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| <div class="refentry"> |
| <a name="gdk-pixbuf-Xlib-Rendering"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="gdk-pixbuf-Xlib-Rendering.top_of_page"></a>Xlib Rendering</span></h2> |
| <p>Xlib Rendering — Rendering a pixbuf to an X drawable.</p> |
| </td> |
| <td class="gallery_image" valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsect1"> |
| <a name="gdk-pixbuf-Xlib-Rendering.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">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gdk-pixbuf-Xlib-Rendering.html#gdk-pixbuf-xlib-render-threshold-alpha" title="gdk_pixbuf_xlib_render_threshold_alpha ()">gdk_pixbuf_xlib_render_threshold_alpha</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="gdk-pixbuf-Xlib-Rendering.html#gdk-pixbuf-xlib-render-to-drawable" title="gdk_pixbuf_xlib_render_to_drawable ()">gdk_pixbuf_xlib_render_to_drawable</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="gdk-pixbuf-Xlib-Rendering.html#gdk-pixbuf-xlib-render-to-drawable-alpha" title="gdk_pixbuf_xlib_render_to_drawable_alpha ()">gdk_pixbuf_xlib_render_to_drawable_alpha</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="gdk-pixbuf-Xlib-Rendering.html#gdk-pixbuf-xlib-render-pixmap-and-mask" title="gdk_pixbuf_xlib_render_pixmap_and_mask ()">gdk_pixbuf_xlib_render_pixmap_and_mask</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gdk-pixbuf-Xlib-Rendering.includes"></a><h2>Includes</h2> |
| <pre class="synopsis">#include <gdk-pixbuf/gdk-pixbuf.h> |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gdk-pixbuf-Xlib-Rendering.description"></a><h2>Description</h2> |
| <p>The &gdk-pixbuf; Xlib library provides several convenience |
| functions to render pixbufs to X drawables. It uses XlibRGB to |
| render the image data.</p> |
| <p>These functions are analogous to those for the GDK version of |
| &gdk-pixbuf;.</p> |
| </div> |
| <div class="refsect1"> |
| <a name="gdk-pixbuf-Xlib-Rendering.functions_details"></a><h2>Functions</h2> |
| <div class="refsect2"> |
| <a name="gdk-pixbuf-xlib-render-threshold-alpha"></a><h3>gdk_pixbuf_xlib_render_threshold_alpha ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gdk_pixbuf_xlib_render_threshold_alpha |
| (<em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *pixbuf</code></em>, |
| <em class="parameter"><code><span class="type">Pixmap</span> bitmap</code></em>, |
| <em class="parameter"><code><span class="type">int</span> src_x</code></em>, |
| <em class="parameter"><code><span class="type">int</span> src_y</code></em>, |
| <em class="parameter"><code><span class="type">int</span> dest_x</code></em>, |
| <em class="parameter"><code><span class="type">int</span> dest_y</code></em>, |
| <em class="parameter"><code><span class="type">int</span> width</code></em>, |
| <em class="parameter"><code><span class="type">int</span> height</code></em>, |
| <em class="parameter"><code><span class="type">int</span> alpha_threshold</code></em>);</pre> |
| <p>Takes the opacity values in a rectangular portion of a pixbuf and thresholds |
| them to produce a bi-level alpha mask that can be used as a clipping mask for |
| a drawable.</p> |
| <div class="refsect3"> |
| <a name="gdk-pixbuf-xlib-render-threshold-alpha.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>pixbuf</p></td> |
| <td class="parameter_description"><p>A pixbuf.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>bitmap</p></td> |
| <td class="parameter_description"><p>Bitmap where the bilevel mask will be painted to.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>src_x</p></td> |
| <td class="parameter_description"><p>Source X coordinate.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>src_y</p></td> |
| <td class="parameter_description"><p>source Y coordinate.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dest_x</p></td> |
| <td class="parameter_description"><p>Destination X coordinate.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dest_y</p></td> |
| <td class="parameter_description"><p>Destination Y coordinate.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>width</p></td> |
| <td class="parameter_description"><p>Width of region to threshold.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>height</p></td> |
| <td class="parameter_description"><p>Height of region to threshold.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>alpha_threshold</p></td> |
| <td class="parameter_description"><p>Opacity values below this will be painted as zero; all |
| other values will be painted as one.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gdk-pixbuf-xlib-render-to-drawable"></a><h3>gdk_pixbuf_xlib_render_to_drawable ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gdk_pixbuf_xlib_render_to_drawable (<em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *pixbuf</code></em>, |
| <em class="parameter"><code><span class="type">Drawable</span> drawable</code></em>, |
| <em class="parameter"><code><span class="type">GC</span> gc</code></em>, |
| <em class="parameter"><code><span class="type">int</span> src_x</code></em>, |
| <em class="parameter"><code><span class="type">int</span> src_y</code></em>, |
| <em class="parameter"><code><span class="type">int</span> dest_x</code></em>, |
| <em class="parameter"><code><span class="type">int</span> dest_y</code></em>, |
