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actor: documents _get/apply_relative_transform_matrix

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Although this patch doesn't make them public, it documents the
_clutter_actor_get/apply_relative_transform_matrix functions so they
could easily be made public if desired. I think these API could be
useful to have publicly, and I originally documented them because I
thought they would be needed in the MX toolkit.
This commit is contained in:
Robert Bragg 2011-06-17 18:27:45 +01:00
parent 87d55ffcfa
commit b66c22ac1c
4 changed files with 79 additions and 33 deletions
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6
clutter/clutter-actor-private.h
View File

@ -121,9 +121,9 @@ ClutterActor *_clutter_actor_get_stage_internal (ClutterActor *actor);
void _clutter_actor_apply_modelview_transform (ClutterActor *self,
CoglMatrix *matrix);
void _clutter_actor_apply_modelview_transform_recursive (ClutterActor *self,
ClutterActor *ancestor,
CoglMatrix *matrix);
void _clutter_actor_apply_relative_transformation_matrix (ClutterActor *self,
ClutterActor *ancestor,
CoglMatrix *matrix);
void _clutter_actor_rerealize (ClutterActor *self,
ClutterCallback callback,

92
clutter/clutter-actor.c
View File

@ -683,9 +683,9 @@ static gboolean clutter_anchor_coord_is_zero (const AnchorCoord *coord);
static void _clutter_actor_queue_only_relayout (ClutterActor *self);
static void _clutter_actor_get_relative_modelview (ClutterActor *self,
ClutterActor *ancestor,
CoglMatrix *matrix);
static void _clutter_actor_get_relative_transformation_matrix (ClutterActor *self,
ClutterActor *ancestor,
CoglMatrix *matrix);
static ClutterPaintVolume *_clutter_actor_get_paint_volume_mutable (ClutterActor *self);
@ -2029,7 +2029,7 @@ clutter_actor_apply_relative_transform_to_point (ClutterActor *self,
return;
}
_clutter_actor_get_relative_modelview (self, ancestor, &matrix);
_clutter_actor_get_relative_transformation_matrix (self, ancestor, &matrix);
cogl_matrix_transform_point (&matrix, &vertex->x, &vertex->y, &vertex->z, &w);
}
@ -2056,7 +2056,7 @@ _clutter_actor_fully_transform_vertices (ClutterActor *self,
/* Note: we pass NULL as the ancestor because we don't just want the modelview
* that gets us to stage coordinates, we want to go all the way to eye
* coordinates */
_clutter_actor_apply_modelview_transform_recursive (self, NULL, &modelview);
_clutter_actor_apply_relative_transformation_matrix (self, NULL, &modelview);
/* Fetch the projection and viewport */
_clutter_stage_get_projection_matrix (CLUTTER_STAGE (stage), &projection);
@ -2098,21 +2098,43 @@ clutter_actor_apply_transform_to_point (ClutterActor *self,
_clutter_actor_fully_transform_vertices (self, point, vertex, 1);
}
/* _clutter_actor_get_relative_modelview:
/*
* _clutter_actor_get_relative_transformation_matrix:
* @self: The actor whose coordinate space you want to transform from.
* @ancestor: The ancestor actor whose coordinate space you want to transform too
* or %NULL if you want to transform all the way to eye coordinates.
* @matrix: A #CoglMatrix to store the transformation
*
* This gets a transformation @matrix that will transform coordinates from the
* coordinate space of @self into the coordinate space of @ancestor.
*
* For example if you need a matrix that can transform the local actor
* coordinates of @self into stage coordinates you would pass the actor's stage
* pointer as the @ancestor.
*
* If you pass %NULL then the transformation will take you all the way through
* to eye coordinates. This can be useful if you want to extract the entire
* modelview transform that Clutter applies before applying the projection
* transformation. If you want to explicitly set a modelview on a CoglFramebuffer
* using cogl_set_modelview_matrix() for example then you would want a matrix
* that transforms into eye coordinates.
*
* <note>This function explicitly initializes the given @matrix. If you just
* want clutter to multiply a relative transformation with an existing matrix
* you can use clutter_actor_apply_relative_transformation_matrix() instead.
* </note>
*
* Retrieves the modelview transformation relative to some ancestor
* actor, or eye coordinates if NULL is given for the ancestor.
*/
/* FIXME: We should be caching the stage relative modelview along with the
* actor itself */
/* XXX: We should consider caching the stage relative modelview along with
* the actor itself */
static void
_clutter_actor_get_relative_modelview (ClutterActor *self,
ClutterActor *ancestor,
CoglMatrix *matrix)
_clutter_actor_get_relative_transformation_matrix (ClutterActor *self,
ClutterActor *ancestor,
CoglMatrix *matrix)
{
cogl_matrix_init_identity (matrix);
_clutter_actor_apply_modelview_transform_recursive (self, ancestor, matrix);
_clutter_actor_apply_relative_transformation_matrix (self, ancestor, matrix);
}
/* Project the given @box into stage window coordinates, writing the
@ -2220,7 +2242,8 @@ clutter_actor_get_allocation_vertices (ClutterActor *self,
vertices[3].y = box.y2;
vertices[3].z = 0;
_clutter_actor_get_relative_modelview (self, ancestor, &modelview);
_clutter_actor_get_relative_transformation_matrix (self, ancestor,
&modelview);
cogl_matrix_transform_points (&modelview,
3,
@ -2366,14 +2389,37 @@ _clutter_actor_apply_modelview_transform (ClutterActor *self,
CLUTTER_ACTOR_GET_CLASS (self)->apply_transform (self, matrix);
}
/* Recursively applies the transforms associated with this actor and
* its ancestors to the given matrix. Use NULL if you want this
* to go all the way down to the stage.
/*
* clutter_actor_apply_relative_transformation_matrix:
* @self: The actor whose coordinate space you want to transform from.
* @ancestor: The ancestor actor whose coordinate space you want to transform too
* or %NULL if you want to transform all the way to eye coordinates.
* @matrix: A #CoglMatrix to apply the transformation too.
*
* This multiplies a transform with @matrix that will transform coordinates
* from the coordinate space of @self into the coordinate space of @ancestor.
*
* For example if you need a matrix that can transform the local actor
* coordinates of @self into stage coordinates you would pass the actor's stage
* pointer as the @ancestor.
*
* If you pass %NULL then the transformation will take you all the way through
* to eye coordinates. This can be useful if you want to extract the entire
* modelview transform that Clutter applies before applying the projection
* transformation. If you want to explicitly set a modelview on a CoglFramebuffer
* using cogl_set_modelview_matrix() for example then you would want a matrix
* that transforms into eye coordinates.
*
* <note>This function doesn't initialize the given @matrix, it simply
* multiplies the requested transformation matrix with the existing contents of
* @matrix. You can use cogl_matrix_init_identity() to initialize the @matrix
* before calling this function, or you can use
* clutter_actor_get_relative_transformation_matrix() instead.</note>
*/
void
_clutter_actor_apply_modelview_transform_recursive (ClutterActor *self,
ClutterActor *ancestor,
CoglMatrix *matrix)
_clutter_actor_apply_relative_transformation_matrix (ClutterActor *self,
ClutterActor *ancestor,
CoglMatrix *matrix)
{
ClutterActor *parent;
@ -2387,8 +2433,8 @@ _clutter_actor_apply_modelview_transform_recursive (ClutterActor *self,
parent = clutter_actor_get_parent (self);
if (parent != NULL)
_clutter_actor_apply_modelview_transform_recursive (parent, ancestor,
matrix);
_clutter_actor_apply_relative_transformation_matrix (parent, ancestor,
matrix);
_clutter_actor_apply_modelview_transform (self, matrix);
}

