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<H1>../gegl/operation/gegl-operation.h</H1>
<PRE>
<I><FONT COLOR="#B22222">/* This file is part of GEGL
*
* GEGL is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* GEGL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2003 Calvin Williamson
* 2005-2008 Øyvind Kolås
*/</FONT></I>
#<B><FONT COLOR="#5F9EA0">ifndef</FONT></B> <FONT COLOR="#B8860B">__GEGL_OPERATION_H__</FONT>
#<B><FONT COLOR="#5F9EA0">define</FONT></B> <FONT COLOR="#B8860B">__GEGL_OPERATION_H__</FONT>
#<B><FONT COLOR="#5F9EA0">include</FONT></B> <B><FONT COLOR="#BC8F8F"><glib-object.h></FONT></B>
#<B><FONT COLOR="#5F9EA0">include</FONT></B> <B><FONT COLOR="#BC8F8F"><babl/babl.h></FONT></B>
#<B><FONT COLOR="#5F9EA0">include</FONT></B> <B><FONT COLOR="#BC8F8F">"gegl-buffer.h"</FONT></B>
G_BEGIN_DECLS
#<B><FONT COLOR="#5F9EA0">define</FONT></B> <FONT COLOR="#B8860B">GEGL_TYPE_OPERATION</FONT> (gegl_operation_get_type ())
#<B><FONT COLOR="#5F9EA0">define</FONT></B> <B><FONT COLOR="#0000FF">GEGL_OPERATION</FONT></B>(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GEGL_TYPE_OPERATION, GeglOperation))
#<B><FONT COLOR="#5F9EA0">define</FONT></B> <B><FONT COLOR="#0000FF">GEGL_OPERATION_CLASS</FONT></B>(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GEGL_TYPE_OPERATION, GeglOperationClass))
#<B><FONT COLOR="#5F9EA0">define</FONT></B> <B><FONT COLOR="#0000FF">GEGL_IS_OPERATION</FONT></B>(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GEGL_TYPE_OPERATION))
#<B><FONT COLOR="#5F9EA0">define</FONT></B> <B><FONT COLOR="#0000FF">GEGL_IS_OPERATION_CLASS</FONT></B>(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GEGL_TYPE_OPERATION))
#<B><FONT COLOR="#5F9EA0">define</FONT></B> <B><FONT COLOR="#0000FF">GEGL_OPERATION_GET_CLASS</FONT></B>(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GEGL_TYPE_OPERATION, GeglOperationClass))
<B><FONT COLOR="#228B22">typedef</FONT></B> <B><FONT COLOR="#228B22">struct</FONT></B> _GeglOperationClass GeglOperationClass;
<B><FONT COLOR="#228B22">struct</FONT></B> _GeglOperation
{
GObject parent_instance;
<I><FONT COLOR="#B22222">/*< private >*/</FONT></I>
GeglNode *node; <I><FONT COLOR="#B22222">/* the node that this operation object is communicated
with through */</FONT></I>
};
<I><FONT COLOR="#B22222">/***
* GeglOperation:
*
* All the image processing code in GEGL is implemented as GeglOperations,
* GEGL operations are implemented as GObject with a convenience API called
* chanting that abstracts away the boiler plater needed to generate introspectable
* named properties of different types.
*
* Most types of operations like: filters, composers, sources, sinks, point
* operations, compositing operations, and spatial operations with fixed
* neighbourhoods. These base classes build on top of the GeglOperationsClass:
*
* See <a href='gegl-plugin.h.html'>gegl-plugin.h</a> for details.
*/</FONT></I>
<I><FONT COLOR="#B22222">/* the level at which is being operated is stored in the context,
*/</FONT></I>
<B><FONT COLOR="#228B22">struct</FONT></B> _GeglOperationClass
{
GObjectClass parent_class;
<B><FONT COLOR="#228B22">const</FONT></B> gchar *name; <I><FONT COLOR="#B22222">/* name(string) used to create/identify
this type of operation in GEGL, should be
set through gegl_operation_class_set_key(s) */</FONT></I>
<B><FONT COLOR="#228B22">const</FONT></B> gchar *compat_name; <I><FONT COLOR="#B22222">/* allows specifying an alias that the op is
also known as */</FONT></I>
GHashTable *keys; <I><FONT COLOR="#B22222">/* hashtable used for storing meta-data about an op */</FONT></I>
guint no_cache :1; <I><FONT COLOR="#B22222">/* do not create a cache for this operation */</FONT></I>
guint opencl_support:1;
guint64 bit_pad:62;
<I><FONT COLOR="#B22222">/* attach this operation with a GeglNode, override this if you are creating a
* GeglGraph, it is already defined for Filters/Sources/Composers.
