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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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
#define register /* C++17 deprecated register */
#include <X11/Xlib.h>
#undef register
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()).alphaUsage() == QPixelFormat::UsesAlpha;
}
}
QXcbNativeBackingStore::~QXcbNativeBackingStore()
{}
QPaintDevice *QXcbNativeBackingStore::paintDevice()
{
return &m_pixmap;
}
void QXcbNativeBackingStore::flush(QWindow *window, const QRegion ®ion, 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);
QList<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, 0L /*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 ®ion)
{
QX11PlatformPixmap *x11pm = qt_x11Pixmap(m_pixmap);
if (x11pm)
x11pm->setIsBackingStore(true);
#if QT_CONFIG(xrender)
if (m_translucentBackground) {
const QList<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
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