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comparison org.eclipse.jface/src/org/eclipse/jface/resource/CompositeImageDescriptor.d @ 12:bc29606a740c

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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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11:43904fec5dca 12:bc29606a740c
1 /*******************************************************************************
2 * Copyright (c) 2000, 2007 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module org.eclipse.jface.resource.CompositeImageDescriptor;
14
15 import org.eclipse.jface.resource.ImageDescriptor;
16
17 import org.eclipse.swt.graphics.ImageData;
18 import org.eclipse.swt.graphics.PaletteData;
19 import org.eclipse.swt.graphics.Point;
20 import org.eclipse.swt.graphics.RGB;
21
22 import java.lang.all;
23 import java.util.Set;
24
25 /**
26 * Abstract base class for image descriptors that synthesize an image from other
27 * images in order to simulate the effect of custom drawing. For example, this
28 * could be used to superimpose a red bar dexter symbol across an image to
29 * indicate that something was disallowed.
30 * <p>
31 * Subclasses must implement the <code>getSize</code> and <code>fill</code>
32 * methods. Little or no work happens until the image descriptor's image is
33 * actually requested by a call to <code>createImage</code> (or to
34 * <code>getImageData</code> directly).
35 * </p>
36 */
37 public abstract class CompositeImageDescriptor : ImageDescriptor {
38
39 /**
40 * The image data for this composite image.
41 */
42 private ImageData imageData;
43
44 /**
45 * Constructs an uninitialized composite image.
46 */
47 protected this() {
48 }
49
50 /**
51 * Draw the composite images.
52 * <p>
53 * Subclasses must implement this framework method to paint images within
54 * the given bounds using one or more calls to the <code>drawImage</code>
55 * framework method.
56 * </p>
57 *
58 * @param width
59 * the width
60 * @param height
61 * the height
62 */
63 protected abstract void drawCompositeImage(int width, int height);
64
65 /**
66 * Draws the given source image data into this composite image at the given
67 * position.
68 * <p>
69 * Call this internal framework method to superimpose another image atop
70 * this composite image.
71 * </p>
72 *
73 * @param src
74 * the source image data
75 * @param ox
76 * the x position
77 * @param oy
78 * the y position
79 */
80 final protected void drawImage(ImageData src, int ox, int oy) {
81 ImageData dst = imageData;
82 PaletteData srcPalette = src.palette;
83 ImageData srcMask = null;
84 int alphaMask = 0, alphaShift = 0;
85 if (src.maskData !is null) {
86 srcMask = src.getTransparencyMask ();
87 if (src.depth is 32) {
88 alphaMask = ~(srcPalette.redMask | srcPalette.greenMask | srcPalette.blueMask);
89 while (alphaMask !is 0 && ((alphaMask >>> alphaShift) & 1) is 0) alphaShift++;
90 }
91 }
92 for (int srcY = 0, dstY = srcY + oy; srcY < src.height; srcY++, dstY++) {
93 for (int srcX = 0, dstX = srcX + ox; srcX < src.width; srcX++, dstX++) {
94 if (!(0 <= dstX && dstX < dst.width && 0 <= dstY && dstY < dst.height)) continue;
95 int srcPixel = src.getPixel(srcX, srcY);
96 int srcAlpha = 255;
97 if (src.maskData !is null) {
98 if (src.depth is 32) {
99 srcAlpha = (srcPixel & alphaMask) >>> alphaShift;
100 if (srcAlpha is 0) {
101 srcAlpha = srcMask.getPixel(srcX, srcY) !is 0 ? 255 : 0;
102 }
103 } else {
104 if (srcMask.getPixel(srcX, srcY) is 0) srcAlpha = 0;
105 }
106 } else if (src.transparentPixel !is -1) {
107 if (src.transparentPixel is srcPixel) srcAlpha = 0;
108 } else if (src.alpha !is -1) {
