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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
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19
include/wlr/types/wlr_single_pixel_buffer_v1.h
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19
include/wlr/types/wlr_single_pixel_buffer_v1.h
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/*
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* This an unstable interface of wlroots. No guarantees are made regarding the
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* future consistency of this API.
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*/
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#ifndef WLR_USE_UNSTABLE
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#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
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#endif
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#ifndef WLR_TYPES_WLR_SINGLE_PIXEL_BUFFER_V1
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#define WLR_TYPES_WLR_SINGLE_PIXEL_BUFFER_V1
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#include <wayland-server-core.h>
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struct wlr_single_pixel_buffer_manager_v1;
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struct wlr_single_pixel_buffer_manager_v1 *wlr_single_pixel_buffer_manager_v1_create(
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struct wl_display *display);
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#endif
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@ -21,6 +21,7 @@ protocols = {
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'xdg-activation-v1': wl_protocol_dir / 'staging/xdg-activation/xdg-activation-v1.xml',
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'drm-lease-v1': wl_protocol_dir / 'staging/drm-lease/drm-lease-v1.xml',
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'ext-session-lock-v1': wl_protocol_dir / 'staging/ext-session-lock/ext-session-lock-v1.xml',
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'single-pixel-buffer-v1': wl_protocol_dir / 'staging/single-pixel-buffer/single-pixel-buffer-v1.xml',
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# Unstable upstream protocols
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'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(
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'wlr_screencopy_v1.c',
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'wlr_server_decoration.c',
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'wlr_session_lock_v1.c',
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'wlr_single_pixel_buffer_v1.c',
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'wlr_subcompositor.c',
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'wlr_switch.c',
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'wlr_tablet_pad.c',
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172
types/wlr_single_pixel_buffer_v1.c
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types/wlr_single_pixel_buffer_v1.c
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#include <assert.h>
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#include <drm_fourcc.h>
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#include <stdlib.h>
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#include <wlr/interfaces/wlr_buffer.h>
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#include <wlr/types/wlr_buffer.h>
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#include <wlr/types/wlr_single_pixel_buffer_v1.h>
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#include "single-pixel-buffer-v1-protocol.h"
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#define SINGLE_PIXEL_MANAGER_VERSION 1
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struct wlr_single_pixel_buffer_manager_v1 {
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struct wl_global *global;
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struct wl_listener display_destroy;
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};
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struct wlr_single_pixel_buffer_v1 {
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struct wlr_buffer base;
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struct wl_resource *resource;
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uint32_t r, g, b, a;
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uint8_t argb8888[4]; // packed little-endian DRM_FORMAT_ARGB8888
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};
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static void destroy_resource(struct wl_client *client,
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struct wl_resource *resource) {
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wl_resource_destroy(resource);
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}
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static const struct wl_buffer_interface wl_buffer_impl = {
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.destroy = destroy_resource,
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};
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static const struct wlr_buffer_impl buffer_impl;
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static bool buffer_resource_is_instance(struct wl_resource *resource) {
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return wl_resource_instance_of(resource, &wl_buffer_interface,
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&wl_buffer_impl);
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}
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static struct wlr_single_pixel_buffer_v1 *single_pixel_buffer_v1_from_resource(
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struct wl_resource *resource) {
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assert(buffer_resource_is_instance(resource));
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return wl_resource_get_user_data(resource);
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}
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static struct wlr_buffer *buffer_from_resource(
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struct wl_resource *resource) {
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return &single_pixel_buffer_v1_from_resource(resource)->base;
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}
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static const struct wlr_buffer_resource_interface buffer_resource_interface = {
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.name = "single_pixel_buffer_v1",
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.is_instance = buffer_resource_is_instance,
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.from_resource = buffer_from_resource,
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};
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static void buffer_destroy(struct wlr_buffer *wlr_buffer) {
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struct wlr_single_pixel_buffer_v1 *buffer =
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wl_container_of(wlr_buffer, buffer, base);
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if (buffer->resource != NULL) {
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wl_resource_set_user_data(buffer->resource, NULL);
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}
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free(buffer);
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}
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static bool buffer_begin_data_ptr_access(struct wlr_buffer *wlr_buffer,
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uint32_t flags, void **data, uint32_t *format, size_t *stride) {
