298 lines
9.6 KiB
C++
298 lines
9.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* XPCTL : nsULE.cpp
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code. The Initial Developer of the Original Code is Sun Microsystems, Inc. Portions created by SUN are Copyright (C) 2000 SUN Microsystems, Inc. All Rights Reserved.
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*
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* The Initial Developer of the Original Code is
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* Sun Microsystems, Inc.
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* Portions created by the Initial Developer are Copyright (C) 2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Prabhat Hegde (prabhat.hegde@sun.com)
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* Jungshik Shin (jshin@mailmaps.org)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsULE.h"
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#include "nsString.h"
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#include "pango-types.h"
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#include "pango-glyph.h"
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#include "pango-modules.h"
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#include "pango-utils.h"
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#define GLYPH_COMBINING 256
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/*
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* To Do:(prabhat-04/01/03) Cache GlyphString
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*/
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nsULE::nsULE() {
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}
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nsULE::~nsULE() {
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}
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NS_IMPL_THREADSAFE_ISUPPORTS1(nsULE, nsILE)
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// Default font encoding by code-range
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// At the moment pangoLite only supports 2 shapers/scripts
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const char*
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nsULE::GetDefaultFont(const PRUnichar aString)
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{
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if ((aString >= 0x0e01) && (aString <= 0x0e5b))
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return "tis620-2";
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if ((aString >= 0x0901) && (aString <= 0x0970))
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return "sun.unicode.india-0";
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return "iso8859-1";
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}
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PRInt32
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nsULE::GetGlyphInfo(const PRUnichar *aSrcBuf,
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PRInt32 aSrcLen,
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PangoliteGlyphString *aGlyphData,
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const char *aFontCharset)
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{
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int ct=0, start=0, i, index, startgid, lastCluster=0;
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PRBool sameCtlRun=PR_FALSE;
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PangoliteEngineShape *curShaper=NULL, *prevShaper=NULL;
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PangoliteMap *pngMap=NULL;
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PangoliteAnalysis pngAnalysis;
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guint enginetypeId=0, rendertypeId=0;
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pngAnalysis.aDir = PANGO_DIRECTION_LTR;
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// Maybe find a better way to handle font encodings
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if (aFontCharset == NULL)
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pngAnalysis.fontCharset = strdup(GetDefaultFont(aSrcBuf[0]));
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else
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pngAnalysis.fontCharset = strdup(aFontCharset);
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enginetypeId = g_quark_from_static_string(PANGO_ENGINE_TYPE_SHAPE);
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rendertypeId = g_quark_from_static_string(PANGO_RENDER_TYPE_X);
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pngMap = pangolite_find_map("en_US", enginetypeId, rendertypeId);
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for (ct=0; ct < aSrcLen;) {
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start = ct;
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curShaper = (PangoliteEngineShape*)
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pangolite_map_get_engine(pngMap, (PRUint32)aSrcBuf[ct++]);
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sameCtlRun = (curShaper != NULL);
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prevShaper = curShaper;
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if (sameCtlRun) {
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while (sameCtlRun && ct < aSrcLen) {
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curShaper = (PangoliteEngineShape*)
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pangolite_map_get_engine(pngMap, (PRUint32)aSrcBuf[ct]);
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sameCtlRun = ((curShaper != NULL) && (curShaper == prevShaper));
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if (sameCtlRun)
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ct++;
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}
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startgid = aGlyphData->num_glyphs;
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pngAnalysis.shape_engine = curShaper;
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prevShaper->script_shape(pngAnalysis.fontCharset,
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&aSrcBuf[start], (ct-start),
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&pngAnalysis, aGlyphData);
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if (lastCluster > 0) {
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for (i=startgid; i < aGlyphData->num_glyphs; i++)
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aGlyphData->log_clusters[i] += lastCluster;
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}
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}
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else {
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while (!sameCtlRun && ct < aSrcLen) {
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curShaper = (PangoliteEngineShape*)
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pangolite_map_get_engine(pngMap, (PRUint32)aSrcBuf[ct]);
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sameCtlRun = (curShaper != NULL);
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if (!sameCtlRun)
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ct++;
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}
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index = aGlyphData->num_glyphs;
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for (i=0; i < (ct-start); i++) {
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pangolite_glyph_string_set_size(aGlyphData, index+1);
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aGlyphData->glyphs[index].glyph = aSrcBuf[start+i];
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aGlyphData->glyphs[index].is_cluster_start = (gint)1;
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aGlyphData->log_clusters[index] = i+lastCluster;
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index++;
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}
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}
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lastCluster = aGlyphData->log_clusters[aGlyphData->num_glyphs-1];
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}
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nsMemory::Free(pngAnalysis.fontCharset);
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return aGlyphData->num_glyphs;
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}
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NS_IMETHODIMP
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nsULE::NeedsCTLFix(const PRUnichar *aString,
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const PRInt32 aBeg,
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const PRInt32 aEnd,
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PRBool *aCTLNeeded)
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{
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PangoliteEngineShape *BegShaper=NULL, *EndShaper=NULL;
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PangoliteMap *pngMap=NULL;
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guint enginetypeId=0, rendertypeId=0;
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enginetypeId = g_quark_from_static_string(PANGO_ENGINE_TYPE_SHAPE);
