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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "qwasmcompositor.h"
#include "qwasmwindow.h"
#include <private/qeventdispatcher_wasm_p.h>
#include <qpa/qwindowsysteminterface.h>
#include <emscripten/html5.h>
using namespace emscripten;
bool QWasmCompositor::m_requestUpdateHoldEnabled = true;
QWasmCompositor::QWasmCompositor(QWasmScreen *screen) : QObject(screen)
{
QWindowSystemInterface::setSynchronousWindowSystemEvents(true);
}
QWasmCompositor::~QWasmCompositor()
{
if (m_requestAnimationFrameId != -1)
emscripten_cancel_animation_frame(m_requestAnimationFrameId);
// TODO(mikolaj.boc): Investigate if m_isEnabled is needed at all. It seems like a frame should
// not be generated after this instead.
m_isEnabled = false; // prevent frame() from creating a new m_context
}
void QWasmCompositor::onWindowTreeChanged(QWasmWindowTreeNodeChangeType changeType,
QWasmWindow *window)
{
auto allWindows = screen()->allWindows();
setEnabled(std::any_of(allWindows.begin(), allWindows.end(), [](QWasmWindow *element) {
return !element->context2d().isUndefined();
}));
if (changeType == QWasmWindowTreeNodeChangeType::NodeRemoval)
m_requestUpdateWindows.remove(window);
}
void QWasmCompositor::setEnabled(bool enabled)
{
m_isEnabled = enabled;
}
// requestUpdate delivery is initially disabled at startup, while Qt completes
// startup tasks such as font loading. This function enables requestUpdate delivery
// again.
bool QWasmCompositor::releaseRequestUpdateHold()
{
const bool wasEnabled = m_requestUpdateHoldEnabled;
m_requestUpdateHoldEnabled = false;
return wasEnabled;
}
void QWasmCompositor::requestUpdateWindow(QWasmWindow *window, UpdateRequestDeliveryType updateType)
{
auto it = m_requestUpdateWindows.find(window);
if (it == m_requestUpdateWindows.end()) {
m_requestUpdateWindows.insert(window, updateType);
} else {
// Already registered, but upgrade ExposeEventDeliveryType to UpdateRequestDeliveryType.
// if needed, to make sure QWindow::updateRequest's are matched.
if (it.value() == ExposeEventDelivery && updateType == UpdateRequestDelivery)
it.value() = UpdateRequestDelivery;
}
requestUpdate();
}
// Requests an update/new frame using RequestAnimationFrame
void QWasmCompositor::requestUpdate()
{
if (m_requestAnimationFrameId != -1)
return;
if (m_requestUpdateHoldEnabled)
return;
static auto frame = [](double frameTime, void *context) -> int {
Q_UNUSED(frameTime);
QWasmCompositor *compositor = reinterpret_cast<QWasmCompositor *>(context);
compositor->m_requestAnimationFrameId = -1;
compositor->deliverUpdateRequests();
return 0;
};
m_requestAnimationFrameId = emscripten_request_animation_frame(frame, this);
}
void QWasmCompositor::deliverUpdateRequests()
{
// We may get new update requests during the window content update below:
// prepare for recording the new update set by setting aside the current
// update set.
auto requestUpdateWindows = m_requestUpdateWindows;
m_requestUpdateWindows.clear();
// Update window content, either all windows or a spesific set of windows. Use the correct
// update type: QWindow subclasses expect that requested and delivered updateRequests matches
// exactly.
m_inDeliverUpdateRequest = true;
for (auto it = requestUpdateWindows.constBegin(); it != requestUpdateWindows.constEnd(); ++it) {
auto *window = it.key();
UpdateRequestDeliveryType updateType = it.value();
deliverUpdateRequest(window, updateType);
}
m_inDeliverUpdateRequest = false;
frame(requestUpdateWindows.keys());
}
void QWasmCompositor::deliverUpdateRequest(QWasmWindow *window, UpdateRequestDeliveryType updateType)
{
QWindow *qwindow = window->window();
// Make sure the DPR value for the window is up to date on expose/repaint.
// FIXME: listen to native DPR change events instead, if/when available.
QWindowSystemInterface::handleWindowDevicePixelRatioChanged(qwindow);
// Update by deliverUpdateRequest and expose event according to requested update
// type. If the window has not yet been exposed then we must expose it first regardless
// of update type. The deliverUpdateRequest must still be sent in this case in order
// to maintain correct window update state.
QRect updateRect(QPoint(0, 0), qwindow->geometry().size());
if (updateType == UpdateRequestDelivery) {
if (qwindow->isExposed() == false)
QWindowSystemInterface::handleExposeEvent(qwindow, updateRect);
window->deliverUpdateRequest();
} else {
QWindowSystemInterface::handleExposeEvent(qwindow, updateRect);
}
}
void QWasmCompositor::handleBackingStoreFlush(QWindow *window)
{
// Request update to flush the updated backing store content, unless we are currently
// processing an update, in which case the new content will flushed as a part of that update.
if (!m_inDeliverUpdateRequest)
requestUpdateWindow(static_cast<QWasmWindow *>(window->handle()));
}
void QWasmCompositor::frame(const QList<QWasmWindow *> &windows)
{
if (!m_isEnabled || !screen())
return;
for (QWasmWindow *window : windows)
window->paint();
}
QWasmScreen *QWasmCompositor::screen()
{
return static_cast<QWasmScreen *>(parent());
}
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