Source Code Cross Referenced for AreaAveragingScaleFilter.java in  » 6.0-JDK-Modules » j2me » java » awt » image » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Java Source Code / Java Documentation
1. 6.0 JDK Core
2. 6.0 JDK Modules
3. 6.0 JDK Modules com.sun
4. 6.0 JDK Modules com.sun.java
5. 6.0 JDK Modules sun
6. 6.0 JDK Platform
7. Ajax
8. Apache Harmony Java SE
9. Aspect oriented
10. Authentication Authorization
11. Blogger System
12. Build
13. Byte Code
14. Cache
15. Chart
16. Chat
17. Code Analyzer
18. Collaboration
19. Content Management System
20. Database Client
21. Database DBMS
22. Database JDBC Connection Pool
23. Database ORM
24. Development
25. EJB Server geronimo
26. EJB Server GlassFish
27. EJB Server JBoss 4.2.1
28. EJB Server resin 3.1.5
29. ERP CRM Financial
30. ESB
31. Forum
32. GIS
33. Graphic Library
34. Groupware
35. HTML Parser
36. IDE
37. IDE Eclipse
38. IDE Netbeans
39. Installer
40. Internationalization Localization
41. Inversion of Control
42. Issue Tracking
43. J2EE
44. JBoss
45. JMS
46. JMX
47. Library
48. Mail Clients
49. Net
50. Parser
51. PDF
52. Portal
53. Profiler
54. Project Management
55. Report
56. RSS RDF
57. Rule Engine
58. Science
59. Scripting
60. Search Engine
61. Security
62. Sevlet Container
63. Source Control
64. Swing Library
65. Template Engine
66. Test Coverage
67. Testing
68. UML
69. Web Crawler
70. Web Framework
71. Web Mail
72. Web Server
73. Web Services
74. Web Services apache cxf 2.0.1
75. Web Services AXIS2
76. Wiki Engine
77. Workflow Engines
78. XML
79. XML UI
Java
Java Tutorial
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.awt.image 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)AreaAveragingScaleFilter.java	1.12 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation. 
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt). 
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA 
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package java.awt.image;
029:
030:        import java.awt.image.ImageConsumer;
031:        import java.awt.image.ColorModel;
032:        import java.util.Hashtable;
033:        import java.awt.Rectangle;
034:
035:        /**
036:         * An ImageFilter class for scaling images using a simple area averaging
037:         * algorithm that produces smoother results than the nearest neighbor
038:         * algorithm.
039:         * This class extends the basic ImageFilter Class to scale an existing
040:         * image and provide a source for a new image containing the resampled
041:         * image.  The pixels in the source image are blended to produce pixels
042:         * for an image of the specified size.  The blending process is analogous
043:         * to scaling up the source image to a multiple of the destination size
044:         * using pixel replication and then scaling it back down to the destination
045:         * size by simply averaging all the pixels in the supersized image that
046:         * fall within a given pixel of the destination image.  If the data from
047:         * the source is not delivered in TopDownLeftRight order then the filter
048:         * will back off to a simple pixel replication behavior and utilize the
049:         * requestTopDownLeftRightResend() method to refilter the pixels in a
050:         * better way at the end.
051:         * It is meant to be used in conjunction with a FilteredImageSource
052:         * object to produce scaled versions of existing images.
053:         *
054:         * @see FilteredImageSource
055:         * @see ReplicateImageFilter
056:         * @see ImageFilter
057:         *
058:         * @version	1.8 08/19/02
059:         * @author 	Jim Graham
060:         */
061:        public class AreaAveragingScaleFilter extends ReplicateScaleFilter {
062:            private static final ColorModel rgbmodel = ColorModel
063:                    .getRGBdefault();
064:            private static final int neededHints = (TOPDOWNLEFTRIGHT | COMPLETESCANLINES);
065:            private boolean passthrough;
066:            private float reds[], greens[], blues[], alphas[];
067:            private int savedy;
068:            private int savedyrem;
069:
070:            /**
071:             * Constructs an AreaAveragingScaleFilter that scales the pixels from
072:             * its source Image as specified by the width and height parameters.
073:             * @param width the target width to scale the image
074:             * @param height the target height to scale the image
075:             */
076:            public AreaAveragingScaleFilter(int width, int height) {
077:                super (width, height);
078:            }
079:
080:            /**
081:             * Detect if the data is being delivered with the necessary hints
082:             * to allow the averaging algorithm to do its work.
