void QWindowsBackingStore::resize(const QSize &sizeDip, const QRegion ®ionDip)
{
const QSize size = sizeDip * QWindowsScaling::factor();
if (m_image.isNull() || m_image->image().size() != size) {
#ifndef QT_NO_DEBUG_OUTPUT
if (QWindowsContext::verbose && lcQpaBackingStore().isDebugEnabled()) {
qCDebug(lcQpaBackingStore)
<< __FUNCTION__ << ' ' << window() << ' ' << size << ' ' << sizeDip << ' '
<< regionDip << " from: " << (m_image.isNull() ? QSize() : m_image->image().size());
}
#endif
const QImage::Format format = window()->format().hasAlpha() ?
QImage::Format_ARGB32_Premultiplied : QWindowsNativeImage::systemFormat();
QWindowsNativeImage *oldwni = m_image.data();
QWindowsNativeImage *newwni = new QWindowsNativeImage(size.width(), size.height(), format);
if (oldwni && !regionDip.isEmpty()) {
const QImage &oldimg(oldwni->image());
QImage &newimg(newwni->image());
QRegion staticRegion = QWindowsScaling::mapToNative(regionDip);
staticRegion &= QRect(0, 0, oldimg.width(), oldimg.height());
staticRegion &= QRect(0, 0, newimg.width(), newimg.height());
QPainter painter(&newimg);
painter.setCompositionMode(QPainter::CompositionMode_Source);
foreach (const QRect &rect, staticRegion.rects())
painter.drawImage(rect, oldimg, rect);
}
if (QWindowsScaling::isActive())
newwni->setDevicePixelRatio(QWindowsScaling::factor());
m_image.reset(newwni);
}
}
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::baseWindowOf(window);
#ifndef Q_OS_WINCE
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 = window->frameGeometry();
QPoint frameOffset(window->frameMargins().left(), window->frameMargins().top());
QRect dirtyRect = br.translated(offset + frameOffset);
SIZE size = {r.width(), r.height()};
POINT ptDst = {r.x(), r.y()};
POINT ptSrc = {0, 0};
BLENDFUNCTION blend = {AC_SRC_OVER, 0, (BYTE)(255.0 * rw->opacity()), AC_SRC_ALPHA};
if (QWindowsContext::user32dll.updateLayeredWindowIndirect) {
RECT dirty = {dirtyRect.x(), dirtyRect.y(),
dirtyRect.x() + dirtyRect.width(), dirtyRect.y() + dirtyRect.height()};
UPDATELAYEREDWINDOWINFO info = {sizeof(info), NULL, &ptDst, &size, m_image->hdc(), &ptSrc, 0, &blend, ULW_ALPHA, &dirty};
QWindowsContext::user32dll.updateLayeredWindowIndirect(rw->handle(), &info);
} else {
QWindowsContext::user32dll.updateLayeredWindow(rw->handle(), NULL, &ptDst, &size, m_image->hdc(), &ptSrc, 0, &blend, ULW_ALPHA);
}
} else {
#endif
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(lastError, "%s: BitBlt failed", __FUNCTION__);
}
rw->releaseDC();
#ifndef Q_OS_WINCE
}
#endif
// 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;
}
}
