/*

* Copyright (c) 2006 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:   Misc. utils

*

*/

//

// NOTE THAT THIS FILE IS ALMOST IDENTICAL WITH HUIUTIL.CPP !

//

// HuiUtil.h functions are not called from this file because we want alfclient.dll

// to not have unnecessary (any) static dependencies to core toolkit hitchcock.dll 

// (a.k.a huitk.dll, uiaccel.dll,...). There is no other reason to duplicate 

// this code.

//

#include "alf/alfutil.h"

#include "alf/alftimedvalue.h"

#include <e32math.h>

#include <hal.h>

#include <AknUtils.h>

const TReal32 KLengthUnitDivisor = 320.0;

/// Character used for separating tags in a tag descriptor.

const TInt KTagSeparator = ':';

// Calculates the smallest power-of-two that is equal to or greater than

// a value.

EXPORT_C TInt AlfUtil::Power2(TInt aValue)

    {

    ASSERT(aValue>0);

    if(aValue<=0)

        {

        return 0;

        }

    TInt i;

    for(i = 1; i < aValue && i < KMaxTInt/2; i *= 2)

        {}

    return i;

    }

EXPORT_C TInt AlfUtil::Power2RoundDown(TInt aValue)

    {

    ASSERT(aValue>0);

    if(aValue <= 0)

        {

        return 0;

        }

    TInt i = 1;

    for(; (i * 4 <= aValue) && (i < KMaxTInt/4); i *= 4)

        {}

    for(; (i * 2 <= aValue) && (i < KMaxTInt/2); i *= 2)

        {}

    return i;

    }

EXPORT_C TReal32 AlfUtil::Interpolate(TReal32 aPos, TReal32 aMin, TReal32 aMax) __SOFTFP

    {

    aPos = Max(0.f, aPos);

    aPos = Min(aPos, 1.f);

    return (1 - aPos) * aMin + aPos * aMax;

    }

EXPORT_C void AlfUtil::WrapValue(TReal32& aValue, TReal32 aLow, TReal32 aHigh) __SOFTFP

    {

    TReal32 segments = 0;

    TReal32 length = aHigh - aLow;

    if(length <= 0)

        {

        aValue = aLow;

        return;

        }

    if(aValue < aLow)

        {

        // Wrap from below.

        segments = (aLow - aValue) / length;

        aValue += (TInt(segments) + 1) * length;

        }

    else if(aValue >= aHigh)

        {

        // Wrap from above.

        segments = (aValue - aHigh) / length;

        aValue -= (TInt(segments) + 1) * length;

        }

    else

        {

        // for PC lint

        }

    }

EXPORT_C TInt AlfUtil::RandomInt(TInt aMin, TInt aMax)

    {

    TUint32 random = Math::Random();

    TUint range = aMax - aMin;

    if(range > 0)

        {

        return aMin + (random % (range + 1));

        }

    else

        {

        return aMin;

        }

    }

EXPORT_C TReal32 AlfUtil::RandomReal(TReal32 aMin, TReal32 aMax) __SOFTFP

    {

    /** @todo  Could use Math::FRand(). */

    TReal32 random = RandomInt(0, 10000000) / 10000000.0;

    return aMin + (aMax - aMin) * random;

    }

EXPORT_C TUint AlfUtil::FreeMemory(TUint* aTotalMemory)

    {

    TInt total = 0;

    TInt free = 0;

    HAL::Get(HALData::EMemoryRAM, total);

    HAL::Get(HALData::EMemoryRAMFree, free);

    if(aTotalMemory)

        {

        *aTotalMemory = total;

        }

    return free;

    }

EXPORT_C TSize AlfUtil::ScreenSize()

    {

    TSize screenSize(320, 240);

    AknLayoutUtils::LayoutMetricsSize(AknLayoutUtils::EScreen, screenSize);

    return screenSize;

    }

EXPORT_C CFont* AlfUtil::NearestFontInTwipsL(const TFontSpec& aFontSpec)

    {

    /// @todo  Accessing the screen device during a display resizing event may

    ///        result in a font that is suitable for the display size that

    ///        was in use prior to the resize. Probably we should use

    ///        AknLayoutUtils here.

