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window-actor: Fix screencast with fractionally scaled surfaces

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Instead of using `clutter_actor_get_resource_scale()`, we now deduce the
intended buffer scale from the window by dividing the unscaled size by
the final actor size. This is more correct as while the return value of
`clutter_actor_get_resource_scale()` depends only on the monitor where
the surface resides, the actual scale of the surface is determined
solely by the application itself. `get_resource_scale` will differ from
the actual buffer scale if the application only supports 100% scaling
(Xwayland), or is performing scaling with wp_viewporter (clients using
fractional_scale_v1).

This also fixes a mismatch between the calculated buffer sizes between
`meta_window_actor_get_buffer_bounds` and
`meta_window_actor_blit_to_framebuffer` which causes broken
screencasting for Chromium 114 and later when using the native Ozone
Wayland backend.

Additionally, this commit also changes
`meta_window_actor_blit_to_framebuffer` from using a simple translation
to using an inverted matrix transformation of the transformation matrix
between the parent of the window actor and the surface actor to ensure
maximum sharpness for fractionally scaled windows.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3053>
This commit is contained in:
msizanoen 2023-06-05 21:58:13 +07:00 committed by Marge Bot
parent 742d026479
commit 842f73ac4c
2 changed files with 66 additions and 37 deletions
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10
src/compositor/meta-shaped-texture.c
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@ -1533,8 +1533,11 @@ get_unscaled_size (MetaShapedTexture *stex)
float
meta_shaped_texture_get_unscaled_width (MetaShapedTexture *stex)
{
graphene_size_t unscaled_size;
g_return_val_if_fail (META_IS_SHAPED_TEXTURE (stex), 0);
graphene_size_t unscaled_size = get_unscaled_size (stex);
unscaled_size = get_unscaled_size (stex);
return unscaled_size.width;
}
@ -1548,8 +1551,11 @@ meta_shaped_texture_get_unscaled_width (MetaShapedTexture *stex)
float
meta_shaped_texture_get_unscaled_height (MetaShapedTexture *stex)
{
graphene_size_t unscaled_size;
g_return_val_if_fail (META_IS_SHAPED_TEXTURE (stex), 0);
graphene_size_t unscaled_size = get_unscaled_size (stex);
unscaled_size = get_unscaled_size (stex);
return unscaled_size.height;
}

