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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
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<title>generate: VIPS Reference Manual</title>
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<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#libvips-generate.description" class="shortcut">Description</a></span>
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<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
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<div class="refentry">
<a name="libvips-generate"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libvips-generate.top_of_page"></a>generate</span></h2>
<p>generate — calculate pixels and pixel buffers</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libvips-generate.stability-level"></a><h2>Stability Level</h2>
<acronym title="The intention of a Stable interface is to enable arbitrary third parties to
develop applications to these interfaces, release them, and have confidence that
they will run on all minor releases of the product (after the one in which the
interface was introduced, and within the same major release). Even at a major
release, incompatible changes are expected to be rare, and to have strong
justifications.
"><span class="acronym">Stable</span></acronym>, unless otherwise indicated
</div>
<div class="refsect1">
<a name="libvips-generate.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libvips-generate.html#VipsRegionWrite" title="VipsRegionWrite ()">*VipsRegionWrite</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-sink-disc" title="vips_sink_disc ()">vips_sink_disc</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-sink" title="vips_sink ()">vips_sink</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-sink-tile" title="vips_sink_tile ()">vips_sink_tile</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libvips-generate.html#VipsSinkNotify" title="VipsSinkNotify ()">*VipsSinkNotify</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-sink-screen" title="vips_sink_screen ()">vips_sink_screen</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-sink-memory" title="vips_sink_memory ()">vips_sink_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-start-one" title="vips_start_one ()">vips_start_one</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-stop-one" title="vips_stop_one ()">vips_stop_one</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-start-many" title="vips_start_many ()">vips_start_many</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-stop-many" title="vips_stop_many ()">vips_stop_many</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> **
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-allocate-input-array" title="vips_allocate_input_array ()">vips_allocate_input_array</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()">vips_image_generate</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-image-pipeline-array" title="vips_image_pipeline_array ()">vips_image_pipeline_array</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-generate.html#vips-image-pipelinev" title="vips_image_pipelinev ()">vips_image_pipelinev</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libvips-generate.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;vips/vips.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="libvips-generate.description"></a><h2>Description</h2>
<p>These functions let you attach generate functions to images  
and ask for regions of images to be calculated.</p>
</div>
<div class="refsect1">
<a name="libvips-generate.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="VipsRegionWrite"></a><h3>VipsRegionWrite ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
<span class="c_punctuation">(</span>*VipsRegionWrite<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="VipsRegion.html" title="VipsRegion"><span class="type">VipsRegion</span></a> *region</code></em>,
                    <em class="parameter"><code><a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *area</code></em>,
                    <em class="parameter"><code><span class="type">void</span> *a</code></em>);</pre>
<p>The function should write the pixels in <em class="parameter"><code>area</code></em>
 from <em class="parameter"><code>region</code></em>
. <em class="parameter"><code>a</code></em>
 is the 
value passed into <a class="link" href="libvips-generate.html#vips-sink-disc" title="vips_sink_disc ()"><code class="function">vips_sink_disc()</code></a>.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-sink-disc" title="vips_sink_disc ()"><code class="function">vips_sink_disc()</code></a>.</p>
<div class="refsect3">
<a name="VipsRegionWrite.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>region</p></td>
<td class="parameter_description"><p>get pixels from here</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>area</p></td>
<td class="parameter_description"><p>area to write</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>client data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="VipsRegionWrite.returns"></a><h4>Returns</h4>
<p> 0 on success, -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-sink-disc"></a><h3>vips_sink_disc ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_sink_disc (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *im</code></em>,
                <em class="parameter"><code><a class="link" href="libvips-generate.html#VipsRegionWrite" title="VipsRegionWrite ()"><span class="type">VipsRegionWrite</span></a> write_fn</code></em>,
                <em class="parameter"><code><span class="type">void</span> *a</code></em>);</pre>
<p>vips_sink_disc() loops over <em class="parameter"><code>im</code></em>
, top-to-bottom, generating it in sections.
