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Magnifier: Use a GUI::DisplayLink to drive the screen captures

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This ensures that we don't try to update more often than the screen
is updated. It also avoids doing synchronous IPC in paint_event().
This commit is contained in:
Andreas Kling 2021-06-07 09:35:07 +02:00
parent 61c56e75f4
commit 0ea1fd2d54
Notes: sideshowbarker 2024-07-18 12:43:10 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/0ea1fd2d547
3 changed files with 13 additions and 8 deletions
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16
Userland/Applications/Magnifier/MagnifierWidget.cpp
View File

@ -5,6 +5,7 @@
*/
#include "MagnifierWidget.h"
#include <LibGUI/DisplayLink.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Window.h>
#include <LibGUI/WindowServerConnection.h>
@ -12,6 +13,7 @@
MagnifierWidget::MagnifierWidget()
{
GUI::DisplayLink::register_callback([this](auto) { sync(); });
}
MagnifierWidget::~MagnifierWidget()
@ -35,10 +37,15 @@ void MagnifierWidget::set_scale_factor(int scale_factor)
update();
}
void MagnifierWidget::timer_event(Core::TimerEvent&)
void MagnifierWidget::sync()
{
m_mouse_position = GUI::WindowServerConnection::the().get_global_cursor_position();
m_desktop_display_scale = GUI::WindowServerConnection::the().get_desktop_display_scale();
// Grab and paint our screenshot.
Gfx::IntSize region_size { size().width() / m_scale_factor, size().height() / m_scale_factor };
Gfx::Rect region { (m_mouse_position.x() * m_desktop_display_scale) - (region_size.width() / 2), (m_mouse_position.y() * m_desktop_display_scale) - (region_size.height() / 2), region_size.width(), region_size.height() };
m_grabbed_bitmap = GUI::WindowServerConnection::the().get_screen_bitmap(region).bitmap();
update();
}
@ -46,9 +53,6 @@ void MagnifierWidget::paint_event(GUI::PaintEvent&)
{
GUI::Painter painter(*this);
// Grab and paint our screenshot.
Gfx::IntSize region_size { size().width() / m_scale_factor, size().height() / m_scale_factor };
Gfx::Rect region { (m_mouse_position.x() * m_desktop_display_scale) - (region_size.width() / 2), (m_mouse_position.y() * m_desktop_display_scale) - (region_size.height() / 2), region_size.width(), region_size.height() };
auto map = GUI::WindowServerConnection::the().get_screen_bitmap(region);
painter.draw_scaled_bitmap(rect(), *map.bitmap(), map.bitmap()->rect());
if (m_grabbed_bitmap)
painter.draw_scaled_bitmap(rect(), *m_grabbed_bitmap, m_grabbed_bitmap->rect());
}

4
Userland/Applications/Magnifier/MagnifierWidget.h
View File

@ -19,10 +19,12 @@ public:
void track_cursor_globally();
private:
virtual void timer_event(Core::TimerEvent&) override;
virtual void paint_event(GUI::PaintEvent&) override;
void sync();
Gfx::IntPoint m_mouse_position;
int m_scale_factor { 2 };
int m_desktop_display_scale { 1 };
RefPtr<Gfx::Bitmap> m_grabbed_bitmap;
};

1
Userland/Applications/Magnifier/main.cpp
View File

@ -84,7 +84,6 @@ int main(int argc, char** argv)
window->show();
magnifier.track_cursor_globally();
magnifier.start_timer(16);
return app->exec();
}