src/java/org/apache/fop/fonts/FontMetrics.java

/*
 * Copyright 1999-2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id$ */
 
package org.apache.fop.fonts;

import java.util.Map;


/**
 * Main interface for access to font metrics.
 */
public interface FontMetrics {

    /**
     * Returns the font name.
     * @return the font name
     */
    String getFontName();
    
    
    /**
     * Returns the type of the font.
     * @return the font type
     */
    FontType getFontType();
    

    /**
     * Returns the ascent of the font described by this
     * FontMetrics object.
     * @param size font size
     * @return ascent in milliponts
     */
    int getAscender(int size);
    
    /**
     * Returns the size of a capital letter measured from the font's baseline.
     * @param size font size
     * @return height of capital characters
     */
    int getCapHeight(int size);
    
    
    /**
     * Returns the descent of the font described by this
     * FontMetrics object.
     * @param size font size
     * @return descent in milliponts
     */
    int getDescender(int size);
    
    
    /**
     * Determines the typical font height of this
     * FontMetrics object
     * @param size font size
     * @return font height in millipoints
     */
    int getXHeight(int size);

    /**
     * Return the width (in 1/1000ths of point size) of the character at
     * code point i.
     * @param i code point index
     * @param size font size
     * @return the width of the character
     */
    int getWidth(int i, int size);

    /**
     * Return the array of widths.
     * <p>
     * This is used to get an array for inserting in an output format.
     * It should not be used for lookup.
     * @return an array of widths
     */
    int[] getWidths();
    
    /**
     * Indicates if the font has kering information.
     * @return True, if kerning is available.
     */
    boolean hasKerningInfo();
        
    /**
     * Returns the kerning map for the font.
     * @return the kerning map
     */
    Map getKerningInfo();
    
}