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1 <HTML>
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2 <HEAD>
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3 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
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4 <TITLE>JBuilder Project ScaleServlet2.jpx</TITLE>
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5 </HEAD>
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6 <BODY>
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7 <H1>Scaler</H1>
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8
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9 <p>A Servlet for scaling images.</p>
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10
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11 <p>Scaler takes parameters in the http request format:
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12 <code>Scaler/request_path/?param1=value1¶m2=value2&...</code></p>
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13
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14 <p>Recognised parameters:
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15 <ul>
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16 <li><b>request_path</b> path to file or directory.
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17
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18 <li><b>fn</b> path to file or directory below <code>/docuserver/images</code>.
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19 This path will be added to the <code>request_path</code> behind the servlet name.
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20 Either parameter can be empty.
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21
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22 <li><b>pn</b> page number. Index into the (alphabetically sorted) directory
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23 given by the path. Starts with 1. Ignored if the path points to a file.
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24 Default: 1.
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25
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26 <li><b>dw</b> destination image width (pixels).
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27 <li><b>dh</b> destination image height.
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28
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29 <li><b>wx</b> relative x offset of the image area to be sent (0 <= wx <= 1).
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30 Default: 0.
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31 <li><b>wy</b> relative y offset of the image area to be sent.
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32 Default: 0.
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33 <li><b>ww</b> relative width of the image area to be sent.
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34 Default: 1.
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35 <li><b>wh</b> relative height of the image area to be sent.
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36 Default: 1.
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37
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38 <li><b>ws</b> additional scaling factor. The resulting image will have the size
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39 <code>[ws*dw,ws*dh]</code>. Default: 1.
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40
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41 <li><b>mo</b> flags for the mode of operation separated by "+".
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42 <ul>
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43 <li><b>fit</b>: always scale the image to fit <code>[dw,dh]</code>.<br>
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44 <b>file</b>: send the file as-is (may be very large and all sorts of image types!).<br>
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45 If none of these flags is set heuristics is used (send unzoomed GIF as-is).
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46
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47 <li><b>errtxt</b>: send error response as HTML.<br>
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48 <b>errimg</b>: response as image (default).
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49
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50 <li><b>q0</b>-<b>q2</b>: quality of interpolation in scaling
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51 (<code>q0</code>: worst, default).
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52
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53 <li><b>lores</b>: try to use scaled image (default)<br>
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54 <b>hires</b>: always use unscaled image.<br>
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55 If the image is zoomed (ww, wh < 1) the unscaled image is used in any case.
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56 </ul>
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57
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58 </ul>
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59 The image will be scaled equally in horizontal and vertical direction such that
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60 the resulting image does not exceed the rectangle <code>[ww,wh]</code>.
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61 </p>
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62
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63 </BODY>
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64 </HTML>
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