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<!DOCTYPE html> <html> <head> <title>levels.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 … <div id="jump_wrapper"> <div id="jump_page"> <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" href="huesaturation.html"> huesaturation.coffee </a> <a class="source" href="invert.html"> invert.coffee </a> <a class="source" href="layereffect.html"> layereffect.coffee </a> <a class="source" href="levels.html"> levels.coffee </a> <a class="source" href="posterize.html"> posterize.coffee </a> <a class="source" href="selectivecolor.html"> selectivecolor.coffee </a> <a class="source" href="threshold.html"> threshold.coffee </a> <a class="source" href="typetool.html"> typetool.coffee </a> <a class="source" href="log.html"> log.coffee </a> <a class="source" href="psd.html"> psd.coffee </a> <a class="source" href="psdassert.html"> psdassert.coffee </a> <a class="source" href="psdchannelimage.html"> psdchannelimage.coffee </a> <a class="source" href="psdcolor.html"> psdcolor.coffee </a> <a class="source" href="psddescriptor.html"> psddescriptor.coffee </a> <a class="source" href="psdfile.html"> psdfile.coffee </a> <a class="source" href="psdheader.html"> psdheader.coffee </a> <a class="source" href="psdimage.html"> psdimage.coffee </a> <a class="source" href="psdlayer.html"> psdlayer.coffee </a> <a class="source" href="psdlayermask.html"> psdlayermask.coffee </a> <a class="source" href="psdresource.html"> psdresource.coffee </a> <a class="source" href="util.html"> util.coffee </a> </div> </div> </div> <table cellpadding="0" cellspacing="0"> <thead> <tr> <th class="docs"> <h1> levels.coffee </h1> </th> <th class="code"> </th> </tr> </thead> <tbody> <tr id="section-1"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-1">¶</a> </div> </td> <td class="code"> <div class="highlight"><pre><span class="k">class</span> <span class="nx">PSDLevels</span>
<span class="nv">constructor: </span><span class="nf">(@layer, @length) -></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">records: </span><span class="p">[]</span>
<span class="nv">parse: </span><span class="o">-></span>
<span class="nv">start = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">tell</span><span class="p">()</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">1</span>
<span class="nx">@parseLevelRecords</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">¶</a> </div> <p>PS CS (8.0) additional information</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"><</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">readf</span> <span class="s2">">4s"</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="s2">"Lvls"</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="p">.</span><span class="nx">equal</span> <span class="nx">version</span><span class="p">,</span> <span class="mi">3</span></pre></div> </td> </tr> <tr id="section-3"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-3">¶</a> </div> <p>Figure out the total number of level record structures
Subtract the legacy number of level record structures (29)
to determine how many are remaining in the file for reading.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="vi">@data.levelCount = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readShortInt</span><span class="p">()</span> <span class="o">-</span> <span class="mi">29</span>
<span class="nx">assert</span> <span class="nx">levelCount</span> <span class="o">>=</span> <span class="mi">0</span>
<span class="nx">@parseLevelRecords</span><span class="p">(</span><span class="nx">levelCount</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">¶</a> </div> <p>Only return the important data. Don't need to hold on to this
entire class.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="k">return</span> <span class="nx">@data</span>
<span class="nv">parseLevelRecords: </span><span class="nf">(count = 29) -></span></pre></div> </td> </tr> <tr id="section-5"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-5">¶</a> </div> <p>29 sets of level records. each level has 5 short ints</p> </td> <td class="code"> <div class="highlight"><pre> <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">count</span><span class="p">]</span>
<span class="nv">record = </span><span class="p">{}</span>
<span class="p">[</span>
<span class="nx">record</span><span class="p">.</span><span class="nx">inputFloor</span><span class="p">,</span> <span class="c1"># (0...253)</span>
<span class="nx">record</span><span class="p">.</span><span class="nx">inputCeiling</span><span class="p">,</span> <span class="c1"># (2...255)</span>
<span class="nx">record</span><span class="p">.</span><span class="nx">outputFloor</span><span class="p">,</span> <span class="c1"># (0...255)</span>
<span class="nx">record</span><span class="p">.</span><span class="nx">outputCeiling</span><span class="p">,</span> <span class="c1"># (0...255)</span>
<span class="nx">record</span><span class="p">.</span><span class="nx">gamma</span> <span class="c1"># (10...999)</span>
<span class="p">]</span> <span class="o">=</span> <span class="nx">@file</span><span class="p">.</span><span class="nx">readf</span> <span class="s2">">hhhhh"</span>
<span class="nx">record</span><span class="p">.</span><span class="nx">gamma</span> <span class="err">/= 100</span></pre></div> </td> </tr> <tr id="section-6"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-6">¶</a> </div> <p>Sets 28 and 29 are reserved</p> </td> <td class="code"> <div class="highlight"><pre> <span class="k">if</span> <span class="nx">i</span> <span class="o"><</span> <span class="mi">27</span>
<span class="nx">assert</span> <span class="nx">record</span><span class="p">.</span><span class="nx">inputFloor</span> <span class="o">>=</span> <span class="mi">0</span> <span class="o">and</span> <span class="nx">record</span><span class="p">.</span><span class="nx">inputFloor</span> <span class="o"><=</span> <span class="mi">255</span>
<span class="nx">assert</span> <span class="nx">record</span><span class="p">.</span><span class="nx">inputCeiling</span> <span class="o">>=</span> <span class="mi">2</span> <span class="o">and</span> <span class="nx">record</span><span class="p">.</span><span class="nx">inputCeiling</span> <span class="o"><=</span> <span class="mi">255</span>
<span class="nx">assert</span> <span class="nx">record</span><span class="p">.</span><span class="nx">outputFloor</span> <span class="o">>=</span> <span class="mi">0</span> <span class="o">and</span> <span class="nx">record</span><span class="p">.</span><span class="nx">outputFloor</span> <span class="o"><=</span> <span class="mi">255</span>
<span class="nx">assert</span> <span class="nx">record</span><span class="p">.</span><span class="nx">outputCeiling</span> <span class="o">>=</span> <span class="mi">0</span> <span class="o">and</span> <span class="nx">record</span><span class="p">.</span><span class="nx">outputCeiling</span> <span class="o"><=</span> <span class="mi">255</span>
<span class="nx">assert</span> <span class="nx">record</span><span class="p">.</span><span class="nx">gamma</span> <span class="o">>=</span> <span class="mf">0.1</span> <span class="o">and</span> <span class="nx">record</span><span class="p">.</span><span class="nx">gamma</span> <span class="o"><=</span> <span class="mf">9.99</span>
<span class="nx">@data</span><span class="p">.</span><span class="nx">records</span><span class="p">.</span><span class="nx">push</span> <span class="nx">record</span>
</pre></div> </td> </tr> </tbody> </table> </div> </body> </html>
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