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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "qwasmbackingstore.h"
#include "qwasmwindow.h"
#include "qwasmcompositor.h"
#include "qwasmdom.h"
#include <QtGui/qpainter.h>
#include <QtGui/qbackingstore.h>
#include <emscripten.h>
#include <emscripten/wire.h>
QT_BEGIN_NAMESPACE
QWasmBackingStore::QWasmBackingStore(QWasmCompositor *compositor, QWindow *window)
: QPlatformBackingStore(window), m_compositor(compositor)
{
QWasmWindow *wasmWindow = static_cast<QWasmWindow *>(window->handle());
if (wasmWindow)
wasmWindow->setBackingStore(this);
}
QWasmBackingStore::~QWasmBackingStore()
{
auto window = this->window();
QWasmIntegration::get()->removeBackingStore(window);
QWasmWindow *wasmWindow = static_cast<QWasmWindow *>(window->handle());
if (wasmWindow)
wasmWindow->setBackingStore(nullptr);
}
QPaintDevice *QWasmBackingStore::paintDevice()
{
return &m_image;
}
void QWasmBackingStore::flush(QWindow *window, const QRegion ®ion, const QPoint &offset)
{
Q_UNUSED(window);
Q_UNUSED(region);
Q_UNUSED(offset);
m_dirty |= region;
m_compositor->handleBackingStoreFlush(window);
}
void QWasmBackingStore::updateTexture(QWasmWindow *window)
{
if (m_dirty.isNull())
return;
if (m_webImageDataArray.isUndefined()) {
m_webImageDataArray = window->context2d().call<emscripten::val>(
"createImageData", emscripten::val(m_image.width()),
emscripten::val(m_image.height()));
}
QRegion clippedDpiScaledRegion;
QRect imageRect = m_image.rect();
for (const QRect &rect : m_dirty) {
// Convert device-independent dirty region to device region
qreal dpr = m_image.devicePixelRatio();
QRect deviceRect = QRect(rect.topLeft() * dpr, rect.size() * dpr);
// intersect with image rect to be sure
QRect r = imageRect & deviceRect;
// if the rect is wide enough it is cheaper to just extend it instead of doing an image copy
if (r.width() >= imageRect.width() / 2) {
r.setX(0);
r.setWidth(imageRect.width());
}
clippedDpiScaledRegion |= r;
}
for (const QRect &dirtyRect : clippedDpiScaledRegion)
dom::drawImageToWebImageDataArray(m_image, m_webImageDataArray, dirtyRect);
m_dirty = QRegion();
}
void QWasmBackingStore::beginPaint(const QRegion ®ion)
{
m_dirty |= region;
// Keep backing store device pixel ratio in sync with window
if (m_image.devicePixelRatio() != window()->handle()->devicePixelRatio())
resize(backingStore()->size(), backingStore()->staticContents());
QPainter painter(&m_image);
if (m_image.hasAlphaChannel()) {
painter.setCompositionMode(QPainter::CompositionMode_Source);
const QColor blank = Qt::transparent;
for (const QRect &rect : region)
painter.fillRect(rect, blank);
}
}
void QWasmBackingStore::resize(const QSize &size, const QRegion &staticContents)
{
Q_UNUSED(staticContents);
QImage::Format format = QImage::Format_RGBA8888;
const auto platformScreenDPR = window()->handle()->devicePixelRatio();
m_image = QImage(size * platformScreenDPR, format);
m_image.setDevicePixelRatio(platformScreenDPR);
m_webImageDataArray = emscripten::val::undefined();
}
QImage QWasmBackingStore::toImage() const
{
// used by QPlatformBackingStore::rhiFlush
return m_image;
}
const QImage &QWasmBackingStore::getImageRef() const
{
return m_image;
}
emscripten::val QWasmBackingStore::getUpdatedWebImage(QWasmWindow *window)
{
updateTexture(window);
return m_webImageDataArray;
}
QT_END_NAMESPACE
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