As each section is produced, <em class="parameter"><code>write_fn</code></em>
 is called.</p>
<p><em class="parameter"><code>write_fn</code></em>
 is always called single-threaded (though not always from the same
thread), it's always given image
sections in top-to-bottom order, and there are never any gaps.</p>
<p>This operation is handy for making image sinks which output to things like 
disc files. Things like <a class="link" href="VipsForeignSave.html#vips-jpegsave" title="vips_jpegsave ()"><code class="function">vips_jpegsave()</code></a>, for example, use this to write
images to files in JPEG format. </p>
<p>See also: <a class="link" href="VipsOperation.html#vips-concurrency-set" title="vips_concurrency_set ()"><code class="function">vips_concurrency_set()</code></a>.</p>
<div class="refsect3">
<a name="vips-sink-disc.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>im</p></td>
<td class="parameter_description"><p>image to process</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>write_fn</p></td>
<td class="parameter_description"><p>called for every batch of pixels</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>client data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="vips-sink-disc.returns"></a><h4>Returns</h4>
<p> 0 on success, -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-sink"></a><h3>vips_sink ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_sink (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *im</code></em>,
           <em class="parameter"><code><a class="link" href="VipsImage.html#VipsStartFn" title="VipsStartFn ()"><span class="type">VipsStartFn</span></a> start_fn</code></em>,
           <em class="parameter"><code><a class="link" href="VipsImage.html#VipsGenerateFn" title="VipsGenerateFn ()"><span class="type">VipsGenerateFn</span></a> generate_fn</code></em>,
           <em class="parameter"><code><a class="link" href="VipsImage.html#VipsStopFn" title="VipsStopFn ()"><span class="type">VipsStopFn</span></a> stop_fn</code></em>,
           <em class="parameter"><code><span class="type">void</span> *a</code></em>,
           <em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>Loops over an image. <em class="parameter"><code>generate_fn</code></em>
 is called for every pixel in 
the image, with
the <em class="parameter"><code>reg</code></em>
 argument being a region of calculated pixels. <a class="link" href="libvips-generate.html#vips-sink" title="vips_sink ()"><code class="function">vips_sink()</code></a> is
used to implement operations like <a class="link" href="libvips-arithmetic.html#vips-avg" title="vips_avg ()"><code class="function">vips_avg()</code></a> which have no image output.</p>
<p>Each set of pixels is sized according to the requirements of the image
pipeline that generated <em class="parameter"><code>im</code></em>
.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>, <a class="link" href="VipsImage.html#vips-image-new" title="vips_image_new ()"><code class="function">vips_image_new()</code></a>.</p>
<div class="refsect3">
<a name="vips-sink.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>im</p></td>
<td class="parameter_description"><p>scan over this image</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_fn</p></td>
<td class="parameter_description"><p>start sequences with this function</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>generate_fn</p></td>
<td class="parameter_description"><p>generate pixels with this function</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>stop_fn</p></td>
<td class="parameter_description"><p>stop sequences with this function</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="vips-sink.returns"></a><h4>Returns</h4>
<p> 0 on success, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-sink-tile"></a><h3>vips_sink_tile ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_sink_tile (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *im</code></em>,
                <em class="parameter"><code><span class="type">int</span> tile_width</code></em>,
                <em class="parameter"><code><span class="type">int</span> tile_height</code></em>,
                <em class="parameter"><code><a class="link" href="VipsImage.html#VipsStartFn" title="VipsStartFn ()"><span class="type">VipsStartFn</span></a> start_fn</code></em>,
                <em class="parameter"><code><a class="link" href="VipsImage.html#VipsGenerateFn" title="VipsGenerateFn ()"><span class="type">VipsGenerateFn</span></a> generate_fn</code></em>,
                <em class="parameter"><code><a class="link" href="VipsImage.html#VipsStopFn" title="VipsStopFn ()"><span class="type">VipsStopFn</span></a> stop_fn</code></em>,
                <em class="parameter"><code><span class="type">void</span> *a</code></em>,
                <em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>Loops over an image. <em class="parameter"><code>generate_fn</code></em>
 is called for every 
pixel in the image, with
the <em class="parameter"><code>reg</code></em>
 argument being a region of calculated pixels.</p>
<p>Each set of pixels is <em class="parameter"><code>tile_width</code></em>
 by <em class="parameter"><code>tile_height</code></em>
 pixels (less at the 
image edges). This is handy for things like writing a tiled TIFF image, 
