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output: add damage tracking via buffer age

This commit is contained in:
emersion 2018-01-21 00:06:35 +01:00
parent 78c13ead16
commit 0365b587f0
No known key found for this signature in database
GPG Key ID: 0FDE7BE0E88F5E48
21 changed files with 163 additions and 81 deletions
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13
backend/drm/drm.c
View File

@ -183,12 +183,13 @@ void wlr_drm_resources_free(struct wlr_drm_backend *drm) {
free(drm->planes);
}
static void wlr_drm_connector_make_current(struct wlr_output *output) {
static bool wlr_drm_connector_make_current(struct wlr_output *output,
int *buffer_age) {
struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
wlr_drm_surface_make_current(&conn->crtc->primary->surf);
return wlr_drm_surface_make_current(&conn->crtc->primary->surf, buffer_age);
}
static void wlr_drm_connector_swap_buffers(struct wlr_output *output) {
static bool wlr_drm_connector_swap_buffers(struct wlr_output *output) {
struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
@ -203,7 +204,7 @@ static void wlr_drm_connector_swap_buffers(struct wlr_output *output) {
if (conn->pageflip_pending) {
wlr_log(L_ERROR, "Skipping pageflip");
return;
return true;
}
if (drm->iface->crtc_pageflip(drm, conn, crtc, fb_id, NULL)) {
@ -212,6 +213,8 @@ static void wlr_drm_connector_swap_buffers(struct wlr_output *output) {
wl_event_source_timer_update(conn->retry_pageflip,
1000000.0f / conn->output.current_mode->refresh);
}
return true;
}
static void wlr_drm_connector_set_gamma(struct wlr_output *output,
@ -595,7 +598,7 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
return false;
}
wlr_drm_surface_make_current(&plane->surf);
wlr_drm_surface_make_current(&plane->surf, NULL);
wlr_texture_upload_pixels(plane->wlr_tex, WL_SHM_FORMAT_ARGB8888,
stride, width, height, buf);

17
backend/drm/renderer.c
View File

@ -113,9 +113,9 @@ void wlr_drm_surface_finish(struct wlr_drm_surface *surf) {
memset(surf, 0, sizeof(*surf));
}
void wlr_drm_surface_make_current(struct wlr_drm_surface *surf) {
eglMakeCurrent(surf->renderer->egl.display, surf->egl, surf->egl,
surf->renderer->egl.context);
bool wlr_drm_surface_make_current(struct wlr_drm_surface *surf,
int *buffer_damage) {
return wlr_egl_make_current(&surf->renderer->egl, surf->egl, buffer_damage);
}
struct gbm_bo *wlr_drm_surface_swap_buffers(struct wlr_drm_surface *surf) {
@ -123,7 +123,9 @@ struct gbm_bo *wlr_drm_surface_swap_buffers(struct wlr_drm_surface *surf) {
gbm_surface_release_buffer(surf->gbm, surf->front);
}
eglSwapBuffers(surf->renderer->egl.display, surf->egl);
if (!eglSwapBuffers(surf->renderer->egl.display, surf->egl)) {
wlr_log(L_ERROR, "eglSwapBuffers failed");
}
surf->front = surf->back;
surf->back = gbm_surface_lock_front_buffer(surf->gbm);
@ -135,7 +137,7 @@ struct gbm_bo *wlr_drm_surface_get_front(struct wlr_drm_surface *surf) {
return surf->front;
}
wlr_drm_surface_make_current(surf);
wlr_drm_surface_make_current(surf, NULL);
glViewport(0, 0, surf->width, surf->height);
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
@ -207,8 +209,9 @@ static struct wlr_texture *get_tex_for_bo(struct wlr_drm_renderer *renderer, str
return tex->tex;
}
struct gbm_bo *wlr_drm_surface_mgpu_copy(struct wlr_drm_surface *dest, struct gbm_bo *src) {
wlr_drm_surface_make_current(dest);
struct gbm_bo *wlr_drm_surface_mgpu_copy(struct wlr_drm_surface *dest,
struct gbm_bo *src) {
wlr_drm_surface_make_current(dest, NULL);
struct wlr_texture *tex = get_tex_for_bo(dest->renderer, src);