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rendertypeId = g_quark_from_static_string(PANGO_RENDER_TYPE_X);
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pngMap = pangolite_find_map("en_US", enginetypeId, rendertypeId);
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*aCTLNeeded = PR_FALSE;
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if (aBeg >= 0)
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BegShaper = (PangoliteEngineShape*)
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pangolite_map_get_engine(pngMap, (PRUint32)aString[aBeg]);
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if (!BegShaper) {
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if ((aEnd < 0) && ((aBeg+aEnd) >= 0)) {
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EndShaper = (PangoliteEngineShape*)
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pangolite_map_get_engine(pngMap, (PRUint32)aString[aBeg+aEnd]);
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}
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else {
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EndShaper = (PangoliteEngineShape*)
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pangolite_map_get_engine(pngMap, (PRUint32)aString[aEnd]);
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}
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}
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if (BegShaper || EndShaper)
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*aCTLNeeded = PR_TRUE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsULE::GetPresentationForm(const PRUnichar *aString,
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PRUint32 aLength,
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const char *aFontCharset,
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char *aGlyphs,
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PRSize *aOutLength,
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PRBool aIsWide)
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{
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PangoliteGlyphString *tmpGlyphs=pangolite_glyph_string_new();
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GetGlyphInfo(aString, aLength, tmpGlyphs, aFontCharset);
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if (tmpGlyphs->num_glyphs > 0) {
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gint i=0, glyphCt=0;
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for (i=0; i < tmpGlyphs->num_glyphs; i++, glyphCt++) {
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if (aIsWide)
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aGlyphs[glyphCt++]=(unsigned char)
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((tmpGlyphs->glyphs[i].glyph & 0xFF00) >> 8);
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aGlyphs[glyphCt]=(unsigned char)(tmpGlyphs->glyphs[i].glyph & 0x00FF);
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}
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*aOutLength = (PRSize)glyphCt;
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}
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pangolite_glyph_string_free(tmpGlyphs);
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return NS_OK;
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}
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// This routine returns the string index of the next cluster
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// corresponding to the cluster at string index 'aIndex'
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NS_IMETHODIMP
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nsULE::NextCluster(const PRUnichar *aString,
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PRUint32 aLength,
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const PRInt32 aIndex,
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PRInt32 *aNextOffset)
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{
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int mStart, mEnd;
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if (aIndex < 0) {
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*aNextOffset = 0;
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return NS_OK;
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}
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if (PRUint32(aIndex) >= aLength) {
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*aNextOffset = aLength;
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return NS_OK;
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}
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this->GetRangeOfCluster(aString, aLength, aIndex, &mStart, &mEnd);
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*aNextOffset = mEnd;
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return NS_OK;
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}
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// This routine returns the end-offset of the previous block
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// corresponding to string index 'aIndex'
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NS_IMETHODIMP
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nsULE::PrevCluster(const PRUnichar *aString,
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PRUint32 aLength,
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const PRInt32 aIndex,
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PRInt32 *aPrevOffset)
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{
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int gCt, pCluster, cCluster;
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PangoliteGlyphString *GlyphInfo=pangolite_glyph_string_new();
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if (aIndex <= 1) {
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*aPrevOffset = 0;
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return NS_OK;
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}
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pCluster=cCluster=0;
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GetGlyphInfo(aString, aLength, GlyphInfo, NULL);
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for (gCt=0; gCt < GlyphInfo->num_glyphs; gCt++) {
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if (GlyphInfo->glyphs[gCt].is_cluster_start != GLYPH_COMBINING)
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cCluster += GlyphInfo->glyphs[gCt].is_cluster_start;
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if (cCluster >= aIndex) {
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*aPrevOffset = pCluster;
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pangolite_glyph_string_free(GlyphInfo);
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return NS_OK;
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}
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pCluster = cCluster;
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}
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*aPrevOffset = pCluster;
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pangolite_glyph_string_free(GlyphInfo);
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return NS_OK;
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}
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// This routine gets the bounds of a cluster given a index
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NS_IMETHODIMP
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nsULE::GetRangeOfCluster(const PRUnichar *aString,
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PRUint32 aLength,
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const PRInt32 aIndex,
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PRInt32 *aStart,
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PRInt32 *aEnd)
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{
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PangoliteGlyphString *GlyphInfo=pangolite_glyph_string_new();
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int gCt=0;
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GetGlyphInfo(aString, aLength, GlyphInfo, NULL);
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*aStart=*aEnd=0;
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for (gCt=0; gCt < GlyphInfo->num_glyphs; gCt++) {
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if (GlyphInfo->glyphs[gCt].is_cluster_start != GLYPH_COMBINING)
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*aEnd += GlyphInfo->glyphs[gCt].is_cluster_start;
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if (*aEnd >= aIndex+1) {
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pangolite_glyph_string_free(GlyphInfo);
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return NS_OK;
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}
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*aStart = *aEnd;
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}
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*aEnd = aLength;
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pangolite_glyph_string_free(GlyphInfo);
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return NS_OK;
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}
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