Source Code Cross Referenced for LogOpImage.java in  » 6.0-JDK-Modules » Java-Advanced-Imaging » com » sun » media » jai » opimage » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » Java Advanced Imaging » com.sun.media.jai.opimage 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $RCSfile: LogOpImage.java,v $
003:         *
004:         * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * Use is subject to license terms.
007:         *
008:         * $Revision: 1.1 $
009:         * $Date: 2005/02/11 04:56:30 $
010:         * $State: Exp $
011:         */
012:        package com.sun.media.jai.opimage;
013:
014:        import javax.media.jai.ColormapOpImage;
015:        import java.awt.Rectangle;
016:        import java.awt.image.DataBuffer;
017:        import java.awt.image.Raster;
018:        import java.awt.image.RenderedImage;
019:        import java.awt.image.SampleModel;
020:        import java.awt.image.WritableRaster;
021:        import javax.media.jai.ImageLayout;
022:        import javax.media.jai.RasterAccessor;
023:        import javax.media.jai.RasterFormatTag;
024:        import java.util.Map;
025:        import com.sun.media.jai.util.ImageUtil;
026:
027:        /**
028:         * An <code>OpImage</code> implementing the "Log" operation as
029:         * described in <code>javax.media.jai.operator.LogDescriptor</code>.
030:         *
031:         * <p> This <code>OpImage</code> takes the natural logarithm of the pixel 
032:         * values of an image.  The operation is done on a per-pixel, per-band
033:         * basis.
034:         *
035:         * <p> For all integral data types, the log of 0 is set to 0.  For
036:         * signed integral data types (<code>short</code> and <code>int</code>),
037:         * the log of a negative pixel value is set to -1.
038:         *
039:         * <p> For all floating point data types ((<code>float</code> and
040:         * <code>double</code>), the log of 0 is set to <code>-Infinity</code>,
041:         * and the log of a negative pixel value is set to <code>NaN</code>.
042:         *
043:         * @see javax.media.jai.operator.LogDescriptor
044:         * @see LogCRIF
045:         *
046:         * @since EA2
047:         *
048:         */
049:        final class LogOpImage extends ColormapOpImage {
050:
051:            /** A lookup table for byte data type. */
052:            private byte[] byteTable = null;
053:
054:            /**
055:             * Constructor.
056:             *
057:             * <p> The layout of the source is used as the fall-back for
058:             * the layout of the destination.  Any layout parameters not
059:             * specified in the <code>layout</code> argument are set to
060:             * the same value as that of the source.
061:             *
062:             * @param source  The source image.
063:
064:             * @param layout  The destination image layout.
065:             */
066:            public LogOpImage(RenderedImage source, Map config,
067:                    ImageLayout layout) {
068:                super (source, layout, config, true);
069:
070:                /* Set flag to permit in-place operation. */
071:                permitInPlaceOperation();
072:
073:                // Initialize the colormap if necessary.
074:                initializeColormapOperation();
075:            }
076:
077:            /**
078:             * Transform the colormap according to the rescaling parameters.
079:             */
080:            protected void transformColormap(byte[][] colormap) {
081:                initByteTable();
082:
083:                for (int b = 0; b < 3; b++) {
084:                    byte[] map = colormap[b];
085:                    int mapSize = map.length;
086:
087:                    for (int i = 0; i < mapSize; i++) {
088:                        map[i] = byteTable[(map[i] & 0xFF)];
089:                    }
090:                }
091:            }
092:
093:            /**
094:             * Finds the natural logarithm of the pixels within a specified
095:             * rectangle.
096:             *
097:             * @param sources   Cobbled sources, guaranteed to provide all the
098:             *                  source data necessary for computing the rectangle.
099:             * @param dest      The tile containing the rectangle to be computed.
100:             * @param destRect  The rectangle within the tile to be computed.