13
backend/headless/output.c
View File

@ -48,18 +48,15 @@ static void output_transform(struct wlr_output *wlr_output,
output->wlr_output.transform = transform;
}
static void output_make_current(struct wlr_output *wlr_output) {
static bool output_make_current(struct wlr_output *wlr_output, int *buffer_age) {
struct wlr_headless_output *output =
(struct wlr_headless_output *)wlr_output;
if (!eglMakeCurrent(output->backend->egl.display,
output->egl_surface, output->egl_surface,
output->backend->egl.context)) {
wlr_log(L_ERROR, "eglMakeCurrent failed: %s", egl_error());
}
return wlr_egl_make_current(&output->backend->egl, output->egl_surface,
buffer_age);
}
static void output_swap_buffers(struct wlr_output *wlr_output) {
// No-op
static bool output_swap_buffers(struct wlr_output *wlr_output) {
return true; // No-op
}
static void output_destroy(struct wlr_output *wlr_output) {

23
backend/wayland/output.c
View File

@ -38,22 +38,27 @@ static bool wlr_wl_output_set_custom_mode(struct wlr_output *_output,
return true;
}
static void wlr_wl_output_make_current(struct wlr_output *_output) {
struct wlr_wl_backend_output *output = (struct wlr_wl_backend_output *)_output;
if (!eglMakeCurrent(output->backend->egl.display,
output->egl_surface, output->egl_surface,
output->backend->egl.context)) {
wlr_log(L_ERROR, "eglMakeCurrent failed: %s", egl_error());
}
static bool wlr_wl_output_make_current(struct wlr_output *wlr_output,
int *buffer_age) {
struct wlr_wl_backend_output *output =
(struct wlr_wl_backend_output *)wlr_output;
return wlr_egl_make_current(&output->backend->egl, output->egl_surface,
buffer_age);
}
static void wlr_wl_output_swap_buffers(struct wlr_output *_output) {
struct wlr_wl_backend_output *output = (struct wlr_wl_backend_output *)_output;
static bool wlr_wl_output_swap_buffers(struct wlr_output *wlr_output) {
struct wlr_wl_backend_output *output =
(struct wlr_wl_backend_output *)wlr_output;
output->frame_callback = wl_surface_frame(output->surface);
wl_callback_add_listener(output->frame_callback, &frame_listener, output);
if (!eglSwapBuffers(output->backend->egl.display, output->egl_surface)) {
wlr_log(L_ERROR, "eglSwapBuffers failed: %s", egl_error());
return false;
}
return true;
}
static void wlr_wl_output_transform(struct wlr_output *_output,

15
backend/x11/backend.c
View File

@ -379,28 +379,23 @@ static void output_destroy(struct wlr_output *wlr_output) {
// output has been allocated on the stack, do not free it
}
static void output_make_current(struct wlr_output *wlr_output) {
static bool output_make_current(struct wlr_output *wlr_output, int *buffer_age) {
struct wlr_x11_output *output = (struct wlr_x11_output *)wlr_output;
struct wlr_x11_backend *x11 = output->x11;
if (!eglMakeCurrent(x11->egl.display, output->surf, output->surf, x11->egl.context)) {
wlr_log(L_ERROR, "eglMakeCurrent failed: %s", egl_error());
}
return wlr_egl_make_current(&x11->egl, output->surf, buffer_age);
}
static void output_swap_buffers(struct wlr_output *wlr_output) {
static bool output_swap_buffers(struct wlr_output *wlr_output) {
struct wlr_x11_output *output = (struct wlr_x11_output *)wlr_output;
struct wlr_x11_backend *x11 = output->x11;
if (!eglSwapBuffers(x11->egl.display, output->surf)) {
wlr_log(L_ERROR, "eglSwapBuffers failed: %s", egl_error());
return false;
}
// Damage the whole output
// TODO: use the buffer age extension
pixman_region32_union_rect(&wlr_output->damage, &wlr_output->damage,
0, 0, wlr_output->width, wlr_output->height);
wlr_output_update_needs_swap(wlr_output);
return true;
}
static struct wlr_output_impl output_impl = {

