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ladybird/Services/WindowServer/Compositor.cpp
Tom a698a58d3c WindowServer: Fix flickering 
Rather than blitting and rendering each window every time, only
render what actually changed. And while doing so, only render
the portions that are visible on the screen. This avoids flickering
because flipping framebuffers isn't always perfectly in sync with
the code, so it's possible that the flip happens slightly delayed
and we can briefly see the next iteration having partially completed.

Also, avoid touching the mouse cursor unless it is in an area that
needs updating. This reduces flickering unless it is over an area
that is updated often. And because we no longer render the entire
screen, we'll save the contents below the cursor so that we can
hide it before touching that area.

Fixes #2981
2020-08-18 12:12:27 +02:00

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Compositor.h"
#include "ClientConnection.h"
#include "Event.h"
#include "EventLoop.h"
#include "Screen.h"
#include "Window.h"
#include "WindowManager.h"
#include <AK/Memory.h>
#include <AK/ScopeGuard.h>
#include <LibCore/Timer.h>
#include <LibGfx/Font.h>
#include <LibGfx/Painter.h>
#include <LibThread/BackgroundAction.h>
//#define COMPOSE_DEBUG
//#define OCCLUSIONS_DEBUG
namespace WindowServer {
Compositor& Compositor::the()
{
static Compositor s_the;
return s_the;
}
static WallpaperMode mode_to_enum(const String& name)
{
if (name == "simple")
return WallpaperMode::Simple;
if (name == "tile")
return WallpaperMode::Tile;
if (name == "center")
return WallpaperMode::Center;
if (name == "scaled")
return WallpaperMode::Scaled;
return WallpaperMode::Simple;
}
Compositor::Compositor()
{
m_display_link_notify_timer = add<Core::Timer>(
1000 / 60, [this] {
notify_display_links();
});
m_display_link_notify_timer->stop();
m_compose_timer = Core::Timer::create_single_shot(
1000 / 60,
[this] {
compose();
},
this);
m_immediate_compose_timer = Core::Timer::create_single_shot(
0,
[this] {
compose();
},
this);
m_screen_can_set_buffer = Screen::the().can_set_buffer();
init_bitmaps();
}
void Compositor::init_bitmaps()
{
auto& screen = Screen::the();
auto size = screen.size();
m_front_bitmap = Gfx::Bitmap::create_wrapper(Gfx::BitmapFormat::RGB32, size, screen.pitch(), screen.scanline(0));
if (m_screen_can_set_buffer)
m_back_bitmap = Gfx::Bitmap::create_wrapper(Gfx::BitmapFormat::RGB32, size, screen.pitch(), screen.scanline(size.height()));
else
m_back_bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::RGB32, size);
m_temp_bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::RGB32, size);
m_front_painter = make<Gfx::Painter>(*m_front_bitmap);
m_back_painter = make<Gfx::Painter>(*m_back_bitmap);
m_temp_painter = make<Gfx::Painter>(*m_temp_bitmap);
m_buffers_are_flipped = false;
invalidate_screen();
}
void Compositor::compose()
{
auto& wm = WindowManager::the();
if (m_wallpaper_mode == WallpaperMode::Unchecked)
m_wallpaper_mode = mode_to_enum(wm.config()->read_entry("Background", "Mode", "simple"));
auto& ws = Screen::the();
if (!m_invalidated_any) {
// nothing dirtied since the last compose pass.
