1/*
2 * Copyright (c) 2000, 2004, 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
27
28package sun.awt.image;
29
30import java.awt.Point;
31import java.awt.image.BufferedImage;
32import java.awt.image.ColorModel;
33import java.awt.image.DataBuffer;
34import java.awt.image.DirectColorModel;
35import java.awt.image.PixelInterleavedSampleModel;
36import java.awt.image.SampleModel;
37import java.awt.image.SinglePixelPackedSampleModel;
38import java.awt.image.WritableRaster;
39import sun.java2d.SurfaceData;
40
41/**
42 * WritableRasterNative
43 * This class exists to wrap a native DataBuffer object.  The
44 * standard WritableRaster object assumes that a DataBuffer
45 * of a given type (e.g., DataBuffer.TYPE_INT) implies a certain
46 * subclass (e.g., DataBufferInt).  But this is not always the
47 * case.  DataBufferNative, for example, may allow access to
48 * integer-based data, but it is not DataBufferInt (which is a
49 * final class and cannot be subclassed).
50 * So this class exists simply to allow the WritableRaster
51 * functionality for this new kind of DataBuffer object.
52 */
53public class WritableRasterNative extends WritableRaster {
54
55    public static WritableRasterNative createNativeRaster(SampleModel sm,
56                                                          DataBuffer db)
57    {
58        return new WritableRasterNative(sm, db);
59    }
60
61    protected WritableRasterNative(SampleModel sm, DataBuffer db) {
62        super(sm, db, new Point(0, 0));
63    }
64
65    public static WritableRasterNative createNativeRaster(ColorModel cm,
66                                                          SurfaceData sd,
67                                                          int width,
68                                                          int height)
69    {
70        SampleModel smHw = null;
71        int dataType = 0;
72        int scanStride = width;
73
74        switch (cm.getPixelSize()) {
75        case 8:
76        case 12:
77            // 8-bits uses PixelInterleavedSampleModel
78            if (cm.getPixelSize() == 8) {
79                dataType = DataBuffer.TYPE_BYTE;
80            } else {
81                dataType = DataBuffer.TYPE_USHORT;
82            }
83            int[] bandOffsets = new int[1];
84            bandOffsets[0] = 0;
85            smHw = new PixelInterleavedSampleModel(dataType, width,
86                                                   height,
87                                                   1, scanStride,
88                                                   bandOffsets);
89            break;
90
91            // all others use SinglePixelPackedSampleModel
92        case 15:
93        case 16:
94            dataType = DataBuffer.TYPE_USHORT;
95            int[] bitMasks = new int[3];
96            DirectColorModel dcm = (DirectColorModel)cm;
97            bitMasks[0] = dcm.getRedMask();
98            bitMasks[1] = dcm.getGreenMask();
99            bitMasks[2] = dcm.getBlueMask();
100            smHw = new SinglePixelPackedSampleModel(dataType, width,
101                                                    height, scanStride,
102                                                    bitMasks);
103            break;
104        case 24:
105        case 32:
106            dataType = DataBuffer.TYPE_INT;
107            bitMasks = new int[3];
108            dcm = (DirectColorModel)cm;
109            bitMasks[0] = dcm.getRedMask();
110            bitMasks[1] = dcm.getGreenMask();
111            bitMasks[2] = dcm.getBlueMask();
112            smHw = new SinglePixelPackedSampleModel(dataType, width,
113                                                    height, scanStride,
114                                                    bitMasks);
115            break;
116        default:
117            throw new InternalError("Unsupported depth " +
118                                    cm.getPixelSize());
119        }
120
121        DataBuffer dbn = new DataBufferNative(sd, dataType,
122                                              width, height);
123        return new WritableRasterNative(smHw, dbn);
124    }
125}
126