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/* Pango
* hebrew-fc.h: Hebrew shaper for FreeType-based backends
*
* Copyright (C) 2000 Red Hat Software
* Author: Owen Taylor <otaylor@redhat.com>
*
* 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 <string.h>
#include "pango-engine.h"
#include "pango-utils.h"
#include "pangofc-font.h"
#include "hebrew-shaper.h"
/* No extra fields needed */
typedef PangoEngineShape HebrewEngineFc;
typedef PangoEngineShapeClass HebrewEngineFcClass ;
#define MAX_CLUSTER_CHRS 20
static PangoEngineScriptInfo hebrew_scripts[] = {
{ PANGO_SCRIPT_HEBREW, "*" }
};
#define SCRIPT_ENGINE_NAME "HebrewScriptEngineFc"
#define RENDER_TYPE PANGO_RENDER_TYPE_FC
static PangoEngineInfo script_engines[] = {
{
SCRIPT_ENGINE_NAME,
PANGO_ENGINE_TYPE_SHAPE,
RENDER_TYPE,
hebrew_scripts, G_N_ELEMENTS(hebrew_scripts)
}
};
static void
get_cluster_glyphs(PangoFont *font,
gunichar cluster[],
gint cluster_size,
/* output */
gint glyph_num[],
PangoGlyph glyph[],
gint widths[],
PangoRectangle ink_rects[])
{
int i;
for (i=0; i<cluster_size; i++)
{
PangoRectangle logical_rect;
glyph_num[i] = pango_fc_font_get_glyph ((PangoFcFont *)font, cluster[i]);
glyph[i] = glyph_num[i];
pango_font_get_glyph_extents (font,
glyph[i], &ink_rects[i], &logical_rect);
/* Assign the base char width to the last character in the cluster */
if (i==0)
{
widths[i] = 0;
widths[cluster_size-1] = logical_rect.width;
}
else if (i < cluster_size-1)
widths[i] = 0;
}
}
static void
add_glyph (PangoGlyphString *glyphs,
gint cluster_start,
PangoGlyph glyph,
gboolean is_combining,
gint width,
gint x_offset,
gint y_offset
)
{
gint index = glyphs->num_glyphs;
pango_glyph_string_set_size (glyphs, index + 1);
glyphs->glyphs[index].glyph = glyph;
glyphs->glyphs[index].attr.is_cluster_start = is_combining ? 0 : 1;
glyphs->log_clusters[index] = cluster_start;
glyphs->glyphs[index].geometry.x_offset = x_offset;
glyphs->glyphs[index].geometry.y_offset = y_offset;
glyphs->glyphs[index].geometry.width = width;
}
static void
add_cluster(PangoFont *font,
PangoGlyphString *glyphs,
int cluster_size,
int cluster_start,
int glyph_num[],
PangoGlyph glyph[],
int width[],
int x_offset[],
int y_offset[])
{
int i;
for (i=0; i<cluster_size; i++)
{
add_glyph (glyphs, cluster_start, glyph[i],
i == 0 ? FALSE : TRUE, width[i], x_offset[i], y_offset[i]);
}
}
static void
hebrew_engine_shape (PangoEngineShape *engine,
PangoFont *font,
const char *text,
gint length,
PangoAnalysis *analysis,
PangoGlyphString *glyphs)
{
const char *p;
const char *log_cluster;
gunichar cluster[MAX_CLUSTER_CHRS];
gint cluster_size;
gint glyph_num[MAX_CLUSTER_CHRS];
gint glyph_width[MAX_CLUSTER_CHRS], x_offset[MAX_CLUSTER_CHRS], y_offset[MAX_CLUSTER_CHRS];
PangoRectangle ink_rects[MAX_CLUSTER_CHRS];
PangoGlyph glyph[MAX_CLUSTER_CHRS];
FT_Face face;
g_return_if_fail (font != NULL);
g_return_if_fail (text != NULL);
g_return_if_fail (length >= 0);
g_return_if_fail (analysis != NULL);
pango_glyph_string_set_size (glyphs, 0);
p = text;
while (p < text + length)
{
log_cluster = p;
p = hebrew_shaper_get_next_cluster (p, text + length - p,
/* output */
cluster, &cluster_size);
get_cluster_glyphs(font,
cluster,
cluster_size,
/* output */
glyph_num,
glyph,
glyph_width,
ink_rects);
/* Kern the glyphs! */
hebrew_shaper_get_cluster_kerning(cluster,
cluster_size,
/* Input and output */
ink_rects,
glyph_width,
/* output */
x_offset,
y_offset);
add_cluster(font,
glyphs,
cluster_size,
log_cluster - text,
glyph_num,
glyph,
glyph_width,
x_offset,
y_offset);
}
if (analysis->level % 2)
hebrew_shaper_bidi_reorder(glyphs);
}
static void
hebrew_engine_fc_class_init (PangoEngineShapeClass *class)
{
class->script_shape = hebrew_engine_shape;
}
PANGO_ENGINE_SHAPE_DEFINE_TYPE (HebrewEngineFc, hebrew_engine_fc,
hebrew_engine_fc_class_init, NULL);
void
PANGO_MODULE_ENTRY(init) (GTypeModule *module)
{
hebrew_engine_fc_register_type (module);
}
void
PANGO_MODULE_ENTRY(exit) (void)
{
}
void
PANGO_MODULE_ENTRY(list) (PangoEngineInfo **engines,
int *n_engines)
{
*engines = script_engines;
*n_engines = G_N_ELEMENTS (script_engines);
}
PangoEngine *
PANGO_MODULE_ENTRY(create) (const char *id)
{
if (!strcmp (id, SCRIPT_ENGINE_NAME))
return g_object_new (hebrew_engine_fc_type, NULL);
else
return NULL;
}
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