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https://github.com/LadybirdBrowser/ladybird.git
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a698a58d3c
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
117 lines
4.1 KiB
C++
117 lines
4.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibGfx/CharacterBitmap.h>
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#include <LibGfx/Painter.h>
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#include <LibGfx/StylePainter.h>
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#include <WindowServer/Button.h>
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#include <WindowServer/Event.h>
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#include <WindowServer/WindowManager.h>
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namespace WindowServer {
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Button::Button(WindowFrame& frame, Function<void(Button&)>&& on_click_handler)
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: on_click(move(on_click_handler))
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, m_frame(frame)
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{
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}
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Button::~Button()
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{
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}
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void Button::paint(Gfx::Painter& painter)
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{
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auto palette = WindowManager::the().palette();
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Gfx::PainterStateSaver saver(painter);
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painter.translate(relative_rect().location());
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Gfx::StylePainter::paint_button(painter, rect(), palette, Gfx::ButtonStyle::Normal, m_pressed, m_hovered);
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if (m_icon) {
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auto icon_location = rect().center().translated(-(m_icon->width() / 2), -(m_icon->height() / 2));
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if (m_pressed)
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painter.translate(1, 1);
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painter.blit(icon_location, *m_icon, m_icon->rect());
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}
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}
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void Button::on_mouse_event(const MouseEvent& event)
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{
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auto& wm = WindowManager::the();
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if (event.type() == Event::MouseDown && event.button() == MouseButton::Left) {
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m_pressed = true;
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wm.set_cursor_tracking_button(this);
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m_frame.invalidate(m_relative_rect);
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return;
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}
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if (event.type() == Event::MouseUp && event.button() == MouseButton::Left) {
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if (wm.cursor_tracking_button() != this)
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return;
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wm.set_cursor_tracking_button(nullptr);
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bool old_pressed = m_pressed;
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m_pressed = false;
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if (rect().contains(event.position())) {
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if (on_click)
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on_click(*this);
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}
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if (old_pressed != m_pressed) {
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// Would like to compute:
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// m_hovered = rect_after_action().contains(event.position());
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// However, we don't know that rect yet. We can make an educated
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// guess which also looks okay even when wrong:
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m_hovered = false;
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m_frame.invalidate(m_relative_rect);
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}
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return;
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}
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if (event.type() == Event::MouseMove) {
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bool old_hovered = m_hovered;
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m_hovered = rect().contains(event.position());
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wm.set_hovered_button(m_hovered ? this : nullptr);
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if (old_hovered != m_hovered)
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m_frame.invalidate(m_relative_rect);
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}
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if (event.type() == Event::MouseMove && event.buttons() & (unsigned)MouseButton::Left) {
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if (wm.cursor_tracking_button() != this)
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return;
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bool old_pressed = m_pressed;
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m_pressed = m_hovered;
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if (old_pressed != m_pressed)
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m_frame.invalidate(m_relative_rect);
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}
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}
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Gfx::IntRect Button::screen_rect() const
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{
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return m_relative_rect.translated(m_frame.rect().location());
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}
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}
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