src/java.desktop/unix/native/libawt_xawt/awt/multi_font.c - platform/libcore - Git at Google

 /*
  * Copyright (c) 1996, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code 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 General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 /*
  * These routines are used for display string with multi font.
  */

 #ifdef HEADLESS
     #error This file should not be included in headless library
 #endif

 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
 #include <ctype.h>
 #include <jni.h>
 #include <jni_util.h>
 #include <jvm.h>
 #include "awt_Font.h"
 #include "awt_p.h"
 #include "multi_font.h"

 extern XFontStruct *loadFont(Display *, char *, int32_t);

 extern struct FontIDs fontIDs;
 extern struct PlatformFontIDs platformFontIDs;
 extern struct XFontPeerIDs xFontPeerIDs;

 /*
  * make string with str + string representation of num
  * This string is used as tag string of Motif Compound String and FontList.
  */
 static void
 makeTag(char *str, int32_t num, char *buf)
 {
     int32_t len = strlen(str);

     strcpy(buf, str);
     buf[len] = '0' + num % 100;
     buf[len + 1] = '\0';
 }

 static int32_t
 awtJNI_GetFontDescriptorNumber(JNIEnv * env
                                ,jobject font
                                ,jobject fd)
 {
     int32_t i = 0, num;
     /* initialize to NULL so that DeleteLocalRef will work. */
     jobjectArray componentFonts = NULL;
     jobject peer = NULL;
     jobject temp = NULL;
     jboolean validRet = JNI_FALSE;

     if ((*env)->EnsureLocalCapacity(env, 2) < 0 || (*env)->ExceptionCheck(env))
         goto done;

     peer = (*env)->CallObjectMethod(env,font,fontIDs.getPeer);
     if (peer == NULL)
         goto done;

     componentFonts = (jobjectArray)
         (*env)->GetObjectField(env,peer,platformFontIDs.componentFonts);

     if (componentFonts == NULL)
         goto done;

     num = (*env)->GetArrayLength(env, componentFonts);

     for (i = 0; i < num; i++) {
         temp = (*env)->GetObjectArrayElement(env, componentFonts, i);

         if ((*env)->IsSameObject(env, fd, temp)) {
             validRet = JNI_TRUE;
             break;
         }
         (*env)->DeleteLocalRef(env, temp);
     }

  done:
     (*env)->DeleteLocalRef(env, peer);
     (*env)->DeleteLocalRef(env, componentFonts);

     if (validRet)
         return i;

     return 0;
 }

 jobject
 awtJNI_GetFMFont(JNIEnv * env, jobject this)
 {
     return JNU_CallMethodByName(env, NULL, this, "getFont_NoClientCode",
                                 "()Ljava/awt/Font;").l;
 }

 jboolean
 awtJNI_IsMultiFont(JNIEnv * env, jobject this)
 {
     jobject peer = NULL;
     jobject fontConfig = NULL;

     if (this == NULL) {
         return JNI_FALSE;
     }

     if ((*env)->EnsureLocalCapacity(env, 2) < 0) {
         return JNI_FALSE;
     }

     peer = (*env)->CallObjectMethod(env,this,fontIDs.getPeer);
     if (peer == NULL) {
         return JNI_FALSE;
     }

     fontConfig = (*env)->GetObjectField(env,peer,platformFontIDs.fontConfig);
     (*env)->DeleteLocalRef(env, peer);

     if (fontConfig == NULL) {
         return JNI_FALSE;
     }
     (*env)->DeleteLocalRef(env, fontConfig);

     return JNI_TRUE;
 }

 jboolean
 awtJNI_IsMultiFontMetrics(JNIEnv * env, jobject this)
 {
     jobject peer = NULL;
     jobject fontConfig = NULL;
     jobject font = NULL;

     if (JNU_IsNull(env, this)) {
         return JNI_FALSE;
     }
     if ((*env)->EnsureLocalCapacity(env, 3) < 0) {
         return JNI_FALSE;
     }

