libjava/gnu/java/awt/peer/gtk/GdkGlyphVector.java

   1 /* GdkGlyphVector.java -- Glyph vector object
   2    Copyright (C) 2003, 2004, 2005  Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package gnu.java.awt.peer.gtk;
  40
  41 import java.awt.Font;
  42 import java.awt.Rectangle;
  43 import java.awt.Shape;
  44 import java.awt.font.FontRenderContext;
  45 import java.awt.font.GlyphJustificationInfo;
  46 import java.awt.font.GlyphMetrics;
  47 import java.awt.font.GlyphVector;
  48 import java.awt.geom.AffineTransform;
  49 import java.awt.geom.Point2D;
  50 import java.awt.geom.Rectangle2D;
  51
  52 public class GdkGlyphVector extends GlyphVector
  53 {
  54
  55   /* We use a simple representation for glyph vectors here. Glyph i
  56    * consumes 8 doubles:
  57    *
  58    *      logical x: extents[ 10*i     ]
  59    *      logical y: extents[ 10*i + 1 ]
  60    *  logical width: extents[ 10*i + 2 ]
  61    * logical height: extents[ 10*i + 3 ]
  62    *
  63    *       visual x: extents[ 10*i + 4 ]
  64    *       visual y: extents[ 10*i + 5 ]
  65    *   visual width: extents[ 10*i + 6 ]
  66    *  visual height: extents[ 10*i + 7 ]
  67    *
  68    *   origin pos x: extents[ 10*i + 8 ]
  69    *   origin pos y: extents[ 10*i + 9 ]
  70    *
  71    * as well as one int, code[i], representing the glyph code in the font.
  72    */
  73
  74   double [] extents;
  75   int [] codes;
  76
  77   Font font;
  78   FontRenderContext fontRenderContext;
  79
  80   Rectangle2D allLogical;
  81   Rectangle2D allVisual;
  82
  83   public GdkGlyphVector(double[] extents, int[] codes, Font font, FontRenderContext frc)
  84   {
  85     this.extents = extents;
  86     this.codes = codes;
  87     this.font = font;
  88     this.fontRenderContext = frc;
  89
  90     allLogical = new Rectangle2D.Double();
  91     allVisual = new Rectangle2D.Double();
  92
  93     for (int i = 0; i < codes.length; ++i)
  94       {
  95         allLogical.add (new Rectangle2D.Double(extents[10*i    ] + extents[10*i + 8],
  96                                                extents[10*i + 1] + extents[10*i + 9],
  97                                                extents[10*i + 2],
  98                                                extents[10*i + 3]));
  99
 100         allVisual.add (new Rectangle2D.Double(extents[10*i + 4] + extents[10*i + 8],
 101                                               extents[10*i + 5] + extents[10*i + 9],
 102                                               extents[10*i + 6],
 103                                               extents[10*i + 7]));
 104       }
 105   }
 106
 107   /*
 108      geometric notes:
 109
 110      the FRC contains a mapping from points -> pixels.
 111
 112      typographics points are typically 1/72 of an inch.
 113
 114      pixel displays are often around 72 dpi.
 115
 116      so the FRC can get away with using an identity transform on a screen,
 117      often. behavior is documented by sun to fall back to an identity
 118      transform if the internal transformation is null.
 119
 120      coordinates coming up from pango are expressed as floats -- in device
 121      space, so basically pixels-with-fractional-bits -- derived from their
 122      storage format in pango (1024ths of pixels).
 123
 124      it is not clear from the javadocs whether the results of methods like
 125      getGlyphPositions ought to return coordinates in device space, or
 126      "point" space, or what. for now I'm returning them in device space.
 127
 128    */
 129
 130   public double[] getExtents()
 131   {
 132     return extents;
 133   }
 134
 135   public int[] getCodes()
 136   {
 137     return codes;
 138   }
 139
 140   public Font getFont ()
 141   {
 142     return font;
 143   }
 144
 145   public FontRenderContext getFontRenderContext ()
 146   {
 147     return fontRenderContext;
 148   }
 149
 150   public int getGlyphCharIndex (int glyphIndex)
 151   {
 152     // FIXME: currently pango does not provide glyph-by-glyph
 153     // reverse mapping information, so we assume a broken 1:1
 154     // glyph model here. This is plainly wrong.
 155     return glyphIndex;
 156   }
 157
 158   public int[] getGlyphCharIndices (int beginGlyphIndex,
 159                                     int numEntries,
 160                                     int[] codeReturn)
 161   {
 162     int ix[] = codeReturn;
 163     if (ix == null)
 164       ix = new int[numEntries];
 165
 166     for (int i = 0; i < numEntries; i++)
 167       ix[i] = getGlyphCharIndex (beginGlyphIndex + i);
 168     return ix;
 169   }
 170
 171   public int getGlyphCode (int glyphIndex)
 172   {
 173     return codes[glyphIndex];
 174   }
 175
 176   public int[] getGlyphCodes (int beginGlyphIndex, int numEntries,
 177                               int[] codeReturn)
 178   {
 179     if (codeReturn == null)
 180       codeReturn = new int[numEntries];
 181
 182     System.arraycopy(codes, beginGlyphIndex, codeReturn, 0, numEntries);
 183     return codeReturn;
 184   }
 185
 186   public Shape getGlyphLogicalBounds (int i)
 187   {
 188     return new Rectangle2D.Double (extents[8*i], extents[8*i + 1],
 189                                    extents[8*i + 2], extents[8*i + 3]);
 190   }
 191
 192   public GlyphMetrics getGlyphMetrics (int i)
 193   {
 194     // FIXME: pango does not yield vertical layout information at the
 195     // moment.