| <em class="parameter"><code><span class="type">int</span> width</code></em>, |
| <em class="parameter"><code><span class="type">int</span> height</code></em>, |
| <em class="parameter"><code><a class="link" href="gdk-pixbuf-XlibRGB.html#XlibRgbDither" title="enum XlibRgbDither"><span class="type">XlibRgbDither</span></a> dither</code></em>, |
| <em class="parameter"><code><span class="type">int</span> x_dither</code></em>, |
| <em class="parameter"><code><span class="type">int</span> y_dither</code></em>);</pre> |
| <p>Renders a rectangular portion of a pixbuf to a drawable while using the |
| specified GC. This is done using XlibRGB, so the specified drawable must |
| have the XlibRGB visual and colormap. Note that this function will ignore |
| the opacity information for images with an alpha channel; the GC must already |
| have the clipping mask set if you want transparent regions to show through.</p> |
| <p>For an explanation of dither offsets, see the XlibRGB documentation. In |
| brief, the dither offset is important when re-rendering partial regions of an |
| image to a rendered version of the full image, or for when the offsets to a |
| base position change, as in scrolling. The dither matrix has to be shifted |
| for consistent visual results. If you do not have any of these cases, the |
| dither offsets can be both zero.</p> |
| <div class="refsect3"> |
| <a name="gdk-pixbuf-xlib-render-to-drawable.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>pixbuf</p></td> |
| <td class="parameter_description"><p>A pixbuf.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>drawable</p></td> |
| <td class="parameter_description"><p>Destination drawable.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>gc</p></td> |
| <td class="parameter_description"><p>GC used for rendering.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>src_x</p></td> |
| <td class="parameter_description"><p>Source X coordinate within pixbuf.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>src_y</p></td> |
| <td class="parameter_description"><p>Source Y coordinate within pixbuf.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dest_x</p></td> |
| <td class="parameter_description"><p>Destination X coordinate within drawable.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dest_y</p></td> |
| <td class="parameter_description"><p>Destination Y coordinate within drawable.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>width</p></td> |
| <td class="parameter_description"><p>Width of region to render, in pixels.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>height</p></td> |
| <td class="parameter_description"><p>Height of region to render, in pixels.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dither</p></td> |
| <td class="parameter_description"><p>Dithering mode for XlibRGB.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>x_dither</p></td> |
| <td class="parameter_description"><p>X offset for dither.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>y_dither</p></td> |
| <td class="parameter_description"><p>Y offset for dither.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gdk-pixbuf-xlib-render-to-drawable-alpha"></a><h3>gdk_pixbuf_xlib_render_to_drawable_alpha ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gdk_pixbuf_xlib_render_to_drawable_alpha |
| (<em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *pixbuf</code></em>, |
| <em class="parameter"><code><span class="type">Drawable</span> drawable</code></em>, |
| <em class="parameter"><code><span class="type">int</span> src_x</code></em>, |
| <em class="parameter"><code><span class="type">int</span> src_y</code></em>, |
| <em class="parameter"><code><span class="type">int</span> dest_x</code></em>, |
| <em class="parameter"><code><span class="type">int</span> dest_y</code></em>, |
| <em class="parameter"><code><span class="type">int</span> width</code></em>, |
| <em class="parameter"><code><span class="type">int</span> height</code></em>, |
| <em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbufAlphaMode" title="enum GdkPixbufAlphaMode"><span class="type">GdkPixbufAlphaMode</span></a> alpha_mode</code></em>, |
| <em class="parameter"><code><span class="type">int</span> alpha_threshold</code></em>, |
| <em class="parameter"><code><a class="link" href="gdk-pixbuf-XlibRGB.html#XlibRgbDither" title="enum XlibRgbDither"><span class="type">XlibRgbDither</span></a> dither</code></em>, |
| <em class="parameter"><code><span class="type">int</span> x_dither</code></em>, |
| <em class="parameter"><code><span class="type">int</span> y_dither</code></em>);</pre> |
| <p>Renders a rectangular portion of a pixbuf to a drawable. This is done using |
| XlibRGB, so the specified drawable must have the XlibRGB visual and colormap.</p> |
| <p>When used with <a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GDK-PIXBUF-ALPHA-BILEVEL:CAPS"><span class="type">GDK_PIXBUF_ALPHA_BILEVEL</span></a>, this function has to create a bitmap |
| out of the thresholded alpha channel of the image and, it has to set this |
| bitmap as the clipping mask for the GC used for drawing. This can be a |
| significant performance penalty depending on the size and the complexity of |
| the alpha channel of the image. If performance is crucial, consider handling |
