wlroots-hyprland/types/output/output.c

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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <backend/backend.h>
#include <drm_fourcc.h>
#include <stdlib.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/render/swapchain.h>
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#include <wlr/types/wlr_compositor.h>
#include <wlr/types/wlr_matrix.h>
#include <wlr/types/wlr_output_layer.h>
#include <wlr/util/log.h>
#include "render/allocator/allocator.h"
#include "types/wlr_output.h"
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#include "util/env.h"
#include "util/global.h"
#define OUTPUT_VERSION 4
static void send_geometry(struct wl_resource *resource) {
struct wlr_output *output = wlr_output_from_resource(resource);
const char *make = output->make;
if (make == NULL) {
make = "Unknown";
}
const char *model = output->model;
if (model == NULL) {
model = "Unknown";
}
wl_output_send_geometry(resource, 0, 0,
output->phys_width, output->phys_height, output->subpixel,
make, model, output->transform);
}
static void send_current_mode(struct wl_resource *resource) {
struct wlr_output *output = wlr_output_from_resource(resource);
if (output->current_mode != NULL) {
struct wlr_output_mode *mode = output->current_mode;
wl_output_send_mode(resource, WL_OUTPUT_MODE_CURRENT,
mode->width, mode->height, mode->refresh);
} else {
// Output has no mode
wl_output_send_mode(resource, WL_OUTPUT_MODE_CURRENT, output->width,
output->height, output->refresh);
}
}
static void send_scale(struct wl_resource *resource) {
struct wlr_output *output = wlr_output_from_resource(resource);
uint32_t version = wl_resource_get_version(resource);
if (version >= WL_OUTPUT_SCALE_SINCE_VERSION) {
wl_output_send_scale(resource, (uint32_t)ceil(output->scale));
}
}
static void send_name(struct wl_resource *resource) {
struct wlr_output *output = wlr_output_from_resource(resource);
uint32_t version = wl_resource_get_version(resource);
if (version >= WL_OUTPUT_NAME_SINCE_VERSION) {
wl_output_send_name(resource, output->name);
}
}
static void send_description(struct wl_resource *resource) {
struct wlr_output *output = wlr_output_from_resource(resource);
uint32_t version = wl_resource_get_version(resource);
if (output->description != NULL &&
version >= WL_OUTPUT_DESCRIPTION_SINCE_VERSION) {
wl_output_send_description(resource, output->description);
}
}
static void send_done(struct wl_resource *resource) {
uint32_t version = wl_resource_get_version(resource);
if (version >= WL_OUTPUT_DONE_SINCE_VERSION) {
wl_output_send_done(resource);
}
}
static void output_handle_resource_destroy(struct wl_resource *resource) {
wl_list_remove(wl_resource_get_link(resource));
}
static void output_handle_release(struct wl_client *client,
struct wl_resource *resource) {
wl_resource_destroy(resource);
}
static const struct wl_output_interface output_impl = {
.release = output_handle_release,
};
static void output_bind(struct wl_client *wl_client, void *data,
uint32_t version, uint32_t id) {
// `output` can be NULL if the output global is being destroyed
struct wlr_output *output = data;
struct wl_resource *resource = wl_resource_create(wl_client,
&wl_output_interface, version, id);
if (resource == NULL) {
wl_client_post_no_memory(wl_client);
return;
}
wl_resource_set_implementation(resource, &output_impl, output,
output_handle_resource_destroy);
if (output == NULL) {
wl_list_init(wl_resource_get_link(resource));
return;
}
wl_list_insert(&output->resources, wl_resource_get_link(resource));
send_geometry(resource);
send_current_mode(resource);
send_scale(resource);
send_name(resource);
send_description(resource);
send_done(resource);
struct wlr_output_event_bind evt = {
.output = output,
.resource = resource,
};
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wl_signal_emit_mutable(&output->events.bind, &evt);
}
void wlr_output_create_global(struct wlr_output *output) {
if (output->global != NULL) {
return;
}
output->global = wl_global_create(output->display,
&wl_output_interface, OUTPUT_VERSION, output, output_bind);
if (output->global == NULL) {
wlr_log(WLR_ERROR, "Failed to allocate wl_output global");
}
}
void wlr_output_destroy_global(struct wlr_output *output) {
if (output->global == NULL) {
return;
}
