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wayland: Implement SetWindowOpacity via the alpha modifier protocol

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The wp_alpha_modifier_v1 protocol allows for a global blending factor to be specified for an entire surface. Use this to add support for SDL_SetWindowOpacity().
This commit is contained in:
Frank Praznik 2024-05-14 13:10:09 -04:00
parent 606903c02f
commit 716dc0e1bf
No known key found for this signature in database
5 changed files with 155 additions and 10 deletions
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9
src/video/wayland/SDL_waylandvideo.c
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@ -43,6 +43,7 @@
#include <wayland-util.h>
#include "alpha-modifier-v1-client-protocol.h"
#include "cursor-shape-v1-client-protocol.h"
#include "fractional-scale-v1-client-protocol.h"
#include "idle-inhibit-unstable-v1-client-protocol.h"
@ -487,6 +488,7 @@ static SDL_VideoDevice *Wayland_CreateDevice(void)
device->SetWindowMinimumSize = Wayland_SetWindowMinimumSize;
device->SetWindowMaximumSize = Wayland_SetWindowMaximumSize;
device->SetWindowModalFor = Wayland_SetWindowModalFor;
device->SetWindowOpacity = Wayland_SetWindowOpacity;
device->SetWindowTitle = Wayland_SetWindowTitle;
device->GetWindowSizeInPixels = Wayland_GetWindowSizeInPixels;
device->GetDisplayForWindow = Wayland_GetDisplayForWindow;
@ -1107,6 +1109,8 @@ static void display_handle_global(void *data, struct wl_registry *registry, uint
d->zxdg_exporter_v2 = wl_registry_bind(d->registry, id, &zxdg_exporter_v2_interface, 1);
} else if (SDL_strcmp(interface, "xdg_wm_dialog_v1") == 0) {
d->xdg_wm_dialog_v1 = wl_registry_bind(d->registry, id, &xdg_wm_dialog_v1_interface, 1);
} else if (SDL_strcmp(interface, "wp_alpha_modifier_v1") == 0) {
d->wp_alpha_modifier_v1 = wl_registry_bind(d->registry, id, &wp_alpha_modifier_v1_interface, 1);
} else if (SDL_strcmp(interface, "kde_output_order_v1") == 0) {
d->kde_output_order = wl_registry_bind(d->registry, id, &kde_output_order_v1_interface, 1);
kde_output_order_v1_add_listener(d->kde_output_order, &kde_output_order_listener, d);
@ -1369,6 +1373,11 @@ static void Wayland_VideoCleanup(SDL_VideoDevice *_this)
data->xdg_wm_dialog_v1 = NULL;
}
if (data->wp_alpha_modifier_v1) {
wp_alpha_modifier_v1_destroy(data->wp_alpha_modifier_v1);
data->wp_alpha_modifier_v1 = NULL;
}
if (data->kde_output_order) {
Wayland_FlushOutputOrder(data);
kde_output_order_v1_destroy(data->kde_output_order);

1
src/video/wayland/SDL_waylandvideo.h
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@ -81,6 +81,7 @@ struct SDL_VideoData
struct zwp_input_timestamps_manager_v1 *input_timestamps_manager;
struct zxdg_exporter_v2 *zxdg_exporter_v2;
struct xdg_wm_dialog_v1 *xdg_wm_dialog_v1;
struct wp_alpha_modifier_v1 *wp_alpha_modifier_v1;
struct kde_output_order_v1 *kde_output_order;
struct xkb_context *xkb_context;

