
 134 cdef class buffer :
 135     cdef hb_buffer_t *buffer
 136
 137     def __init__(self, char *text, unsigned int length) :
 138         """Note text must be a utf-8 string and length is number of chars"""
 139         self.buffer = hb_buffer_create(length)
 140         hb_buffer_add_utf8(self.buffer, text, length, 0, len(text))
 141
 142     def set_scriptlang(self, char *script, char *lang) :
 143         cdef hb_language_t language
 144         cdef hb_script_t scriptnum
 145
 146         language = hb_language_from_string(lang)
 147         scriptnum = hb_ot_tag_to_script(hb_tag_from_string(script))
 148         hb_buffer_set_script(self.buffer, scriptnum)
 149         hb_buffer_set_language(self.buffer, language)
 150
 151     def get_info(self, scale = 1) :
 152         cdef hb_glyph_info_t *infos
 153         cdef hb_glyph_position_t *positions
 154         cdef unsigned int num
 155         cdef unsigned int i
 156         res = []
 157
 158         num = hb_buffer_get_length(self.buffer)
 159         infos = hb_buffer_get_glyph_infos(self.buffer)
 160         positions = hb_buffer_get_glyph_positions(self.buffer)
 161         for 0 <= i < num :
 162             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)
 163             res.append(temp)
 164         return res
 165
 166     def get_settings(self) :
 167         cdef hb_script_t script
 168         cdef hb_language_t lang
 169
 170         script = hb_buffer_get_script(self.buffer)
 171         lang = hb_buffer_get_language(self.buffer)
 172         return {'script' : script, 'language' : hb_language_to_string(lang)}
 173
 174     def __del__(self) :
 175         hb_buffer_destroy(self.buffer)
 176
 177 cdef class ft :
 178     cdef FT_Library engine
 179     cdef FT_Face face
 180     cdef hb_face_t *hbface
 181     cdef hb_font_t *hbfont
 182
 183     def __init__(self, char *fname, size) :
 184         cdef FT_Library engine
 185         FT_Init_FreeType(&engine)
 186         self.engine = engine
 187         cdef FT_Face face
 188         FT_New_Face(engine, fname, 0, &face)
 189         FT_Set_Char_Size(face, size << 6, size << 6, 72, 72)
 190         self.face = face
 191         self.hbface = hb_ft_face_create(face, <void (*)(void *)>hb_face_destroy)
 192         self.hbfont = hb_ft_font_create(face, <void (*)(void *)>hb_font_destroy)
 193
 194     def __del__(self) :
 195         cdef FT_Library engine
 196         engine = self.engine
 197         cdef FT_Face face
 198         face = self.face
 199         FT_Done_Face(face)
 200         FT_Done_FreeType(engine)
 201
 202     def shape(self, buffer aBuffer, features = {}) :
 203         cdef hb_feature_t *feats
 204         cdef hb_feature_t *aFeat
 205         feats = <hb_feature_t *>malloc(sizeof(hb_feature_t) * len(features))
 206         aFeat = feats
 207         for k,v in features.items() :
 208             aFeat.tag = hb_tag_from_string (k)
 209             aFeat.value = int(v)
 210             aFeat.start = 0
 211             aFeat.end = -1
 212             aFeat += 1
 213         hb_shape(self.hbfont, self.hbface, aBuffer.buffer, feats, len(features))
 214
 215