return;
}
if (m_occlusions_dirty) {
m_occlusions_dirty = false;
recompute_occlusions();
}
auto dirty_screen_rects = move(m_dirty_screen_rects);
dirty_screen_rects.add(m_last_geometry_label_rect.intersected(ws.rect()));
dirty_screen_rects.add(m_last_dnd_rect.intersected(ws.rect()));
if (m_invalidated_cursor) {
if (wm.dnd_client())
dirty_screen_rects.add(wm.dnd_rect().intersected(ws.rect()));
}
// Mark window regions as dirty that need to be re-rendered
wm.for_each_visible_window_from_back_to_front([&](Window& window) {
auto frame_rect = window.frame().rect();
for (auto& dirty_rect : dirty_screen_rects.rects()) {
auto invalidate_rect = dirty_rect.intersected(frame_rect);
if (!invalidate_rect.is_empty()) {
auto inner_rect_offset = window.rect().location() - frame_rect.location();
invalidate_rect.move_by(-(frame_rect.location() + inner_rect_offset));
window.invalidate_no_notify(invalidate_rect);
m_invalidated_window = true;
}
}
window.prepare_dirty_rects();
return IterationDecision::Continue;
});
// Any windows above or below a given window that need to be re-rendered
// also require us to re-render that window's intersecting area, regardless
// of whether that window has any dirty rectangles
wm.for_each_visible_window_from_back_to_front([&](Window& window) {
auto& transparency_rects = window.transparency_rects();
if (transparency_rects.is_empty())
return IterationDecision::Continue;
auto frame_rect = window.frame().rect();
auto& dirty_rects = window.dirty_rects();
wm.for_each_visible_window_from_back_to_front([&](Window& w) {
if (&w == &window)
return IterationDecision::Continue;
auto frame_rect2 = w.frame().rect();
if (!frame_rect2.intersects(frame_rect))
return IterationDecision::Continue;
transparency_rects.for_each_intersected(w.dirty_rects(), [&](const Gfx::IntRect& intersected_dirty) {
dirty_rects.add(intersected_dirty);
return IterationDecision::Continue;
});
return IterationDecision::Continue;
});
return IterationDecision::Continue;
});
Color background_color = wm.palette().desktop_background();
String background_color_entry = wm.config()->read_entry("Background", "Color", "");
if (!background_color_entry.is_empty()) {
background_color = Color::from_string(background_color_entry).value_or(background_color);
}
#ifdef COMPOSE_DEBUG
dbg() << "COMPOSE: invalidated: window:" << m_invalidated_window << " cursor:" << m_invalidated_cursor << " any: " << m_invalidated_any;
for (auto& r : dirty_screen_rects.rects())
dbg() << "dirty screen: " << r;
#endif
Gfx::DisjointRectSet flush_rects;
Gfx::DisjointRectSet flush_transparent_rects;
Gfx::DisjointRectSet flush_special_rects;
auto cursor_rect = current_cursor_rect();
bool need_to_draw_cursor = false;
auto check_restore_cursor_back = [&](const Gfx::IntRect& rect) {
if (!need_to_draw_cursor && rect.intersects(cursor_rect)) {
// Restore what's behind the cursor if anything touches the area of the cursor
need_to_draw_cursor = true;
restore_cursor_back();
}
};
auto prepare_rect = [&](const Gfx::IntRect& rect) {
#ifdef COMPOSE_DEBUG
dbg() << " -> flush opaque: " << rect;
#endif
ASSERT(!flush_rects.intersects(rect));
ASSERT(!flush_transparent_rects.intersects(rect));
flush_rects.add(rect);
check_restore_cursor_back(rect);
};
auto prepare_transparency_rect = [&](const Gfx::IntRect& rect) {
// This function may be called multiple times with the same
// rect as we walk the window stack from back to front. However,
// there should be no overlaps with flush_rects
#ifdef COMPOSE_DEBUG
dbg() << " -> flush transparent: " << rect;
#endif
ASSERT(!flush_rects.intersects(rect));
bool have_rect = false;
for (auto& r : flush_transparent_rects.rects()) {
if (r == rect) {
have_rect = true;
break;
}
}
if (!have_rect) {
flush_transparent_rects.add(rect);
check_restore_cursor_back(rect);
}
};
if (!m_cursor_back_bitmap || m_invalidated_cursor)
check_restore_cursor_back(cursor_rect);
auto back_painter = *m_back_painter;
auto temp_painter = *m_temp_painter;
auto paint_wallpaper = [&](Gfx::Painter& painter, const Gfx::IntRect& rect) {
// FIXME: If the wallpaper is opaque, no need to fill with color!