8
clutter/clutter-paint-volume.c
View File

@ -1008,8 +1008,8 @@ _clutter_paint_volume_get_stage_paint_box (ClutterPaintVolume *pv,
/* If the paint volume isn't already in eye coordinates... */
if (pv->actor)
_clutter_actor_apply_modelview_transform_recursive (pv->actor, NULL,
&modelview);
_clutter_actor_apply_relative_transformation_matrix (pv->actor, NULL,
&modelview);
_clutter_stage_get_projection_matrix (stage, &projection);
_clutter_stage_get_viewport (stage,
@ -1043,8 +1043,8 @@ _clutter_paint_volume_transform_relative (ClutterPaintVolume *pv,
_clutter_paint_volume_set_reference_actor (pv, relative_to_ancestor);
cogl_matrix_init_identity (&matrix);
_clutter_actor_apply_modelview_transform_recursive (actor,
relative_to_ancestor,
_clutter_actor_apply_relative_transformation_matrix (actor,
relative_to_ancestor,
&matrix);
_clutter_paint_volume_transform (pv, &matrix);

6
clutter/clutter-texture.c
View File

@ -531,9 +531,9 @@ update_fbo (ClutterActor *self)
{
CoglMatrix modelview;
cogl_matrix_init_identity (&modelview);
_clutter_actor_apply_modelview_transform_recursive (source_parent,
NULL,
&modelview);
_clutter_actor_apply_relative_transformation_matrix (source_parent,
NULL,
&modelview);
cogl_set_modelview_matrix (&modelview);
}
}