1202 lines
41 KiB
Python
1202 lines
41 KiB
Python
# coding: utf-8
|
|
"""
|
|
weasyprint.text
|
|
---------------
|
|
|
|
Interface with Pango to decide where to do line breaks and to draw text.
|
|
|
|
:copyright: Copyright 2011-2014 Simon Sapin and contributors, see AUTHORS.
|
|
:license: BSD, see LICENSE for details.
|
|
|
|
"""
|
|
|
|
from __future__ import division
|
|
|
|
import re
|
|
import warnings
|
|
|
|
import cairocffi as cairo
|
|
import cffi
|
|
import pyphen
|
|
|
|
from .compat import basestring
|
|
from .logger import LOGGER
|
|
|
|
# XXX No unicode_literals, cffi likes native strings
|
|
|
|
if cairo.cairo_version() <= 11400:
|
|
warnings.warn('There are known rendering problems with Cairo <= 1.14.0')
|
|
|
|
|
|
PANGO_ATTR_FONT_FEATURES_CACHE = {}
|
|
|
|
|
|
ffi = cffi.FFI()
|
|
ffi.cdef('''
|
|
// Cairo
|
|
|
|
typedef enum {
|
|
CAIRO_FONT_TYPE_TOY,
|
|
CAIRO_FONT_TYPE_FT,
|
|
CAIRO_FONT_TYPE_WIN32,
|
|
CAIRO_FONT_TYPE_QUARTZ,
|
|
CAIRO_FONT_TYPE_USER
|
|
} cairo_font_type_t;
|
|
|
|
|
|
// Pango
|
|
|
|
typedef unsigned int guint;
|
|
typedef int gint;
|
|
typedef char gchar;
|
|
typedef gint gboolean;
|
|
typedef void* gpointer;
|
|
typedef ... cairo_t;
|
|
typedef ... PangoLayout;
|
|
typedef ... PangoContext;
|
|
typedef ... PangoFontMap;
|
|
typedef ... PangoFontMetrics;
|
|
typedef ... PangoLanguage;
|
|
typedef ... PangoTabArray;
|
|
typedef ... PangoFontDescription;
|
|
typedef ... PangoLayoutIter;
|
|
typedef ... PangoAttrList;
|
|
typedef ... PangoAttrClass;
|
|
|
|
typedef enum {
|
|
PANGO_STYLE_NORMAL,
|
|
PANGO_STYLE_OBLIQUE,
|
|
PANGO_STYLE_ITALIC
|
|
} PangoStyle;
|
|
|
|
typedef enum {
|
|
PANGO_WEIGHT_THIN = 100,
|
|
PANGO_WEIGHT_ULTRALIGHT = 200,
|
|
PANGO_WEIGHT_LIGHT = 300,
|
|
PANGO_WEIGHT_BOOK = 380,
|
|
PANGO_WEIGHT_NORMAL = 400,
|
|
PANGO_WEIGHT_MEDIUM = 500,
|
|
PANGO_WEIGHT_SEMIBOLD = 600,
|
|
PANGO_WEIGHT_BOLD = 700,
|
|
PANGO_WEIGHT_ULTRABOLD = 800,
|
|
PANGO_WEIGHT_HEAVY = 900,
|
|
PANGO_WEIGHT_ULTRAHEAVY = 1000
|
|
} PangoWeight;
|
|
|
|
typedef enum {
|
|
PANGO_STRETCH_ULTRA_CONDENSED,
|
|
PANGO_STRETCH_EXTRA_CONDENSED,
|
|
PANGO_STRETCH_CONDENSED,
|
|
PANGO_STRETCH_SEMI_CONDENSED,
|
|
PANGO_STRETCH_NORMAL,
|
|
PANGO_STRETCH_SEMI_EXPANDED,
|
|
PANGO_STRETCH_EXPANDED,
|
|
PANGO_STRETCH_EXTRA_EXPANDED,
|
|
PANGO_STRETCH_ULTRA_EXPANDED
|
|
} PangoStretch;
|
|
|
|
typedef enum {
|
|
PANGO_WRAP_WORD,
|
|
PANGO_WRAP_CHAR,
|
|
PANGO_WRAP_WORD_CHAR
|
|
} PangoWrapMode;
|
|
|
|
typedef enum {
|
|
PANGO_TAB_LEFT
|
|
} PangoTabAlign;
|
|
|
|
typedef struct {
|
|
const PangoAttrClass *klass;
|
|
guint start_index;
|
|
guint end_index;
|
|
} PangoAttribute;
|
|
|
|
typedef struct {
|
|
PangoLayout *layout;
|
|
gint start_index;
|
|
gint length;
|
|
/* ... */
|
|
} PangoLayoutLine;
|
|
|
|
typedef struct {
|
|
int x;
|
|
int y;
|
|
int width;
|
|
int height;
|
|
} PangoRectangle;
|
|
|
|
typedef struct {
|
|
guint is_line_break: 1;
|
|
/* ... */
|
|
} PangoLogAttr;
|
|
|
|
int pango_version (void);
|
|
|
|
double pango_units_to_double (int i);
|
|
int pango_units_from_double (double d);
|
|
void g_object_unref (gpointer object);
|
|
void g_type_init (void);
|
|
|
|
void pango_layout_set_width (PangoLayout *layout, int width);
|
|
void pango_layout_set_attributes (
|
|
PangoLayout *layout, PangoAttrList *attrs);
|
|
void pango_layout_set_text (
|
|
PangoLayout *layout, const char *text, int length);
|
|
void pango_layout_set_tabs (
|
|
PangoLayout *layout, PangoTabArray *tabs);
|
|
void pango_layout_set_font_description (
|
|
PangoLayout *layout, const PangoFontDescription *desc);
|
|
void pango_layout_set_wrap (
|
|
PangoLayout *layout, PangoWrapMode wrap);
|
|
|
|
PangoLayoutIter * pango_layout_get_iter (PangoLayout *layout);
|
|
void pango_layout_iter_free (PangoLayoutIter *iter);
|
|
gboolean pango_layout_iter_next_line (PangoLayoutIter *iter);
|
|
PangoLayoutLine * pango_layout_iter_get_line_readonly (
|
|
PangoLayoutIter *iter);
|
|
int pango_layout_iter_get_baseline (PangoLayoutIter *iter);
|
|
|
|
PangoFontDescription * pango_font_description_new (void);
|
|