painter.fill_rect(rect, background_color);
if (m_wallpaper) {
if (m_wallpaper_mode == WallpaperMode::Simple) {
painter.blit(rect.location(), *m_wallpaper, rect);
} else if (m_wallpaper_mode == WallpaperMode::Center) {
Gfx::IntPoint offset { ws.size().width() / 2 - m_wallpaper->size().width() / 2,
ws.size().height() / 2 - m_wallpaper->size().height() / 2 };
painter.blit_offset(rect.location(), *m_wallpaper,
rect, offset);
} else if (m_wallpaper_mode == WallpaperMode::Tile) {
painter.draw_tiled_bitmap(rect, *m_wallpaper);
} else if (m_wallpaper_mode == WallpaperMode::Scaled) {
float hscale = (float)m_wallpaper->size().width() / (float)ws.size().width();
float vscale = (float)m_wallpaper->size().height() / (float)ws.size().height();
// TODO: this may look ugly, we should scale to a backing bitmap and then blit
painter.blit_scaled(rect, *m_wallpaper, rect, hscale, vscale);
} else {
ASSERT_NOT_REACHED();
}
}
};
m_opaque_wallpaper_rects.for_each_intersected(dirty_screen_rects, [&](const Gfx::IntRect& render_rect) {
#ifdef COMPOSE_DEBUG
dbg() << " render wallpaper opaque: " << render_rect;
#endif
prepare_rect(render_rect);
paint_wallpaper(back_painter, render_rect);
return IterationDecision::Continue;
});
auto compose_window = [&](Window& window) -> IterationDecision {
auto frame_rect = window.frame().rect();
if (!frame_rect.intersects(ws.rect()))
return IterationDecision::Continue;
auto frame_rects = frame_rect.shatter(window.rect());
#ifdef COMPOSE_DEBUG
dbg() << " window " << window.title() << " frame rect: " << frame_rect;
#endif
RefPtr<Gfx::Bitmap> backing_store = window.backing_store();
auto compose_window_rect = [&](Gfx::Painter& painter, const Gfx::IntRect& rect) {
if (!window.is_fullscreen()) {
rect.for_each_intersected(frame_rects, [&](const Gfx::IntRect& intersected_rect) {
// TODO: Should optimize this to use a backing buffer
Gfx::PainterStateSaver saver(painter);
painter.add_clip_rect(intersected_rect);
#ifdef COMPOSE_DEBUG
dbg() << " render frame: " << intersected_rect;
#endif
window.frame().paint(painter);
return IterationDecision::Continue;
});
}
if (!backing_store) {
if (window.is_opaque())
painter.fill_rect(window.rect().intersected(rect), wm.palette().window());
return;
}
// Decide where we would paint this window's backing store.
// This is subtly different from widow.rect(), because window
// size may be different from its backing store size. This
// happens when the window has been resized and the client
// has not yet attached a new backing store. In this case,
// we want to try to blit the backing store at the same place
// it was previously, and fill the rest of the window with its
// background color.
Gfx::IntRect backing_rect;
backing_rect.set_size(backing_store->size());
switch (WindowManager::the().resize_direction_of_window(window)) {
case ResizeDirection::None:
case ResizeDirection::Right:
case ResizeDirection::Down:
case ResizeDirection::DownRight:
backing_rect.set_location(window.rect().location());
break;
case ResizeDirection::Left:
case ResizeDirection::Up:
case ResizeDirection::UpLeft:
backing_rect.set_right_without_resize(window.rect().right());
backing_rect.set_bottom_without_resize(window.rect().bottom());
break;
case ResizeDirection::UpRight:
backing_rect.set_left(window.rect().left());
backing_rect.set_bottom_without_resize(window.rect().bottom());
break;
case ResizeDirection::DownLeft:
backing_rect.set_right_without_resize(window.rect().right());
backing_rect.set_top(window.rect().top());
break;
}
Gfx::IntRect dirty_rect_in_backing_coordinates = rect.intersected(window.rect())
.intersected(backing_rect)
.translated(-backing_rect.location());
