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<!DOCTYPE html> <html> <head> <title>psdlayermask.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="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" href="exposure.html"> exposure.coffee </a> <a class="source" href="gradient.html"> gradient.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="pattern.html"> pattern.coffee </a> <a class="source" href="photofilter.html"> photofilter.coffee </a> <a class="source" href="posterize.html"> posterize.coffee </a> <a class="source" href="selectivecolor.html"> selectivecolor.coffee </a> <a class="source" href="solidcolor.html"> solidcolor.coffee </a> <a class="source" href="threshold.html"> threshold.coffee </a> <a class="source" href="typetool.html"> typetool.coffee </a> <a class="source" href="vibrance.html"> vibrance.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> psdlayermask.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">PSDLayerMask</span>
<span class="nv">constructor: </span><span class="nf">(@file, @header, @options) -></span></pre></div> </td> </tr> <tr id="section-2"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-2">¶</a> </div> <p>Array to hold all of the layers</p> </td> <td class="code"> <div class="highlight"><pre> <span class="vi">@layers = </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">¶</a> </div> <p>Does the first alpha channel contain the transparency data?</p> </td> <td class="code"> <div class="highlight"><pre> <span class="vi">@mergedAlpha = </span><span class="kc">false</span></pre></div> </td> </tr> <tr id="section-4"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-4">¶</a> </div> <p>The global layer mask</p> </td> <td class="code"> <div class="highlight"><pre> <span class="vi">@globalMask = </span><span class="p">{}</span></pre></div> </td> </tr> <tr id="section-5"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-5">¶</a> </div> <p>Additional layer information</p> </td> <td class="code"> <div class="highlight"><pre> <span class="vi">@extras = </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">¶</a> </div> <p>Skip over this section and don't parse it</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">skip: </span><span class="o">-></span> <span class="nx">@file</span><span class="p">.</span><span class="nx">seek</span> <span class="nx">@file</span><span class="p">.</span><span class="nx">readInt</span><span class="p">()</span>
<span class="nv">parse: </span><span class="o">-></span></pre></div> </td> </tr> <tr id="section-7"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-7">¶</a> </div> <p>Read the size of the entire layers and masks section</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">maskSize = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readInt</span><span class="p">()</span>
<span class="nv">endLoc = </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">maskSize</span>
<span class="nx">Log</span><span class="p">.</span><span class="nx">debug</span> <span class="s2">"Layer mask size is #{maskSize}"</span></pre></div> </td> </tr> <tr id="section-8"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-8">¶</a> </div> <p>If the mask size is > 0, then parse the section. Otherwise,
this section doesn't exist and the whole layers/masks data
is 4 bytes (the length we've already read)</p> </td> <td class="code"> <div class="highlight"><pre> <span class="k">return</span> <span class="k">if</span> <span class="nx">maskSize</span> <span class="o"><=</span> <span class="mi">0</span>
</pre></div> </td> </tr> <tr id="section-9"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-9">¶</a> </div> <p>Size of the layer info section. 4 bytes, rounded up by 2's.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">layerInfoSize = </span><span class="nx">Util</span><span class="p">.</span><span class="nx">pad2</span> <span class="nx">@file</span><span class="p">.</span><span class="nx">readInt</span><span class="p">()</span></pre></div> </td> </tr> <tr id="section-10"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-10">¶</a> </div> <p>Store the current position in case we need to bail
and skip over this section.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">pos = </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-11"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-11">¶</a> </div> <p>If the layer info size is > 0, then we have some layers</p> </td> <td class="code"> <div class="highlight"><pre> <span class="k">if</span> <span class="nx">layerInfoSize</span> <span class="o">></span> <span class="mi">0</span></pre></div> </td> </tr> <tr id="section-12"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-12">¶</a> </div> <p>Read the number of layers, 2 bytes.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="vi">@numLayers = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readShortInt</span><span class="p">()</span></pre></div> </td> </tr> <tr id="section-13"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-13">¶</a> </div> <p>If the number of layers is negative, the absolute value is
the actual number of layers, and the first alpha channel contains
the transparency data for the merged image.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="k">if</span> <span class="nx">@numLayers</span> <span class="o"><</span> <span class="mi">0</span>