     font = JNU_CallMethodByName(env, NULL, this, "getFont_NoClientCode",
                                 "()Ljava/awt/Font;").l;
     if (JNU_IsNull(env, font) || (*env)->ExceptionCheck(env)) {
         return JNI_FALSE;
     }

     peer = (*env)->CallObjectMethod(env,font,fontIDs.getPeer);
     (*env)->DeleteLocalRef(env, font);

     if (peer == NULL) {
         return JNI_FALSE;
     }

     fontConfig = (*env)->GetObjectField(env,peer,platformFontIDs.fontConfig);
     (*env)->DeleteLocalRef(env, peer);
     if (fontConfig == NULL) {
         return JNI_FALSE;
     }
     (*env)->DeleteLocalRef(env, fontConfig);

     return JNI_TRUE;
 }

 /* #define FONT_DEBUG 2 */

 XFontSet
 awtJNI_MakeFontSet(JNIEnv * env, jobject font)
 {
     jstring xlfd = NULL;
     char *xfontset = NULL;
     int32_t size;
     int32_t length = 0;
     char *realxlfd = NULL, *ptr = NULL, *prev = NULL;
     char **missing_list = NULL;
     int32_t missing_count;
     char *def_string = NULL;
     XFontSet xfs;
     jobject peer = NULL;
     jstring xfsname = NULL;
 #ifdef FONT_DEBUG
     char xx[1024];
 #endif

     if ((*env)->EnsureLocalCapacity(env, 2) < 0)
         return 0;

     size = (*env)->GetIntField(env, font, fontIDs.size) * 10;

     peer = (*env)->CallObjectMethod(env,font,fontIDs.getPeer);
     xfsname = (*env)->GetObjectField(env, peer, xFontPeerIDs.xfsname);

     if (JNU_IsNull(env, xfsname))
         xfontset = "";
     else
         xfontset = (char *)JNU_GetStringPlatformChars(env, xfsname, NULL);

     realxlfd = malloc(strlen(xfontset) + 50);

     prev = ptr = xfontset;
     while ((ptr = strstr(ptr, "%d"))) {
         char save = *(ptr + 2);

         *(ptr + 2) = '\0';
         jio_snprintf(realxlfd + length, strlen(xfontset) + 50 - length,
                      prev, size);
         length = strlen(realxlfd);
         *(ptr + 2) = save;

         prev = ptr + 2;
         ptr += 2;
     }
     strcpy(realxlfd + length, prev);

 #ifdef FONT_DEBUG
     strcpy(xx, realxlfd);
 #endif
     xfs = XCreateFontSet(awt_display, realxlfd, &missing_list,
                          &missing_count, &def_string);
 #if FONT_DEBUG >= 2
     fprintf(stderr, "XCreateFontSet(%s)->0x%x\n", xx, xfs);
 #endif

 #if FONT_DEBUG
     if (missing_count != 0) {
         int32_t i;
         fprintf(stderr, "XCreateFontSet missing %d fonts:\n", missing_count);
         for (i = 0; i < missing_count; ++i) {
             fprintf(stderr, "\t\"%s\"\n", missing_list[i]);
         }
         fprintf(stderr, "  requested \"%s\"\n", xx);
 #if FONT_DEBUG >= 3
         exit(-1);
 #endif
     }
 #endif

     free((void *)realxlfd);

     if (xfontset && !JNU_IsNull(env, xfsname))
         JNU_ReleaseStringPlatformChars(env, xfsname, (const char *) xfontset);

     (*env)->DeleteLocalRef(env, peer);
     (*env)->DeleteLocalRef(env, xfsname);
     return xfs;
 }

