forked from AuroraMiddleware/gtk
6e3522ab2c
2000-01-01 Federico Mena Quintero <federico@helixcode.com> * gdk-pixbuf/gdk-pixbuf.h (GdkPixbufAnimation): Added reference counting to animations. A web browser may want to share a single copy of an animated GIF if it appears multiple times in a web page, for example. * gdk-pixbuf/gdk-pixbuf-animation.c: New file. Moved the animation functions here. (gdk_pixbuf_animation_new_from_file): Prettified. Return a NULL animation if the loader does not support multiframe loading and the single-frame load returned NULL. Check that the filename is not NULL. Updated inline documentation. (gdk_pixbuf_animation_ref): New function. (gdk_pixbuf_animation_unref): New function. Removed gdk_pixbuf_animation_destroy() in favor of reference counting. * gdk-pixbuf/gdk-pixbuf-io.c (gdk_pixbuf_new_from_file): Prettified. Made ref_count assertion more paranoid. Check that the filename is not NULL. (gdk_pixbuf_get_module): Use guchar * and guint for buffer and size, respectively. (gdk_pixbuf_new_from_xpm_data): Changed the "data" argument to const char **. * gdk-pixbuf/io-gif.c (image_load_animation): Create the animation with a reference count of 1. * gdk-pixbuf/Makefile.am (libgdk_pixbuf_la_SOURCES): Added gdk-pixbuf-animation.c. * doc/tmpl/animation.sgml: Populated. It is still missing a description of the overlay modes. * doc/gdk-pixbuf-sections.txt: Added the animation section. Moved the canvas item section to the end, as it will be moved later to gnome-libs. * doc/gdk-pixbuf.sgml: Added the animation section. * doc/Makefile.am (tmpl_sources): Added tmpl/animation.sgml.
115 lines
2.6 KiB
Plaintext
115 lines
2.6 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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Rendering
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<!-- ##### SECTION Short_Description ##### -->
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Rendering a pixbuf to a GDK drawable.
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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The GdkPixbuf library provides several convenience functions to
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render pixbufs to GDK drawables. It uses the GdkRGB to render the
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image data.
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</para>
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<para>
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At this point there is not a standard alpha channel extension for
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the X Window System, so it is not possible to use full opacity
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information when painting images to arbitrary drawables. The
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GdkPixbuf convenience functions will threshold the opacity
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information to create a bi-level clipping mask (black and white),
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and use that to draw the image onto a drawable.
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</para>
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<important>
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<para>
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Since these functions use GdkRGB for rendering, you must
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initialize GdkRGB before using any of them. You can do this by
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calling gdk_rgb_init() near the beginning of your program.
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</para>
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</important>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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GdkRGB
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</para>
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<!-- ##### ENUM GdkPixbufAlphaMode ##### -->
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<para>
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These values can be passed to
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gdk_pixbuf_render_to_drawable_alpha() to control how the alpha
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chanel of an image should be handled. This function can create a
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bilevel clipping mask (black and white) and use it while painting
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the image. In the future, when the X Window System gets an alpha
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channel extension, it will be possible to do full alpha
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compositing onto arbitrary drawables. For now both cases fall
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back to a bilevel clipping mask.
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</para>
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@GDK_PIXBUF_ALPHA_BILEVEL: A bilevel clipping mask (black and white)
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will be created and used to draw the image. Pixels below 0.5 opacity
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will be considered fully transparent, and all others will be
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considered fully opaque.
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@GDK_PIXBUF_ALPHA_FULL: For now falls back to #GDK_PIXBUF_ALPHA_BILEVEL.
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In the future it will do full alpha compositing.
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<!-- ##### FUNCTION gdk_pixbuf_render_to_drawable_alpha ##### -->
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<para>
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</para>
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@pixbuf:
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@drawable:
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@src_x:
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@src_y:
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@dest_x:
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@dest_y:
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@width:
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@height:
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@alpha_mode:
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@alpha_threshold:
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@dither:
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@x_dither:
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@y_dither:
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<!-- ##### FUNCTION gdk_pixbuf_render_to_drawable ##### -->
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<para>
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</para>
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@pixbuf:
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@drawable:
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@gc:
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@src_x:
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@src_y:
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@dest_x:
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@dest_y:
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@width:
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@height:
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@dither:
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@x_dither:
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@y_dither:
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<!-- ##### FUNCTION gdk_pixbuf_render_threshold_alpha ##### -->
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<para>
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</para>
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@pixbuf:
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@bitmap:
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@src_x:
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@src_y:
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@dest_x:
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@dest_y:
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@width:
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@height:
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@alpha_threshold: <!--
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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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