single-pixel-buffer-v1: new protocol implementation

This implements the single-pixel-buffer-v1 protocol [1], to allow clients
to create 1x1 buffers with a single color.

[1]: https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/104
This commit is contained in:
Simon Ser 2022-01-18 19:48:40 +01:00
parent f1e05a6493
commit b24b50ec0c
4 changed files with 193 additions and 0 deletions

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@ -0,0 +1,19 @@
/*
* This an unstable interface of wlroots. No guarantees are made regarding the
* future consistency of this API.
*/
#ifndef WLR_USE_UNSTABLE
#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
#endif
#ifndef WLR_TYPES_WLR_SINGLE_PIXEL_BUFFER_V1
#define WLR_TYPES_WLR_SINGLE_PIXEL_BUFFER_V1
#include <wayland-server-core.h>
struct wlr_single_pixel_buffer_manager_v1;
struct wlr_single_pixel_buffer_manager_v1 *wlr_single_pixel_buffer_manager_v1_create(
struct wl_display *display);
#endif

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@ -21,6 +21,7 @@ protocols = {
'xdg-activation-v1': wl_protocol_dir / 'staging/xdg-activation/xdg-activation-v1.xml',
'drm-lease-v1': wl_protocol_dir / 'staging/drm-lease/drm-lease-v1.xml',
'ext-session-lock-v1': wl_protocol_dir / 'staging/ext-session-lock/ext-session-lock-v1.xml',
'single-pixel-buffer-v1': wl_protocol_dir / 'staging/single-pixel-buffer/single-pixel-buffer-v1.xml',
# Unstable upstream protocols
'fullscreen-shell-unstable-v1': wl_protocol_dir / 'unstable/fullscreen-shell/fullscreen-shell-unstable-v1.xml',

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@ -63,6 +63,7 @@ wlr_files += files(
'wlr_screencopy_v1.c',
'wlr_server_decoration.c',
'wlr_session_lock_v1.c',
'wlr_single_pixel_buffer_v1.c',
'wlr_subcompositor.c',
'wlr_switch.c',
'wlr_tablet_pad.c',