2
examples/multi-pointer.c
View File

@ -56,7 +56,7 @@ static void handle_output_frame(struct output_state *output,
struct sample_state *sample = state->data;
struct wlr_output *wlr_output = output->output;
wlr_output_make_current(wlr_output);
wlr_output_make_current(wlr_output, NULL);
glClearColor(sample->clear_color[0], sample->clear_color[1],
sample->clear_color[2], sample->clear_color[3]);

2
examples/output-layout.c
View File

@ -100,7 +100,7 @@ static void handle_output_frame(struct output_state *output,
struct sample_state *sample = state->data;
struct wlr_output *wlr_output = output->output;
wlr_output_make_current(wlr_output);
wlr_output_make_current(wlr_output, NULL);
wlr_renderer_begin(sample->renderer, wlr_output);
animate_cat(sample, output->output);

2
examples/pointer.c
View File

@ -85,7 +85,7 @@ static void handle_output_frame(struct output_state *output,
struct sample_state *sample = state->data;
struct wlr_output *wlr_output = output->output;
wlr_output_make_current(wlr_output);
wlr_output_make_current(wlr_output, NULL);
glClearColor(sample->clear_color[0], sample->clear_color[1],
sample->clear_color[2], sample->clear_color[3]);

2
examples/rotation.c
View File

@ -42,7 +42,7 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
int32_t width, height;
wlr_output_effective_resolution(wlr_output, &width, &height);
wlr_output_make_current(wlr_output);
wlr_output_make_current(wlr_output, NULL);
wlr_renderer_begin(sample->renderer, wlr_output);
float matrix[16];

2
examples/simple.c
View File

@ -35,7 +35,7 @@ void handle_output_frame(struct output_state *output, struct timespec *ts) {
sample->dec = inc;
}
wlr_output_make_current(output->output);
wlr_output_make_current(output->output, NULL);
glClearColor(sample->color[0], sample->color[1], sample->color[2], 1.0);
glClear(GL_COLOR_BUFFER_BIT);

2
examples/tablet.c
View File

@ -42,7 +42,7 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
int32_t width, height;
wlr_output_effective_resolution(wlr_output, &width, &height);
wlr_output_make_current(wlr_output);
wlr_output_make_current(wlr_output, NULL);
wlr_renderer_begin(sample->renderer, wlr_output);
float matrix[16], view[16];

2
examples/touch.c
View File

@ -41,7 +41,7 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
int32_t width, height;
wlr_output_effective_resolution(wlr_output, &width, &height);
wlr_output_make_current(wlr_output);
wlr_output_make_current(wlr_output, NULL);
wlr_renderer_begin(sample->renderer, wlr_output);
float matrix[16];

2
include/backend/drm/renderer.h
View File

@ -45,7 +45,7 @@ bool wlr_drm_plane_surfaces_init(struct wlr_drm_plane *plane, struct wlr_drm_bac
int32_t width, uint32_t height, uint32_t format);
void wlr_drm_surface_finish(struct wlr_drm_surface *surf);
void wlr_drm_surface_make_current(struct wlr_drm_surface *surf);
bool wlr_drm_surface_make_current(struct wlr_drm_surface *surf, int *buffer_age);
struct gbm_bo *wlr_drm_surface_swap_buffers(struct wlr_drm_surface *surf);
struct gbm_bo *wlr_drm_surface_get_front(struct wlr_drm_surface *surf);
void wlr_drm_surface_post(struct wlr_drm_surface *surf);

7
include/rootston/output.h
View File

@ -5,6 +5,8 @@
#include <pixman.h>
#include <wayland-server.h>
#define ROOTS_OUTPUT_PREVIOUS_DAMAGE_LEN 2
struct roots_desktop;
struct roots_output {
@ -15,9 +17,12 @@ struct roots_output {
struct roots_view *fullscreen_view;
struct timespec last_frame;
pixman_region32_t damage, previous_damage;
pixman_region32_t damage;
bool frame_pending;
pixman_region32_t previous_damage[ROOTS_OUTPUT_PREVIOUS_DAMAGE_LEN];
size_t previous_damage_idx;
struct wl_listener frame;
struct wl_listener mode;
struct wl_listener needs_swap;