where tiles have to be generated with a certain size.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-sink" title="vips_sink ()"><code class="function">vips_sink()</code></a>, <a class="link" href="VipsThreadState.html#vips-get-tile-size" title="vips_get_tile_size ()"><code class="function">vips_get_tile_size()</code></a>.</p>
<div class="refsect3">
<a name="vips-sink-tile.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>im</p></td>
<td class="parameter_description"><p>scan over this image</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tile_width</p></td>
<td class="parameter_description"><p>tile width</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tile_height</p></td>
<td class="parameter_description"><p>tile height</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_fn</p></td>
<td class="parameter_description"><p>start sequences with this function</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>generate_fn</p></td>
<td class="parameter_description"><p>generate pixels with this function</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>stop_fn</p></td>
<td class="parameter_description"><p>stop sequences with this function</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="vips-sink-tile.returns"></a><h4>Returns</h4>
<p> 0 on success, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VipsSinkNotify"></a><h3>VipsSinkNotify ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*VipsSinkNotify<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *im</code></em>,
                   <em class="parameter"><code><a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> *rect</code></em>,
                   <em class="parameter"><code><span class="type">void</span> *a</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="vips-sink-screen"></a><h3>vips_sink_screen ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_sink_screen (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                  <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                  <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *mask</code></em>,
                  <em class="parameter"><code><span class="type">int</span> tile_width</code></em>,
                  <em class="parameter"><code><span class="type">int</span> tile_height</code></em>,
                  <em class="parameter"><code><span class="type">int</span> max_tiles</code></em>,
                  <em class="parameter"><code><span class="type">int</span> priority</code></em>,
                  <em class="parameter"><code><a class="link" href="libvips-generate.html#VipsSinkNotify" title="VipsSinkNotify ()"><span class="type">VipsSinkNotify</span></a> notify_fn</code></em>,
                  <em class="parameter"><code><span class="type">void</span> *a</code></em>);</pre>
<p>This operation renders <em class="parameter"><code>in</code></em>
 in the background, making pixels available on
<em class="parameter"><code>out</code></em>
 as they are calculated. The <em class="parameter"><code>notify_fn</code></em>
 callback is run every time a new
set of pixels are available. Calculated pixels are kept in a cache with
tiles sized <em class="parameter"><code>tile_width</code></em>
 by <em class="parameter"><code>tile_height</code></em>
 pixels and with at most <em class="parameter"><code>max_tiles</code></em>
 
tiles.
If <em class="parameter"><code>max_tiles</code></em>
 is -1, the cache is of unlimited size (up to the maximum image
size).
The <em class="parameter"><code>mask</code></em>
 image is a one-band uchar image and has 255 for pixels which are 
currently in cache and 0 for uncalculated pixels.</p>
<p>Only a single sink is calculated at any one time, though many may be
alive. Use <em class="parameter"><code>priority</code></em>
 to indicate which renders are more important:  
zero means normal
priority, negative numbers are low priority, positive numbers high
priority.</p>
<p>Calls to <a class="link" href="VipsRegion.html#vips-region-prepare" title="vips_region_prepare ()"><code class="function">vips_region_prepare()</code></a> on <em class="parameter"><code>out</code></em>
 return immediately and hold 
whatever is
currently in cache for that <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> (check <em class="parameter"><code>mask</code></em>
 to see which parts of the
<a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> are valid). Any pixels in the <a class="link" href="libvips-rect.html#VipsRect" title="VipsRect"><span class="type">VipsRect</span></a> which are not in 
cache are added
to a queue, and the <em class="parameter"><code>notify_fn</code></em>
 callback will trigger when those pixels are
ready.</p>
<p>The <em class="parameter"><code>notify_fn</code></em>
 callback is run from one of the background threads. In the 
callback
you need to somehow send a message to the main thread that the pixels are
ready. In a glib-based application, this is easily done with <code class="function">g_idle_add()</code>.</p>
<p>If <em class="parameter"><code>notify_fn</code></em>
 is <code class="literal">NULL</code> then <a class="link" href="libvips-generate.html#vips-sink-screen" title="vips_sink_screen ()"><code class="function">vips_sink_screen()</code></a> runs synchronously.