<span class="nx">Log</span><span class="p">.</span><span class="nx">debug</span> <span class="s2">"Note: first alpha channel contains transparency data"</span>
<span class="vi">@numLayers = </span><span class="nb">Math</span><span class="p">.</span><span class="nx">abs</span> <span class="nx">@numLayers</span>
<span class="vi">@mergedAlpha = </span><span class="kc">true</span>
<span class="k">if</span> <span class="nx">@numLayers</span> <span class="o">*</span> <span class="p">(</span><span class="mi">18</span> <span class="o">+</span> <span class="mi">6</span> <span class="o">*</span> <span class="nx">@header</span><span class="p">.</span><span class="nx">channels</span><span class="p">)</span> <span class="o">></span> <span class="nx">layerInfoSize</span>
<span class="k">throw</span> <span class="s2">"Unlikely number of #{@numLayers} layers for #{@header['channels']} with #{layerInfoSize} layer info size. Giving up."</span>
<span class="nx">Log</span><span class="p">.</span><span class="nx">debug</span> <span class="s2">"Found #{@numLayers} layer(s)"</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">@numLayers</span><span class="p">]</span>
<span class="nv">layer = </span><span class="k">new</span> <span class="nx">PSDLayer</span> <span class="nx">@file</span>
<span class="nx">layer</span><span class="p">.</span><span class="nx">parse</span><span class="p">(</span><span class="nx">i</span><span class="p">)</span>
<span class="nx">@layers</span><span class="p">.</span><span class="nx">push</span> <span class="nx">layer</span>
<span class="k">for</span> <span class="nx">layer</span> <span class="k">in</span> <span class="nx">@layers</span>
<span class="k">if</span> <span class="nx">layer</span><span class="p">.</span><span class="nx">isFolder</span> <span class="o">or</span> <span class="nx">layer</span><span class="p">.</span><span class="nx">isHidden</span></pre></div> </td> </tr> <tr id="section-14"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-14">¶</a> </div> <p>Layer contains no image data. Skip ahead.</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">8</span>
<span class="k">continue</span>
<span class="nv">layer.image = </span><span class="k">new</span> <span class="nx">PSDChannelImage</span><span class="p">(</span><span class="nx">@file</span><span class="p">,</span> <span class="nx">@header</span><span class="p">,</span> <span class="nx">layer</span><span class="p">)</span>
<span class="k">if</span> <span class="nx">@options</span><span class="p">.</span><span class="nx">layerImages</span> <span class="o">and</span> <span class="p">(</span>
<span class="p">(</span><span class="nx">@options</span><span class="p">.</span><span class="nx">onlyVisibleLayers</span> <span class="o">and</span> <span class="nx">layer</span><span class="p">.</span><span class="nx">visible</span><span class="p">)</span> <span class="o">or</span>
<span class="o">!</span><span class="nx">@options</span><span class="p">.</span><span class="nx">onlyVisibleLayers</span>
<span class="p">)</span>
<span class="nx">layer</span><span class="p">.</span><span class="nx">image</span><span class="p">.</span><span class="nx">parse</span><span class="p">()</span>
<span class="k">else</span>
<span class="nx">layer</span><span class="p">.</span><span class="nx">image</span><span class="p">.</span><span class="nx">skip</span><span class="p">()</span></pre></div> </td> </tr> <tr id="section-15"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-15">¶</a> </div> <p>Layers are parsed in reverse order</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nx">@layers</span><span class="p">.</span><span class="nx">reverse</span><span class="p">()</span>
<span class="nx">@groupLayers</span><span class="p">()</span></pre></div> </td> </tr> <tr id="section-16"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-16">¶</a> </div> <p>In case there are filler zeros</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="nx">pos</span> <span class="o">+</span> <span class="nx">layerInfoSize</span><span class="p">,</span> <span class="kc">false</span></pre></div> </td> </tr> <tr id="section-17"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-17">¶</a> </div> <p>Parse the global layer mask</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nx">@parseGlobalMask</span><span class="p">()</span></pre></div> </td> </tr> <tr id="section-18"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-18">¶</a> </div> <p>Temporarily skip the rest of layers & masks section</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="nx">endLoc</span><span class="p">,</span> <span class="kc">false</span>
<span class="k">return</span></pre></div> </td> </tr> <tr id="section-19"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-19">¶</a> </div> <p>We have more additional info to parse, especially beacuse this is PS >= 4.0
@parseExtraInfo(endLoc) if @file.tell() < endLoc</p> </td> <td class="code"> <div class="highlight"><pre> <span class="nv">parseGlobalMask: </span><span class="o">-></span>
<span class="nv">length = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readInt</span><span class="p">()</span>