4
include/wlr/interfaces/wlr_output.h
View File

@ -18,8 +18,8 @@ struct wlr_output_impl {
int32_t hotspot_x, int32_t hotspot_y, bool update_pixels);
bool (*move_cursor)(struct wlr_output *output, int x, int y);
void (*destroy)(struct wlr_output *output);
void (*make_current)(struct wlr_output *output);
void (*swap_buffers)(struct wlr_output *output);
bool (*make_current)(struct wlr_output *output, int *buffer_age);
bool (*swap_buffers)(struct wlr_output *output);
void (*set_gamma)(struct wlr_output *output,
uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b);
uint32_t (*get_gamma_size)(struct wlr_output *output);

14
include/wlr/render/egl.h
View File

@ -11,8 +11,12 @@ struct wlr_egl {
EGLConfig config;
EGLContext context;
const char *egl_exts;
const char *gl_exts;
const char *egl_exts_str;
const char *gl_exts_str;
struct {
bool buffer_age;
} egl_exts;
struct wl_display *wl_display;
};
@ -65,4 +69,10 @@ bool wlr_egl_destroy_image(struct wlr_egl *egl, EGLImageKHR image);
*/
const char *egl_error(void);
bool wlr_egl_make_current(struct wlr_egl *egl, EGLSurface surface,
int *buffer_age);
// TODO: remove
int wlr_egl_get_buffer_age(struct wlr_egl *egl, EGLSurface surface);
#endif

14
include/wlr/types/wlr_output.h
View File

@ -33,6 +33,8 @@ struct wlr_output_cursor {
struct wl_listener surface_destroy;
};
#define WLR_OUTPUT_PREVIOUS_DAMAGE_COUNT 2
struct wlr_output_impl;
struct wlr_output {
@ -55,7 +57,7 @@ struct wlr_output {
enum wl_output_transform transform;
bool needs_swap;
pixman_region32_t damage, previous_damage;
pixman_region32_t damage;
float transform_matrix[16];
// Note: some backends may have zero modes
@ -104,13 +106,19 @@ void wlr_output_set_scale(struct wlr_output *output, float scale);
void wlr_output_destroy(struct wlr_output *output);
void wlr_output_effective_resolution(struct wlr_output *output,
int *width, int *height);
void wlr_output_make_current(struct wlr_output *output);
/**
* Makes the output GL context current.
*
* `buffer_age` is set to the drawing buffer age in number of frames or -1 if
* unknown.
*/
bool wlr_output_make_current(struct wlr_output *output, int *buffer_age);
/**
* Swaps the output buffers. If the time of the frame isn't known, set `when` to
* NULL. If the compositor doesn't support damage tracking, set `damage` to
* NULL.
*/
void wlr_output_swap_buffers(struct wlr_output *output, struct timespec *when,
bool wlr_output_swap_buffers(struct wlr_output *output, struct timespec *when,
pixman_region32_t *damage);
void wlr_output_set_gamma(struct wlr_output *output,
uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b);