<a class="link" href="VipsRegion.html#vips-region-prepare" title="vips_region_prepare ()"><code class="function">vips_region_prepare()</code></a> on <em class="parameter"><code>out</code></em>
 will always block until the pixels have been
calculated.</p>
<p>See also: <a class="link" href="libvips-conversion.html#vips-tilecache" title="vips_tilecache ()"><code class="function">vips_tilecache()</code></a>, <a class="link" href="VipsRegion.html#vips-region-prepare" title="vips_region_prepare ()"><code class="function">vips_region_prepare()</code></a>, 
<a class="link" href="libvips-generate.html#vips-sink-disc" title="vips_sink_disc ()"><code class="function">vips_sink_disc()</code></a>, <a class="link" href="libvips-generate.html#vips-sink" title="vips_sink ()"><code class="function">vips_sink()</code></a>.</p>
<div class="refsect3">
<a name="vips-sink-screen.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>in</p></td>
<td class="parameter_description"><p>input image</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>out</p></td>
<td class="parameter_description"><p>output image</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mask</p></td>
<td class="parameter_description"><p>mask image indicating valid pixels</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tile_width</p></td>
<td class="parameter_description"><p>tile width</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tile_height</p></td>
<td class="parameter_description"><p>tile height</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>max_tiles</p></td>
<td class="parameter_description"><p>maximum tiles to cache</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>priority</p></td>
<td class="parameter_description"><p>rendering priority</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>notify_fn</p></td>
<td class="parameter_description"><p>pixels are ready notification callback</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>client data for callback</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="vips-sink-screen.returns"></a><h4>Returns</h4>
<p> 0 on sucess, -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-sink-memory"></a><h3>vips_sink_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_sink_memory (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *im</code></em>);</pre>
<p>Loops over <em class="parameter"><code>im</code></em>
, generating it to a memory buffer attached to <em class="parameter"><code>im</code></em>
. It is
used by vips to implement writing to a memory buffer.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-sink" title="vips_sink ()"><code class="function">vips_sink()</code></a>, <a class="link" href="VipsThreadState.html#vips-get-tile-size" title="vips_get_tile_size ()"><code class="function">vips_get_tile_size()</code></a>, <a class="link" href="VipsImage.html#vips-image-new-memory" title="vips_image_new_memory ()"><code class="function">vips_image_new_memory()</code></a>.</p>
<div class="refsect3">
<a name="vips-sink-memory.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>im</p></td>
<td class="parameter_description"><p>generate this image to memory</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="vips-sink-memory.returns"></a><h4>Returns</h4>
<p> 0 on success, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-start-one"></a><h3>vips_start_one ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
vips_start_one (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                <em class="parameter"><code><span class="type">void</span> *a</code></em>,
                <em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>Start function for one image in. Input image is <em class="parameter"><code>a</code></em>
.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>.</p>
<div class="refsect3">
<a name="vips-start-one.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>out</p></td>
<td class="parameter_description"><p>image to generate</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-stop-one"></a><h3>vips_stop_one ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_stop_one (<em class="parameter"><code><span class="type">void</span> *seq</code></em>,
               <em class="parameter"><code><span class="type">void</span> *a</code></em>,
               <em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>Stop function for one image in. Input image is <em class="parameter"><code>a</code></em>
.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>.</p>
<div class="refsect3">
<a name="vips-stop-one.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>seq</p></td>
<td class="parameter_description"><p>sequence value</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-start-many"></a><h3>vips_start_many ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
vips_start_many (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                 <em class="parameter"><code><span class="type">void</span> *a</code></em>,
                 <em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>Start function for many images in. <em class="parameter"><code>a</code></em>
 is a pointer to 
a <code class="literal">NULL</code>-terminated array of input images.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>, <a class="link" href="libvips-generate.html#vips-allocate-input-array" title="vips_allocate_input_array ()"><code class="function">vips_allocate_input_array()</code></a></p>
<div class="refsect3">
<a name="vips-start-many.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>out</p></td>
<td class="parameter_description"><p>image to generate</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-stop-many"></a><h3>vips_stop_many ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_stop_many (<em class="parameter"><code><span class="type">void</span> *seq</code></em>,
                <em class="parameter"><code><span class="type">void</span> *a</code></em>,
                <em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>Stop function for many images in. <em class="parameter"><code>a</code></em>
 is a pointer to 
a <code class="literal">NULL</code>-terminated array of input images.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>.</p>
<div class="refsect3">
<a name="vips-stop-many.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>seq</p></td>
<td class="parameter_description"><p>sequence value</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-allocate-input-array"></a><h3>vips_allocate_input_array ()</h3>
<pre class="programlisting"><a class="link" href="VipsImage.html" title="VipsImage"><span class="returnvalue">VipsImage</span></a> **
vips_allocate_input_array (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                           <em class="parameter"><code>...</code></em>);</pre>
<p>Convenience function --- make a <code class="literal">NULL</code>-terminated array of input images.