 /*
  * get multi font string width with multiple X11 font
  *
  * ASSUMES: We are not running on a privileged thread
  */
 int32_t
 awtJNI_GetMFStringWidth(JNIEnv * env, jcharArray s, int offset, int sLength, jobject font)
 {
     char *err = NULL;
     unsigned char *stringData = NULL;
     char *offsetStringData = NULL;
     int32_t stringCount, i;
     int32_t size;
     struct FontData *fdata = NULL;
     jobject fontDescriptor = NULL;
     jbyteArray data = NULL;
     int32_t j;
     int32_t width = 0;
     int32_t length;
     XFontStruct *xf = NULL;
     jobjectArray dataArray = NULL;
     if ((*env)->EnsureLocalCapacity(env, 3) < 0)
         return 0;

     if (!JNU_IsNull(env, s) && !JNU_IsNull(env, font))
     {
         jobject peer;
         peer = (*env)->CallObjectMethod(env,font,fontIDs.getPeer);

         dataArray = (*env)->CallObjectMethod(
                                  env,
                                  peer,
                                  platformFontIDs.makeConvertedMultiFontChars,
                                  s, offset, sLength);

         if ((*env)->ExceptionOccurred(env))
         {
             (*env)->ExceptionDescribe(env);
             (*env)->ExceptionClear(env);
         }

         (*env)->DeleteLocalRef(env, peer);

         if(dataArray == NULL)
         {
             return 0;
         }
     } else {
         return 0;
     }

     fdata = awtJNI_GetFontData(env, font, &err);
     if ((*env)->ExceptionCheck(env)) {
         (*env)->DeleteLocalRef(env, dataArray);
         return 0;
     }

     stringCount = (*env)->GetArrayLength(env, dataArray);

     size = (*env)->GetIntField(env, font, fontIDs.size);

     for (i = 0; i < stringCount; i+=2)
     {
         fontDescriptor = (*env)->GetObjectArrayElement(env, dataArray, i);
         data = (*env)->GetObjectArrayElement(env, dataArray, i + 1);

         /* Bail if we've finished */
         if (fontDescriptor == NULL || data == NULL) {
             (*env)->DeleteLocalRef(env, fontDescriptor);
             (*env)->DeleteLocalRef(env, data);
             break;
         }

         j = awtJNI_GetFontDescriptorNumber(env, font, fontDescriptor);
         if ((*env)->ExceptionCheck(env)) {
             (*env)->DeleteLocalRef(env, fontDescriptor);
             (*env)->DeleteLocalRef(env, data);
             break;
         }

         if (fdata->flist[j].load == 0) {
             xf = loadFont(awt_display,
                           fdata->flist[j].xlfd, size * 10);
             if (xf == NULL) {
                 (*env)->DeleteLocalRef(env, fontDescriptor);
                 (*env)->DeleteLocalRef(env, data);
                 continue;
             }
             fdata->flist[j].load = 1;
             fdata->flist[j].xfont = xf;
             if (xf->min_byte1 == 0 && xf->max_byte1 == 0)
                 fdata->flist[j].index_length = 1;
             else
                 fdata->flist[j].index_length = 2;
         }
         xf = fdata->flist[j].xfont;

         stringData =
             (unsigned char *)(*env)->GetPrimitiveArrayCritical(env, data,NULL);
         if (stringData == NULL) {
             (*env)->DeleteLocalRef(env, fontDescriptor);
             (*env)->DeleteLocalRef(env, data);
             (*env)->ExceptionClear(env);
             JNU_ThrowOutOfMemoryError(env, "Could not get string data");
             break;
         }

         length = (stringData[0] << 24) | (stringData[1] << 16) |
             (stringData[2] << 8) | stringData[3];
         offsetStringData = (char *)(stringData + (4 * sizeof(char)));

         if (fdata->flist[j].index_length == 2) {
             width += XTextWidth16(xf, (XChar2b *)offsetStringData, length/2);
         } else {
             width += XTextWidth(xf, offsetStringData, length);
         }

         (*env)->ReleasePrimitiveArrayCritical(env, data, stringData, JNI_ABORT);
         (*env)->DeleteLocalRef(env, fontDescriptor);
         (*env)->DeleteLocalRef(env, data);
     }
     (*env)->DeleteLocalRef(env, dataArray);

     return width;
 }
	/*
	* Copyright (c) 1996, 2014, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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 General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* These routines are used for display string with multi font.
	*/