void pango_font_description_free (PangoFontDescription *desc);
|
|
void pango_font_description_set_family (
|
|
PangoFontDescription *desc, const char *family);
|
|
void pango_font_description_set_style (
|
|
PangoFontDescription *desc, PangoStyle style);
|
|
void pango_font_description_set_stretch (
|
|
PangoFontDescription *desc, PangoStretch stretch);
|
|
void pango_font_description_set_weight (
|
|
PangoFontDescription *desc, PangoWeight weight);
|
|
void pango_font_description_set_absolute_size (
|
|
PangoFontDescription *desc, double size);
|
|
|
|
PangoFontMetrics * pango_context_get_metrics (
|
|
PangoContext *context, const PangoFontDescription *desc,
|
|
PangoLanguage *language);
|
|
void pango_font_metrics_unref (PangoFontMetrics *metrics);
|
|
int pango_font_metrics_get_ascent (PangoFontMetrics *metrics);
|
|
int pango_font_metrics_get_descent (PangoFontMetrics *metrics);
|
|
int pango_font_metrics_get_approximate_char_width (
|
|
PangoFontMetrics *metrics);
|
|
int pango_font_metrics_get_approximate_digit_width (
|
|
PangoFontMetrics *metrics);
|
|
int pango_font_metrics_get_underline_thickness (
|
|
PangoFontMetrics *metrics);
|
|
int pango_font_metrics_get_underline_position (
|
|
PangoFontMetrics *metrics);
|
|
int pango_font_metrics_get_strikethrough_thickness (
|
|
PangoFontMetrics *metrics);
|
|
int pango_font_metrics_get_strikethrough_position (
|
|
PangoFontMetrics *metrics);
|
|
|
|
PangoAttrList * pango_attr_list_new (void);
|
|
void pango_attr_list_unref (PangoAttrList *list);
|
|
void pango_attr_list_insert (
|
|
PangoAttrList *list, PangoAttribute *attr);
|
|
PangoAttribute * pango_attr_font_features_new (const gchar *features);
|
|
PangoAttribute * pango_attr_letter_spacing_new (int letter_spacing);
|
|
void pango_attribute_destroy (PangoAttribute *attr);
|
|
|
|
PangoTabArray * pango_tab_array_new_with_positions (
|
|
gint size, gboolean positions_in_pixels, PangoTabAlign first_alignment,
|
|
gint first_position, ...);
|
|
void pango_tab_array_free (PangoTabArray *tab_array);
|
|
|
|
PangoLanguage * pango_language_from_string (const char *language);
|
|
PangoLanguage * pango_language_get_default (void);
|
|
void pango_context_set_language (
|
|
PangoContext *context, PangoLanguage *language);
|
|
void pango_context_set_font_map (
|
|
PangoContext *context, PangoFontMap *font_map);
|
|
|
|
void pango_layout_line_get_extents (
|
|
PangoLayoutLine *line,
|
|
PangoRectangle *ink_rect, PangoRectangle *logical_rect);
|
|
|
|
PangoContext * pango_layout_get_context (PangoLayout *layout);
|
|
|
|
void pango_get_log_attrs (
|
|
const char *text, int length, int level, PangoLanguage *language,
|
|
PangoLogAttr *log_attrs, int attrs_len);
|
|
|
|
|
|
// PangoCairo
|
|
|
|
PangoLayout * pango_cairo_create_layout (cairo_t *cr);
|
|
void pango_cairo_update_layout (cairo_t *cr, PangoLayout *layout);
|
|
void pango_cairo_show_layout_line (cairo_t *cr, PangoLayoutLine *line);
|
|
''')
|
|
|
|
|
|
def dlopen(ffi, *names):
|
|
"""Try various names for the same library, for different platforms."""
|
|
for name in names:
|
|
try:
|
|
return ffi.dlopen(name)
|
|
except OSError:
|
|
pass
|
|
# Re-raise the exception.
|
|
return ffi.dlopen(names[0]) # pragma: no cover
|
|
|
|
|
|
gobject = dlopen(ffi, 'gobject-2.0', 'libgobject-2.0-0', 'libgobject-2.0.so',
|
|
'libgobject-2.0.dylib')
|
|
pango = dlopen(ffi, 'pango-1.0', 'libpango-1.0-0', 'libpango-1.0.so',
|
|
'libpango-1.0.dylib')
|
|
pangocairo = dlopen(ffi, 'pangocairo-1.0', 'libpangocairo-1.0-0',
|
|
'libpangocairo-1.0.so', 'libpangocairo-1.0.dylib')
|
|
|
|
gobject.g_type_init()
|
|
|
|
units_to_double = pango.pango_units_to_double
|
|
units_from_double = pango.pango_units_from_double
|
|
|
|
PYPHEN_DICTIONARY_CACHE = {}
|
|
|
|
|
|
PANGO_STYLE = {
|
|
'normal': pango.PANGO_STYLE_NORMAL,
|
|
'oblique': pango.PANGO_STYLE_OBLIQUE,
|
|
'italic': pango.PANGO_STYLE_ITALIC,
|
|
}
|
|
|
|
PANGO_STRETCH = {
|
|
'ultra-condensed': pango.PANGO_STRETCH_ULTRA_CONDENSED,
|
|
'extra-condensed': pango.PANGO_STRETCH_EXTRA_CONDENSED,
|
|
'condensed': pango.PANGO_STRETCH_CONDENSED,
|
|