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@ -0,0 +1,172 @@
#include <assert.h>
#include <drm_fourcc.h>
#include <stdlib.h>
#include <wlr/interfaces/wlr_buffer.h>
#include <wlr/types/wlr_buffer.h>
#include <wlr/types/wlr_single_pixel_buffer_v1.h>
#include "single-pixel-buffer-v1-protocol.h"
#define SINGLE_PIXEL_MANAGER_VERSION 1
struct wlr_single_pixel_buffer_manager_v1 {
struct wl_global *global;
struct wl_listener display_destroy;
};
struct wlr_single_pixel_buffer_v1 {
struct wlr_buffer base;
struct wl_resource *resource;
uint32_t r, g, b, a;
uint8_t argb8888[4]; // packed little-endian DRM_FORMAT_ARGB8888
};
static void destroy_resource(struct wl_client *client,
struct wl_resource *resource) {
wl_resource_destroy(resource);
}
static const struct wl_buffer_interface wl_buffer_impl = {
.destroy = destroy_resource,
};
static const struct wlr_buffer_impl buffer_impl;
static bool buffer_resource_is_instance(struct wl_resource *resource) {
return wl_resource_instance_of(resource, &wl_buffer_interface,
&wl_buffer_impl);
}
static struct wlr_single_pixel_buffer_v1 *single_pixel_buffer_v1_from_resource(
struct wl_resource *resource) {
assert(buffer_resource_is_instance(resource));
return wl_resource_get_user_data(resource);
}
static struct wlr_buffer *buffer_from_resource(
struct wl_resource *resource) {
return &single_pixel_buffer_v1_from_resource(resource)->base;
}
static const struct wlr_buffer_resource_interface buffer_resource_interface = {
.name = "single_pixel_buffer_v1",
.is_instance = buffer_resource_is_instance,
.from_resource = buffer_from_resource,
};
static void buffer_destroy(struct wlr_buffer *wlr_buffer) {
struct wlr_single_pixel_buffer_v1 *buffer =
wl_container_of(wlr_buffer, buffer, base);
if (buffer->resource != NULL) {
wl_resource_set_user_data(buffer->resource, NULL);
}
free(buffer);
}
static bool buffer_begin_data_ptr_access(struct wlr_buffer *wlr_buffer,
uint32_t flags, void **data, uint32_t *format, size_t *stride) {
struct wlr_single_pixel_buffer_v1 *buffer =
wl_container_of(wlr_buffer, buffer, base);
if (flags & ~WLR_BUFFER_DATA_PTR_ACCESS_READ) {
return false; // the buffer is read-only
}
*data = &buffer->argb8888;
*format = DRM_FORMAT_ARGB8888;
*stride = sizeof(buffer->argb8888);
return true;
}
static void buffer_end_data_ptr_access(struct wlr_buffer *wlr_buffer) {
// This space is intentionally left blank
}
static const struct wlr_buffer_impl buffer_impl = {
.destroy = buffer_destroy,
.begin_data_ptr_access = buffer_begin_data_ptr_access,
.end_data_ptr_access = buffer_end_data_ptr_access,
};
static void buffer_handle_resource_destroy(struct wl_resource *resource) {
struct wlr_single_pixel_buffer_v1 *buffer = single_pixel_buffer_v1_from_resource(resource);
buffer->resource = NULL;
wlr_buffer_drop(&buffer->base);
}
static void manager_handle_create_u32_rgba_buffer(struct wl_client *client,
struct wl_resource *resource, uint32_t id, uint32_t r, uint32_t g,
uint32_t b, uint32_t a) {
struct wlr_single_pixel_buffer_v1 *buffer = calloc(1, sizeof(*buffer));
if (buffer == NULL) {
wl_client_post_no_memory(client);
return;
}
buffer->resource = wl_resource_create(client, &wl_buffer_interface, 1, id);
if (buffer->resource == NULL) {
wl_client_post_no_memory(client);
free(buffer);
return;
}
wlr_buffer_init(&buffer->base, &buffer_impl, 1, 1);
wl_resource_set_implementation(buffer->resource,
&wl_buffer_impl, buffer, buffer_handle_resource_destroy);
buffer->r = r;
buffer->g = g;
buffer->b = b;
buffer->a = a;
double f = (double)0xFF / 0xFFFFFFFF;
buffer->argb8888[0] = (uint8_t)((double)buffer->b * f);
buffer->argb8888[1] = (uint8_t)((double)buffer->g * f);
buffer->argb8888[2] = (uint8_t)((double)buffer->r * f);
buffer->argb8888[3] = (uint8_t)((double)buffer->a * f);
}
static const struct wp_single_pixel_buffer_manager_v1_interface manager_impl = {
.destroy = destroy_resource,
.create_u32_rgba_buffer = manager_handle_create_u32_rgba_buffer,
};
static void manager_bind(struct wl_client *client, void *data,
uint32_t version, uint32_t id) {
struct wl_resource *resource = wl_resource_create(client,
&wp_single_pixel_buffer_manager_v1_interface, version, id);
if (resource == NULL) {
wl_client_post_no_memory(client);
return;
}
wl_resource_set_implementation(resource, &manager_impl, NULL, NULL);
}
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_single_pixel_buffer_manager_v1 *manager =
wl_container_of(listener, manager, display_destroy);
wl_global_destroy(manager->global);
free(manager);
}
struct wlr_single_pixel_buffer_manager_v1 *wlr_single_pixel_buffer_manager_v1_create(
struct wl_display *display) {
struct wlr_single_pixel_buffer_manager_v1 *manager = calloc(1, sizeof(*manager));
if (manager == NULL) {
return NULL;
}
manager->global = wl_global_create(display,
&wp_single_pixel_buffer_manager_v1_interface,
SINGLE_PIXEL_MANAGER_VERSION,
NULL, manager_bind);
if (manager->global == NULL) {
free(manager);
return NULL;
}
manager->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &manager->display_destroy);
wlr_buffer_register_resource_interface(&buffer_resource_interface);
return manager;
}