C++ (Cpp) pango_ot_ruleset_get_for_description示例

示例#1

文件： syriac-fc.c 项目： soubok/libset

static void
syriac_engine_shape (PangoEngineShape *engine,
		     PangoFont        *font,
		     const char       *text,
		     gint              length,
		     const PangoAnalysis *analysis,
		     PangoGlyphString *glyphs)
{
  PangoFcFont *fc_font;
  FT_Face face;
  PangoOTRulesetDescription desc;
  const PangoOTRuleset *ruleset;
  PangoOTBuffer *buffer;
  gulong *properties = NULL;
  glong n_chars;
  gunichar *wcs;
  const char *p;
  int cluster = 0;
  int i;

  g_return_if_fail (font != NULL);
  g_return_if_fail (text != NULL);
  g_return_if_fail (length >= 0);
  g_return_if_fail (analysis != NULL);

  fc_font = PANGO_FC_FONT (font);
  face = pango_fc_font_lock_face (fc_font);
  if (!face)
    return;

  buffer = pango_ot_buffer_new (fc_font);
  pango_ot_buffer_set_rtl (buffer, analysis->level % 2 != 0);
  pango_ot_buffer_set_zero_width_marks (buffer, TRUE);

  wcs = g_utf8_to_ucs4_fast (text, length, &n_chars);
  properties = g_new0 (gulong, n_chars);

  syriac_assign_properties (wcs, properties, n_chars);

  g_free (wcs);

  p = text;
  for (i=0; i < n_chars; i++)
    {
      gunichar wc;
      PangoGlyph glyph;

      wc = g_utf8_get_char (p);

      if (g_unichar_type (wc) != G_UNICODE_NON_SPACING_MARK)
	cluster = p - text;

      if (pango_is_zero_width (wc))
        glyph = PANGO_GLYPH_EMPTY;
      else
        {
	  gunichar c = wc;

	  if (analysis->level % 2)
	    g_unichar_get_mirror_char (c, &c);

	  glyph = pango_fc_font_get_glyph (fc_font, c);
	}

      if (!glyph)
	glyph = PANGO_GET_UNKNOWN_GLYPH (wc);

      pango_ot_buffer_add_glyph (buffer, glyph, properties[i], cluster);

      p = g_utf8_next_char (p);
    }

  g_free (properties);

  desc.script = analysis->script;
  desc.language = analysis->language;

  desc.n_static_gsub_features = G_N_ELEMENTS (gsub_features);
  desc.static_gsub_features = gsub_features;
  desc.n_static_gpos_features = G_N_ELEMENTS (gpos_features);
  desc.static_gpos_features = gpos_features;

  /* TODO populate other_features from analysis->extra_attrs */
  desc.n_other_features = 0;
  desc.other_features = NULL;

  ruleset = pango_ot_ruleset_get_for_description (pango_ot_info_get (face), &desc);

  pango_ot_ruleset_substitute (ruleset, buffer);
  pango_ot_ruleset_position (ruleset, buffer);
  pango_ot_buffer_output (buffer, glyphs);

  pango_ot_buffer_destroy (buffer);

  pango_fc_font_unlock_face (fc_font);
}

示例#2

文件： indic-fc.c 项目： alexp-sssup/pango

/* analysis->shape_engine has the PangoEngine... */
static void
indic_engine_shape (PangoEngineShape *engine,
		    PangoFont        *font,
		    const char       *text,
		    gint              length,
		    const PangoAnalysis *analysis,
		    PangoGlyphString *glyphs)
{
  PangoFcFont *fc_font;
  FT_Face face;
  PangoOTRulesetDescription desc;
  const PangoOTRuleset *ruleset;
  PangoOTBuffer *buffer;
  glong i, n_chars, n_glyphs;
  gulong *tags = NULL;
  gunichar *wc_in = NULL, *wc_out = NULL;
  glong *utf8_offsets = NULL;
  glong *indices = NULL;
  IndicEngineFc *indic_shape_engine = NULL;
  MPreFixups *mprefixups;

  g_return_if_fail (font != NULL);
  g_return_if_fail (text != NULL);
  g_return_if_fail (length >= 0);
  g_return_if_fail (analysis != NULL);

  fc_font = PANGO_FC_FONT (font);
  face = pango_fc_font_lock_face (fc_font);
  if (!face)
    return;

  indic_shape_engine = (IndicEngineFc *) engine;

  wc_in    = expand_text (text, length, &utf8_offsets, &n_chars);

  n_glyphs = indic_ot_reorder (wc_in, utf8_offsets, n_chars, indic_shape_engine->classTable, NULL, NULL, NULL, NULL);

  wc_out  = g_new (gunichar, n_glyphs);
  indices = g_new (glong,    n_glyphs);
  tags    = g_new (gulong,   n_glyphs);

  n_glyphs  = indic_ot_reorder (wc_in, utf8_offsets, n_chars, indic_shape_engine->classTable, wc_out, indices, tags, &mprefixups);

  pango_glyph_string_set_size (glyphs, n_glyphs);
  buffer = pango_ot_buffer_new (fc_font);
  pango_ot_buffer_set_rtl (buffer, analysis->level % 2 != 0);

  set_glyphs(font, wc_out, tags, n_glyphs, buffer,
	     (indic_shape_engine->classTable->scriptFlags & SF_PROCESS_ZWJ) != 0);

  desc.script = analysis->script;
  desc.language = analysis->language;

  desc.n_static_gsub_features = G_N_ELEMENTS (gsub_features);
  desc.static_gsub_features = gsub_features;
  desc.n_static_gpos_features = G_N_ELEMENTS (gpos_features);
  desc.static_gpos_features = gpos_features;

  /* TODO populate other_features from analysis->extra_attrs */
  desc.n_other_features = 0;
  desc.other_features = NULL;

  ruleset = pango_ot_ruleset_get_for_description (pango_ot_info_get (face), &desc);

  /* do gsub processing */
  pango_ot_ruleset_substitute (ruleset, buffer);

  /* Fix pre-modifiers for some scripts before base consonant */
  if (mprefixups)
    {
      indic_mprefixups_apply (mprefixups, buffer);
      indic_mprefixups_free (mprefixups);
    }

  /* do gpos processing */
  pango_ot_ruleset_position (ruleset, buffer);

  pango_ot_buffer_output (buffer, glyphs);

  /* Get the right log_clusters values */
  for (i = 0; i < glyphs->num_glyphs; i += 1)
    glyphs->log_clusters[i] = indices[glyphs->log_clusters[i]];

  pango_fc_font_unlock_face (fc_font);

  pango_ot_buffer_destroy (buffer);
  g_free (tags);
  g_free (indices);
  g_free (wc_out);
  g_free (wc_in);
  g_free (utf8_offsets);
}