/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

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** GNU Lesser General Public License Usage

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** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

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** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

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** If you have questions regarding the use of this file, please contact

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** $QT_END_LICENSE$

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****************************************************************************/

#include <private/qt_mac_p.h>

#include "qcoreapplication.h"

#include <qlibrary.h>

QT_BEGIN_NAMESPACE

QRegion::QRegionData QRegion::shared_empty = { Q_BASIC_ATOMIC_INITIALIZER(1), 0 };

#if defined(Q_WS_MAC32) && !defined(QT_MAC_USE_COCOA)

#define RGN_CACHE_SIZE 200

#ifdef RGN_CACHE_SIZE

static bool rgncache_init = false;

static int rgncache_used;

static RgnHandle rgncache[RGN_CACHE_SIZE];

static void qt_mac_cleanup_rgncache()

{

    rgncache_init = false;

    for(int i = 0; i < RGN_CACHE_SIZE; ++i) {

        if(rgncache[i]) {

            --rgncache_used;

            DisposeRgn(rgncache[i]);

            rgncache[i] = 0;

        }

    }

}

#endif

Q_GUI_EXPORT RgnHandle qt_mac_get_rgn()

{

#ifdef RGN_CACHE_SIZE

    if(!rgncache_init) {

        rgncache_used = 0;

        rgncache_init = true;

        for(int i = 0; i < RGN_CACHE_SIZE; ++i)

            rgncache[i] = 0;

        qAddPostRoutine(qt_mac_cleanup_rgncache);

    } else if(rgncache_used) {

        for(int i = 0; i < RGN_CACHE_SIZE; ++i) {

            if(rgncache[i]) {

                RgnHandle ret = rgncache[i];

                SetEmptyRgn(ret);

                rgncache[i] = 0;

                --rgncache_used;

                return ret;

            }

        }

    }

#endif

    return NewRgn();

}

Q_GUI_EXPORT void qt_mac_dispose_rgn(RgnHandle r)

{

#ifdef RGN_CACHE_SIZE

    if(rgncache_init && rgncache_used < RGN_CACHE_SIZE) {

        for(int i = 0; i < RGN_CACHE_SIZE; ++i) {

            if(!rgncache[i]) {

                ++rgncache_used;

                rgncache[i] = r;

                return;

            }

        }

    }

#endif

    DisposeRgn(r);

}

static OSStatus qt_mac_get_rgn_rect(UInt16 msg, RgnHandle, const Rect *rect, void *reg)

{

    if(msg == kQDRegionToRectsMsgParse) {

        QRect rct(rect->left, rect->top, (rect->right - rect->left), (rect->bottom - rect->top));

        if(!rct.isEmpty())

            *((QRegion *)reg) += rct;

    }

    return noErr;

}

Q_GUI_EXPORT QRegion qt_mac_convert_mac_region(RgnHandle rgn)

{

    return QRegion::fromQDRgn(rgn);

}

QRegion QRegion::fromQDRgn(RgnHandle rgn)

{

    QRegion ret;

    ret.detach();

    OSStatus oss = QDRegionToRects(rgn, kQDParseRegionFromTopLeft, qt_mac_get_rgn_rect, (void *)&ret);

    if(oss != noErr)

        return QRegion();

    return ret;

}

/*!

    \internal

     Create's a RegionHandle, it's the caller's responsibility to release.

*/

RgnHandle QRegion::toQDRgn() const

{

    RgnHandle rgnHandle = qt_mac_get_rgn();

    if(d->qt_rgn && d->qt_rgn->numRects) {

        RgnHandle tmp_rgn = qt_mac_get_rgn();

        int n = d->qt_rgn->numRects;

        const QRect *qt_r = (n == 1) ? &d->qt_rgn->extents : d->qt_rgn->rects.constData();

        while (n--) {

            SetRectRgn(tmp_rgn,

                       qMax(SHRT_MIN, qt_r->x()),

                       qMax(SHRT_MIN, qt_r->y()),

                       qMin(SHRT_MAX, qt_r->right() + 1),

                       qMin(SHRT_MAX, qt_r->bottom() + 1));

            UnionRgn(rgnHandle, tmp_rgn, rgnHandle);

            ++qt_r;

        }

        qt_mac_dispose_rgn(tmp_rgn);

    }

    return rgnHandle;

}

/*!

    \internal

     Create's a RegionHandle, it's the caller's responsibility to release.

     Returns 0 if the QRegion overflows.

