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x11: Set background as transparent as possible

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Instead of making the background black, make it transparent black for
RGBA visuals and set a None background otherwise.
This commit is contained in:
Benjamin Otte 2018-06-18 16:26:06 +02:00
parent 9a91d3739d
commit cbbb7604b6
1 changed files with 11 additions and 2 deletions
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13
gdk/x11/gdksurface-x11.c
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@ -885,10 +885,19 @@ _gdk_x11_display_create_surface_impl (GdkDisplay *display,
{
class = InputOutput;
xattributes.background_pixel = BlackPixel (xdisplay, x11_screen->screen_num);
if (gdk_display_is_rgba (display))
{
xattributes.background_pixel = 0;
xattributes_mask |= CWBackPixel;
}
else
{
xattributes.background_pixmap = None;
xattributes_mask |= CWBackPixmap;
}
xattributes.border_pixel = BlackPixel (xdisplay, x11_screen->screen_num);
xattributes_mask |= CWBorderPixel | CWBackPixel;
xattributes_mask |= CWBorderPixel;
xattributes.bit_gravity = NorthWestGravity;
xattributes_mask |= CWBitGravity;