File indexing completed on 2024-11-10 04:56:36

 /*
     KWin - the KDE window manager
     This file is part of the KDE project.
 
     SPDX-FileCopyrightText: 2011 Arthur Arlt <a.arlt@stud.uni-heidelberg.de>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "x11_standalone_overlaywindow.h"
 
 #include "compositor.h"
 #include "core/renderloop.h"
 #include "scene/workspacescene.h"
 #include "utils/xcbutils.h"
 #include "x11_standalone_backend.h"
 
 #include <QList>
 
 #include <xcb/composite.h>
 #include <xcb/shape.h>
 #if XCB_COMPOSITE_MAJOR_VERSION > 0 || XCB_COMPOSITE_MINOR_VERSION >= 3
 #define KWIN_HAVE_XCOMPOSITE_OVERLAY
 #endif
 
 namespace KWin
 {
 OverlayWindowX11::OverlayWindowX11(X11StandaloneBackend *backend)
     : OverlayWindow()
     , X11EventFilter(QList<int>{XCB_EXPOSE, XCB_VISIBILITY_NOTIFY})
     , m_visible(true)
     , m_shown(false)
     , m_backend(backend)
     , m_window(XCB_WINDOW_NONE)
 {
 }
 
 OverlayWindowX11::~OverlayWindowX11()
 {
 }
 
 bool OverlayWindowX11::create()
 {
     Q_ASSERT(m_window == XCB_WINDOW_NONE);
     if (!Xcb::Extensions::self()->isCompositeOverlayAvailable()) {
         return false;
     }
     if (!Xcb::Extensions::self()->isShapeInputAvailable()) { // needed in setupOverlay()
         return false;
     }
 #ifdef KWIN_HAVE_XCOMPOSITE_OVERLAY
     Xcb::OverlayWindow overlay(rootWindow());
     if (overlay.isNull()) {
         return false;
     }
     m_window = overlay->overlay_win;
     if (m_window == XCB_WINDOW_NONE) {
         return false;
     }
     return true;
 #else
     return false;
 #endif
 }
 
 void OverlayWindowX11::setup(xcb_window_t window)
 {
     Q_ASSERT(m_window != XCB_WINDOW_NONE);
     Q_ASSERT(Xcb::Extensions::self()->isShapeInputAvailable());
     setNoneBackgroundPixmap(m_window);
     if (m_size.isValid()) {
         setShape(QRect(0, 0, m_size.width(), m_size.height()));
     }
     if (window != XCB_WINDOW_NONE) {
         setNoneBackgroundPixmap(window);
         setupInputShape(window);
     }
     const uint32_t eventMask = XCB_EVENT_MASK_VISIBILITY_CHANGE;
     xcb_change_window_attributes(connection(), m_window, XCB_CW_EVENT_MASK, &eventMask);
 }
 
 void OverlayWindowX11::setupInputShape(xcb_window_t window)
 {
     xcb_shape_rectangles(connection(), XCB_SHAPE_SO_SET, XCB_SHAPE_SK_INPUT, XCB_CLIP_ORDERING_UNSORTED, window, 0, 0, 0, nullptr);
 }
 
 void OverlayWindowX11::setNoneBackgroundPixmap(xcb_window_t window)
 {
     const uint32_t mask = XCB_BACK_PIXMAP_NONE;
     xcb_change_window_attributes(connection(), window, XCB_CW_BACK_PIXMAP, &mask);
 }
 
 void OverlayWindowX11::show()
 {
     Q_ASSERT(m_window != XCB_WINDOW_NONE);
     if (m_shown) {
         return;
     }
     xcb_map_subwindows(connection(), m_window);
     xcb_map_window(connection(), m_window);
     m_shown = true;
 }
 
 void OverlayWindowX11::hide()
 {
     Q_ASSERT(m_window != XCB_WINDOW_NONE);
     xcb_unmap_window(connection(), m_window);
     m_shown = false;
     const QSize &s = m_size;
     setShape(QRect(0, 0, s.width(), s.height()));
 }
 
