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| 32 | <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QPNGImagePacker Class Reference</h1>
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| 33 |
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| 34 | <p>The QPNGImagePacker class creates well-compressed PNG animations.
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| 35 | <a href="#details">More...</a>
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| 36 | <p><tt>#include <<a href="qpngio-h.html">qpngio.h</a>></tt>
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| 37 | <p><a href="qpngimagepacker-members.html">List of all member functions.</a>
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| 38 | <h2>Public Members</h2>
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| 39 | <ul>
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| 40 | <li class=fn><a href="#QPNGImagePacker"><b>QPNGImagePacker</b></a> ( QIODevice * iod, int storage_depth, int conversionflags )</li>
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| 41 | <li class=fn>void <a href="#setPixelAlignment"><b>setPixelAlignment</b></a> ( int x )</li>
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| 42 | <li class=fn>bool <a href="#packImage"><b>packImage</b></a> ( const QImage & img )</li>
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| 43 | </ul>
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| 44 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 45 |
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| 46 |
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| 47 | The QPNGImagePacker class creates well-compressed PNG animations.
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| 48 | <p>
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| 49 |
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| 50 | <p> By using transparency, QPNGImagePacker allows you to build a PNG
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| 51 | image from a sequence of QImages.
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| 52 | <p> Images are added using <a href="#packImage">packImage</a>().
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| 53 | <p>See also <a href="graphics.html">Graphics Classes</a> and <a href="images.html">Image Processing Classes</a>.
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| 54 |
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| 55 | <hr><h2>Member Function Documentation</h2>
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| 56 | <h3 class=fn><a name="QPNGImagePacker"></a>QPNGImagePacker::QPNGImagePacker ( <a href="qiodevice.html">QIODevice</a> * iod, int storage_depth, int conversionflags )
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| 57 | </h3>
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| 58 | Creates an image packer that writes PNG data to IO device <em>iod</em>
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| 59 | using a <em>storage_depth</em> bit encoding (use 8 or 32, depending on
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| 60 | the desired quality and compression requirements).
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| 61 | <p> If the image needs to be modified to fit in a lower-resolution
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| 62 | result (e.g. converting from 32-bit to 8-bit), use the <em>conversionflags</em> to specify how you'd prefer this to happen.
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| 63 | <p> <p>See also <a href="qt.html#ImageConversionFlags-enum">Qt::ImageConversionFlags</a>.
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| 64 |
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| 65 | <h3 class=fn>bool <a name="packImage"></a>QPNGImagePacker::packImage ( const <a href="qimage.html">QImage</a> & img )
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| 66 | </h3>
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| 67 | Adds the image <em>img</em> to the PNG animation, analyzing the
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| 68 | differences between this and the previous image to improve
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| 69 | compression.
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| 70 |
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| 71 | <h3 class=fn>void <a name="setPixelAlignment"></a>QPNGImagePacker::setPixelAlignment ( int x )
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| 72 | </h3>
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| 73 | Aligns pixel differences to <em>x</em> pixels. For example, using 8 can
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| 74 | improve playback on certain hardware. Normally the default of
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| 75 | 1-pixel alignment (i.e. no alignment) gives better compression and
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| 76 | performance.
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| 77 |
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