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

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