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annotate dwtx/draw2d/ImageUtilities.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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98
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1 /*******************************************************************************
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2 * Copyright (c) 2003, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.draw2d.ImageUtilities;
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14
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15 import dwt.dwthelper.utils;
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16
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17
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18 static import dwt.graphics.Rectangle;
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19 import dwt.DWT;
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20 import dwt.graphics.Color;
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21 import dwt.graphics.Font;
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22 import dwt.graphics.FontMetrics;
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23 import dwt.graphics.GC;
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24 import dwt.graphics.Image;
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25 import dwt.graphics.ImageData;
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26 import dwt.graphics.PaletteData;
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27 import dwt.graphics.RGB;
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28 import dwt.widgets.Display;
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29 import dwtx.draw2d.geometry.Dimension;
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30 import dwtx.draw2d.FigureUtilities;
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31
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32 /**
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33 * @author Pratik Shah
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34 * @since 3.0
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35 */
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36 public class ImageUtilities {
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37
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38 /**
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39 * Returns a new Image with the given String rotated left (by 90 degrees). The String
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40 * will be rendered using the provided colors and fonts. The client is responsible for
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41 * disposing the returned Image. Strings cannot contain newline or tab characters. This
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42 * method MUST be invoked from the user-interface (Display) thread.
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43 *
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44 * @param string the String to be rendered
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45 * @param font the font
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46 * @param foreground the text's color
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47 * @param background the background color
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48 * @return an Image which must be disposed
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49 */
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50 public static Image createRotatedImageOfString(String string, Font font,
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51 Color foreground, Color background) {
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52 Display display = Display.getCurrent();
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53 if (display is null)
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54 DWT.error(DWT.ERROR_THREAD_INVALID_ACCESS);
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55
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56 FontMetrics metrics = FigureUtilities.getFontMetrics(font);
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57 Dimension strSize = FigureUtilities.getStringExtents(string, font);
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58 Image srcImage = new Image(display, strSize.width, metrics.getAscent());
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59 GC gc = new GC(srcImage);
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60 gc.setFont(font);
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61 gc.setForeground(foreground);
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62 gc.setBackground(background);
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63 gc.fillRectangle(srcImage.getBounds());
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64 gc.drawString(string, 0, 0 - metrics.getLeading());
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65 Image result = createRotatedImage(srcImage);
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66 gc.dispose();
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67 srcImage.dispose();
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68 return result;
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69 }
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70
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71 /**
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72 * Returns a new Image that is the given Image rotated left by 90 degrees. The client is
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73 * responsible for disposing the returned Image. This method MUST be invoked from the
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74 * user-interface (Display) thread.
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75 *
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76 * @param srcImage the Image that is to be rotated left
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77 * @return the rotated Image (the client is responsible for disposing it)
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78 */
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79 public static Image createRotatedImage(Image srcImage) {
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80 Display display = Display.getCurrent();
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81 if (display is null)
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82 DWT.error(DWT.ERROR_THREAD_INVALID_ACCESS);
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83
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84 ImageData srcData = srcImage.getImageData();
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85 ImageData destData;
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86 if (srcData.depth < 8)
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87 destData = rotatePixelByPixel(srcData);
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88 else
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89 destData = rotateOptimized(srcData);
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90
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91 return new Image(display, destData);
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92 }
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93
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94 /**
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95 * Creates an ImageData representing the given <code>Image</code> shaded with the given
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96 * <code>Color</code>.
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97 *
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98 * @param fromImage Image that has to be shaded
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99 * @param shade The Color to be used for shading
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100 * @return A new ImageData that can be used to create an Image.
