1 /*
   2  * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.java2d.pipe;
  27 
  28 import java.awt.Rectangle;
  29 import java.awt.Shape;
  30 import sun.java2d.SunGraphics2D;
  31 import sun.font.GlyphList;
  32 
  33 /*
  34  * This class uses the alpha graybits arrays from a GlyphList object to
  35  * drive a CompositePipe in much the same way as the antialiasing renderer.
  36  */
  37 public class TextRenderer extends GlyphListPipe {
  38 
  39     CompositePipe outpipe;
  40 
  41     public TextRenderer(CompositePipe pipe) {
  42         outpipe = pipe;
  43     }
  44 
  45     protected void drawGlyphList(SunGraphics2D sg2d, GlyphList gl) {
  46         int num = gl.getNumGlyphs();
  47         Region clipRegion = sg2d.getCompClip();
  48         int cx1 = clipRegion.getLoX();
  49         int cy1 = clipRegion.getLoY();
  50         int cx2 = clipRegion.getHiX();
  51         int cy2 = clipRegion.getHiY();
  52         Object ctx = null;
  53         try {
  54             int[] bounds = gl.getBounds();
  55             Rectangle r = new Rectangle(bounds[0], bounds[1],
  56                                         bounds[2] - bounds[0],
  57                                         bounds[3] - bounds[1]);
  58             Shape s = sg2d.untransformShape(r);
  59             ctx = outpipe.startSequence(sg2d, s, r, bounds);
  60             for (int i = 0; i < num; i++) {
  61                 gl.setGlyphIndex(i);
  62                 int[] metrics = gl.getMetrics();
  63                 int gx1 = metrics[0];
  64                 int gy1 = metrics[1];
  65                 int w = metrics[2];
  66                 int gx2 = gx1 + w;
  67                 int gy2 = gy1 + metrics[3];
  68                 int off = 0;
  69                 if (gx1 < cx1) {
  70                     off = cx1 - gx1;
  71                     gx1 = cx1;
  72                 }
  73                 if (gy1 < cy1) {
  74                     off += (cy1 - gy1) * w;
  75                     gy1 = cy1;
  76                 }
  77                 if (gx2 > cx2) gx2 = cx2;
  78                 if (gy2 > cy2) gy2 = cy2;
  79                 if (gx2 > gx1 && gy2 > gy1 &&
  80                     outpipe.needTile(ctx, gx1, gy1, gx2 - gx1, gy2 - gy1))
  81                 {
  82                     byte[] alpha = gl.getGrayBits();
  83                     outpipe.renderPathTile(ctx, alpha, off, w,
  84                                            gx1, gy1, gx2 - gx1, gy2 - gy1);
  85                 } else {
  86                     outpipe.skipTile(ctx, gx1, gy1);
  87                 }
  88             }
  89         } finally {
  90             if (ctx != null) {
  91                 outpipe.endSequence(ctx);
  92             }
  93         }
  94     }
  95 }