} static void basic_engine_shape (PangoEngineShape *engine, PangoFont *font, const char *text, gint length, const PangoAnalysis *analysis, PangoGlyphString *glyphs, const char *paragraph_text G_GNUC_UNUSED, unsigned int paragraph_length G_GNUC_UNUSED) { const char *p; gulong n_chars, gs_i, gs_prev_i; PangoCoreTextFont *cfont = PANGO_CORE_TEXT_FONT (font); PangoCoverage *coverage; GSList *glyph_list; GSList *glyph_iter; /* We first fully iterate over the glyph sequence generated by CoreText and * store this into a list, which is sorted after the iteration. We make a pass * over the sorted linked list to build up the PangoGlyphString. * * We have to do this in order to properly handle a bunch of characteristics of the * glyph sequence generated by the CoreText typesetter: * # E.g. zero-width spaces do not end up in the CoreText glyph sequence. We have * to manually account for the gap in the character indices. * # Sometimes, CoreText generates two glyph for the same character index. We * currently handle this "properly" as in we do not crash or corrupt memory, * but that's about it.
static void basic_engine_shape (PangoEngineShape *engine, PangoFont *font, const char *text, gint length, const PangoAnalysis *analysis, PangoGlyphString *glyphs) { const char *p; char *copy; CTLineRef line; CFStringRef cstr; CFDictionaryRef attributes; CFAttributedStringRef attstr; PangoCoreTextFont *cfont = PANGO_CORE_TEXT_FONT (font); PangoCoverage *coverage; CFArrayRef runs; CTRunRef run; CTRunStatus run_status; CFIndex i, glyph_count; const CGGlyph *cgglyphs; CFTypeRef keys[] = { (CFTypeRef) kCTFontAttributeName }; CFTypeRef values[] = { pango_core_text_font_get_ctfont (cfont) }; attributes = CFDictionaryCreate (kCFAllocatorDefault, (const void **)keys, (const void **)values, 1, &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); copy = g_strndup (text, length + 1); copy[length] = 0; cstr = CFStringCreateWithCString (kCFAllocatorDefault, copy, kCFStringEncodingUTF8); g_free (copy); attstr = CFAttributedStringCreate (kCFAllocatorDefault, cstr, attributes); line = CTLineCreateWithAttributedString (attstr); runs = CTLineGetGlyphRuns (line); /* Since Pango divides things into runs already, we assume there is * only a single run in this line. */ run = CFArrayGetValueAtIndex (runs, 0); run_status = CTRunGetStatus (run); glyph_count = CTRunGetGlyphCount (run); cgglyphs = CTRunGetGlyphsPtr (run); p = text; pango_glyph_string_set_size (glyphs, glyph_count); coverage = pango_font_get_coverage (PANGO_FONT (cfont), analysis->language); for (i = 0; i < glyph_count; i++) { CFIndex real_i, prev_i; gunichar wc; gunichar mirrored_ch; wc = g_utf8_get_char (p); if (analysis->level % 2) if (pango_get_mirror_char (wc, &mirrored_ch)) wc = mirrored_ch; if (run_status & kCTRunStatusRightToLeft) { real_i = glyph_count - i - 1; prev_i = real_i + 1; } else { real_i = i; prev_i = real_i - 1; } if (wc == 0xa0) /* non-break-space */ wc = 0x20; if (pango_is_zero_width (wc)) { set_glyph (font, glyphs, real_i, p - text, PANGO_GLYPH_EMPTY); } else { PangoCoverageLevel result; result = pango_coverage_get (coverage, wc); if (result != PANGO_COVERAGE_NONE) { set_glyph (font, glyphs, real_i, p - text, cgglyphs[real_i]); if (g_unichar_type (wc) == G_UNICODE_NON_SPACING_MARK) { if (i > 0) { PangoRectangle logical_rect, ink_rect; glyphs->glyphs[real_i].geometry.width = MAX (glyphs->glyphs[prev_i].geometry.width, glyphs->glyphs[prev_i].geometry.width); glyphs->glyphs[prev_i].geometry.width = 0; glyphs->log_clusters[real_i] = glyphs->log_clusters[prev_i]; /* Some heuristics to try to guess how overstrike glyphs are * done and compensate */ pango_font_get_glyph_extents (font, glyphs->glyphs[real_i].glyph, &ink_rect, &logical_rect); if (logical_rect.width == 0 && ink_rect.x == 0) glyphs->glyphs[real_i].geometry.x_offset = (glyphs->glyphs[real_i].geometry.width - ink_rect.width) / 2; } } } else { set_glyph (font, glyphs, real_i, p - text, PANGO_GET_UNKNOWN_GLYPH (wc)); } } p = g_utf8_next_char (p); } CFRelease (line); CFRelease (attstr); CFRelease (cstr); CFRelease (attributes); pango_coverage_unref (coverage); }