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https://github.com/RGBCube/serenity
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fdae117600
Some devices may require DMA transfers to flush the updated buffer areas prior to flipping. For those devices we track the areas that require flushing prior to the next flip. For devices that do not support flipping, but require flushing, we'll simply flush after updating the front buffer. This also adds a small optimization that skips these steps entirely for a screen that doesn't have any updates that need to be rendered.
394 lines
14 KiB
C++
394 lines
14 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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NonnullOwnPtrVector<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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auto screens_backup = move(s_screens);
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auto layout_backup = move(s_layout);
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for (auto& old_screen : screens_backup)
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old_screen.close_device();
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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 (auto& old_screen : screens_backup) {
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if (!old_screen.open_device()) {
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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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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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auto* screen = WindowServer::Screen::create(s_layout.screens[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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if (s_layout.main_screen_index == index)
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screen->make_main_screen();
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screen->open_device();
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}
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rollback.disarm();
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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(ScreenLayout::Screen& screen_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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, m_framebuffer_data(adopt_own(*new ScreenFBData()))
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, m_info(screen_info)
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{
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open_device();
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// If the cursor is not in a valid screen (yet), force it into one
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dbgln("Screen() current physical cursor location: {} rect: {}", ScreenInput::the().cursor_location(), rect());
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if (!find_by_location(ScreenInput::the().cursor_location()))
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ScreenInput::the().set_cursor_location(rect().center());
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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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m_framebuffer_fd = open(m_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 {}", m_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::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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FBResolution physical_resolution { 0, (unsigned)m_info.resolution.width(), (unsigned)m_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)m_info.resolution.width() || physical_resolution.height != (unsigned)m_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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}
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m_info.resolution = { physical_resolution.width, physical_resolution.height };
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m_pitch = physical_resolution.pitch;
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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(), m_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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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::queue_flush_display_rect(Gfx::IntRect const& flush_region)
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{
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// NOTE: we don't scale until in Screen::flush_display so that when
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// there are too many rectangles that we end up throwing away, we didn't
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// waste accounting for scale factor!
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auto& fb_data = *m_framebuffer_data;
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if (fb_data.too_many_pending_flush_rects) {
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// We already have too many, just make sure we extend it if needed
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VERIFY(!fb_data.pending_flush_rects.is_empty());
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if (fb_data.pending_flush_rects.size() == 1) {
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auto& union_rect = fb_data.pending_flush_rects[0];
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auto new_union = flush_region.united(Gfx::IntRect((int)union_rect.x, (int)union_rect.y, (int)union_rect.width, (int)union_rect.height));
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union_rect.x = new_union.left();
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union_rect.y = new_union.top();
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union_rect.width = new_union.width();
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union_rect.height = new_union.height();
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} else {
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// Convert all the rectangles into one union
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auto new_union = flush_region;
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for (auto& flush_rect : fb_data.pending_flush_rects)
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new_union = new_union.united(Gfx::IntRect((int)flush_rect.x, (int)flush_rect.y, (int)flush_rect.width, (int)flush_rect.height));
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fb_data.pending_flush_rects.resize(1, true);
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auto& union_rect = fb_data.pending_flush_rects[0];
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union_rect.x = new_union.left();
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union_rect.y = new_union.top();
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union_rect.width = new_union.width();
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union_rect.height = new_union.height();
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}
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return;
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}
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VERIFY(fb_data.pending_flush_rects.size() < fb_data.pending_flush_rects.capacity());
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fb_data.pending_flush_rects.append({ (unsigned)flush_region.left(),
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(unsigned)flush_region.top(),
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(unsigned)flush_region.width(),
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(unsigned)flush_region.height() });
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if (fb_data.pending_flush_rects.size() == fb_data.pending_flush_rects.capacity()) {
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// If we get one more rectangle then we need to convert it to a single union rectangle
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fb_data.too_many_pending_flush_rects = true;
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}
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}
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void Screen::flush_display(int buffer_index)
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{
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VERIFY(m_can_device_flush_buffers);
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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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// Now that we have a final set of rects, apply the scale factor
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auto scale_factor = this->scale_factor();
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for (auto& flush_rect : fb_data.pending_flush_rects) {
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flush_rect.x *= scale_factor;
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flush_rect.y *= scale_factor;
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flush_rect.width *= scale_factor;
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flush_rect.height *= scale_factor;
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}
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if (fb_flush_buffers(m_framebuffer_fd, buffer_index, fb_data.pending_flush_rects.data(), (unsigned)fb_data.pending_flush_rects.size()) < 0) {
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int err = errno;
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if (err == ENOTSUP)
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m_can_device_flush_buffers = false;
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else
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dbgln("Screen #{}: Error ({}) flushing display: {}", index(), err, strerror(err));
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}
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fb_data.too_many_pending_flush_rects = false;
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fb_data.pending_flush_rects.clear_with_capacity();
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}
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}
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