static void fb_shutdown_palette(void)
{
if (have_cmap)
{
if (fb_active)
set_palette(&old_palette);
free_palette(&old_palette);
free_palette(&global_pal);
}
}
int dragon_draw_pthread(char **canvas, struct rgb *image, int width, int height, uint64_t size, int nb_thread)
{
printf("Started dragon_draw_pthread\n");
pthread_t *threads = NULL;
pthread_barrier_t barrier;
limits_t limits;
struct draw_data info;
char *dragon = NULL;
int scale_x;
int scale_y;
struct draw_data *data = NULL;
struct palette *palette = NULL;
int ret = 0;
palette = init_palette(nb_thread);
if (palette == NULL)
goto err;
if (pthread_barrier_init(&barrier, NULL, nb_thread) != 0) {
printf("barrier init error\n");
goto err;
}
/* 1. Calculer les limites du dragon */
if (dragon_limits_pthread(&limits, size, nb_thread) < 0)
goto err;
info.dragon_width = limits.maximums.x - limits.minimums.x;
info.dragon_height = limits.maximums.y - limits.minimums.y;
if ((dragon = (char *) malloc(info.dragon_width * info.dragon_height)) == NULL) {
printf("malloc error dragon\n");
goto err;
}
if ((data = malloc(sizeof(struct draw_data) * nb_thread)) == NULL) {
printf("malloc error data\n");
goto err;
}
if ((threads = malloc(sizeof(pthread_t) * nb_thread)) == NULL) {
printf("malloc error threads\n");
goto err;
}
info.image_height = height;
info.image_width = width;
scale_x = info.dragon_width / width + 1;
scale_y = info.dragon_height / height + 1;
info.scale = (scale_x > scale_y ? scale_x : scale_y);
info.deltaJ = (info.scale * width - info.dragon_width) / 2;
info.deltaI = (info.scale * height - info.dragon_height) / 2;
info.nb_thread = nb_thread;
info.dragon = dragon;
info.image = image;
info.size = size;
info.limits = limits;
info.barrier = &barrier;
info.palette = palette;
//int area = info.dragon_width * info.dragon_height;
//printf("-----------------\n");
//printf("Total area size: %d\n", area);
//printf("Draw area block size: %d\n", area / nb_thread);
//printf("-----------------\n");
//printf("Total draw size:%" PRIu64 "\n", size);
//printf("Draw block size:%" PRIu64 "\n", size / nb_thread);
//printf("-----------------\n");
//printf("Total scale size: %d\n", info.image_height);
//printf("Scale block size: %d\n", info.image_height / nb_thread);
//printf("-----------------\n");
/* 2. Lancement du calcul parallèle principal avec draw_dragon_worker */
int i = 0;
for (; i < nb_thread; ++i)
{
data[i].image_height = info.image_height;
data[i].image_width = info.image_width;
data[i].scale = info.scale;
data[i].deltaJ = info.deltaJ;
data[i].deltaI = info.deltaI;
data[i].dragon = info.dragon;
data[i].dragon_width = info.dragon_width;
data[i].dragon_height = info.dragon_height;
data[i].image = info.image;
data[i].size = info.size;
data[i].limits = info.limits;
data[i].barrier = info.barrier;
data[i].palette = info.palette;
data[i].id = i;
data[i].nb_thread = info.nb_thread;
pthread_create(&threads[i], NULL, dragon_draw_worker, &data[i]);
}
/* 3. Attendre la fin du traitement */
for (i = 0; i < nb_thread; ++i)
{
pthread_join(threads[i], NULL);
}
if (pthread_barrier_destroy(&barrier) != 0) {
printf("barrier destroy error\n");
goto err;
}
printf("Finished dragon_draw_pthread\n");
done:
FREE(data);
FREE(threads);
free_palette(palette);
*canvas = dragon;
return ret;
err:
FREE(dragon);
ret = -1;
goto done;
}