if (dirty_rect_in_backing_coordinates.is_empty())
return;
auto dst = backing_rect.location().translated(dirty_rect_in_backing_coordinates.location());
if (window.client() && window.client()->is_unresponsive()) {
painter.blit_filtered(dst, *backing_store, dirty_rect_in_backing_coordinates, [](Color src) {
return src.to_grayscale().darkened(0.75f);
});
} else {
painter.blit(dst, *backing_store, dirty_rect_in_backing_coordinates, window.opacity());
}
for (auto background_rect : window.rect().shatter(backing_rect))
painter.fill_rect(background_rect, wm.palette().window());
};
auto& dirty_rects = window.dirty_rects();
#ifdef COMPOSE_DEBUG
for (auto& dirty_rect : dirty_rects.rects())
dbg() << " dirty: " << dirty_rect;
for (auto& r : window.opaque_rects().rects())
dbg() << " opaque: " << r;
for (auto& r : window.transparency_rects().rects())
dbg() << " transparent: " << r;
#endif
// Render opaque portions directly to the back buffer
auto& opaque_rects = window.opaque_rects();
if (!opaque_rects.is_empty()) {
opaque_rects.for_each_intersected(dirty_rects, [&](const Gfx::IntRect& render_rect) {
#ifdef COMPOSE_DEBUG
dbg() << " render opaque: " << render_rect;
#endif
prepare_rect(render_rect);
Gfx::PainterStateSaver saver(back_painter);
back_painter.add_clip_rect(render_rect);
compose_window_rect(back_painter, render_rect);
return IterationDecision::Continue;
});
}
// Render the wallpaper for any transparency directly covering
// the wallpaper
auto& transparency_wallpaper_rects = window.transparency_wallpaper_rects();
if (!transparency_wallpaper_rects.is_empty()) {
transparency_wallpaper_rects.for_each_intersected(dirty_rects, [&](const Gfx::IntRect& render_rect) {
#ifdef COMPOSE_DEBUG
dbg() << " render wallpaper: " << render_rect;
#endif
prepare_transparency_rect(render_rect);
paint_wallpaper(temp_painter, render_rect);
return IterationDecision::Continue;
});
}
auto& transparency_rects = window.transparency_rects();
if (!transparency_rects.is_empty()) {
transparency_rects.for_each_intersected(dirty_rects, [&](const Gfx::IntRect& render_rect) {
#ifdef COMPOSE_DEBUG
dbg() << " render transparent: " << render_rect;
#endif
prepare_transparency_rect(render_rect);
Gfx::PainterStateSaver saver(temp_painter);
temp_painter.add_clip_rect(render_rect);
compose_window_rect(temp_painter, render_rect);
return IterationDecision::Continue;
});
}
return IterationDecision::Continue;
};
// Paint the window stack.
if (m_invalidated_window) {
if (auto* fullscreen_window = wm.active_fullscreen_window()) {
compose_window(*fullscreen_window);
} else {
wm.for_each_visible_window_from_back_to_front([&](Window& window) {
compose_window(window);
window.clear_dirty_rects();
return IterationDecision::Continue;
});
}
// Check that there are no overlapping transparent and opaque flush rectangles
ASSERT(![&]() {
for (auto& rect_transparent : flush_transparent_rects.rects()) {
for (auto& rect_opaque : flush_rects.rects()) {
if (rect_opaque.intersects(rect_transparent)) {
dbg() << "Transparent rect " << rect_transparent << " overlaps opaque rect: " << rect_opaque << ": " << rect_opaque.intersected(rect_transparent);
return true;
}
}
}
return false;
}());
// Copy anything rendered to the temporary buffer to the back buffer
for (auto& rect : flush_transparent_rects.rects())
back_painter.blit(rect.location(), *m_temp_bitmap, rect);
Gfx::IntRect geometry_label_rect;
if (draw_geometry_label(geometry_label_rect))
flush_special_rects.add(geometry_label_rect);
}
m_invalidated_any = false;
m_invalidated_window = false;
m_invalidated_cursor = false;
if (wm.dnd_client()) {
auto dnd_rect = wm.dnd_rect();
// TODO: render once into a backing bitmap, then just blit...
