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xwayland: Multi DPI support via global factor rescaling 

To benefit from Wayland's multi DPI capabilities in XWayland a global scaling
factor is introduced, which is applied to all outputs.

The RandR size of an output is calculated by the (integer-)multiplication of
this global scaling factor with its logical size received via the xdg-output
protocol.

In other words the size of any RandR screen corresponds to the mode size of
its wl_output multiplied with the quotient of global scaling factor divided by
the compositor's internal output-dependent scaling factor.

HiDPI aware X clients can then provide Pixmaps enlarged by the global scaling
factor and the Wayland compositor is supposed to downscale these buffers on
outputs scaled by less than the global scaling factor.

A Wayland compositor needs to scale all X communication in its XWM part by the
global scaling factor, such that X windows have the correct geometry.

In summary:
* All positions in Wayland internal communication must be carried out by the
compositor in logical coordinates, i.e. in its compositor space.
* All positions in X internal communication are based on RandR sizes.
* All positions in Wayland to X communication must be multiplied by the global
scaling factor.
* All positions in X to Wayland communication must be divided by the global
scaling factor.

In order to not break compositors that do not support these transformations,
the global scaling factor is set to 1 by default, which behaves the same as
before.

[dirbaio@dirbaio.net: fix incorrect scaling in a few places]
[rymg19@gmail.com: minor style fixes]
Signed-off-by: Roman Gilg <subdiff@gmail.com>
Signed-off-by: Dario Nieuwenhuis <dirbaio@dirbaio.net>
This commit is contained in:
Dario Nieuwenhuis 2020-05-02 03:52:55 +02:00 committed by Ryan Gonzalez
parent 18d3131f9a
commit fbc7cefc43
7 changed files with 76 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
hw/xwayland/xwayland-cursor.c
View File

@ -190,6 +190,7 @@ xwl_cursor_attach_pixmap(struct xwl_seat *xwl_seat,
void
xwl_seat_set_cursor(struct xwl_seat *xwl_seat)
{
struct xwl_screen *xwl_screen = xwl_seat->xwl_screen;
struct xwl_cursor *xwl_cursor = &xwl_seat->cursor;
PixmapPtr pixmap;
CursorPtr cursor;
@ -220,8 +221,8 @@ xwl_seat_set_cursor(struct xwl_seat *xwl_seat)
wl_pointer_set_cursor(xwl_seat->wl_pointer,
xwl_seat->pointer_enter_serial,
xwl_cursor->surface,
xwl_seat->x_cursor->bits->xhot,
xwl_seat->x_cursor->bits->yhot);
xwl_scale_to(xwl_screen, xwl_seat->x_cursor->bits->xhot),
xwl_scale_to(xwl_screen, xwl_seat->x_cursor->bits->yhot));
xwl_cursor_attach_pixmap(xwl_seat, xwl_cursor, pixmap);
}
@ -230,6 +231,7 @@ void
xwl_tablet_tool_set_cursor(struct xwl_tablet_tool *xwl_tablet_tool)
{
struct xwl_seat *xwl_seat = xwl_tablet_tool->seat;
struct xwl_screen *xwl_screen = xwl_seat->xwl_screen;
struct xwl_cursor *xwl_cursor = &xwl_tablet_tool->cursor;
PixmapPtr pixmap;
CursorPtr cursor;
@ -258,8 +260,8 @@ xwl_tablet_tool_set_cursor(struct xwl_tablet_tool *xwl_tablet_tool)
zwp_tablet_tool_v2_set_cursor(xwl_tablet_tool->tool,
xwl_tablet_tool->proximity_in_serial,
xwl_cursor->surface,
xwl_seat->x_cursor->bits->xhot,
xwl_seat->x_cursor->bits->yhot);
xwl_scale_to(xwl_screen, xwl_seat->x_cursor->bits->xhot),
xwl_scale_to(xwl_screen, xwl_seat->x_cursor->bits->yhot));
xwl_cursor_attach_pixmap(xwl_seat, xwl_cursor, pixmap);
}