// Make all output resources inert
struct wl_resource *resource, *tmp;
wl_resource_for_each_safe(resource, tmp, &output->resources) {
wl_resource_set_user_data(resource, NULL);
wl_list_remove(wl_resource_get_link(resource));
wl_list_init(wl_resource_get_link(resource));
}
wlr_global_destroy_safe(output->global);
output->global = NULL;
}
static void schedule_done_handle_idle_timer(void *data) {
struct wlr_output *output = data;
output->idle_done = NULL;
struct wl_resource *resource;
wl_resource_for_each(resource, &output->resources) {
send_done(resource);
}
}
void wlr_output_schedule_done(struct wlr_output *output) {
if (output->idle_done != NULL) {
return; // Already scheduled
}
struct wl_event_loop *ev = wl_display_get_event_loop(output->display);
output->idle_done =
wl_event_loop_add_idle(ev, schedule_done_handle_idle_timer, output);
}
struct wlr_output *wlr_output_from_resource(struct wl_resource *resource) {
assert(wl_resource_instance_of(resource, &wl_output_interface,
&output_impl));
return wl_resource_get_user_data(resource);
}
static void output_update_matrix(struct wlr_output *output) {
wlr_matrix_identity(output->transform_matrix);
if (output->transform != WL_OUTPUT_TRANSFORM_NORMAL) {
int tr_width, tr_height;
wlr_output_transformed_resolution(output, &tr_width, &tr_height);
wlr_matrix_translate(output->transform_matrix,
output->width / 2.0, output->height / 2.0);
wlr_matrix_transform(output->transform_matrix, output->transform);
wlr_matrix_translate(output->transform_matrix,
- tr_width / 2.0, - tr_height / 2.0);
}
}
void wlr_output_enable(struct wlr_output *output, bool enable) {
wlr_output_state_set_enabled(&output->pending, enable);
}
void wlr_output_set_mode(struct wlr_output *output,
struct wlr_output_mode *mode) {
wlr_output_state_set_mode(&output->pending, mode);
}
void wlr_output_set_custom_mode(struct wlr_output *output, int32_t width,
int32_t height, int32_t refresh) {
// If there is a fixed mode which matches what the user wants, use that
struct wlr_output_mode *mode;
wl_list_for_each(mode, &output->modes, link) {
if (mode->width == width && mode->height == height &&
mode->refresh == refresh) {
wlr_output_set_mode(output, mode);
return;
}
}
wlr_output_state_set_custom_mode(&output->pending, width, height, refresh);
}
void wlr_output_set_transform(struct wlr_output *output,
enum wl_output_transform transform) {
wlr_output_state_set_transform(&output->pending, transform);
}
void wlr_output_set_scale(struct wlr_output *output, float scale) {
wlr_output_state_set_scale(&output->pending, scale);
}
void wlr_output_enable_adaptive_sync(struct wlr_output *output, bool enabled) {
wlr_output_state_set_adaptive_sync_enabled(&output->pending, enabled);
}
void wlr_output_set_render_format(struct wlr_output *output, uint32_t format) {
wlr_output_state_set_render_format(&output->pending, format);
}
void wlr_output_set_subpixel(struct wlr_output *output,
enum wl_output_subpixel subpixel) {
wlr_output_state_set_subpixel(&output->pending, subpixel);
}
void wlr_output_set_name(struct wlr_output *output, const char *name) {
assert(output->global == NULL);
free(output->name);
output->name = strdup(name);
}
void wlr_output_set_description(struct wlr_output *output, const char *desc) {
if (output->description != NULL && desc != NULL &&
strcmp(output->description, desc) == 0) {
return;
}
free(output->description);
if (desc != NULL) {
output->description = strdup(desc);
} else {
output->description = NULL;
}
struct wl_resource *resource;
wl_resource_for_each(resource, &output->resources) {
send_description(resource);
}
wlr_output_schedule_done(output);
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wl_signal_emit_mutable(&output->events.description, output);
}
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_output *output =
wl_container_of(listener, output, display_destroy);
wlr_output_destroy_global(output);
}
static void output_state_move(struct wlr_output_state *dst,
struct wlr_output_state *src) {
*dst = *src;
wlr_output_state_init(src);
}
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static void output_apply_state(struct wlr_output *output,
const struct wlr_output_state *state) {
if (state->committed & WLR_OUTPUT_STATE_RENDER_FORMAT) {
output->render_format = state->render_format;
}