	#ifdef HEADLESS
	#error This file should not be included in headless library
	#endif

	#include <stdlib.h>
	#include <string.h>
	#include <math.h>
	#include <ctype.h>
	#include <jni.h>
	#include <jni_util.h>
	#include <jvm.h>
	#include "awt_Font.h"
	#include "awt_p.h"
	#include "multi_font.h"

	extern XFontStruct loadFont(Display , char *, int32_t);

	extern struct FontIDs fontIDs;
	extern struct PlatformFontIDs platformFontIDs;
	extern struct XFontPeerIDs xFontPeerIDs;

	/*
	* make string with str + string representation of num
	* This string is used as tag string of Motif Compound String and FontList.
	*/
	static void
	makeTag(char str, int32_t num, char buf)
	{
	int32_t len = strlen(str);

	strcpy(buf, str);
	buf[len] = '0' + num % 100;
	buf[len + 1] = '\0';
	}

	static int32_t
	awtJNI_GetFontDescriptorNumber(JNIEnv * env
	,jobject font
	,jobject fd)
	{
	int32_t i = 0, num;
	/* initialize to NULL so that DeleteLocalRef will work. */
	jobjectArray componentFonts = NULL;
	jobject peer = NULL;
	jobject temp = NULL;
	jboolean validRet = JNI_FALSE;

	if ((env)->EnsureLocalCapacity(env, 2) < 0 \|\| (env)->ExceptionCheck(env))
	goto done;

	peer = (*env)->CallObjectMethod(env,font,fontIDs.getPeer);
	if (peer == NULL)
	goto done;

	componentFonts = (jobjectArray)
	(*env)->GetObjectField(env,peer,platformFontIDs.componentFonts);

	if (componentFonts == NULL)
	goto done;

	num = (*env)->GetArrayLength(env, componentFonts);

	for (i = 0; i < num; i++) {
	temp = (*env)->GetObjectArrayElement(env, componentFonts, i);

	if ((*env)->IsSameObject(env, fd, temp)) {
	validRet = JNI_TRUE;
	break;
	}
	(*env)->DeleteLocalRef(env, temp);
	}

	done:
	(*env)->DeleteLocalRef(env, peer);
	(*env)->DeleteLocalRef(env, componentFonts);

	if (validRet)
	return i;

	return 0;
	}

	jobject
	awtJNI_GetFMFont(JNIEnv * env, jobject this)
	{
	return JNU_CallMethodByName(env, NULL, this, "getFont_NoClientCode",
	"()Ljava/awt/Font;").l;
	}

	jboolean
	awtJNI_IsMultiFont(JNIEnv * env, jobject this)
	{
	jobject peer = NULL;
	jobject fontConfig = NULL;

	if (this == NULL) {
	return JNI_FALSE;
	}

	if ((*env)->EnsureLocalCapacity(env, 2) < 0) {
	return JNI_FALSE;
	}

	peer = (*env)->CallObjectMethod(env,this,fontIDs.getPeer);
	if (peer == NULL) {
	return JNI_FALSE;
	}

	fontConfig = (*env)->GetObjectField(env,peer,platformFontIDs.fontConfig);
	(*env)->DeleteLocalRef(env, peer);

	if (fontConfig == NULL) {
	return JNI_FALSE;
	}
	(*env)->DeleteLocalRef(env, fontConfig);

	return JNI_TRUE;
	}

	jboolean
	awtJNI_IsMultiFontMetrics(JNIEnv * env, jobject this)
	{
	jobject peer = NULL;
	jobject fontConfig = NULL;
	jobject font = NULL;

	if (JNU_IsNull(env, this)) {
	return JNI_FALSE;
	}
	if ((*env)->EnsureLocalCapacity(env, 3) < 0) {
	return JNI_FALSE;
	}

