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https://github.com/LadybirdBrowser/ladybird.git
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dbb9f891fb
If a screen layout cannot be applied, instead of failing to start WindowServer try to fall back to an auto-generated screen layout with the devices that are detected. Also, be a bit smarter about changing the current screen layout. Instead of closing all framebuffers and bringing them back up, keep what we can and only change resolution on those that we need to change them on. To make this work we also need to move away from using an array of structures to hold compositor related per-screen data to attaching it to the Screen itself, which makes re-using a screen much simpler.
580 lines
21 KiB
C++
580 lines
21 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Screen.h"
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#include "Compositor.h"
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#include "Event.h"
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#include "EventLoop.h"
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#include "WindowManager.h"
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#include <AK/Debug.h>
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#include <Kernel/API/FB.h>
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#include <Kernel/API/MousePacket.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <unistd.h>
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namespace WindowServer {
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NonnullRefPtrVector<Screen, default_screen_count> Screen::s_screens;
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Screen* Screen::s_main_screen { nullptr };
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Gfx::IntRect Screen::s_bounding_screens_rect {};
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ScreenLayout Screen::s_layout;
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Vector<int, default_scale_factors_in_use_count> Screen::s_scale_factors_in_use;
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struct ScreenFBData {
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Vector<FBRect, 32> pending_flush_rects;
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bool too_many_pending_flush_rects { false };
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};
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ScreenInput& ScreenInput::the()
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{
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static ScreenInput s_the;
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return s_the;
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}
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Screen& ScreenInput::cursor_location_screen()
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{
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auto* screen = Screen::find_by_location(m_cursor_location);
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VERIFY(screen);
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return *screen;
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}
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const Screen& ScreenInput::cursor_location_screen() const
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{
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auto* screen = Screen::find_by_location(m_cursor_location);
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VERIFY(screen);
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return *screen;
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}
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bool Screen::apply_layout(ScreenLayout&& screen_layout, String& error_msg)
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{
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if (!screen_layout.is_valid(&error_msg))
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return false;
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if (screen_layout == s_layout)
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return true;
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bool place_cursor_on_main_screen = find_by_location(ScreenInput::the().cursor_location()) == nullptr;
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HashMap<size_t, size_t> current_to_new_indices_map;
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HashMap<size_t, size_t> new_to_current_indices_map;
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HashMap<size_t, NonnullRefPtr<Screen>> devices_no_longer_used;
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for (size_t i = 0; i < s_layout.screens.size(); i++) {
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auto& screen = s_layout.screens[i];
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bool found = false;
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for (size_t j = 0; j < screen_layout.screens.size(); j++) {
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auto& new_screen = screen_layout.screens[j];
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if (new_screen.device == screen.device) {
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current_to_new_indices_map.set(i, j);
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new_to_current_indices_map.set(j, i);
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found = true;
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break;
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}
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}
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if (!found)
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devices_no_longer_used.set(i, s_screens[i]);
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}
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HashMap<Screen*, size_t> screens_with_resolution_change;
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HashMap<Screen*, size_t> screens_with_scale_change;
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for (auto& it : current_to_new_indices_map) {
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auto& screen = s_layout.screens[it.key];
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auto& new_screen = screen_layout.screens[it.value];
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if (screen.resolution != new_screen.resolution)
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screens_with_resolution_change.set(&s_screens[it.key], it.value);
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if (screen.scale_factor != new_screen.scale_factor)
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screens_with_scale_change.set(&s_screens[it.key], it.value);
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}
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auto screens_backup = move(s_screens);
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auto layout_backup = move(s_layout);
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for (auto& it : screens_with_resolution_change) {
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auto& existing_screen = *it.key;
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dbgln("Closing device {} in preparation for resolution change", layout_backup.screens[existing_screen.index()].device);
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existing_screen.close_device();
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}
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AK::ArmedScopeGuard rollback([&] {
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for (auto& screen : s_screens)