if (state->committed & WLR_OUTPUT_STATE_SUBPIXEL) {
output->subpixel = state->subpixel;
}
if (state->committed & WLR_OUTPUT_STATE_ENABLED) {
output->enabled = state->enabled;
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}
bool scale_updated = state->committed & WLR_OUTPUT_STATE_SCALE;
if (scale_updated) {
output->scale = state->scale;
}
if (state->committed & WLR_OUTPUT_STATE_TRANSFORM) {
output->transform = state->transform;
output_update_matrix(output);
}
bool geometry_updated = state->committed &
(WLR_OUTPUT_STATE_MODE | WLR_OUTPUT_STATE_TRANSFORM |
WLR_OUTPUT_STATE_SUBPIXEL);
// Destroy the swapchains when an output is disabled
if ((state->committed & WLR_OUTPUT_STATE_ENABLED) && !state->enabled) {
wlr_swapchain_destroy(output->swapchain);
output->swapchain = NULL;
wlr_swapchain_destroy(output->cursor_swapchain);
output->cursor_swapchain = NULL;
}
if (state->committed & WLR_OUTPUT_STATE_LAYERS) {
for (size_t i = 0; i < state->layers_len; i++) {
struct wlr_output_layer_state *layer_state = &state->layers[i];
struct wlr_output_layer *layer = layer_state->layer;
// Commit layer ordering
wl_list_remove(&layer->link);
wl_list_insert(output->layers.prev, &layer->link);
// Commit layer state
layer->src_box = layer_state->src_box;
layer->dst_box = layer_state->dst_box;
}
}
if ((state->committed & WLR_OUTPUT_STATE_BUFFER) &&
output->swapchain != NULL) {
wlr_swapchain_set_buffer_submitted(output->swapchain, state->buffer);
}
bool mode_updated = false;
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if (state->committed & WLR_OUTPUT_STATE_MODE) {
int width = 0, height = 0, refresh = 0;
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switch (state->mode_type) {
case WLR_OUTPUT_STATE_MODE_FIXED:;
struct wlr_output_mode *mode = state->mode;
output->current_mode = mode;
if (mode != NULL) {
width = mode->width;
height = mode->height;
refresh = mode->refresh;
}
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break;
case WLR_OUTPUT_STATE_MODE_CUSTOM:
output->current_mode = NULL;
width = state->custom_mode.width;
height = state->custom_mode.height;
refresh = state->custom_mode.refresh;
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break;
}
if (output->width != width || output->height != height ||
output->refresh != refresh) {
output->width = width;
output->height = height;
output_update_matrix(output);
output->refresh = refresh;
if (output->swapchain != NULL &&
(output->swapchain->width != output->width ||
output->swapchain->height != output->height)) {
wlr_swapchain_destroy(output->swapchain);
output->swapchain = NULL;
}
mode_updated = true;
}
}
if (geometry_updated || scale_updated || mode_updated) {
struct wl_resource *resource;
wl_resource_for_each(resource, &output->resources) {
if (mode_updated) {
send_current_mode(resource);
}
if (geometry_updated) {
send_geometry(resource);
}
if (scale_updated) {
send_scale(resource);
}
}
wlr_output_schedule_done(output);
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}
}
void wlr_output_init(struct wlr_output *output, struct wlr_backend *backend,
const struct wlr_output_impl *impl, struct wl_display *display,
const struct wlr_output_state *state) {
assert(impl->commit);
if (impl->set_cursor || impl->move_cursor) {
assert(impl->set_cursor && impl->move_cursor);
}
*output = (struct wlr_output){
.backend = backend,
.impl = impl,
.display = display,
.render_format = DRM_FORMAT_XRGB8888,
.transform = WL_OUTPUT_TRANSFORM_NORMAL,
.scale = 1,
.commit_seq = 0,
};
wl_list_init(&output->modes);
wl_list_init(&output->cursors);
wl_list_init(&output->layers);
wl_list_init(&output->resources);
wl_signal_init(&output->events.frame);
wl_signal_init(&output->events.damage);
wl_signal_init(&output->events.needs_frame);
wl_signal_init(&output->events.precommit);
wl_signal_init(&output->events.commit);
wl_signal_init(&output->events.present);
wl_signal_init(&output->events.bind);
wl_signal_init(&output->events.description);
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wl_signal_init(&output->events.request_state);
wl_signal_init(&output->events.destroy);
wlr_output_state_init(&output->pending);
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output->software_cursor_locks = env_parse_bool("WLR_NO_HARDWARE_CURSORS");
if (output->software_cursor_locks) {