'semi-condensed': pango.PANGO_STRETCH_SEMI_CONDENSED,
|
|
'normal': pango.PANGO_STRETCH_NORMAL,
|
|
'semi-expanded': pango.PANGO_STRETCH_SEMI_EXPANDED,
|
|
'expanded': pango.PANGO_STRETCH_EXPANDED,
|
|
'extra-expanded': pango.PANGO_STRETCH_EXTRA_EXPANDED,
|
|
'ultra-expanded': pango.PANGO_STRETCH_ULTRA_EXPANDED,
|
|
}
|
|
|
|
PANGO_WRAP_MODE = {
|
|
'WRAP_WORD': pango.PANGO_WRAP_WORD,
|
|
'WRAP_CHAR': pango.PANGO_WRAP_CHAR,
|
|
'WRAP_WORD_CHAR': pango.PANGO_WRAP_WORD_CHAR
|
|
}
|
|
|
|
# From http://www.microsoft.com/typography/otspec/languagetags.htm
|
|
LST_TO_ISO = {
|
|
'aba': 'abq',
|
|
'afk': 'afr',
|
|
'afr': 'aar',
|
|
'agw': 'ahg',
|
|
'als': 'gsw',
|
|
'alt': 'atv',
|
|
'ari': 'aiw',
|
|
'ark': 'mhv',
|
|
'ath': 'apk',
|
|
'avr': 'ava',
|
|
'bad': 'bfq',
|
|
'bad0': 'bad',
|
|
'bag': 'bfy',
|
|
'bal': 'krc',
|
|
'bau': 'bci',
|
|
'bch': 'bcq',
|
|
'bgr': 'bul',
|
|
'bil': 'byn',
|
|
'bkf': 'bla',
|
|
'bli': 'bal',
|
|
'bln': 'bjt',
|
|
'blt': 'bft',
|
|
'bmb': 'bam',
|
|
'bri': 'bra',
|
|
'brm': 'mya',
|
|
'bsh': 'bak',
|
|
'bti': 'btb',
|
|
'chg': 'sgw',
|
|
'chh': 'hne',
|
|
'chi': 'nya',
|
|
'chk': 'ckt',
|
|
'chk0': 'chk',
|
|
'chu': 'chv',
|
|
'chy': 'chy',
|
|
'cmr': 'swb',
|
|
'crr': 'crx',
|
|
'crt': 'crh',
|
|
'csl': 'chu',
|
|
'csy': 'ces',
|
|
'dcr': 'cwd',
|
|
'dgr': 'doi',
|
|
'djr': 'dje',
|
|
'djr0': 'djr',
|
|
'dng': 'ada',
|
|
'dnk': 'din',
|
|
'dri': 'prs',
|
|
'dun': 'dng',
|
|
'dzn': 'dzo',
|
|
'ebi': 'igb',
|
|
'ecr': 'crj',
|
|
'edo': 'bin',
|
|
'erz': 'myv',
|
|
'esp': 'spa',
|
|
'eti': 'est',
|
|
'euq': 'eus',
|
|
'evk': 'evn',
|
|
'evn': 'eve',
|
|
'fan': 'acf',
|
|
'fan0': 'fan',
|
|
'far': 'fas',
|
|
'fji': 'fij',
|
|
'fle': 'vls',
|
|
'fne': 'enf',
|
|
'fos': 'fao',
|
|
'fri': 'fry',
|
|
'frl': 'fur',
|
|
'frp': 'frp',
|
|
'fta': 'fuf',
|
|
'gad': 'gaa',
|
|
'gae': 'gla',
|
|
'gal': 'glg',
|
|
'gaw': 'gbm',
|
|
'gil': 'niv',
|
|
'gil0': 'gil',
|
|
'gmz': 'guk',
|
|
'grn': 'kal',
|
|
'gro': 'grt',
|
|
'gua': 'grn',
|
|
'hai': 'hat',
|
|
'hal': 'flm',
|
|
'har': 'hoj',
|
|
'hbn': 'amf',
|
|
'hma': 'mrj',
|
|
'hnd': 'hno',
|
|
'ho': 'hoc',
|
|
'hri': 'har',
|
|
'hye0': 'hye',
|
|
'ijo': 'ijc',
|
|
'ing': 'inh',
|
|
'inu': 'iku',
|
|
'iri': 'gle',
|
|
'irt': 'gle',
|
|
'ism': 'smn',
|
|
'iwr': 'heb',
|
|
'jan': 'jpn',
|
|
'jii': 'yid',
|
|
'jud': 'lad',
|
|
'jul': 'dyu',
|
|
'kab': 'kbd',
|
|
'kab0': 'kab',
|
|
'kac': 'kfr',
|
|
'kal': 'kln',
|
|
'kar': 'krc',
|
|
'keb': 'ktb',
|
|
'kge': 'kat',
|
|
'kha': 'kjh',
|
|
'khk': 'kca',
|
|
'khs': 'kca',
|
|
'khv': 'kca',
|
|
'kis': 'kqs',
|
|
'kkn': 'kex',
|
|
'klm': 'xal',
|
|
'kmb': 'kam',
|
|
'kmn': 'kfy',
|
|
'kmo': 'kmw',
|
|
'kms': 'kxc',
|
|
'knr': 'kau',
|
|
'kod': 'kfa',
|
|
'koh': 'okm',
|
|
'kon': 'ktu',
|
|
'kon0': 'kon',
|
|
'kop': 'koi',
|
|
'koz': 'kpv',
|
|
'kpl': 'kpe',
|
|
'krk': 'kaa',
|
|
'krm': 'kdr',
|
|
'krn': 'kar',
|
|
'krt': 'kqy',
|
|
'ksh': 'kas',
|
|
'ksh0': 'ksh',
|
|
'ksi': 'kha',
|
|
'ksm': 'sjd',
|
|
'kui': 'kxu',
|
|
'kul': 'kfx',
|
|
'kuu': 'kru',
|
|
'kuy': 'kdt',
|
|
'kyk': 'kpy',
|
|
'lad': 'lld',
|
|
'lah': 'bfu',
|
|
'lak': 'lbe',
|
|
'lam': 'lmn',
|
|
'laz': 'lzz',
|
|
'lcr': 'crm',
|
|
'ldk': 'lbj',
|
|
'lma': 'mhr',
|
|
'lmb': 'lif',
|
|
'lmw': 'ngl',
|
|
'lsb': 'dsb',
|
|
'lsm': 'smj',
|
|
'lth': 'lit',
|
|
'luh': 'luy',
|
|
'lvi': 'lav',
|
|
'maj': 'mpe',
|
|
'mak': 'vmw',
|
|
'man': 'mns',
|
|
'map': 'arn',
|
|
'maw': 'mwr',
|
|
'mbn': 'kmb',
|
|
'mch': 'mnc',
|
|
'mcr': 'crm',
|
|
'mde': 'men',
|
|
'men': 'mym',
|
|
'miz': 'lus',
|
|
'mkr': 'mak',
|
|
'mle': 'mdy',
|
|
'mln': 'mlq',
|
|
'mlr': 'mal',
|
|
'mly': 'msa',
|
|
'mnd': 'mnk',
|
|
'mng': 'mon',
|
|
'mnk': 'man',
|
|
'mnx': 'glv',
|
|
'mok': 'mdf',
|
|
'mon': 'mnw',
|
|
'mth': 'mai',
|
|
'mts': 'mlt',
|
|
'mun': 'unr',
|
|
'nan': 'gld',
|
|
'nas': 'nsk',
|
|
'ncr': 'csw',
|
|
'ndg': 'ndo',
|
|
'nhc': 'csw',
|
|
'nis': 'dap',
|
|
'nkl': 'nyn',
|
|
'nko': 'nqo',
|
|
'nor': 'nob',
|
|
'nsm': 'sme',
|
|
'nta': 'nod',
|
|
'nto': 'epo',
|
|
'nyn': 'nno',
|
|
'ocr': 'ojs',
|
|
'ojb': 'oji',
|
|
'oro': 'orm',
|
|
'paa': 'sam',
|
|
'pal': 'pli',
|
|
'pap': 'plp',
|
|
