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#define _POSIX_C_SOURCE 200112L
#include <stdbool.h>
#include <stdlib.h>
#include <time.h>
#include <cairo.h>
#include <drm_fourcc.h>
#include <wayland-server-core.h>
#include <wlr/backend.h>
#include <wlr/render/allocator.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_output.h>
#include <wlr/types/wlr_scene.h>
#include <wlr/util/log.h>
#include <wlr/interfaces/wlr_buffer.h>
/* Simple scene-graph example with a custom buffer drawn by Cairo.
*
* Input is unimplemented. Surfaces are unimplemented. */
struct cairo_buffer {
struct wlr_buffer base;
cairo_surface_t *surface;
};
static void cairo_buffer_destroy(struct wlr_buffer *wlr_buffer) {
struct cairo_buffer *buffer = wl_container_of(wlr_buffer, buffer, base);
cairo_surface_destroy(buffer->surface);
free(buffer);
}
static bool cairo_buffer_begin_data_ptr_access(struct wlr_buffer *wlr_buffer,
uint32_t flags, void **data, uint32_t *format, size_t *stride) {
struct cairo_buffer *buffer = wl_container_of(wlr_buffer, buffer, base);
if (flags & WLR_BUFFER_DATA_PTR_ACCESS_WRITE) {
return false;
}
*format = DRM_FORMAT_ARGB8888;
*data = cairo_image_surface_get_data(buffer->surface);
*stride = cairo_image_surface_get_stride(buffer->surface);
return true;
}
static void cairo_buffer_end_data_ptr_access(struct wlr_buffer *wlr_buffer) {
}
static const struct wlr_buffer_impl cairo_buffer_impl = {
.destroy = cairo_buffer_destroy,
.begin_data_ptr_access = cairo_buffer_begin_data_ptr_access,
.end_data_ptr_access = cairo_buffer_end_data_ptr_access
};
static struct cairo_buffer *create_cairo_buffer(int width, int height) {
struct cairo_buffer *buffer = calloc(1, sizeof(*buffer));
if (!buffer) {
return NULL;
}
wlr_buffer_init(&buffer->base, &cairo_buffer_impl, width, height);
buffer->surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
width, height);
if (cairo_surface_status(buffer->surface) != CAIRO_STATUS_SUCCESS) {
free(buffer);
return NULL;
}
return buffer;
}
struct server {
struct wl_display *display;
struct wlr_backend *backend;
struct wlr_renderer *renderer;
struct wlr_allocator *allocator;
struct wlr_scene *scene;
struct wl_listener new_output;
};
struct output {
struct wl_list link;
struct server *server;
struct wlr_output *wlr;
struct wlr_scene_output *scene_output;
struct wl_listener frame;
};
static void output_handle_frame(struct wl_listener *listener, void *data) {
struct output *output = wl_container_of(listener, output, frame);
wlr_scene_output_commit(output->scene_output, NULL);
}
static void server_handle_new_output(struct wl_listener *listener, void *data) {
struct server *server = wl_container_of(listener, server, new_output);
struct wlr_output *wlr_output = data;
wlr_output_init_render(wlr_output, server->allocator, server->renderer);
struct output *output = calloc(1, sizeof(struct output));
output->wlr = wlr_output;
output->server = server;
output->frame.notify = output_handle_frame;
wl_signal_add(&wlr_output->events.frame, &output->frame);
output->scene_output = wlr_scene_output_create(server->scene, wlr_output);
struct wlr_output_state state;
wlr_output_state_init(&state);
wlr_output_state_set_enabled(&state, true);
struct wlr_output_mode *mode = wlr_output_preferred_mode(wlr_output);
if (mode != NULL) {
wlr_output_state_set_mode(&state, mode);
}
wlr_output_commit_state(wlr_output, &state);
wlr_output_state_finish(&state);
}
int main(void) {
wlr_log_init(WLR_DEBUG, NULL);
struct server server = {0};
server.display = wl_display_create();
server.backend = wlr_backend_autocreate(server.display, NULL);
server.scene = wlr_scene_create();
server.renderer = wlr_renderer_autocreate(server.backend);
wlr_renderer_init_wl_display(server.renderer, server.display);
server.allocator = wlr_allocator_autocreate(server.backend,
server.renderer);
server.new_output.notify = server_handle_new_output;
wl_signal_add(&server.backend->events.new_output, &server.new_output);
if (!wlr_backend_start(server.backend)) {
wl_display_destroy(server.display);
return EXIT_FAILURE;
}
struct cairo_buffer *buffer = create_cairo_buffer(256, 256);
if (!buffer) {
wl_display_destroy(server.display);
return EXIT_FAILURE;
}
/* Begin drawing
* From cairo samples at https://www.cairographics.org/samples/ */
cairo_t *cr = cairo_create(buffer->surface);
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_paint(cr);
cairo_set_source_rgb(cr, 0, 0, 0);
double x = 25.6, y = 128.0;
double x1 = 102.4, y1 = 230.4,
x2 = 153.6, y2 = 25.6,
x3 = 230.4, y3 = 128.0;
cairo_move_to(cr, x, y);
cairo_curve_to(cr, x1, y1, x2, y2, x3, y3);
cairo_set_line_width(cr, 10.0);
cairo_stroke(cr);
cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.6);
cairo_set_line_width(cr, 6.0);
cairo_move_to(cr, x, y);
cairo_line_to(cr, x1, y1);
cairo_move_to(cr, x2, y2);
cairo_line_to(cr, x3, y3);
cairo_stroke(cr);
cairo_destroy(cr);
/* End drawing */
struct wlr_scene_buffer *scene_buffer = wlr_scene_buffer_create(
&server.scene->tree, &buffer->base);
if (!scene_buffer) {
wl_display_destroy(server.display);
return EXIT_FAILURE;
}
wlr_scene_node_set_position(&scene_buffer->node, 50, 50);
wlr_buffer_drop(&buffer->base);
wl_display_run(server.display);
wl_display_destroy(server.display);
return EXIT_SUCCESS;
}
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