Glyf.java

/*
 * Copyright (c) 2013 Allogy Interactive.
 *
 * 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.
 */

package com.sun.pdfview;

import java.nio.ByteBuffer;

/**
 * A single glyph in a pdf font.  May be simple or compound via subclasses
 */
public class Glyf {
    /** If true, the glyf is compound */
    private boolean isCompound;
    
    /** the number of contours */
    private short numContours;
    
    /** the minimum x value */
    private short minX;
    
    /** the minimum y value */
    private short minY;
    
    /** the maximum x value */
    private short maxX;
    
    /** the maximum y value */
    private short maxY;
    
    /** 
     * Creates a new instance of glyf 
     * Don't use this directly, use <code>Glyf.getGlyf()</code>
     */
    protected Glyf() {
    }
    
    /**
     * Get a map from the given data
     *
     * This method reads the format, data and length variables of
     * the map.
     */
    public static Glyf getGlyf(ByteBuffer data) {
        short numContours = data.getShort();
        
        Glyf g = null;
        if (numContours == 0) {
            // no glyph data
            g = new Glyf();
        } else if (numContours == -1) {
            // compound glyf
            g = new GlyfCompound();
        } else if (numContours > 0) {
            // simple glyf
            g = new GlyfSimple();
        } else {
            throw new IllegalArgumentException("Unknown glyf type: " + 
                                               numContours);
        }
        
        g.setNumContours(numContours);
        g.setMinX(data.getShort());
        g.setMinY(data.getShort());
        g.setMaxX(data.getShort());
        g.setMaxY(data.getShort());
        
        // do glyphtype-specific parsing
        g.setData(data);
    
        return g;
    }
   
    /**
     * Set the data for this glyf.  Do nothing, since a glyf with
     * no contours has no glyf data.
     */
    public void setData(ByteBuffer data) {
        return;
    }
    
    /**
     * Get the data in this glyf as a byte buffer.  Return the basic
     * glyf data only, since there is no specific data.  This method returns
     * the data un-flipped, so subclasses can simply append to the allocated
     * buffer.
     */
    public ByteBuffer getData() {
        ByteBuffer buf = ByteBuffer.allocate(getLength());
        
        buf.putShort(getNumContours());
        buf.putShort(getMinX());
        buf.putShort(getMinY());
        buf.putShort(getMaxX());
        buf.putShort(getMaxY());
        
        // don't flip the buffer, since it may be used by subclasses
        return buf;
    }
    
    /**
     * Get the length of this glyf.  A glyf with no data has a length
     * of 10 (2 bytes each for 5 short values)
     */
    public short getLength() {
        return 10;
    }
    
    /**
     * Get whether this is a simple or compound glyf
     */
    public boolean isCompound() {
        return isCompound;
    }
    
    /** 
     * Set whether this is a simple or compound glyf
     */
    protected void setCompound(boolean isCompound) {
        this.isCompound = isCompound;
    }
    
    /**
     * Get the number of contours in this glyf
     */
    public short getNumContours() {
        return numContours;
    }
    
    /**
     * Set the number of contours in this glyf
     */
    protected void setNumContours(short numContours) {
        this.numContours = numContours;
    }
    
    /**
     * Get the minimum x in this glyf
     */
    public short getMinX() {
        return minX;
    }
    
    /**
     * Set the minimum X in this glyf
     */
    protected void setMinX(short minX) {
        this.minX = minX;
    }
    
    /**
     * Get the minimum y in this glyf
     */
    public short getMinY() {
        return minY;
    }
    
    /**
     * Set the minimum Y in this glyf
     */
    protected void setMinY(short minY) {
        this.minY = minY;
    }
    /**
     * Get the maximum x in this glyf
     */
    public short getMaxX() {
        return maxX;
    }
    
    /**
     * Set the maximum X in this glyf
     */
    protected void setMaxX(short maxX) {
        this.maxX = maxX;
    }
    
    /**
     * Get the maximum y in this glyf
     */
    public short getMaxY() {
        return maxY;
    }
    
    /**
     * Set the maximum Y in this glyf
     */
    protected void setMaxY(short maxY) {
        this.maxY = maxY;
    }
}