083:             * @see ImageConsumer#setHints
084:             */
085:            public void setHints(int hints) {
086:                passthrough = ((hints & neededHints) != neededHints);
087:                super .setHints(hints);
088:            }
089:
090:            private void makeAccumBuffers() {
091:                reds = new float[destWidth];
092:                greens = new float[destWidth];
093:                blues = new float[destWidth];
094:                alphas = new float[destWidth];
095:            }
096:
097:            private int[] calcRow() {
098:                float mult = ((float) srcWidth) * srcHeight;
099:                if (outpixbuf == null || !(outpixbuf instanceof  int[])) {
100:                    outpixbuf = new int[destWidth];
101:                }
102:                int[] outpix = (int[]) outpixbuf;
103:                for (int x = 0; x < destWidth; x++) {
104:                    int a = Math.round(alphas[x] / mult);
105:                    int r = Math.round(reds[x] / mult);
106:                    int g = Math.round(greens[x] / mult);
107:                    int b = Math.round(blues[x] / mult);
108:                    if (a < 0) {
109:                        a = 0;
110:                    } else if (a > 255) {
111:                        a = 255;
112:                    }
113:                    if (r < 0) {
114:                        r = 0;
115:                    } else if (r > 255) {
116:                        r = 255;
117:                    }
118:                    if (g < 0) {
119:                        g = 0;
120:                    } else if (g > 255) {
121:                        g = 255;
122:                    }
123:                    if (b < 0) {
124:                        b = 0;
125:                    } else if (b > 255) {
126:                        b = 255;
127:                    }
128:                    outpix[x] = (a << 24 | r << 16 | g << 8 | b);
129:                }
130:                return outpix;
131:            }
132:
133:            private void accumPixels(int x, int y, int w, int h,
134:                    ColorModel model, Object pixels, int off, int scansize) {
135:                if (reds == null) {
136:                    makeAccumBuffers();
137:                }
138:                int sy = y;
139:                int syrem = destHeight;
140:                int dy, dyrem;
141:                if (sy == 0) {
142:                    dy = 0;
143:                    dyrem = 0;
144:                } else {
145:                    dy = savedy;
146:                    dyrem = savedyrem;
147:                }
148:                while (sy < y + h) {
149:                    int amty;
150:                    if (dyrem == 0) {
151:                        for (int i = 0; i < destWidth; i++) {
152:                            alphas[i] = reds[i] = greens[i] = blues[i] = 0f;
153:                        }
154:                        dyrem = srcHeight;
155:                    }
156:                    if (syrem < dyrem) {
157:                        amty = syrem;
158:                    } else {
159:                        amty = dyrem;
160:                    }
161:                    int sx = 0;
162:                    int dx = 0;
163:                    int sxrem = 0;
164:                    int dxrem = srcWidth;
165:                    float a = 0f, r = 0f, g = 0f, b = 0f;
166:                    while (sx < w) {
167:                        if (sxrem == 0) {
168:                            sxrem = destWidth;
169:                            int rgb;
170:                            if (pixels instanceof  byte[]) {
171:                                rgb = ((byte[]) pixels)[off + sx] & 0xff;
172:                            } else {
173:                                rgb = ((int[]) pixels)[off + sx];
174:                            }
175:                            rgb = model.getRGB(rgb);
176:                            a = rgb >>> 24;
177:                            r = (rgb >> 16) & 0xff;
178:                            g = (rgb >> 8) & 0xff;
179:                            b = rgb & 0xff;
180:                        }
181:                        int amtx;
182:                        if (sxrem < dxrem) {
183:                            amtx = sxrem;
184:                        } else {
185:                            amtx = dxrem;
186:                        }
187:                        float mult = ((float) amtx) * amty;
188:                        alphas[dx] += mult * a;
189:                        reds[dx] += mult * r;
190:                        greens[dx] += mult * g;
191:                        blues[dx] += mult * b;
192:                        if ((sxrem -= amtx) == 0) {
193:                            sx++;
194:                        }
195:                        if ((dxrem -= amtx) == 0) {
196:                            dx++;
197:                            dxrem = srcWidth;
198:                        }
199:                    }
200:                    if ((dyrem -= amty) == 0) {
201:                        int outpix[] = calcRow();
202:                        do {
203:                            consumer.setPixels(0, dy, destWidth, 1, rgbmodel,
204:                                    outpix, 0, destWidth);
205:                            dy++;
206:                        } while ((syrem -= amty) >= amty && amty == srcHeight);
207:                    } else {
208:                        syrem -= amty;
209:                    }
210:                    if (syrem == 0) {
211:                        syrem = destHeight;
212:                        sy++;
213:                        off += scansize;
214:                    }
215:                }
216:                savedyrem = dyrem;
217:                savedy = dy;
218:            }
219:
220:            /**
221:             * Combine the components for the delivered byte pixels into the
222:             * accumulation arrays and send on any averaged data for rows of
223:             * pixels that are complete.  If the correct hints were not
224:             * specified in the setHints call then relay the work to our
225:             * superclass which is capable of scaling pixels regardless of
226:             * the delivery hints.
227:             * @see ReplicateScaleFilter
228:             */
229:            public void setPixels(int x, int y, int w, int h, ColorModel model,
230:                    byte pixels[], int off, int scansize) {
231:                if (passthrough) {
232:                    super .setPixels(x, y, w, h, model, pixels, off, scansize);
233:                } else {
234:                    accumPixels(x, y, w, h, model, pixels, off, scansize);
235:                }
236:            }
237:
238:            /**
239:             * Combine the components for the delivered int pixels into the
240:             * accumulation arrays and send on any averaged data for rows of
241:             * pixels that are complete.  If the correct hints were not
242:             * specified in the setHints call then relay the work to our
243:             * superclass which is capable of scaling pixels regardless of
244:             * the delivery hints.
245:             * @see ReplicateScaleFilter
246:             */
247:            public void setPixels(int x, int y, int w, int h, ColorModel model,
248:                    int pixels[], int off, int scansize) {
249:                if (passthrough) {
250:                    super.setPixels(x, y, w, h, model, pixels, off, scansize);
251:                } else {
252:                    accumPixels(x, y, w, h, model, pixels, off, scansize);
253:                }
254:            }
255:        }
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.