auto render_dnd = [&]() {
back_painter.fill_rect(dnd_rect, wm.palette().selection().with_alpha(200));
if (!wm.dnd_text().is_empty()) {
auto text_rect = dnd_rect;
if (wm.dnd_bitmap())
text_rect.move_by(wm.dnd_bitmap()->width(), 0);
back_painter.draw_text(text_rect, wm.dnd_text(), Gfx::TextAlignment::CenterLeft, wm.palette().selection_text());
}
if (wm.dnd_bitmap()) {
back_painter.blit(dnd_rect.top_left(), *wm.dnd_bitmap(), wm.dnd_bitmap()->rect());
}
};
dirty_screen_rects.for_each_intersected(dnd_rect, [&](const Gfx::IntRect& render_rect) {
Gfx::PainterStateSaver saver(back_painter);
back_painter.add_clip_rect(render_rect);
render_dnd();
return IterationDecision::Continue;
});
flush_transparent_rects.for_each_intersected(dnd_rect, [&](const Gfx::IntRect& render_rect) {
Gfx::PainterStateSaver saver(back_painter);
back_painter.add_clip_rect(render_rect);
render_dnd();
return IterationDecision::Continue;
});
m_last_dnd_rect = dnd_rect;
} else {
if (!m_last_dnd_rect.is_empty()) {
invalidate_screen(m_last_dnd_rect);
m_last_dnd_rect = {};
}
}
run_animations(flush_special_rects);
if (need_to_draw_cursor) {
flush_rects.add(cursor_rect);
if (cursor_rect != m_last_cursor_rect)
flush_rects.add(m_last_cursor_rect);
draw_cursor(cursor_rect);
}
if (m_flash_flush) {
for (auto& rect : flush_rects.rects())
m_front_painter->fill_rect(rect, Color::Yellow);
}
if (m_screen_can_set_buffer)
flip_buffers();
for (auto& rect : flush_rects.rects())
flush(rect);
for (auto& rect : flush_transparent_rects.rects())
flush(rect);
for (auto& rect : flush_special_rects.rects())
flush(rect);
}
void Compositor::flush(const Gfx::IntRect& a_rect)
{
auto rect = Gfx::IntRect::intersection(a_rect, Screen::the().rect());
Gfx::RGBA32* front_ptr = m_front_bitmap->scanline(rect.y()) + rect.x();
Gfx::RGBA32* back_ptr = m_back_bitmap->scanline(rect.y()) + rect.x();
size_t pitch = m_back_bitmap->pitch();
// NOTE: The meaning of a flush depends on whether we can flip buffers or not.
//
// If flipping is supported, flushing means that we've flipped, and now we
// copy the changed bits from the front buffer to the back buffer, to keep
// them in sync.
//
// If flipping is not supported, flushing means that we copy the changed
// rects from the backing bitmap to the display framebuffer.
Gfx::RGBA32* to_ptr;
const Gfx::RGBA32* from_ptr;
if (m_screen_can_set_buffer) {
to_ptr = back_ptr;
from_ptr = front_ptr;
} else {
to_ptr = front_ptr;
from_ptr = back_ptr;
}
for (int y = 0; y < rect.height(); ++y) {
fast_u32_copy(to_ptr, from_ptr, rect.width());
from_ptr = (const Gfx::RGBA32*)((const u8*)from_ptr + pitch);
to_ptr = (Gfx::RGBA32*)((u8*)to_ptr + pitch);
}
}
void Compositor::invalidate_screen()
{
invalidate_screen(Screen::the().rect());
}
void Compositor::invalidate_screen(const Gfx::IntRect& screen_rect)
{
m_dirty_screen_rects.add(screen_rect.intersected(Screen::the().rect()));
if (m_invalidated_any)
return;
m_invalidated_any = true;
m_invalidated_window = true;
start_compose_async_timer();
}
void Compositor::invalidate_window()
{
if (m_invalidated_window)
return;
m_invalidated_window = true;
m_invalidated_any = true;
start_compose_async_timer();
}
void Compositor::start_compose_async_timer()
{
// We delay composition by a timer interval, but to not affect latency too
// much, if a pending compose is not already scheduled, we also schedule an
// immediate compose the next spin of the event loop.
if (!m_compose_timer->is_active()) {
m_compose_timer->start();
m_immediate_compose_timer->start();
}
}
bool Compositor::set_background_color(const String& background_color)
{
auto& wm = WindowManager::the();
wm.config()->write_entry("Background", "Color", background_color);
bool ret_val = wm.config()->sync();
if (ret_val)
Compositor::invalidate_screen();
return ret_val;
}
bool Compositor::set_wallpaper_mode(const String& mode)
{
auto& wm = WindowManager::the();
wm.config()->write_entry("Background", "Mode", mode);
bool ret_val = wm.config()->sync();
if (ret_val) {
m_wallpaper_mode = mode_to_enum(mode);
Compositor::invalidate_screen();
}
return ret_val;
}
bool Compositor::set_wallpaper(const String& path, Function<void(bool)>&& callback)