wlr_log(WLR_DEBUG, "WLR_NO_HARDWARE_CURSORS set, forcing software cursors");
}
wlr_addon_set_init(&output->addons);
output->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &output->display_destroy);
if (state) {
output_apply_state(output, state);
}
}
void wlr_output_destroy(struct wlr_output *output) {
if (!output) {
return;
}
wl_list_remove(&output->display_destroy.link);
wlr_output_destroy_global(output);
output_clear_back_buffer(output);
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wl_signal_emit_mutable(&output->events.destroy, output);
wlr_addon_set_finish(&output->addons);
// The backend is responsible for free-ing the list of modes
struct wlr_output_cursor *cursor, *tmp_cursor;
wl_list_for_each_safe(cursor, tmp_cursor, &output->cursors, link) {
wlr_output_cursor_destroy(cursor);
}
struct wlr_output_layer *layer, *tmp_layer;
wl_list_for_each_safe(layer, tmp_layer, &output->layers, link) {
wlr_output_layer_destroy(layer);
}
wlr_swapchain_destroy(output->cursor_swapchain);
wlr_buffer_unlock(output->cursor_front_buffer);
wlr_swapchain_destroy(output->swapchain);
if (output->idle_frame != NULL) {
wl_event_source_remove(output->idle_frame);
}
if (output->idle_done != NULL) {
wl_event_source_remove(output->idle_done);
}
free(output->name);
free(output->description);
free(output->make);
free(output->model);
free(output->serial);
wlr_output_state_finish(&output->pending);
if (output->impl && output->impl->destroy) {
output->impl->destroy(output);
} else {
free(output);
}
}
void wlr_output_transformed_resolution(struct wlr_output *output,
int *width, int *height) {
if (output->transform % 2 == 0) {
*width = output->width;
*height = output->height;
} else {
*width = output->height;
*height = output->width;
}
}
void wlr_output_effective_resolution(struct wlr_output *output,
int *width, int *height) {
wlr_output_transformed_resolution(output, width, height);
*width /= output->scale;
*height /= output->scale;
}
struct wlr_output_mode *wlr_output_preferred_mode(struct wlr_output *output) {
if (wl_list_empty(&output->modes)) {
return NULL;
}
struct wlr_output_mode *mode;
wl_list_for_each(mode, &output->modes, link) {
if (mode->preferred) {
return mode;
}
}
// No preferred mode, choose the first one
return wl_container_of(output->modes.next, mode, link);
}
static void output_state_clear_buffer(struct wlr_output_state *state) {
if (!(state->committed & WLR_OUTPUT_STATE_BUFFER)) {
return;
}
wlr_buffer_unlock(state->buffer);
state->buffer = NULL;
state->committed &= ~WLR_OUTPUT_STATE_BUFFER;
}
void wlr_output_set_damage(struct wlr_output *output,
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const pixman_region32_t *damage) {
pixman_region32_intersect_rect(&output->pending.damage, damage,
0, 0, output->width, output->height);
output->pending.committed |= WLR_OUTPUT_STATE_DAMAGE;
}
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void wlr_output_set_layers(struct wlr_output *output,
struct wlr_output_layer_state *layers, size_t layers_len) {
wlr_output_state_set_layers(&output->pending, layers, layers_len);
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}
static void output_state_clear_gamma_lut(struct wlr_output_state *state) {
free(state->gamma_lut);
state->gamma_lut = NULL;
state->committed &= ~WLR_OUTPUT_STATE_GAMMA_LUT;
}
static void output_state_clear(struct wlr_output_state *state) {
output_state_clear_buffer(state);
output_state_clear_gamma_lut(state);
pixman_region32_clear(&state->damage);
state->committed = 0;
}
void output_pending_resolution(struct wlr_output *output,
const struct wlr_output_state *state, int *width, int *height) {
if (state->committed & WLR_OUTPUT_STATE_MODE) {
switch (state->mode_type) {
case WLR_OUTPUT_STATE_MODE_FIXED:
*width = state->mode->width;
*height = state->mode->height;
return;
case WLR_OUTPUT_STATE_MODE_CUSTOM:
*width = state->custom_mode.width;
*height = state->custom_mode.height;
return;
}
abort();
} else {
*width = output->width;
*height = output->height;
}
}
bool output_pending_enabled(struct wlr_output *output,
const struct wlr_output_state *state) {
if (state->committed & WLR_OUTPUT_STATE_ENABLED) {
return state->enabled;
}
return output->enabled;
}
/**
* Compare a struct wlr_output_state with the current state of a struct
* wlr_output.
