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Factor out meta_actor_painting_untransformed()

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The painting_untransformed() function in MetaWindowGroup is useful
elsewhere, in particular if we want to check whether we can avoid
bilinear filtering when painting a texture 1:1.

https://bugzilla.gnome.org/show_bug.cgi?id=735632
This commit is contained in:
Owen W. Taylor 2014-08-27 12:44:26 -04:00
parent 09aefdba43
commit 786f358888
3 changed files with 79 additions and 59 deletions
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70
src/compositor/clutter-utils.c
View File

@ -51,6 +51,12 @@ round_to_fixed (float x)
return roundf (x * 256);
}
/* Help macros to scale from OpenGL <-1,1> coordinates system to
* window coordinates ranging [0,window-size]. Borrowed from clutter-utils.c
*/
#define MTX_GL_SCALE_X(x,w,v1,v2) ((((((x) / (w)) + 1.0f) / 2.0f) * (v1)) + (v2))
#define MTX_GL_SCALE_Y(y,w,v1,v2) ((v1) - (((((y) / (w)) + 1.0f) / 2.0f) * (v1)) + (v2))
/* This helper function checks if (according to our fixed point precision)
* the vertices @verts form a box of width @widthf and height @heightf
* located at integral coordinates. These coordinates are returned
@ -118,3 +124,67 @@ meta_actor_is_untransformed (ClutterActor *actor,
return meta_actor_vertices_are_untransformed (verts, widthf, heightf, x_origin, y_origin);
}
/**
* meta_actor_painting_untransformed:
* @paint_width: the width of the painted area
* @paint_height: the height of the painted area
* @x_origin: if the transform is only an integer translation
* then the X coordinate of the location of the origin under the transformation
* from drawing space to screen pixel space is returned here.
* @y_origin: if the transform is only an integer translation
* then the X coordinate of the location of the origin under the transformation
* from drawing space to screen pixel space is returned here.
*
* Determines if the current painting transform is an integer translation.
* This can differ from the result of meta_actor_is_untransformed() when
* painting an actor if we're inside a inside a clone paint. @paint_width
* and @paint_height are used to determine the vertices of the rectangle
* we check to see if the painted area is "close enough" to the integer
* transform.
*/
gboolean
meta_actor_painting_untransformed (int paint_width,
int paint_height,
int *x_origin,
int *y_origin)
{
CoglMatrix modelview, projection, modelview_projection;
ClutterVertex vertices[4];
float viewport[4];
int i;
cogl_get_modelview_matrix (&modelview);
cogl_get_projection_matrix (&projection);
cogl_matrix_multiply (&modelview_projection,
&projection,
&modelview);
vertices[0].x = 0;
vertices[0].y = 0;
vertices[0].z = 0;
vertices[1].x = paint_width;
vertices[1].y = 0;
vertices[1].z = 0;
vertices[2].x = 0;
vertices[2].y = paint_height;
vertices[2].z = 0;
vertices[3].x = paint_width;
vertices[3].y = paint_height;
vertices[3].z = 0;
cogl_get_viewport (viewport);
for (i = 0; i < 4; i++)
{
float w = 1;
cogl_matrix_transform_point (&modelview_projection, &vertices[i].x, &vertices[i].y, &vertices[i].z, &w);
vertices[i].x = MTX_GL_SCALE_X (vertices[i].x, w,
viewport[2], viewport[0]);
vertices[i].y = MTX_GL_SCALE_Y (vertices[i].y, w,
viewport[3], viewport[1]);
}
return meta_actor_vertices_are_untransformed (vertices, paint_width, paint_height, x_origin, y_origin);
}

5
src/compositor/clutter-utils.h
View File

@ -31,4 +31,9 @@ gboolean meta_actor_is_untransformed (ClutterActor *actor,
int *x_origin,
int *y_origin);
gboolean meta_actor_painting_untransformed (int paint_width,
int paint_height,
int *x_origin,
int *y_origin);
#endif /* __META_CLUTTER_UTILS_H__ */