{
LibThread::BackgroundAction<RefPtr<Gfx::Bitmap>>::create(
[path] {
return Gfx::Bitmap::load_from_file(path);
},
[this, path, callback = move(callback)](RefPtr<Gfx::Bitmap> bitmap) {
m_wallpaper_path = path;
m_wallpaper = move(bitmap);
invalidate_screen();
callback(true);
});
return true;
}
void Compositor::flip_buffers()
{
ASSERT(m_screen_can_set_buffer);
swap(m_front_bitmap, m_back_bitmap);
swap(m_front_painter, m_back_painter);
Screen::the().set_buffer(m_buffers_are_flipped ? 0 : 1);
m_buffers_are_flipped = !m_buffers_are_flipped;
}
void Compositor::run_animations(Gfx::DisjointRectSet& flush_rects)
{
static const int minimize_animation_steps = 10;
WindowManager::the().for_each_window([&](Window& window) {
if (window.in_minimize_animation()) {
int animation_index = window.minimize_animation_index();
auto from_rect = window.is_minimized() ? window.frame().rect() : window.taskbar_rect();
auto to_rect = window.is_minimized() ? window.taskbar_rect() : window.frame().rect();
float x_delta_per_step = (float)(from_rect.x() - to_rect.x()) / minimize_animation_steps;
float y_delta_per_step = (float)(from_rect.y() - to_rect.y()) / minimize_animation_steps;
float width_delta_per_step = (float)(from_rect.width() - to_rect.width()) / minimize_animation_steps;
float height_delta_per_step = (float)(from_rect.height() - to_rect.height()) / minimize_animation_steps;
Gfx::IntRect rect {
from_rect.x() - (int)(x_delta_per_step * animation_index),
from_rect.y() - (int)(y_delta_per_step * animation_index),
from_rect.width() - (int)(width_delta_per_step * animation_index),
from_rect.height() - (int)(height_delta_per_step * animation_index)
};
#ifdef MINIMIZE_ANIMATION_DEBUG
dbg() << "Minimize animation from " << from_rect << " to " << to_rect << " frame# " << animation_index << " " << rect;
#endif
m_back_painter->draw_rect(rect, Color::White);
flush_rects.add(rect);
invalidate_screen(rect);
window.step_minimize_animation();
if (window.minimize_animation_index() >= minimize_animation_steps)
window.end_minimize_animation();
}
return IterationDecision::Continue;
});
}
bool Compositor::set_resolution(int desired_width, int desired_height)
{
auto screen_rect = Screen::the().rect();
if (screen_rect.width() == desired_width && screen_rect.height() == desired_height)
return true;
// Make sure it's impossible to set an invalid resolution
if (!(desired_width >= 640 && desired_height >= 480)) {
dbg() << "Compositor: Tried to set invalid resolution: " << desired_width << "x" << desired_height;
return false;
}
bool success = Screen::the().set_resolution(desired_width, desired_height);
init_bitmaps();
invalidate_occlusions();
compose();
return success;
}
Gfx::IntRect Compositor::current_cursor_rect() const
{
auto& wm = WindowManager::the();
return { Screen::the().cursor_location().translated(-wm.active_cursor().hotspot()), wm.active_cursor().size() };
}
void Compositor::invalidate_cursor()
{
if (m_invalidated_cursor)
return;
m_invalidated_cursor = true;
m_invalidated_any = true;
start_compose_async_timer();
}
bool Compositor::draw_geometry_label(Gfx::IntRect& geometry_label_rect)
{
auto& wm = WindowManager::the();
auto* window_being_moved_or_resized = wm.m_move_window ? wm.m_move_window.ptr() : (wm.m_resize_window ? wm.m_resize_window.ptr() : nullptr);
if (!window_being_moved_or_resized) {
m_last_geometry_label_rect = {};
return false;
}
auto geometry_string = window_being_moved_or_resized->rect().to_string();
if (!window_being_moved_or_resized->size_increment().is_null()) {
int width_steps = (window_being_moved_or_resized->width() - window_being_moved_or_resized->base_size().width()) / window_being_moved_or_resized->size_increment().width();
int height_steps = (window_being_moved_or_resized->height() - window_being_moved_or_resized->base_size().height()) / window_being_moved_or_resized->size_increment().height();
geometry_string = String::format("%s (%dx%d)", geometry_string.characters(), width_steps, height_steps);
}
geometry_label_rect = Gfx::IntRect { 0, 0, wm.font().width(geometry_string) + 16, wm.font().glyph_height() + 10 };