    CFont* font = NULL;

    CWsScreenDevice* screenDev = CCoeEnv::Static()->ScreenDevice();

    User::LeaveIfError( screenDev->GetNearestFontInTwips(font, aFontSpec) );

    return font;

    }

EXPORT_C void AlfUtil::ReleaseFont(CFont* aFont)

    {

    CCoeEnv::Static()->ScreenDevice()->ReleaseFont(aFont);

    }

EXPORT_C TReal32 AlfUtil::LengthUnit() __SOFTFP

    {

    return Max(ScreenSize().iWidth, ScreenSize().iHeight) / KLengthUnitDivisor;

    }

EXPORT_C TReal32 AlfUtil::QuickLength(TAlfRealPoint& aVector) __SOFTFP

    {

    TReal32 dx = Abs(aVector.iX);

    TReal32 dy = Abs(aVector.iY);

    if(dx < dy)

        {

        return dx + dy - dx/2;

        }

    else

        {

        return dx + dy - dy/2;

        }

    }

EXPORT_C TReal32 AlfUtil::QuickLength(TReal32 aDx, TReal32 aDy) __SOFTFP

    {

    TReal32 dx = Abs(aDx);

    TReal32 dy = Abs(aDy);

    if(dx < dy)

        {

        return dx + dy - dx/2;

        }

    else

        {

        return dx + dy - dy/2;

        }

    }

EXPORT_C void AlfUtil::QuickNormalize(TAlfRealPoint& aNormal)

    {

    TReal32 approxLength = QuickLength(aNormal);

    if(approxLength > 0)

        {

        aNormal.iX /= approxLength;

        aNormal.iY /= approxLength;

        }

    }

EXPORT_C void AlfUtil::QuickNormalize(TReal32 aVector[3]) __SOFTFP

    {

    TReal32 approxLength = QuickLength(QuickLength(aVector[0], aVector[1]), aVector[2]);

    if(approxLength > 0)

        {

        aVector[0] /= approxLength;

        aVector[1] /= approxLength;

        aVector[2] /= approxLength;

        }

    }

EXPORT_C void AlfUtil::CrossProduct(const TReal32 aA[3], const TReal32 aB[3],

                                    TReal32 aProduct[3]) __SOFTFP

    {

    aProduct[0] = aA[1] * aB[2] - aB[1] * aA[2];

    aProduct[1] = aA[2] * aB[0] - aB[2] * aA[0];

    aProduct[2] = aA[0] * aB[1] - aB[0] * aA[1];

    }

EXPORT_C void AlfUtil::NormalFromPoints(const TReal32 aPoints[3][3], TReal32 aNormal[3]) __SOFTFP

    {

    TReal32 vectors[2][3];

    TInt i;

    for(i = 0; i < 3; ++i)

        {

        vectors[0][i] = aPoints[0][i] - aPoints[1][i];

        vectors[1][i] = aPoints[0][i] - aPoints[2][i];

        }

    CrossProduct(vectors[0], vectors[1], aNormal);

    QuickNormalize(aNormal);

    }

EXPORT_C void AlfUtil::ShadowMatrix(const TReal32 aPlanePoint[3],

                                    const TReal32 aPlaneNormal[3],

                                    const TReal32 aLightPos[4],

                                    TReal32 aDestMat[16]) __SOFTFP

    {

    TReal32 planeCoeff[4];

    TReal32 dot;

    // Find the plane equation coefficients

    // Find the first three coefficients the same way we find a normal.