63
src/compositor/meta-window-group.c
View File

@ -31,64 +31,6 @@ static void cullable_iface_init (MetaCullableInterface *iface);
G_DEFINE_TYPE_WITH_CODE (MetaWindowGroup, meta_window_group, CLUTTER_TYPE_ACTOR,
G_IMPLEMENT_INTERFACE (META_TYPE_CULLABLE, cullable_iface_init));
/* Help macros to scale from OpenGL <-1,1> coordinates system to
* window coordinates ranging [0,window-size]. Borrowed from clutter-utils.c
*/
#define MTX_GL_SCALE_X(x,w,v1,v2) ((((((x) / (w)) + 1.0f) / 2.0f) * (v1)) + (v2))
#define MTX_GL_SCALE_Y(y,w,v1,v2) ((v1) - (((((y) / (w)) + 1.0f) / 2.0f) * (v1)) + (v2))
/* Check if we're painting the MetaWindowGroup "untransformed". This can
* differ from the result of actor_is_untransformed(window_group) if we're
* inside a clone paint. The integer translation, if any, is returned.
*/
static gboolean
painting_untransformed (MetaWindowGroup *window_group,
int *x_origin,
int *y_origin)
{
CoglMatrix modelview, projection, modelview_projection;
ClutterVertex vertices[4];
int width, height;
float viewport[4];
int i;
cogl_get_modelview_matrix (&modelview);
cogl_get_projection_matrix (&projection);
cogl_matrix_multiply (&modelview_projection,
&projection,
&modelview);
meta_screen_get_size (window_group->screen, &width, &height);
vertices[0].x = 0;
vertices[0].y = 0;
vertices[0].z = 0;
vertices[1].x = width;
vertices[1].y = 0;
vertices[1].z = 0;
vertices[2].x = 0;
vertices[2].y = height;
vertices[2].z = 0;
vertices[3].x = width;
vertices[3].y = height;
vertices[3].z = 0;
cogl_get_viewport (viewport);
for (i = 0; i < 4; i++)
{
float w = 1;
cogl_matrix_transform_point (&modelview_projection, &vertices[i].x, &vertices[i].y, &vertices[i].z, &w);
vertices[i].x = MTX_GL_SCALE_X (vertices[i].x, w,
viewport[2], viewport[0]);
vertices[i].y = MTX_GL_SCALE_Y (vertices[i].y, w,
viewport[3], viewport[1]);
}
return meta_actor_vertices_are_untransformed (vertices, width, height, x_origin, y_origin);
}
static void
meta_window_group_cull_out (MetaCullable *cullable,
cairo_region_t *unobscured_region,
@ -119,10 +61,13 @@ meta_window_group_paint (ClutterActor *actor)
int paint_x_offset, paint_y_offset;
int paint_x_origin, paint_y_origin;
int actor_x_origin, actor_y_origin;
int screen_width, screen_height;
MetaWindowGroup *window_group = META_WINDOW_GROUP (actor);
ClutterActor *stage = clutter_actor_get_stage (actor);
meta_screen_get_size (window_group->screen, &screen_width, &screen_height);
/* Normally we expect an actor to be drawn at it's position on the screen.
* However, if we're inside the paint of a ClutterClone, that won't be the
* case and we need to compensate. We look at the position of the window
@ -136,7 +81,7 @@ meta_window_group_paint (ClutterActor *actor)
* painting currently, and never worry about how actors are positioned
* on the stage.
*/
if (!painting_untransformed (window_group, &paint_x_origin, &paint_y_origin) ||
if (!meta_actor_painting_untransformed (screen_width, screen_height, &paint_x_origin, &paint_y_origin) ||
!meta_actor_is_untransformed (actor, &actor_x_origin, &actor_y_origin))
{
CLUTTER_ACTOR_CLASS (meta_window_group_parent_class)->paint (actor);