*
* Returns a bitfield of the unchanged fields.
*
* Some fields are not checked: damage always changes in-between frames, the
* gamma LUT is too expensive to check, the contents of the buffer might have
* changed, etc.
*/
static uint32_t output_compare_state(struct wlr_output *output,
const struct wlr_output_state *state) {
uint32_t fields = 0;
if (state->committed & WLR_OUTPUT_STATE_MODE) {
bool unchanged = false;
switch (state->mode_type) {
case WLR_OUTPUT_STATE_MODE_FIXED:
unchanged = output->current_mode == state->mode;
break;
case WLR_OUTPUT_STATE_MODE_CUSTOM:
unchanged = output->width == state->custom_mode.width &&
output->height == state->custom_mode.height &&
output->refresh == state->custom_mode.refresh;
break;
}
if (unchanged) {
fields |= WLR_OUTPUT_STATE_MODE;
}
}
if ((state->committed & WLR_OUTPUT_STATE_ENABLED) && output->enabled == state->enabled) {
fields |= WLR_OUTPUT_STATE_ENABLED;
}
if ((state->committed & WLR_OUTPUT_STATE_SCALE) && output->scale == state->scale) {
fields |= WLR_OUTPUT_STATE_SCALE;
}
if ((state->committed & WLR_OUTPUT_STATE_TRANSFORM) &&
output->transform == state->transform) {
fields |= WLR_OUTPUT_STATE_TRANSFORM;
}
if (state->committed & WLR_OUTPUT_STATE_ADAPTIVE_SYNC_ENABLED) {
bool enabled =
output->adaptive_sync_status != WLR_OUTPUT_ADAPTIVE_SYNC_DISABLED;
if (enabled == state->adaptive_sync_enabled) {
fields |= WLR_OUTPUT_STATE_ADAPTIVE_SYNC_ENABLED;
}
}
if ((state->committed & WLR_OUTPUT_STATE_RENDER_FORMAT) &&
output->render_format == state->render_format) {
fields |= WLR_OUTPUT_STATE_RENDER_FORMAT;
}
if ((state->committed & WLR_OUTPUT_STATE_SUBPIXEL) &&
output->subpixel == state->subpixel) {
fields |= WLR_OUTPUT_STATE_SUBPIXEL;
}
return fields;
}
static bool output_basic_test(struct wlr_output *output,
const struct wlr_output_state *state) {
if (state->committed & WLR_OUTPUT_STATE_BUFFER) {
// If the size doesn't match, reject buffer (scaling is not
// supported)
int pending_width, pending_height;
output_pending_resolution(output, state,
&pending_width, &pending_height);
if (state->buffer->width != pending_width ||
state->buffer->height != pending_height) {
wlr_log(WLR_DEBUG, "Primary buffer size mismatch");
return false;
}
} else if (state->tearing_page_flip) {
wlr_log(WLR_ERROR, "Trying to commit a tearing page flip without a buffer?");
return false;
}
if (state->committed & WLR_OUTPUT_STATE_RENDER_FORMAT) {
struct wlr_allocator *allocator = output->allocator;
assert(allocator != NULL);
const struct wlr_drm_format_set *display_formats =
wlr_output_get_primary_formats(output, allocator->buffer_caps);
struct wlr_drm_format format = {0};
if (!output_pick_format(output, display_formats, &format, state->render_format)) {
wlr_log(WLR_ERROR, "Failed to pick primary buffer format for output");
return false;
}
wlr_drm_format_finish(&format);
}
bool enabled = output->enabled;
if (state->committed & WLR_OUTPUT_STATE_ENABLED) {
enabled = state->enabled;
}
if (enabled && (state->committed & (WLR_OUTPUT_STATE_ENABLED |
WLR_OUTPUT_STATE_MODE))) {
int pending_width, pending_height;
output_pending_resolution(output, state,
&pending_width, &pending_height);
if (pending_width == 0 || pending_height == 0) {
wlr_log(WLR_DEBUG, "Tried to enable an output with a zero mode");
return false;
}
}
if (!enabled && state->committed & WLR_OUTPUT_STATE_BUFFER) {
wlr_log(WLR_DEBUG, "Tried to commit a buffer on a disabled output");
return false;
}
if (!enabled && state->committed & WLR_OUTPUT_STATE_MODE) {
wlr_log(WLR_DEBUG, "Tried to modeset a disabled output");
return false;
}
if (!enabled && state->committed & WLR_OUTPUT_STATE_ADAPTIVE_SYNC_ENABLED) {
wlr_log(WLR_DEBUG, "Tried to enable adaptive sync on a disabled output");
return false;
}
if (!enabled && state->committed & WLR_OUTPUT_STATE_RENDER_FORMAT) {