50
render/egl.c
View File

@ -127,18 +127,23 @@ bool wlr_egl_init(struct wlr_egl *egl, EGLenum platform, void *remote_display,
}
eglMakeCurrent(egl->display, EGL_NO_SURFACE, EGL_NO_SURFACE, egl->context);
egl->egl_exts = eglQueryString(egl->display, EGL_EXTENSIONS);
if (strstr(egl->egl_exts, "EGL_WL_bind_wayland_display") == NULL ||
strstr(egl->egl_exts, "EGL_KHR_image_base") == NULL) {
egl->egl_exts_str = eglQueryString(egl->display, EGL_EXTENSIONS);
egl->gl_exts_str = (const char*) glGetString(GL_EXTENSIONS);
wlr_log(L_INFO, "Using EGL %d.%d", (int)major, (int)minor);
wlr_log(L_INFO, "Supported EGL extensions: %s", egl->egl_exts_str);
wlr_log(L_INFO, "Using %s", glGetString(GL_VERSION));
wlr_log(L_INFO, "Supported OpenGL ES extensions: %s", egl->gl_exts_str);
if (strstr(egl->egl_exts_str, "EGL_WL_bind_wayland_display") == NULL ||
strstr(egl->egl_exts_str, "EGL_KHR_image_base") == NULL) {
wlr_log(L_ERROR, "Required egl extensions not supported");
goto error;
}
egl->gl_exts = (const char*) glGetString(GL_EXTENSIONS);
wlr_log(L_INFO, "Using EGL %d.%d", (int)major, (int)minor);
wlr_log(L_INFO, "Supported EGL extensions: %s", egl->egl_exts);
wlr_log(L_INFO, "Using %s", glGetString(GL_VERSION));
wlr_log(L_INFO, "Supported OpenGL ES extensions: %s", egl->gl_exts);
egl->egl_exts.buffer_age =
strstr(egl->egl_exts_str, "EGL_EXT_buffer_age") != NULL;
return true;
error:
@ -208,3 +213,32 @@ EGLSurface wlr_egl_create_surface(struct wlr_egl *egl, void *window) {
}
return surf;
}
int wlr_egl_get_buffer_age(struct wlr_egl *egl, EGLSurface surface) {
if (!egl->egl_exts.buffer_age) {
return -1;
}
EGLint buffer_age;
EGLBoolean ok = eglQuerySurface(egl->display, surface,
EGL_BUFFER_AGE_EXT, &buffer_age);
if (!ok) {
wlr_log(L_ERROR, "Failed to get EGL surface buffer age: %s", egl_error());
return -1;
}
return buffer_age;
}
bool wlr_egl_make_current(struct wlr_egl *egl, EGLSurface surface,
int *buffer_age) {
if (!eglMakeCurrent(egl->display, surface, surface, egl->context)) {
wlr_log(L_ERROR, "eglMakeCurrent failed: %s", egl_error());
return false;
}
if (buffer_age != NULL) {
*buffer_age = wlr_egl_get_buffer_age(egl, surface);
}
return true;
}

35
rootston/output.c
View File

@ -294,11 +294,26 @@ static void render_output(struct roots_output *output) {
wlr_output_set_fullscreen_surface(wlr_output, NULL);
}
int buffer_age = -1;
wlr_output_make_current(wlr_output, &buffer_age);
pixman_region32_t damage;
pixman_region32_init(&damage);
pixman_region32_union(&damage, &output->damage, &output->previous_damage);
pixman_region32_intersect_rect(&damage, &damage, 0, 0, wlr_output->width,
wlr_output->height);
if (buffer_age <= 0 || buffer_age - 1 > ROOTS_OUTPUT_PREVIOUS_DAMAGE_LEN) {
// Buffer new or too old, damage the whole output
pixman_region32_union_rect(&damage, &damage, 0, 0,
wlr_output->width, wlr_output->height);
} else {
pixman_region32_copy(&damage, &output->damage);
size_t idx = output->previous_damage_idx;
for (int i = 0; i < buffer_age - 1; i++) {
int j = (idx + i) % ROOTS_OUTPUT_PREVIOUS_DAMAGE_LEN;
pixman_region32_union(&damage, &damage, &output->previous_damage[j]);
}
}
pixman_region32_intersect_rect(&damage, &damage, 0, 0,
wlr_output->width, wlr_output->height);
if (!pixman_region32_not_empty(&damage) && !wlr_output->needs_swap) {
// Output doesn't need swap and isn't damaged, skip rendering completely
@ -308,7 +323,6 @@ static void render_output(struct roots_output *output) {
wlr_log(L_DEBUG, "render");
wlr_output_make_current(wlr_output);
wlr_renderer_begin(server->renderer, wlr_output);
glEnable(GL_SCISSOR_TEST);
@ -384,7 +398,10 @@ renderer_end:
wlr_renderer_end(server->renderer);
wlr_output_swap_buffers(wlr_output, &now, &damage);
output->frame_pending = true;
pixman_region32_copy(&output->previous_damage, &output->damage);
output->previous_damage_idx += ROOTS_OUTPUT_PREVIOUS_DAMAGE_LEN - 1;
output->previous_damage_idx %= ROOTS_OUTPUT_PREVIOUS_DAMAGE_LEN;
pixman_region32_copy(&output->previous_damage[output->previous_damage_idx],
&output->damage);
pixman_region32_clear(&output->damage);
output->last_frame = desktop->last_frame = now;
@ -551,7 +568,9 @@ void output_add_notify(struct wl_listener *listener, void *data) {
output->wlr_output = wlr_output;
wl_list_insert(&desktop->outputs, &output->link);
pixman_region32_init(&output->damage);
pixman_region32_init(&output->previous_damage);
for (size_t i = 0; i < ROOTS_OUTPUT_PREVIOUS_DAMAGE_LEN; ++i) {
pixman_region32_init(&output->previous_damage[i]);
}
output->frame.notify = output_handle_frame;
wl_signal_add(&wlr_output->events.frame, &output->frame);
@ -610,7 +629,9 @@ void output_remove_notify(struct wl_listener *listener, void *data) {
// sample->compositor);
pixman_region32_fini(&output->damage);
pixman_region32_fini(&output->previous_damage);
for (size_t i = 0; i < ROOTS_OUTPUT_PREVIOUS_DAMAGE_LEN; ++i) {
pixman_region32_fini(&output->previous_damage[i]);
}
wl_list_remove(&output->link);
wl_list_remove(&output->frame.link);
wl_list_remove(&output->mode.link);