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screen.close_device();
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s_screens = move(screens_backup);
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s_layout = move(layout_backup);
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for (size_t i = 0; i < s_screens.size(); i++) {
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auto& old_screen = s_screens[i];
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// Restore the original screen index in case it changed
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old_screen.set_index(i);
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if (i == s_layout.main_screen_index)
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old_screen.make_main_screen();
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bool changed_scale = screens_with_scale_change.contains(&old_screen);
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if (screens_with_resolution_change.contains(&old_screen)) {
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if (old_screen.open_device()) {
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// The resolution was changed, so we also implicitly applied the new scale factor
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changed_scale = false;
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} else {
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// Don't set error_msg here, it should already be set
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dbgln("Rolling back screen layout failed: could not open device");
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}
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}
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old_screen.update_virtual_rect();
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if (changed_scale)
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old_screen.scale_factor_changed();
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}
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update_bounding_rect();
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});
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s_layout = move(screen_layout);
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for (size_t index = 0; index < s_layout.screens.size(); index++) {
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Screen* screen;
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bool need_to_open_device;
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if (auto it = new_to_current_indices_map.find(index); it != new_to_current_indices_map.end()) {
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// Re-use the existing screen instance
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screen = &screens_backup[it->value];
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s_screens.append(*screen);
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screen->set_index(index);
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need_to_open_device = screens_with_resolution_change.contains(screen);
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} else {
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screen = WindowServer::Screen::create(index);
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if (!screen) {
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error_msg = String::formatted("Error creating screen #{}", index);
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return false;
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}
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need_to_open_device = true;
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}
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if (need_to_open_device && !screen->open_device()) {
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error_msg = String::formatted("Error opening device for screen #{}", index);
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return false;
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}
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screen->update_virtual_rect();
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if (!need_to_open_device && screens_with_scale_change.contains(screen))
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screen->scale_factor_changed();
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VERIFY(screen);
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VERIFY(index == screen->index());
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if (s_layout.main_screen_index == index)
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screen->make_main_screen();
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}
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rollback.disarm();
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if (place_cursor_on_main_screen) {
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ScreenInput::the().set_cursor_location(Screen::main().rect().center());
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} else {
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auto cursor_location = ScreenInput::the().cursor_location();
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if (!find_by_location(cursor_location)) {
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// Cursor is off screen, try to find the closest location on another screen
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float closest_distance = 0;
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Optional<Gfx::IntPoint> closest_point;
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for (auto& screen : s_screens) {
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auto closest_point_on_screen_rect = screen.rect().closest_to(cursor_location);
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auto distance = closest_point_on_screen_rect.distance_from(cursor_location);
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if (!closest_point.has_value() || distance < closest_distance) {
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closest_distance = distance;
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closest_point = closest_point_on_screen_rect;
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}
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}
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ScreenInput::the().set_cursor_location(closest_point.value()); // We should always have one
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}
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}
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update_bounding_rect();
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update_scale_factors_in_use();
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return true;
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}
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void Screen::update_scale_factors_in_use()
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{
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s_scale_factors_in_use.clear();
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for_each([&](auto& screen) {
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auto scale_factor = screen.scale_factor();
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// The This doesn't have to be extremely efficient as this
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// code is only run when we start up or the screen configuration
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// changes. But using a vector allows for efficient iteration,
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// which is the most common use case.