wlr_log(WLR_DEBUG, "Tried to set format for a disabled output");
return false;
}
if (!enabled && state->committed & WLR_OUTPUT_STATE_GAMMA_LUT) {
wlr_log(WLR_DEBUG, "Tried to set the gamma lut on a disabled output");
return false;
}
if (!enabled && state->committed & WLR_OUTPUT_STATE_SUBPIXEL) {
wlr_log(WLR_DEBUG, "Tried to set the subpixel layout on a disabled output");
return false;
}
if (state->committed & WLR_OUTPUT_STATE_LAYERS) {
if (state->layers_len != (size_t)wl_list_length(&output->layers)) {
wlr_log(WLR_DEBUG, "All output layers must be specified in wlr_output_state.layers");
return false;
}
for (size_t i = 0; i < state->layers_len; i++) {
state->layers[i].accepted = false;
}
}
return true;
}
bool wlr_output_test_state(struct wlr_output *output,
const struct wlr_output_state *state) {
uint32_t unchanged = output_compare_state(output, state);
// Create a shallow copy of the state with only the fields which have been
// changed and potentially a new buffer.
struct wlr_output_state copy = *state;
copy.committed &= ~unchanged;
if (!output_basic_test(output, &copy)) {
return false;
}
if (!output->impl->test) {
return true;
}
bool new_back_buffer = false;
if (!output_ensure_buffer(output, &copy, &new_back_buffer)) {
return false;
}
bool success = output->impl->test(output, &copy);
if (new_back_buffer) {
wlr_buffer_unlock(copy.buffer);
}
return success;
}
bool wlr_output_test(struct wlr_output *output) {
struct wlr_output_state state = output->pending;
if (output->back_buffer != NULL) {
assert((state.committed & WLR_OUTPUT_STATE_BUFFER) == 0);
state.committed |= WLR_OUTPUT_STATE_BUFFER;
state.buffer = output->back_buffer;
}
return wlr_output_test_state(output, &state);
}
bool wlr_output_commit_state(struct wlr_output *output,
const struct wlr_output_state *state) {
uint32_t unchanged = output_compare_state(output, state);
// Create a shallow copy of the state with only the fields which have been
// changed and potentially a new buffer.
struct wlr_output_state pending = *state;
pending.committed &= ~unchanged;
if (!output_basic_test(output, &pending)) {
wlr_log(WLR_ERROR, "Basic output test failed for %s", output->name);
return false;
}
bool new_back_buffer = false;
if (!output_ensure_buffer(output, &pending, &new_back_buffer)) {
return false;
}
if ((pending.committed & WLR_OUTPUT_STATE_BUFFER) &&
output->idle_frame != NULL) {
wl_event_source_remove(output->idle_frame);
output->idle_frame = NULL;
}
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
struct wlr_output_event_precommit pre_event = {
.output = output,
.when = &now,
.state = &pending,
};
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wl_signal_emit_mutable(&output->events.precommit, &pre_event);
if (!output->impl->commit(output, &pending)) {
if (new_back_buffer) {
wlr_buffer_unlock(pending.buffer);
}
return false;
}
output->commit_seq++;
if (output_pending_enabled(output, state)) {
output->frame_pending = true;
output->needs_frame = false;
}
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output_apply_state(output, &pending);
struct wlr_output_event_commit event = {
.output = output,
.when = &now,
.state = &pending,
};
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wl_signal_emit_mutable(&output->events.commit, &event);
if (new_back_buffer) {
wlr_buffer_unlock(pending.buffer);
}
return true;
}
bool wlr_output_commit(struct wlr_output *output) {
// Make sure the pending state is cleared before the output is committed
struct wlr_output_state state = {0};
output_state_move(&state, &output->pending);
// output_clear_back_buffer detaches the buffer from the renderer. This is
// important to do before calling impl->commit(), because this marks an
// implicit rendering synchronization point. The backend needs it to avoid
// displaying a buffer when asynchronous GPU work isn't finished.
