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4 <TITLE>Scaler servlet</TITLE>
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6 <BODY>
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7 <H1>Scaler</H1>
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9 <p>A Servlet for scaling images. (Version 1.6b)</p>
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10
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11 <h2>Web API</h2>
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12
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13 <p>The Scaler servlet takes parameters in the http request format:
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14 <code>Scaler/request_path/?param1=value1¶m2=value2&...</code>
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15 Unknown parameters will be silently ignored.</p>
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16
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17 <p>Recognised parameters:
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18 <ul>
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19 <li><b>request_path</b> path to file or directory.</li>
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20
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21 <li><b>fn</b> path to file or directory below <code>/docuserver/images</code>
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22 (or other configured image directory).
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23 This path will be added to the <code>request_path</code> behind the servlet name.
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24 Either parameter can be empty.</li>
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25
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26 <li><b>pn</b> page number. Index into the (alphabetically sorted) directory
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27 given by the path. Starts with 1. Ignored if the path points to a file.
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28 Default: 1.</li>
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29
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30 <li><b>dw</b> destination image width (pixels).</li>
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31
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32 <li><b>dh</b> destination image height (pixels).</li>
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33
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34 <li><b>wx</b> relative x offset of the image area to be sent (0 <= wx <= 1).
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35 Default: 0.</li>
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36
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37 <li><b>wy</b> relative y offset of the image area to be sent (0 <= wy <= 1).
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38 Default: 0.</li>
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39
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40 <li><b>ww</b> relative width of the image area to be sent (0 <= ww <= 1).
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41 Default: 1.</li>
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42
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43 <li><b>wh</b> relative height of the image area to be sent (0 <= wh <= 1).
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44 Default: 1.</li>
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45
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46 <li><b>ws</b> additional scaling factor. The resulting image will have the size
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47 <code>[ws*dw,ws*dh]</code>. Default: 1.</li>
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48
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49 <li><b>mo</b> flags for the mode of operation separated by "+".
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50 <ul>
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51 <li><b>fit</b>: always scale the image to fit
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52 <code>[dw,dh]</code>.<br> <b>file</b>: send the file as-is (may
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53 be very large and all sorts of image types!). If configuration
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54 doesn't allow sending files
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55 (<code>sendfile-allowed=false</code>) revert to
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56 <code>clip</code>.<br> <b>clip</b>: send the file in its
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57 original resolution, cropped to fit <code>[dw,dh]</code>.<br> If
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58 none of these flags is set heuristics is used (send unzoomed GIF
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59 as-is).</li>
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61 <li><b>errtxt</b>: send error response as HTML.<br>
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62 <b>errimg</b>: response as image (default).</li>
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63
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64 <li><b>q0</b>-<b>q2</b>: quality of interpolation in scaling
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65 (<code>q0</code>: worst, default).</li>
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66
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67 <li><b>lores</b>: try to use scaled image (default)<br>
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68 <b>hires</b>: always use unscaled image.<br>
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69 If the image is zoomed (ww, wh < 1) the unscaled image is
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70 used in any case.</li>
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71
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72 <li><b>vmir</b>: mirror image vertically.<br>
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73 <b>hmir</b>: mirror image horizontally.</li>
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74 </ul>
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75 </li>
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77 <li><b>cont</b>: change contrast of the image. Negative value
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78 reduces contrast, positive value enhances contrast. Pixel value is
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79 multiplied by 2^cont. Default: 0</li>
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81 <li><b>brgt</b>: change brightness of image. Negative value reduces
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82 brightness, positive value enhances brightness. Pixel value is added
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83 brgt. Default: 0</li>
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85 <li><b>rot</b>: rotate image. Rotation angle is given in degrees. Default: 0</li>
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86
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87 </ul>
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88 The image will be scaled equally in horizontal and vertical direction such that
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89 the resulting image does not exceed the rectangle <code>[ww,wh]</code>.
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90 </p>
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92 </BODY>
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93 </HTML>
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