/*
* $Id$
*
* Copyright (C) 2003-2015 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.awt.font.truetype;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.awt.image.WritableRaster;
import org.jnode.awt.font.renderer.GlyphRenderer;
import org.jnode.awt.font.renderer.RenderCache;
import org.jnode.awt.font.spi.AbstractTextRenderer;
import org.jnode.awt.font.spi.FontData;
import org.jnode.awt.font.spi.Glyph;
import org.jnode.awt.font.truetype.tables.CMapTable;
import org.jnode.awt.font.truetype.tables.GlyphTable;
import org.jnode.awt.font.truetype.tables.HorizontalHeaderTable;
import org.jnode.awt.font.truetype.tables.HorizontalMetricsTable;
import org.jnode.driver.video.Surface;
/**
* @author epr
*/
public class TTFTextRenderer extends AbstractTextRenderer {
/**
* Create a new instance
*
* @param renderCache
* @param fontMetrics
* @param fontData
*/
public TTFTextRenderer(RenderCache renderCache, FontMetrics fontMetrics,
FontData fontData) {
super(renderCache, fontMetrics, fontData);
}
public void render(Surface surface, Shape clip, AffineTransform tx,
CharSequence text, int x, int y, Color color) {
try {
final TTFFontData fd = (TTFFontData) fontData;
final int fontSize = fontMetrics.getFont().getSize();
final GlyphTable glyphTable = fd.getGlyphTable();
final CMapTable cmapTable = fd.getCMapTable();
if (!(cmapTable.getNrEncodingTables() > 0)) {
throw new RuntimeException("No Encoding is found!");
}
final CMapTable.EncodingTable encTable = cmapTable
.getEncodingTable(0);
if (encTable.getTableFormat() == null) {
throw new RuntimeException("The table is NUll!!");
}
final HorizontalHeaderTable hheadTable = fd
.getHorizontalHeaderTable();
final double ascent = hheadTable.getAscent();
final HorizontalMetricsTable hmTable = fd
.getHorizontalMetricsTable();
final double scale = fontSize / ascent;
final int textLength = text.length();
final WritableRaster alphaRaster = createAlphaRaster();
for (int i = 0; i < textLength; i++) {
// get the index for the needed glyph
final char ch = text.charAt(i);
final int index = encTable.getTableFormat().getGlyphIndex(ch);
if (ch != ' ') {
final Glyph g = glyphTable.getGlyph(index);
final GlyphRenderer renderer = renderCache.getRenderer(g,
ascent);
final Dimension d;
d = renderer.createGlyphRaster(alphaRaster, fontSize);
final Point2D minLoc = renderer.getMinLocation(fontSize);
final int dstX = x + (int) minLoc.getX();
final int dstY = y - d.height + (int) minLoc.getY();
surface.drawAlphaRaster(alphaRaster, tx, 0, 0, dstX, dstY,
d.width, d.height, color);
}
x += (scale * (double) hmTable.getAdvanceWidth(index));
}
} catch (Exception ex) {
log.error("Error drawing text", ex);
}
}
}