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Add support for rudimentary fractional scaling

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When the logical layout mode is used, allow configuring the scaling to
be non-integer. Supported scales are so far hard coded to include at
most 1, 1.5 and 2, and scales that doesn't result in non-fractional
logical monitor sizes are discarded.

Wayland outputs are set to have scale ceil(actual_scale) meaning well
behaving Wayland clients will provide buffers with buffer scale 2, thus
being scaled down to the fractional scale.

https://bugzilla.gnome.org/show_bug.cgi?id=765011
This commit is contained in:
Jonas Ådahl
2017-05-25 17:20:59 +08:00
parent b64c69e4bc
commit 10b0351a59
12 changed files with 126 additions and 59 deletions
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13
src/wayland/meta-wayland-outputs.c
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@@ -111,6 +111,15 @@ calculate_suitable_subpixel_order (MetaLogicalMonitor *logical_monitor)
return cogl_subpixel_order_to_wl_output_subpixel (subpixel_order);
}
static int
calculate_wayland_output_scale (MetaLogicalMonitor *logical_monitor)
{
float scale;
scale = meta_logical_monitor_get_scale (logical_monitor);
return ceilf (scale);
}
static void
send_output_events (struct wl_resource *resource,
MetaWaylandOutput *wayland_output,
@@ -205,7 +214,7 @@ send_output_events (struct wl_resource *resource,
{
int scale;
scale = (int) meta_logical_monitor_get_scale (logical_monitor);
scale = calculate_wayland_output_scale (logical_monitor);
if (need_all_events ||
old_scale != scale)
{
@@ -273,7 +282,7 @@ meta_wayland_output_set_logical_monitor (MetaWaylandOutput *wayland_output,
if (current_mode == preferred_mode)
wayland_output->mode_flags |= WL_OUTPUT_MODE_PREFERRED;
wayland_output->scale = (int) meta_logical_monitor_get_scale (logical_monitor);
wayland_output->scale = calculate_wayland_output_scale (logical_monitor);
wayland_output->refresh_rate = meta_monitor_mode_get_refresh_rate (current_mode);
}