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Userland: Implement a magnifier app

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This utility is useful for making sure those UI elements are pixel
perfect. A simple 2x/4x magnification around the mouse cursor, shown in
a window.
This commit is contained in:
Valtteri Koskivuori 2021-05-10 00:15:35 +03:00 • committed by Linus Groh
parent 4864ef9440
commit 4d01183f5c
6 changed files with 183 additions and 0 deletions
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57
Userland/Applications/Magnifier/MagnifierWidget.cpp Normal file
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/*
* Copyright (c) 2021, Valtteri Koskivuori <vkoskiv@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "MagnifierWidget.h"
#include <LibGUI/Painter.h>
#include <LibGUI/Window.h>
#include <LibGUI/WindowServerConnection.h>
#include <LibGfx/AffineTransform.h>
#include <math.h>
MagnifierWidget::MagnifierWidget()
{
}
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::timer_event(Core::TimerEvent&)
{
m_mouse_position = GUI::WindowServerConnection::the().get_global_cursor_position();
update();
}
void MagnifierWidget::paint_event(GUI::PaintEvent&)
{
GUI::Painter painter(*this);
int grab_frame_size = 200;
grab_frame_size /= m_scale_factor;
// Paint our screenshot
Gfx::Rect region { m_mouse_position.x() - (grab_frame_size / 2), m_mouse_position.y() - (grab_frame_size / 2), grab_frame_size, grab_frame_size };
auto map = GUI::WindowServerConnection::the().get_screen_bitmap(region);
painter.draw_scaled_bitmap(rect(), *map.bitmap(), map.bitmap()->rect());
}