101:             */
102:            protected void computeRect(Raster[] sources, WritableRaster dest,
103:                    Rectangle destRect) {
104:                /* Retrieve format tags. */
105:                RasterFormatTag[] formatTags = getFormatTags();
106:
107:                /* No need to mapSourceRect for PointOps. */
108:                RasterAccessor s = new RasterAccessor(sources[0], destRect,
109:                        formatTags[0], getSourceImage(0).getColorModel());
110:                RasterAccessor d = new RasterAccessor(dest, destRect,
111:                        formatTags[1], getColorModel());
112:
113:                switch (d.getDataType()) {
114:                case DataBuffer.TYPE_BYTE:
115:                    computeRectByte(s, d);
116:                    break;
117:                case DataBuffer.TYPE_USHORT:
118:                    computeRectUShort(s, d);
119:                    break;
120:                case DataBuffer.TYPE_SHORT:
121:                    computeRectShort(s, d);
122:                    break;
123:                case DataBuffer.TYPE_INT:
124:                    computeRectInt(s, d);
125:                    break;
126:                case DataBuffer.TYPE_FLOAT:
127:                    computeRectFloat(s, d);
128:                    break;
129:                case DataBuffer.TYPE_DOUBLE:
130:                    computeRectDouble(s, d);
131:                    break;
132:                }
133:
134:                if (d.needsClamping()) {
135:                    d.clampDataArrays();
136:                }
137:                d.copyDataToRaster();
138:            }
139:
140:            private void computeRectByte(RasterAccessor src, RasterAccessor dst) {
141:                initByteTable();
142:
143:                int srcLineStride = src.getScanlineStride();
144:                int srcPixelStride = src.getPixelStride();
145:                int[] srcBandOffsets = src.getBandOffsets();
146:                byte[][] srcData = src.getByteDataArrays();
147:
148:                int dstLineStride = dst.getScanlineStride();
149:                int dstPixelStride = dst.getPixelStride();
150:                int[] dstBandOffsets = dst.getBandOffsets();
151:                byte[][] dstData = dst.getByteDataArrays();
152:
153:                int dstWidth = dst.getWidth();
154:                int dstHeight = dst.getHeight();
155:                int dstBands = dst.getNumBands();
156:
157:                for (int b = 0; b < dstBands; b++) {
158:                    byte[] s = srcData[b];
159:                    byte[] d = dstData[b];
160:
161:                    int srcLineOffset = srcBandOffsets[b];
162:                    int dstLineOffset = dstBandOffsets[b];
163:
164:                    for (int h = 0; h < dstHeight; h++) {
165:                        int srcPixelOffset = srcLineOffset;
166:                        int dstPixelOffset = dstLineOffset;
167:
168:                        srcLineOffset += srcLineStride;
169:                        dstLineOffset += dstLineStride;
170:
171:                        for (int w = 0; w < dstWidth; w++) {
172:                            d[dstPixelOffset] = byteTable[s[srcPixelOffset]
173:                                    & ImageUtil.BYTE_MASK];
174:
175:                            srcPixelOffset += srcPixelStride;
176:                            dstPixelOffset += dstPixelStride;
177:                        }
178:                    }
179:                }
180:            }
181:
182:            private void computeRectUShort(RasterAccessor src,
183:                    RasterAccessor dst) {
184:
185:                int srcLineStride = src.getScanlineStride();
186:                int srcPixelStride = src.getPixelStride();
187:                int[] srcBandOffsets = src.getBandOffsets();
188:                short[][] srcData = src.getShortDataArrays();
189:
190:                int dstLineStride = dst.getScanlineStride();
191:                int dstPixelStride = dst.getPixelStride();
192:                int[] dstBandOffsets = dst.getBandOffsets();
193:                short[][] dstData = dst.getShortDataArrays();
194:
195:                int dstWidth = dst.getWidth();
196:                int dstHeight = dst.getHeight();
197:                int dstBands = dst.getNumBands();
198:
199:                for (int b = 0; b < dstBands; b++) {
200:                    short[] s = srcData[b];
201:                    short[] d = dstData[b];
202:
203:                    int srcLineOffset = srcBandOffsets[b];
204:                    int dstLineOffset = dstBandOffsets[b];
205:
206:                    for (int h = 0; h < dstHeight; h++) {
207:                        int srcPixelOffset = srcLineOffset;
208:                        int dstPixelOffset = dstLineOffset;
209:
210:                        srcLineOffset += srcLineStride;
211:                        dstLineOffset += dstLineStride;
212:
213:                        for (int w = 0; w < dstWidth; w++) {
214:                            /*
215:                             * For unsigned pixels, there are two choices:
216:                             * 0, or > 0.  The standard function takes care of all.
