Merge "cherrypick from hc-mr2 Change-Id: Iea8df8fda144d4c66d407927d260263c9982df51"

page.title=etc1tool

parent.title=Tools

parent.link=index.html

@jd:body

 <p><code>etc1tool</code> is a command line utility that lets you encode PNG

 images to the ETC1 compression standard and decode ETC1 compressed images back to PNG.</p>

  <p>The usage for <code>etc1tool</code> is:</p>

<pre>etc1tool infile [--help | --encode | --encodeNoHeader | --decode] [--showDifference

diff-file] [-o outfile]</pre>

  <table>

    <tr>

      <th>Option</th>

      <th>Description</th>

    </tr>

    <tr>

      <td><code>infile</code></td>

      <td>The input file to compress</td>

    </tr>

    <tr>

      <td><code>--help</code></td>

      <td>Print usage information</td>

    </tr>

    <tr>

      <td><code>--encode</code></td>

      <td>Create an ETC1 file from a PNG file.

      This is the default mode for the tool if nothing is specified.</td>

    </tr>

    <tr>

      <td><code>--encodeNoHeader</code></td>

      <td>Create a raw ETC1 data file (without a header) from a PNG file.</td>

    </tr>

    <tr>

      <td><code>--decode</code></td>

      <td>Create a PNG file from an ETC1 file</td>

    </tr>

    <tr>

      <td><code>--showDifference <em>diff-file</em></code></td>

      <td>Write the difference between the original and encoded image to

      <code><em>diff-file</em></code> (only valid when encoding).</td>

    </tr>

    <tr>

      <td><code>-o <em>outfile</em></code></td>

      <td>Specify the name of the output file.

      If <code><em>outfile</em></code> is not specified, the output file is constructed

      from the input filename with the appropriate suffix (<code>.pkm</code> or <code>.png</code>).

      </td>

    </tr>

  </table>

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