	font = JNU_CallMethodByName(env, NULL, this, "getFont_NoClientCode",
	"()Ljava/awt/Font;").l;
	if (JNU_IsNull(env, font) \|\| (*env)->ExceptionCheck(env)) {
	return JNI_FALSE;
	}

	peer = (*env)->CallObjectMethod(env,font,fontIDs.getPeer);
	(*env)->DeleteLocalRef(env, font);

	if (peer == NULL) {
	return JNI_FALSE;
	}

	fontConfig = (*env)->GetObjectField(env,peer,platformFontIDs.fontConfig);
	(*env)->DeleteLocalRef(env, peer);
	if (fontConfig == NULL) {
	return JNI_FALSE;
	}
	(*env)->DeleteLocalRef(env, fontConfig);

	return JNI_TRUE;
	}

	/* #define FONT_DEBUG 2 */

	XFontSet
	awtJNI_MakeFontSet(JNIEnv * env, jobject font)
	{
	jstring xlfd = NULL;
	char *xfontset = NULL;
	int32_t size;
	int32_t length = 0;
	char realxlfd = NULL, ptr = NULL, *prev = NULL;
	char **missing_list = NULL;
	int32_t missing_count;
	char *def_string = NULL;
	XFontSet xfs;
	jobject peer = NULL;
	jstring xfsname = NULL;
	#ifdef FONT_DEBUG
	char xx[1024];
	#endif

	if ((*env)->EnsureLocalCapacity(env, 2) < 0)
	return 0;

	size = (env)->GetIntField(env, font, fontIDs.size) 10;

	peer = (*env)->CallObjectMethod(env,font,fontIDs.getPeer);
	xfsname = (*env)->GetObjectField(env, peer, xFontPeerIDs.xfsname);

	if (JNU_IsNull(env, xfsname))
	xfontset = "";
	else
	xfontset = (char *)JNU_GetStringPlatformChars(env, xfsname, NULL);

	realxlfd = malloc(strlen(xfontset) + 50);

	prev = ptr = xfontset;
	while ((ptr = strstr(ptr, "%d"))) {
	char save = *(ptr + 2);

	*(ptr + 2) = '\0';
	jio_snprintf(realxlfd + length, strlen(xfontset) + 50 - length,
	prev, size);
	length = strlen(realxlfd);
	*(ptr + 2) = save;

	prev = ptr + 2;
	ptr += 2;
	}
	strcpy(realxlfd + length, prev);

	#ifdef FONT_DEBUG
	strcpy(xx, realxlfd);
	#endif
	xfs = XCreateFontSet(awt_display, realxlfd, &missing_list,
	&missing_count, &def_string);
	#if FONT_DEBUG >= 2
	fprintf(stderr, "XCreateFontSet(%s)->0x%x\n", xx, xfs);
	#endif

	#if FONT_DEBUG
	if (missing_count != 0) {
	int32_t i;
	fprintf(stderr, "XCreateFontSet missing %d fonts:\n", missing_count);
	for (i = 0; i < missing_count; ++i) {
	fprintf(stderr, "\t\"%s\"\n", missing_list[i]);
	}
	fprintf(stderr, " requested \"%s\"\n", xx);
	#if FONT_DEBUG >= 3
	exit(-1);
	#endif
	}
	#endif

	free((void *)realxlfd);

	if (xfontset && !JNU_IsNull(env, xfsname))
	JNU_ReleaseStringPlatformChars(env, xfsname, (const char *) xfontset);

	(*env)->DeleteLocalRef(env, peer);
	(*env)->DeleteLocalRef(env, xfsname);
	return xfs;
	}

