File indexing completed on 2024-05-19 05:32:21

 /*
     SPDX-FileCopyrightText: 2021 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "scene/surfaceitem_x11.h"
 #include "compositor_x11.h"
 #include "core/renderbackend.h"
 #include "x11syncmanager.h"
 #include "x11window.h"
 
 namespace KWin
 {
 
 SurfaceItemX11::SurfaceItemX11(X11Window *window, Scene *scene, Item *parent)
     : SurfaceItem(scene, parent)
     , m_window(window)
 {
     connect(window, &Window::bufferGeometryChanged,
             this, &SurfaceItemX11::handleBufferGeometryChanged);
     connect(window, &X11Window::shapeChanged,
             this, &SurfaceItemX11::handleShapeChanged);
 
     m_damageHandle = xcb_generate_id(kwinApp()->x11Connection());
     xcb_damage_create(kwinApp()->x11Connection(), m_damageHandle, window->frameId(),
                       XCB_DAMAGE_REPORT_LEVEL_NON_EMPTY);
 
     // With unmanaged windows there is a race condition between the client painting the window
     // and us setting up damage tracking.  If the client wins we won't get a damage event even
     // though the window has been painted.  To avoid this we mark the whole window as damaged
     // immediately after creating the damage object.
     if (window->isUnmanaged()) {
         m_isDamaged = true;
     }
 
     setDestinationSize(window->bufferGeometry().size());
     setBufferSourceBox(QRectF(QPointF(0, 0), window->bufferGeometry().size()));
     setBufferSize(window->bufferGeometry().size().toSize());
 }
 
 SurfaceItemX11::~SurfaceItemX11()
 {
     destroyDamage();
 }
 
 X11Window *SurfaceItemX11::window() const
 {
     return m_window;
 }
 
 void SurfaceItemX11::preprocess()
 {
     if (!damage().isEmpty()) {
         X11Compositor *compositor = X11Compositor::self();
         if (X11SyncManager *syncManager = compositor->syncManager()) {
             syncManager->insertWait();
         }
     }
     SurfaceItem::preprocess();
 }
 
 void SurfaceItemX11::processDamage()
 {
     m_isDamaged = true;
     scheduleFrame();
 }
 
 bool SurfaceItemX11::fetchDamage()
 {
     if (!m_isDamaged) {
         return false;
     }
 
     if (m_damageHandle == XCB_NONE) {
         return true;
     }
 
     xcb_xfixes_region_t region = xcb_generate_id(kwinApp()->x11Connection());
     xcb_xfixes_create_region(kwinApp()->x11Connection(), region, 0, nullptr);
     xcb_damage_subtract(kwinApp()->x11Connection(), m_damageHandle, 0, region);
 
     m_damageCookie = xcb_xfixes_fetch_region_unchecked(kwinApp()->x11Connection(), region);
     xcb_xfixes_destroy_region(kwinApp()->x11Connection(), region);
 
     m_havePendingDamageRegion = true;
 
     return true;
 }
 
 void SurfaceItemX11::waitForDamage()
 {
     if (!m_havePendingDamageRegion) {
         return;
     }
     m_havePendingDamageRegion = false;
 
     xcb_xfixes_fetch_region_reply_t *reply =
         xcb_xfixes_fetch_region_reply(kwinApp()->x11Connection(), m_damageCookie, nullptr);
     if (!reply) {
         qCDebug(KWIN_CORE) << "Failed to check damage region";
         return;
     }
 
     const int rectCount = xcb_xfixes_fetch_region_rectangles_length(reply);
     QRegion region;
 
     if (rectCount > 1 && rectCount < 16) {
         xcb_rectangle_t *rects = xcb_xfixes_fetch_region_rectangles(reply);
 
         QList<QRect> qtRects;
         qtRects.reserve(rectCount);
 
         for (int i = 0; i < rectCount; ++i) {
             qtRects << QRect(rects[i].x, rects[i].y, rects[i].width, rects[i].height);
         }
         region.setRects(qtRects.constData(), rectCount);
     } else {
         region = QRect(reply->extents.x, reply->extents.y, reply->extents.width, reply->extents.height);
     }
     free(reply);
 
     addDamage(region);
     m_isDamaged = false;
 }
 
 void SurfaceItemX11::forgetDamage()
 {
     // If the window is destroyed, we cannot destroy XDamage handle. :/
     m_isDamaged = false;
     m_damageHandle = XCB_NONE;
 }
 
 void SurfaceItemX11::destroyDamage()
 {
     if (m_damageHandle != XCB_NONE) {
         m_isDamaged = false;
         xcb_damage_destroy(kwinApp()->x11Connection(), m_damageHandle);
         m_damageHandle = XCB_NONE;
     }
 }
 
 void SurfaceItemX11::handleBufferGeometryChanged()
 {
     setDestinationSize(m_window->bufferGeometry().size());
     setBufferSourceBox(QRectF(QPointF(0, 0), m_window->bufferGeometry().size()));
     setBufferSize(m_window->bufferGeometry().size().toSize());
 }
 
 void SurfaceItemX11::handleShapeChanged()
 {
     scheduleRepaint(boundingRect());
     discardQuads();
 }
 
