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/* Pango
* pango-ot-buffer.c: Buffer of glyphs for shaping/positioning
*
* Copyright (C) 2004 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-ot-private.h"
/**
* pango_ot_buffer_new
* @font: a #PangoFcFont
*
* Creates a new #PangoOTBuffer for the given OpenType font.
*
* Return value: the newly allocated #PangoOTBuffer, which should
* be freed with pango_ot_buffer_destroy().
*
* Since: 1.4
**/
PangoOTBuffer *
pango_ot_buffer_new (PangoFcFont *font)
{
PangoOTBuffer *buffer = g_slice_new (PangoOTBuffer);
buffer->buffer = hb_buffer_create ();
hb_buffer_set_unicode_funcs (buffer->buffer, hb_glib_get_unicode_funcs ());
return buffer;
}
/**
* pango_ot_buffer_destroy
* @buffer: a #PangoOTBuffer
*
* Destroys a #PangoOTBuffer and free all associated memory.
*
* Since: 1.4
**/
void
pango_ot_buffer_destroy (PangoOTBuffer *buffer)
{
hb_buffer_destroy (buffer->buffer);
g_slice_free (PangoOTBuffer, buffer);
}
/**
* pango_ot_buffer_clear
* @buffer: a #PangoOTBuffer
*
* Empties a #PangoOTBuffer, make it ready to add glyphs to.
*
* Since: 1.4
**/
void
pango_ot_buffer_clear (PangoOTBuffer *buffer)
{
hb_buffer_reset (buffer->buffer);
}
/**
* pango_ot_buffer_add_glyph
* @buffer: a #PangoOTBuffer
* @glyph: the glyph index to add, like a #PangoGlyph
* @properties: the glyph properties
* @cluster: the cluster that this glyph belongs to
*
* Appends a glyph to a #PangoOTBuffer, with @properties identifying which
* features should be applied on this glyph. See pango_ot_ruleset_add_feature().
*
* Since: 1.4
**/
void
pango_ot_buffer_add_glyph (PangoOTBuffer *buffer,
guint glyph,
guint properties,
guint cluster)
{
hb_buffer_add (buffer->buffer, glyph, cluster);
}
/**
* pango_ot_buffer_set_rtl
* @buffer: a #PangoOTBuffer
* @rtl: %TRUE for right-to-left text
*
* Sets whether glyphs will be rendered right-to-left. This setting
* is needed for proper horizontal positioning of right-to-left scripts.
*
* Since: 1.4
**/
void
pango_ot_buffer_set_rtl (PangoOTBuffer *buffer,
gboolean rtl)
{
hb_buffer_set_direction (buffer->buffer, rtl ? HB_DIRECTION_RTL : HB_DIRECTION_LTR);
}
/**
* pango_ot_buffer_set_zero_width_marks
* @buffer: a #PangoOTBuffer
* @zero_width_marks: %TRUE if characters with a mark class should
* be forced to zero width.
*
* Sets whether characters with a mark class should be forced to zero width.
* This setting is needed for proper positioning of Arabic accents,
* but will produce incorrect results with standard OpenType Indic
* fonts.
*
* Since: 1.6
**/
void
pango_ot_buffer_set_zero_width_marks (PangoOTBuffer *buffer,
gboolean zero_width_marks)
{
}
/**
* pango_ot_buffer_get_glyphs
* @buffer: a #PangoOTBuffer
* @glyphs: (array length=n_glyphs) (out) (optional): location to
* store the array of glyphs, or %NULL
* @n_glyphs: (out) (optional): location to store the number of
* glyphs, or %NULL
*
* Gets the glyph array contained in a #PangoOTBuffer. The glyphs are
* owned by the buffer and should not be freed, and are only valid as long
* as buffer is not modified.
*
* Since: 1.4
**/
void
pango_ot_buffer_get_glyphs (const PangoOTBuffer *buffer,
PangoOTGlyph **glyphs,
int *n_glyphs)
{
if (glyphs)
*glyphs = (PangoOTGlyph *) hb_buffer_get_glyph_infos (buffer->buffer, NULL);
if (n_glyphs)
*n_glyphs = hb_buffer_get_length (buffer->buffer);
}
/**
* pango_ot_buffer_output
* @buffer: a #PangoOTBuffer
* @glyphs: a #PangoGlyphString
*
* Exports the glyphs in a #PangoOTBuffer into a #PangoGlyphString. This is
* typically used after the OpenType layout processing is over, to convert the
* resulting glyphs into a generic Pango glyph string.
*
* Since: 1.4
**/
void
pango_ot_buffer_output (const PangoOTBuffer *buffer,
PangoGlyphString *glyphs)
{
unsigned int i;
int last_cluster;
unsigned int num_glyphs;
hb_buffer_t *hb_buffer = buffer->buffer;
hb_glyph_info_t *hb_glyph;
hb_glyph_position_t *hb_position;
if (HB_DIRECTION_IS_BACKWARD (hb_buffer_get_direction (buffer->buffer)))
hb_buffer_reverse (buffer->buffer);
/* Copy glyphs into output glyph string */
num_glyphs = hb_buffer_get_length (hb_buffer);
hb_glyph = hb_buffer_get_glyph_infos (hb_buffer, NULL);
hb_position = hb_buffer_get_glyph_positions (hb_buffer, NULL);
pango_glyph_string_set_size (glyphs, num_glyphs);
last_cluster = -1;
for (i = 0; i < num_glyphs; i++)
{
glyphs->glyphs[i].glyph = hb_glyph->codepoint;
glyphs->log_clusters[i] = hb_glyph->cluster;
glyphs->glyphs[i].attr.is_cluster_start = glyphs->log_clusters[i] != last_cluster;
last_cluster = glyphs->log_clusters[i];
glyphs->glyphs[i].geometry.width = hb_position->x_advance;
glyphs->glyphs[i].geometry.x_offset = hb_position->x_offset;
glyphs->glyphs[i].geometry.y_offset = hb_position->y_offset;
hb_glyph++;
hb_position++;
}
if (HB_DIRECTION_IS_BACKWARD (hb_buffer_get_direction (buffer->buffer)))
hb_buffer_reverse (buffer->buffer);
}
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