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// Copyright (C) 2016 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 "qwindowsbackingstore.h"
#include "qwindowswindow.h"
#include "qwindowscontext.h"
#include <QtGui/qwindow.h>
#include <QtGui/qpainter.h>
#include <QtGui/private/qwindowsnativeimage_p.h>
#include <private/qhighdpiscaling_p.h>
#include <private/qimage_p.h>
#include <QtCore/qdebug.h>
QT_BEGIN_NAMESPACE
/*!
\class QWindowsBackingStore
\brief Backing store for windows.
\internal
*/
QWindowsBackingStore::QWindowsBackingStore(QWindow *window) :
QPlatformBackingStore(window),
m_alphaNeedsFill(false)
{
qCDebug(lcQpaBackingStore) << __FUNCTION__ << this << window;
}
QWindowsBackingStore::~QWindowsBackingStore()
{
qCDebug(lcQpaBackingStore) << __FUNCTION__ << this;
}
QPaintDevice *QWindowsBackingStore::paintDevice()
{
Q_ASSERT(!m_image.isNull());
return &m_image->image();
}
void QWindowsBackingStore::flush(QWindow *window, const QRegion ®ion,
const QPoint &offset)
{
Q_ASSERT(window);
const QRect br = region.boundingRect();
if (QWindowsContext::verbose > 1)
qCDebug(lcQpaBackingStore) << __FUNCTION__ << this << window << offset << br;
QWindowsWindow *rw = QWindowsWindow::windowsWindowOf(window);
Q_ASSERT(rw);
const bool hasAlpha = rw->format().hasAlpha();
const Qt::WindowFlags flags = window->flags();
if ((flags & Qt::FramelessWindowHint) && QWindowsWindow::setWindowLayered(rw->handle(), flags, hasAlpha, rw->opacity()) && hasAlpha) {
// Windows with alpha: Use blend function to update.
QRect r = QHighDpi::toNativePixels(window->frameGeometry(), window);
QMargins frameMargins = rw->frameMargins();
QRect dirtyRect = br.translated(offset + QPoint(frameMargins.left(), frameMargins.top()));
SIZE size = {r.width(), r.height()};
POINT ptDst = {r.x(), r.y()};
POINT ptSrc = {0, 0};
BLENDFUNCTION blend = {AC_SRC_OVER, 0, BYTE(qRound(255.0 * rw->opacity())), AC_SRC_ALPHA};
RECT dirty = {dirtyRect.x(), dirtyRect.y(),
dirtyRect.x() + dirtyRect.width(), dirtyRect.y() + dirtyRect.height()};
UPDATELAYEREDWINDOWINFO info = {sizeof(info), nullptr, &ptDst, &size,
m_image->hdc(), &ptSrc, 0, &blend, ULW_ALPHA, &dirty};
const BOOL result = UpdateLayeredWindowIndirect(rw->handle(), &info);
if (!result)
qErrnoWarning("UpdateLayeredWindowIndirect failed for ptDst=(%d, %d),"
" size=(%dx%d), dirty=(%dx%d %d, %d)", r.x(), r.y(),
r.width(), r.height(), dirtyRect.width(), dirtyRect.height(),
dirtyRect.x(), dirtyRect.y());
} else {
const HDC dc = rw->getDC();
if (!dc) {
qErrnoWarning("%s: GetDC failed", __FUNCTION__);
return;
}
if (!BitBlt(dc, br.x(), br.y(), br.width(), br.height(),
m_image->hdc(), br.x() + offset.x(), br.y() + offset.y(), SRCCOPY)) {
const DWORD lastError = GetLastError(); // QTBUG-35926, QTBUG-29716: may fail after lock screen.
if (lastError != ERROR_SUCCESS && lastError != ERROR_INVALID_HANDLE)
qErrnoWarning(int(lastError), "%s: BitBlt failed", __FUNCTION__);
}
rw->releaseDC();
}
// Write image for debug purposes.
if (QWindowsContext::verbose > 2 && lcQpaBackingStore().isDebugEnabled()) {
static int n = 0;
const QString fileName = QString::fromLatin1("win%1_%2.png").
arg(rw->winId()).arg(n++);
m_image->image().save(fileName);
qCDebug(lcQpaBackingStore) << "Wrote " << m_image->image().size() << fileName;
}
}
void QWindowsBackingStore::resize(const QSize &size, const QRegion ®ion)
{
if (m_image.isNull() || m_image->image().size() != size) {
#ifndef QT_NO_DEBUG_OUTPUT
if (QWindowsContext::verbose && lcQpaBackingStore().isDebugEnabled()) {
qCDebug(lcQpaBackingStore)
<< __FUNCTION__ << ' ' << window() << ' ' << size << ' ' << region
<< " from: " << (m_image.isNull() ? QSize() : m_image->image().size());
}
#endif
QImage::Format format = window()->format().hasAlpha() ?
QImage::Format_ARGB32_Premultiplied : QWindowsNativeImage::systemFormat();
// The backingstore composition (enabling render-to-texture widgets)
// punches holes in the backingstores using the alpha channel. Hence
// the need for a true alpha format.
if (QImage::toPixelFormat(format).alphaUsage() == QPixelFormat::UsesAlpha)
m_alphaNeedsFill = true;
else // upgrade but here we know app painting does not rely on alpha hence no need to fill
format = qt_maybeAlphaVersionWithSameDepth(format);
QWindowsNativeImage *oldwni = m_image.data();
auto *newwni = new QWindowsNativeImage(size.width(), size.height(), format);
if (oldwni && !region.isEmpty()) {
const QImage &oldimg(oldwni->image());
QImage &newimg(newwni->image());
QRegion staticRegion(region);
staticRegion &= QRect(0, 0, oldimg.width(), oldimg.height());
staticRegion &= QRect(0, 0, newimg.width(), newimg.height());
QPainter painter(&newimg);
painter.setCompositionMode(QPainter::CompositionMode_Source);
for (const QRect &rect : staticRegion)
painter.drawImage(rect, oldimg, rect);
}
m_image.reset(newwni);
}
}
Q_GUI_EXPORT void qt_scrollRectInImage(QImage &img, const QRect &rect, const QPoint &offset);
bool QWindowsBackingStore::scroll(const QRegion &area, int dx, int dy)
{
if (m_image.isNull() || m_image->image().isNull())
return false;
const QPoint offset(dx, dy);
const QRect rect = area.boundingRect();
qt_scrollRectInImage(m_image->image(), rect, offset);
return true;
}
void QWindowsBackingStore::beginPaint(const QRegion ®ion)
{
if (QWindowsContext::verbose > 1)
qCDebug(lcQpaBackingStore) <<__FUNCTION__ << region;
if (m_alphaNeedsFill) {
QPainter p(&m_image->image());
p.setCompositionMode(QPainter::CompositionMode_Source);
const QColor blank = Qt::transparent;
for (const QRect &r : region)
p.fillRect(r, blank);
}
}
HDC QWindowsBackingStore::getDC() const
{
if (!m_image.isNull())
return m_image->hdc();
return nullptr;
}
QImage QWindowsBackingStore::toImage() const
{
if (m_image.isNull()) {
qCWarning(lcQpaBackingStore) <<__FUNCTION__ << "Image is null.";
return QImage();
}
return m_image.data()->image();
}
QT_END_NAMESPACE
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