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Your eyes are bloodshot. Your mouth starts to foam. Your hands are shaking. You know your need your fix. NEED MORE ABSTRACTION! 2000-04-12 Federico Mena Quintero <federico@helixcode.com> This comes from an excellent idea by Tim Janik (timj@gtk.org) to hook to the last unref operation. * gdk-pixbuf/gdk-pixbuf.c (gdk_pixbuf_set_last_unref_handler): New function to set the last unref handler for a pixbuf. (gdk_pixbuf_finalize): New function to actually finalize a pixbuf. It calls the pixbuf's destroy notification function and frees the GdkPixbuf structure itself. (gdk_pixbuf_unref): Use the last unref function of the pixbuf if available. * gdk-pixbuf/gdk-pixbuf-private.h (struct _GdkPixbuf): New fields for the last unref handler and its user data. * gdk-pixbuf/gdk-pixbuf-data.c (gdk_pixbuf_new_from_data): Use g_new0() to allocate the pixbuf. * gdk-pixbuf/gdk-pixbuf-loader.c (gdk_pixbuf_loader_class_init): Fixed the call to gtk_signal_new() for the "frame_done" signal; it was not specifying the `frame' argument. * gdk-pixbuf/gdk-pixbuf-animation.c (gdk_pixbuf_animation_get_width): Fixed docstring. (gdk_pixbuf_animation_get_height): Likewise. (gdk_pixbuf_animation_get_num_frames): Likewise. (gdk_pixbuf_animation_get_frames): Likewise. * doc/gdk-pixbuf-sections.txt: Updated with the new functions and types. * doc/tmpl/gdk-pixbuf.sgml: Added the description for GdkColorspace. * doc/tmpl/scaling.sgml: Added the description for GdkInterpType. * doc/tmpl/refcounting.sgml: Updated with the information about the last unref handler. * doc/tmpl/*.sgml: Markup tweaks. * gdk-pixbuf/Makefile.am (libgnomecanvaspixbuf_la_LDFLAGS): Sigh, update the libtool version number for libgnomecanvaspixbuf as well. (libpixbufloader_*_la_LDFLAGS): The loaders need to be versioned as well, or the old ones won't work with the new stuff. Also, renamed the modules as follows. * gdk-pixbuf/gdk-pixbuf-io.c (gdk_pixbuf_load_module): Now the modules are called "libpixbufloader-<format>.so" instead of "libpixbuf-<format>.so". They needed renaming so that the new loaders won't overwrite the old ones; even with the versioning stuff, the new .so symlink to the .so.1.0.0 would overwrite the old real .so file.
127 lines
2.8 KiB
Plaintext
127 lines
2.8 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 <application>gdk-pixbuf</application> library provides several
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convenience functions to render pixbufs to GDK drawables. It uses
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the GdkRGB to render the 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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<application>gdk-pixbuf</application> convenience functions will
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threshold the opacity information to create a bi-level clipping
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mask (black and white), and use that to draw the image onto a
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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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<!-- ##### FUNCTION gdk_pixbuf_render_pixmap_and_mask ##### -->
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<para>
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</para>
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@pixbuf:
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@pixmap_return:
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@mask_return:
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@alpha_threshold:
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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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