 void OverlayWindowX11::setShape(const QRegion &reg)
 {
     // Avoid setting the same shape again, it causes flicker (apparently it is not a no-op
     // and triggers something).
     if (reg == m_shape) {
         return;
     }
     const QList<xcb_rectangle_t> xrects = Xcb::regionToRects(reg);
     xcb_shape_rectangles(connection(), XCB_SHAPE_SO_SET, XCB_SHAPE_SK_BOUNDING, XCB_CLIP_ORDERING_UNSORTED,
                          m_window, 0, 0, xrects.count(), xrects.data());
     setupInputShape(m_window);
     m_shape = reg;
 }
 
 void OverlayWindowX11::resize(const QSize &size)
 {
     m_size = size;
     if (m_window == XCB_WINDOW_NONE) {
         return;
     }
     const uint32_t geometry[2] = {
         static_cast<uint32_t>(size.width()),
         static_cast<uint32_t>(size.height())};
     xcb_configure_window(connection(), m_window, XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT, geometry);
     setShape(QRegion(0, 0, size.width(), size.height()));
 }
 
 bool OverlayWindowX11::isVisible() const
 {
     return m_visible;
 }
 
 void OverlayWindowX11::setVisibility(bool visible)
 {
     m_visible = visible;
 }
 
 void OverlayWindowX11::destroy()
 {
     if (m_window == XCB_WINDOW_NONE) {
         return;
     }
     // reset the overlay shape
     xcb_rectangle_t rec = {0, 0, static_cast<uint16_t>(m_size.width()), static_cast<uint16_t>(m_size.height())};
     xcb_shape_rectangles(connection(), XCB_SHAPE_SO_SET, XCB_SHAPE_SK_BOUNDING, XCB_CLIP_ORDERING_UNSORTED, m_window, 0, 0, 1, &rec);
     xcb_shape_rectangles(connection(), XCB_SHAPE_SO_SET, XCB_SHAPE_SK_INPUT, XCB_CLIP_ORDERING_UNSORTED, m_window, 0, 0, 1, &rec);
 #ifdef KWIN_HAVE_XCOMPOSITE_OVERLAY
     xcb_composite_release_overlay_window(connection(), m_window);
 #endif
     m_window = XCB_WINDOW_NONE;
     m_shown = false;
 }
 
 xcb_window_t OverlayWindowX11::window() const
 {
     return m_window;
 }
 
 bool OverlayWindowX11::event(xcb_generic_event_t *event)
 {
     const uint8_t eventType = event->response_type & ~0x80;
     if (eventType == XCB_EXPOSE) {
         const auto *expose = reinterpret_cast<xcb_expose_event_t *>(event);
         if (expose->window == rootWindow() // root window needs repainting
             || (m_window != XCB_WINDOW_NONE && expose->window == m_window)) { // overlay needs repainting
             Compositor::self()->scene()->addRepaint(expose->x, expose->y, expose->width, expose->height);
         }
     } else if (eventType == XCB_VISIBILITY_NOTIFY) {
         const auto *visibility = reinterpret_cast<xcb_visibility_notify_event_t *>(event);
         if (m_window != XCB_WINDOW_NONE && visibility->window == m_window) {
             bool was_visible = isVisible();
             setVisibility((visibility->state != XCB_VISIBILITY_FULLY_OBSCURED));
             auto compositor = Compositor::self();
             if (!was_visible && m_visible) {
                 // hack for #154825
                 compositor->scene()->addRepaintFull();
                 QTimer::singleShot(2000, compositor, [compositor]() {
                     if (compositor->compositing()) {
                         compositor->scene()->addRepaintFull();
                     }
                 });
             }
             m_backend->renderLoop()->scheduleRepaint();
         }
     }
     return false;
 }
 
 } // namespace KWin