	/*
	* get multi font string width with multiple X11 font
	*
	* ASSUMES: We are not running on a privileged thread
	*/
	int32_t
	awtJNI_GetMFStringWidth(JNIEnv * env, jcharArray s, int offset, int sLength, jobject font)
	{
	char *err = NULL;
	unsigned char *stringData = NULL;
	char *offsetStringData = NULL;
	int32_t stringCount, i;
	int32_t size;
	struct FontData *fdata = NULL;
	jobject fontDescriptor = NULL;
	jbyteArray data = NULL;
	int32_t j;
	int32_t width = 0;
	int32_t length;
	XFontStruct *xf = NULL;
	jobjectArray dataArray = NULL;
	if ((*env)->EnsureLocalCapacity(env, 3) < 0)
	return 0;

	if (!JNU_IsNull(env, s) && !JNU_IsNull(env, font))
	{
	jobject peer;
	peer = (*env)->CallObjectMethod(env,font,fontIDs.getPeer);

	dataArray = (*env)->CallObjectMethod(
	env,
	peer,
	platformFontIDs.makeConvertedMultiFontChars,
	s, offset, sLength);

	if ((*env)->ExceptionOccurred(env))
	{
	(*env)->ExceptionDescribe(env);
	(*env)->ExceptionClear(env);
	}

	(*env)->DeleteLocalRef(env, peer);

	if(dataArray == NULL)
	{
	return 0;
	}
	} else {
	return 0;
	}

	fdata = awtJNI_GetFontData(env, font, &err);
	if ((*env)->ExceptionCheck(env)) {
	(*env)->DeleteLocalRef(env, dataArray);
	return 0;
	}

	stringCount = (*env)->GetArrayLength(env, dataArray);

	size = (*env)->GetIntField(env, font, fontIDs.size);

	for (i = 0; i < stringCount; i+=2)
	{
	fontDescriptor = (*env)->GetObjectArrayElement(env, dataArray, i);
	data = (*env)->GetObjectArrayElement(env, dataArray, i + 1);

	/* Bail if we've finished */
	if (fontDescriptor == NULL \|\| data == NULL) {
	(*env)->DeleteLocalRef(env, fontDescriptor);
	(*env)->DeleteLocalRef(env, data);
	break;
	}

	j = awtJNI_GetFontDescriptorNumber(env, font, fontDescriptor);
	if ((*env)->ExceptionCheck(env)) {
	(*env)->DeleteLocalRef(env, fontDescriptor);
	(*env)->DeleteLocalRef(env, data);
	break;
	}

	if (fdata->flist[j].load == 0) {
	xf = loadFont(awt_display,
	fdata->flist[j].xlfd, size * 10);
	if (xf == NULL) {
	(*env)->DeleteLocalRef(env, fontDescriptor);
	(*env)->DeleteLocalRef(env, data);
	continue;
	}
	fdata->flist[j].load = 1;
	fdata->flist[j].xfont = xf;
	if (xf->min_byte1 == 0 && xf->max_byte1 == 0)
	fdata->flist[j].index_length = 1;
	else
	fdata->flist[j].index_length = 2;
	}
	xf = fdata->flist[j].xfont;

	stringData =
	(unsigned char )(env)->GetPrimitiveArrayCritical(env, data,NULL);
	if (stringData == NULL) {
	(*env)->DeleteLocalRef(env, fontDescriptor);
	(*env)->DeleteLocalRef(env, data);
	(*env)->ExceptionClear(env);
	JNU_ThrowOutOfMemoryError(env, "Could not get string data");
	break;
	}

	length = (stringData[0] << 24) \| (stringData[1] << 16) \|
	(stringData[2] << 8) \| stringData[3];
	offsetStringData = (char )(stringData + (4 sizeof(char)));

	if (fdata->flist[j].index_length == 2) {
	width += XTextWidth16(xf, (XChar2b *)offsetStringData, length/2);
	} else {
	width += XTextWidth(xf, offsetStringData, length);
	}

	(*env)->ReleasePrimitiveArrayCritical(env, data, stringData, JNI_ABORT);
	(*env)->DeleteLocalRef(env, fontDescriptor);
	(*env)->DeleteLocalRef(env, data);
	}
	(*env)->DeleteLocalRef(env, dataArray);

	return width;
	}