    //NormalFromPoints(aPoints, planeCoeff);

    planeCoeff[0] = aPlaneNormal[0];

    planeCoeff[1] = aPlaneNormal[1];

    planeCoeff[2] = aPlaneNormal[2];

    // Find the last coefficient by back substitutions

    planeCoeff[3] = - ((planeCoeff[0] * aPlanePoint[0]) + (planeCoeff[1] * aPlanePoint[1]) +

                       (planeCoeff[2] * aPlanePoint[2]));

    // Dot product of plane and light position

    dot = planeCoeff[0] * aLightPos[0] + planeCoeff[1] * aLightPos[1] +

          planeCoeff[2] * aLightPos[2] + planeCoeff[3] * aLightPos[3];

    // Now do the projection

    // First column

    aDestMat[0] = dot - aLightPos[0] * planeCoeff[0];

    aDestMat[4] = 0.0f - aLightPos[0] * planeCoeff[1];

    aDestMat[8] = 0.0f - aLightPos[0] * planeCoeff[2];

    aDestMat[12] = 0.0f - aLightPos[0] * planeCoeff[3];

    // Second column

    aDestMat[1] = 0.0f - aLightPos[1] * planeCoeff[0];

    aDestMat[5] = dot - aLightPos[1] * planeCoeff[1];

    aDestMat[9] = 0.0f - aLightPos[1] * planeCoeff[2];

    aDestMat[13] = 0.0f - aLightPos[1] * planeCoeff[3];

    // Third Column

    aDestMat[2] = 0.0f - aLightPos[2] * planeCoeff[0];

    aDestMat[6] = 0.0f - aLightPos[2] * planeCoeff[1];

    aDestMat[10] = dot - aLightPos[2] * planeCoeff[2];

    aDestMat[14] = 0.0f - aLightPos[2] * planeCoeff[3];

    // Fourth Column

    aDestMat[3] = 0.0f - aLightPos[3] * planeCoeff[0];

    aDestMat[7] = 0.0f - aLightPos[3] * planeCoeff[1];

    aDestMat[11] = 0.0f - aLightPos[3] * planeCoeff[2];

    aDestMat[15] = dot - aLightPos[3] * planeCoeff[3];

    }

EXPORT_C TReal32 AlfUtil::ColorLightness(const TRgb& aColor) __SOFTFP

    {

    TReal32 red = aColor.Red() / 255.0f;

    TReal32 green = aColor.Red() / 255.0f;

    TReal32 blue = aColor.Red() / 255.0f;

    return (red*2 + green*3 + blue) / 6.f;

    }

EXPORT_C void AlfUtil::ScaleFbsBitmapL(const CFbsBitmap & aSrcBitmap,

                                       CFbsBitmap & aScaledBitmap)

    {

    CFbsDevice* targetdevice = NULL;

    CFbsBitGc* gc = NULL;

    // create device for drawing onto the target cropped bitmap area

    targetdevice = CFbsBitmapDevice::NewL(&aScaledBitmap);

    CleanupStack::PushL(targetdevice);

    // create graphics context for drawing

    User::LeaveIfError(targetdevice->CreateContext(gc));

    // Perform downscale using DrawBitmap

    gc->DrawBitmap(TRect(TPoint(0,0), aScaledBitmap.SizeInPixels()),

                   (const CFbsBitmap *)&aSrcBitmap);

    delete gc;

    CleanupStack::PopAndDestroy(targetdevice);

    }

EXPORT_C void AlfUtil::CombineMaskFbsBitmapL(const CFbsBitmap & aSrcBitmap,

                                             const CFbsBitmap & aSrcMaskBitmap,

                                             CFbsBitmap & aCombinedBitmap)

    {

    ASSERT(aCombinedBitmap.DisplayMode() == EColor16MA);

    ASSERT(aSrcMaskBitmap.DisplayMode() == EGray2 || aSrcMaskBitmap.DisplayMode() == EGray256 || aSrcMaskBitmap.DisplayMode() == EGray16 || aSrcMaskBitmap.DisplayMode() == EGray4);

    // Resize the target bitmap if needed

    if (aSrcBitmap.SizeInPixels() != aCombinedBitmap.SizeInPixels())

        {

        aCombinedBitmap.Resize(aSrcBitmap.SizeInPixels());

        }

    // Alternative method to blend manually (SLOW!!):

    // Apply the alpha mask.