| the alpha channel yourself (possibly by caching it in your application) and |
| using <a class="link" href="gdk-pixbuf-Xlib-Rendering.html#gdk-pixbuf-xlib-render-to-drawable" title="gdk_pixbuf_xlib_render_to_drawable ()"><code class="function">gdk_pixbuf_xlib_render_to_drawable()</code></a> or GdkRGB directly instead.</p> |
| <div class="refsect3"> |
| <a name="gdk-pixbuf-xlib-render-to-drawable-alpha.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>pixbuf</p></td> |
| <td class="parameter_description"><p>A pixbuf.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>drawable</p></td> |
| <td class="parameter_description"><p>Destination drawable.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>src_x</p></td> |
| <td class="parameter_description"><p>Source X coordinate within pixbuf.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>src_y</p></td> |
| <td class="parameter_description"><p>Source Y coordinates within pixbuf.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dest_x</p></td> |
| <td class="parameter_description"><p>Destination X coordinate within drawable.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dest_y</p></td> |
| <td class="parameter_description"><p>Destination Y coordinate within drawable.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>width</p></td> |
| <td class="parameter_description"><p>Width of region to render, in pixels.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>height</p></td> |
| <td class="parameter_description"><p>Height of region to render, in pixels.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>alpha_mode</p></td> |
| <td class="parameter_description"><p>If the image does not have opacity information, this is ignored. |
| Otherwise, specifies how to handle transparency when rendering.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>alpha_threshold</p></td> |
| <td class="parameter_description"><p>If the image does have opacity information and <em class="parameter"><code>alpha_mode</code></em> |
| is GDK_PIXBUF_ALPHA_BILEVEL, specifies the threshold value for opacity |
| values.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>dither</p></td> |
| <td class="parameter_description"><p>Dithering mode for XlibRGB.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>x_dither</p></td> |
| <td class="parameter_description"><p>X offset for dither.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>y_dither</p></td> |
| <td class="parameter_description"><p>Y offset for dither.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gdk-pixbuf-xlib-render-pixmap-and-mask"></a><h3>gdk_pixbuf_xlib_render_pixmap_and_mask ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gdk_pixbuf_xlib_render_pixmap_and_mask |
| (<em class="parameter"><code><a class="link" href="gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *pixbuf</code></em>, |
| <em class="parameter"><code><span class="type">Pixmap</span> *pixmap_return</code></em>, |
| <em class="parameter"><code><span class="type">Pixmap</span> *mask_return</code></em>, |
| <em class="parameter"><code><span class="type">int</span> alpha_threshold</code></em>);</pre> |
| <p>Creates a pixmap and a mask bitmap which are returned in the <em class="parameter"><code>pixmap_return</code></em> |
| |
| and <em class="parameter"><code>mask_return</code></em> |
| arguments, respectively, and renders a pixbuf and its |
| corresponding tresholded alpha mask to them. This is merely a convenience |
| function; applications that need to render pixbufs with dither offsets or to |
| given drawables should use <a class="link" href="gdk-pixbuf-Xlib-Rendering.html#gdk-pixbuf-xlib-render-to-drawable-alpha" title="gdk_pixbuf_xlib_render_to_drawable_alpha ()"><code class="function">gdk_pixbuf_xlib_render_to_drawable_alpha()</code></a> or |
| <a class="link" href="gdk-pixbuf-Xlib-Rendering.html#gdk-pixbuf-xlib-render-to-drawable" title="gdk_pixbuf_xlib_render_to_drawable ()"><code class="function">gdk_pixbuf_xlib_render_to_drawable()</code></a>, and |
| <a class="link" href="gdk-pixbuf-Xlib-Rendering.html#gdk-pixbuf-xlib-render-threshold-alpha" title="gdk_pixbuf_xlib_render_threshold_alpha ()"><code class="function">gdk_pixbuf_xlib_render_threshold_alpha()</code></a>.</p> |
| <p>If the pixbuf does not have an alpha channel, then *<em class="parameter"><code>mask_return</code></em> |
| will be set |
| to None.</p> |
| <div class="refsect3"> |
| <a name="gdk-pixbuf-xlib-render-pixmap-and-mask.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>pixbuf</p></td> |
| <td class="parameter_description"><p>A pixbuf.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>pixmap_return</p></td> |
| <td class="parameter_description"><p>Return value for the created pixmap.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>mask_return</p></td> |
| <td class="parameter_description"><p>Return value for the created mask.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>alpha_threshold</p></td> |
| <td class="parameter_description"><p>Threshold value for opacity values.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gdk-pixbuf-Xlib-Rendering.other_details"></a><h2>Types and Values</h2> |
| </div> |
| </div> |
| <div class="footer"> |
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| </body> |
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