 QList<QRectF> SurfaceItemX11::shape() const
 {
     const QRectF clipRect = m_window->clientGeometry().translated(-m_window->bufferGeometry().topLeft());
     QList<QRectF> shape = m_window->shapeRegion();
     // bounded to clipRect
     for (QRectF &shapePart : shape) {
         shapePart = shapePart.intersected(clipRect);
     }
     return shape;
 }
 
 QRegion SurfaceItemX11::opaque() const
 {
     QRegion shapeRegion;
     for (const QRectF &shapePart : shape()) {
         shapeRegion += shapePart.toRect();
     }
     if (!m_window->hasAlpha()) {
         return shapeRegion;
     } else {
         return m_window->opaqueRegion() & shapeRegion;
     }
     return QRegion();
 }
 
 std::unique_ptr<SurfacePixmap> SurfaceItemX11::createPixmap()
 {
     return std::make_unique<SurfacePixmapX11>(this);
 }
 
 SurfacePixmapX11::SurfacePixmapX11(SurfaceItemX11 *item, QObject *parent)
     : SurfacePixmap(Compositor::self()->backend()->createSurfaceTextureX11(this), parent)
     , m_item(item)
 {
 }
 
 SurfacePixmapX11::~SurfacePixmapX11()
 {
     if (m_pixmap != XCB_PIXMAP_NONE) {
         xcb_free_pixmap(kwinApp()->x11Connection(), m_pixmap);
     }
 }
 
 bool SurfacePixmapX11::isValid() const
 {
     return m_pixmap != XCB_PIXMAP_NONE;
 }
 
 xcb_pixmap_t SurfacePixmapX11::pixmap() const
 {
     return m_pixmap;
 }
 
 xcb_visualid_t SurfacePixmapX11::visual() const
 {
     return m_item->window()->visual();
 }
 
 void SurfacePixmapX11::create()
 {
     const X11Window *window = m_item->window();
     if (window->isDeleted()) {
         return;
     }
 
     XServerGrabber grabber;
     xcb_connection_t *connection = kwinApp()->x11Connection();
     xcb_window_t frame = window->frameId();
     xcb_pixmap_t pixmap = xcb_generate_id(connection);
     xcb_void_cookie_t namePixmapCookie = xcb_composite_name_window_pixmap_checked(connection,
                                                                                   frame,
                                                                                   pixmap);
     Xcb::WindowAttributes windowAttributes(frame);
     Xcb::WindowGeometry windowGeometry(frame);
     if (xcb_generic_error_t *error = xcb_request_check(connection, namePixmapCookie)) {
         qCDebug(KWIN_CORE, "Failed to create window pixmap for window 0x%x (error code %d)",
                 window->window(), error->error_code);
         free(error);
         return;
     }
     // check that the received pixmap is valid and actually matches what we
     // know about the window (i.e. size)
     if (!windowAttributes || windowAttributes->map_state != XCB_MAP_STATE_VIEWABLE) {
         qCDebug(KWIN_CORE, "Failed to create window pixmap for window 0x%x (not viewable)",
                 window->window());
         xcb_free_pixmap(connection, pixmap);
         return;
     }
     const QRectF bufferGeometry = window->bufferGeometry();
     if (windowGeometry.size() != bufferGeometry.size()) {
         qCDebug(KWIN_CORE, "Failed to create window pixmap for window 0x%x: window size (%fx%f) != buffer size (%fx%f)", window->window(),
                 windowGeometry.size().width(), windowGeometry.size().height(), bufferGeometry.width(), bufferGeometry.height());
         xcb_free_pixmap(connection, pixmap);
         return;
     }
 
     m_pixmap = pixmap;
     m_hasAlphaChannel = window->hasAlpha();
     // this class is only used on X11 where the logical size and
     // device pixel size is guaranteed to be the same and we can convert safely
     m_size = bufferGeometry.size().toSize();
 }
 
 } // namespace KWin
 
 #include "moc_surfaceitem_x11.cpp"