<span class="k">return</span> <span class="k">if</span> <span class="nx">length</span> <span class="o">is</span> <span class="mi">0</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">end = </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">length</span>
<span class="nx">Log</span><span class="p">.</span><span class="nx">debug</span> <span class="s2">"Global mask length: #{length}"</span></pre></div> </td> </tr> <tr id="section-20"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-20">¶</a> </div> <p>Undocumented</p> </td> <td class="code"> <div class="highlight"><pre> <span class="vi">@globalMask.overlayColorSpace = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readShortInt</span><span class="p">()</span></pre></div> </td> </tr> <tr id="section-21"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-21">¶</a> </div> <p>TODO: parse color space components into actual color.</p> </td> <td class="code"> <div class="highlight"><pre> <span class="vi">@globalMask.colorComponents = </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="mi">4</span><span class="p">]</span>
<span class="nx">@globalMask</span><span class="p">.</span><span class="nx">colorComponents</span><span class="p">.</span><span class="nx">push</span><span class="p">(</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">8</span><span class="p">)</span></pre></div> </td> </tr> <tr id="section-22"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-22">¶</a> </div> <p>0 = transparent, 100 = opaque</p> </td> <td class="code"> <div class="highlight"><pre> <span class="vi">@globalMask.opacity = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">readShortInt</span><span class="p">()</span></pre></div> </td> </tr> <tr id="section-23"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-23">¶</a> </div> <p>0 = color selected; 1 = color protected; 128 = use value per layer</p> </td> <td class="code"> <div class="highlight"><pre> <span class="vi">@globalMask.kind = </span><span class="nx">@file</span><span class="p">.</span><span class="nx">read</span><span class="p">(</span><span class="mi">1</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
<span class="nx">Log</span><span class="p">.</span><span class="nx">debug</span> <span class="s2">"Global mask:"</span><span class="p">,</span> <span class="nx">@globalMask</span></pre></div> </td> </tr> <tr id="section-24"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-24">¶</a> </div> <p>Filler zeros, seek to end.</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="nx">end</span><span class="p">,</span> <span class="kc">false</span>
<span class="nv">parseExtraInfo: </span><span class="nf">(end) -></span>
<span class="k">while</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">end</span></pre></div> </td> </tr> <tr id="section-25"> <td class="docs"> <div class="pilwrap"> <a class="pilcrow" href="#section-25">¶</a> </div> <p>Temporary</p> </td> <td class="code"> <div class="highlight"><pre> <span class="p">[</span>
<span class="nx">sig</span><span class="p">,</span>
<span class="nx">key</span><span class="p">,</span>
<span class="nx">length</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">">4s4sI"</span>
<span class="nv">length = </span><span class="nx">Util</span><span class="p">.</span><span class="nx">pad2</span> <span class="nx">length</span>
<span class="nx">Log</span><span class="p">.</span><span class="nx">debug</span> <span class="s2">"Layer extra:"</span><span class="p">,</span> <span class="nx">sig</span><span class="p">,</span> <span class="nx">key</span><span class="p">,</span> <span class="nx">length</span>
<span class="nx">@file</span><span class="p">.</span><span class="nx">seek</span> <span class="nx">length</span>
<span class="nv">groupLayers: </span><span class="o">-></span>
<span class="nv">groupLayer = </span><span class="kc">null</span>
<span class="k">for</span> <span class="nx">layer</span> <span class="k">in</span> <span class="nx">@layers</span>
<span class="k">if</span> <span class="nx">layer</span><span class="p">.</span><span class="nx">isFolder</span>
<span class="nv">groupLayer = </span><span class="nx">layer</span>
<span class="k">else</span> <span class="k">if</span> <span class="nx">layer</span><span class="p">.</span><span class="nx">isHidden</span>
<span class="nv">groupLayer = </span><span class="kc">null</span>
<span class="k">else</span>
<span class="nv">layer.groupLayer = </span><span class="nx">groupLayer</span>
<span class="nv">toJSON: </span><span class="o">-></span>
<span class="nv">data =</span>
<span class="nv">mergedAlpha: </span><span class="nx">@mergedAlpha</span>
<span class="nv">globalMask: </span><span class="nx">@globalMask</span>
<span class="nv">extraInfo: </span><span class="nx">@extras</span>
<span class="nv">numLayers: </span><span class="nx">@numLayers</span>
<span class="nv">layers: </span><span class="p">[]</span>
<span class="k">for</span> <span class="nx">layer</span> <span class="k">in</span> <span class="nx">@layers</span>
<span class="nx">data</span><span class="p">.</span><span class="nx">layers</span><span class="p">.</span><span class="nx">push</span> <span class="nx">layer</span><span class="p">.</span><span class="nx">toJSON</span><span class="p">()</span>
<span class="nx">data</span>
</pre></div> </td> </tr> </tbody> </table> </div> </body> </html>
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