22
types/wlr_output.c
View File

@ -281,7 +281,6 @@ void wlr_output_init(struct wlr_output *output, struct wlr_backend *backend,
wl_signal_init(&output->events.transform);
wl_signal_init(&output->events.destroy);
pixman_region32_init(&output->damage);
pixman_region32_init(&output->previous_damage);
output->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &output->display_destroy);
@ -310,7 +309,6 @@ void wlr_output_destroy(struct wlr_output *output) {
}
pixman_region32_fini(&output->damage);
pixman_region32_fini(&output->previous_damage);
if (output->impl && output->impl->destroy) {
output->impl->destroy(output);
@ -332,8 +330,8 @@ void wlr_output_effective_resolution(struct wlr_output *output,
*height /= output->scale;
}
void wlr_output_make_current(struct wlr_output *output) {
output->impl->make_current(output);
bool wlr_output_make_current(struct wlr_output *output, int *buffer_age) {
return output->impl->make_current(output, buffer_age);
}
static void output_fullscreen_surface_get_box(struct wlr_output *output,
@ -466,17 +464,17 @@ surface_damage_finish:
pixman_region32_fini(&surface_damage);
}
void wlr_output_swap_buffers(struct wlr_output *output, struct timespec *when,
bool wlr_output_swap_buffers(struct wlr_output *output, struct timespec *when,
pixman_region32_t *damage) {
wl_signal_emit(&output->events.swap_buffers, damage);
pixman_region32_t *render_damage = damage;
if (damage == NULL) {
// Damage tracking not supported, repaint the whole output
pixman_region32_t output_damage;
pixman_region32_init(&output_damage);
pixman_region32_copy(&output_damage, &output->damage);
pixman_region32_union(&output_damage, &output_damage,
&output->previous_damage);
pixman_region32_union_rect(&output_damage, &output_damage,
0, 0, output->width, output->height);
render_damage = &output_damage;
}
@ -503,14 +501,18 @@ void wlr_output_swap_buffers(struct wlr_output *output, struct timespec *when,
}
// TODO: provide `damage` (not `render_damage`) to backend
output->impl->swap_buffers(output);
if (!output->impl->swap_buffers(output)) {
return false;
}
output->needs_swap = false;
pixman_region32_copy(&output->previous_damage, &output->damage);
pixman_region32_clear(&output->damage);
if (damage == NULL) {
pixman_region32_fini(render_damage);
}
return true;
}
void wlr_output_set_gamma(struct wlr_output *output,

1
types/wlr_screenshooter.c
View File

@ -47,7 +47,6 @@ static void output_frame_notify(struct wl_listener *listener, void *_data) {
struct wlr_renderer *renderer = state->screenshot->screenshooter->renderer;
struct wlr_output *output = state->screenshot->output;
wlr_output_make_current(output);
wlr_renderer_read_pixels(renderer, 0, 0, output->width, output->height,
state->pixels);