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#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <math.h>
#include <cairo.h>
#include <glib.h>
#include "wayland-client.h"
#include "wayland-glib.h"
#include "cairo-util.h"
static const char gem_device[] = "/dev/dri/card0";
static const char socket_name[] = "\0wayland";
static void
pointer_path(cairo_t *cr, int x, int y)
{
const int end = 4, tx = 2, ty = 7, dx = 3, dy = 5;
const int width = 16, height = 16;
cairo_move_to(cr, x, y);
cairo_line_to(cr, x + tx, y + ty);
cairo_line_to(cr, x + dx, y + dy);
cairo_line_to(cr, x + width - end, y + height);
cairo_line_to(cr, x + width, y + height - end);
cairo_line_to(cr, x + dy, y + dx);
cairo_line_to(cr, x + ty, y + tx);
cairo_close_path(cr);
}
static void *
draw_pointer(int width, int height)
{
const int hotspot_x = 16, hotspot_y = 16;
cairo_surface_t *surface;
cairo_t *cr;
surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
width, height);
cr = cairo_create(surface);
pointer_path(cr, hotspot_x + 3, hotspot_y + 2);
cairo_set_line_width (cr, 2);
cairo_set_source_rgb(cr, 0, 0, 0);
cairo_stroke_preserve(cr);
cairo_fill(cr);
blur_surface(surface, INT_MAX);
pointer_path(cr, hotspot_x, hotspot_y);
cairo_stroke_preserve(cr);
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_fill(cr);
cairo_destroy(cr);
return surface;
}
struct pointer {
int width, height;
struct wl_surface *surface;
};
static void
event_handler(struct wl_display *display,
uint32_t opcode,
uint32_t arg1, uint32_t arg2, void *data)
{
struct pointer *pointer = data;
if (opcode == 0)
wl_surface_map(pointer->surface, arg1, arg2, pointer->width, pointer->height);
}
int main(int argc, char *argv[])
{
struct wl_display *display;
struct pointer pointer;
int fd;
cairo_surface_t *s;
GMainLoop *loop;
GSource *source;
struct buffer *buffer;
fd = open(gem_device, O_RDWR);
if (fd < 0) {
fprintf(stderr, "drm open failed: %m\n");
return -1;
}
display = wl_display_create(socket_name);
if (display == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return -1;
}
loop = g_main_loop_new(NULL, FALSE);
source = wayland_source_new(display);
g_source_attach(source, NULL);
pointer.width = 48;
pointer.height = 48;
pointer.surface = wl_display_create_surface(display);
s = draw_pointer(pointer.width, pointer.height);
buffer = buffer_create_from_cairo_surface(fd, s);
wl_surface_attach(pointer.surface, buffer->name,
buffer->width, buffer->height, buffer->stride);
wl_surface_map(pointer.surface, 512, 384, pointer.width, pointer.height);
wl_display_set_event_handler(display, event_handler, &pointer);
g_main_loop_run(loop);
return 0;
}
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