gdk-gdkrgb.html

最新gtk中文资料集

<td> a <a class="link" href="gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em>&#160;:</span></p></td>
<td> X coordinate on <em class="parameter"><code>drawable</code></em> where image should go
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em>&#160;:</span></p></td>
<td> Y coordinate on <em class="parameter"><code>drawable</code></em> where image should go
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em>&#160;:</span></p></td>
<td> width of area of image to draw
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em>&#160;:</span></p></td>
<td> height of area of image to draw
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dith</code></em>&#160;:</span></p></td>
<td> dithering mode
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em>&#160;:</span></p></td>
<td> RGB image data
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rowstride</code></em>&#160;:</span></p></td>
<td> rowstride of RGB image data
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xdith</code></em>&#160;:</span></p></td>
<td> X dither offset
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ydith</code></em>&#160;:</span></p></td>
<td> Y dither offset
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id3128135"></a><h3>
<a name="GdkRgbDither"></a>enum GdkRgbDither</h3>
<a class="indexterm" name="id3128147"></a><pre class="programlisting">typedef enum
{
  GDK_RGB_DITHER_NONE,
  GDK_RGB_DITHER_NORMAL,
  GDK_RGB_DITHER_MAX
} GdkRgbDither;
</pre>
<p>
Selects whether or not GdkRGB applies dithering
to the image on display. 
</p>
<p>
Since GdkRGB currently only handles images with 8 bits per component,
dithering on 24 bit per pixel displays is a moot point.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a name="GDK-RGB-DITHER-NONE:CAPS"></a><code class="literal">GDK_RGB_DITHER_NONE</code></span></p></td>
<td>Never use dithering.
</td>
</tr>
<tr>
<td><p><span class="term"><a name="GDK-RGB-DITHER-NORMAL:CAPS"></a><code class="literal">GDK_RGB_DITHER_NORMAL</code></span></p></td>
<td>Use dithering in 8 bits per pixel (and below)
only.
</td>
</tr>
<tr>
<td><p><span class="term"><a name="GDK-RGB-DITHER-MAX:CAPS"></a><code class="literal">GDK_RGB_DITHER_MAX</code></span></p></td>
<td>Use dithering in 16 bits per pixel and below.

</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id3128245"></a><h3>
<a name="gdk-rgb-cmap-new"></a>gdk_rgb_cmap_new ()</h3>
<a class="indexterm" name="id3128258"></a><pre class="programlisting"><a class="link" href="gdk-GdkRGB.html#GdkRgbCmap">GdkRgbCmap</a>*         gdk_rgb_cmap_new                    (<a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"
>guint32</a> *colors,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"
>gint</a> n_colors);</pre>
<p>
Creates a new <a class="link" href="gdk-GdkRGB.html#GdkRgbCmap"><span class="type">GdkRgbCmap</span></a> structure. The cmap maps color indexes to
RGB colors. If <em class="parameter"><code>n_colors</code></em> is less than 256, then images containing
color values greater than or equal to <em class="parameter"><code>n_colors</code></em> will produce undefined
results, including possibly segfaults.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>colors</code></em>&#160;:</span></p></td>
<td>The colors, represented as 0xRRGGBB integer values.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n_colors</code></em>&#160;:</span></p></td>
<td>The number of colors in the cmap.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span>&#160;:</span></p></td>
<td>The newly created <a class="link" href="gdk-GdkRGB.html#GdkRgbCmap"><span class="type">GdkRgbCmap</span></a>


</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id3128368"></a><h3>
<a name="gdk-rgb-cmap-free"></a>gdk_rgb_cmap_free ()</h3>
<a class="indexterm" name="id3128382"></a><pre class="programlisting">void                gdk_rgb_cmap_free                   (<a class="link" href="gdk-GdkRGB.html#GdkRgbCmap">GdkRgbCmap</a> *cmap);</pre>
<p>
Frees the memory associated with a <a class="link" href="gdk-GdkRGB.html#GdkRgbCmap"><span class="type">GdkRgbCmap</span></a> created by <a class="link" href="gdk-GdkRGB.html#gdk-rgb-cmap-new"><code class="function">gdk_rgb_cmap_new()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>cmap</code></em>&#160;:</span></p></td>
<td>The <a class="link" href="gdk-GdkRGB.html#GdkRgbCmap"><span class="type">GdkRgbCmap</span></a> to free.