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101 */
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102 public static ImageData createShadedImage(Image fromImage, Color shade) {
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103 dwt.graphics.Rectangle.Rectangle r = fromImage.getBounds();
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104 ImageData data = fromImage.getImageData();
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105 PaletteData palette = data.palette;
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106 if (!palette.isDirect) {
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107 /* Convert the palette entries */
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108 RGB [] rgbs = palette.getRGBs();
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109 for (int i = 0; i < rgbs.length; i++) {
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110 if (data.transparentPixel !is i) {
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111 RGB color = rgbs [i];
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112 color.red = determineShading(color.red, shade.getRed());
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113 color.blue = determineShading(color.blue, shade.getBlue());
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114 color.green = determineShading(color.green, shade.getGreen());
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115 }
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116 }
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117 data.palette = new PaletteData(rgbs);
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118 } else {
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119 /* Convert the pixels. */
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120 int[] scanline = new int[r.width];
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121 int redMask = palette.redMask;
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122 int greenMask = palette.greenMask;
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123 int blueMask = palette.blueMask;
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124 int redShift = palette.redShift;
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125 int greenShift = palette.greenShift;
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126 int blueShift = palette.blueShift;
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127 for (int y = 0; y < r.height; y++) {
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128 data.getPixels(0, y, r.width, scanline, 0);
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129 for (int x = 0; x < r.width; x++) {
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130 int pixel = scanline[x];
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131 int red = pixel & redMask;
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132 red = (redShift < 0) ? red >>> -redShift : red << redShift;
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133 int green = pixel & greenMask;
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134 green = (greenShift < 0) ? green >>> -greenShift : green << greenShift;
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135 int blue = pixel & blueMask;
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136 blue = (blueShift < 0) ? blue >>> -blueShift : blue << blueShift;
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137 red = determineShading(red, shade.getRed());
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138 blue = determineShading(blue, shade.getBlue());
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139 green = determineShading(green, shade.getGreen());
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140 red = (redShift < 0) ? red << -redShift : red >> redShift;
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141 red &= redMask;
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142 green = (greenShift < 0) ? green << -greenShift : green >> greenShift;
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143 green &= greenMask;
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144 blue = (blueShift < 0) ? blue << -blueShift : blue >> blueShift;
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145 blue &= blueMask;
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146 scanline[x] = red | blue | green;
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147 }
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148 data.setPixels(0, y, r.width, scanline, 0);
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149 }
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150 }
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151 return data;
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152 }
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153
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154 private static int determineShading(int origColor, int shadeColor) {
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155 return (origColor + shadeColor) / 2;
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156 }
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157
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158 private static ImageData rotateOptimized(ImageData srcData) {
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159 int bytesPerPixel = Math.max(1, srcData.depth / 8);
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160 int destBytesPerLine = ((srcData.height * bytesPerPixel - 1) / srcData.scanlinePad + 1)
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161 * srcData.scanlinePad;
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162 byte[] newData = new byte[destBytesPerLine * srcData.width];
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163 for (int srcY = 0; srcY < srcData.height; srcY++) {
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164 for (int srcX = 0; srcX < srcData.width; srcX++) {
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165 int destX = srcY;
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166 int destY = srcData.width - srcX - 1;
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167 int destIndex = (destY * destBytesPerLine) + (destX * bytesPerPixel);
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168 int srcIndex = (srcY * srcData.bytesPerLine) + (srcX * bytesPerPixel);
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169 System.arraycopy(srcData.data, srcIndex, newData, destIndex, bytesPerPixel);
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170 }
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171 }
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172 return new ImageData(srcData.height, srcData.width, srcData.depth, srcData.palette,
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173 srcData.scanlinePad, newData);
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174 }
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175
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176 private static ImageData rotatePixelByPixel(ImageData srcData) {
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177 ImageData destData = new ImageData(srcData.height, srcData.width, srcData.depth,
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178 srcData.palette);
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179 for (int y = 0; y < srcData.height; y++) {
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180 for (int x = 0; x < srcData.width; x++) {
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181 destData.setPixel(y, srcData.width - x - 1, srcData.getPixel(x, y));
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182 }
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183 }
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184 return destData;
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185 }
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186
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187 }