bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/gfx/AlphaAdjustmentImageDescriptor.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 /*\r
  13  * 22.12.2006\r
  14  */\r
  15 package org.simantics.utils.ui.gfx;\r
  16 \r
  17 import org.eclipse.jface.resource.ImageDescriptor;\r
  18 import org.eclipse.swt.SWT;\r
  19 import org.eclipse.swt.graphics.ImageData;\r
  20 \r
  21 /**\r
  22  * AlphaAdjustmentImageDescriptor multiplies alpha by (adjustment value/256)\r
  23  * <p>\r
  24  * Usage:\r
  25  * ImageDescriptor icon;\r
  26  * icon = AlphaAdjustmentImageDescriptor.adjustAlpha(icon, 128);\r
  27  * \r
  28  * @author Toni Kalajainen\r
  29  */\r
  30 public class AlphaAdjustmentImageDescriptor extends ImageDescriptor {\r
  31     \r
  32     public static ImageDescriptor adjustAlpha(ImageDescriptor desc, int alphaAdjustment)\r
  33     {\r
  34         if (alphaAdjustment==256) return desc;\r
  35         return new AlphaAdjustmentImageDescriptor(desc, alphaAdjustment);\r
  36     }\r
  37     \r
  38     int alphaAdjustment;\r
  39     ImageDescriptor desc;\r
  40     \r
  41     /**\r
  42      * \r
  43      * @param original\r
  44      * @param alphaAdjustment 0..256\r
  45      */\r
  46     public AlphaAdjustmentImageDescriptor(ImageDescriptor original, int alphaAdjustment)\r
  47     {\r
  48         assert(alphaAdjustment>=0 && alphaAdjustment<=256);\r
  49         assert(original!=null);\r
  50         this.alphaAdjustment = alphaAdjustment;\r
  51         this.desc = original;\r
  52     }\r
  53 \r
  54     @SuppressWarnings("deprecation")\r
  55     @Override\r
  56     public ImageData getImageData() {\r
  57         ImageData orig = ImageCache.getInstance().getImage(desc).getImageData();\r
  58         ImageData id = new ImageData(orig.width, orig.height, orig.depth, orig.palette);\r
  59         id.setAlpha(0,0,0);\r
  60         \r
  61         if (orig.getTransparencyType()==SWT.TRANSPARENCY_ALPHA ||\r
  62             orig.getTransparencyType()==SWT.TRANSPARENCY_NONE)\r
  63         {\r
  64             for (int x=0; x<orig.width; x++)\r
  65                 for (int y=0; y<orig.height; y++) {\r
  66                     id.setPixel(x, y, orig.getPixel(x, y));\r
  67                     int alpha = (orig.getAlpha(x, y) * alphaAdjustment) >> 8;\r
  68                     id.setAlpha(x, y, alpha);\r
  69                 }\r
  70         } else\r
  71         if (orig.getTransparencyType()==SWT.TRANSPARENCY_MASK ||\r
  72             orig.getTransparencyType()==SWT.TRANSPARENCY_PIXEL) {\r
  73             ImageData mask = orig.getTransparencyMask();\r
  74             for (int x=0; x<orig.width; x++)\r
  75                 for (int y=0; y<orig.height; y++) {\r
  76                     id.setPixel(x, y, orig.getPixel(x, y));\r
  77                     int alpha = (mask.getPixel(x, y)==1?alphaAdjustment:0);\r
  78                     id.setAlpha(x, y, alpha);\r
  79                 }\r
  80         }\r
  81         \r
  82         return id;\r
  83     }\r
  84     \r
  85     @Override\r
  86     public boolean equals(Object obj) {\r
  87         if (!(obj instanceof AlphaAdjustmentImageDescriptor))\r
  88             return false;\r
  89         AlphaAdjustmentImageDescriptor other = (AlphaAdjustmentImageDescriptor) obj;\r
  90         if (!other.desc.equals(desc))\r
  91             return false;\r
  92         if (other.alphaAdjustment!=alphaAdjustment)\r
  93             return false;\r
  94         return true;\r
  95     }\r
  96     \r
  97     @Override\r
  98     public int hashCode() {\r
  99         return desc.hashCode() ^ 0x58fb2 ^ alphaAdjustment;\r
 100     }\r
 101 \r
 102 }\r