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blur-effect: Don't use stage view when drawing off-stage

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When we're painting off-stage, for example because we're screencasting
or taking a screenshot, there won't be a stage-view associated with the
paint context. The BlurEffect previously didn't handle that case and
would crash.

Fix that and handle that case by assuming the scale is 1 and not
offsetting the rectangle we blit from the draw framebuffer.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1673>
This commit is contained in:
Jonas Dreßler 2021-02-13 16:07:22 +01:00 committed by Robert Mader
parent c592a06911
commit 09602ae2ae
1 changed files with 16 additions and 5 deletions
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17
src/shell-blur-effect.c
View File

@ -327,7 +327,6 @@ update_actor_box (ShellBlurEffect *self,
float box_scale_factor = 1.0f;
float origin_x, origin_y;
float width, height;
cairo_rectangle_int_t stage_view_layout;
switch (self->mode)
{
@ -337,14 +336,26 @@ update_actor_box (ShellBlurEffect *self,
case SHELL_BLUR_MODE_BACKGROUND:
stage_view = clutter_paint_context_get_stage_view (paint_context);
box_scale_factor = clutter_stage_view_get_scale (stage_view);
clutter_stage_view_get_layout (stage_view, &stage_view_layout);
clutter_actor_get_transformed_position (self->actor, &origin_x, &origin_y);
clutter_actor_get_transformed_size (self->actor, &width, &height);
if (stage_view)
{
cairo_rectangle_int_t stage_view_layout;
box_scale_factor = clutter_stage_view_get_scale (stage_view);
clutter_stage_view_get_layout (stage_view, &stage_view_layout);
origin_x -= stage_view_layout.x;
origin_y -= stage_view_layout.y;
}
else
{
/* If we're drawing off stage, just assume scale = 1, this won't work
* with stage-view scaling though.
*/
}
clutter_actor_box_set_origin (source_actor_box, origin_x, origin_y);
clutter_actor_box_set_size (source_actor_box, width, height);