39
hw/xwayland/xwayland-input.c
View File

@ -412,8 +412,8 @@ pointer_handle_enter(void *data, struct wl_pointer *pointer,
DeviceIntPtr dev = get_pointer_device(xwl_seat);
DeviceIntPtr master;
int i;
int sx = wl_fixed_to_int(sx_w);
int sy = wl_fixed_to_int(sy_w);
int sx = wl_fixed_to_int(sx_w) * xwl_seat->xwl_screen->global_output_scale;
int sy = wl_fixed_to_int(sy_w) * xwl_seat->xwl_screen->global_output_scale;
int dx, dy;
ScreenPtr pScreen = xwl_seat->xwl_screen->screen;
ValuatorMask mask;
@ -592,13 +592,14 @@ pointer_handle_motion(void *data, struct wl_pointer *pointer,
uint32_t time, wl_fixed_t sx_w, wl_fixed_t sy_w)
{
struct xwl_seat *xwl_seat = data;
int32_t scale = xwl_seat->xwl_screen->global_output_scale;
if (!xwl_seat->focus_window)
return;
xwl_seat->pending_pointer_event.has_absolute = TRUE;
xwl_seat->pending_pointer_event.x = sx_w;
xwl_seat->pending_pointer_event.y = sy_w;
xwl_seat->pending_pointer_event.x = sx_w * scale;
xwl_seat->pending_pointer_event.y = sy_w * scale;
if (wl_proxy_get_version((struct wl_proxy *) xwl_seat->wl_pointer) < 5)
dispatch_pointer_motion_event(xwl_seat);
@ -672,7 +673,8 @@ pointer_handle_axis(void *data, struct wl_pointer *pointer,
xorg_list_del(&pending->l);
free(pending);
} else {
valuator_mask_set_double(&mask, index, wl_fixed_to_double(value) / divisor);
double scaled_value = wl_fixed_to_double(value);
valuator_mask_set_double(&mask, index, scaled_value / divisor);
}
QueuePointerEvents(get_pointer_device(xwl_seat),
@ -740,12 +742,13 @@ relative_pointer_handle_relative_motion(void *data,
wl_fixed_t dy_unaccelf)
{
struct xwl_seat *xwl_seat = data;
int32_t scale = xwl_seat->xwl_screen->global_output_scale;
xwl_seat->pending_pointer_event.has_relative = TRUE;
xwl_seat->pending_pointer_event.dx = wl_fixed_to_double(dxf);
xwl_seat->pending_pointer_event.dy = wl_fixed_to_double(dyf);
xwl_seat->pending_pointer_event.dx_unaccel = wl_fixed_to_double(dx_unaccelf);
xwl_seat->pending_pointer_event.dy_unaccel = wl_fixed_to_double(dy_unaccelf);
xwl_seat->pending_pointer_event.dx = wl_fixed_to_double(dxf) * scale;
xwl_seat->pending_pointer_event.dy = wl_fixed_to_double(dyf) * scale;
xwl_seat->pending_pointer_event.dx_unaccel = wl_fixed_to_double(dx_unaccelf) * scale;
xwl_seat->pending_pointer_event.dy_unaccel = wl_fixed_to_double(dy_unaccelf) * scale;
if (!xwl_seat->focus_window)
return;
@ -1057,8 +1060,8 @@ touch_handle_down(void *data, struct wl_touch *wl_touch,
xwl_touch->window = wl_surface_get_user_data(surface);
xwl_touch->id = id;
xwl_touch->x = wl_fixed_to_int(sx_w);
xwl_touch->y = wl_fixed_to_int(sy_w);
xwl_touch->x = wl_fixed_to_int(sx_w) * xwl_seat->xwl_screen->global_output_scale;
xwl_touch->y = wl_fixed_to_int(sy_w) * xwl_seat->xwl_screen->global_output_scale;
xorg_list_add(&xwl_touch->link_touch, &xwl_seat->touches);
xwl_touch_send_event(xwl_touch, xwl_seat, XI_TouchBegin);
@ -1094,8 +1097,8 @@ touch_handle_motion(void *data, struct wl_touch *wl_touch,
if (!xwl_touch)
return;
xwl_touch->x = wl_fixed_to_int(sx_w);
xwl_touch->y = wl_fixed_to_int(sy_w);
xwl_touch->x = wl_fixed_to_int(sx_w) * xwl_seat->xwl_screen->global_output_scale;;
xwl_touch->y = wl_fixed_to_int(sy_w) * xwl_seat->xwl_screen->global_output_scale;;
xwl_touch_send_event(xwl_touch, xwl_seat, XI_TouchUpdate);
}
@ -1726,8 +1729,8 @@ tablet_tool_motion(void *data, struct zwp_tablet_tool_v2 *tool,
struct xwl_tablet_tool *xwl_tablet_tool = data;
struct xwl_seat *xwl_seat = xwl_tablet_tool->seat;
int32_t dx, dy;
double sx = wl_fixed_to_double(x);
double sy = wl_fixed_to_double(y);
double sx = wl_fixed_to_double(x) * xwl_seat->xwl_screen->global_output_scale;
double sy = wl_fixed_to_double(y) * xwl_seat->xwl_screen->global_output_scale;
if (!xwl_seat->tablet_focus_window)
return;
@ -2714,6 +2717,7 @@ xwl_pointer_warp_emulator_set_fake_pos(struct xwl_pointer_warp_emulator *warp_em
int x,
int y)
{
struct xwl_screen *xwl_screen;
struct zwp_locked_pointer_v1 *locked_pointer =
warp_emulator->locked_pointer;
WindowPtr window;
@ -2725,6 +2729,7 @@ xwl_pointer_warp_emulator_set_fake_pos(struct xwl_pointer_warp_emulator *warp_em
if (!warp_emulator->xwl_seat->focus_window)
return;
xwl_screen = warp_emulator->xwl_seat->xwl_screen;
window = warp_emulator->xwl_seat->focus_window->window;
if (x >= window->drawable.x ||
y >= window->drawable.y ||
@ -2733,8 +2738,8 @@ xwl_pointer_warp_emulator_set_fake_pos(struct xwl_pointer_warp_emulator *warp_em
sx = x - window->drawable.x;
sy = y - window->drawable.y;
zwp_locked_pointer_v1_set_cursor_position_hint(locked_pointer,
wl_fixed_from_int(sx),
wl_fixed_from_int(sy));
wl_fixed_from_int(xwl_scale_to(xwl_screen, sx)),
wl_fixed_from_int(xwl_scale_to(xwl_screen, sy)));
wl_surface_commit(warp_emulator->xwl_seat->focus_window->surface);
}
}

