/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2006 - 2013 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.fonts.awt;
import org.pentaho.reporting.libraries.fonts.LibFontsDefaults;
import org.pentaho.reporting.libraries.fonts.encoding.CodePointUtilities;
import org.pentaho.reporting.libraries.fonts.registry.BaselineInfo;
import org.pentaho.reporting.libraries.fonts.registry.FontContext;
import org.pentaho.reporting.libraries.fonts.registry.FontMetrics;
import org.pentaho.reporting.libraries.fonts.registry.FontNativeContext;
import org.pentaho.reporting.libraries.fonts.tools.FontStrictGeomUtility;
import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.font.LineMetrics;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.util.Arrays;
/**
* Creation-Date: 16.12.2005, 21:09:39
*
* @author Thomas Morgner
*/
public class AWTFontMetrics implements FontMetrics {
private static final Graphics2D[] graphics = new Graphics2D[ 4 ];
static {
graphics[ 0 ] = produce( false, false );
graphics[ 1 ] = produce( true, false );
graphics[ 2 ] = produce( false, true );
graphics[ 3 ] = produce( true, true );
}
private static Graphics2D produce( boolean antiAlias, boolean fractMetrics ) {
final BufferedImage image = new BufferedImage
( 1, 1, BufferedImage.TYPE_INT_ARGB );
final Graphics2D g2 = image.createGraphics();
if ( antiAlias ) {
g2.setRenderingHint
( RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_ON );
} else {
g2.setRenderingHint
( RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_OFF );
}
if ( fractMetrics ) {
g2.setRenderingHint( RenderingHints.KEY_FRACTIONALMETRICS,
RenderingHints.VALUE_FRACTIONALMETRICS_ON );
} else {
g2.setRenderingHint( RenderingHints.KEY_FRACTIONALMETRICS,
RenderingHints.VALUE_FRACTIONALMETRICS_OFF );
}
return g2;
}
private FontNativeContext record;
private Font font;
private long maxCharAdvance;
private char[] cpBuffer;
private FontRenderContext frc;
private long xheight;
private long ascent;
private long descent;
private long[] cachedWidths;
private BaselineInfo[] cachedBaselines;
private long leading;
private long maxAscent;
private long maxDescent;
private boolean uniformLineMetrics;
public AWTFontMetrics( final FontNativeContext record, final Font font, final FontContext context ) {
this.record = record;
this.font = font;
this.frc = new FontRenderContext( null, context.isAntiAliased(), context.isFractionalMetrics() );
final Graphics2D graphics = createGraphics( context );
// This is some sort of evil hack and does only play well as long as we deal with scalable fonts
// It will happily cause troubles with bitmap fonts.
java.awt.FontMetrics fontMetrics = graphics.getFontMetrics( font.deriveFont( font.getSize2D() * 1000 ) );
this.leading = fontMetrics.getLeading();
this.maxAscent = fontMetrics.getMaxAscent();
this.maxDescent = fontMetrics.getMaxDescent();
this.uniformLineMetrics = fontMetrics.hasUniformLineMetrics();
final Rectangle2D rect = this.font.getMaxCharBounds( frc );
this.maxCharAdvance = FontStrictGeomUtility.toInternalValue( rect.getWidth() );
this.ascent = FontStrictGeomUtility.toInternalValue( -rect.getY() );
this.descent = FontStrictGeomUtility.toInternalValue( rect.getHeight() + rect.getY() );
final GlyphVector gv = font.createGlyphVector( frc, "x" );
final Rectangle2D bounds = gv.getVisualBounds();
this.xheight = FontStrictGeomUtility.toInternalValue( bounds.getHeight() );
this.cpBuffer = new char[ 4 ];
this.cachedBaselines = new BaselineInfo[ 256 - 32 ];
this.cachedWidths = new long[ 256 - 32 ];
Arrays.fill( cachedWidths, -1 );
}
protected Graphics2D createGraphics( final FontContext context ) {
int idx = 0;
if ( context.isAntiAliased() ) {
idx += 1;
}
if ( context.isFractionalMetrics() ) {
idx += 2;
}
return graphics[ idx ];
}
public Font getFont() {
return font;
}
/**
* From the baseline to the
*
* @return
*/
public long getAscent() {
return ascent;
}
public long getDescent() {
return descent;
}
public long getLeading() {
return leading; //FontStrictGeomUtility.toInternalValue(fontMetrics.getLeading());
}
/**
* The height of the lowercase 'x'. This is used as hint, which size the lowercase characters will have.
*
* @return
*/
public long getXHeight() {
return xheight;
}
public long getOverlinePosition() {
return getLeading() - Math.max( 1000, getMaxHeight() / 20 );
}
public long getUnderlinePosition() {
return getLeading() + getMaxAscent() + Math.max( 1000, getMaxHeight() / 20 );
}
public long getStrikeThroughPosition() {
return getMaxAscent() - (long) ( LibFontsDefaults.DEFAULT_STRIKETHROUGH_POSITION * getXHeight() );
}
public long getMaxAscent() {
return maxAscent; //FontStrictGeomUtility.toInternalValue(fontMetrics.getMaxAscent());
}
public long getMaxDescent() {
return maxDescent; //FontStrictGeomUtility.toInternalValue(fontMetrics.getMaxDescent());
}
public long getMaxHeight() {
return getMaxAscent() + getMaxDescent() + getLeading();
}
public long getMaxCharAdvance() {
return maxCharAdvance;
}
public long getCharWidth( final int character ) {
if ( character >= 32 && character < 256 ) {
// can be cached ..