    TBitmapUtil color((CFbsBitmap*)&aSrcBitmap);

    TBitmapUtil alpha((CFbsBitmap*)&aSrcMaskBitmap);

    TBitmapUtil target((CFbsBitmap*)&aCombinedBitmap);

    color.Begin(TPoint(0, 0));

    alpha.Begin(TPoint(0, 0));

    target.Begin(TPoint(0, 0));

    TSize size(aCombinedBitmap.SizeInPixels());

    for(TInt y = 0; y < size.iHeight; ++y)

        {

        alpha.SetPos(TPoint(0, y));

        color.SetPos(TPoint(0, y));

        target.SetPos(TPoint(0, y));

        for(TInt x = 0; x < size.iWidth; ++x)

            {

            target.SetPixel((color.GetPixel() & 0xffffff)

                          | ((alpha.GetPixel() & 0xff) << 24));

            target.IncXPos();

            color.IncXPos();

            alpha.IncXPos();

            }

        }

    target.End();

    color.End();

    alpha.End();

    }

EXPORT_C void AlfUtil::CropFbsBitmapL(const CFbsBitmap & aSrcBitmap,

                                    CFbsBitmap & aCroppedBitmap,

                                    TPoint aCropPosition)

    {

    CFbsDevice* targetdevice;

    CFbsBitGc* gc;

    // create device for drawing onto the target cropped bitmap area

    targetdevice = CFbsBitmapDevice::NewL(&aCroppedBitmap);

    CleanupStack::PushL(targetdevice);

    // create graphics context for drawing

    User::LeaveIfError(targetdevice->CreateContext(gc));

    // Perform cropping bitblit

    gc->BitBlt(TPoint(0,0), &aSrcBitmap,

               TRect(aCropPosition, aCroppedBitmap.SizeInPixels()));

    delete gc;

    CleanupStack::PopAndDestroy(targetdevice);

    }

EXPORT_C void AlfUtil::ScaleImage(TInt aComponents,

                                  const TSize& aSrcSize,

                                  const TUint8* aSrcBuffer,

                                  const TSize& aDestSize,

                                  TUint8* aDestBuffer)

    {

    // TODO: if there is actual use for this routine,

    // there might be better minification filters than bilinear...

    // anyway, now this routine produced acceptable results

    // when magnifying also...

    ASSERT (aDestBuffer && aSrcBuffer);

    ASSERT (aSrcSize.iWidth > 0 && aSrcSize.iHeight > 0);

    ASSERT (aDestSize.iWidth > 0 && aDestSize.iHeight > 0);

    ASSERT (aComponents > 0 && aComponents < 5);

    TUint32 xScale = ((aSrcSize.iWidth-1) << 16) / aDestSize.iWidth;

    TUint32 yScale = ((aSrcSize.iHeight-1) << 16) / aDestSize.iHeight;

    TUint32 height = aDestSize.iHeight;

    TUint8* srcptr = const_cast<TUint8*>(aSrcBuffer);

    TUint8* destPtrLimit = aDestBuffer+(aDestSize.iWidth*aComponents);

    TUint32 y = yScale&0xffff;

    do 

        {

        TUint32 fV = y&0xffff;

        TUint32 x = xScale&0xffff;

        while(aDestBuffer < destPtrLimit)

            {

            TUint32 fU = x&0xffff;

            for (TInt components = 0; components < aComponents; components++)

                {

                TUint32 componenta = srcptr[((x>>16)*aComponents)+components];

                TUint32 componentb = srcptr[((x>>16)*aComponents)+aComponents+components];

                TUint32 componentc = srcptr[((x>>16)*aComponents)+(aSrcSize.iWidth*aComponents)+components];

                TUint32 componentd = srcptr[((x>>16)*aComponents)+(aSrcSize.iWidth*aComponents)+aComponents+components];