'pap0': 'pap',
|
|
'pas': 'pus',
|
|
'pgr': 'ell',
|
|
'pil': 'fil',
|
|
'plg': 'pce',
|
|
'plk': 'pol',
|
|
'ptg': 'por',
|
|
'qin': 'bgr',
|
|
'rbu': 'bxr',
|
|
'rcr': 'atj',
|
|
'rms': 'roh',
|
|
'rom': 'ron',
|
|
'roy': 'rom',
|
|
'rsy': 'rue',
|
|
'rua': 'kin',
|
|
'sad': 'sck',
|
|
'say': 'chp',
|
|
'sek': 'xan',
|
|
'sel': 'sel',
|
|
'sgo': 'sag',
|
|
'sgs': 'sgs',
|
|
'sib': 'sjo',
|
|
'sig': 'xst',
|
|
'sks': 'sms',
|
|
'sky': 'slk',
|
|
'sla': 'scs',
|
|
'sml': 'som',
|
|
'sna': 'seh',
|
|
'sna0': 'sna',
|
|
'snh': 'sin',
|
|
'sog': 'gru',
|
|
'srb': 'srp',
|
|
'ssl': 'xsl',
|
|
'ssm': 'sma',
|
|
'sur': 'suq',
|
|
'sve': 'swe',
|
|
'swa': 'aii',
|
|
'swk': 'swa',
|
|
'swz': 'ssw',
|
|
'sxt': 'ngo',
|
|
'taj': 'tgk',
|
|
'tcr': 'cwd',
|
|
'tgn': 'ton',
|
|
'tgr': 'tig',
|
|
'tgy': 'tir',
|
|
'tht': 'tah',
|
|
'tib': 'bod',
|
|
'tkm': 'tuk',
|
|
'tmn': 'tem',
|
|
'tna': 'tsn',
|
|
'tne': 'enh',
|
|
'tng': 'toi',
|
|
'tod': 'xal',
|
|
'tod0': 'tod',
|
|
'trk': 'tur',
|
|
'tsg': 'tso',
|
|
'tua': 'tru',
|
|
'tul': 'tcy',
|
|
'tuv': 'tyv',
|
|
'twi': 'aka',
|
|
'usb': 'hsb',
|
|
'uyg': 'uig',
|
|
'vit': 'vie',
|
|
'vro': 'vro',
|
|
'wa': 'wbm',
|
|
'wag': 'wbr',
|
|
'wcr': 'crk',
|
|
'wel': 'cym',
|
|
'wlf': 'wol',
|
|
'xbd': 'khb',
|
|
'xhs': 'xho',
|
|
'yak': 'sah',
|
|
'yba': 'yor',
|
|
'ycr': 'cre',
|
|
'yim': 'iii',
|
|
'zhh': 'zho',
|
|
'zhp': 'zho',
|
|
'zhs': 'zho',
|
|
'zht': 'zho',
|
|
'znd': 'zne',
|
|
}
|
|
|
|
|
|
def utf8_slice(string, slice_):
|
|
return string.encode('utf-8')[slice_].decode('utf-8')
|
|
|
|
|
|
def unicode_to_char_p(string):
|
|
"""Return ``(pointer, bytestring)``.
|
|
|
|
The byte string must live at least as long as the pointer is used.
|
|
|
|
"""
|
|
bytestring = string.encode('utf8').replace(b'\x00', b'')
|
|
return ffi.new('char[]', bytestring), bytestring
|
|
|
|
|
|
def get_size(line, style):
|
|
logical_extents = ffi.new('PangoRectangle *')
|
|
pango.pango_layout_line_get_extents(line, ffi.NULL, logical_extents)
|
|
width, height = (units_to_double(logical_extents.width),
|
|
units_to_double(logical_extents.height))
|
|
if style['letter_spacing'] != 'normal':
|
|
width += style['letter_spacing']
|
|
return width, height
|
|
|
|
|
|
def get_ink_position(line):
|
|
ink_extents = ffi.new('PangoRectangle *')
|
|
pango.pango_layout_line_get_extents(line, ink_extents, ffi.NULL)
|
|
return (units_to_double(ink_extents.x), units_to_double(ink_extents.y))
|
|
|
|
|
|
def first_line_metrics(first_line, text, layout, resume_at, space_collapse,
|
|
style, hyphenated=False, hyphenation_character=None):
|
|
length = first_line.length
|
|
if hyphenated:
|
|
length -= len(hyphenation_character.encode('utf8'))
|
|
elif resume_at:
|
|
# Set an infinite width as we don't want to break lines when drawing,
|
|
# the lines have already been split and the size may differ.
|
|
pango.pango_layout_set_width(layout.layout, -1)
|
|
# Create layout with final text
|
|
first_line_text = utf8_slice(text, slice(length))
|
|
# Remove trailing spaces if spaces collapse
|
|
if space_collapse:
|
|
first_line_text = first_line_text.rstrip(u' ')
|
|
# Remove soft hyphens
|
|
layout.set_text(first_line_text.replace(u'\u00ad', u''))
|
|
first_line = next(layout.iter_lines(), None)
|
|
length = first_line.length if first_line is not None else 0
|
|
soft_hyphens = 0
|
|
if u'\u00ad' in first_line_text:
|
|
if first_line_text[0] == u'\u00ad':
|
|
length += 2 # len(u'\u00ad'.encode('utf8'))
|
|
for i in range(len(layout.text_bytes.decode('utf8'))):
|
|
while i + soft_hyphens + 1 < len(first_line_text):
|
|
if first_line_text[i + soft_hyphens + 1] == u'\u00ad':
|
|
soft_hyphens += 1
|
|
else:
|
|
break
|
|
length += soft_hyphens * 2 # len(u'\u00ad'.encode('utf8'))
|
|
width, height = get_size(first_line, style)
|
|
baseline = units_to_double(pango.pango_layout_iter_get_baseline(ffi.gc(
|
|
pango.pango_layout_get_iter(layout.layout),
|
|
pango.pango_layout_iter_free)))
|
|
return layout, length, resume_at, width, height, baseline
|
|
|
|
|
|
class Layout(object):
|
|
"""Object holding PangoLayout-related cdata pointers."""
