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window-actor: Clip before translate when blitting

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cogl_framebuffer_push_rectangle_clip() acts on the current modelview
matrix. That means the result of clipping then translating will be
different of the result of translating then clipping.

What we want for window screencasting is the former, not the latter.
Move the translation code (and associated) to after clipping.

Fixes: https://gitlab.gnome.org/GNOME/mutter/issues/1097

https://gitlab.gnome.org/GNOME/mutter/merge_requests/1129
This commit is contained in:
Georges Basile Stavracas Neto 2020-03-16 19:55:16 -03:00
parent 82778f72a4
commit cdd27d0e53
1 changed files with 5 additions and 5 deletions
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10
src/compositor/meta-window-actor.c
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@ -1292,13 +1292,9 @@ meta_window_actor_blit_to_framebuffer (MetaScreenCastWindow *screen_cast_window,
clutter_actor_get_position (actor, &x, &y);
cogl_framebuffer_push_matrix (framebuffer);
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_scale (framebuffer, resource_scale, resource_scale, 1);
cogl_framebuffer_translate (framebuffer, -x, -y, 0);
meta_rectangle_scale_double (bounds, resource_scale,
META_ROUNDING_STRATEGY_GROW,
@ -1315,12 +1311,16 @@ meta_window_actor_blit_to_framebuffer (MetaScreenCastWindow *screen_cast_window,
scaled_clip.x + scaled_clip.width,
scaled_clip.y + scaled_clip.height);
cogl_framebuffer_push_matrix (framebuffer);
cogl_framebuffer_scale (framebuffer, resource_scale, resource_scale, 1);
cogl_framebuffer_translate (framebuffer, -x, -y, 0);
paint_context = clutter_paint_context_new_for_framebuffer (framebuffer);
clutter_actor_paint (actor, paint_context);
clutter_paint_context_destroy (paint_context);
cogl_framebuffer_pop_clip (framebuffer);
cogl_framebuffer_pop_matrix (framebuffer);
cogl_framebuffer_pop_clip (framebuffer);
return TRUE;
}