geometry_label_rect.center_within(window_being_moved_or_resized->rect());
auto& back_painter = *m_back_painter;
back_painter.fill_rect(geometry_label_rect, wm.palette().window());
back_painter.draw_rect(geometry_label_rect, wm.palette().threed_shadow2());
back_painter.draw_text(geometry_label_rect, geometry_string, Gfx::TextAlignment::Center, wm.palette().window_text());
m_last_geometry_label_rect = geometry_label_rect;
return true;
}
void Compositor::draw_cursor(const Gfx::IntRect& cursor_rect)
{
auto& wm = WindowManager::the();
if (!m_cursor_back_bitmap || m_cursor_back_bitmap->size() != cursor_rect.size()) {
m_cursor_back_bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::RGB32, cursor_rect.size());
m_cursor_back_painter = make<Gfx::Painter>(*m_cursor_back_bitmap);
}
m_cursor_back_painter->blit({0, 0}, *m_back_bitmap, wm.active_cursor().rect().translated(cursor_rect.location()).intersected(Screen::the().rect()));
auto& back_painter = *m_back_painter;
back_painter.blit(cursor_rect.location(), wm.active_cursor().bitmap(), wm.active_cursor().rect());
m_last_cursor_rect = cursor_rect;
}
void Compositor::restore_cursor_back()
{
if (!m_cursor_back_bitmap)
return;
m_back_painter->blit(m_last_cursor_rect.location().constrained(Screen::the().rect()), *m_cursor_back_bitmap, { { 0, 0 }, m_last_cursor_rect.intersected(Screen::the().rect()).size() });
}
void Compositor::notify_display_links()
{
ClientConnection::for_each_client([](auto& client) {
client.notify_display_link({});
});
}
void Compositor::increment_display_link_count(Badge<ClientConnection>)
{
++m_display_link_count;
if (m_display_link_count == 1)
m_display_link_notify_timer->start();
}
void Compositor::decrement_display_link_count(Badge<ClientConnection>)
{
ASSERT(m_display_link_count);
--m_display_link_count;
if (!m_display_link_count)
m_display_link_notify_timer->stop();
}
bool Compositor::any_opaque_window_above_this_one_contains_rect(const Window& a_window, const Gfx::IntRect& rect)
{
bool found_containing_window = false;
bool checking = false;
WindowManager::the().for_each_visible_window_from_back_to_front([&](Window& window) {
if (&window == &a_window) {
checking = true;
return IterationDecision::Continue;
}
if (!checking)
return IterationDecision::Continue;
if (!window.is_visible())
return IterationDecision::Continue;
if (window.is_minimized())
return IterationDecision::Continue;
if (!window.is_opaque())
return IterationDecision::Continue;
if (window.frame().rect().contains(rect)) {
found_containing_window = true;
return IterationDecision::Break;
}
return IterationDecision::Continue;
});
return found_containing_window;
};
void Compositor::recompute_occlusions()
{
auto& wm = WindowManager::the();
wm.for_each_visible_window_from_back_to_front([&](Window& window) {
if (wm.m_switcher.is_visible()) {
window.set_occluded(false);
} else {
if (any_opaque_window_above_this_one_contains_rect(window, window.frame().rect()))
window.set_occluded(true);
else
window.set_occluded(false);
}
return IterationDecision::Continue;
});
#ifdef OCCLUSIONS_DEBUG
dbg() << "OCCLUSIONS:";
#endif
auto screen_rect = Screen::the().rect();
if (auto* fullscreen_window = wm.active_fullscreen_window()) {
WindowManager::the().for_each_visible_window_from_front_to_back([&](Window& w) {
auto& visible_opaque = w.opaque_rects();
auto& transparency_rects = w.transparency_rects();
auto& transparency_wallpaper_rects = w.transparency_wallpaper_rects();
if (&w == fullscreen_window) {
if (w.is_opaque()) {
visible_opaque = screen_rect;
transparency_rects.clear();
transparency_wallpaper_rects.clear();
} else {
visible_opaque.clear();
transparency_rects = screen_rect;
transparency_wallpaper_rects = screen_rect;
}
} else {
visible_opaque.clear();
transparency_rects.clear();
transparency_wallpaper_rects.clear();
}
return IterationDecision::Continue;
});
m_opaque_wallpaper_rects.clear();
} else {
Gfx::DisjointRectSet visible_rects(screen_rect);
bool have_transparent = false;
WindowManager::the().for_each_visible_window_from_front_to_back([&](Window& w) {
auto window_frame_rect = w.frame().rect().intersected(screen_rect);