|
|
def __init__(self, context, font_size, style):
|
|
self.context = context
|
|
hinting = context.enable_hinting if context else False
|
|
cairo_dummy_context = (
|
|
cairo.Context(cairo.ImageSurface(cairo.FORMAT_ARGB32, 1, 1))
|
|
if hinting else cairo.Context(cairo.PDFSurface(None, 1, 1)))
|
|
self.layout = ffi.gc(
|
|
pangocairo.pango_cairo_create_layout(ffi.cast(
|
|
'cairo_t *', cairo_dummy_context._pointer)),
|
|
gobject.g_object_unref)
|
|
pango_context = pango.pango_layout_get_context(self.layout)
|
|
if context and context.font_config.font_map:
|
|
pango.pango_context_set_font_map(
|
|
pango_context, context.font_config.font_map)
|
|
self.font = ffi.gc(
|
|
pango.pango_font_description_new(),
|
|
pango.pango_font_description_free)
|
|
if style['font_language_override'] != 'normal':
|
|
lang_p, lang = unicode_to_char_p(LST_TO_ISO.get(
|
|
style['font_language_override'].lower(),
|
|
style['font_language_override']))
|
|
elif style['lang']:
|
|
lang_p, lang = unicode_to_char_p(style['lang'])
|
|
else:
|
|
lang = None
|
|
self.language = pango.pango_language_get_default()
|
|
if lang:
|
|
self.language = pango.pango_language_from_string(lang_p)
|
|
pango.pango_context_set_language(pango_context, self.language)
|
|
|
|
assert not isinstance(style['font_family'], basestring), (
|
|
'font_family should be a list')
|
|
family_p, family = unicode_to_char_p(','.join(style['font_family']))
|
|
pango.pango_font_description_set_family(self.font, family_p)
|
|
pango.pango_font_description_set_style(
|
|
self.font, PANGO_STYLE[style['font_style']])
|
|
pango.pango_font_description_set_stretch(
|
|
self.font, PANGO_STRETCH[style['font_stretch']])
|
|
pango.pango_font_description_set_weight(
|
|
self.font, style['font_weight'])
|
|
pango.pango_font_description_set_absolute_size(
|
|
self.font, units_from_double(font_size))
|
|
pango.pango_layout_set_font_description(self.layout, self.font)
|
|
|
|
def iter_lines(self):
|
|
layout_iter = ffi.gc(
|
|
pango.pango_layout_get_iter(self.layout),
|
|
pango.pango_layout_iter_free)
|
|
while 1:
|
|
yield pango.pango_layout_iter_get_line_readonly(layout_iter)
|
|
if not pango.pango_layout_iter_next_line(layout_iter):
|
|
return
|
|
|
|
def set_text(self, text):
|
|
text, bytestring = unicode_to_char_p(text)
|
|
self.text = text
|
|
self.text_bytes = bytestring
|
|
pango.pango_layout_set_text(self.layout, text, -1)
|
|
|
|
def get_font_metrics(self):
|
|
context = pango.pango_layout_get_context(self.layout)
|
|
return FontMetrics(context, self.font, self.language)
|
|
|
|
def set_wrap(self, wrap_mode):
|
|
pango.pango_layout_set_wrap(self.layout, wrap_mode)
|
|
|
|
def set_tabs(self, style):
|
|
if isinstance(style.tab_size, int):
|
|
layout = Layout(
|
|
context=self.context, font_size=style.font_size,
|
|
style=style)
|
|
layout.set_text(' ' * style.tab_size)
|
|
line, = layout.iter_lines()
|
|
width, _ = get_size(line, style)
|
|
width = int(round(width))
|
|
else:
|
|
width = int(style.tab_size.value)
|
|
# TODO: 0 is not handled correctly by Pango
|
|
array = ffi.gc(
|
|
pango.pango_tab_array_new_with_positions(
|
|
1, True, pango.PANGO_TAB_LEFT, width or 1),
|
|
pango.pango_tab_array_free)
|
|
pango.pango_layout_set_tabs(self.layout, array)
|
|
|
|
|
|
class FontMetrics(object):
|
|
def __init__(self, context, font, language):
|
|
self.metrics = ffi.gc(
|
|
pango.pango_context_get_metrics(context, font, language),
|
|
pango.pango_font_metrics_unref)
|
|
|
|
def __dir__(self):
|
|
return ['ascent', 'descent',
|
|
'approximate_char_width', 'approximate_digit_width',
|
|
'underline_thickness', 'underline_position',
|
|
'strikethrough_thickness', 'strikethrough_position']
|
|
|
|
def __getattr__(self, key):
|
|
if key in dir(self):
|
|
return units_to_double(
|
|
getattr(pango, 'pango_font_metrics_get_' + key)(self.metrics))
|
|
|
|
|
|
def get_font_features(
|
|
font_kerning='normal', font_variant_ligatures='normal',
|
|
font_variant_position='normal', font_variant_caps='normal',
|
|
font_variant_numeric='normal', font_variant_alternates='normal',
|
|
font_variant_east_asian='normal', font_feature_settings='normal'):
|
|
"""Get the font features from the different properties in style.
