| /* GdkFontPeer.java -- Implements FontPeer with GTK+ |
| Copyright (C) 1999, 2004, 2005, 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.awt.peer.gtk; |
| |
| import gnu.classpath.Configuration; |
| import gnu.classpath.Pointer; |
| |
| import gnu.java.awt.ClasspathToolkit; |
| import gnu.java.awt.peer.ClasspathFontPeer; |
| import gnu.java.awt.font.opentype.NameDecoder; |
| |
| import gnu.java.lang.CPStringBuilder; |
| |
| import java.awt.Font; |
| import java.awt.FontMetrics; |
| import java.awt.Toolkit; |
| import java.awt.font.FontRenderContext; |
| import java.awt.font.GlyphVector; |
| import java.awt.font.GlyphMetrics; |
| import java.awt.font.LineMetrics; |
| import java.awt.font.TextLayout; |
| import java.awt.geom.Rectangle2D; |
| import java.text.CharacterIterator; |
| import java.util.Locale; |
| import java.util.Map; |
| import java.nio.ByteBuffer; |
| import java.util.HashMap; |
| |
| public class GdkFontPeer extends ClasspathFontPeer |
| { |
| static final FontRenderContext DEFAULT_CTX = |
| new FontRenderContext(null, false, false); |
| |
| /** |
| * Caches TextLayout instances for use in charsWidth() and drawString(). |
| * The size of the cache has been chosen so that relativly large GUIs with |
| * text documents are still efficient. |
| */ |
| HashMap<String,TextLayout> textLayoutCache = new GtkToolkit.LRUCache<String,TextLayout>(500); |
| |
| private class GdkFontMetrics extends FontMetrics |
| { |
| |
| public GdkFontMetrics (Font font) |
| { |
| super(initFont(font)); |
| } |
| |
| public int stringWidth (String str) |
| { |
| TextLayout tl = textLayoutCache.get(str); |
| if (tl == null) |
| { |
| tl = new TextLayout(str, font, DEFAULT_CTX); |
| textLayoutCache.put(str, tl); |
| } |
| return (int) tl.getAdvance(); |
| } |
| |
| public int charWidth (char ch) |
| { |
| return stringWidth (new String (new char[] { ch })); |
| } |
| |
| public int charsWidth (char data[], int off, int len) |
| { |
| return stringWidth (new String (data, off, len)); |
| } |
| |
| public int getHeight() |
| { |
| return (int) height; |
| } |
| |
| public int getLeading () |
| { |
| return (int) (height - (ascent + descent)); |
| } |
| |
| public int getAscent () |
| { |
| return (int) ascent; |
| } |
| |
| public int getMaxAscent () |
| { |
| return (int) ascent; |
| } |
| |
| public int getDescent () |
| { |
| return (int) descent; |
| } |
| |
| public int getMaxDescent () |
| { |
| return (int) maxDescent; |
| } |
| |
| public int getMaxAdvance () |
| { |
| return (int) maxAdvance; |
| } |
| } |
| |
| static native void initStaticState(); |
| private final int native_state = GtkGenericPeer.getUniqueInteger (); |
| |
| /** |
| * Cache GlyphMetrics objects. |
| */ |
| private HashMap<Integer,GlyphMetrics> metricsCache; |
| |
| private static final int FONT_METRICS_ASCENT = 0; |
| private static final int FONT_METRICS_MAX_ASCENT = 1; |
| private static final int FONT_METRICS_DESCENT = 2; |
| private static final int FONT_METRICS_MAX_DESCENT = 3; |
| private static final int FONT_METRICS_MAX_ADVANCE = 4; |
| private static final int FONT_METRICS_HEIGHT = 5; |
| private static final int FONT_METRICS_UNDERLINE_OFFSET = 6; |
| private static final int FONT_METRICS_UNDERLINE_THICKNESS = 7; |
| |
| float ascent; |
| float descent; |
| float maxAscent; |
| float maxDescent; |
| float maxAdvance; |
| float height; |
| float underlineOffset; |
| float underlineThickness; |
| |
| GdkFontMetrics metrics; |
| |
| static |
| { |
| if (true) // GCJ LOCAL |
| { |
| System.loadLibrary("gtkpeer"); |
| } |
| |
| initStaticState (); |
| |
| } |
| |
| private ByteBuffer nameTable = null; |
| |
| /** |
| * The pointer to the native font data. |
| * |
| * This field is manipulated by native code. Don't change or remove |
| * without adjusting the native code. |
| */ |
| private Pointer nativeFont; |
| |
| private native void initState (); |
| private native void dispose (); |
| private native void setFont (String family, int style, int size); |
| |
| native synchronized void getFontMetrics(double [] metrics); |
| native synchronized void getTextMetrics(String str, double [] metrics); |
| |
| native void releasePeerGraphicsResource(); |
| |
| |
| protected void finalize () |
| { |