217:                             */
218:                            d[dstPixelOffset] = (short) (Math
219:                                    .log(s[srcPixelOffset]
220:                                            & ImageUtil.USHORT_MASK) + 0.5);
221:
222:                            srcPixelOffset += srcPixelStride;
223:                            dstPixelOffset += dstPixelStride;
224:                        }
225:                    }
226:                }
227:            }
228:
229:            private void computeRectShort(RasterAccessor src, RasterAccessor dst) {
230:
231:                int srcLineStride = src.getScanlineStride();
232:                int srcPixelStride = src.getPixelStride();
233:                int[] srcBandOffsets = src.getBandOffsets();
234:                short[][] srcData = src.getShortDataArrays();
235:
236:                int dstLineStride = dst.getScanlineStride();
237:                int dstPixelStride = dst.getPixelStride();
238:                int[] dstBandOffsets = dst.getBandOffsets();
239:                short[][] dstData = dst.getShortDataArrays();
240:
241:                int dstWidth = dst.getWidth();
242:                int dstHeight = dst.getHeight();
243:                int dstBands = dst.getNumBands();
244:
245:                for (int b = 0; b < dstBands; b++) {
246:                    short[] s = srcData[b];
247:                    short[] d = dstData[b];
248:
249:                    int srcLineOffset = srcBandOffsets[b];
250:                    int dstLineOffset = dstBandOffsets[b];
251:
252:                    for (int h = 0; h < dstHeight; h++) {
253:                        int srcPixelOffset = srcLineOffset;
254:                        int dstPixelOffset = dstLineOffset;
255:
256:                        srcLineOffset += srcLineStride;
257:                        dstLineOffset += dstLineStride;
258:
259:                        for (int w = 0; w < dstWidth; w++) {
260:                            /*
261:                             * For signed pixels, there are three choices:
262:                             * < 0, 0, > 0.  The standard function takes care of all.
263:                             */
264:                            d[dstPixelOffset] = (short) (Math
265:                                    .log(s[srcPixelOffset]) + 0.5);
266:
267:                            srcPixelOffset += srcPixelStride;
268:                            dstPixelOffset += dstPixelStride;
269:                        }
270:                    }
271:                }
272:            }
273:
274:            private void computeRectInt(RasterAccessor src, RasterAccessor dst) {
275:
276:                int srcLineStride = src.getScanlineStride();
277:                int srcPixelStride = src.getPixelStride();
278:                int[] srcBandOffsets = src.getBandOffsets();
279:                int[][] srcData = src.getIntDataArrays();
280:
281:                int dstLineStride = dst.getScanlineStride();
282:                int dstPixelStride = dst.getPixelStride();
283:                int[] dstBandOffsets = dst.getBandOffsets();
284:                int[][] dstData = dst.getIntDataArrays();
285:
286:                int dstWidth = dst.getWidth();
287:                int dstHeight = dst.getHeight();
288:                int dstBands = dst.getNumBands();
289:
290:                for (int b = 0; b < dstBands; b++) {
291:                    int[] s = srcData[b];
292:                    int[] d = dstData[b];
293:
294:                    int srcLineOffset = srcBandOffsets[b];
295:                    int dstLineOffset = dstBandOffsets[b];
296:
297:                    for (int h = 0; h < dstHeight; h++) {
298:                        int srcPixelOffset = srcLineOffset;
299:                        int dstPixelOffset = dstLineOffset;
300:
301:                        srcLineOffset += srcLineStride;
302:                        dstLineOffset += dstLineStride;
303:
304:                        for (int w = 0; w < dstWidth; w++) {
305:                            /*
306:                             * For signed pixels, there are three choices:
307:                             * < 0, 0, > 0.