|
|
|
|
See https://www.w3.org/TR/css-fonts-3/#feature-precedence
|
|
|
|
"""
|
|
features = {}
|
|
ligature_keys = {
|
|
'common-ligatures': ['liga', 'clig'],
|
|
'historical-ligatures': ['hlig'],
|
|
'discretionary-ligatures': ['dlig'],
|
|
'contextual': ['calt']}
|
|
caps_keys = {
|
|
'small-caps': ['smcp'],
|
|
'all-small-caps': ['c2sc', 'smcp'],
|
|
'petite-caps': ['pcap'],
|
|
'all-petite-caps': ['c2pc', 'pcap'],
|
|
'unicase': ['unic'],
|
|
'titling-caps': ['titl']}
|
|
numeric_keys = {
|
|
'lining-nums': 'lnum',
|
|
'oldstyle-nums': 'onum',
|
|
'proportional-nums': 'pnum',
|
|
'tabular-nums': 'tnum',
|
|
'diagonal-fractions': 'frac',
|
|
'stacked-fractions': 'afrc',
|
|
'ordinal': 'ordn',
|
|
'slashed-zero': 'zero'}
|
|
east_asian_keys = {
|
|
'jis78': 'jp78',
|
|
'jis83': 'jp83',
|
|
'jis90': 'jp90',
|
|
'jis04': 'jp04',
|
|
'simplified': 'smpl',
|
|
'traditional': 'trad',
|
|
'full-width': 'fwid',
|
|
'proportional-width': 'pwid',
|
|
'ruby': 'ruby'}
|
|
|
|
# Step 1: getting the default, we rely on Pango for this
|
|
# Step 2: @font-face font-variant, done in fonts.add_font_face
|
|
# Step 3: @font-face font-feature-settings, done in fonts.add_font_face
|
|
|
|
# Step 4: font-variant and OpenType features
|
|
|
|
if font_kerning != 'auto':
|
|
features['kern'] = int(font_kerning == 'normal')
|
|
|
|
if font_variant_ligatures == 'none':
|
|
for keys in ligature_keys.values():
|
|
for key in keys:
|
|
features[key] = 0
|
|
elif font_variant_ligatures != 'normal':
|
|
for ligature_type in font_variant_ligatures:
|
|
value = 1
|
|
if ligature_type.startswith('no-'):
|
|
value = 0
|
|
ligature_type = ligature_type[3:]
|
|
for key in ligature_keys[ligature_type]:
|
|
features[key] = value
|
|
|
|
if font_variant_position == 'sub':
|
|
# TODO: the specification asks for additional checks
|
|
# https://www.w3.org/TR/css-fonts-3/#font-variant-position-prop
|
|
features['subs'] = 1
|
|
elif font_variant_position == 'super':
|
|
features['sups'] = 1
|
|
|
|
if font_variant_caps != 'normal':
|
|
# TODO: the specification asks for additional checks
|
|
# https://www.w3.org/TR/css-fonts-3/#font-variant-caps-prop
|
|
for key in caps_keys[font_variant_caps]:
|
|
features[key] = 1
|
|
|
|
if font_variant_numeric != 'normal':
|
|
for key in font_variant_numeric:
|
|
features[numeric_keys[key]] = 1
|
|
|
|
if font_variant_alternates != 'normal':
|
|
# TODO: support other values
|
|
# See https://www.w3.org/TR/css-fonts-3/#font-variant-caps-prop
|
|
if font_variant_alternates == 'historical-forms':
|
|
features['hist'] = 1
|
|
|
|
if font_variant_east_asian != 'normal':
|
|
for key in font_variant_east_asian:
|
|
features[east_asian_keys[key]] = 1
|
|
|
|
# Step 5: incompatible non-OpenType features, already handled by Pango
|
|
|
|
# Step 6: font-feature-settings
|
|
|
|
if font_feature_settings != 'normal':
|
|
features.update(dict(font_feature_settings))
|
|
|
|
return features
|
|
|
|
|
|
def create_layout(text, style, context, max_width, justification_spacing):
|
|
"""Return an opaque Pango layout with default Pango line-breaks.
|
|
|
|
:param text: Unicode
|
|
:param style: a :class:`StyleDict` of computed values
|
|
:param hinting: whether to enable text hinting or not
|
|
:param max_width:
|
|
The maximum available width in the same unit as ``style.font_size``,
|
|
or ``None`` for unlimited width.
|
|
|
|
"""
|
|
text_wrap = style.white_space in ('normal', 'pre-wrap', 'pre-line')
|
|
if not text_wrap:
|
|
max_width = None
|
|
|
|
layout = Layout(context, style.font_size, style)
|
|
layout.set_text(text)
|
|
|
|
# Make sure that max_width * Pango.SCALE == max_width * 1024 fits in a
|
|
# signed integer. Treat bigger values same as None: unconstrained width.
|
|
if max_width is not None and max_width < 2 ** 21:
|
|
pango.pango_layout_set_width(
|
|
layout.layout, units_from_double(max_width))
|
|
|
|
text_bytes = layout.text_bytes
|
|
|
|
# Word and letter spacings
|
|
word_spacing = style.word_spacing + justification_spacing
|
|
letter_spacing = style.letter_spacing
|
|
if letter_spacing == 'normal':
|
|
letter_spacing = 0
|
|
if text and (word_spacing != 0 or letter_spacing != 0):
|
|
letter_spacing = units_from_double(letter_spacing)
|
|
space_spacing = units_from_double(word_spacing) + letter_spacing
|
|
attr_list = pango.pango_attr_list_new()
|
|
|
|
def add_attr(start, end, spacing):
|
|
# TODO: attributes should be freed
|
|
attr = pango.pango_attr_letter_spacing_new(spacing)
|
|
attr.start_index, attr.end_index = start, end
|
|
pango.pango_attr_list_insert(attr_list, attr)
|
|
|
|
add_attr(0, len(text_bytes) + 1, letter_spacing)
|
|
position = text_bytes.find(b' ')
|
|
while position != -1:
|
|
add_attr(position, position + 1, space_spacing)
|
|
position = text_bytes.find(b' ', position + 1)
|
|
|
|
pango.pango_layout_set_attributes(layout.layout, attr_list)
|
|
pango.pango_attr_list_unref(attr_list)
|
|
|
|
features = get_font_features(
|
|
style.font_kerning, style.font_variant_ligatures,
|
|
style.font_variant_position, style.font_variant_caps,
|
|
style.font_variant_numeric, style.font_variant_alternates,
|
|
style.font_variant_east_asian, style.font_feature_settings)
|
|
if features:
|
|
features = ','.join(
|
|
('%s %i' % (key, value)) for key, value in features.items())
|
|
|
|
# TODO: attributes should be freed.
|
|
# In the meantime, keep a cache to avoid leaking too many of them.
|
|
attr = PANGO_ATTR_FONT_FEATURES_CACHE.get(features)
|
|
if attr is None:
|
|
try:
|
|
attr = pango.pango_attr_font_features_new(
|
|
features.encode('ascii'))
|
|
except AttributeError:
|
|
LOGGER.error(
|
|
'OpenType features are not available with Pango < 1.38')
|
|
else:
|
|
PANGO_ATTR_FONT_FEATURES_CACHE[features] = attr
|
|
if attr is not None:
|
|
attr_list = pango.pango_attr_list_new()
|
|
pango.pango_attr_list_insert(attr_list, attr)
|
|
pango.pango_layout_set_attributes(layout.layout, attr_list)
|
|
|
|
# Tabs width
|
|
if style.tab_size != 8: # Default Pango value is 8
|
|
layout.set_tabs(style)
|
|
|
|
return layout
|
|
|
|
|
|
def split_first_line(text, style, context, max_width, justification_spacing,
|
|
minimum=False):
|
|
"""Fit as much as possible in the available width for one line of text.
|
|
|
|
Return ``(layout, length, resume_at, width, height, baseline)``.
|
|
|
|
``layout``: a pango Layout with the first line
|
|
``length``: length in UTF-8 bytes of the first line
|
|
``resume_at``: The number of UTF-8 bytes to skip for the next line.