final int index = character - 32;
final long cachedWidth = cachedWidths[ index ];
if ( cachedWidth >= 0 ) {
return cachedWidth;
}
final int retval = CodePointUtilities.toChars( character, cpBuffer, 0 );
if ( retval > 0 ) {
final Rectangle2D lm = font.getStringBounds( cpBuffer, 0, retval, frc );
final long width = FontStrictGeomUtility.toInternalValue( lm.getWidth() );
cachedWidths[ index ] = width;
return width;
} else {
cachedWidths[ index ] = 0;
return 0;
}
}
final int retval = CodePointUtilities.toChars( character, cpBuffer, 0 );
if ( retval > 0 ) {
final Rectangle2D lm = font.getStringBounds( cpBuffer, 0, retval, frc );
return FontStrictGeomUtility.toInternalValue( lm.getWidth() );
} else {
return 0;
}
}
/**
* This method is <b>EXPENSIVE</b>.
*
* @param previous
* @param character
* @return
*/
public long getKerning( final int previous, final int character ) {
final int retvalC1 = CodePointUtilities.toChars( previous, cpBuffer, 0 );
if ( retvalC1 <= 0 ) {
return 0;
}
final int retvalC2 = CodePointUtilities.toChars( character, cpBuffer, retvalC1 );
if ( retvalC2 > 0 ) {
final int limit = ( retvalC1 + retvalC2 );
final GlyphVector gv = font.createGlyphVector( frc, new String( cpBuffer, 0, limit ) );
final long totalSize = FontStrictGeomUtility.toInternalValue( gv.getGlyphPosition( limit ).getX() );
final long renderedWidth = FontStrictGeomUtility.toInternalValue( gv.getOutline().getBounds2D().getWidth() );
return totalSize - renderedWidth;
} else {
return 0;
}
}
/**
* Baselines are defined for scripts, not glyphs. A glyph carries script information most of the time (unless it is a
* neutral characters or just weird).
* <p/>
* The baseline info does not take any leading into account.
*
* @param c the character that is used to select the script type.
* @return
*/
public BaselineInfo getBaselines( final int c, BaselineInfo info ) {
final boolean cacheable = ( c >= 32 && c < 256 );
if ( cacheable ) {
final BaselineInfo fromCache = cachedBaselines[ c - 32 ];
if ( fromCache != null ) {
if ( info == null ) {
info = new BaselineInfo();
}
info.update( fromCache );
return info;
}
}
cpBuffer[ 0 ] = (char) ( c & 0xFFFF );
final LineMetrics lm = font.getLineMetrics( cpBuffer, 0, 1, frc );
final float[] bls = lm.getBaselineOffsets();
final int idx = lm.getBaselineIndex();
if ( info == null ) {
info = new BaselineInfo();
}
// The ascent is local - but we need the global baseline, relative to the
// MaxAscent.
final long maxAscent = getMaxAscent();
final long ascent = FontStrictGeomUtility.toInternalValue( lm.getAscent() );
final long delta = maxAscent - ascent;
info.setBaseline( BaselineInfo.MATHEMATICAL, delta + maxAscent - getXHeight() );
info.setBaseline( BaselineInfo.IDEOGRAPHIC, getMaxHeight() );
info.setBaseline( BaselineInfo.MIDDLE, maxAscent / 2 );
final long base = delta + ascent;
switch( idx ) {
case Font.CENTER_BASELINE: {
info.setBaseline( BaselineInfo.CENTRAL, base );
info.setBaseline( BaselineInfo.ALPHABETIC,
base + FontStrictGeomUtility.toInternalValue( bls[ Font.ROMAN_BASELINE ] ) );
info.setBaseline( BaselineInfo.HANGING,
base + FontStrictGeomUtility.toInternalValue( bls[ Font.HANGING_BASELINE ] ) );
info.setDominantBaseline( BaselineInfo.CENTRAL );
break;
}
case Font.HANGING_BASELINE: {
info.setBaseline( BaselineInfo.CENTRAL,
base + FontStrictGeomUtility.toInternalValue( bls[ Font.CENTER_BASELINE ] ) );
info.setBaseline( BaselineInfo.ALPHABETIC,
base + FontStrictGeomUtility.toInternalValue( bls[ Font.ROMAN_BASELINE ] ) );
info.setBaseline( BaselineInfo.HANGING, base );
info.setDominantBaseline( BaselineInfo.HANGING );
break;
}
default: // ROMAN Base-line
{
info.setBaseline( BaselineInfo.ALPHABETIC, base );
info.setBaseline( BaselineInfo.CENTRAL,
base + FontStrictGeomUtility.toInternalValue( bls[ Font.CENTER_BASELINE ] ) );
info.setBaseline( BaselineInfo.HANGING,
base + FontStrictGeomUtility.toInternalValue( bls[ Font.HANGING_BASELINE ] ) );
info.setDominantBaseline( BaselineInfo.ALPHABETIC );
break;
}
}
if ( cacheable ) {
final BaselineInfo cached = new BaselineInfo();
cached.update( info );
cachedBaselines[ c - 32 ] = cached;
}
return info;
}
/**
* Is it guaranteed that the font always returns the same baseline info objct?
*
* @return true, if the baseline info in question is always the same, false otherwise.
*/
public boolean isUniformFontMetrics() {
return uniformLineMetrics;
}
/**
* Returns zero, as the AWT renderer will take care of the italic rendering already. We do not have to apply any
* special transformations to the font to make it look italic.
*
* @return always zero.
*/
public long getItalicAngle() {
return 0;
}
public FontNativeContext getNativeContext() {
return record;
}
}