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background-content: Render background slices relative to actor box

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The current code assumes that the actor will always have the same
size and position of the background texture, but part of the implicit
contract of being a ClutterContent is being able to render itself
at any given actor, at any given size.

For example, if the current code is given an actor with 0x0+100+100
as geometry, and no clipped region, it'll render not the whole
background, but the 0x0+100+100 rectangle of the background. In
practice, the actor geometry acts like a "clip mask" over the
background texture, due to the assumption that the actor will
always have the same size of the monitor.

Make the calculation of the texture slices relative to the actor
box.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1302
This commit is contained in:
Georges Basile Stavracas Neto 2020-06-09 13:52:14 -03:00
parent 6d75b4fc53
commit ca0156e9a7
1 changed files with 11 additions and 6 deletions
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17
src/compositor/meta-background-content.c
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@ -444,21 +444,26 @@ set_glsl_parameters (MetaBackgroundContent *self,
static void
paint_clipped_rectangle (MetaBackgroundContent *self,
ClutterPaintNode *node,
ClutterActorBox *actor_box,
cairo_rectangle_int_t *rect)
{
g_autoptr (ClutterPaintNode) pipeline_node = NULL;
float h_scale, v_scale;
float x1, y1, x2, y2;
float tx1, ty1, tx2, ty2;
h_scale = self->texture_area.width / clutter_actor_box_get_width (actor_box);
v_scale = self->texture_area.height / clutter_actor_box_get_height (actor_box);
x1 = rect->x;
y1 = rect->y;
x2 = rect->x + rect->width;
y2 = rect->y + rect->height;
tx1 = (x1 - self->texture_area.x) / (float)self->texture_area.width;
ty1 = (y1 - self->texture_area.y) / (float)self->texture_area.height;
tx2 = (x2 - self->texture_area.x) / (float)self->texture_area.width;
ty2 = (y2 - self->texture_area.y) / (float)self->texture_area.height;
tx1 = (x1 * h_scale - self->texture_area.x) / (float)self->texture_area.width;
ty1 = (y1 * v_scale - self->texture_area.y) / (float)self->texture_area.height;
tx2 = (x2 * h_scale - self->texture_area.x) / (float)self->texture_area.width;
ty2 = (y2 * v_scale - self->texture_area.y) / (float)self->texture_area.height;
pipeline_node = clutter_pipeline_node_new (self->pipeline);
clutter_paint_node_set_name (pipeline_node, "MetaBackgroundContent (Slice)");
@ -530,14 +535,14 @@ meta_background_content_paint_content (ClutterContent *content,
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (region, i, &rect);
paint_clipped_rectangle (self, node, &rect);
paint_clipped_rectangle (self, node, &actor_box, &rect);
}
}
else
{
cairo_rectangle_int_t rect;
cairo_region_get_extents (region, &rect);
paint_clipped_rectangle (self, node, &rect);
paint_clipped_rectangle (self, node, &actor_box, &rect);
}
cairo_region_destroy (region);