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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "components/exo/wayland/wayland_keyboard_delegate.h"
#include <wayland-server-core.h>
#include <wayland-server-protocol-core.h>
#include <cstring>
#include <string_view>
#include "base/containers/flat_map.h"
#include "base/memory/unsafe_shared_memory_region.h"
#include "base/numerics/safe_conversions.h"
#include "components/exo/wayland/serial_tracker.h"
#include "ui/events/keycodes/dom/dom_code.h"
#include "ui/events/keycodes/dom/keycode_converter.h"
#if BUILDFLAG(USE_XKBCOMMON)
#include <xkbcommon/xkbcommon.h>
#endif
namespace exo {
namespace wayland {
#if BUILDFLAG(USE_XKBCOMMON)
WaylandKeyboardDelegate::WaylandKeyboardDelegate(wl_resource* keyboard_resource,
SerialTracker* serial_tracker)
: keyboard_resource_(keyboard_resource), serial_tracker_(serial_tracker) {}
WaylandKeyboardDelegate::~WaylandKeyboardDelegate() = default;
bool WaylandKeyboardDelegate::CanAcceptKeyboardEventsForSurface(
Surface* surface) const {
wl_resource* surface_resource = GetSurfaceResource(surface);
// We can accept events for this surface if the client is the same as the
// keyboard.
return surface_resource &&
wl_resource_get_client(surface_resource) == client();
}
void WaylandKeyboardDelegate::OnKeyboardEnter(
Surface* surface,
const base::flat_map<PhysicalCode, base::flat_set<KeyState>>&
pressed_keys) {
wl_resource* surface_resource = GetSurfaceResource(surface);
DCHECK(surface_resource);
wl_array keys;
wl_array_init(&keys);
for (const auto& entry : pressed_keys) {
for (const auto& key_state : entry.second) {
uint32_t* value =
static_cast<uint32_t*>(wl_array_add(&keys, sizeof(uint32_t)));
DCHECK(value);
*value = ui::KeycodeConverter::DomCodeToEvdevCode(key_state.code);
}
}
wl_keyboard_send_enter(
keyboard_resource_,
serial_tracker_->GetNextSerial(SerialTracker::EventType::OTHER_EVENT),
surface_resource, &keys);
wl_array_release(&keys);
wl_client_flush(client());
}
void WaylandKeyboardDelegate::OnKeyboardLeave(Surface* surface) {
wl_resource* surface_resource = GetSurfaceResource(surface);
DCHECK(surface_resource);
wl_keyboard_send_leave(
keyboard_resource_,
serial_tracker_->GetNextSerial(SerialTracker::EventType::OTHER_EVENT),
surface_resource);
wl_client_flush(client());
}
uint32_t WaylandKeyboardDelegate::OnKeyboardKey(base::TimeTicks time_stamp,
ui::DomCode code,
bool pressed) {
uint32_t serial = serial_tracker_->MaybeNextKeySerial();
serial_tracker_->ResetKeySerial();
SendTimestamp(time_stamp);
wl_keyboard_send_key(
keyboard_resource_, serial, TimeTicksToMilliseconds(time_stamp),
ui::KeycodeConverter::DomCodeToEvdevCode(code),
pressed ? WL_KEYBOARD_KEY_STATE_PRESSED : WL_KEYBOARD_KEY_STATE_RELEASED);
// Unlike normal wayland clients, the X11 server tries to maintain its own
// modifier state, which it updates based on key events. To prevent numlock
// presses from allowing numpad keys to be interpreted as directions, we
// re-send the modifier state after a numlock press.
if (code == ui::DomCode::NUM_LOCK)
SendKeyboardModifiers();
wl_client_flush(client());
return serial;
}
void WaylandKeyboardDelegate::OnKeyboardModifiers(
const KeyboardModifiers& modifiers) {
// Send the update only when they're different.
if (current_modifiers_ == modifiers)
return;
current_modifiers_ = modifiers;
SendKeyboardModifiers();
}
void WaylandKeyboardDelegate::OnKeyboardLayoutUpdated(std::string_view keymap) {
// Sent the content of |keymap| with trailing '\0' termination via shared
// memory.
base::UnsafeSharedMemoryRegion shared_keymap_region =
base::UnsafeSharedMemoryRegion::Create(keymap.size() + 1);
base::WritableSharedMemoryMapping shared_keymap = shared_keymap_region.Map();
base::subtle::PlatformSharedMemoryRegion platform_shared_keymap =
base::UnsafeSharedMemoryRegion::TakeHandleForSerialization(
std::move(shared_keymap_region));
DCHECK(shared_keymap.IsValid());
std::memcpy(shared_keymap.memory(), keymap.data(), keymap.size());
static_cast<uint8_t*>(shared_keymap.memory())[keymap.size()] = '\0';
wl_keyboard_send_keymap(keyboard_resource_, WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1,
platform_shared_keymap.GetPlatformHandle().fd,
keymap.size() + 1);
wl_client_flush(client());
}
void WaylandKeyboardDelegate::SendKeyboardModifiers() {
wl_keyboard_send_modifiers(
keyboard_resource_,
serial_tracker_->GetNextSerial(SerialTracker::EventType::OTHER_EVENT),
current_modifiers_.depressed, current_modifiers_.locked,
current_modifiers_.latched, current_modifiers_.group);
wl_client_flush(client());
}
// Convert from ChromeOS's key repeat interval to Wayland's key repeat rate.
// For example, an interval of 500ms is a rate of 1000/500 = 2 Hz.
//
// Known issue: A 2000ms interval is 0.5 Hz. This rounds to 1 Hz, which
// is twice as fast. This is not fixable without Wayland spec changes.
int32_t GetWaylandRepeatRate(bool enabled, base::TimeDelta interval) {
DCHECK(interval.InMillisecondsF() > 0.0);
int32_t rate;
if (enabled) {
// Most of ChromeOS's interval options divide perfectly into 1000,
// but a few do need rounding.
rate = base::ClampRound<int32_t>(interval.ToHz());
// Avoid disabling key repeat if the interval is >2000ms.
rate = std::max(1, rate);
} else {
// Disables key repeat, as documented in Wayland spec.
rate = 0;
}
return rate;
}
// Expose GetWaylandRepeatRate() to tests.
int32_t GetWaylandRepeatRateForTesting(bool enabled, base::TimeDelta interval) {
return GetWaylandRepeatRate(enabled, interval);
}
void WaylandKeyboardDelegate::OnKeyRepeatSettingsChanged(
bool enabled,
base::TimeDelta delay,
base::TimeDelta interval) {
// delay may be zero, but not negative (per Wayland spec).
DCHECK_GE(delay.InMilliseconds(), 0);
uint32_t version = wl_resource_get_version(keyboard_resource_);
if (version >= WL_KEYBOARD_REPEAT_INFO_SINCE_VERSION) {
wl_keyboard_send_repeat_info(keyboard_resource_,
GetWaylandRepeatRate(enabled, interval),
static_cast<int32_t>(delay.InMilliseconds()));
wl_client_flush(client());
}
}
wl_client* WaylandKeyboardDelegate::client() const {
return wl_resource_get_client(keyboard_resource_);
}
#endif // BUILDFLAG(USE_XKBCOMMON)
} // namespace wayland
} // namespace exo
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