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wayland: scale down reported monitor geometry

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According to the documentation, gdk_monitor_get_geometry() reports the
monitor geometry in ”application pixels”, not in ”device pixels”,
meaning that the actual device resolution needs to be scaled down by the
scale factor of the output.

x11 backend does that downscaling, whereas Wayland backend did not,
causing a discrepancy depending on the backend used.

https://bugzilla.gnome.org/show_bug.cgi?id=783995
This commit is contained in:
Olivier Fourdan 2017-06-27 11:12:57 +02:00 committed by Matthias Clasen
parent bdd2ca9a60
commit 999848e0c6
1 changed files with 14 additions and 1 deletions
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15
gdk/wayland/gdkscreen-wayland.c
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@ -754,11 +754,22 @@ output_handle_scale (void *data,
int32_t scale)
{
GdkWaylandMonitor *monitor = (GdkWaylandMonitor *)data;
GdkRectangle previous_geometry;
int previous_scale;
int width;
int height;
GDK_NOTE (MISC,
g_message ("handle scale output %d, scale %d", monitor->id, scale));
gdk_monitor_get_geometry (GDK_MONITOR (monitor), &previous_geometry);
previous_scale = gdk_monitor_get_scale_factor (GDK_MONITOR (monitor));
width = previous_geometry.width * previous_scale;
height = previous_geometry.height * previous_scale;
gdk_monitor_set_scale_factor (GDK_MONITOR (monitor), scale);
gdk_monitor_set_size (GDK_MONITOR (monitor), width / scale, height / scale);
if (GDK_MONITOR (monitor)->geometry.width != 0 && monitor->version < OUTPUT_VERSION_WITH_DONE)
{
@ -776,6 +787,7 @@ output_handle_mode (void *data,
int refresh)
{
GdkWaylandMonitor *monitor = (GdkWaylandMonitor *)data;
int scale;
GDK_NOTE (MISC,
g_message ("handle mode output %d, size %d %d, rate %d",
@ -784,7 +796,8 @@ output_handle_mode (void *data,
if ((flags & WL_OUTPUT_MODE_CURRENT) == 0)
return;
gdk_monitor_set_size (GDK_MONITOR (monitor), width, height);
scale = gdk_monitor_get_scale_factor (GDK_MONITOR (monitor));
gdk_monitor_set_size (GDK_MONITOR (monitor), width / scale, height / scale);
gdk_monitor_set_refresh_rate (GDK_MONITOR (monitor), refresh);
if (width != 0 && monitor->version < OUTPUT_VERSION_WITH_DONE)