Use with <a class="link" href="libvips-generate.html#vips-start-many" title="vips_start_many ()"><code class="function">vips_start_many()</code></a>.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>, <a class="link" href="libvips-generate.html#vips-start-many" title="vips_start_many ()"><code class="function">vips_start_many()</code></a>.</p>
<div class="refsect3">
<a name="vips-allocate-input-array.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>out</p></td>
<td class="parameter_description"><p>free array when this image closes</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p><code class="literal">NULL</code>-terminated list of input images</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="vips-allocate-input-array.returns"></a><h4>Returns</h4>
<p> <code class="literal">NULL</code>-terminated array of images. Do not free the result.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-generate"></a><h3>vips_image_generate ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_generate (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
                     <em class="parameter"><code><a class="link" href="VipsImage.html#VipsStartFn" title="VipsStartFn ()"><span class="type">VipsStartFn</span></a> start_fn</code></em>,
                     <em class="parameter"><code><a class="link" href="VipsImage.html#VipsGenerateFn" title="VipsGenerateFn ()"><span class="type">VipsGenerateFn</span></a> generate_fn</code></em>,
                     <em class="parameter"><code><a class="link" href="VipsImage.html#VipsStopFn" title="VipsStopFn ()"><span class="type">VipsStopFn</span></a> stop_fn</code></em>,
                     <em class="parameter"><code><span class="type">void</span> *a</code></em>,
                     <em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>Generates an image. The action depends on the image type.</p>
<p>For images created with <a class="link" href="VipsImage.html#vips-image-new" title="vips_image_new ()"><code class="function">vips_image_new()</code></a>, <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a> just 
attaches the start/generate/stop callbacks and returns.</p>
<p>For images created with <a class="link" href="VipsImage.html#vips-image-new-memory" title="vips_image_new_memory ()"><code class="function">vips_image_new_memory()</code></a>, memory is allocated for 
the whole image and it is entirely generated using <a class="link" href="libvips-generate.html#vips-sink-memory" title="vips_sink_memory ()"><code class="function">vips_sink_memory()</code></a>.</p>
<p>For images created with <a class="link" href="VipsImage.html#vips-image-new-temp-file" title="vips_image_new_temp_file ()"><code class="function">vips_image_new_temp_file()</code></a> and friends, memory for 
a few scanlines is allocated and
<a class="link" href="libvips-generate.html#vips-sink-disc" title="vips_sink_disc ()"><code class="function">vips_sink_disc()</code></a> used to generate the image in small chunks. As each
chunk is generated, it is written to disc.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-sink" title="vips_sink ()"><code class="function">vips_sink()</code></a>, <a class="link" href="VipsImage.html#vips-image-new" title="vips_image_new ()"><code class="function">vips_image_new()</code></a>, <a class="link" href="VipsRegion.html#vips-region-prepare" title="vips_region_prepare ()"><code class="function">vips_region_prepare()</code></a>.</p>
<div class="refsect3">
<a name="vips-image-generate.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>generate this image</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>start_fn</p></td>
<td class="parameter_description"><p>start sequences with this function</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>generate_fn</p></td>
<td class="parameter_description"><p>generate pixels with this function</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>stop_fn</p></td>
<td class="parameter_description"><p>stop sequences with this function</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="vips-image-generate.returns"></a><h4>Returns</h4>
<p> 0 on success, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-pipeline-array"></a><h3>vips_image_pipeline_array ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_pipeline_array (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
