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/*
* mprefixups.h: Handle left matra placement
*
* Author: Sivaraj Doddannan
* Ported from IBM's ICU engine. Original copyright:
* (C) Copyright IBM Corp. 1998-2003 - All Rights Reserved
*
* 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/pango-types.h>
#include "mprefixups.h"
#include <stdio.h>
struct _FixupData
{
glong fBaseIndex;
glong fMPreIndex;
};
MPreFixups *indic_mprefixups_new(glong char_count)
{
MPreFixups *mprefixups = g_new (MPreFixups, 1);
mprefixups->fFixupCount = 0;
mprefixups->fFixupData = g_new (FixupData, char_count);
return mprefixups;
}
void indic_mprefixups_free (MPreFixups *mprefixups)
{
g_free (mprefixups->fFixupData);
g_free (mprefixups);
}
void indic_mprefixups_add (MPreFixups *mprefixups, glong baseIndex, glong mpreIndex)
{
/* NOTE: don't add the fixup data if the mpre is right
* before the base consonant glyph.
*/
if (baseIndex - mpreIndex > 1) {
mprefixups->fFixupData[mprefixups->fFixupCount].fBaseIndex = baseIndex;
mprefixups->fFixupData[mprefixups->fFixupCount].fMPreIndex = mpreIndex;
mprefixups->fFixupCount += 1;
}
}
void indic_mprefixups_apply(MPreFixups *mprefixups, PangoOTBuffer *buffer)
{
glong fixup;
for (fixup = 0; fixup < mprefixups->fFixupCount; fixup += 1) {
gulong baseIndex = mprefixups->fFixupData[fixup].fBaseIndex;
gulong mpreIndex = mprefixups->fFixupData[fixup].fMPreIndex;
glong baseGlyph = -1;
glong mpreGlyph = -1;
glong mpreLimit = -1;
glong mpreCount, moveCount, mpreDest;
glong i;
PangoOTGlyph *glyphs;
int n_glyphs;
PangoOTGlyph *mpreSave;
/* determine post GSUB location of baseIndex and mpreIndex */
pango_ot_buffer_get_glyphs (buffer, &glyphs, &n_glyphs);
for (i = 0; i < n_glyphs; i++) {
if (baseGlyph < 0 && glyphs[i].cluster == baseIndex)
baseGlyph = i;
if (glyphs[i].cluster == mpreIndex) {
if (mpreGlyph < 0)
mpreGlyph = i;
mpreLimit = i + 1;
}
}
if (baseGlyph < 0 || mpreGlyph < 0 || mpreLimit >= baseGlyph) {
continue;
}
mpreCount = mpreLimit - mpreGlyph;
moveCount = baseGlyph - mpreLimit;
mpreDest = baseGlyph - mpreCount;
mpreSave = g_new (PangoOTGlyph, mpreCount);
for (i = 0; i < mpreCount; i += 1) {
mpreSave[i] = glyphs[mpreGlyph + i];
}
for (i = 0; i < moveCount; i += 1) {
glyphs[mpreGlyph + i] = glyphs[mpreLimit + i];
}
for (i = 0; i < mpreCount; i += 1) {
glyphs[mpreDest + i] = mpreSave[i];
}
g_free(mpreSave);
}
}
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