18
hw/xwayland/xwayland-output.c
View File

@ -191,6 +191,9 @@ update_screen_size(struct xwl_output *xwl_output, int width, int height)
{
struct xwl_screen *xwl_screen = xwl_output->xwl_screen;
width *= xwl_screen->global_output_scale;
height *= xwl_screen->global_output_scale;
if (xwl_screen->root_clip_mode == ROOT_CLIP_FULL)
SetRootClip(xwl_screen->screen, ROOT_CLIP_NONE);
@ -497,14 +500,15 @@ xwl_output_set_emulated_mode(struct xwl_output *xwl_output, ClientPtr client,
xwl_output_set_randr_emu_props(xwl_output->xwl_screen, client);
}
static void
apply_output_change(struct xwl_output *xwl_output)
void
xwl_output_apply_changes(struct xwl_output *xwl_output)
{
struct xwl_screen *xwl_screen = xwl_output->xwl_screen;
struct xwl_output *it;
int mode_width, mode_height, count;
int width = 0, height = 0, has_this_output = 0;
RRModePtr *randr_modes;
int32_t scale = xwl_screen->global_output_scale;
/* Clear out the "done" received flags */
xwl_output->wl_output_done = FALSE;
@ -523,10 +527,10 @@ apply_output_change(struct xwl_output *xwl_output)
}
/* Build a fresh modes array using the current refresh rate */
randr_modes = output_get_rr_modes(xwl_output, mode_width, mode_height, &count);
randr_modes = output_get_rr_modes(xwl_output, mode_width * scale, mode_height * scale, &count);
RROutputSetModes(xwl_output->randr_output, randr_modes, count, 1);
RRCrtcNotify(xwl_output->randr_crtc, randr_modes[0],
xwl_output->x, xwl_output->y,
xwl_output->x * scale, xwl_output->y * scale,
xwl_output->rotation, NULL, 1, &xwl_output->randr_output);
/* RROutputSetModes takes ownership of the passed in modes, so we only
* have to free the pointer array.
@ -567,7 +571,7 @@ output_handle_done(void *data, struct wl_output *wl_output)
*/
if (xwl_output->xdg_output_done || !xwl_output->xdg_output ||
zxdg_output_v1_get_version(xwl_output->xdg_output) >= 3)
apply_output_change(xwl_output);
xwl_output_apply_changes(xwl_output);
}
static void
@ -610,7 +614,7 @@ xdg_output_handle_done(void *data, struct zxdg_output_v1 *xdg_output)
xwl_output->xdg_output_done = TRUE;
if (xwl_output->wl_output_done &&
zxdg_output_v1_get_version(xdg_output) < 3)
apply_output_change(xwl_output);
xwl_output_apply_changes(xwl_output);
}
static void
@ -678,6 +682,8 @@ xwl_output_create(struct xwl_screen *xwl_screen, uint32_t id)
RROutputSetConnection(xwl_output->randr_output, RR_Connected);
RRTellChanged(xwl_screen->screen);
xwl_output->scale = 1;
/* We want the output to be in the list as soon as created so we can
* use it when binding to the xdg-output protocol...
*/

