mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 07:58:11 +00:00
0ea1fd2d54
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().
58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
/*
|
|
* Copyright (c) 2021, Valtteri Koskivuori <vkoskiv@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include "MagnifierWidget.h"
|
|
#include <LibGUI/DisplayLink.h>
|
|
#include <LibGUI/Painter.h>
|
|
#include <LibGUI/Window.h>
|
|
#include <LibGUI/WindowServerConnection.h>
|
|
#include <LibGfx/Rect.h>
|
|
|
|
MagnifierWidget::MagnifierWidget()
|
|
{
|
|
GUI::DisplayLink::register_callback([this](auto) { sync(); });
|
|
}
|
|
|
|
MagnifierWidget::~MagnifierWidget()
|
|
{
|
|
}
|
|
|
|
void MagnifierWidget::track_cursor_globally()
|
|
{
|
|
VERIFY(window());
|
|
auto window_id = window()->window_id();
|
|
VERIFY(window_id >= 0);
|
|
|
|
set_global_cursor_tracking(true);
|
|
GUI::WindowServerConnection::the().set_global_cursor_tracking(window_id, true);
|
|
}
|
|
|
|
void MagnifierWidget::set_scale_factor(int scale_factor)
|
|
{
|
|
VERIFY(scale_factor == 2 || scale_factor == 4);
|
|
m_scale_factor = scale_factor;
|
|
update();
|
|
}
|
|
|
|
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();
|
|
}
|
|
|
|
void MagnifierWidget::paint_event(GUI::PaintEvent&)
|
|
{
|
|
GUI::Painter painter(*this);
|
|
|
|
if (m_grabbed_bitmap)
|
|
painter.draw_scaled_bitmap(rect(), *m_grabbed_bitmap, m_grabbed_bitmap->rect());
|
|
}
|