1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.tools;
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3 |
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4 | import java.awt.Dimension;
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5 | import java.awt.Image;
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6 | import java.awt.image.BufferedImage;
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7 | import java.util.HashMap;
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8 | import java.util.Map;
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9 |
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10 | import javax.swing.ImageIcon;
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11 |
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12 | import com.kitfox.svg.SVGDiagram;
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13 |
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14 | /**
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15 | * Holds data for one particular image.
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16 | * It can be backed by a svg or raster image.
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17 | *
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18 | * In the first case, 'svg' is not null and in the latter case, 'imgCache' has
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19 | * at least one entry for the key DEFAULT_DIMENSION.
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20 | * @since 4271
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21 | */
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22 | class ImageResource {
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23 |
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24 | /**
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25 | * Caches the image data for resized versions of the same image.
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26 | */
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27 | private Map<Dimension, Image> imgCache = new HashMap<Dimension, Image>();
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28 | private SVGDiagram svg;
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29 | public static final Dimension DEFAULT_DIMENSION = new Dimension(-1, -1);
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30 |
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31 | public ImageResource(Image img) {
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32 | CheckParameterUtil.ensureParameterNotNull(img);
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33 | imgCache.put(DEFAULT_DIMENSION, img);
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34 | }
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35 |
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36 | public ImageResource(SVGDiagram svg) {
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37 | CheckParameterUtil.ensureParameterNotNull(svg);
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38 | this.svg = svg;
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39 | }
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40 |
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41 | public ImageIcon getImageIcon() {
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42 | return getImageIcon(DEFAULT_DIMENSION);
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43 | }
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44 |
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45 | /**
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46 | * Get an ImageIcon object for the image of this resource
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47 | * @param dim The requested dimensions. Use (-1,-1) for the original size
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48 | * and (width, -1) to set the width, but otherwise scale the image
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49 | * proportionally.
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50 | * @return ImageIcon object for the image of this resource, scaled according to dim
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51 | */
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52 | public ImageIcon getImageIcon(Dimension dim) {
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53 | if (dim.width < -1 || dim.width == 0 || dim.height < -1 || dim.height == 0)
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54 | throw new IllegalArgumentException();
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55 | Image img = imgCache.get(dim);
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56 | if (img != null) {
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57 | return new ImageIcon(img);
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58 | }
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59 | if (svg != null) {
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60 | img = ImageProvider.createImageFromSvg(svg, dim);
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61 | if (img == null) {
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62 | return null;
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63 | }
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64 | imgCache.put(dim, img);
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65 | return new ImageIcon(img);
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66 | } else {
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67 | Image base = imgCache.get(DEFAULT_DIMENSION);
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68 | if (base == null) throw new AssertionError();
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69 |
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70 | int width = dim.width;
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71 | int height = dim.height;
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72 | ImageIcon icon = new ImageIcon(base);
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73 | if (width == -1) {
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74 | width = Math.max(1, icon.getIconWidth() * height / icon.getIconHeight());
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75 | } else if (height == -1) {
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76 | height = Math.max(1, icon.getIconHeight() * width / icon.getIconWidth());
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77 | }
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78 | Image i = icon.getImage().getScaledInstance(width, height, Image.SCALE_SMOOTH);
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79 | img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
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80 | img.getGraphics().drawImage(i, 0, 0, null);
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81 | imgCache.put(dim, img);
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82 | return new ImageIcon(img);
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83 | }
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84 | }
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85 |
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86 | /**
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87 | * Get image icon with a certain maximum size. The image is scaled down
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88 | * to fit maximum dimensions. (Keeps aspect ratio)
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89 | *
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90 | * @param maxSize The maximum size. One of the dimensions (widht or height) can be -1,
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91 | * which means it is not bounded.
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92 | * @return ImageIcon object for the image of this resource, scaled down if needed, according to maxSize
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93 | */
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94 | public ImageIcon getImageIconBounded(Dimension maxSize) {
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95 | if (maxSize.width < -1 || maxSize.width == 0 || maxSize.height < -1 || maxSize.height == 0)
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96 | throw new IllegalArgumentException();
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97 | float realWidth;
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98 | float realHeight;
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99 | if (svg != null) {
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100 | realWidth = svg.getWidth();
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101 | realHeight = svg.getHeight();
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102 | } else {
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103 | Image base = imgCache.get(DEFAULT_DIMENSION);
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104 | if (base == null) throw new AssertionError();
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105 | ImageIcon icon = new ImageIcon(base);
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106 | realWidth = icon.getIconWidth();
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107 | realHeight = icon.getIconHeight();
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108 | }
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109 | int maxWidth = maxSize.width;
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110 | int maxHeight = maxSize.height;
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111 |
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112 | if (realWidth <= maxWidth) {
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113 | maxWidth = -1;
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114 | }
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115 | if (realHeight <= maxHeight) {
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116 | maxHeight = -1;
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117 | }
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118 |
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119 | if (maxWidth == -1 && maxHeight == -1)
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120 | return getImageIcon(DEFAULT_DIMENSION);
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121 | else if (maxWidth == -1)
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122 | return getImageIcon(new Dimension(-1, maxHeight));
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123 | else if (maxHeight == -1)
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124 | return getImageIcon(new Dimension(maxWidth, -1));
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125 | else
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126 | if (realWidth / maxWidth > realHeight / maxHeight)
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127 | return getImageIcon(new Dimension(maxWidth, -1));
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128 | else
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129 | return getImageIcon(new Dimension(-1, maxHeight));
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130 | }
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131 | }
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