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<!DOCTYPE html>  <html> <head>   <title>curves.coffee</title>   <meta http-equiv="content-type" content="text/html; charset=UTF-8">   <link rel="stylesheet" media="all" href="docco.css" /> </head> <body>   <div id="container">     <div id="background"></div>            <div id="jump_to">         Jump To &hellip;         <div id="jump_wrapper">           <div id="jump_page">                                           <a class="source" href="blackwhite.html">                 blackwhite.coffee               </a>                                           <a class="source" href="brightnesscontrast.html">                 brightnesscontrast.coffee               </a>                                           <a class="source" href="colorbalance.html">                 colorbalance.coffee               </a>                                           <a class="source" href="curves.html">                 curves.coffee               </a>                                           <a class="source" 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class="pilwrap">                 <a class="pilcrow" href="#section-1">&#182;</a>               </div>                            </td>             <td class="code">               <div class="highlight"><pre><span class="k">class</span> <span class="nx">PSDCurves</span>
  <span class="nv">constructor: </span><span class="nf">(@layer, @length) -&gt;</span>
    <span class="vi">@file = </span><span class="nx">@layer</span><span class="p">.</span><span class="nx">file</span>
    <span class="vi">@data =</span>
      <span class="nv">curve: </span><span class="p">[]</span>

  <span class="nv">parse: </span><span class="o">-&gt;</span>
    <span class="nv">start = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">tell</span><span class="p">()</span></pre></div>             </td>           </tr>                               <tr id="section-2">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-2">&#182;</a>               </div>               <p>Data padding. Docs are wrong. Maybe Photoshop is wrong.
I don't know what's right anymore.</p>             </td>             <td class="code">               <div class="highlight"><pre>    <span class="nx">@file</span><span class="p">.</span><span class="nx">seek</span> <span class="mi">1</span>

    <span class="nv">version = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readShortInt</span><span class="p">()</span>
    <span class="nx">assert</span> <span class="nx">version</span> <span class="k">in</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">4</span><span class="p">]</span>

    <span class="nv">tag = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readInt</span><span class="p">()</span>
    <span class="vi">@data.curveCount = </span><span class="mi">0</span>
    <span class="k">for</span> <span class="nx">i</span> <span class="k">in</span> <span class="p">[</span><span class="mi">0</span><span class="p">...</span><span class="mi">32</span><span class="p">]</span></pre></div>             </td>           </tr>                               <tr id="section-3">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-3">&#182;</a>               </div>               <p>Count of the curves in the file</p>             </td>             <td class="code">               <div class="highlight"><pre>      <span class="nx">@data</span><span class="p">.</span><span class="nx">curveCount</span><span class="o">++</span> <span class="k">if</span> <span class="nx">tag</span> <span class="o">&amp;</span> <span class="p">(</span><span class="mi">1</span> <span class="o">&lt;&lt;</span> <span class="nx">i</span><span class="p">)</span>

    <span class="k">for</span> <span class="nx">i</span> <span class="k">in</span> <span class="p">[</span><span class="mi">0</span><span class="p">...</span><span class="nx">@data</span><span class="p">.</span><span class="nx">curveCount</span><span class="p">]</span>
      <span class="nv">count = </span><span class="mi">0</span>
      <span class="k">for</span> <span class="nx">j</span> <span class="k">in</span> <span class="p">[</span><span class="mi">0</span><span class="p">...</span><span class="mi">32</span><span class="p">]</span>
        <span class="k">if</span> <span class="nx">tag</span> <span class="o">&amp;</span> <span class="p">(</span><span class="mi">1</span> <span class="o">&lt;&lt;</span> <span class="nx">j</span><span class="p">)</span>
          <span class="k">if</span> <span class="nx">count</span> <span class="o">is</span> <span class="nx">i</span>
            <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">]</span> <span class="o">=</span> <span class="nv">channelIndex: </span><span class="nx">j</span>
            <span class="k">break</span>

          <span class="nx">count</span><span class="o">++</span>

      <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nv">pointCount = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">getShortInt</span><span class="p">()</span>
      <span class="nx">assert</span> <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">pointCount</span> <span class="o">&gt;=</span> <span class="mi">2</span>
      <span class="nx">assert</span> <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">pointCount</span> <span class="o">&lt;=</span> <span class="mi">19</span>

