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Diffstat (limited to 'trunk/pango/pango-engine.c')
| -rw-r--r-- | trunk/pango/pango-engine.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/trunk/pango/pango-engine.c b/trunk/pango/pango-engine.c new file mode 100644 index 00000000..a21e5d84 --- /dev/null +++ b/trunk/pango/pango-engine.c @@ -0,0 +1,174 @@ +/* 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 <config.h> + +#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 PangoCoverageLevel +pango_engine_shape_real_covers (PangoEngineShape *engine, + PangoFont *font, + PangoLanguage *language, + gunichar wc) +{ + + PangoCoverage *coverage = pango_font_get_coverage (font, language); + PangoCoverageLevel result = pango_coverage_get (coverage, wc); + + pango_coverage_unref (coverage); + + return result; +} + +static void +pango_engine_shape_class_init (PangoEngineShapeClass *class) +{ + class->covers = pango_engine_shape_real_covers; +} + +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, + const PangoAnalysis *analysis, + PangoGlyphString *glyphs) +{ + glyphs->num_glyphs = 0; + + PANGO_ENGINE_SHAPE_GET_CLASS (engine)->script_shape (engine, + font, + text, length, + analysis, + glyphs); +} + +PangoCoverageLevel +_pango_engine_shape_covers (PangoEngineShape *engine, + PangoFont *font, + PangoLanguage *language, + gunichar wc) +{ + g_return_val_if_fail (PANGO_IS_ENGINE_SHAPE (engine), PANGO_COVERAGE_NONE); + g_return_val_if_fail (PANGO_IS_FONT (font), PANGO_COVERAGE_NONE); + + return PANGO_ENGINE_SHAPE_GET_CLASS (engine)->covers (engine, + font, + language, + wc); +} + +/* No extra fields needed */ +typedef PangoEngineShape PangoFallbackEngine; +typedef PangoEngineShapeClass PangoFallbackEngineClass; + +static void +fallback_engine_shape (PangoEngineShape *engine, + PangoFont *font, + const char *text, + gint length, + const PangoAnalysis *analysis, + PangoGlyphString *glyphs) +{ + int n_chars; + const char *p; + int cluster = 0; + int i; + + n_chars = text ? g_utf8_strlen (text, length) : 0; + + pango_glyph_string_set_size (glyphs, n_chars); + + p = text; + for (i = 0; i < n_chars; i++) + { + gunichar wc; + PangoGlyph glyph; + PangoRectangle logical_rect; + + 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 + glyph = PANGO_GET_UNKNOWN_GLYPH (wc); + + pango_font_get_glyph_extents (analysis->font, glyph, NULL, &logical_rect); + + glyphs->glyphs[i].glyph = glyph; + + glyphs->glyphs[i].geometry.x_offset = 0; + glyphs->glyphs[i].geometry.y_offset = 0; + glyphs->glyphs[i].geometry.width = logical_rect.width; + + glyphs->log_clusters[i] = cluster; + + p = g_utf8_next_char (p); + } +} + +static PangoCoverageLevel +fallback_engine_covers (PangoEngineShape *engine, + PangoFont *font, + PangoLanguage *lang, + gunichar wc) +{ + return PANGO_COVERAGE_NONE; +} + +static void +fallback_engine_class_init (PangoEngineShapeClass *class) +{ + class->covers = fallback_engine_covers; + 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; +} + |