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Diffstat (limited to 'pango/pango-engine.c')
| -rw-r--r-- | pango/pango-engine.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/pango/pango-engine.c b/pango/pango-engine.c new file mode 100644 index 00000000..034f5eb6 --- /dev/null +++ b/pango/pango-engine.c @@ -0,0 +1,162 @@ +/* Pango + * pango-engine.c: Engines for script and language specific processing + * + * Copyright (C) 2003 Red Hat Software + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include "pango-engine.h" +#include "pango-engine-private.h" +#include "pango-impl-utils.h" + +PANGO_DEFINE_TYPE_ABSTRACT (PangoEngine, pango_engine, + NULL, NULL, + G_TYPE_OBJECT); + +PANGO_DEFINE_TYPE_ABSTRACT (PangoEngineLang, pango_engine_lang, + NULL, NULL, + PANGO_TYPE_ENGINE); + +static PangoCoverage * +pango_engine_shape_real_get_coverage (PangoEngineShape *engine, + PangoFont *font, + PangoLanguage *language) +{ + return pango_font_get_coverage (font, language); +} + +void +pango_engine_shape_class_init (PangoEngineShapeClass *class) +{ + class->get_coverage = pango_engine_shape_real_get_coverage; +} + +PANGO_DEFINE_TYPE_ABSTRACT (PangoEngineShape, pango_engine_shape, + pango_engine_shape_class_init, NULL, + PANGO_TYPE_ENGINE); + +void +_pango_engine_shape_shape (PangoEngineShape *engine, + PangoFont *font, + const char *text, + int length, + PangoAnalysis *analysis, + PangoGlyphString *glyphs) +{ + g_return_if_fail (PANGO_IS_ENGINE_SHAPE (engine)); + g_return_if_fail (PANGO_IS_FONT (font)); + g_return_if_fail (text != NULL); + g_return_if_fail (analysis != NULL); + g_return_if_fail (glyphs != NULL); + + PANGO_ENGINE_SHAPE_GET_CLASS (engine)->script_shape (engine, + font, + text, length, + analysis, + glyphs); +} + +PangoCoverage * +_pango_engine_shape_get_coverage (PangoEngineShape *engine, + PangoFont *font, + PangoLanguage *language) +{ + g_return_val_if_fail (PANGO_IS_ENGINE_SHAPE (engine), NULL); + g_return_val_if_fail (PANGO_IS_FONT (font), NULL); + + return PANGO_ENGINE_SHAPE_GET_CLASS (engine)->get_coverage (engine, + font, + language); +} + +/* No extra fields needed */ +typedef PangoEngineShape PangoFallbackEngine; +typedef PangoEngineShapeClass PangoFallbackEngineClass; + +static void +fallback_engine_shape (PangoEngineShape *engine, + PangoFont *font, + const char *text, + gint length, + PangoAnalysis *analysis, + PangoGlyphString *glyphs) +{ + int n_chars; + int i; + const char *p; + + g_return_if_fail (font != NULL); + g_return_if_fail (text != NULL); + g_return_if_fail (length >= 0); + g_return_if_fail (analysis != NULL); + + n_chars = g_utf8_strlen (text, length); + pango_glyph_string_set_size (glyphs, n_chars); + + p = text; + i = 0; + while (i < n_chars) + { + glyphs->glyphs[i].glyph = 0; + + glyphs->glyphs[i].geometry.x_offset = 0; + glyphs->glyphs[i].geometry.y_offset = 0; + glyphs->glyphs[i].geometry.width = 0; + + glyphs->log_clusters[i] = p - text; + + ++i; + p = g_utf8_next_char (p); + } +} + +static PangoCoverage* +fallback_engine_get_coverage (PangoEngineShape *engine, + PangoFont *font, + PangoLanguage *lang) +{ + PangoCoverage *result = pango_coverage_new (); + + /* We return an empty coverage (this function won't get + * called, but if it is, empty coverage will keep + * it from being used). + */ + + return result; +} + +static void +fallback_engine_class_init (PangoEngineShapeClass *class) +{ + class->get_coverage = fallback_engine_get_coverage; + class->script_shape = fallback_engine_shape; +} + +static PANGO_DEFINE_TYPE (PangoFallbackEngine, pango_fallback_engine, + fallback_engine_class_init, NULL, + PANGO_TYPE_ENGINE_SHAPE); + +PangoEngineShape * +pango_get_fallback_shaper (void) +{ + static PangoEngineShape *fallback_shaper = NULL; + if (!fallback_shaper) + fallback_shaper = g_object_new (pango_fallback_engine_get_type (), NULL); + + return fallback_shaper; +} + |