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annotate servlet/src/digilib/image/DocuImage.java @ 470:16bd70715ac3

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Improved performance of JAIDocuImage for large images - simulated subsampling by scaling
author robcast
date Wed, 15 Feb 2006 00:09:50 +0100
parents d76a9e3f1ec9
children e758a49258e8
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1 /* DocuImage -- General image interface class
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2
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3 Digital Image Library servlet components
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4
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5 Copyright (C) 2001, 2002, 2003 Robert Casties (robcast@mail.berlios.de)
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6
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7 This program is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2 of the License, or (at your
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10 option) any later version.
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11
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12 Please read license.txt for the full details. A copy of the GPL
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13 may be found at http://www.gnu.org/copyleft/lgpl.html
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 */
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20
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21 package digilib.image;
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22
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23 import java.awt.Rectangle;
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24 import java.io.IOException;
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25 import java.io.OutputStream;
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26 import java.util.Iterator;
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27
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28 import digilib.io.ImageFile;
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29 import digilib.io.FileOpException;
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30
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31 /** The basic class for the representation of a digilib image.
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32 *
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33 * The actual image object is hidden in the class, only methods for loading,
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34 * manipulation, and saving are exported. This strategy enables implementations
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35 * using different toolkits that rely on different image base classes (like
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36 * JIMI, Java2D and JAI).
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37 */
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38 public interface DocuImage {
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39
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40 /** Loads an image file into the Object.
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41 *
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42 * @param f Image File.
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43 * @throws FileOpException Exception thrown if any error occurs.
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44 */
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45 public void loadImage(ImageFile f) throws FileOpException;
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46
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47 /** This DocuImage support the loadSubImage operation.
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48 *
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49 * @return boolean
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50 */
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51 public boolean isSubimageSupported();
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52
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53 /** Load only a subsampled region of the image file.
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54 *
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55 * @param f
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56 * @param region
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57 * @param subsample
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58 * @throws FileOpException
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59 */
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60 public void loadSubimage(ImageFile f, Rectangle region, int subsample)
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61 throws FileOpException;
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62
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63 /** Writes the current image to a ServletResponse.
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64 *
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65 * The image is encoded to the mime-type <code>mt</code> and sent to the output
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66 * stream of the <code>ServletResponse</code> <code>res</code>.
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67 *
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68 * Currently only mime-types "image/jpeg" and "image/png" are supported.
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69 *
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70 * @param mt mime-type of the image to be sent.
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71 * @param res ServletResponse where the image is sent.
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72 * @throws FileOpException Exception thrown on any error.
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73 */
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74 public void writeImage(String mt, OutputStream ostream)
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75 throws FileOpException;
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76
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77 /** The width of the current image in pixel.
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78 *
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79 * @return Image width in pixels.
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80 */
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81 public int getWidth();
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82
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83 /** The height of the current image in pixel.
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84 *
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85 * @return Image height in pixels.
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86 */
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87 public int getHeight();
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88
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89 /** The mime-type of the current image.
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90 *
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91 * @return String the mime-type of this image.
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92 */
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93 public String getMimetype();
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94
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95 /** Crops the current image.
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96 *
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97 * Cuts out a region of the size <code>width</code> x <code>height</code> at
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98 * the offset <code>xoff</code>, <code>yoff</code> from the current image
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99 * and replaces the current image with the result.
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100 *
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101 * @param xoff X offset of crop region
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102 * @param yoff Y offset of crop region
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103 * @param width width of crop region
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104 * @param height height of crop region
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105 * @throws ImageOpException
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106 */
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107 public void crop(int xoff, int yoff, int width, int height)
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108 throws ImageOpException;
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109
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110 /** Scales the current image.
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111 *
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112 * Replaces the current image with an image scaled by the factor
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113 * <code>scale</code>.
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114 *
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115 * @param scale scaling factor
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116 * @throws ImageOpException
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117 */
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118 public void scale(double scaleX, double scaleY) throws ImageOpException;
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119
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120 /** Crops and scales the current image.
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121 *
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122 * The current image is cropped to a rectangle of <code>width</code>,
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123 * <code>height</code> at position <code>x_off</code>, <code>y_off</code>. The
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124 * resulting image is scaled by the factor <code>scale</code> using the
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125 * interpolation quality <code>qual</code> (0=worst).
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126 *
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127 * @param x_off x offset of the crop rectangle in pixel.
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128 * @param y_off y offset of the crop rectangle in pixel.
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129 * @param width width of the crop rectangle in pixel.
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130 * @param height height of the crop rectangle in pixel.
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131 * @param scale scaling factor.
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132 * @param qual interpolation quality (0=worst).
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133 * @throws ImageOpException exception thrown on any error.
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134 */
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135 public void cropAndScale(
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136 int x_off,
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137 int y_off,
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138 int width,
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139 int height,
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140 double scale,
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141 int qual)
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142 throws ImageOpException;
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143
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144 /** Rotates the current image.
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145 *
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146 * Replaces the current image with a rotated image. The image is rotated
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147 * around the center by the <code>angle</code>
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148 * given in degrees [0, 360] clockwise.
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149 * Image size and aspect ratio are likely to change.
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150 *
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151 * @param angle rotation angle in degree
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152 */
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153 public void rotate(double angle) throws ImageOpException;
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154
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155 /** Mirrors the current image.
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156 *
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157 * Replaces the current image with a mirrored image. The mirror axis goes
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158 * through the center of the image and is rotated by <code>angle</code>
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159 * degrees. Currently only horizontal and vertical mirroring (0 and 90
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160 * degree) are supported.
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161 *
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162 * @param angle angle of mirror axis
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163 * @throws ImageOpException
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164 */
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165 public void mirror(double angle) throws ImageOpException;
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166
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167 /** Enhances brightness and contrast of the current image.
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168 *
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169 * Replaces the current image with a brightness and contrast enhanced image.
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170 * Contrast is enhanced by multiplying the pixel value with the constant
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171 * <code>mult</code>. Brightness is enhanced by adding the constant
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172 * <code>add</code> to the pixel value. Operation: p1 = (p0*mult)+add.
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173 *
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174 * @param mult multiplicative constant for contrast enhancement
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175 * @param add additive constant for brightness enhancement
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176 * @throws ImageOpException
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177 */
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178 public void enhance(float mult, float add) throws ImageOpException;
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180 /** Manipulates the colors of the current image.
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181 *
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182 * Replaces the current image with a color modified image.
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183 * For the red, green and blue color channels all pixel values are multiplied
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184 * by the constant
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185 * <code>m</code> and added to the constant
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186 * <code>a</code>. Operation: p1 = (p0*m)+a.
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187 *
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188 * @param rgbm multiplicative constants for red, green, blue
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189 * @param rgba additive constant for red, green, blue
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190 * @throws ImageOpException
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191 */
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192 public void enhanceRGB(float[] rgbm, float[] rgba)
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193 throws ImageOpException;
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194
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195 /**
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196 * Returns the interpolation quality.
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197 * @return int
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198 */
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199 public int getQuality();
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200
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201 /**
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202 * Sets the interpolation quality.
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203 * @param quality The quality to set
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204 */
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205 public void setQuality(int quality);
207
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206
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207 /** Frees all resources bound to the DocuImage.
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208 *
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209 * Things that should be freed are image objects and open files.
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210 *
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211 */
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212 public void dispose();
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213
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214 /**
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215 * Check image size and type and store in ImageFile f
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216 */
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217 public boolean identify(ImageFile imgf) throws IOException;
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218
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219 /**
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220 * Returns a list of supported image formats
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221 */
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222 public Iterator getSupportedFormats();
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223
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224 }