308:                             */
309:                            double p = s[srcPixelOffset];
310:                            if (p > 0) {
311:                                d[dstPixelOffset] = (int) (Math.log(p) + 0.5);
312:                            } else if (p == 0) {
313:                                d[dstPixelOffset] = 0;
314:                            } else {
315:                                d[dstPixelOffset] = -1;
316:                            }
317:
318:                            srcPixelOffset += srcPixelStride;
319:                            dstPixelOffset += dstPixelStride;
320:                        }
321:                    }
322:                }
323:            }
324:
325:            private void computeRectFloat(RasterAccessor src, RasterAccessor dst) {
326:
327:                int srcLineStride = src.getScanlineStride();
328:                int srcPixelStride = src.getPixelStride();
329:                int[] srcBandOffsets = src.getBandOffsets();
330:                float[][] srcData = src.getFloatDataArrays();
331:
332:                int dstLineStride = dst.getScanlineStride();
333:                int dstPixelStride = dst.getPixelStride();
334:                int[] dstBandOffsets = dst.getBandOffsets();
335:                float[][] dstData = dst.getFloatDataArrays();
336:
337:                int dstWidth = dst.getWidth();
338:                int dstHeight = dst.getHeight();
339:                int dstBands = dst.getNumBands();
340:
341:                for (int b = 0; b < dstBands; b++) {
342:                    float[] s = srcData[b];
343:                    float[] d = dstData[b];
344:
345:                    int srcLineOffset = srcBandOffsets[b];
346:                    int dstLineOffset = dstBandOffsets[b];
347:
348:                    for (int h = 0; h < dstHeight; h++) {
349:                        int srcPixelOffset = srcLineOffset;
350:                        int dstPixelOffset = dstLineOffset;
351:
352:                        srcLineOffset += srcLineStride;
353:                        dstLineOffset += dstLineStride;
354:
355:                        for (int w = 0; w < dstWidth; w++) {
356:                            /*
357:                             * For signed pixels, there are three choices:
358:                             * < 0, 0, > 0.  The standard function takes care of all.
359:                             */
360:                            d[dstPixelOffset] = (float) Math
361:                                    .log(s[srcPixelOffset]);
362:
363:                            srcPixelOffset += srcPixelStride;
364:                            dstPixelOffset += dstPixelStride;
365:                        }
366:                    }
367:                }
368:            }
369:
370:            private void computeRectDouble(RasterAccessor src,
371:                    RasterAccessor dst) {
372:
373:                int srcLineStride = src.getScanlineStride();
374:                int srcPixelStride = src.getPixelStride();
375:                int[] srcBandOffsets = src.getBandOffsets();
376:                double[][] srcData = src.getDoubleDataArrays();
377:
378:                int dstLineStride = dst.getScanlineStride();
379:                int dstPixelStride = dst.getPixelStride();
380:                int[] dstBandOffsets = dst.getBandOffsets();
381:                double[][] dstData = dst.getDoubleDataArrays();
382:
383:                int dstWidth = dst.getWidth();
384:                int dstHeight = dst.getHeight();
385:                int dstBands = dst.getNumBands();
386:
387:                for (int b = 0; b < dstBands; b++) {
388:                    double[] s = srcData[b];
389:                    double[] d = dstData[b];
390:
391:                    int srcLineOffset = srcBandOffsets[b];
392:                    int dstLineOffset = dstBandOffsets[b];
393:
394:                    for (int h = 0; h < dstHeight; h++) {
395:                        int srcPixelOffset = srcLineOffset;
396:                        int dstPixelOffset = dstLineOffset;
397:
398:                        srcLineOffset += srcLineStride;
399:                        dstLineOffset += dstLineStride;
400:
401:                        for (int w = 0; w < dstWidth; w++) {
402:                            /*
403:                             * For signed pixels, there are three choices:
404:                             * < 0, 0, > 0.  The standard function takes care of all.
405:                             */
406:                            d[dstPixelOffset] = Math.log(s[srcPixelOffset]);
407:
408:                            srcPixelOffset += srcPixelStride;
409:                            dstPixelOffset += dstPixelStride;
410:                        }
411:                    }
412:                }
413:            }
414:
415:            private synchronized void initByteTable() {
416:
417:                if (byteTable != null)
418:                    return;
419:
420:                byteTable = new byte[0x100];
421:
422:                byteTable[0] = 0; // minimum byte value
423:                byteTable[1] = 0;
424:
425:                for (int i = 2; i < 0x100; i++) {
426:                    byteTable[i] = (byte) (Math.log(i) + 0.5);
427:                }
428:            }
429:        }
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