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** This file is part of the plugins of the Qt Toolkit.
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****************************************************************************/

#include "qminimalintegration.h"
#include "qminimalbackingstore.h"

#include <QtGui/private/qpixmap_raster_p.h>
#include <QtGui/private/qguiapplication_p.h>
#include <qpa/qplatformwindow.h>

#include <QtFontDatabaseSupport/private/qfreetypefontdatabase_p.h>
#if defined(Q_OS_WINRT)
#  include <QtFontDatabaseSupport/private/qwinrtfontdatabase_p.h>
#elif defined(Q_OS_WIN)
#  include <QtFontDatabaseSupport/private/qwindowsfontdatabase_p.h>
#  if QT_CONFIG(freetype)
#    include <QtFontDatabaseSupport/private/qwindowsfontdatabase_ft_p.h>
#  endif
#elif defined(Q_OS_DARWIN)
#  include <QtFontDatabaseSupport/private/qcoretextfontdatabase_p.h>
#elif QT_CONFIG(fontconfig)
#  include <QtFontDatabaseSupport/private/qgenericunixfontdatabase_p.h>
#  include <qpa/qplatformfontdatabase.h>
#endif

#if !defined(Q_OS_WIN)
#include <QtEventDispatcherSupport/private/qgenericunixeventdispatcher_p.h>
#elif defined(Q_OS_WINRT)
#include <QtCore/private/qeventdispatcher_winrt_p.h>
#else
#include <QtCore/private/qeventdispatcher_win_p.h>
#endif

QT_BEGIN_NAMESPACE

class QCoreTextFontEngine;

static const char debugBackingStoreEnvironmentVariable[] = "QT_DEBUG_BACKINGSTORE";

static inline unsigned parseOptions(const QStringList &paramList)
{
    unsigned options = 0;
    for (const QString &param : paramList) {
        if (param == QLatin1String("enable_fonts"))
            options |= QMinimalIntegration::EnableFonts;
        else if (param == QLatin1String("freetype"))
            options |= QMinimalIntegration::FreeTypeFontDatabase;
    }
    return options;
}

QMinimalIntegration::QMinimalIntegration(const QStringList &parameters)
    : m_fontDatabase(0)
    , m_options(parseOptions(parameters))
{
    if (qEnvironmentVariableIsSet(debugBackingStoreEnvironmentVariable)
        && qEnvironmentVariableIntValue(debugBackingStoreEnvironmentVariable) > 0) {
        m_options |= DebugBackingStore | EnableFonts;
    }

    QMinimalScreen *mPrimaryScreen = new QMinimalScreen();

    mPrimaryScreen->mGeometry = QRect(0, 0, 240, 320);
    mPrimaryScreen->mDepth = 32;
    mPrimaryScreen->mFormat = QImage::Format_ARGB32_Premultiplied;

    screenAdded(mPrimaryScreen);
}

QMinimalIntegration::~QMinimalIntegration()
{
    delete m_fontDatabase;
}

bool QMinimalIntegration::hasCapability(QPlatformIntegration::Capability cap) const
{
    switch (cap) {
    case ThreadedPixmaps: return true;
    case MultipleWindows: return true;
    default: return QPlatformIntegration::hasCapability(cap);
    }
}

// Dummy font database that does not scan the fonts directory to be
// used for command line tools like qmlplugindump that do not create windows
// unless DebugBackingStore is activated.
class DummyFontDatabase : public QPlatformFontDatabase
{
public:
    virtual void populateFontDatabase() Q_DECL_OVERRIDE {}
};

QPlatformFontDatabase *QMinimalIntegration::fontDatabase() const
{
    if (!m_fontDatabase && (m_options & EnableFonts)) {
#if QT_CONFIG(fontconfig)
        m_fontDatabase = new QGenericUnixFontDatabase;
#elif defined(Q_OS_WINRT)
        m_fontDatabase = new QWinRTFontDatabase;
#elif defined(Q_OS_WIN)
        if (m_options & FreeTypeFontDatabase) {
#  if QT_CONFIG(freetype)
            m_fontDatabase = new QWindowsFontDatabaseFT;
#  endif // freetype
        } else {
            m_fontDatabase = new QWindowsFontDatabase;
        }
#elif defined(Q_OS_DARWIN)
        m_fontDatabase = new QCoreTextFontDatabaseEngineFactory<QCoreTextFontEngine>;
#else
        m_fontDatabase = QPlatformIntegration::fontDatabase();
#endif
    }
    if (!m_fontDatabase)
        m_fontDatabase = new DummyFontDatabase;
    return m_fontDatabase;
}

QPlatformWindow *QMinimalIntegration::createPlatformWindow(QWindow *window) const
{
    Q_UNUSED(window);
    QPlatformWindow *w = new QPlatformWindow(window);
    w->requestActivateWindow();
    return w;
}

QPlatformBackingStore *QMinimalIntegration::createPlatformBackingStore(QWindow *window) const
{
    return new QMinimalBackingStore(window);
}

QAbstractEventDispatcher *QMinimalIntegration::createEventDispatcher() const
{
#ifdef Q_OS_WIN
#ifndef Q_OS_WINRT
    return new QEventDispatcherWin32;
#else // !Q_OS_WINRT
    return new QEventDispatcherWinRT;
#endif // Q_OS_WINRT
#else
    return createUnixEventDispatcher();
#endif
}

QMinimalIntegration *QMinimalIntegration::instance()
{
    return static_cast<QMinimalIntegration *>(QGuiApplicationPrivate::platformIntegration());
}

QT_END_NAMESPACE