/*

* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

#include "lcdtransform.h"

EXPORT_C TPoint TLcdTransform::operator()(const TPoint& aPoint) const

{

    return TPoint

           (

               aPoint.iX*iDuDx + aPoint.iY*iDuDy + iU0,

               aPoint.iX*iDvDx + aPoint.iY*iDvDy + iV0

           );

}

EXPORT_C TLcdTransform TLcdTransform::operator *(const TLcdTransform& aT) const

{

    TLcdTransform t;

    t.iDuDx = iDuDx*aT.iDuDx + iDuDy*aT.iDvDx;

    t.iDuDy = iDuDx*aT.iDuDy + iDuDy*aT.iDvDy;

    t.iDvDx = iDvDx*aT.iDuDx + iDvDy*aT.iDvDx;

    t.iDvDy = iDvDx*aT.iDuDy + iDvDy*aT.iDvDy;

    t.iU0   = iDuDx*aT.iU0   + iDuDy*aT.iV0 + iU0;

    t.iV0   = iDvDx*aT.iU0   + iDvDy*aT.iV0 + iV0;

    ASSERT(Abs(t.iDuDx) <= 1);

    ASSERT(Abs(t.iDuDy) <= 1);

    ASSERT(Abs(t.iDvDx) <= 1);

    ASSERT(Abs(t.iDvDy) <= 1);

    ASSERT(Abs(t.iDuDx*t.iDvDy - t.iDuDy*t.iDvDx) == 1);

    return t;

}

EXPORT_C TBool TLcdTransform::operator == (const TLcdTransform& aT) const

{

    return (iDuDx == aT.iDuDx) &&

           (iDuDy == aT.iDuDy) &&

           (iDvDx == aT.iDvDx) &&

           (iDvDy == aT.iDvDy) &&

           (iU0   == aT.iU0) &&

           (iV0   == aT.iV0)  ;

}

EXPORT_C TLcdTransform TLcdTransform::Inverse() const

{

    TLcdTransform t;

    TInt det = iDuDx*iDvDy - iDuDy*iDvDx;

    ASSERT(Abs(det) == 1);

    TInt a = iDuDx;

    TInt b = iDuDy;

    TInt c = iDvDx;

    TInt d = iDvDy;

    TInt u = iU0;

    TInt v = iV0;

    t.iDuDx = d * det;

    t.iDuDy = - b * det;

    t.iDvDx = - c * det;

    t.iDvDy = a * det;

    t.iU0 = (b * v - d * u) * det;

    t.iV0 = (c * u - a * v) * det;

    return t;

}

EXPORT_C TLcdTransform Transform(TTransformType aType, const TSize& aSize)

{

    TLcdTransform t = TLcdTransform();

    switch (aType)

    {

    case ETransNone:

    {

        t.iDuDx = 1;

        t.iDvDx = 0;

        t.iDuDy = 0;

        t.iDvDy = 1;

        t.iU0   = 0;

        t.iV0   = 0;

    }

    break;

    case ETransMirrorRot180:    // EReflectVert

    {

        t.iDuDx = 1;

        t.iDvDx = 0;

        t.iDuDy = 0;

        t.iDvDy = -1;

        t.iU0   = 0;

        t.iV0   = aSize.iHeight - 1;

    }

    break;

    case ETransMirror:          // EReflectHorz

    {

        t.iDuDx = -1;

        t.iDvDx = 0;

        t.iDuDy = 0;

        t.iDvDy = 1;

        t.iU0   = aSize.iWidth - 1;

        t.iV0   = 0;

    }

    break;

    case ETransRot180:          // EReflectVert|EReflectHorz

    {

        t.iDuDx = -1;

        t.iDvDx = 0;

        t.iDuDy = 0;

        t.iDvDy = -1;

        t.iU0 = aSize.iWidth - 1;

        t.iV0 = aSize.iHeight - 1;

    }

    break;

    case ETransMirrorRot270:    // EReflectDiag

    {

        t.iDuDx = 0;

        t.iDvDx = 1;

        t.iDuDy = 1;

        t.iDvDy = 0;

        t.iU0   = 0;

        t.iV0   = 0;

    }

    break;

    case ETransRot90:           // EReflectVert|EReflectDiag

    {

        t.iDuDx = 0;

        t.iDvDx = 1;

        t.iDuDy = -1;

        t.iDvDy = 0;

        t.iU0   = aSize.iHeight-1;

        t.iV0   = 0;

    }

    break;

    case ETransRot270:          // EReflectHorz|EReflectDiag

    {

        t.iDuDx = 0;

        t.iDvDx = -1;

        t.iDuDy = 1;

        t.iDvDy = 0;

        t.iU0   = 0;

        t.iV0   = aSize.iWidth - 1;

    }

    break;

    case ETransMirrorRot90:     // EReflectVert|EReflectHorz|EReflectDiag

    {

        t.iDuDx = 0;

        t.iDvDx = -1;

        t.iDuDy = -1;

        t.iDvDy = 0;

        t.iU0 = aSize.iHeight - 1;

        t.iV0 = aSize.iWidth  - 1;

    }

    break;

    default:

        ASSERT(aType != aType);     // unknown type.

        break;

    }

    return t;

}

EXPORT_C TLcdTransform Identity()

{

    TLcdTransform t;

    t.iDuDx = 1;

    t.iDuDy = 0;

    t.iDvDx = 0;

    t.iDvDy = 1;

    t.iU0   = 0;

    t.iV0   = 0;

    return t;

}

/**

 * Compose the vertical reflection.

 *

 * Maps from source (image) coords to destination (graphics) coords.

 */

EXPORT_C TLcdTransform ReflectVert(const TSize& aSize)

{

    return Transform((TTransformType)EReflectVert, aSize);

}

/**

 * Compose the horizontal reflection.

 *

 * Maps from source (image) coords to destination (graphics) coords.

 */

EXPORT_C TLcdTransform ReflectHorz(const TSize& aSize)

{

    return Transform((TTransformType)EReflectHorz, aSize);

}

/**

 * Compose the diagonal reflection.

 *

 * Maps from source (image) coords to destination (graphics) coords.

 */

EXPORT_C TLcdTransform ReflectDiag()

{

    return Transform((TTransformType)EReflectDiag, TSize(0,0));

}

/**

 * Compose translation.

 *

 * Maps from source (image) coords to destination (graphics) coords.

 *

 */

EXPORT_C TLcdTransform Translate(const TPoint& aPoint)

{

    TLcdTransform t;

    t.iDuDx = 1;

    t.iDuDy = 0;

    t.iDvDx = 0;

    t.iDvDy = 1;

    t.iU0   = aPoint.iX;

    t.iV0   = aPoint.iY;

    return t;

}