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if (!s_scale_factors_in_use.contains_slow(scale_factor))
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s_scale_factors_in_use.append(scale_factor);
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return IterationDecision::Continue;
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});
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}
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Screen::Screen(size_t screen_index)
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: m_index(screen_index)
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, m_framebuffer_data(adopt_own(*new ScreenFBData()))
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, m_compositor_screen_data(Compositor::create_screen_data({}))
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{
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update_virtual_rect();
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open_device();
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}
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Screen::~Screen()
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{
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close_device();
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}
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bool Screen::open_device()
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{
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close_device();
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auto& info = screen_layout_info();
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m_framebuffer_fd = open(info.device.characters(), O_RDWR | O_CLOEXEC);
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if (m_framebuffer_fd < 0) {
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perror(String::formatted("failed to open {}", info.device).characters());
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return false;
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}
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m_can_set_buffer = (fb_set_buffer(m_framebuffer_fd, 0) == 0);
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m_can_device_flush_buffers = true; // If the device can't do it we revert to false
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set_resolution(true);
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return true;
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}
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void Screen::close_device()
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{
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if (m_framebuffer_fd >= 0) {
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close(m_framebuffer_fd);
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m_framebuffer_fd = -1;
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}
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if (m_framebuffer) {
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int rc = munmap(m_framebuffer, m_size_in_bytes);
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VERIFY(rc == 0);
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m_framebuffer = nullptr;
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m_size_in_bytes = 0;
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}
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}
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void Screen::update_virtual_rect()
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{
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auto& screen_info = screen_layout_info();
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m_virtual_rect = { screen_info.location, { screen_info.resolution.width() / screen_info.scale_factor, screen_info.resolution.height() / screen_info.scale_factor } };
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dbgln("update_virtual_rect for screen #{}: {}", index(), m_virtual_rect);
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}
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void Screen::scale_factor_changed()
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{
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// Flush rects are affected by the screen factor
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constrain_pending_flush_rects();
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}
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void Screen::init()
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{
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set_resolution(true);
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}
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Screen& Screen::closest_to_rect(const Gfx::IntRect& rect)
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{
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Screen* best_screen = nullptr;
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int best_area = 0;
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for (auto& screen : s_screens) {
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auto r = screen.rect().intersected(rect);
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int area = r.width() * r.height();
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if (!best_screen || area > best_area) {
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best_screen = &screen;
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best_area = area;
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}
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}
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if (!best_screen) {
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// TODO: try to find the best screen in close proximity
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best_screen = &Screen::main();
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}
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return *best_screen;
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}
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Screen& Screen::closest_to_location(const Gfx::IntPoint& point)
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{
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for (auto& screen : s_screens) {
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if (screen.rect().contains(point))
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return screen;
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}
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// TODO: guess based on how close the point is to the next screen rectangle
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return Screen::main();
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}
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void Screen::update_bounding_rect()
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{
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if (!s_screens.is_empty()) {
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s_bounding_screens_rect = s_screens[0].rect();
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for (size_t i = 1; i < s_screens.size(); i++)
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s_bounding_screens_rect = s_bounding_screens_rect.united(s_screens[i].rect());
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} else {
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s_bounding_screens_rect = {};
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}
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}
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bool Screen::set_resolution(bool initial)
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{
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// Remember the screen that the cursor is on. Make sure it stays on the same screen if we change its resolution...