*/</FONT></I>
<B><FONT COLOR="#228B22">void</FONT></B> (*attach) (GeglOperation *operation);
<I><FONT COLOR="#B22222">/* Initialize the operation, prepare is called when all properties are
* known but before processing will begin. Prepare will be invoked one
* or multiple times prior to processing.
*/</FONT></I>
<B><FONT COLOR="#228B22">void</FONT></B> (*prepare) (GeglOperation *operation);
<I><FONT COLOR="#B22222">/* The bounding rectangle for the data that is defined by this op.
*/</FONT></I>
GeglRectangle (*get_bounding_box) (GeglOperation *operation);
<I><FONT COLOR="#B22222">/* The output region that is made invalid by a change in the input_roi
* rectangle of the buffer passed in on the pad input_pad. Defaults to
* returning the input_roi.
*/</FONT></I>
GeglRectangle (*get_invalidated_by_change) (GeglOperation *operation,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *input_pad,
<B><FONT COLOR="#228B22">const</FONT></B> GeglRectangle *input_roi);
<I><FONT COLOR="#B22222">/* The rectangle needed to be correctly computed in a buffer on the named
* input_pad, for a given region of interest. Defaults to return the
* output_roi.
*/</FONT></I>
GeglRectangle (*get_required_for_output) (GeglOperation *operation,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *input_pad,
<B><FONT COLOR="#228B22">const</FONT></B> GeglRectangle *output_roi);
<I><FONT COLOR="#B22222">/* The rectangular area that should be processed in one go, by default if not
* defined the output roi would be returned. This is useful for file loaders
* and operations like contrast stretching which is a point operation but we
* need the parameters as the minimum/maximum values in the entire input buffer.
*/</FONT></I>
GeglRectangle (*get_cached_region) (GeglOperation *operation,
<B><FONT COLOR="#228B22">const</FONT></B> GeglRectangle *output_roi);
<I><FONT COLOR="#B22222">/* Compute the rectangular region output roi for the specified output_pad.
* For operations that are sinks (have no output pads), roi is the rectangle
* to consume and the output_pad argument is to be ignored.
*/</FONT></I>
gboolean (*process) (GeglOperation *operation,
GeglOperationContext *context,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *output_pad,
<B><FONT COLOR="#228B22">const</FONT></B> GeglRectangle *roi,
gint level);
<I><FONT COLOR="#B22222">/* The node providing data for a specific location within the operations
* output. The node is responsible for delegating blame to one of it's
* inputs taking into account opacity and similar issues.
*
* XXX: What is GeglNode doing in this part of the API?,
* perhaps we should only point out which pad the data is coming from?
*/</FONT></I>
GeglNode* (*detect) (GeglOperation *operation,
gint x,
gint y);
gpointer pad[10];
};
GType <B><FONT COLOR="#0000FF">gegl_operation_get_type</FONT></B> (<B><FONT COLOR="#228B22">void</FONT></B>) G_GNUC_CONST;
GeglRectangle gegl_operation_get_invalidated_by_change
(GeglOperation *operation,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *input_pad,
<B><FONT COLOR="#228B22">const</FONT></B> GeglRectangle *roi);
GeglRectangle <B><FONT COLOR="#0000FF">gegl_operation_get_bounding_box</FONT></B> (GeglOperation *operation);
<I><FONT COLOR="#B22222">/* retrieves the bounding box of an input pad */</FONT></I>
GeglRectangle * gegl_operation_source_get_bounding_box
(GeglOperation *operation,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *pad_name);
GeglRectangle gegl_operation_get_cached_region
(GeglOperation *operation,
<B><FONT COLOR="#228B22">const</FONT></B> GeglRectangle *roi);
GeglRectangle gegl_operation_get_required_for_output
(GeglOperation *operation,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *input_pad,
<B><FONT COLOR="#228B22">const</FONT></B> GeglRectangle *roi);
GeglNode *<B><FONT COLOR="#0000FF">gegl_operation_detect</FONT></B> (GeglOperation *operation,
gint x,
gint y);
<I><FONT COLOR="#B22222">/* virtual method invokers that change behavior based on the roi being computed,
* needs a context_id being based that is used for storing context data.
*/</FONT></I>
<B><FONT COLOR="#228B22">void</FONT></B> <B><FONT COLOR="#0000FF">gegl_operation_attach</FONT></B> (GeglOperation *operation,
GeglNode *node);
<B><FONT COLOR="#228B22">void</FONT></B> <B><FONT COLOR="#0000FF">gegl_operation_prepare</FONT></B> (GeglOperation *operation);
gboolean <B><FONT COLOR="#0000FF">gegl_operation_process</FONT></B> (GeglOperation *operation,
GeglOperationContext *context,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *output_pad,
<B><FONT COLOR="#228B22">const</FONT></B> GeglRectangle *roi,
gint level);
<I><FONT COLOR="#B22222">/* create a pad for a specified property for this operation, this method is
* to be called from the attach method of operations, most operations do not
* have to care about this since a super class like filter, sink, source or
* composer already does so.
