PangoEngineShapeClass

Class structure for PangoEngineShape script_shape () Given a font, a piece of text, and a PangoAnalysis structure, converts characters to glyphs and positions the resulting glyphs. The results are stored in the PangoGlyphString that is passed in. (The implementation should resize it appropriately using pango_glyph_string_set_size()). All fields of the log_clusters and glyphs array must be filled in, with the exception that Pango will automatically generate glyphs->glyphsi.attr.is_cluster_start using the log_clusters array. Each input character must occur in one of the output logical clusters; if no rendering is desired for a character, this may involve inserting glyphs with the PangoGlyph ID PANGO_GLYPH_EMPTY, which is guaranteed never to render. If the shaping fails for any reason, the shaper should return with an empty (zero-size) glyph string. If the shaper has not set the size on the glyph string yet, simply returning signals the failure too. covers () Returns the characters that this engine can cover with a given font for a given language. If not overridden, the default implementation simply returns the coverage information for the font itself unmodified.