      <span class="k">for</span> <span class="nx">j</span> <span class="k">in</span> <span class="p">[</span><span class="mi">0</span><span class="p">...</span><span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">pointCount</span><span class="p">]</span></pre></div>             </td>           </tr>                               <tr id="section-4">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-4">&#182;</a>               </div>               <p>Curve points. Each point is a pair of short ints where the
first number is the output value and the second is the input.</p>             </td>             <td class="code">               <div class="highlight"><pre>        <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">outputValue</span><span class="p">[</span><span class="nx">j</span><span class="p">]</span> <span class="o">=</span> <span class="nx">@file</span><span class="p">.</span><span class="nx">readShortInt</span><span class="p">()</span>
        <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">inputValue</span><span class="p">[</span><span class="nx">j</span><span class="p">]</span> <span class="o">=</span> <span class="nx">@file</span><span class="p">.</span><span class="nx">readShortInt</span><span class="p">()</span>

        <span class="nx">assert</span> <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">outputValue</span><span class="p">[</span><span class="nx">j</span><span class="p">]</span> <span class="o">&gt;=</span> <span class="mi">0</span>
        <span class="nx">assert</span> <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">outputValue</span><span class="p">[</span><span class="nx">j</span><span class="p">]</span> <span class="o">&lt;=</span> <span class="mi">255</span>
        <span class="nx">assert</span> <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">inputValue</span><span class="p">[</span><span class="nx">j</span><span class="p">]</span> <span class="o">&gt;=</span> <span class="mi">0</span>
        <span class="nx">assert</span> <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">inputValue</span><span class="p">[</span><span class="nx">j</span><span class="p">]</span> <span class="o">&lt;=</span> <span class="mi">255</span></pre></div>             </td>           </tr>                               <tr id="section-5">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-5">&#182;</a>               </div>               <p>If this is true, we have some additional information to parse.</p>             </td>             <td class="code">               <div class="highlight"><pre>    <span class="k">if</span> <span class="nx">@file</span><span class="p">.</span><span class="nx">tell</span><span class="p">()</span> <span class="o">-</span> <span class="nx">start</span> <span class="o">&lt;</span> <span class="nx">@length</span> <span class="o">-</span> <span class="mi">4</span>
      <span class="nv">tag = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readString</span> <span class="mi">4</span>
      <span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span> <span class="nx">tag</span><span class="p">,</span> <span class="s1">&#39;Crv &#39;</span>

      <span class="nv">version = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readShortInt</span><span class="p">()</span>
      <span class="nx">assert</span> <span class="nx">version</span> <span class="o">is</span> <span class="mi">4</span>

      <span class="nv">curveCount = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readInt</span><span class="p">()</span>
      <span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span> <span class="nx">curveCount</span><span class="p">,</span> <span class="nx">@data</span><span class="p">.</span><span class="nx">curveCount</span>

      <span class="k">for</span> <span class="nx">i</span> <span class="k">in</span> <span class="p">[</span><span class="mi">0</span><span class="p">...</span><span class="nx">@data</span><span class="p">.</span><span class="nx">curveCount</span><span class="p">]</span>
        <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nv">channelIndex = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readShortInt</span><span class="p">()</span>
        <span class="nv">pointCount = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readShortInt</span><span class="p">()</span>
        <span class="nx">assert</span> <span class="nx">pointCount</span> <span class="o">is</span> <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">pointCount</span>

        <span class="k">for</span> <span class="nx">j</span> <span class="k">in</span> <span class="p">[</span><span class="mi">0</span><span class="p">...</span><span class="nx">pointCount</span><span class="p">]</span>
          <span class="nv">outputValue = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">getShortInt</span><span class="p">()</span>
          <span class="nv">inputValue = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">getShortInt</span><span class="p">()</span>
          <span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span> <span class="nx">outputValue</span><span class="p">,</span> <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">outputValue</span><span class="p">[</span><span class="nx">j</span><span class="p">]</span>
          <span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span> <span class="nx">inputValue</span><span class="p">,</span> <span class="nx">@data</span><span class="p">.</span><span class="nx">curve</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">inputValue</span><span class="p">[</span><span class="nx">j</span><span class="p">]</span></pre></div>             </td>           </tr>                               <tr id="section-6">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-6">&#182;</a>               </div>               <p>Only returned the parsed data</p>             </td>             <td class="code">               <div class="highlight"><pre>    <span class="nx">@data</span>

</pre></div>             </td>           </tr>                </tbody>     </table>   </div> </body> </html>