|
|
May be ``None`` if the whole text fits in one line.
|
|
This may be greater than ``length`` in case of preserved
|
|
newline characters.
|
|
``width``: width in pixels of the first line
|
|
``height``: height in pixels of the first line
|
|
``baseline``: baseline in pixels of the first line
|
|
|
|
"""
|
|
# See https://www.w3.org/TR/css-text-3/#white-space-property
|
|
text_wrap = style.white_space in ('normal', 'pre-wrap', 'pre-line')
|
|
space_collapse = style.white_space in ('normal', 'nowrap', 'pre-line')
|
|
|
|
if not text_wrap:
|
|
max_width = None
|
|
|
|
# Step #1: Get a draft layout with the first line
|
|
layout = None
|
|
if max_width is not None and max_width != float('inf') and style.font_size:
|
|
expected_length = int(max_width / style.font_size * 2.5)
|
|
if expected_length < len(text):
|
|
# Try to use a small amount of text instead of the whole text
|
|
layout = create_layout(
|
|
text[:expected_length], style, context, max_width,
|
|
justification_spacing)
|
|
lines = layout.iter_lines()
|
|
first_line = next(lines, None)
|
|
second_line = next(lines, None)
|
|
if second_line is None:
|
|
# The small amount of text fits in one line, give up and use
|
|
# the whole text
|
|
layout = None
|
|
if layout is None:
|
|
layout = create_layout(
|
|
text, style, context, max_width, justification_spacing)
|
|
lines = layout.iter_lines()
|
|
first_line = next(lines, None)
|
|
second_line = next(lines, None)
|
|
resume_at = None if second_line is None else second_line.start_index
|
|
|
|
# Step #2: Don't split lines when it's not needed
|
|
if max_width is None:
|
|
# The first line can take all the place needed
|
|
return first_line_metrics(
|
|
first_line, text, layout, resume_at, space_collapse, style)
|
|
first_line_width, _ = get_size(first_line, style)
|
|
if second_line is None and first_line_width <= max_width:
|
|
# The first line fits in the available width
|
|
return first_line_metrics(
|
|
first_line, text, layout, resume_at, space_collapse, style)
|
|
|
|
# Step #3: Try to put the first word of the second line on the first line
|
|
# https://mail.gnome.org/archives/gtk-i18n-list/2013-September/msg00006
|
|
# is a good thread related to this problem.
|
|
if first_line_width <= max_width:
|
|
# The first line may have been cut too early by Pango
|
|
second_line_index = second_line.start_index
|
|
first_line_text = utf8_slice(text, slice(second_line_index))
|
|
second_line_text = utf8_slice(text, slice(second_line_index, None))
|
|
else:
|
|
# The first word is longer than the line, try to hyphenize it
|
|
first_line_text = ''
|
|
second_line_text = text
|
|
|
|
next_word = second_line_text.split(' ', 1)[0]
|
|
if next_word:
|
|
if space_collapse:
|
|
# next_word might fit without a space afterwards
|
|
# only try when space collapsing is allowed
|
|
new_first_line_text = first_line_text + next_word
|
|
layout.set_text(new_first_line_text)
|
|
lines = layout.iter_lines()
|
|
first_line = next(lines, None)
|
|
second_line = next(lines, None)
|
|
first_line_width, _ = get_size(first_line, style)
|
|
if second_line is None and first_line_text:
|
|
# The next word fits in the first line, keep the layout
|
|
resume_at = len(new_first_line_text.encode('utf-8')) + 1
|
|
return first_line_metrics(
|
|
first_line, text, layout, resume_at, space_collapse, style)
|
|
elif second_line:
|
|
# Text may have been split elsewhere by Pango earlier
|
|
resume_at = second_line.start_index
|
|
else:
|
|
# Second line is none
|
|
resume_at = first_line.length + 1
|
|
elif first_line_text:
|
|
# We found something on the first line but we did not find a word on
|
|
# the next line, no need to hyphenate, we can keep the current layout
|
|
return first_line_metrics(
|
|
first_line, text, layout, resume_at, space_collapse, style)
|
|
|
|
# Step #4: Try to hyphenize
|
|
hyphens = style.hyphens
|
|
lang = style.lang and pyphen.language_fallback(style.lang)
|
|
total, left, right = style.hyphenate_limit_chars
|
|
hyphenated = False
|
|
soft_hyphen = u'\u00ad'
|
|
|
|
# Automatic hyphenation possible and next word is long enough
|
|
if hyphens != 'none' and len(next_word) >= total:
|
|
first_line_width, _ = get_size(first_line, style)
|
|
space = max_width - first_line_width
|
|
if style.hyphenate_limit_zone.unit == '%':
|
|
limit_zone = max_width * style.hyphenate_limit_zone.value / 100.
