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/* Pango
* pango-indic.c: Library for Indic script rendering
*
* Copyright (C) 2000 SuSE Linux Ltd.
*
* Author: Robert Brady <rwb197@zepler.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* Licence as published by the Free Software Foundation; either
* version 2 of the Licence, 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 Licence for more details.
*
* You should have received a copy of the GNU Library General Public
* Licence along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "pango-glyph.h"
#include "pango-indic.h"
/**
* pango_indic_shift_vowels:
* @script: A #PangoIndicScript
* @chars: Array of #gunichar
* @end: Pointer to just after the end of @chars
*
* This causes the any vowels in @chars which are
* left-joining vowels to move to the start of @chars.
*
* It determines whether the vowels are left-joining
* by calling is_prefixing_vowel from @script.
*/
void
pango_indic_shift_vowels (PangoIndicScript *script,
gunichar *chars,
gunichar *end)
{
int length = end - chars;
int i, j;
for (i = 1 ; i < length ; i++)
{
if (script->is_prefixing_vowel (chars[i]))
{
gunichar tmp = chars[i];
for (j = i; j > 0; j--) {
chars[j] = chars[j - 1];
}
chars[0] = tmp;
}
}
}
/**
* pango_indic_compact:
* @script: A #PangoIndicScript
* @num: The number of glyphs
* @chars: An array of glyphs/characters
* @cluster: The cluster array.
*
* This eliminates any blank space in the @chars
* array, updated @clusters and @num also.
* (Blank space is defines as U+0000)
*/
void
pango_indic_compact (PangoIndicScript *script,
int *num,
gunichar *chars,
int *cluster)
{
gunichar *dest = chars;
gunichar *end = chars + *num;
int *cluster_dest = cluster;
while (chars < end)
{
if (*chars)
{
*dest = *chars;
*cluster_dest = *cluster;
dest++;
chars++;
cluster++;
cluster_dest++;
}
else
{
chars++;
cluster++;
}
}
*num -= (chars - dest);
}
static gunichar
default_vowel_sign_to_matra (gunichar a)
{
return (a + 0xc000);
}
/**
* pango_indic_convert_vowels:
* @script: A #PangoIndicScript
* @in_middle: Whether vowels should be converted
* @num: The number of elements in @chars.
* @chars: An array of glyphs/characters
* @has_standalone_vowels: Whether the font has standalone vowels.
*
* This converts the second two vowel signs in a row
* in a string, to either a vowel letter or spacing forms
* of the combining vowel.
*/
void
pango_indic_convert_vowels (PangoIndicScript *script,
gboolean in_middle,
int *num,
gunichar *chars,
gboolean has_standalone_vowels)
{
/* goes along and converts vowel signs to vowel letters if needed. */
gunichar *end = chars + *num;
gunichar *start = chars;
gunichar (*vowel_sign_to_matra)(gunichar a) = script->vowel_sign_to_matra;
gboolean last_was_vowel_sign = 0;
vowel_sign_to_matra = FALSE;
if (!vowel_sign_to_matra || has_standalone_vowels)
vowel_sign_to_matra = default_vowel_sign_to_matra;
while (chars < end)
{
gboolean convert = FALSE;
gboolean is_vowel_sign = script->is_vowel_sign (chars[0]);
if (is_vowel_sign)
{
if (chars==start)
convert = TRUE;
if (chars > start && in_middle &&
(last_was_vowel_sign ||
(script->is_vowel_half && script->is_vowel_half (chars[-1]))))
convert = TRUE;
}
if (convert)
chars[0] = vowel_sign_to_matra (chars[0]);
last_was_vowel_sign = is_vowel_sign;
chars++;
}
}
/**
* pango_indic_split_out_characters
* @script: A #PangoIndicScript
* @text: A UTF-8 string
* @n_chars: The number of UTF-8 sequences in @text
* @wc: Pointer to array of #gunichar (output param)
* @n_glyph: Pointer to number of elements in @wc. (output param)
* @glyphs: A #PangoGlyphString.
*
* This splits out the string @text into characters. It will
* split out two-part vowels using @script->vowel_split if
* this function is available.
*
* *@n_chars is allocated with g_new, you must free it.
*/
void
pango_indic_split_out_characters (PangoIndicScript *script,
const char *text,
int n_chars,
gunichar **wc,
int *n_glyph,
PangoGlyphString *glyphs)
{
const char *p = text;
int i;
*n_glyph = n_chars;
if (script->vowel_split)
for (i = 0; i < n_chars; i++)
{
gunichar u = g_utf8_get_char (p);
if (script->vowel_split (u, NULL, NULL))
(*n_glyph)++;
p = g_utf8_next_char (p);
}
p = text;
*wc = (gunichar *) g_new (gunichar, *n_glyph);
pango_glyph_string_set_size (glyphs, *n_glyph);
for (i = 0; i < *n_glyph; i++)
{
(*wc)[i] = g_utf8_get_char (p);
glyphs->log_clusters[i] = p - text;
if (script->vowel_split)
if (script->vowel_split ((*wc)[i], &(*wc)[i], &(*wc)[i+1]))
{
i++;
glyphs->log_clusters[i] = p - text;
}
p = g_utf8_next_char (p);
}
}
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