4
hw/xwayland/xwayland-output.h
View File

@ -43,7 +43,7 @@ struct xwl_output {
struct xwl_screen *xwl_screen;
RROutputPtr randr_output;
RRCrtcPtr randr_crtc;
int32_t x, y, width, height, refresh;
int32_t x, y, width, height, scale, refresh;
Rotation rotation;
Bool wl_output_done;
Bool xdg_output_done;
@ -77,6 +77,8 @@ void xwl_output_set_emulated_mode(struct xwl_output *xwl_output,
void xwl_output_set_window_randr_emu_props(struct xwl_screen *xwl_screen,
WindowPtr window);
void xwl_output_apply_changes(struct xwl_output *xwl_output);
void xwl_screen_init_xdg_output(struct xwl_screen *xwl_screen);
#endif /* XWAYLAND_OUTPUT_H */

27
hw/xwayland/xwayland-screen.c
View File

@ -110,6 +110,12 @@ xwl_screen_has_resolution_change_emulation(struct xwl_screen *xwl_screen)
return xwl_screen->rootless && xwl_screen_has_viewport_support(xwl_screen);
}
int
xwl_scale_to(struct xwl_screen *xwl_screen, int value)
{
return value / (double)xwl_screen->global_output_scale + 0.5;
}
/* Return the output @ 0x0, falling back to the first output in the list */
struct xwl_output *
xwl_screen_get_first_output(struct xwl_screen *xwl_screen)
@ -521,8 +527,14 @@ void xwl_surface_damage(struct xwl_screen *xwl_screen,
{
if (wl_surface_get_version(surface) >= WL_SURFACE_DAMAGE_BUFFER_SINCE_VERSION)
wl_surface_damage_buffer(surface, x, y, width, height);
else
else {
x = xwl_scale_to(xwl_screen, x);
y = xwl_scale_to(xwl_screen, y);
width = xwl_scale_to(xwl_screen, width);
height = xwl_scale_to(xwl_screen, height);
wl_surface_damage(surface, x, y, width, height);
}
}
void
@ -538,6 +550,18 @@ xwl_screen_roundtrip(struct xwl_screen *xwl_screen)
xwl_give_up("could not connect to wayland server\n");
}
void
xwl_screen_set_global_scale(struct xwl_screen *xwl_screen, int32_t scale)
{
struct xwl_output *it;
xwl_screen->global_output_scale = scale;
/* change randr resolutions and positions */
xorg_list_for_each_entry(it, &xwl_screen->output_list, link) {
xwl_output_apply_changes(it);
}
}
Bool
xwl_screen_init(ScreenPtr pScreen, int argc, char **argv)
{
@ -573,6 +597,7 @@ xwl_screen_init(ScreenPtr pScreen, int argc, char **argv)
#ifdef XWL_HAS_GLAMOR
xwl_screen->glamor = 1;
#endif
xwl_screen->global_output_scale = 1;
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-rootless") == 0) {

4
hw/xwayland/xwayland-screen.h
View File

@ -72,6 +72,8 @@ struct xwl_screen {
struct xorg_list damage_window_list;
struct xorg_list window_list;
int32_t global_output_scale;
int wayland_fd;
struct wl_display *display;
struct wl_registry *registry;
@ -134,5 +136,7 @@ void xwl_screen_roundtrip (struct xwl_screen *xwl_screen);
void xwl_surface_damage(struct xwl_screen *xwl_screen,
struct wl_surface *surface,
int32_t x, int32_t y, int32_t width, int32_t height);
int xwl_scale_to(struct xwl_screen *xwl_screen, int value);
void xwl_screen_set_global_scale(struct xwl_screen *xwl_screen, int32_t scale);
#endif /* XWAYLAND_SCREEN_H */

4
hw/xwayland/xwayland-window.c
View File

@ -470,7 +470,8 @@ ensure_surface_for_window(WindowPtr window)
}
wl_region_add(region, 0, 0,
window->drawable.width, window->drawable.height);
xwl_scale_to(xwl_screen, window->drawable.width),
xwl_scale_to(xwl_screen, window->drawable.height));
wl_surface_set_opaque_region(xwl_window->surface, region);
wl_region_destroy(region);
}
@ -819,6 +820,7 @@ xwl_window_post_damage(struct xwl_window *xwl_window)
}
#endif
wl_surface_set_buffer_scale(xwl_window->surface, xwl_screen->global_output_scale);
wl_surface_attach(xwl_window->surface, buffer, 0, 0);
/* Arbitrary limit to try to avoid flooding the Wayland