de.intarsys.pdf.font.PDSingleByteFont Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package de.intarsys.pdf.font;

import java.io.ByteArrayInputStream;
import java.util.Arrays;

import de.intarsys.pdf.cos.COSObject;

/**
 * A common superclass for the single byte encoded font flavors.
 * 
 */
abstract public class PDSingleByteFont extends PDFont {

	private PDGlyphs[] cachedGlyphs = new PDGlyphs[256];

	// an array for the width of each glyph used
	private int[] cachedWidths;

	public PDSingleByteFont(COSObject object) {
		super(object);
	}

	@Override
	public PDGlyphs getGlyphsEncoded(int codepoint) {
		// we can access the cache directly as we expect a one byte codepoint
		PDGlyphs glyphs = cachedGlyphs[codepoint];
		if (glyphs == null) {
			glyphs = new PDGlyphs(this, codepoint);
			cachedGlyphs[codepoint] = glyphs;
		}
		return glyphs;
	}

	/**
	 * The glyph width of a codepoint in the font. codepoint refers to the
	 * encoded (possibly multibyte) value in the COSString.
	 * 
	 * In the standard case for single byte encoded fonts, the codepoint is the
	 * index in the /Widths array, holding the glyph width.
	 * 
	 * For multibyte fonts, see {@link PDFontType0}.
	 * 
	 * @param codepoint
	 *            The codepoint
	 * 
	 * @return The glyph width of a codepoint in the font
	 */
	@Override
	public int getGlyphWidthEncoded(int codepoint) {
		if (cachedWidths == null) {
			cachedWidths = createWidths();
		}
		if (codepoint < 0 || codepoint > cachedWidths.length) {
			return getMissingWidth();
		}
		return cachedWidths[codepoint];
	}

	/**
	 * The array of glyph widths.
	 * 
	 * @return The array of glyph widths.
	 */
	public int[] getGlyphWidths() {
		if (cachedWidths == null) {
			cachedWidths = createWidths();
		}
		return cachedWidths;
	}

	@Override
	public PDGlyphs getNextGlyphsEncoded(ByteArrayInputStream is) {
		int codepoint = is.read();
		if (codepoint == -1) {
			return null;
		}
		return getGlyphsEncoded(codepoint);
	}

	@Override
	public void invalidateCaches() {
		super.invalidateCaches();
		cachedWidths = null;
		Arrays.fill(cachedGlyphs, null);
	}

}