*/

RgnHandle QRegion::toQDRgnForUpdate_sys() const

{

    RgnHandle rgnHandle = qt_mac_get_rgn();

    if(d->qt_rgn && d->qt_rgn->numRects) {

        RgnHandle tmp_rgn = qt_mac_get_rgn();

        int n = d->qt_rgn->numRects;

        const QRect *qt_r = (n == 1) ? &d->qt_rgn->extents : d->qt_rgn->rects.constData();

        while (n--) {

            // detect overflow. Tested for use with HIViewSetNeedsDisplayInRegion

            // in QWidgetPrivate::update_sys().

            enum { HIViewSetNeedsDisplayInRegionOverflow = 10000 }; // empirically determined conservative value

            if (qt_r->right() > HIViewSetNeedsDisplayInRegionOverflow || qt_r->bottom() > HIViewSetNeedsDisplayInRegionOverflow) {

                qt_mac_dispose_rgn(tmp_rgn);

                qt_mac_dispose_rgn(rgnHandle);

                return 0;

            }

            SetRectRgn(tmp_rgn,

                       qMax(SHRT_MIN, qt_r->x()),

                       qMax(SHRT_MIN, qt_r->y()),

                       qMin(SHRT_MAX, qt_r->right() + 1),

                       qMin(SHRT_MAX, qt_r->bottom() + 1));

            UnionRgn(rgnHandle, tmp_rgn, rgnHandle);

            ++qt_r;

        }

        qt_mac_dispose_rgn(tmp_rgn);

    }

    return rgnHandle;

}

#endif

#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)

OSStatus QRegion::shape2QRegionHelper(int inMessage, HIShapeRef,

                                      const CGRect *inRect, void *inRefcon)

{

    QRegion *region = static_cast<QRegion *>(inRefcon);

    if (!region)

        return paramErr;

    switch (inMessage) {

    case kHIShapeEnumerateRect:

        *region += QRect(inRect->origin.x, inRect->origin.y,

                         inRect->size.width, inRect->size.height);

        break;

    case kHIShapeEnumerateInit:

        // Assume the region is already setup correctly

    case kHIShapeEnumerateTerminate:

    default:

        break;

    }

    return noErr;

}

#endif

/*!

    \internal

     Create's a mutable shape, it's the caller's responsibility to release.

     WARNING: this function clamps the coordinates to SHRT_MIN/MAX on 10.4 and below.

*/

HIMutableShapeRef QRegion::toHIMutableShape() const

{

    HIMutableShapeRef shape = HIShapeCreateMutable();

#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)

    if (QSysInfo::MacintoshVersion >= QSysInfo::MV_10_5) {

        if (d->qt_rgn && d->qt_rgn->numRects) {

            int n = d->qt_rgn->numRects;

            const QRect *qt_r = (n == 1) ? &d->qt_rgn->extents : d->qt_rgn->rects.constData();

            while (n--) {

                CGRect cgRect = CGRectMake(qt_r->x(), qt_r->y(), qt_r->width(), qt_r->height());

                HIShapeUnionWithRect(shape, &cgRect);

                ++qt_r;

            }

        }

    } else

#endif

    {

#ifndef QT_MAC_USE_COCOA

        QCFType<HIShapeRef> qdShape = HIShapeCreateWithQDRgn(QMacSmartQuickDrawRegion(toQDRgn()));

        HIShapeUnion(qdShape, shape, shape);

#endif

    }

    return shape;

}

#if !defined(Q_WS_MAC64) && !defined(QT_MAC_USE_COCOA)

typedef OSStatus (*PtrHIShapeGetAsQDRgn)(HIShapeRef, RgnHandle);

static PtrHIShapeGetAsQDRgn ptrHIShapeGetAsQDRgn = 0;

#endif

QRegion QRegion::fromHIShapeRef(HIShapeRef shape)

{

    QRegion returnRegion;

    returnRegion.detach();

    // Begin gratuitous #if-defery

#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)

# ifndef Q_WS_MAC64

    if (QSysInfo::MacintoshVersion >= QSysInfo::MV_10_5) {

# endif

        HIShapeEnumerate(shape, kHIShapeParseFromTopLeft, shape2QRegionHelper, &returnRegion);

# ifndef Q_WS_MAC64

    } else

# endif

#endif

    {

#if !defined(Q_WS_MAC64) && !defined(QT_MAC_USE_COCOA)

        if (ptrHIShapeGetAsQDRgn == 0) {

            QLibrary library(QLatin1String("/System/Library/Frameworks/Carbon.framework/Carbon"));

            library.setLoadHints(QLibrary::ExportExternalSymbolsHint);

                    ptrHIShapeGetAsQDRgn = reinterpret_cast<PtrHIShapeGetAsQDRgn>(library.resolve("HIShapeGetAsQDRgn"));

        }

        RgnHandle rgn = qt_mac_get_rgn();

        ptrHIShapeGetAsQDRgn(shape, rgn);

        returnRegion = QRegion::fromQDRgn(rgn);

        qt_mac_dispose_rgn(rgn);

#endif

    }

    return returnRegion;

}

QT_END_NAMESPACE