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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Recording Surfaces: Cairo: A Vector Graphics Library</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="Cairo: A Vector Graphics Library"> <link rel="up" href="cairo-surfaces.html" title="Surfaces"> <link rel="prev" href="cairo-PostScript-Surfaces.html" title="PostScript Surfaces"> <link rel="next" href="cairo-Win32-Surfaces.html" title="Win32 Surfaces"> <meta name="generator" content="GTK-Doc V1.25 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <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="#cairo-Recording-Surfaces.description" class="shortcut">Description</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="cairo-surfaces.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="cairo-PostScript-Surfaces.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="cairo-Win32-Surfaces.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="cairo-Recording-Surfaces"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="cairo-Recording-Surfaces.top_of_page"></a>Recording Surfaces</span></h2> <p>Recording Surfaces — Records all drawing operations</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="cairo-Recording-Surfaces.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"> <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> * </td> <td class="function_name"> <a class="link" href="cairo-Recording-Surfaces.html#cairo-recording-surface-create" title="cairo_recording_surface_create ()">cairo_recording_surface_create</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="cairo-Recording-Surfaces.html#cairo-recording-surface-ink-extents" title="cairo_recording_surface_ink_extents ()">cairo_recording_surface_ink_extents</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a> </td> <td class="function_name"> <a class="link" href="cairo-Recording-Surfaces.html#cairo-recording-surface-get-extents" title="cairo_recording_surface_get_extents ()">cairo_recording_surface_get_extents</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="cairo-Recording-Surfaces.other"></a><h2>Types and Values</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="name"> <col class="description"> </colgroup> <tbody><tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="cairo-Recording-Surfaces.html#CAIRO-HAS-RECORDING-SURFACE:CAPS" title="CAIRO_HAS_RECORDING_SURFACE">CAIRO_HAS_RECORDING_SURFACE</a></td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="cairo-Recording-Surfaces.description"></a><h2>Description</h2> <p>A recording surface is a surface that records all drawing operations at the highest level of the surface backend interface, (that is, the level of paint, mask, stroke, fill, and show_text_glyphs). The recording surface can then be "replayed" against any target surface by using it as a source surface.</p> <p>If you want to replay a surface so that the results in target will be identical to the results that would have been obtained if the original operations applied to the recording surface had instead been applied to the target surface, you can use code like this:</p> <div class="informalexample"><pre class="programlisting"> cairo_t *cr; cr = cairo_create (target); cairo_set_source_surface (cr, recording_surface, 0.0, 0.0); cairo_paint (cr); cairo_destroy (cr); </pre></div> <p>A recording surface is logically unbounded, i.e. it has no implicit constraint on the size of the drawing surface. However, in practice this is rarely useful as you wish to replay against a particular target surface with known bounds. For this case, it is more efficient to specify the target extents to the recording surface upon creation.</p> <p>The recording phase of the recording surface is careful to snapshot all necessary objects (paths, patterns, etc.), in order to achieve accurate replay. The efficiency of the recording surface could be improved by improving the implementation of snapshot for the various objects. For example, it would be nice to have a copy-on-write implementation for _cairo_surface_snapshot.</p> </div> <div class="refsect1"> <a name="cairo-Recording-Surfaces.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="cairo-recording-surface-create"></a><h3>cairo_recording_surface_create ()</h3> <pre class="programlisting"><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="returnvalue">cairo_surface_t</span></a> * cairo_recording_surface_create (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t"><span class="type">cairo_content_t</span></a> content</code></em>, <em class="parameter"><code>const <a class="link" href="cairo-cairo-t.html#cairo-rectangle-t" title="cairo_rectangle_t"><span class="type">cairo_rectangle_t</span></a> *extents</code></em>);</pre> <p>Creates a recording-surface which can be used to record all drawing operations at the highest level (that is, the level of paint, mask, stroke, fill and show_text_glyphs). The recording surface can then be "replayed" against any target surface by using it as a source to drawing operations.