1 files changed, 209 insertions, 0 deletions
diff --git a/src/plugins/platforms/xcb/nativepainting/qbackingstore_x11.cpp b/src/plugins/platforms/xcb/nativepainting/qbackingstore_x11.cpp
new file mode 100644
index 0000000000..9b31998620
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+++ b/src/plugins/platforms/xcb/nativepainting/qbackingstore_x11.cpp
@@ -0,0 +1,209 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qbackingstore_x11_p.h"
+#include "qxcbwindow.h"
+#include "qpixmap_x11_p.h"
+
+#include <private/qhighdpiscaling_p.h>
+#include <QPainter>
+
+#if QT_CONFIG(xrender)
+# include <X11/extensions/Xrender.h>
+#endif
+
+#include <X11/Xlib.h>
+
+#ifndef None
+#define None 0L
+#endif
+
+QT_BEGIN_NAMESPACE
+
+QXcbNativeBackingStore::QXcbNativeBackingStore(QWindow *window)
+    : QPlatformBackingStore(window)
+    , m_translucentBackground(false)
+{
+    if (QXcbWindow *w = static_cast<QXcbWindow *>(window->handle()))
+        m_translucentBackground = w->connection()->hasXRender() && QImage::toPixelFormat(w->imageFormat()).alphaSize() > 0;
+}
+
+QXcbNativeBackingStore::~QXcbNativeBackingStore()
+{}
+
+QPaintDevice *QXcbNativeBackingStore::paintDevice()
+{
+    return &m_pixmap;
+}
+
+void QXcbNativeBackingStore::flush(QWindow *window, const QRegion &region, const QPoint &offset)
+{
+    if (m_pixmap.isNull())
+        return;
+
+    QSize pixmapSize = m_pixmap.size();
+
+    QRegion clipped = region;
+    clipped &= QRect(QPoint(), QHighDpi::toNativePixels(window->size(), window));
+    clipped &= QRect(0, 0, pixmapSize.width(), pixmapSize.height()).translated(-offset);
+
+    QRect br = clipped.boundingRect();
+    if (br.isNull())
+        return;
+
+    QXcbWindow *platformWindow = static_cast<QXcbWindow *>(window->handle());
+    if (!platformWindow) {
+        qWarning("QXcbBackingStore::flush: QWindow has no platform window (QTBUG-32681)");
+        return;
+    }
+
+    Window wid = platformWindow->xcb_window();
+    Pixmap pid = qt_x11PixmapHandle(m_pixmap);
+
+    QVector<XRectangle> clipRects = qt_region_to_xrectangles(clipped);
+
+#if QT_CONFIG(xrender)
+    if (m_translucentBackground)
+    {
+        XWindowAttributes attrib;
+        XGetWindowAttributes(display(), wid, &attrib);
+        XRenderPictFormat *format = XRenderFindVisualFormat(display(), attrib.visual);
+
+        Picture srcPic = qt_x11PictureHandle(m_pixmap);
+        Picture dstPic = XRenderCreatePicture(display(), wid, format, 0, 0);
+
+        XRenderSetPictureClipRectangles(display(), dstPic, 0, 0, clipRects.constData(), clipRects.size());
+
+        XRenderComposite(display(), PictOpSrc, srcPic, None, dstPic,
+                         br.x() + offset.x(), br.y() + offset.y(),
+                         0, 0,
+                         br.x(), br.y(),
+                         br.width(), br.height());
+
+        XRenderFreePicture(display(), dstPic);
+    }
+    else
+#endif
+    {
+        GC gc = XCreateGC(display(), wid, 0, nullptr);
+
+        if (clipRects.size() != 1)
+            XSetClipRectangles(display(), gc, 0, 0, clipRects.data(), clipRects.size(), YXBanded);
+
+        XCopyArea(display(), pid, wid, gc, br.x() + offset.x(), br.y() + offset.y(), br.width(), br.height(), br.x(), br.y());
+        XFreeGC(display(), gc);
+    }
+
+
+    if (platformWindow->needsSync()) {
+        platformWindow->updateSyncRequestCounter();
+    } else {
+        XFlush(display());
+    }
+}
+
+QImage QXcbNativeBackingStore::toImage() const
+{
+    return m_pixmap.toImage();
+}
+
+void QXcbNativeBackingStore::resize(const QSize &size, const QRegion &staticContents)
+{
+    if (size == m_pixmap.size())
+        return;
+
+    QPixmap newPixmap(size);
+
+#if QT_CONFIG(xrender)
+    if (m_translucentBackground && newPixmap.depth() != 32)
+        qt_x11Pixmap(newPixmap)->convertToARGB32();
+#endif
+
+    if (!m_pixmap.isNull()) {
+        Pixmap from = qt_x11PixmapHandle(m_pixmap);
+        Pixmap to = qt_x11PixmapHandle(newPixmap);
+        QRect br = staticContents.boundingRect().intersected(QRect(QPoint(0, 0), size));
+
+        if (!br.isEmpty()) {
+            GC gc = XCreateGC(display(), to, 0, nullptr);
+            XCopyArea(display(), from, to, gc, br.x(), br.y(), br.width(), br.height(), br.x(), br.y());
+            XFreeGC(display(), gc);
+        }
+    }
+
+    m_pixmap = newPixmap;
+}
+
+bool QXcbNativeBackingStore::scroll(const QRegion &area, int dx, int dy)
+{
+    if (m_pixmap.isNull())
+        return false;
+
+    QRect rect = area.boundingRect();
+    Pixmap pix = qt_x11PixmapHandle(m_pixmap);
+
+    GC gc = XCreateGC(display(), pix, 0, nullptr);
+    XCopyArea(display(), pix, pix, gc,
+              rect.x(), rect.y(), rect.width(), rect.height(),
+              rect.x()+dx, rect.y()+dy);
+    XFreeGC(display(), gc);
+    return true;
+}
+
+void QXcbNativeBackingStore::beginPaint(const QRegion &region)
+{
+#if QT_CONFIG(xrender)
+    if (m_translucentBackground) {
+        const QVector<XRectangle> xrects = qt_region_to_xrectangles(region);
+        const XRenderColor color = { 0, 0, 0, 0 };
+        XRenderFillRectangles(display(), PictOpSrc,
+                              qt_x11PictureHandle(m_pixmap), &color,
+                              xrects.constData(), xrects.size());
+    }
+#else
+    Q_UNUSED(region);
+#endif
+}
+
+Display *QXcbNativeBackingStore::display() const
+{
+    return static_cast<Display *>(static_cast<QXcbWindow *>(window()->handle())->connection()->xlib_display());
+}
+
+QT_END_NAMESPACE