</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id3128455"></a><h3>
<a name="GdkRgbCmap"></a>GdkRgbCmap</h3>
<a class="indexterm" name="id3128468"></a><pre class="programlisting">typedef struct {
  guint32 colors[256];
  gint n_colors;
} GdkRgbCmap;
</pre>
<p>
A private data structure which maps color indices to actual RGB
colors. This is used only for <a class="link" href="gdk-GdkRGB.html#gdk-draw-indexed-image"><code class="function">gdk_draw_indexed_image()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"
>guint32</a>&#160;<em class="structfield"><code>colors</code></em>[256];</span></p></td>
<td>The colors, represented as 0xRRGGBB integer values.
</td>
</tr>
<tr>
<td><p><span class="term"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"
>gint</a>&#160;<em class="structfield"><code>n_colors</code></em>;</span></p></td>
<td>The number of colors in the cmap.

</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id3128542"></a><h3>
<a name="gdk-rgb-gc-set-foreground"></a>gdk_rgb_gc_set_foreground ()</h3>
<a class="indexterm" name="id3128559"></a><pre class="programlisting">void                gdk_rgb_gc_set_foreground           (<a class="link" href="gdk-Graphics-Contexts.html#GdkGC">GdkGC</a> *gc,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"
>guint32</a> rgb);</pre>
<div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Warning</h3>
<p><code class="literal">gdk_rgb_gc_set_foreground</code> is deprecated and should not be used in newly-written code.</p>
</div>
<p>
Sets the foreground color in <em class="parameter"><code>gc</code></em> to the specified color (or the
closest approximation, in the case of limited visuals).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>gc</code></em>&#160;:</span></p></td>
<td>The <a class="link" href="gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> to modify.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rgb</code></em>&#160;:</span></p></td>
<td>The color, represented as a 0xRRGGBB integer value.


</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id3128656"></a><h3>
<a name="gdk-rgb-gc-set-background"></a>gdk_rgb_gc_set_background ()</h3>
<a class="indexterm" name="id3128671"></a><pre class="programlisting">void                gdk_rgb_gc_set_background           (<a class="link" href="gdk-Graphics-Contexts.html#GdkGC">GdkGC</a> *gc,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"
>guint32</a> rgb);</pre>
<div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Warning</h3>
<p><code class="literal">gdk_rgb_gc_set_background</code> is deprecated and should not be used in newly-written code.</p>
</div>
<p>
Sets the background color in <em class="parameter"><code>gc</code></em> to the specified color (or the
closest approximation, in the case of limited visuals).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>gc</code></em>&#160;:</span></p></td>
<td>The <a class="link" href="gdk-Graphics-Contexts.html#GdkGC"><span class="type">GdkGC</span></a> to modify.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rgb</code></em>&#160;:</span></p></td>
<td>The color, represented as a 0xRRGGBB integer value.


</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id3128768"></a><h3>
<a name="gdk-rgb-xpixel-from-rgb"></a>gdk_rgb_xpixel_from_rgb ()</h3>
<a class="indexterm" name="id3128783"></a><pre class="programlisting"><a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gulong"
>gulong</a>              gdk_rgb_xpixel_from_rgb             (<a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"
>guint32</a> rgb);</pre>
<div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Warning</h3>
<p><code class="literal">gdk_rgb_xpixel_from_rgb</code> is deprecated and should not be used in newly-written code.</p>
</div>
<p>
Finds the X pixel closest in color to the <em class="parameter"><code>rgb</code></em> color specified. This
value may be used to set the <em class="structfield"><code>pixel</code></em> field of
a <a class="link" href="gdk-Colormaps-and-Colors.html#GdkColor"><span class="type">GdkColor</span></a> struct.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>rgb</code></em>&#160;:</span></p></td>
<td>The color, represented as a 0xRRGGBB integer value.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span>&#160;:</span></p></td>
<td>The X pixel value.


</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">