summaryrefslogtreecommitdiff
path: root/libjava/classpath/gnu/java/awt/peer/gtk/GdkFontPeer.java
diff options
context:
space:
mode:
Diffstat (limited to 'libjava/classpath/gnu/java/awt/peer/gtk/GdkFontPeer.java')
-rw-r--r--libjava/classpath/gnu/java/awt/peer/gtk/GdkFontPeer.java545
1 files changed, 545 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/peer/gtk/GdkFontPeer.java b/libjava/classpath/gnu/java/awt/peer/gtk/GdkFontPeer.java
new file mode 100644
index 000000000..6b099063f
--- /dev/null
+++ b/libjava/classpath/gnu/java/awt/peer/gtk/GdkFontPeer.java
@@ -0,0 +1,545 @@
+/* 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&#x2019;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 );
+ }
+
+}