</p> <p>The recording phase of the recording surface is careful to snapshot all necessary objects (paths, patterns, etc.), in order to achieve accurate replay.</p> <div class="refsect3"> <a name="cairo-recording-surface-create.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>content</p></td> <td class="parameter_description"><p>the content of the recording surface</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>extents</p></td> <td class="parameter_description"><p>the extents to record in pixels, can be <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to record unbounded operations.</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="cairo-recording-surface-create.returns"></a><h4>Returns</h4> <p> a pointer to the newly created surface. The caller owns the surface and should call <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-destroy" title="cairo_surface_destroy ()"><code class="function">cairo_surface_destroy()</code></a> when done with it.</p> </div> <p class="since">Since: 1.10</p> </div> <hr> <div class="refsect2"> <a name="cairo-recording-surface-ink-extents"></a><h3>cairo_recording_surface_ink_extents ()</h3> <pre class="programlisting"><span class="returnvalue">void</span> cairo_recording_surface_ink_extents (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>, <em class="parameter"><code><span class="type">double</span> *x0</code></em>, <em class="parameter"><code><span class="type">double</span> *y0</code></em>, <em class="parameter"><code><span class="type">double</span> *width</code></em>, <em class="parameter"><code><span class="type">double</span> *height</code></em>);</pre> <p>Measures the extents of the operations stored within the recording-surface. This is useful to compute the required size of an image surface (or equivalent) into which to replay the full sequence of drawing operations.</p> <div class="refsect3"> <a name="cairo-recording-surface-ink-extents.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>surface</p></td> <td class="parameter_description"><p>a <span class="type">cairo_recording_surface_t</span></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>x0</p></td> <td class="parameter_description"><p>the x-coordinate of the top-left of the ink bounding box</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>y0</p></td> <td class="parameter_description"><p>the y-coordinate of the top-left of the ink bounding box</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>width</p></td> <td class="parameter_description"><p>the width of the ink bounding box</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>height</p></td> <td class="parameter_description"><p>the height of the ink bounding box</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <p class="since">Since: 1.10</p> </div> <hr> <div class="refsect2"> <a name="cairo-recording-surface-get-extents"></a><h3>cairo_recording_surface_get_extents ()</h3> <pre class="programlisting"><a class="link" href="cairo-Types.html#cairo-bool-t" title="cairo_bool_t"><span class="returnvalue">cairo_bool_t</span></a> cairo_recording_surface_get_extents (<em class="parameter"><code><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a> *surface</code></em>, <em class="parameter"><code><a class="link" href="cairo-cairo-t.html#cairo-rectangle-t" title="cairo_rectangle_t"><span class="type">cairo_rectangle_t</span></a> *extents</code></em>);</pre> <p>Get the extents of the recording-surface.</p> <div class="refsect3"> <a name="cairo-recording-surface-get-extents.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>surface</p></td> <td class="parameter_description"><p>a <span class="type">cairo_recording_surface_t</span></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>extents</p></td> <td class="parameter_description"><p>the <a class="link" href="cairo-cairo-t.html#cairo-rectangle-t" title="cairo_rectangle_t"><span class="type">cairo_rectangle_t</span></a> to be assigned the extents</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="cairo-recording-surface-get-extents.returns"></a><h4>Returns</h4> <p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the surface is bounded, of recording type, and not in an error state, otherwise <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a></p> </div> <p class="since">Since: 1.12</p> </div> </div> <div class="refsect1"> <a name="cairo-Recording-Surfaces.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="CAIRO-HAS-RECORDING-SURFACE:CAPS"></a><h3>CAIRO_HAS_RECORDING_SURFACE</h3> <pre class="programlisting">#define CAIRO_HAS_RECORDING_SURFACE 1 </pre> <p>Defined if the recording surface backend is available. The recording surface backend is always built in. This macro was added for completeness in cairo 1.10.</p> <p class="since">Since: 1.10</p> </div> </div> <div class="refsect1"> <a name="cairo-Recording-Surfaces.see-also"></a><h2>See Also</h2> <p><a class="link" href="cairo-cairo-surface-t.html#cairo-surface-t" title="cairo_surface_t"><span class="type">cairo_surface_t</span></a></p> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.25</div> </body> </html>