50
src/video/wayland/SDL_waylandwindow.c
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@ -32,6 +32,7 @@
#include "SDL_waylandvideo.h"
#include "../../SDL_hints_c.h"
#include "alpha-modifier-v1-client-protocol.h"
#include "xdg-shell-client-protocol.h"
#include "xdg-decoration-unstable-v1-client-protocol.h"
#include "idle-inhibit-unstable-v1-client-protocol.h"
@ -279,10 +280,24 @@ static void RepositionPopup(SDL_Window *window, SDL_bool use_current_position)
}
}
static void SetSurfaceOpaqueRegion(SDL_WindowData *wind, SDL_bool is_opaque)
{
SDL_VideoData *viddata = wind->waylandData;
if (is_opaque) {
struct wl_region *region = wl_compositor_create_region(viddata->compositor);
wl_region_add(region, 0, 0,
wind->current.logical_width, wind->current.logical_height);
wl_surface_set_opaque_region(wind->surface, region);
wl_region_destroy(region);
} else {
wl_surface_set_opaque_region(wind->surface, NULL);
}
}
static void ConfigureWindowGeometry(SDL_Window *window)
{
SDL_WindowData *data = window->driverdata;
SDL_VideoData *viddata = data->waylandData;
const int old_pixel_width = data->current.pixel_width;
const int old_pixel_height = data->current.pixel_height;
int window_width, window_height;
@ -391,20 +406,12 @@ static void ConfigureWindowGeometry(SDL_Window *window)
* need to be recalculated if the output size has changed.
*/
if (window_size_changed) {
struct wl_region *region;
/* libdecor does this internally on frame commits, so it's only needed for xdg surfaces. */
if (data->shell_surface_type != WAYLAND_SURFACE_LIBDECOR && data->shell_surface.xdg.surface) {
xdg_surface_set_window_geometry(data->shell_surface.xdg.surface, 0, 0, data->current.logical_width, data->current.logical_height);
}
if (!(window->flags & SDL_WINDOW_TRANSPARENT)) {
region = wl_compositor_create_region(viddata->compositor);
wl_region_add(region, 0, 0,
data->current.logical_width, data->current.logical_height);
wl_surface_set_opaque_region(data->surface, region);
wl_region_destroy(region);
}
SetSurfaceOpaqueRegion(data, !(window->flags & SDL_WINDOW_TRANSPARENT) && window->opacity == 1.0f);
/* Ensure that child popup windows are still in bounds. */
for (SDL_Window *child = window->first_child; child; child = child->next_sibling) {
@ -2302,6 +2309,11 @@ int Wayland_CreateWindow(SDL_VideoDevice *_this, SDL_Window *window, SDL_Propert
}
}
if (!custom_surface_role && c->wp_alpha_modifier_v1) {
data->wp_alpha_modifier_surface_v1 = wp_alpha_modifier_v1_get_surface(c->wp_alpha_modifier_v1, data->surface);
wp_alpha_modifier_surface_v1_set_multiplier(data->wp_alpha_modifier_surface_v1, SDL_MAX_UINT32);
}
/* Must be called before EGL configuration to set the drawable backbuffer size. */
ConfigureWindowGeometry(window);
@ -2494,6 +2506,20 @@ SDL_DisplayID Wayland_GetDisplayForWindow(SDL_VideoDevice *_this, SDL_Window *wi
return 0;
}
int Wayland_SetWindowOpacity(SDL_VideoDevice *_this, SDL_Window *window, float opacity)
{
SDL_WindowData *wind = window->driverdata;
if (wind->wp_alpha_modifier_surface_v1) {
SetSurfaceOpaqueRegion(wind, !(window->flags & SDL_WINDOW_TRANSPARENT) && opacity == 1.0f);
wp_alpha_modifier_surface_v1_set_multiplier(wind->wp_alpha_modifier_surface_v1, (Uint32)((double)SDL_MAX_UINT32 * (double)opacity));
return 0;
}
return SDL_SetError("wayland: set window opacity failed; compositor lacks support for the required wp_alpha_modifier_v1 protocol");
}
void Wayland_SetWindowTitle(SDL_VideoDevice *_this, SDL_Window *window)
{
SDL_WindowData *wind = window->driverdata;
@ -2614,6 +2640,10 @@ void Wayland_DestroyWindow(SDL_VideoDevice *_this, SDL_Window *window)
wp_fractional_scale_v1_destroy(wind->fractional_scale);
}
if (wind->wp_alpha_modifier_surface_v1) {
wp_alpha_modifier_surface_v1_destroy(wind->wp_alpha_modifier_surface_v1);
}
SDL_free(wind->outputs);
SDL_free(wind->app_id);