 196
 197     boolean is_horizontal = true;
 198     double advanceX = extents[8*i + 2]; // "logical width" == advanceX
 199     double advanceY = 0;
 200
 201     return new GlyphMetrics (is_horizontal,
 202                              (float) advanceX, (float) advanceY,
 203                              (Rectangle2D) getGlyphVisualBounds(i),
 204                              GlyphMetrics.STANDARD);
 205   }
 206
 207   public Shape getGlyphOutline (int glyphIndex)
 208   {
 209     throw new UnsupportedOperationException ();
 210   }
 211
 212   public Shape getGlyphOutline (int glyphIndex, float x, float y)
 213   {
 214     throw new UnsupportedOperationException ();
 215   }
 216
 217   public Rectangle getGlyphPixelBounds (int i,
 218                                         FontRenderContext renderFRC,
 219                                         float x, float y)
 220   {
 221     return new Rectangle((int) x, (int) y,
 222                          (int) extents[8*i + 6], (int) extents[8*i + 7]);
 223   }
 224
 225   public Point2D getGlyphPosition (int i)
 226   {
 227     return new Point2D.Double (extents[10*i + 8],
 228                                extents[10*i + 9]);
 229   }
 230
 231   public float[] getGlyphPositions (int beginGlyphIndex,
 232                                     int numEntries,
 233                                     float[] positionReturn)
 234   {
 235     float fx[] = positionReturn;
 236     if (fx == null)
 237       fx = new float[numEntries * 2];
 238
 239     for (int i = 0; i < numEntries; ++i)
 240       {
 241         fx[2*i    ] = (float) extents[10*i + 8];
 242         fx[2*i + 1] = (float) extents[10*i + 9];
 243       }
 244     return fx;
 245   }
 246
 247   public AffineTransform getGlyphTransform (int glyphIndex)
 248   {
 249     // Glyphs don't have independent transforms in these simple glyph
 250     // vectors; docs specify null is an ok return here.
 251     return null;
 252   }
 253
 254   public Shape getGlyphVisualBounds (int i)
 255   {
 256     return new Rectangle2D.Double(extents[8*i + 4], extents[8*i + 5],
 257                                   extents[8*i + 6], extents[8*i + 7]);
 258   }
 259
 260   public int getLayoutFlags ()
 261   {
 262     return 0;
 263   }
 264
 265   public Rectangle2D getLogicalBounds ()
 266   {
 267     return allLogical;
 268   }
 269
 270   public int getNumGlyphs ()
 271   {
 272     return codes.length;
 273   }
 274
 275   public Shape getOutline ()
 276   {
 277     throw new UnsupportedOperationException ();
 278   }
 279
 280   public Rectangle getPixelBounds (FontRenderContext renderFRC,
 281                                    float x, float y)
 282   {
 283     return new Rectangle((int)x,
 284                          (int)y,
 285                          (int) allVisual.getWidth(),
 286                          (int) allVisual.getHeight());
 287   }
 288
 289   public Rectangle2D getVisualBounds ()
 290   {
 291     return allVisual;
 292   }
 293
 294   public void performDefaultLayout ()
 295   {
 296   }
 297
 298   public void setGlyphPosition (int i, Point2D newPos)
 299   {
 300     extents[8*i    ] = newPos.getX();
 301     extents[8*i + 1] = newPos.getY();
 302
 303     extents[8*i + 4] = newPos.getX();
 304     extents[8*i + 5] = newPos.getY();
 305   }
 306
 307   public void setGlyphTransform (int glyphIndex,
 308                                  AffineTransform newTX)
 309   {
 310     // not yet.. maybe not ever?
 311     throw new UnsupportedOperationException ();
 312   }
 313
 314   public boolean equals(GlyphVector gv)
 315   {
 316     if (gv == null)
 317       return false;
 318
 319     if (! (gv instanceof GdkGlyphVector))
 320       return false;
 321
 322     GdkGlyphVector ggv = (GdkGlyphVector) gv;
 323
 324     if ((ggv.codes.length != this.codes.length)
 325         || (ggv.extents.length != this.extents.length))
 326       return false;
 327
 328     if ((ggv.font == null && this.font != null)
 329         || (ggv.font != null && this.font == null)
 330         || (!ggv.font.equals(this.font)))
 331       return false;
 332
 333     if ((ggv.fontRenderContext == null && this.fontRenderContext != null)
 334         || (ggv.fontRenderContext != null && this.fontRenderContext == null)
 335         || (!ggv.fontRenderContext.equals(this.fontRenderContext)))
 336       return false;
 337
 338     for (int i = 0; i < ggv.codes.length; ++i)
 339       if (ggv.codes[i] != this.codes[i])
 340         return false;
 341
 342     for (int i = 0; i < ggv.extents.length; ++i)
 343       if (ggv.extents[i] != this.extents[i])
 344         return false;
 345
 346     return true;
 347   }
 348
 349   public GlyphJustificationInfo getGlyphJustificationInfo(int idx)
 350   {
 351     throw new UnsupportedOperationException ();
 352   }
 353
 354   public Shape getOutline(float x, float y)
 355   {
 356     throw new UnsupportedOperationException ();
 357   }
 358
 359 }