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Screen* screen_with_cursor = nullptr;
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if (!initial)
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screen_with_cursor = &ScreenInput::the().cursor_location_screen();
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auto& info = screen_layout_info();
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FBResolution physical_resolution { 0, (unsigned)info.resolution.width(), (unsigned)info.resolution.height() };
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int rc = fb_set_resolution(m_framebuffer_fd, &physical_resolution);
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dbgln_if(WSSCREEN_DEBUG, "Screen #{}: fb_set_resolution() - return code {}", index(), rc);
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auto on_change_resolution = [&]() {
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if (initial || physical_resolution.width != (unsigned)info.resolution.width() || physical_resolution.height != (unsigned)info.resolution.height()) {
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if (m_framebuffer) {
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size_t previous_size_in_bytes = m_size_in_bytes;
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int rc = munmap(m_framebuffer, previous_size_in_bytes);
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VERIFY(rc == 0);
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}
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int rc = fb_get_size_in_bytes(m_framebuffer_fd, &m_size_in_bytes);
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VERIFY(rc == 0);
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m_framebuffer = (Gfx::RGBA32*)mmap(nullptr, m_size_in_bytes, PROT_READ | PROT_WRITE, MAP_SHARED, m_framebuffer_fd, 0);
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VERIFY(m_framebuffer && m_framebuffer != (void*)-1);
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if (m_can_set_buffer) {
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unsigned buffer_offset = 0;
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rc = fb_get_buffer_offset(m_framebuffer_fd, 1, &buffer_offset);
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if (rc == 0) {
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m_back_buffer_offset = buffer_offset;
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} else {
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// fall back to assuming the second buffer starts right after the last line of the first
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m_back_buffer_offset = physical_resolution.pitch * physical_resolution.height;
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}
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} else {
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m_back_buffer_offset = 0;
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}
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}
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info.resolution = { physical_resolution.width, physical_resolution.height };
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m_pitch = physical_resolution.pitch;
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update_virtual_rect();
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// Since pending flush rects are affected by the scale factor
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// update even if only the scale factor changed
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constrain_pending_flush_rects();
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if (this == screen_with_cursor) {
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auto& screen_input = ScreenInput::the();
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screen_input.set_cursor_location(screen_input.cursor_location().constrained(rect()));
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}
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};
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if (rc == 0) {
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on_change_resolution();
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return true;
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}
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if (rc == -1) {
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int err = errno;
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dbgln("Screen #{}: Failed to set resolution {}: {}", index(), info.resolution, strerror(err));
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on_change_resolution();
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return false;
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}
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VERIFY_NOT_REACHED();
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}
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void Screen::set_buffer(int index)
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{
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VERIFY(m_can_set_buffer);
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int rc = fb_set_buffer(m_framebuffer_fd, index);
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VERIFY(rc == 0);
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}
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size_t Screen::buffer_offset(int index) const
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{
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if (index == 0)
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return 0;
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if (index == 1)
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return m_back_buffer_offset;
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VERIFY_NOT_REACHED();
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}
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void ScreenInput::set_acceleration_factor(double factor)
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{
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VERIFY(factor >= mouse_accel_min && factor <= mouse_accel_max);
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m_acceleration_factor = factor;
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}
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void ScreenInput::set_scroll_step_size(unsigned step_size)
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{
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VERIFY(step_size >= scroll_step_size_min);
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m_scroll_step_size = step_size;
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}
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void ScreenInput::on_receive_mouse_data(const MousePacket& packet)
