/*

* Copyright (c) 2009 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:     

*

*/

#ifndef HGVHELPER_H_

#define HGVHELPER_H_

// INCLUDES

#include <e32base.h>

#include <e32std.h>

#include <gdi.h>

#include <VG/openvg.h>

// FORWARD DECLARATIONS

class CFbsBitmap;

class CHgVgEGL;

class CGulIcon;

#define RGBA(r, g, b, a) ((VGuint) (((r) << 24) | ((g) << 16) | ((b) << 8) | (a)))

/**

 * Helper classes and methods for CHgVg* classes.

 */

namespace HgVgHelper

{

    /**--------------------------------------------------------------

     * Vertex and Matrix manipulations helper classes

     --------------------------------------------------------------*/

     // Forward declarations

    class TMatrix;

    class TVertex;

     /**

     * 3D Vertex class

     */

    class TVertex

       {

       public:

           // model coordinates

           VGfloat iX, iY, iZ;

           // transformed mode-view-coordinates

           VGfloat iTx, iTy, iTz;

           // projected screen coordinates

           VGfloat iScreenX;

           VGfloat iScreenY;

           /**

            * Projects model-view-coordinates to screen space coordinates.

            * 

            * @param aScreenWidth width of the rendering window

            * @param aScreenHeight height of the rendering window

            * @param aFov field of view to use

            */

           void ProjectPoint(VGfloat aScreenWidth, VGfloat aScreenHeight, VGfloat aFov);

           /**

            * Transform model coordinates by matrix given and sets

            * result to tranformed model-view-coordinates.

            * 

            * @param aMatrix model-view-transformation matrix.

            */

           void TransformPoint(const TMatrix& aMatrix);

       };

     /**

      * 4x4 Matrix class

      */

     class TMatrix

       {

       public:

           // matrix data

           VGfloat iM[4][4];

           // Construction and destruction.

           TMatrix();

           TMatrix(const TMatrix& rhs);

           ~TMatrix();

           // Operators

           TMatrix& operator=(const TMatrix& rhs);

           /**

            * Makes this matrix identity matrix.

            */

           void Identity();

           /**

            * Multiplies this matrix by rhs matrix.

            * 

            * @param rhs Right hand side matrix.

            */

           void Multiply(const TMatrix& rhs);

           /**

            * Sets this matrix to rotation matrix around X-axis.

            * 

            * @param aAngle angle in radians.

            */

           void RotationX(VGfloat aAngle);

           /**

            * Sets this matrix to rotation matrix around Y-axis.

            * 

            * @param aAngle angle in radians.

            */

           void RotationY(VGfloat aAngle);

           /**

            * Sets this matrix to rotation matrix around Z-axis.

            * 

            * @param aAngle angle in radians.

            */

           void RotationZ(VGfloat aAngle);

           /**

            * Sets this matrix to scale matrix.

            * 

            * @param aSx scaling on X-axis

            * @param aSy scaling on Y-axis

            * @param aSz scaling on Z-axis

            */

           void Scale(VGfloat aSx, VGfloat aSy, VGfloat aSz);

           /**

            * Sets this matrix to translation matrix.

            * 

            * @param aTx translation on X-axis.

            * @param aTy translation on Y-axis.

            * @param aTz translation on Z-axis. 

            */

           void Translation(VGfloat aTx, VGfloat aTy, VGfloat aTz);

       };

     /**--------------------------------------------------------------

      * IMAGE HANDLING ROUTINES

     --------------------------------------------------------------*/

    /**

     * Creates VGImage from CGuiIcon.

     * May leave for example if runs out of video memory.

     * 

     * @param aIcon valid CGuiIcon-object.

     * @return VGImage-object.

     */

    VGImage CreateVgImageFromIconL( const CGulIcon& aIcon );

    /**--------------------------------------------------------------

     * Misc. Helpers.

     --------------------------------------------------------------*/

    /**

     * Clamps value between lower and upper limits.

     * 

     * @param aValue value.

     * @param aUpper upper limit.

     * @param aLower lower limit.

     * @return clamped value.

     */

    VGfloat Clamp(VGfloat aValue, VGfloat aUpper, VGfloat aLower);

    /**

     * Linearly interpolates value between start and end.

     * 

     * @param aStart starting value.

     * @param aEnd ending value.

     * @param aT t value between 0.0f - 1.0f.

     */

    VGfloat Lerp(VGfloat aStart, VGfloat aEnd, VGfloat aT);

    /**

     * Gets values absolute.

     * 

     * @param aValue value.

     * @return absolute of the value.

     */

    VGfloat Abs(VGfloat aValue);    

    /**

     * Calculates bounding rect from points.

     * 

     * @param aRect destination rect-object, rectangle in symbian screen coordinates.

     * @param aPoints source points in vg coordinates (x, y, x, y...). 

     * @param aNumPoints number of points in aPoints.

     */

    void CalculateBoundingRect(TRect& aRect, VGfloat* aPoints, TInt aNumPoints, 

            const TRect& aWindowRect);    

    /**

     * Draws vg image to current vg surface.

     * NOTE: Assumes that the image is in vg coordinates.

     * 

     * @param aImage image to draw.

     * @param aPos position where to draw (in symbian screen coordinates).

     * @param aWindowRect drawing windows rectangle.

     */

    /**

     * Draws vg image to current vg surface multiplying its colors by a color.

     * NOTE: Assumes that the image is in vg coordinates.

     * 

     * @param aImage image to draw.

     * @param aColor color which is multiplied with image colors.

     * @param aPos position where the image is drawn (in sumbian screen coordinates)

     * @param aWindowRect drawing windows renctangle.

     */

    void DrawImageColorized(VGImage aImage, const TRgb& aColor, 

    /**

     * Wrapper for creating paths.

     * 

     * @param aNumSegment

     * @param aSegments

     * @param aPoints

     */

    VGPath CreatePath(VGuint aNumSegments, const VGubyte* aSegments, const VGfloat* aPoints);

    /**

     * Wrapper for creating single color paints.

     * 

     * @param aColor

     */

    VGPaint CreateColorPaint(const TRgb& aColor);

    /**

     * Wrapper for creating single color paints.

     * 

     * @param aColor

     */

    VGPaint CreateColorPaint(const VGfloat* aColor);

    }

#endif /* HGVGHELPER */