| releasePeerGraphicsResource(); |
| dispose (); |
| } |
| |
| /* |
| * Helpers for the 3-way overloading that this class seems to suffer |
| * from. Remove them if you feel like they're a performance bottleneck, |
| * for the time being I prefer my code not be written and debugged in |
| * triplicate. |
| */ |
| |
| private String buildString(CharacterIterator iter) |
| { |
| CPStringBuilder sb = new CPStringBuilder(); |
| for(char c = iter.first(); c != CharacterIterator.DONE; c = iter.next()) |
| sb.append(c); |
| return sb.toString(); |
| } |
| |
| private String buildString(CharacterIterator iter, int begin, int limit) |
| { |
| CPStringBuilder sb = new CPStringBuilder(); |
| int i = 0; |
| for(char c = iter.first(); c != CharacterIterator.DONE; c = iter.next(), i++) |
| { |
| if (begin <= i) |
| sb.append(c); |
| if (limit <= i) |
| break; |
| } |
| return sb.toString(); |
| } |
| |
| private String buildString(char[] chars, int begin, int limit) |
| { |
| return new String(chars, begin, limit - begin); |
| } |
| |
| /* Public API */ |
| |
| public GdkFontPeer (String name, int style) |
| { |
| // All fonts get a default size of 12 if size is not specified. |
| this(name, style, 12); |
| } |
| |
| public GdkFontPeer (String name, int style, int size) |
| { |
| super(name, style, size); |
| initState (); |
| setFont (this.familyName, this.style, (int)this.size); |
| metricsCache = new HashMap<Integer,GlyphMetrics>(); |
| setupMetrics(); |
| } |
| |
| public GdkFontPeer (String name, Map attributes) |
| { |
| super(name, attributes); |
| initState (); |
| setFont (this.familyName, this.style, (int)this.size); |
| metricsCache = new HashMap<Integer,GlyphMetrics>(); |
| setupMetrics(); |
| } |
| |
| |
| /** |
| * Makes sure to return a Font based on the given Font that has as |
| * peer a GdkFontPeer. Used in the initializer. |
| */ |
| static Font initFont(Font font) |
| { |
| if (font == null) |
| return new Font("Dialog", Font.PLAIN, 12); |
| else if (font.getPeer() instanceof GdkFontPeer) |
| return font; |
| else |
| { |
| ClasspathToolkit toolkit; |
| toolkit = (ClasspathToolkit) Toolkit.getDefaultToolkit(); |
| return toolkit.getFont(font.getName(), font.getAttributes()); |
| } |
| } |
| |
| private void setupMetrics() |
| { |
| double [] hires = new double[8]; |
| getFontMetrics(hires); |
| ascent = (float) hires[FONT_METRICS_ASCENT]; |
| maxAscent = (float) hires[FONT_METRICS_MAX_ASCENT]; |
| descent = (float) hires[FONT_METRICS_DESCENT]; |
| maxDescent = (float) hires[FONT_METRICS_MAX_DESCENT]; |
| maxAdvance = (float) hires[FONT_METRICS_MAX_ADVANCE]; |
| height = (float) hires[FONT_METRICS_HEIGHT]; |
| underlineOffset = (float) hires[FONT_METRICS_UNDERLINE_OFFSET]; |
| underlineThickness = (float) hires[FONT_METRICS_UNDERLINE_THICKNESS]; |
| } |
| |
| /** |
| * Unneeded, but implemented anyway. |
| */ |
| public String getSubFamilyName(Font font, Locale locale) |
| { |
| String name; |
| |
| if (locale == null) |
| locale = Locale.getDefault(); |
| |
| name = getName(NameDecoder.NAME_SUBFAMILY, locale); |
| if (name == null) |
| { |
| name = getName(NameDecoder.NAME_SUBFAMILY, Locale.ENGLISH); |
| if ("Regular".equals(name)) |
| name = null; |
| } |
| |
| return name; |
| } |
| |
| /** |
| * Returns the bytes belonging to a TrueType/OpenType table, |
| * Parameters n,a,m,e identify the 4-byte ASCII tag of the table. |
| * |
| * Returns null if the font is not TT, the table is nonexistant, |
| * or if some other unexpected error occured. |
| * |
| */ |
| private native byte[] getTrueTypeTable(byte n, byte a, byte m, byte e); |
| |
| /** |
| * Returns the PostScript name of the font, defaults to the familyName if |
| * a PS name could not be retrieved. |
| */ |
| public String getPostScriptName(Font font) |
| { |
| String name = getName(NameDecoder.NAME_POSTSCRIPT, |
| /* any language */ null); |
| if( name == null ) |
| return this.familyName; |
| |
| return name; |
| } |
| |
| /** |
| * Extracts a String from the font’s name table. |
| * |
| * @param name the numeric TrueType or OpenType name ID. |
| * |
| * @param locale the locale for which names shall be localized, or |
| * <code>null</code> if the locale does mot matter because the name |