                           <em class="parameter"><code><a class="link" href="VipsImage.html#VipsDemandStyle" title="enum VipsDemandStyle"><span class="type">VipsDemandStyle</span></a> hint</code></em>,
                           <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> **in</code></em>);</pre>
<p>Add an image to a pipeline. <em class="parameter"><code>image</code></em>
 depends on all of the images in <em class="parameter"><code>in</code></em>
,
<em class="parameter"><code>image</code></em>
 prefers to supply pixels according to <em class="parameter"><code>hint</code></em>
.</p>
<p>Operations can set demand hints, that is, hints to the VIPS IO system about
the type of region geometry they work best with. For example,
operations which transform coordinates will usually work best with
<a class="link" href="VipsImage.html#VIPS-DEMAND-STYLE-SMALLTILE:CAPS"><code class="literal">VIPS_DEMAND_STYLE_SMALLTILE</code></a>, operations which work on local windows of 
pixels will like <a class="link" href="VipsImage.html#VIPS-DEMAND-STYLE-FATSTRIP:CAPS"><code class="literal">VIPS_DEMAND_STYLE_FATSTRIP</code></a>.</p>
<p>Header fields in <em class="parameter"><code>image</code></em>
 are set from the fields in <em class="parameter"><code>in</code></em>
, with lower-numbered
images in <em class="parameter"><code>in</code></em>
 taking priority. 
For example, if <em class="parameter"><code>in</code></em>
[0] and <em class="parameter"><code>in</code></em>
[1] both have an item
called "icc-profile", it's the profile attached to <em class="parameter"><code>in</code></em>
[0] that will end up
on <em class="parameter"><code>image</code></em>
.
Image history is completely copied from all <em class="parameter"><code>in</code></em>
. <em class="parameter"><code>image</code></em>
 will have the history
of all the input images.
The array of input images can be empty, meaning <em class="parameter"><code>image</code></em>
 is at the start of a
pipeline.</p>
<p>VIPS uses the list of input images to build the tree of operations it needs
for the cache invalidation system. </p>
<p>See also: <a class="link" href="libvips-generate.html#vips-image-pipelinev" title="vips_image_pipelinev ()"><code class="function">vips_image_pipelinev()</code></a>, <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>.</p>
<div class="refsect3">
<a name="vips-image-pipeline-array.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>output image</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>hint</p></td>
<td class="parameter_description"><p>demand hint for <em class="parameter"><code>image</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>in</p></td>
<td class="parameter_description"><p><code class="literal">NULL</code>-terminated array of input images </p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="vips-image-pipeline-array.returns"></a><h4>Returns</h4>
<p> 0 on success, -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-pipelinev"></a><h3>vips_image_pipelinev ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_pipelinev (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *image</code></em>,
                      <em class="parameter"><code><a class="link" href="VipsImage.html#VipsDemandStyle" title="enum VipsDemandStyle"><span class="type">VipsDemandStyle</span></a> hint</code></em>,
                      <em class="parameter"><code>...</code></em>);</pre>
<p>Build an array and call <a class="link" href="libvips-generate.html#vips-image-pipeline-array" title="vips_image_pipeline_array ()"><code class="function">vips_image_pipeline_array()</code></a>.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>.</p>
<div class="refsect3">
<a name="vips-image-pipelinev.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>output image of pipeline</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>hint</p></td>
<td class="parameter_description"><p>hint for this image</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p><code class="literal">NULL</code>-terminated list of input images </p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="libvips-generate.other_details"></a><h2>Types and Values</h2>
</div>
<div class="refsect1">
<a name="libvips-generate.see-also"></a><h2>See Also</h2>
<a class="link" href="VipsImage.html" title="VipsImage">VipsImage</a>, 
<a class="link" href="VipsRegion.html" title="VipsRegion">VipsRegion</a>
</div>
</div>
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