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{
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auto& current_screen = cursor_location_screen();
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auto prev_location = m_cursor_location;
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if (packet.is_relative) {
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m_cursor_location.translate_by(packet.x * m_acceleration_factor, packet.y * m_acceleration_factor);
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dbgln_if(WSSCREEN_DEBUG, "Screen: New Relative mouse point @ {}", m_cursor_location);
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} else {
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m_cursor_location = { packet.x * current_screen.width() / 0xffff, packet.y * current_screen.height() / 0xffff };
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dbgln_if(WSSCREEN_DEBUG, "Screen: New Absolute mouse point @ {}", m_cursor_location);
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}
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auto* moved_to_screen = Screen::find_by_location(m_cursor_location);
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if (!moved_to_screen) {
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m_cursor_location = m_cursor_location.constrained(current_screen.rect());
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moved_to_screen = ¤t_screen;
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}
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unsigned buttons = packet.buttons;
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unsigned prev_buttons = m_mouse_button_state;
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m_mouse_button_state = buttons;
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unsigned changed_buttons = prev_buttons ^ buttons;
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auto post_mousedown_or_mouseup_if_needed = [&](MouseButton button) {
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if (!(changed_buttons & (unsigned)button))
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return;
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auto message = make<MouseEvent>(buttons & (unsigned)button ? Event::MouseDown : Event::MouseUp, m_cursor_location, buttons, button, m_modifiers);
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Core::EventLoop::current().post_event(WindowManager::the(), move(message));
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};
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post_mousedown_or_mouseup_if_needed(MouseButton::Left);
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post_mousedown_or_mouseup_if_needed(MouseButton::Right);
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post_mousedown_or_mouseup_if_needed(MouseButton::Middle);
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post_mousedown_or_mouseup_if_needed(MouseButton::Back);
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post_mousedown_or_mouseup_if_needed(MouseButton::Forward);
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if (m_cursor_location != prev_location) {
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auto message = make<MouseEvent>(Event::MouseMove, m_cursor_location, buttons, MouseButton::None, m_modifiers);
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if (WindowManager::the().dnd_client())
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message->set_mime_data(WindowManager::the().dnd_mime_data());
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Core::EventLoop::current().post_event(WindowManager::the(), move(message));
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}
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if (packet.z) {
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auto message = make<MouseEvent>(Event::MouseWheel, m_cursor_location, buttons, MouseButton::None, m_modifiers, packet.z * m_scroll_step_size);
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Core::EventLoop::current().post_event(WindowManager::the(), move(message));
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}
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if (m_cursor_location != prev_location)
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Compositor::the().invalidate_cursor();
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}
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void ScreenInput::on_receive_keyboard_data(::KeyEvent kernel_event)
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{
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m_modifiers = kernel_event.modifiers();
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auto message = make<KeyEvent>(kernel_event.is_press() ? Event::KeyDown : Event::KeyUp, kernel_event.key, kernel_event.code_point, kernel_event.modifiers(), kernel_event.scancode);
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Core::EventLoop::current().post_event(WindowManager::the(), move(message));
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}
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void Screen::constrain_pending_flush_rects()
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{
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auto& fb_data = *m_framebuffer_data;
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if (fb_data.pending_flush_rects.is_empty())
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return;
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Gfx::IntRect screen_rect({}, rect().size());
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Gfx::DisjointRectSet rects;
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for (auto& fb_rect : fb_data.pending_flush_rects) {
|
|
Gfx::IntRect rect { (int)fb_rect.x, (int)fb_rect.y, (int)fb_rect.width, (int)fb_rect.height };
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auto intersected_rect = rect.intersected(screen_rect);
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|
if (!intersected_rect.is_empty())
|
|
rects.add(intersected_rect);
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|
}
|
|
fb_data.pending_flush_rects.clear_with_capacity();
|
|
for (auto& rect : rects.rects()) {
|
|
fb_data.pending_flush_rects.append({
|
|
x : (unsigned)rect.x(),
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|
y : (unsigned)rect.y(),
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|
width : (unsigned)rect.width(),
|
|
height : (unsigned)rect.height()
|
|
});
|
|
}
|
|
}
|
|
|
|
void Screen::queue_flush_display_rect(Gfx::IntRect const& flush_region)
|
|
{
|
|
// NOTE: we don't scale until in Screen::flush_display so that when
|
|
// there are too many rectangles that we end up throwing away, we didn't
|
|
// waste accounting for scale factor!