| * is known to be language-independent (for example, because it is |
| * the PostScript name). |
| */ |
| private String getName(int name, Locale locale) |
| { |
| if (nameTable == null) |
| { |
| byte[] data = getTrueTypeTable((byte)'n', (byte) 'a', |
| (byte) 'm', (byte) 'e'); |
| if( data == null ) |
| return null; |
| |
| nameTable = ByteBuffer.wrap( data ); |
| } |
| |
| return NameDecoder.getName(nameTable, name, locale); |
| } |
| |
| public boolean canDisplay (Font font, int c) |
| { |
| // FIXME: inquire with pango |
| return true; |
| } |
| |
| public int canDisplayUpTo (Font font, CharacterIterator i, int start, int limit) |
| { |
| // FIXME: inquire with pango |
| return -1; |
| } |
| |
| public GlyphVector createGlyphVector (Font font, |
| FontRenderContext ctx, |
| CharacterIterator i) |
| { |
| return new FreetypeGlyphVector(font, buildString (i), ctx); |
| } |
| |
| public GlyphVector createGlyphVector (Font font, |
| FontRenderContext ctx, |
| int[] glyphCodes) |
| { |
| return new FreetypeGlyphVector(font, glyphCodes, ctx); |
| } |
| |
| public byte getBaselineFor (Font font, char c) |
| { |
| // FIXME: Actually check. |
| return Font.ROMAN_BASELINE; |
| } |
| |
| private class GdkFontLineMetrics extends LineMetrics |
| { |
| private int nchars; |
| public GdkFontLineMetrics (GdkFontPeer fp, int n) |
| { |
| nchars = n; |
| } |
| |
| public float getAscent() |
| { |
| return ascent; |
| } |
| |
| public int getBaselineIndex() |
| { |
| // FIXME |
| return Font.ROMAN_BASELINE; |
| } |
| |
| public float[] getBaselineOffsets() |
| { |
| return new float[3]; |
| } |
| |
| public float getDescent() |
| { |
| return descent; |
| } |
| |
| public float getHeight() |
| { |
| return height; |
| } |
| |
| public float getLeading() |
| { |
| return height - (ascent + descent); |
| } |
| |
| public int getNumChars() |
| { |
| return nchars; |
| } |
| |
| public float getStrikethroughOffset() |
| { |
| // FreeType doesn't seem to provide a value here. |
| return ascent / 2; |
| } |
| |
| public float getStrikethroughThickness() |
| { |
| // FreeType doesn't seem to provide a value here. |
| return 1.f; |
| } |
| |
| public float getUnderlineOffset() |
| { |
| return underlineOffset; |
| } |
| |
| public float getUnderlineThickness() |
| { |
| return underlineThickness; |
| } |
| |
| } |
| |
| public LineMetrics getLineMetrics (Font font, CharacterIterator ci, |
| int begin, int limit, FontRenderContext rc) |
| { |
| return new GdkFontLineMetrics (this, limit - begin); |
| } |
| |
| public Rectangle2D getMaxCharBounds (Font font, FontRenderContext rc) |
| { |
| throw new UnsupportedOperationException (); |
| } |
| |
| public int getMissingGlyphCode (Font font) |
| { |
| throw new UnsupportedOperationException (); |
| } |
| |
| public String getGlyphName (Font font, int glyphIndex) |
| { |
| throw new UnsupportedOperationException (); |
| } |
| |
| public int getNumGlyphs (Font font) |
| { |
| byte[] data = getTrueTypeTable((byte)'m', (byte) 'a', |
| (byte)'x', (byte) 'p'); |
| if( data == null ) |
| return -1; |
| |
| ByteBuffer buf = ByteBuffer.wrap( data ); |
| return buf.getShort(4); |
| } |
| |
| public boolean hasUniformLineMetrics (Font font) |
| { |
| return true; |
| } |
| |
| public GlyphVector layoutGlyphVector (Font font, FontRenderContext frc, |
| char[] chars, int start, int limit, |
| int flags) |
| { |
| return new FreetypeGlyphVector(font, chars, start, limit - start, |
| frc, flags); |
| } |
| |
| public LineMetrics getLineMetrics (Font font, String str, |
| FontRenderContext frc) |
| { |
| return new GdkFontLineMetrics (this, str.length ()); |
| } |
| |
| public FontMetrics getFontMetrics (Font font) |
| { |
| if (metrics == null) |
| metrics = new GdkFontMetrics(font); |
| return metrics; |
| } |
| |
| /** |
| * Returns a cached GlyphMetrics object for a given glyphcode, |
| * or null if it doesn't exist in the cache. |
| */ |
| GlyphMetrics getGlyphMetrics( int glyphCode ) |
| { |
| return metricsCache.get(new Integer(glyphCode)); |
| } |
| |
| /** |
| * Put a GlyphMetrics object in the cache. |
| */ |
| void putGlyphMetrics( int glyphCode, GlyphMetrics metrics ) |
| { |
| metricsCache.put( new Integer( glyphCode ), metrics ); |
| } |
| |
| } |