109 srcAlpha = src.alpha;
110 } else if (src.alphaData !is null) {
111 srcAlpha = src.getAlpha(srcX, srcY);
112 }
113 if (srcAlpha is 0) continue;
114 int srcRed, srcGreen, srcBlue;
115 if (srcPalette.isDirect) {
116 srcRed = srcPixel & srcPalette.redMask;
117 srcRed = (srcPalette.redShift < 0) ? srcRed >>> -srcPalette.redShift : srcRed << srcPalette.redShift;
118 srcGreen = srcPixel & srcPalette.greenMask;
119 srcGreen = (srcPalette.greenShift < 0) ? srcGreen >>> -srcPalette.greenShift : srcGreen << srcPalette.greenShift;
120 srcBlue = srcPixel & srcPalette.blueMask;
121 srcBlue = (srcPalette.blueShift < 0) ? srcBlue >>> -srcPalette.blueShift : srcBlue << srcPalette.blueShift;
122 } else {
123 RGB rgb = srcPalette.getRGB(srcPixel);
124 srcRed = rgb.red;
125 srcGreen = rgb.green;
126 srcBlue = rgb.blue;
127 }
128 int dstRed, dstGreen, dstBlue, dstAlpha;
129 if (srcAlpha is 255) {
130 dstRed = srcRed;
131 dstGreen = srcGreen;
132 dstBlue= srcBlue;
133 dstAlpha = srcAlpha;
134 } else {
135 int dstPixel = dst.getPixel(dstX, dstY);
136 dstAlpha = dst.getAlpha(dstX, dstY);
137 dstRed = (dstPixel & 0xFF) >>> 0;
138 dstGreen = (dstPixel & 0xFF00) >>> 8;
139 dstBlue = (dstPixel & 0xFF0000) >>> 16;
140 dstRed += (srcRed - dstRed) * srcAlpha / 255;
141 dstGreen += (srcGreen - dstGreen) * srcAlpha / 255;
142 dstBlue += (srcBlue - dstBlue) * srcAlpha / 255;
143 dstAlpha += (srcAlpha - dstAlpha) * srcAlpha / 255;
144 }
145 dst.setPixel(dstX, dstY, ((dstRed & 0xFF) << 0) | ((dstGreen & 0xFF) << 8) | ((dstBlue & 0xFF) << 16));
146 dst.setAlpha(dstX, dstY, dstAlpha);
147 }
148 }
149 }
150
151 /*
152 * (non-Javadoc) Method declared on ImageDesciptor.
153 */
154 public override ImageData getImageData() {
155 Point size = getSize();
156
157 /* Create a 24 bit image data with alpha channel */
158 imageData = new ImageData(size.x, size.y, 24, new PaletteData(0xFF, 0xFF00, 0xFF0000));
159 imageData.alphaData = new byte[imageData.width * imageData.height];
160
161 drawCompositeImage(size.x, size.y);
162
163 /* Detect minimum transparency */
164 bool transparency = false;
165 byte[] alphaData = imageData.alphaData;
166 for (int i = 0; i < alphaData.length; i++) {
167 int alpha = alphaData[i] & 0xFF;
168 if (!(alpha is 0 || alpha is 255)) {
169 /* Full alpha channel transparency */
170 return imageData;
171 }
172 if (!transparency && alpha is 0) transparency = true;
173 }
174 if (transparency) {
175 /* Reduce to 1-bit alpha channel transparency */
176 PaletteData palette = new PaletteData([new RGB(0, 0, 0), new RGB(255, 255, 255)]);
177 ImageData mask = new ImageData(imageData.width, imageData.height, 1, palette);
178 for (int y = 0; y < mask.height; y++) {
179 for (int x = 0; x < mask.width; x++) {
180 mask.setPixel(x, y, imageData.getAlpha(x, y) is 255 ? 1 : 0);
181 }
182 }
183 } else {
184 /* no transparency */
185 imageData.alphaData = null;
186 }
187 return imageData;
188 }
189
190
191 /**
192 * Return the transparent pixel for the receiver.
193 * <strong>NOTE</strong> This value is not currently in use in the
194 * default implementation.
195 * @return int
196 * @since 3.3
197 */
198 protected int getTransparentPixel() {
199 return 0;
200 }
201
202 /**
203 * Return the size of this composite image.
204 * <p>
205 * Subclasses must implement this framework method.
206 * </p>
207 *
208 * @return the x and y size of the image expressed as a point object
209 */
210 protected abstract Point getSize();
211
212 /**
213 * @param imageData The imageData to set.
214 * @since 3.3
215 */
216 protected void setImageData(ImageData imageData) {
217 this.imageData = imageData;
218 }
219 }