                TUint32 componentf1 = (componenta+(((fU*((componentb-componenta)))>>16))) & 0xff;

                TUint32 componentf2 = (componentc+(((fU*((componentd-componentc)))>>16))) & 0xff;

                TUint32 finalcomponent = (componentf1+(((fV*((componentf2-componentf1)))>>16))) & 0xff;

                *aDestBuffer++ = (TUint8)finalcomponent;

                }

            x+=xScale;

            }

        y+=yScale;

        srcptr = const_cast<TUint8*>(aSrcBuffer)+((y>>16)*(aSrcSize.iWidth*aComponents));

        destPtrLimit+=aDestSize.iWidth*aComponents;

        }

    while (--height);

    }

EXPORT_C void AlfUtil::CropImage(TInt aComponents,

                                const TSize& aSrcBufferSize,

                                const TUint8* aSrcBuffer,

                                const TPoint& aCropOffset,

                                const TSize& aCroppedSize,

                                TUint8* aDestBuffer)

    {

    ASSERT (aDestBuffer && aSrcBuffer);

    ASSERT (aSrcBufferSize.iWidth > 0 && aSrcBufferSize.iHeight > 0);

    ASSERT (aCroppedSize.iWidth > 0 && aCroppedSize.iHeight > 0);

    ASSERT (aCropOffset.iX < aSrcBufferSize.iWidth);

    ASSERT (aCropOffset.iY < aSrcBufferSize.iHeight);

    ASSERT (aComponents > 0 && aComponents < 5);

    TInt targetlinesize = aCroppedSize.iWidth*aComponents;

    TInt sourcelinesize = aSrcBufferSize.iWidth*aComponents;

    for (TInt y=0; y<aCroppedSize.iHeight; y++)

        {

        // copy line at a time..

        TAny * source = (TAny*)((const TUint8*)aSrcBuffer

                            + ((y+aCropOffset.iY)*sourcelinesize)

                            + (aCropOffset.iX * aComponents));

        TAny * target = (TAny*)((const TUint8*)aDestBuffer + (y*targetlinesize));

        memcpy(target, source, targetlinesize);

        }

    }

EXPORT_C CFbsBitmap* AlfUtil::ConvertBitmapToDisplayModeLC( const CFbsBitmap& aBitmap, const TDisplayMode& aDisplaymode )

    {

    // Create target bitmap

    CFbsBitmap* targetBitmap = new CFbsBitmap();

    CleanupStack::PushL( targetBitmap );

    targetBitmap->Create( aBitmap.SizeInPixels(), aDisplaymode );

    // Create bitmap device for target rendering

    CFbsBitmapDevice* targetDevice = CFbsBitmapDevice::NewL( targetBitmap );

    CleanupStack::PushL( targetDevice );

    // Create bitmap graphics context

    CFbsBitGc* bitgc = CFbsBitGc::NewL();

    CleanupStack::PushL( bitgc );

    bitgc->Activate( targetDevice );

    // BitBlt the given bitmap to target device.

    bitgc->BitBlt( TPoint( 0, 0 ), &aBitmap );

    CleanupStack::PopAndDestroy( bitgc );

    CleanupStack::PopAndDestroy( targetDevice );

    return targetBitmap;

    }

EXPORT_C TBool AlfUtil::TagMatches(const TDesC8& aTagsColonSeparated, const TDesC8& aTag)

    {

    TPtrC8 region = aTagsColonSeparated;

    TPtrC8 tag;

    TInt index = 0;

    if(!aTag.Length())

        {

        // No tag specified; doesn't match anything.

        return EFalse;

        }

    while(region.Length() > 0)

        {

        // Is there a colon in the region?

        index = region.Locate(TChar(KTagSeparator));

        if(index != KErrNotFound)

            {

            // A separator exists in the region.

            tag.Set(region.Left(index));

            region.Set(region.Right(region.Length() - index - 1));

            }