1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/* Copyright (C) 2004 Free Software Foundation
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 java.awt.image;
import java.awt.RenderingHints;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.Arrays;
/**
* @author Jerry Quinn (jlquinn@optonline.net)
*/
public class RescaleOp implements BufferedImageOp, RasterOp
{
private float[] scale;
private float[] offsets;
private RenderingHints hints = null;
public RescaleOp(float[] scaleFactors,
float[] offsets,
RenderingHints hints)
{
this.scale = scaleFactors;
this.offsets = offsets;
this.hints = hints;
}
public RescaleOp(float scaleFactor,
float offset,
RenderingHints hints)
{
scale = new float[]{ scaleFactor };
offsets = new float[]{offset};
this.hints = hints;
}
public final float[] getScaleFactors(float[] scaleFactors)
{
if (scaleFactors == null)
scaleFactors = new float[scale.length];
System.arraycopy(scale, 0, scaleFactors, 0, scale.length);
return scaleFactors;
}
public final float[] getOffsets(float[] offsets)
{
if (offsets == null)
offsets = new float[this.offsets.length];
System.arraycopy(this.offsets, 0, offsets, 0, this.offsets.length);
return offsets;
}
public final int getNumFactors()
{
return scale.length;
}
/* (non-Javadoc)
* @see java.awt.image.BufferedImageOp#getRenderingHints()
*/
public final RenderingHints getRenderingHints()
{
return hints;
}
/* (non-Javadoc)
* @see java.awt.image.BufferedImageOp#filter(java.awt.image.BufferedImage, java.awt.image.BufferedImage)
*/
public final BufferedImage filter(BufferedImage src, BufferedImage dst)
{
// TODO Make sure premultiplied alpha is handled correctly.
// TODO See that color conversion is handled.
// TODO figure out how to use rendering hints.
if (scale.length != offsets.length)
throw new IllegalArgumentException();
ColorModel scm = src.getColorModel();
if (dst == null) dst = createCompatibleDestImage(src, null);
WritableRaster wsrc = src.getRaster();
WritableRaster wdst = dst.getRaster();
// Share constant across colors except alpha
if (scale.length == 1 || scale.length == scm.getNumColorComponents())
{
// Construct a raster that doesn't include an alpha band.
int[] subbands = new int[scm.getNumColorComponents()];
for (int i=0; i < subbands.length; i++) subbands[i] = i;
wsrc =
wsrc.createWritableChild(wsrc.minX, wsrc.minY, wsrc.width, wsrc.height,
wsrc.minX, wsrc.minY, subbands);
}
// else all color bands
filter(wsrc, wdst);
return dst;
}
/* (non-Javadoc)
* @see java.awt.image.RasterOp#filter(java.awt.image.Raster, java.awt.image.WritableRaster)
*/
public final WritableRaster filter(Raster src, WritableRaster dest)
{
if (dest == null) dest = src.createCompatibleWritableRaster();
// Required sanity checks
if (src.numBands != dest.numBands || scale.length != offsets.length)
throw new IllegalArgumentException();
if (scale.length != 1 && scale.length != src.numBands)
throw new IllegalArgumentException();
// Create scaling arrays if needed
float[] lscale = scale;
float[] loff = offsets;
if (scale.length == 1)
{
lscale = new float[src.numBands];
Arrays.fill(lscale, scale[0]);
loff = new float[src.numBands];
Arrays.fill(loff, offsets[0]);
}
// TODO The efficiency here can be improved for various data storage
// patterns, aka SampleModels.
float[] pixel = new float[src.numBands];
for (int y = src.minY; y < src.height + src.minY; y++)
for (int x = src.minX; x < src.width + src.minX; x++)
{
src.getPixel(x, y, pixel);
for (int b = 0; b < src.numBands; b++)
pixel[b] = pixel[b] * lscale[b] + loff[b];
dest.setPixel(x, y, pixel);
}
return dest;
}
/* (non-Javadoc)
* @see java.awt.image.BufferedImageOp#createCompatibleDestImage(java.awt.image.BufferedImage, java.awt.image.ColorModel)
*/
public BufferedImage createCompatibleDestImage(BufferedImage src,
ColorModel dstCM)
{
if (dstCM == null) dstCM = src.getColorModel();
WritableRaster wr = src.getRaster().createCompatibleWritableRaster();
BufferedImage image
= new BufferedImage(dstCM, wr, src.isPremultiplied, null);
return image;
}
/* (non-Javadoc)
* @see java.awt.image.RasterOp#createCompatibleDestRaster(java.awt.image.Raster)
*/
public WritableRaster createCompatibleDestRaster(Raster src)
{
return src.createCompatibleWritableRaster();
}
/* (non-Javadoc)
* @see java.awt.image.BufferedImageOp#getBounds2D(java.awt.image.BufferedImage)
*/
public final Rectangle2D getBounds2D(BufferedImage src)
{
return src.getRaster().getBounds();
}
/* (non-Javadoc)
* @see java.awt.image.RasterOp#getBounds2D(java.awt.image.Raster)
*/
public final Rectangle2D getBounds2D(Raster src)
{
return src.getBounds();
}
/* (non-Javadoc)
* @see java.awt.image.BufferedImageOp#getPoint2D(java.awt.geom.Point2D, java.awt.geom.Point2D)
*/
public final Point2D getPoint2D(Point2D src, Point2D dst) {
if (dst == null) dst = (Point2D) src.clone();
else dst.setLocation(src);
return dst;
}
}
|