*/</FONT></I>
<B><FONT COLOR="#228B22">void</FONT></B> <B><FONT COLOR="#0000FF">gegl_operation_create_pad</FONT></B> (GeglOperation *operation,
GParamSpec *param_spec);
<I><FONT COLOR="#B22222">/* specify the bablformat for a pad on this operation (XXX: document when
* this is legal, at the moment, only used internally in some ops,. but might
* turn into a global mechanism) */</FONT></I>
<B><FONT COLOR="#228B22">void</FONT></B> <B><FONT COLOR="#0000FF">gegl_operation_set_format</FONT></B> (GeglOperation *operation,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *pad_name,
<B><FONT COLOR="#228B22">const</FONT></B> Babl *format);
<B><FONT COLOR="#228B22">const</FONT></B> Babl * <B><FONT COLOR="#0000FF">gegl_operation_get_format</FONT></B> (GeglOperation *operation,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *pad_name);
<B><FONT COLOR="#228B22">const</FONT></B> gchar * <B><FONT COLOR="#0000FF">gegl_operation_get_name</FONT></B> (GeglOperation *operation);
<I><FONT COLOR="#B22222">/* retrieves the node providing data to a named input pad */</FONT></I>
GeglNode * <B><FONT COLOR="#0000FF">gegl_operation_get_source_node</FONT></B> (GeglOperation *operation,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *pad_name);
GParamSpec ** <B><FONT COLOR="#0000FF">gegl_operation_list_properties</FONT></B> (<B><FONT COLOR="#228B22">const</FONT></B> gchar *operation_type,
guint *n_properties_p);
<I><FONT COLOR="#B22222">/* API to change */</FONT></I>
<B><FONT COLOR="#228B22">void</FONT></B> <B><FONT COLOR="#0000FF">gegl_operation_class_set_key</FONT></B> (GeglOperationClass *klass,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *key_name,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *key_value);
<B><FONT COLOR="#228B22">const</FONT></B> gchar * <B><FONT COLOR="#0000FF">gegl_operation_class_get_key</FONT></B> (GeglOperationClass *operation_class,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *key_name);
<B><FONT COLOR="#228B22">void</FONT></B> <B><FONT COLOR="#0000FF">gegl_operation_class_set_keys</FONT></B> (GeglOperationClass *klass,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *key_name,
...);
gchar ** <B><FONT COLOR="#0000FF">gegl_operation_list_keys</FONT></B> (<B><FONT COLOR="#228B22">const</FONT></B> gchar *operation_type,
guint *n_keys);
<B><FONT COLOR="#228B22">void</FONT></B> <B><FONT COLOR="#0000FF">gegl_operation_set_key</FONT></B> (<B><FONT COLOR="#228B22">const</FONT></B> gchar *operation_type,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *key_name,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *key_value);
<B><FONT COLOR="#228B22">const</FONT></B> gchar * <B><FONT COLOR="#0000FF">gegl_operation_get_key</FONT></B> (<B><FONT COLOR="#228B22">const</FONT></B> gchar *operation_type,
<B><FONT COLOR="#228B22">const</FONT></B> gchar *key_name);
<I><FONT COLOR="#B22222">/* invalidate a specific rectangle, indicating the any computation depending
* on this roi is now invalid.
*
* @roi : the region to blank or NULL for the nodes current have_rect
* @clear_cache: whether any present caches should be zeroed out
*/</FONT></I>
<B><FONT COLOR="#228B22">void</FONT></B> <B><FONT COLOR="#0000FF">gegl_operation_invalidate</FONT></B> (GeglOperation *operation,
<B><FONT COLOR="#228B22">const</FONT></B> GeglRectangle *roi,
gboolean clear_cache);
<I><FONT COLOR="#B22222">/* internal utility functions used by gegl, these should not be used
* externally */</FONT></I>
gboolean <B><FONT COLOR="#0000FF">gegl_operation_calc_need_rects</FONT></B> (GeglOperation *operation,
gpointer context_id);
<B><FONT COLOR="#228B22">void</FONT></B> <B><FONT COLOR="#0000FF">gegl_operation_path_prop_changed</FONT></B> (GeglPath *path,
GeglOperation *operation);
G_END_DECLS
<I><FONT COLOR="#B22222">/***
*/</FONT></I>
#<B><FONT COLOR="#5F9EA0">endif</FONT></B> <I><FONT COLOR="#B22222">/* __GEGL_OPERATION_H__ */</FONT></I>
</PRE>
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