93
src/compositor/meta-window-actor.c
View file

@ -1118,13 +1118,11 @@ meta_window_actor_get_buffer_bounds (MetaScreenCastWindow *screen_cast_window,
MetaWindowActorPrivate *priv =
meta_window_actor_get_instance_private (window_actor);
MetaShapedTexture *stex;
int buffer_scale;
stex = meta_surface_actor_get_texture (priv->surface);
buffer_scale = meta_shaped_texture_get_buffer_scale (stex);
*bounds = (MetaRectangle) {
.width = meta_shaped_texture_get_width (stex) * buffer_scale,
.height = meta_shaped_texture_get_height (stex) * buffer_scale,
.width = floorf (meta_shaped_texture_get_unscaled_width (stex)),
.height = floorf (meta_shaped_texture_get_unscaled_height (stex)),
};
}
@ -1209,7 +1207,13 @@ meta_window_actor_transform_cursor_position (MetaScreenCastWindow *screen_cast_w
if (out_relative_cursor_position)
{
float resource_scale;
MetaShapedTexture *stex = meta_surface_actor_get_texture (priv->surface);
float unscaled_width = meta_shaped_texture_get_unscaled_width (stex);
float unscaled_height = meta_shaped_texture_get_unscaled_height (stex);
int width = meta_shaped_texture_get_width (stex);
int height = meta_shaped_texture_get_height (stex);
clutter_actor_transform_stage_point (CLUTTER_ACTOR (priv->surface),
cursor_position->x,
@ -1217,10 +1221,10 @@ meta_window_actor_transform_cursor_position (MetaScreenCastWindow *screen_cast_w
&out_relative_cursor_position->x,
&out_relative_cursor_position->y);
resource_scale =
clutter_actor_get_resource_scale (CLUTTER_ACTOR (window_actor));
out_relative_cursor_position->x *= resource_scale;
out_relative_cursor_position->y *= resource_scale;
if (width != 0)
out_relative_cursor_position->x *= unscaled_width / width;
if (height != 0)
out_relative_cursor_position->y *= unscaled_height / height;
}
return TRUE;
@ -1288,54 +1292,73 @@ meta_window_actor_blit_to_framebuffer (MetaScreenCastWindow *screen_cast_window,
CoglFramebuffer *framebuffer)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (screen_cast_window);
MetaWindowActorPrivate *priv =
meta_window_actor_get_instance_private (window_actor);
ClutterActor *actor = CLUTTER_ACTOR (window_actor);
ClutterPaintContext *paint_context;
MetaRectangle scaled_clip;
graphene_rect_t scaled_clip;
CoglColor clear_color;
float resource_scale;
MetaShapedTexture *stex;
graphene_matrix_t transform, inverted_transform;
float width, height;
float x, y;
float unscaled_width, unscaled_height;
if (meta_window_actor_is_destroyed (window_actor))
return FALSE;
clutter_actor_get_size (actor, &width, &height);
if (!priv->surface)
return FALSE;
stex = meta_surface_actor_get_texture (priv->surface);
width = meta_shaped_texture_get_width (stex);
height = meta_shaped_texture_get_height (stex);
if (width == 0 || height == 0)
return FALSE;
resource_scale = clutter_actor_get_resource_scale (actor);
clutter_actor_get_relative_transformation_matrix (CLUTTER_ACTOR (priv->surface),
clutter_actor_get_stage (actor),
&transform);
if (!graphene_matrix_inverse (&transform, &inverted_transform))
return FALSE;
unscaled_width = meta_shaped_texture_get_unscaled_width (stex);
unscaled_height = meta_shaped_texture_get_unscaled_height (stex);
clutter_actor_inhibit_culling (actor);
width = ceilf (width * resource_scale);
height = ceilf (height * resource_scale);
clutter_actor_get_position (actor, &x, &y);
cogl_color_init_from_4ub (&clear_color, 0, 0, 0, 0);
cogl_framebuffer_clear (framebuffer, COGL_BUFFER_BIT_COLOR, &clear_color);
cogl_framebuffer_orthographic (framebuffer, 0, 0, width, height, 0, 1.0);
cogl_framebuffer_set_viewport (framebuffer, 0, 0, width, height);
cogl_framebuffer_orthographic (framebuffer,
0, 0,
unscaled_width, unscaled_height,
0, 1.0);
cogl_framebuffer_set_viewport (framebuffer,
0, 0,
unscaled_width, unscaled_height);
meta_rectangle_scale_double (bounds, resource_scale,
META_ROUNDING_STRATEGY_GROW,
&scaled_clip);
meta_rectangle_intersect (&scaled_clip,
&(MetaRectangle) {
.width = width,
.height = height,
},
&scaled_clip);
scaled_clip = meta_rectangle_to_graphene_rect (bounds);
graphene_rect_scale (&scaled_clip,
unscaled_width / width,
unscaled_height / height,
&scaled_clip);
graphene_rect_intersection (&scaled_clip,
&GRAPHENE_RECT_INIT (0, 0, unscaled_width, unscaled_height),
&scaled_clip);
cogl_framebuffer_push_rectangle_clip (framebuffer,
scaled_clip.x, scaled_clip.y,
scaled_clip.x + scaled_clip.width,
scaled_clip.y + scaled_clip.height);
scaled_clip.origin.x, scaled_clip.origin.y,
scaled_clip.origin.x + scaled_clip.size.width,
scaled_clip.origin.y + scaled_clip.size.height);
cogl_framebuffer_push_matrix (framebuffer);
cogl_framebuffer_scale (framebuffer, resource_scale, resource_scale, 1);
cogl_framebuffer_translate (framebuffer, -x, -y, 0);
cogl_framebuffer_scale (framebuffer,
unscaled_width / width,
unscaled_height / height,
1);
cogl_framebuffer_transform (framebuffer, &inverted_transform);
paint_context =
clutter_paint_context_new_for_framebuffer (framebuffer, NULL,