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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/awt/peer/gtk/GdkFontPeer.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/awt/peer/gtk/GdkFontPeer.java')
-rw-r--r-- | libjava/classpath/gnu/java/awt/peer/gtk/GdkFontPeer.java | 545 |
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’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 ); + } + +} |