if (output->back_buffer != NULL) {
wlr_output_state_set_buffer(&state, output->back_buffer);
output_clear_back_buffer(output);
}
bool ok = wlr_output_commit_state(output, &state);
wlr_output_state_finish(&state);
return ok;
}
void wlr_output_rollback(struct wlr_output *output) {
output_clear_back_buffer(output);
output_state_clear(&output->pending);
}
void wlr_output_attach_buffer(struct wlr_output *output,
struct wlr_buffer *buffer) {
wlr_output_state_set_buffer(&output->pending, buffer);
}
void wlr_output_send_frame(struct wlr_output *output) {
output->frame_pending = false;
if (output->enabled) {
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wl_signal_emit_mutable(&output->events.frame, output);
}
}
static void schedule_frame_handle_idle_timer(void *data) {
struct wlr_output *output = data;
output->idle_frame = NULL;
if (!output->frame_pending) {
wlr_output_send_frame(output);
}
}
void wlr_output_schedule_frame(struct wlr_output *output) {
// Make sure the compositor commits a new frame. This is necessary to make
// clients which ask for frame callbacks without submitting a new buffer
// work.
wlr_output_update_needs_frame(output);
if (output->frame_pending || output->idle_frame != NULL) {
return;
}
// We're using an idle timer here in case a buffer swap happens right after
// this function is called
struct wl_event_loop *ev = wl_display_get_event_loop(output->display);
output->idle_frame =
wl_event_loop_add_idle(ev, schedule_frame_handle_idle_timer, output);
}
void wlr_output_send_present(struct wlr_output *output,
struct wlr_output_event_present *event) {
assert(event);
event->output = output;
output: fix stack variable lifetime in wlr_output_send_present Variables on the stack are released when the parent block is closed. Here, `now` is used outside of the `if` block, causing the following crash when starting Sway with the headless backend: ==49606==ERROR: AddressSanitizer: stack-use-after-scope on address 0x7fff94645f90 at pc 0x5558aeae9e29 bp 0x7fff94645df0 sp 0x7fff94645de0 READ of size 16 at 0x7fff94645f90 thread T0 #0 0x5558aeae9e28 in handle_present ../sway/desktop/output.c:834 #1 0x7fdc8d6792fb in wlr_signal_emit_safe ../subprojects/wlroots/util/signal.c:29 #2 0x7fdc8d54f77f in wlr_output_send_present ../subprojects/wlroots/types/output/output.c:766 #3 0x7fdc8d524a28 in output_commit ../subprojects/wlroots/backend/headless/output.c:71 #4 0x7fdc8d54d2db in wlr_output_commit ../subprojects/wlroots/types/output/output.c:629 #5 0x5558aeb013cb in output_render ../sway/desktop/render.c:1157 #6 0x5558aeae549e in output_repaint_timer_handler ../sway/desktop/output.c:544 #7 0x5558aeae5f8a in damage_handle_frame ../sway/desktop/output.c:606 #8 0x7fdc8d6792fb in wlr_signal_emit_safe ../subprojects/wlroots/util/signal.c:29 #9 0x7fdc8d6007d5 in output_handle_frame ../subprojects/wlroots/types/wlr_output_damage.c:44 #10 0x7fdc8d6792fb in wlr_signal_emit_safe ../subprojects/wlroots/util/signal.c:29 #11 0x7fdc8d54ee84 in wlr_output_send_frame ../subprojects/wlroots/types/output/output.c:720 #12 0x7fdc8d54efc3 in schedule_frame_handle_idle_timer ../subprojects/wlroots/types/output/output.c:728 #13 0x7fdc8c9dcf5a in wl_event_loop_dispatch_idle (/usr/lib/libwayland-server.so.0+0xaf5a) #14 0x7fdc8c9dcfb4 in wl_event_loop_dispatch (/usr/lib/libwayland-server.so.0+0xafb4) #15 0x7fdc8c9dabc6 in wl_display_run (/usr/lib/libwayland-server.so.0+0x8bc6) #16 0x5558aeac8e30 in server_run ../sway/server.c:285 #17 0x5558aeac3c7d in main ../sway/main.c:396 #18 0x7fdc8be35b24 in __libc_start_main (/usr/lib/libc.so.6+0x27b24) #19 0x5558aea8686d in _start (/home/simon/src/sway/build/sway/sway+0x33f86d)
2021-10-29 13:31:00 +02:00
struct timespec now;