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struct wlr_single_pixel_buffer_v1 *buffer =
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wl_container_of(wlr_buffer, buffer, base);
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if (flags & ~WLR_BUFFER_DATA_PTR_ACCESS_READ) {
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return false; // the buffer is read-only
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}
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*data = &buffer->argb8888;
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*format = DRM_FORMAT_ARGB8888;
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*stride = sizeof(buffer->argb8888);
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return true;
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}
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static void buffer_end_data_ptr_access(struct wlr_buffer *wlr_buffer) {
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// This space is intentionally left blank
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}
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static const struct wlr_buffer_impl buffer_impl = {
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.destroy = buffer_destroy,
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.begin_data_ptr_access = buffer_begin_data_ptr_access,
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.end_data_ptr_access = buffer_end_data_ptr_access,
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};
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static void buffer_handle_resource_destroy(struct wl_resource *resource) {
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struct wlr_single_pixel_buffer_v1 *buffer = single_pixel_buffer_v1_from_resource(resource);
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buffer->resource = NULL;
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wlr_buffer_drop(&buffer->base);
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}
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static void manager_handle_create_u32_rgba_buffer(struct wl_client *client,
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struct wl_resource *resource, uint32_t id, uint32_t r, uint32_t g,
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uint32_t b, uint32_t a) {
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struct wlr_single_pixel_buffer_v1 *buffer = calloc(1, sizeof(*buffer));
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if (buffer == NULL) {
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wl_client_post_no_memory(client);
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return;
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}
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buffer->resource = wl_resource_create(client, &wl_buffer_interface, 1, id);
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if (buffer->resource == NULL) {
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wl_client_post_no_memory(client);
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free(buffer);
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return;
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}
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wlr_buffer_init(&buffer->base, &buffer_impl, 1, 1);
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wl_resource_set_implementation(buffer->resource,
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&wl_buffer_impl, buffer, buffer_handle_resource_destroy);
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buffer->r = r;
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buffer->g = g;
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buffer->b = b;
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buffer->a = a;
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double f = (double)0xFF / 0xFFFFFFFF;
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buffer->argb8888[0] = (uint8_t)((double)buffer->b * f);
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buffer->argb8888[1] = (uint8_t)((double)buffer->g * f);
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buffer->argb8888[2] = (uint8_t)((double)buffer->r * f);
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buffer->argb8888[3] = (uint8_t)((double)buffer->a * f);
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}
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static const struct wp_single_pixel_buffer_manager_v1_interface manager_impl = {
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.destroy = destroy_resource,
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.create_u32_rgba_buffer = manager_handle_create_u32_rgba_buffer,
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};
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static void manager_bind(struct wl_client *client, void *data,
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uint32_t version, uint32_t id) {
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struct wl_resource *resource = wl_resource_create(client,
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&wp_single_pixel_buffer_manager_v1_interface, version, id);
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if (resource == NULL) {
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wl_client_post_no_memory(client);
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return;
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}
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wl_resource_set_implementation(resource, &manager_impl, NULL, NULL);
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}
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static void handle_display_destroy(struct wl_listener *listener, void *data) {
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struct wlr_single_pixel_buffer_manager_v1 *manager =
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wl_container_of(listener, manager, display_destroy);
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wl_global_destroy(manager->global);
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free(manager);
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}
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struct wlr_single_pixel_buffer_manager_v1 *wlr_single_pixel_buffer_manager_v1_create(
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struct wl_display *display) {
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struct wlr_single_pixel_buffer_manager_v1 *manager = calloc(1, sizeof(*manager));
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if (manager == NULL) {
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return NULL;
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}
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manager->global = wl_global_create(display,
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&wp_single_pixel_buffer_manager_v1_interface,
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SINGLE_PIXEL_MANAGER_VERSION,
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NULL, manager_bind);
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if (manager->global == NULL) {
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free(manager);
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return NULL;
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}
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manager->display_destroy.notify = handle_display_destroy;
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wl_display_add_destroy_listener(display, &manager->display_destroy);
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wlr_buffer_register_resource_interface(&buffer_resource_interface);
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return manager;
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}
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