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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 <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, PangoGlyphString *glyphs)
{
glong fixup;
for (fixup = 0; fixup < mprefixups->fFixupCount; fixup += 1) {
glong baseIndex = mprefixups->fFixupData[fixup].fBaseIndex;
glong mpreIndex = mprefixups->fFixupData[fixup].fMPreIndex;
glong mpreLimit, mpreCount, moveCount, mpreDest;
glong i;
PangoGlyph *mpreSave;
int *clusterSave;
/* determine post GSUB location of baseIndex and mpreIndex */
gboolean no_base = TRUE;
for (i = 0; i<glyphs->num_glyphs; i++) {
if (glyphs->log_clusters[i] == baseIndex) {
baseIndex = i + 1;
no_base = FALSE;
}
if (glyphs->log_clusters[i] == mpreIndex)
mpreIndex = i;
}
if (no_base)
break;
mpreLimit = mpreIndex + 1;
while (glyphs->glyphs[baseIndex].glyph == 0xFFFF || glyphs->glyphs[baseIndex].glyph == 0xFFFE) {
baseIndex -= 1;
}
while (glyphs->glyphs[mpreIndex].glyph == 0xFFFF || glyphs->glyphs[mpreIndex].glyph == 0xFFFE) {
mpreLimit += 1;
}
if (mpreLimit == baseIndex) {
continue;
}
mpreCount = mpreLimit - mpreIndex;
moveCount = baseIndex - mpreLimit;
mpreDest = baseIndex - mpreCount - 1;
mpreSave = g_new (PangoGlyph, mpreCount);
clusterSave = g_new (int, mpreCount);
for (i = 0; i < mpreCount; i += 1) {
mpreSave[i] = glyphs->glyphs[mpreIndex + i].glyph;
clusterSave[i] = glyphs->log_clusters[mpreIndex + i];
}
for (i = 0; i < moveCount; i += 1) {
glyphs->glyphs[mpreIndex + i].glyph = glyphs->glyphs[mpreLimit + i].glyph;
glyphs->log_clusters[mpreIndex + i] = glyphs->log_clusters[mpreLimit + i];
}
for (i = 0; i < mpreCount; i += 1) {
glyphs->glyphs[mpreDest + i].glyph = mpreSave[i];
glyphs->log_clusters[mpreDest + i] = clusterSave[i];
}
g_free(mpreSave);
}
}
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