|
|
auto& fb_data = *m_framebuffer_data;
|
|
if (fb_data.too_many_pending_flush_rects) {
|
|
// We already have too many, just make sure we extend it if needed
|
|
VERIFY(!fb_data.pending_flush_rects.is_empty());
|
|
if (fb_data.pending_flush_rects.size() == 1) {
|
|
auto& union_rect = fb_data.pending_flush_rects[0];
|
|
auto new_union = flush_region.united(Gfx::IntRect((int)union_rect.x, (int)union_rect.y, (int)union_rect.width, (int)union_rect.height));
|
|
union_rect.x = new_union.left();
|
|
union_rect.y = new_union.top();
|
|
union_rect.width = new_union.width();
|
|
union_rect.height = new_union.height();
|
|
} else {
|
|
// Convert all the rectangles into one union
|
|
auto new_union = flush_region;
|
|
for (auto& flush_rect : fb_data.pending_flush_rects)
|
|
new_union = new_union.united(Gfx::IntRect((int)flush_rect.x, (int)flush_rect.y, (int)flush_rect.width, (int)flush_rect.height));
|
|
fb_data.pending_flush_rects.resize(1, true);
|
|
auto& union_rect = fb_data.pending_flush_rects[0];
|
|
union_rect.x = new_union.left();
|
|
union_rect.y = new_union.top();
|
|
union_rect.width = new_union.width();
|
|
union_rect.height = new_union.height();
|
|
}
|
|
return;
|
|
}
|
|
VERIFY(fb_data.pending_flush_rects.size() < fb_data.pending_flush_rects.capacity());
|
|
fb_data.pending_flush_rects.append({ (unsigned)flush_region.left(),
|
|
(unsigned)flush_region.top(),
|
|
(unsigned)flush_region.width(),
|
|
(unsigned)flush_region.height() });
|
|
if (fb_data.pending_flush_rects.size() == fb_data.pending_flush_rects.capacity()) {
|
|
// If we get one more rectangle then we need to convert it to a single union rectangle
|
|
fb_data.too_many_pending_flush_rects = true;
|
|
}
|
|
}
|
|
|
|
void Screen::flush_display(int buffer_index)
|
|
{
|
|
VERIFY(m_can_device_flush_buffers);
|
|
auto& fb_data = *m_framebuffer_data;
|
|
if (fb_data.pending_flush_rects.is_empty())
|
|
return;
|
|
|
|
// Now that we have a final set of rects, apply the scale factor
|
|
auto scale_factor = this->scale_factor();
|
|
for (auto& flush_rect : fb_data.pending_flush_rects) {
|
|
VERIFY(Gfx::IntRect({}, m_virtual_rect.size()).contains({ (int)flush_rect.x, (int)flush_rect.y, (int)flush_rect.width, (int)flush_rect.height }));
|
|
flush_rect.x *= scale_factor;
|
|
flush_rect.y *= scale_factor;
|
|
flush_rect.width *= scale_factor;
|
|
flush_rect.height *= scale_factor;
|
|
}
|
|
|
|
if (fb_flush_buffers(m_framebuffer_fd, buffer_index, fb_data.pending_flush_rects.data(), (unsigned)fb_data.pending_flush_rects.size()) < 0) {
|
|
int err = errno;
|
|
if (err == ENOTSUP)
|
|
m_can_device_flush_buffers = false;
|
|
else
|
|
dbgln("Screen #{}: Error ({}) flushing display: {}", index(), err, strerror(err));
|
|
}
|
|
|
|
fb_data.too_many_pending_flush_rects = false;
|
|
fb_data.pending_flush_rects.clear_with_capacity();
|
|
}
|
|
|
|
void Screen::flush_display_front_buffer(int front_buffer_index, Gfx::IntRect& rect)
|
|
{
|
|
VERIFY(m_can_device_flush_buffers);
|
|
auto scale_factor = this->scale_factor();
|
|
FBRect flush_rect {
|
|
.x = (unsigned)(rect.x() * scale_factor),
|
|
.y = (unsigned)(rect.y() * scale_factor),
|
|
.width = (unsigned)(rect.width() * scale_factor),
|
|
.height = (unsigned)(rect.height() * scale_factor)
|
|
};
|
|
|
|
VERIFY(Gfx::IntRect({}, m_virtual_rect.size()).contains(rect));
|
|
if (fb_flush_buffers(m_framebuffer_fd, front_buffer_index, &flush_rect, 1) < 0) {
|
|
int err = errno;
|
|
if (err == ENOTSUP)
|
|
m_can_device_flush_buffers = false;
|
|
else
|
|
dbgln("Screen #{}: Error ({}) flushing display front buffer: {}", index(), err, strerror(err));
|
|
}
|
|
}
|
|
|
|
}
|