mutter/src/wayland/meta-wayland-viewporter.c
Robert Mader ba7af4f7d3 wayland/surface: Add support for wp_viewporter
This adds the required bits to wayland surfaces and ties them up
to the compositor parts.

It is based on and very similar in nature to buffer transforms.

From the specification:
> The global interface exposing surface cropping and scaling
> capabilities is used to instantiate an interface extension for a
> wl_surface object. This extended interface will then allow cropping
> and scaling the surface contents, effectively disconnecting the
> direct relationship between the buffer and the surface size.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/323
2019-02-06 12:24:03 +00:00

231 lines
7.3 KiB
C

/*
* Wayland Support
*
* Copyright (C) 2018-2019 Robert Mader <robert.mader@posteo.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
*/
#include "config.h"
#include "meta-wayland-viewporter.h"
#include <glib.h>
#include "wayland/meta-wayland-private.h"
#include "wayland/meta-wayland-subsurface.h"
#include "wayland/meta-wayland-surface.h"
#include "wayland/meta-wayland-versions.h"
#include "viewporter-server-protocol.h"
static void
wp_viewport_destructor (struct wl_resource *resource)
{
MetaWaylandSurface *surface;
surface = wl_resource_get_user_data (resource);
if (!surface)
return;
g_signal_handler_disconnect (surface, surface->viewport.destroy_handler_id);
surface->viewport.destroy_handler_id = 0;
surface->pending->viewport_src_rect.size.width = -1;
surface->pending->viewport_dst_width = -1;
surface->pending->has_new_viewport_src_rect = TRUE;
surface->pending->has_new_viewport_dst_size = TRUE;
surface->viewport.resource = NULL;
}
static void
on_surface_destroyed (MetaWaylandSurface *surface)
{
wl_resource_set_user_data (surface->viewport.resource, NULL);
}
static void
wp_viewport_destroy (struct wl_client *client,
struct wl_resource *resource)
{
wl_resource_destroy (resource);
}
static void
wp_viewport_set_source (struct wl_client *client,
struct wl_resource *resource,
wl_fixed_t src_x,
wl_fixed_t src_y,
wl_fixed_t src_width,
wl_fixed_t src_height)
{
MetaWaylandSurface *surface;
float new_x;
float new_y;
float new_width;
float new_height;
surface = wl_resource_get_user_data (resource);
if (!surface)
{
wl_resource_post_error (resource,
WP_VIEWPORT_ERROR_NO_SURFACE,
"wl_surface for this viewport no longer exists");
return;
}
new_x = wl_fixed_to_double (src_x);
new_y = wl_fixed_to_double (src_y);
new_width = wl_fixed_to_double (src_width);
new_height = wl_fixed_to_double (src_height);
if ((new_x >= 0 && new_y >= 0 &&
new_width > 0 && new_height > 0) ||
(new_x == -1 && new_y == -1 &&
new_width == -1 && new_height == -1))
{
surface->pending->viewport_src_rect.origin.x = new_x;
surface->pending->viewport_src_rect.origin.y = new_y;
surface->pending->viewport_src_rect.size.width = new_width;
surface->pending->viewport_src_rect.size.height = new_height;
surface->pending->has_new_viewport_src_rect = TRUE;
}
else
{
wl_resource_post_error (resource,
WP_VIEWPORT_ERROR_BAD_VALUE,
"x and y values must be zero or positive and "
"width and height valuest must be positive or "
"all values must be -1 to unset the viewport");
}
}
static void
wp_viewport_set_destination (struct wl_client *client,
struct wl_resource *resource,
int dst_width,
int dst_height)
{
MetaWaylandSurface *surface;
surface = wl_resource_get_user_data (resource);
if (!surface)
{
wl_resource_post_error (resource,
WP_VIEWPORT_ERROR_NO_SURFACE,
"wl_surface for this viewport no longer exists");
return;
}
if ((dst_width > 0 && dst_height > 0) ||
(dst_width == -1 && dst_height == -1))
{
surface->pending->viewport_dst_width = dst_width;
surface->pending->viewport_dst_height = dst_height;
surface->pending->has_new_viewport_dst_size = TRUE;
}
else
{
wl_resource_post_error (resource,
WP_VIEWPORT_ERROR_BAD_VALUE,
"all values must be either positive or -1");
}
}
static const struct wp_viewport_interface meta_wayland_viewport_interface = {
wp_viewport_destroy,
wp_viewport_set_source,
wp_viewport_set_destination,
};
static void
wp_viewporter_destroy (struct wl_client *client,
struct wl_resource *resource)
{
wl_resource_destroy (resource);
}
static void
wp_viewporter_get_viewport (struct wl_client *client,
struct wl_resource *resource,
uint32_t viewport_id,
struct wl_resource *surface_resource)
{
MetaWaylandSurface *surface;
struct wl_resource *viewport_resource;
surface = wl_resource_get_user_data (surface_resource);
if (surface->viewport.resource)
{
wl_resource_post_error (resource,
WP_VIEWPORTER_ERROR_VIEWPORT_EXISTS,
"viewport already exists on surface");
return;
}
viewport_resource = wl_resource_create (client,
&wp_viewport_interface,
wl_resource_get_version (resource),
viewport_id);
wl_resource_set_implementation (viewport_resource,
&meta_wayland_viewport_interface,
surface,
wp_viewport_destructor);
surface->viewport.resource = viewport_resource;
surface->viewport.destroy_handler_id =
g_signal_connect (surface,
"destroy",
G_CALLBACK (on_surface_destroyed),
NULL);
}
static const struct wp_viewporter_interface meta_wayland_viewporter_interface = {
wp_viewporter_destroy,
wp_viewporter_get_viewport,
};
static void
wp_viewporter_bind (struct wl_client *client,
void *data,
uint32_t version,
uint32_t id)
{
struct wl_resource *resource;
resource = wl_resource_create (client,
&wp_viewporter_interface,
version,
id);
wl_resource_set_implementation (resource,
&meta_wayland_viewporter_interface,
data,
NULL);
}
void
meta_wayland_init_viewporter (MetaWaylandCompositor *compositor)
{
if (wl_global_create (compositor->wayland_display,
&wp_viewporter_interface,
META_WP_VIEWPORTER_VERSION,
compositor,
wp_viewporter_bind) == NULL)
g_error ("Failed to register a global wl-viewporter object");
}