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wayland: Careful offloading with fractional scales

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Sadly, subsurface positioning is undefined in this case. We'll
trust the compositor to not mess up if the device coordinates
after applying the scale are integral, but otherwise, we'll
decline.
This commit is contained in:
Matthias Clasen 2023-11-21 11:02:11 -05:00
parent bda8f5393d
commit c99c06f0da
1 changed files with 26 additions and 0 deletions
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26
gdk/wayland/gdksubsurface-wayland.c
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@ -157,10 +157,14 @@ gdk_wayland_subsurface_attach (GdkSubsurface *sub,
GdkSubsurface *sibling)
{
GdkWaylandSubsurface *self = GDK_WAYLAND_SUBSURFACE (sub);
GdkWaylandSurface *parent = GDK_WAYLAND_SURFACE (sub->parent);
struct wl_buffer *buffer = NULL;
gboolean result = FALSE;
GdkWaylandSubsurface *sib = sibling ? GDK_WAYLAND_SUBSURFACE (sibling) : NULL;
gboolean will_be_above;
double scale;
graphene_rect_t device_rect;
cairo_rectangle_int_t device_dest;
if (sib)
will_be_above = sib->above_parent;
@ -178,6 +182,16 @@ gdk_wayland_subsurface_attach (GdkSubsurface *sub,
self->dest.width = rect->size.width;
self->dest.height = rect->size.height;
scale = gdk_fractional_scale_to_double (&parent->scale);
device_rect.origin.x = rect->origin.x * scale;
device_rect.origin.y = rect->origin.y * scale;
device_rect.size.width = rect->size.width * scale;
device_rect.size.height = rect->size.height * scale;
device_dest.x = device_rect.origin.x;
device_dest.y = device_rect.origin.y;
device_dest.width = device_rect.size.width;
device_dest.height = device_rect.size.height;
if (self->dest.x != rect->origin.x ||
self->dest.y != rect->origin.y ||
self->dest.width != rect->size.width ||
@ -191,6 +205,18 @@ gdk_wayland_subsurface_attach (GdkSubsurface *sub,
gdk_texture_get_height (texture),
self);
}
else if (device_dest.x != device_rect.origin.x ||
device_dest.y != device_rect.origin.y ||
device_dest.width != device_rect.size.width ||
device_dest.height != device_rect.size.height)
{
GDK_DISPLAY_DEBUG (gdk_surface_get_display (sub->parent), OFFLOAD,
"Non-integral device coordinates %g %g %g %g (fractional scale %.2f), hiding subsurface %p",
device_rect.origin.x, device_rect.origin.y,
device_rect.size.width, device_rect.size.width,
scale,
self);
}
else if (!GDK_IS_DMABUF_TEXTURE (texture))
{
GDK_DISPLAY_DEBUG (gdk_surface_get_display (sub->parent), OFFLOAD,