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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qwasmscreen.h"
#include "qwasmwindow.h"
#include "qwasmeventtranslator.h"
#include "qwasmcompositor.h"
#include "qwasmintegration.h"
#include "qwasmstring.h"
#include <emscripten/bind.h>
#include <emscripten/val.h>
#include <QtGui/private/qeglconvenience_p.h>
#ifndef QT_NO_OPENGL
# include <QtGui/private/qeglplatformcontext_p.h>
#endif
#include <qpa/qwindowsysteminterface.h>
#include <QtCore/qcoreapplication.h>
#include <QtGui/qguiapplication.h>
#include <private/qhighdpiscaling_p.h>
using namespace emscripten;
QT_BEGIN_NAMESPACE
QWasmScreen::QWasmScreen(const emscripten::val &canvas)
: m_canvas(canvas)
{
m_compositor = new QWasmCompositor(this);
m_eventTranslator = new QWasmEventTranslator(this);
updateQScreenAndCanvasRenderSize();
m_canvas.call<void>("focus");
}
QWasmScreen::~QWasmScreen()
{
destroy();
}
void QWasmScreen::destroy()
{
m_compositor->destroy();
}
QWasmScreen *QWasmScreen::get(QPlatformScreen *screen)
{
return static_cast<QWasmScreen *>(screen);
}
QWasmScreen *QWasmScreen::get(QScreen *screen)
{
return get(screen->handle());
}
QWasmCompositor *QWasmScreen::compositor()
{
return m_compositor;
}
QWasmEventTranslator *QWasmScreen::eventTranslator()
{
return m_eventTranslator;
}
emscripten::val QWasmScreen::canvas() const
{
return m_canvas;
}
QString QWasmScreen::canvasId() const
{
return QWasmString::toQString(m_canvas["id"]);
}
QRect QWasmScreen::geometry() const
{
return m_geometry;
}
int QWasmScreen::depth() const
{
return m_depth;
}
QImage::Format QWasmScreen::format() const
{
return m_format;
}
QDpi QWasmScreen::logicalDpi() const
{
emscripten::val dpi = emscripten::val::module_property("qtFontDpi");
if (!dpi.isUndefined()) {
qreal dpiValue = dpi.as<qreal>();
return QDpi(dpiValue, dpiValue);
}
const qreal defaultDpi = 96;
return QDpi(defaultDpi, defaultDpi);
}
qreal QWasmScreen::devicePixelRatio() const
{
// window.devicePixelRatio gives us the scale factor between CSS and device pixels.
// This property reflects hardware configuration, and also browser zoom on desktop.
//
// window.visualViewport.scale gives us the zoom factor on mobile. If the html page is
// configured with "<meta name="viewport" content="width=device-width">" then this scale
// factor will be 1. Omitting the viewport configuration typically results on a zoomed-out
// viewport, with a scale factor <1. User pinch-zoom will change the scale factor; an event
// handler is installed in the QWasmIntegration constructor. Changing zoom level on desktop
// does not appear to change visualViewport.scale.
//
// The effective devicePixelRatio is the product of these two scale factors, upper-bounded
// by window.devicePixelRatio in order to avoid e.g. allocating a 10x widget backing store.
double dpr = emscripten::val::global("window")["devicePixelRatio"].as<double>();
emscripten::val visualViewport = emscripten::val::global("window")["visualViewport"];
double scale = visualViewport.isUndefined() ? 1.0 : visualViewport["scale"].as<double>();
double effectiveDevicePixelRatio = std::min(dpr * scale, dpr);
return qreal(effectiveDevicePixelRatio);
}
QString QWasmScreen::name() const
{
return canvasId();
}
QPlatformCursor *QWasmScreen::cursor() const
{
return const_cast<QWasmCursor *>(&m_cursor);
}
void QWasmScreen::resizeMaximizedWindows()
{
if (!screen())
return;
QPlatformScreen::resizeMaximizedWindows();
}
QWindow *QWasmScreen::topWindow() const
{
return m_compositor->keyWindow();
}
QWindow *QWasmScreen::topLevelAt(const QPoint &p) const
{
return m_compositor->windowAt(p);
}
void QWasmScreen::invalidateSize()
{
m_geometry = QRect();
}
void QWasmScreen::setGeometry(const QRect &rect)
{
m_geometry = rect;
QWindowSystemInterface::handleScreenGeometryChange(QPlatformScreen::screen(), geometry(), availableGeometry());
resizeMaximizedWindows();
}
void QWasmScreen::updateQScreenAndCanvasRenderSize()
{
// The HTML canvas has two sizes: the CSS size and the canvas render size.
// The CSS size is determined according to standard CSS rules, while the
// render size is set using the "width" and "height" attributes. The render
// size must be set manually and is not auto-updated on CSS size change.
// Setting the render size to a value larger than the CSS size enables high-dpi
// rendering.
QByteArray canvasSelector = "#" + canvasId().toUtf8();
double css_width;
double css_height;
emscripten_get_element_css_size(canvasSelector.constData(), &css_width, &css_height);
QSizeF cssSize(css_width, css_height);
QSizeF canvasSize = cssSize * devicePixelRatio();
m_canvas.set("width", canvasSize.width());
m_canvas.set("height", canvasSize.height());
QPoint offset;
offset.setX(m_canvas["offsetTop"].as<int>());
offset.setY(m_canvas["offsetLeft"].as<int>());
emscripten::val rect = m_canvas.call<emscripten::val>("getBoundingClientRect");
QPoint position(rect["left"].as<int>() - offset.x(), rect["top"].as<int>() - offset.y());
setGeometry(QRect(position, cssSize.toSize()));
m_compositor->redrawWindowContent();
}
QT_END_NAMESPACE
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