2
src/video/wayland/SDL_waylandwindow.h
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@ -97,6 +97,7 @@ struct SDL_WindowData
struct wp_fractional_scale_v1 *fractional_scale;
struct zxdg_exported_v2 *exported;
struct xdg_dialog_v1 *xdg_dialog_v1;
struct wp_alpha_modifier_surface_v1 *wp_alpha_modifier_surface_v1;
SDL_AtomicInt swap_interval_ready;
@ -193,6 +194,7 @@ extern void Wayland_SetWindowMaximumSize(SDL_VideoDevice *_this, SDL_Window *win
extern void Wayland_GetWindowSizeInPixels(SDL_VideoDevice *_this, SDL_Window *window, int *w, int *h);
extern SDL_DisplayID Wayland_GetDisplayForWindow(SDL_VideoDevice *_this, SDL_Window *window);
extern int Wayland_SetWindowModalFor(SDL_VideoDevice *_this, SDL_Window *modal_window, SDL_Window *parent_window);
extern int Wayland_SetWindowOpacity(SDL_VideoDevice *_this, SDL_Window *window, float opacity);
extern void Wayland_SetWindowTitle(SDL_VideoDevice *_this, SDL_Window *window);
extern void Wayland_ShowWindowSystemMenu(SDL_Window *window, int x, int y);
extern void Wayland_DestroyWindow(SDL_VideoDevice *_this, SDL_Window *window);

103
wayland-protocols/alpha-modifier-v1.xml Normal file
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@ -0,0 +1,103 @@
<?xml version="1.0" encoding="UTF-8"?>
<protocol name="alpha_modifier_v1">
<copyright>
Copyright © 2024 Xaver Hugl
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice (including the next
paragraph) shall be included in all copies or substantial portions of the
Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
</copyright>
<interface name="wp_alpha_modifier_v1" version="1">
<description summary="surface alpha modifier manager">
This interface allows a client to set a factor for the alpha values on a
surface, which can be used to offload such operations to the compositor,
which can in turn for example offload them to KMS.
Warning! The protocol described in this file is currently in the testing
phase. Backward compatible changes may be added together with the
corresponding interface version bump. Backward incompatible changes can
only be done by creating a new major version of the extension.
</description>
<request name="destroy" type="destructor">
<description summary="destroy the alpha modifier manager object">
Destroy the alpha modifier manager. This doesn't destroy objects
created with the manager.
</description>
</request>
<enum name="error">
<entry name="already_constructed" value="0"
summary="wl_surface already has a alpha modifier object"/>
</enum>
<request name="get_surface">
<description summary="create a new toplevel decoration object">
Create a new alpha modifier surface object associated with the
given wl_surface. If there is already such an object associated with
the wl_surface, the already_constructed error will be raised.
</description>
<arg name="id" type="new_id" interface="wp_alpha_modifier_surface_v1"/>
<arg name="surface" type="object" interface="wl_surface"/>
</request>
</interface>
<interface name="wp_alpha_modifier_surface_v1" version="1">
<description summary="alpha modifier object for a surface">
This interface allows the client to set a factor for the alpha values on
a surface, which can be used to offload such operations to the compositor.
The default factor is UINT32_MAX.
This object has to be destroyed before the associated wl_surface. Once the
wl_surface is destroyed, all request on this object will raise the
no_surface error.
</description>
<enum name="error">
<entry name="no_surface" value="0" summary="wl_surface was destroyed"/>
</enum>
<request name="destroy" type="destructor">
<description summary="destroy the alpha modifier object">
This destroys the object, and is equivalent to set_multiplier with
a value of UINT32_MAX, with the same double-buffered semantics as
set_multiplier.
</description>
</request>
<request name="set_multiplier">
<description summary="specify the alpha multiplier">
Sets the alpha multiplier for the surface. The alpha multiplier is
double-buffered state, see wl_surface.commit for details.
This factor is applied in the compositor's blending space, as an
additional step after the processing of per-pixel alpha values for the
wl_surface. The exact meaning of the factor is thus undefined, unless
the blending space is specified in a different extension.
This multiplier is applied even if the buffer attached to the
wl_surface doesn't have an alpha channel; in that case an alpha value
of one is used instead.
Zero means completely transparent, UINT32_MAX means completely opaque.
</description>
<arg name="factor" type="uint"/>
</request>
</interface>
</protocol>