w.transparency_wallpaper_rects().clear();
auto& visible_opaque = w.opaque_rects();
auto& transparency_rects = w.transparency_rects();
if (w.is_minimized() || window_frame_rect.is_empty()) {
visible_opaque.clear();
transparency_rects.clear();
return IterationDecision::Continue;
}
Gfx::DisjointRectSet opaque_covering;
if (w.is_opaque()) {
visible_opaque = visible_rects.intersected(window_frame_rect);
transparency_rects.clear();
} else {
visible_opaque.clear();
transparency_rects = visible_rects.intersected(window_frame_rect);
}
bool found_this_window = false;
WindowManager::the().for_each_visible_window_from_back_to_front([&](Window& w2) {
if (!found_this_window) {
if (&w == &w2)
found_this_window = true;
return IterationDecision::Continue;
}
if (w2.is_minimized())
return IterationDecision::Continue;
auto window_frame_rect2 = w2.frame().rect().intersected(screen_rect);
auto covering_rect = window_frame_rect2.intersected(window_frame_rect);
if (covering_rect.is_empty())
return IterationDecision::Continue;
if (w2.is_opaque()) {
opaque_covering.add(covering_rect);
if (opaque_covering.contains(window_frame_rect)) {
// This window is entirely covered by another opaque window
visible_opaque.clear();
transparency_rects.clear();
return IterationDecision::Break;
}
if (!visible_opaque.is_empty()) {
auto uncovered_opaque = visible_opaque.shatter(covering_rect);
visible_opaque = move(uncovered_opaque);
}
if (!transparency_rects.is_empty()) {
auto uncovered_transparency = transparency_rects.shatter(covering_rect);
transparency_rects = move(uncovered_transparency);
}
} else {
visible_rects.for_each_intersected(covering_rect, [&](const Gfx::IntRect& intersected) {
transparency_rects.add(intersected);
if (!visible_opaque.is_empty()) {
auto uncovered_opaque = visible_opaque.shatter(intersected);
visible_opaque = move(uncovered_opaque);
}
return IterationDecision::Continue;
});
}
return IterationDecision::Continue;
});
if (!transparency_rects.is_empty())
have_transparent = true;
ASSERT(!visible_opaque.intersects(transparency_rects));
if (w.is_opaque()) {
// Determine visible area for the window below
auto visible_rects_below_window = visible_rects.shatter(window_frame_rect);
visible_rects = move(visible_rects_below_window);
}
return IterationDecision::Continue;
});
if (have_transparent) {
// Determine what transparent window areas need to render the wallpaper first
WindowManager::the().for_each_visible_window_from_back_to_front([&](Window& w) {
auto& transparency_wallpaper_rects = w.transparency_wallpaper_rects();
if (w.is_opaque() || w.is_minimized()) {
transparency_wallpaper_rects.clear();
return IterationDecision::Continue;
}
Gfx::DisjointRectSet& transparency_rects = w.transparency_rects();
if (transparency_rects.is_empty()) {
transparency_wallpaper_rects.clear();
return IterationDecision::Continue;
}
transparency_wallpaper_rects = visible_rects.intersected(transparency_rects);
auto remaining_visible = visible_rects.shatter(transparency_wallpaper_rects);
visible_rects = move(remaining_visible);
return IterationDecision::Continue;
});
}
m_opaque_wallpaper_rects = move(visible_rects);
}
#ifdef OCCLUSIONS_DEBUG
for (auto& r : m_opaque_wallpaper_rects.rects())
dbg() << " wallpaper opaque: " << r;
#endif
wm.for_each_visible_window_from_back_to_front([&](Window& w) {
auto window_frame_rect = w.frame().rect().intersected(screen_rect);
if (w.is_minimized() || window_frame_rect.is_empty())
return IterationDecision::Continue;
#ifdef OCCLUSIONS_DEBUG
dbg() << " Window " << w.title() << " frame rect: " << window_frame_rect;
for (auto& r : w.opaque_rects().rects())
dbg() << " opaque: " << r;
for (auto& r : w.transparency_wallpaper_rects().rects())
dbg() << " transparent wallpaper: " << r;
for (auto& r : w.transparency_rects().rects())
dbg() << " transparent: " << r;
#endif
ASSERT(!w.opaque_rects().intersects(m_opaque_wallpaper_rects));
ASSERT(!w.transparency_rects().intersects(m_opaque_wallpaper_rects));
ASSERT(!w.transparency_wallpaper_rects().intersects(m_opaque_wallpaper_rects));
return IterationDecision::Continue;
});
}
}
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