forked from AuroraMiddleware/gtk
99 lines
2.2 KiB
Plaintext
99 lines
2.2 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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Image Data in Memory
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<!-- ##### SECTION Short_Description ##### -->
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Creating a pixbuf from image data that is already in memory.
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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The most basic way to create a pixbuf is to wrap an existing
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#ArtPixBuf structure with a #GdkPixbuf to add reference counting
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capabilities to it. The gdk_pixbuf_new_from_art_pixbuf() performs
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this operation.
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</para>
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<para>
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As a convenience, you can use the gdk_pixbuf_new_from_data()
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function to wrap an existing data buffer with a #GdkPixbuf. You
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need to specify the destroy notification function that will be
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called when the data buffer needs to be freed; this will happen
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when the pixbuf's reference count drops to zero and thus the
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#ArtPixBuf needs to be destroyed. If you have a chunk of static
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data compiled into your application, you can pass in #NULL as the
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destroy notification function so that the data will not be freed.
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</para>
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<para>
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The gdk_pixbuf_new() function can be used as a convenience to
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create a pixbuf with an empty buffer. This is equivalent to
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allocating a data buffer using malloc() and then wrapping it with
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gdk_pixbuf_new_from_data(). The gdk_pixbuf_new() function will
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compute an optimal rowstride so that rendering can be performed
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with an efficient algorithm.
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</para>
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<para>
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As a special case, you can use the gdk_pixbuf_new_from_xpm_data()
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function to create a pixbuf from inline XPM image data.
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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#ArtPixBuf
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</para>
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<!-- ##### FUNCTION gdk_pixbuf_new_from_art_pixbuf ##### -->
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<para>
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</para>
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@art_pixbuf:
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@Returns:
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<!-- ##### FUNCTION gdk_pixbuf_new ##### -->
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<para>
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</para>
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@format:
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@has_alpha:
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@bits_per_sample:
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@width:
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@height:
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@Returns:
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<!-- ##### FUNCTION gdk_pixbuf_new_from_data ##### -->
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<para>
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</para>
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@data:
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@format:
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@has_alpha:
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@width:
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@height:
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@rowstride:
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@dfunc:
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@dfunc_data:
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@Returns:
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<!-- ##### FUNCTION gdk_pixbuf_new_from_xpm_data ##### -->
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<para>
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</para>
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@data:
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@Returns:
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<!--
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Local variables:
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mode: sgml
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sgml-parent-document: ("../gdk-pixbuf.sgml" "book" "refsect2" "")
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End:
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-->
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