forked from AuroraMiddleware/gtk
9d8e5e0ba8
2001-11-03 Sebastian Wilhelmi <wilhelmi@ira.uka.de> * gdk-pixbuf/tmpl/refcounting.sgml, gdk-pixbuf/porting-from-imlib.sgml, tmpl/creating.sgml: gdk_rgb_init() doesn't need to be called anymore. Use g_object_(un)_ref instead of gdk_pixbuf_(un)ref. * tmpl/module_interface.sgml: Typo fix. * gdk-pixbuf/gdk-pixbuf.sgml: Fixed jade complaining about '_' by replacing it with '-'. Now builds again. * gdk-pixbuf-loader.c, gdk-pixbuf-scale.c: Documentation fixes.
127 lines
2.6 KiB
Plaintext
127 lines
2.6 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 pixel
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buffer with a #GdkPixbuf structure. You can use the
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gdk_pixbuf_new_from_data() function to do this You need to specify
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the destroy notification function that will be called when the
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data buffer needs to be freed; this will happen when a #GdkPixbuf
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is finalized by the reference counting functions If you have a
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chunk of static data compiled into your application, you can pass
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in #NULL as the destroy notification function so that the data
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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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<para>
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You can also copy an existing pixbuf with the gdk_pixbuf_copy()
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function. This is not the same as just doing a g_object_ref()
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on the old pixbuf; the copy function will actually duplicate the
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pixel data in memory and create a new #GdkPixbuf structure for it.
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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gdk_pixbuf_finalize().
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</para>
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<!-- ##### FUNCTION gdk_pixbuf_new ##### -->
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<para>
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</para>
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@colorspace:
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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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@colorspace:
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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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@rowstride:
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@destroy_fn:
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@destroy_fn_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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<!-- ##### FUNCTION gdk_pixbuf_new_from_inline ##### -->
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<para>
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</para>
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@data_length:
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@data:
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@copy_pixels:
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@error:
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@Returns:
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<!-- # Unused Parameters # -->
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@inline_pixbuf:
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@length:
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<!-- ##### FUNCTION gdk_pixbuf_new_subpixbuf ##### -->
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<para>
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</para>
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@src_pixbuf:
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@src_x:
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@src_y:
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@width:
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@height:
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@Returns:
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<!-- ##### FUNCTION gdk_pixbuf_copy ##### -->
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<para>
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</para>
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@pixbuf:
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@Returns: <!--
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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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