if (event->presented && event->when == NULL) {
if (clock_gettime(CLOCK_MONOTONIC, &now) != 0) {
wlr_log_errno(WLR_ERROR, "failed to send output present event: "
"failed to read clock");
return;
}
event->when = &now;
}
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wl_signal_emit_mutable(&output->events.present, event);
}
struct deferred_present_event {
struct wlr_output *output;
struct wl_event_source *idle_source;
struct wlr_output_event_present event;
struct wl_listener output_destroy;
};
static void deferred_present_event_destroy(struct deferred_present_event *deferred) {
wl_list_remove(&deferred->output_destroy.link);
free(deferred);
}
static void deferred_present_event_handle_idle(void *data) {
struct deferred_present_event *deferred = data;
wlr_output_send_present(deferred->output, &deferred->event);
deferred_present_event_destroy(deferred);
}
static void deferred_present_event_handle_output_destroy(struct wl_listener *listener, void *data) {
struct deferred_present_event *deferred = wl_container_of(listener, deferred, output_destroy);
wl_event_source_remove(deferred->idle_source);
deferred_present_event_destroy(deferred);
}
void output_defer_present(struct wlr_output *output, struct wlr_output_event_present event) {
struct deferred_present_event *deferred = calloc(1, sizeof(*deferred));
if (!deferred) {
return;
}
*deferred = (struct deferred_present_event){
.output = output,
.event = event,
};
deferred->output_destroy.notify = deferred_present_event_handle_output_destroy;
wl_signal_add(&output->events.destroy, &deferred->output_destroy);
struct wl_event_loop *ev = wl_display_get_event_loop(output->display);
deferred->idle_source = wl_event_loop_add_idle(ev, deferred_present_event_handle_idle, deferred);
}
void wlr_output_send_request_state(struct wlr_output *output,
const struct wlr_output_state *state) {
uint32_t unchanged = output_compare_state(output, state);
struct wlr_output_state copy = *state;
copy.committed &= ~unchanged;
if (copy.committed == 0) {
return;
}
struct wlr_output_event_request_state event = {
.output = output,
.state = &copy,
};
wl_signal_emit_mutable(&output->events.request_state, &event);
}
void wlr_output_set_gamma(struct wlr_output *output, size_t size,
const uint16_t *r, const uint16_t *g, const uint16_t *b) {
wlr_output_state_set_gamma_lut(&output->pending, size, r, g, b);
}
size_t wlr_output_get_gamma_size(struct wlr_output *output) {
if (!output->impl->get_gamma_size) {
return 0;
}
return output->impl->get_gamma_size(output);
}
void wlr_output_update_needs_frame(struct wlr_output *output) {
if (output->needs_frame) {
return;
}
output->needs_frame = true;
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wl_signal_emit_mutable(&output->events.needs_frame, output);
}
const struct wlr_drm_format_set *wlr_output_get_primary_formats(
struct wlr_output *output, uint32_t buffer_caps) {
if (!output->impl->get_primary_formats) {
return NULL;
}
const struct wlr_drm_format_set *formats =
output->impl->get_primary_formats(output, buffer_caps);
if (formats == NULL) {
wlr_log(WLR_ERROR, "Failed to get primary display formats");
static const struct wlr_drm_format_set empty_format_set = {0};
return &empty_format_set;
}
return formats;
}
bool wlr_output_is_direct_scanout_allowed(struct wlr_output *output) {
if (output->attach_render_locks > 0) {
wlr_log(WLR_DEBUG, "Direct scan-out disabled by lock");
return false;
}
// If the output has at least one software cursor, reject direct scan-out
struct wlr_output_cursor *cursor;
wl_list_for_each(cursor, &output->cursors, link) {
if (cursor->enabled && cursor->visible &&
cursor != output->hardware_cursor) {
wlr_log(WLR_DEBUG,
"Direct scan-out disabled by software cursor");
return false;
}
}
return true;
}