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 de.intarsys.pdf.cos.COSObject;
import java.io.ByteArrayInputStream;
import java.util.Arrays;
/**
* A common superclass for the single byte encoded font flavors.
*/
public abstract class PDSingleByteFont extends PDFont {
private PDGlyphs[] cachedGlyphs = new PDGlyphs[256];
// an array for the width of each glyph used
private int[] cachedWidths;
protected 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);
}
}