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/* 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 G_GNUC_UNUSED,
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 G_GNUC_UNUSED,
PangoFont *font G_GNUC_UNUSED,
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 G_GNUC_UNUSED,
PangoFont *font G_GNUC_UNUSED,
PangoLanguage *lang G_GNUC_UNUSED,
gunichar wc G_GNUC_UNUSED)
{
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;
}
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