/*
* @(#)Win32FontMetrics.java 1.6 95/11/24 Jim Graham
*
* Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
package sun.awt.win32;
import java.awt.*;
import java.util.Hashtable;
/**
* A font metrics object for a WServer font.
*
* @version 1.6 24 Nov 1995
* @author Jim Graham
*/
class Win32FontMetrics extends FontMetrics {
/**
* The widths of the first 256 characters.
*/
int widths[];
/**
* The standard ascent of the font. This is the logical height
* above the baseline for the Alphanumeric characters and should
* be used for determining line spacing. Note, however, that some
* characters in the font may extend above this height.
*/
int ascent;
/**
* The standard descent of the font. This is the logical height
* below the baseline for the Alphanumeric characters and should
* be used for determining line spacing. Note, however, that some
* characters in the font may extend below this height.
*/
int descent;
/**
* The standard leading for the font. This is the logical amount
* of space to be reserved between the descent of one line of text
* and the ascent of the next line. The height metric is calculated
* to include this extra space.
*/
int leading;
/**
* The standard height of a line of text in this font. This is
* the distance between the baseline of adjacent lines of text.
* It is the sum of the ascent+descent+leading. There is no
* guarantee that lines of text spaced at this distance will be
* disjoint; such lines may overlap if some characters overshoot
* the standard ascent and descent metrics.
*/
int height;
/**
* The maximum ascent for all characters in this font. No character
* will extend further above the baseline than this metric.
*/
int maxAscent;
/**
* The maximum descent for all characters in this font. No character
* will descend further below the baseline than this metric.
*/
int maxDescent;
/**
* The maximum possible height of a line of text in this font.
* Adjacent lines of text spaced this distance apart will be
* guaranteed not to overlap. Note, however, that many paragraphs
* that contain ordinary alphanumeric text may look too widely
* spaced if this metric is used to determine line spacing. The
* height field should be preferred unless the text in a given
* line contains particularly tall characters.
*/
int maxHeight;
/**
* The maximum advance width of any character in this font.
*/
int maxAdvance;
/**
* Calculate the metrics from the given WServer and font.
*/
public Win32FontMetrics(Font font) {
super(font);
init();
}
/**
* Get leading
*/
public int getLeading() {
return leading;
}
/**
* Get ascent.
*/
public int getAscent() {
return ascent;
}
/**
* Get descent
*/
public int getDescent() {
return descent;
}
/**
* Get height
*/
public int getHeight() {
return height;
}
/**
* Get maxAscent
*/
public int getMaxAscent() {
return maxAscent;
}
/**
* Get maxDescent
*/
public int getMaxDescent() {
return maxDescent;
}
/**
* Get maxAdvance
*/
public int getMaxAdvance() {
return maxAdvance;
}
/**
* Return the width of the specified string in this Font.
*/
public native int stringWidth(String str);
/**
* Return the width of the specified char[] in this Font.
*/
public native int charsWidth(char data[], int off, int len);
/**
* Return the width of the specified byte[] in this Font.
*/
public native int bytesWidth(byte data[], int off, int len);
/**
* Get the widths of the first 256 characters in the font.
*/
public int[] getWidths() {
return widths;
}
native void init();
static Hashtable table = new Hashtable();
static synchronized FontMetrics getFontMetrics(Font font) {
FontMetrics fm = (FontMetrics)table.get(font);
if (fm == null) {
table.put(font, fm = new Win32FontMetrics(font));
}
return fm;
}
}