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
219
220
221
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.pdf;
import java.awt.image.DataBuffer;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.SampleModel;
import java.awt.image.SinglePixelPackedSampleModel;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.xmlgraphics.image.GraphicsUtil;
/**
* PDFImage implementation for alpha channel "images".
*/
public class AlphaRasterImage implements PDFImage {
private int bitsPerComponent;
private PDFDeviceColorSpace colorSpace;
private Raster alpha;
private String key;
/**
* Create a alpha channel image.
* Creates a new bitmap image with the given data.
*
* @param k the key to be used to lookup the image
* @param alpha the alpha channel raster
*/
public AlphaRasterImage(String k, Raster alpha) {
this.key = k;
//Enable the commented line below if 16-bit alpha channels are desired.
//Otherwise, we compress the alpha channel to 8 bit which should be sufficient.
//this.bitsPerComponent = alpha.getSampleModel().getSampleSize(0);
this.bitsPerComponent = 8;
this.colorSpace = new PDFDeviceColorSpace(PDFDeviceColorSpace.DEVICE_GRAY);
if (alpha == null) {
throw new NullPointerException("Parameter alpha must not be null");
}
this.alpha = alpha;
}
/**
* Create a alpha channel image.
* Extracts the alpha channel from the RenderedImage and creates a new bitmap image
* with the given data.
*
* @param k the key to be used to lookup the image
* @param image the image (must have an alpha channel)
*/
public AlphaRasterImage(String k, RenderedImage image) {
this(k, GraphicsUtil.getAlphaRaster(image));
}
/** {@inheritDoc} */
public void setup(PDFDocument doc) {
//nop
}
/** {@inheritDoc} */
public String getKey() {
return key;
}
/** {@inheritDoc} */
public int getWidth() {
return alpha.getWidth();
}
/** {@inheritDoc} */
public int getHeight() {
return alpha.getHeight();
}
/** {@inheritDoc} */
public PDFDeviceColorSpace getColorSpace() {
return colorSpace;
}
/** {@inheritDoc} */
public int getBitsPerComponent() {
return bitsPerComponent;
}
/** {@inheritDoc} */
public boolean isTransparent() {
return false;
}
/** {@inheritDoc} */
public PDFColor getTransparentColor() {
return null;
}
/** {@inheritDoc} */
public String getMask() {
return null;
}
/** @return null (unless overridden) */
public String getSoftMask() {
return null;
}
/** {@inheritDoc} */
public PDFReference getSoftMaskReference() {
return null;
}
/** {@inheritDoc} */
public boolean isInverted() {
return false;
}
/** {@inheritDoc} */
public void outputContents(OutputStream out) throws IOException {
int w = getWidth();
int h = getHeight();
//Check Raster
int nbands = alpha.getNumBands();
if (nbands != 1) {
throw new UnsupportedOperationException(
"Expected only one band/component for the alpha channel");
}
//...and write the Raster line by line with a reusable buffer
int dataType = alpha.getDataBuffer().getDataType();
if (dataType == DataBuffer.TYPE_BYTE) {
byte[] line = new byte[nbands * w];
for (int y = 0; y < h; y++) {
alpha.getDataElements(0, y, w, 1, line);
out.write(line);
}
} else if (dataType == DataBuffer.TYPE_USHORT) {
short[] sline = new short[nbands * w];
byte[] line = new byte[nbands * w];
for (int y = 0; y < h; y++) {
alpha.getDataElements(0, y, w, 1, sline);
for (int i = 0; i < w; i++) {
//this compresses a 16-bit alpha channel to 8 bits!
//we probably don't ever need a 16-bit channel
line[i] = (byte)(sline[i] >> 8);
}
out.write(line);
}
} else if (dataType == DataBuffer.TYPE_INT) {
//Is there an better way to get a 8bit raster from a TYPE_INT raster?
int shift = 24;
SampleModel sampleModel = alpha.getSampleModel();
if (sampleModel instanceof SinglePixelPackedSampleModel) {
SinglePixelPackedSampleModel m = (SinglePixelPackedSampleModel)sampleModel;
shift = m.getBitOffsets()[0];
}
int[] iline = new int[nbands * w];
byte[] line = new byte[nbands * w];
for (int y = 0; y < h; y++) {
alpha.getDataElements(0, y, w, 1, iline);
for (int i = 0; i < w; i++) {
line[i] = (byte)(iline[i] >> shift);
}
out.write(line);
}
} else {
throw new UnsupportedOperationException("Unsupported DataBuffer type: "
+ alpha.getDataBuffer().getClass().getName());
}
}
/** {@inheritDoc} */
public void populateXObjectDictionary(PDFDictionary dict) {
//nop
}
/** {@inheritDoc} */
public PDFICCStream getICCStream() {
return null;
}
/** {@inheritDoc} */
public boolean isPS() {
return false;
}
/** {@inheritDoc} */
public String getFilterHint() {
return PDFFilterList.IMAGE_FILTER;
}
/** {@inheritDoc} */
public PDFFilter getPDFFilter() {
return null;
}
/** {@inheritDoc} */
public boolean multipleFiltersAllowed() {
return true;
}
}
|
