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/* Pango
* pangofc-shape.c: Basic shaper for FreeType-based backends
*
* Copyright (C) 2000, 2007, 2009 Red Hat Software
* Authors:
* Owen Taylor <otaylor@redhat.com>
* Behdad Esfahbod <behdad@behdad.org>
*
* 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 <string.h>
#include <math.h>
#include "pangofc-private.h"
#include "pango-impl-utils.h"
#include <hb-glib.h>
/* cache a single hb_buffer_t */
static hb_buffer_t *cached_buffer = NULL; /* MT-safe */
G_LOCK_DEFINE_STATIC (cached_buffer);
static hb_buffer_t *
acquire_buffer (gboolean *free_buffer)
{
hb_buffer_t *buffer;
if (G_LIKELY (G_TRYLOCK (cached_buffer)))
{
if (G_UNLIKELY (!cached_buffer))
cached_buffer = hb_buffer_create ();
buffer = cached_buffer;
*free_buffer = FALSE;
}
else
{
buffer = hb_buffer_create ();
*free_buffer = TRUE;
}
return buffer;
}
static void
release_buffer (hb_buffer_t *buffer, gboolean free_buffer)
{
if (G_LIKELY (!free_buffer))
{
hb_buffer_reset (buffer);
G_UNLOCK (cached_buffer);
}
else
hb_buffer_destroy (buffer);
}
static void
apply_extra_attributes (GSList *attrs,
hb_feature_t *features,
guint length,
guint *num_features)
{
GSList *l;
for (l = attrs; l && *num_features < length; l = l->next)
{
PangoAttribute *attr = l->data;
if (attr->klass->type == PANGO_ATTR_FONT_FEATURES)
{
PangoAttrFontFeatures *fattr = (PangoAttrFontFeatures *) attr;
const gchar *feat;
const gchar *end;
int len;
feat = fattr->features;
while (feat != NULL && *num_features < length)
{
end = strchr (feat, ',');
if (end)
len = end - feat;
else
len = -1;
if (hb_feature_from_string (feat, len, &features[*num_features]))
{
features[*num_features].start = attr->start_index;
features[*num_features].end = attr->end_index;
(*num_features)++;
}
if (end == NULL)
break;
feat = end + 1;
}
}
}
}
void
_pango_fc_shape (PangoFont *font,
const char *item_text,
unsigned int item_length,
const PangoAnalysis *analysis,
PangoGlyphString *glyphs,
const char *paragraph_text,
unsigned int paragraph_length)
{
hb_font_t *hb_font;
hb_buffer_t *hb_buffer;
hb_direction_t hb_direction;
gboolean free_buffer;
hb_glyph_info_t *hb_glyph;
hb_glyph_position_t *hb_position;
int last_cluster;
guint i, num_glyphs;
unsigned int item_offset = item_text - paragraph_text;
hb_feature_t features[32];
unsigned int num_features = 0;
PangoGlyphInfo *infos;
g_return_if_fail (font != NULL);
g_return_if_fail (analysis != NULL);
hb_font = pango_font_get_hb_font (font);
hb_buffer = acquire_buffer (&free_buffer);
hb_direction = PANGO_GRAVITY_IS_VERTICAL (analysis->gravity) ? HB_DIRECTION_TTB : HB_DIRECTION_LTR;
if (analysis->level % 2)
hb_direction = HB_DIRECTION_REVERSE (hb_direction);
if (PANGO_GRAVITY_IS_IMPROPER (analysis->gravity))
hb_direction = HB_DIRECTION_REVERSE (hb_direction);
/* setup buffer */
hb_buffer_set_direction (hb_buffer, hb_direction);
hb_buffer_set_script (hb_buffer, hb_glib_script_to_script (analysis->script));
hb_buffer_set_language (hb_buffer, hb_language_from_string (pango_language_to_string (analysis->language), -1));
#if HB_VERSION_ATLEAST(1,0,3)
hb_buffer_set_cluster_level (hb_buffer, HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
#endif
hb_buffer_set_flags (hb_buffer, HB_BUFFER_FLAG_BOT | HB_BUFFER_FLAG_EOT);
hb_buffer_add_utf8 (hb_buffer, paragraph_text, paragraph_length, item_offset, item_length);
pango_font_get_features (font, features, G_N_ELEMENTS (features), &num_features);
apply_extra_attributes (analysis->extra_attrs, features, G_N_ELEMENTS (features), &num_features);
hb_shape (hb_font, hb_buffer, features, num_features);
if (PANGO_GRAVITY_IS_IMPROPER (analysis->gravity))
hb_buffer_reverse (hb_buffer);
/* buffer output */
num_glyphs = hb_buffer_get_length (hb_buffer);
hb_glyph = hb_buffer_get_glyph_infos (hb_buffer, NULL);
pango_glyph_string_set_size (glyphs, num_glyphs);
infos = glyphs->glyphs;
last_cluster = -1;
for (i = 0; i < num_glyphs; i++)
{
infos[i].glyph = hb_glyph->codepoint;
glyphs->log_clusters[i] = hb_glyph->cluster - item_offset;
infos[i].attr.is_cluster_start = glyphs->log_clusters[i] != last_cluster;
hb_glyph++;
last_cluster = glyphs->log_clusters[i];
}
hb_position = hb_buffer_get_glyph_positions (hb_buffer, NULL);
if (PANGO_GRAVITY_IS_VERTICAL (analysis->gravity))
for (i = 0; i < num_glyphs; i++)
{
/* 90 degrees rotation counter-clockwise. */
infos[i].geometry.width = hb_position->y_advance;
infos[i].geometry.x_offset = hb_position->y_offset;
infos[i].geometry.y_offset = -hb_position->x_offset;
hb_position++;
}
else /* horizontal */
for (i = 0; i < num_glyphs; i++)
{
infos[i].geometry.width = hb_position->x_advance;
infos[i].geometry.x_offset = hb_position->x_offset;
infos[i].geometry.y_offset = hb_position->y_offset;
hb_position++;
}
release_buffer (hb_buffer, free_buffer);
}
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