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1
18 package org.apache.batik.transcoder.image;
19
20 import java.awt.image.BufferedImage  ;
21 import java.awt.image.DataBufferInt ;
22 import java.awt.image.SinglePixelPackedSampleModel ;
23 import java.io.IOException ;
24 import java.io.OutputStream ;
25
26 import org.apache.batik.ext.awt.image.codec.PNGEncodeParam;
27 import org.apache.batik.ext.awt.image.codec.PNGImageEncoder;
28 import org.apache.batik.ext.awt.image.rendered.IndexImage;
29 import org.apache.batik.transcoder.TranscoderException;
30 import org.apache.batik.transcoder.TranscoderOutput;
31 import org.apache.batik.transcoder.TranscodingHints;
32 import org.apache.batik.transcoder.image.resources.Messages;
33 import org.apache.batik.transcoder.keys.FloatKey;
34 import org.apache.batik.transcoder.keys.IntegerKey;
35
36
42 public class PNGTranscoder extends ImageTranscoder {
43
44
47 public PNGTranscoder() {
48 hints.put(KEY_FORCE_TRANSPARENT_WHITE, Boolean.FALSE);
49 }
50
51
56 public BufferedImage createImage(int width, int height) {
57 return new BufferedImage (width, height, BufferedImage.TYPE_INT_ARGB);
58 }
59
60
66 public void writeImage(BufferedImage img, TranscoderOutput output)
67 throws TranscoderException {
68
69 OutputStream ostream = output.getOutputStream();
70 if (ostream == null) {
71 throw new TranscoderException(
72 Messages.formatMessage("png.badoutput", null));
73 }
74
75 boolean forceTransparentWhite = false;
80
81 if (hints.containsKey(KEY_FORCE_TRANSPARENT_WHITE)) {
82 forceTransparentWhite =
83 ((Boolean )hints.get
84 (KEY_FORCE_TRANSPARENT_WHITE)).booleanValue();
85 }
86
87 if (forceTransparentWhite) {
88 int w = img.getWidth(), h = img.getHeight();
89 DataBufferInt biDB = (DataBufferInt )img.getRaster().getDataBuffer();
90 int scanStride = ((SinglePixelPackedSampleModel )
91 img.getSampleModel()).getScanlineStride();
92 int dbOffset = biDB.getOffset();
93 int pixels[] = biDB.getBankData()[0];
94 int p = dbOffset;
95 int adjust = scanStride - w;
96 int a=0, r=0, g=0, b=0, pel=0;
97 for(int i=0; i<h; i++){
98 for(int j=0; j<w; j++){
99 pel = pixels[p];
100 a = (pel >> 24) & 0xff;
101 r = (pel >> 16) & 0xff;
102 g = (pel >> 8 ) & 0xff;
103 b = pel & 0xff;
104 r = (255*(255 -a) + a*r)/255;
105 g = (255*(255 -a) + a*g)/255;
106 b = (255*(255 -a) + a*b)/255;
107 pixels[p++] =
108 (a<<24 & 0xff000000) |
109 (r<<16 & 0xff0000) |
110 (g<<8 & 0xff00) |
111 (b & 0xff);
112 }
113 p += adjust;
114 }
115 }
116
117 int n=-1;
118 if (hints.containsKey(KEY_INDEXED)) {
119 n=((Integer )hints.get(KEY_INDEXED)).intValue();
120 if (n==1||n==2||n==4||n==8)
121 img = IndexImage.getIndexedImage(img,1<<n);
123 }
124
125 PNGEncodeParam params = PNGEncodeParam.getDefaultEncodeParam(img);
126 if (params instanceof PNGEncodeParam.RGB) {
127 ((PNGEncodeParam.RGB)params).setBackgroundRGB
128 (new int [] { 255, 255, 255 });
129 }
130
131 if (hints.containsKey(KEY_GAMMA)) {
136 float gamma = ((Float )hints.get(KEY_GAMMA)).floatValue();
137 if (gamma > 0) {
138 params.setGamma(gamma);
139 }
140 params.setChromaticity(DEFAULT_CHROMA);
141 } else {
142 params.setSRGBIntent(PNGEncodeParam.INTENT_PERCEPTUAL);
145 }
146
147
148 float PixSzMM = userAgent.getPixelUnitToMillimeter();
149 int numPix = (int)((1000/PixSzMM)+0.5);
151 params.setPhysicalDimension(numPix, numPix, 1);
153 try {
154 PNGImageEncoder pngEncoder = new PNGImageEncoder(ostream, params);
155 pngEncoder.encode(img);
156 ostream.flush();
157 } catch (IOException ex) {
158 throw new TranscoderException(ex);
159 }
160 }
161
162
166
191 public static final TranscodingHints.Key KEY_GAMMA
192 = new FloatKey();
193
194
197 public static final float[] DEFAULT_CHROMA = {
198 0.31270F, 0.329F, 0.64F, 0.33F, 0.3F, 0.6F, 0.15F, 0.06F
199 };
200
201
202
227 public static final TranscodingHints.Key KEY_INDEXED
228 = new IntegerKey();
229 }
230 |
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