|
|
else:
|
|
limit_zone = style.hyphenate_limit_zone.value
|
|
|
|
if space > limit_zone or space < 0:
|
|
# Manual hyphenation: check that the line ends with a soft hyphen
|
|
# and add the missing hyphen
|
|
if hyphens == 'manual':
|
|
if first_line_text.endswith(soft_hyphen):
|
|
# The first line has been split on a soft hyphen
|
|
if u' ' in first_line_text:
|
|
first_line_text, next_word = (
|
|
first_line_text.rsplit(u' ', 1))
|
|
next_word = u' ' + next_word
|
|
layout.set_text(first_line_text)
|
|
lines = layout.iter_lines()
|
|
first_line = next(lines, None)
|
|
second_line = next(lines, None)
|
|
resume_at = len(
|
|
(first_line_text + u' ').encode('utf8'))
|
|
else:
|
|
first_line_text, next_word = u'', first_line_text
|
|
soft_hyphen_indexes = [
|
|
match.start() for match in
|
|
re.finditer(soft_hyphen, next_word)]
|
|
soft_hyphen_indexes.reverse()
|
|
dictionary_iterations = [
|
|
next_word[:i + 1] for i in soft_hyphen_indexes]
|
|
elif hyphens == 'auto' and lang:
|
|
# The next word does not fit, try hyphenation
|
|
dictionary_key = (lang, left, right, total)
|
|
dictionary = PYPHEN_DICTIONARY_CACHE.get(dictionary_key)
|
|
if dictionary is None:
|
|
dictionary = pyphen.Pyphen(
|
|
lang=lang, left=left, right=right)
|
|
PYPHEN_DICTIONARY_CACHE[dictionary_key] = dictionary
|
|
dictionary_iterations = [
|
|
start for start, end in dictionary.iterate(next_word)]
|
|
else:
|
|
dictionary_iterations = []
|
|
|
|
if dictionary_iterations:
|
|
for first_word_part in dictionary_iterations:
|
|
new_first_line_text = first_line_text + first_word_part
|
|
hyphenated_first_line_text = (
|
|
new_first_line_text + style.hyphenate_character)
|
|
new_layout = create_layout(
|
|
hyphenated_first_line_text, style, context, max_width,
|
|
justification_spacing)
|
|
new_lines = new_layout.iter_lines()
|
|
new_first_line = next(new_lines, None)
|
|
new_second_line = next(new_lines, None)
|
|
new_first_line_width, _ = get_size(new_first_line, style)
|
|
new_space = max_width - new_first_line_width
|
|
if new_second_line is None and (
|
|
new_space >= 0 or
|
|
first_word_part == dictionary_iterations[-1]):
|
|
hyphenated = True
|
|
layout = new_layout
|
|
first_line = new_first_line
|
|
second_line = new_second_line
|
|
resume_at = len(new_first_line_text.encode('utf8'))
|
|
if text[len(new_first_line_text)] == soft_hyphen:
|
|
resume_at += len(soft_hyphen.encode('utf8'))
|
|
break
|
|
|
|
if not hyphenated and not first_line_text:
|
|
# Recreate the layout with no max_width to be sure that
|
|
# we don't break inside the hyphenate-character string
|
|
hyphenated = True
|
|
layout.set_text(hyphenated_first_line_text)
|
|
pango.pango_layout_set_width(
|
|
layout.layout, units_from_double(-1))
|
|
lines = layout.iter_lines()
|
|
first_line = next(lines, None)
|
|
second_line = next(lines, None)
|
|
resume_at = len(new_first_line_text.encode('utf8'))
|
|
if text[len(first_line_text)] == soft_hyphen:
|
|
resume_at += len(soft_hyphen.encode('utf8'))
|
|
|
|
if not hyphenated and first_line_text.endswith(soft_hyphen):
|
|
# Recreate the layout with no max_width to be sure that
|
|
# we don't break inside the hyphenate-character string
|
|
hyphenated = True
|
|
hyphenated_first_line_text = (
|
|
first_line_text + style.hyphenate_character)
|
|
layout.set_text(hyphenated_first_line_text)
|
|
pango.pango_layout_set_width(
|
|
layout.layout, units_from_double(-1))
|
|
lines = layout.iter_lines()
|
|
first_line = next(lines, None)
|
|
second_line = next(lines, None)
|
|
resume_at = len(first_line_text.encode('utf8'))
|
|
|
|
# Step 5: Try to break word if it's too long for the line
|
|
overflow_wrap = style.overflow_wrap
|
|
first_line_width, _ = get_size(first_line, style)
|
|
space = max_width - first_line_width
|
|
# If we can break words and the first line is too long
|
|
if not minimum and overflow_wrap == 'break-word' and space < 0:
|
|
# Is it really OK to remove hyphenation for word-break ?
|
|
hyphenated = False
|
|
# TODO: Modify code to preserve W3C condition:
|
|
# "Shaping characters are still shaped as if the word were not broken"
|
|
# The way new lines are processed in this function (one by one with no
|
|
# memory of the last) prevents shaping characters (arabic, for
|
|
# instance) from keeping their shape when wrapped on the next line with
|
|
# pango layout. Maybe insert Unicode shaping characters in text?
|
|
layout.set_text(text)
|
|
pango.pango_layout_set_width(
|
|
layout.layout, units_from_double(max_width))
|
|
layout.set_wrap(PANGO_WRAP_MODE['WRAP_CHAR'])
|
|
temp_lines = layout.iter_lines()
|
|
next(temp_lines, None)
|
|
temp_second_line = next(temp_lines, None)
|
|
temp_second_line_index = (
|
|
len(text.encode('utf-8')) if temp_second_line is None
|
|
else temp_second_line.start_index)
|
|
# TODO: WRAP_CHAR is said to "wrap lines at character boundaries", but
|
|
# it doesn't. Looks like it tries to split at word boundaries and then
|
|
# at character boundaries if there's no enough space for a full word,
|
|
# just as WRAP_WORD_CHAR does. That's why we have to split this text
|
|
# twice. Find why. It may be related to the problem described in the
|
|
# link given in step #3.
|
|
first_line_text = utf8_slice(text, slice(temp_second_line_index))
|
|
layout.set_text(first_line_text)
|
|
lines = layout.iter_lines()
|
|
first_line = next(lines, None)
|
|
second_line = next(lines, None)
|
|
resume_at = (
|
|
first_line.length if second_line is None
|
|
else second_line.start_index)
|
|
|
|
if resume_at is not None and resume_at >= len(text.encode('utf-8')):
|
|
resume_at = None
|
|
return first_line_metrics(
|
|
first_line, text, layout, resume_at, space_collapse, style, hyphenated,
|
|
style.hyphenate_character)
|
|
|
|
|
|
def show_first_line(context, pango_layout, hinting):
|
|
"""Draw the given ``line`` to the Cairo ``context``."""
|
|
context = ffi.cast('cairo_t *', context._pointer)
|
|
if hinting:
|
|
pangocairo.pango_cairo_update_layout(context, pango_layout.layout)
|
|
# Set an infinite width as we don't want to break lines when drawing, the
|
|
# lines have already been split and the size may differ for example because
|
|
# of hinting.
|
|
pango.pango_layout_set_width(pango_layout.layout, -1)
|
|
pangocairo.pango_cairo_show_layout_line(
|
|
context, next(pango_layout.iter_lines()))
|
|
|
|
|
|
def can_break_text(text, lang):
|
|
if not text or len(text) < 2:
|
|
return False
|
|
if lang:
|
|
lang_p, lang = unicode_to_char_p(lang)
|
|
else:
|
|
lang = None
|
|
language = pango.pango_language_get_default()
|
|
if lang:
|
|
language = pango.pango_language_from_string(lang_p)
|
|
# TODO: this should be removed when bidi is supported
|
|
for char in ('\u202a', '\u202b', '\u202c', '\u202d', '\u202e'):
|
|
text = text.replace(char, '')
|
|
text_p, bytestring = unicode_to_char_p(text)
|
|
length = len(bytestring) + 1
|
|
log_attrs = ffi.new('PangoLogAttr[]', length)
|
|
pango.pango_get_log_attrs(
|
|
text_p, len(bytestring), -1, language, log_attrs, length)
|
|
return any(attr.is_line_break for attr in log_attrs[1:length - 1])
|