/*

* 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:    

*

*/

#include "hgvgquadrenderer.h"

#include "hgtransformedquad.h"

#include "hgquad.h"

#include "hgvgimage.h"

#include "trace.h"

#include <VG/openvg.h>

#include <VG/vgu.h>

#include <QVector2D>

#include <QPolygon>

#include <QMatrix4x4>

#include <QPainter>

static void matrixFromTransform(VGfloat* matrix, const QTransform& tm)

{

    matrix[0] = tm.m11();

    matrix[1] = tm.m12();

    matrix[2] = tm.m13();

    matrix[3] = tm.m21();

    matrix[4] = tm.m22();

    matrix[5] = tm.m23();

    matrix[6] = tm.m31();

    matrix[7] = tm.m32();

    matrix[8] = tm.m33();

}

class HgVgQuad : public HgTransformedQuad

{

public:

    HgVgQuad(HgVgQuadRenderer* renderer) : HgTransformedQuad(-1), mRenderer(renderer)

    {

    }

    ~HgVgQuad()

    {

    }

    void draw(QPainter* painter, const QRectF& rect)    

    {

        Q_UNUSED(painter)

        Q_UNUSED(rect)

        if (!mQuad->visible())

            return;

        HgVgImage* image = (HgVgImage*)mQuad->image();

        if (image == NULL  || image->alpha() == 0)

        {

            if (mRenderer->defaultImage()) {

                drawImage(mRenderer->defaultImage(), 1.0f);

            }

        }

        else

        {

            image->upload(mQuad->mirrorImageEnabled());

            if (image->image() == VG_INVALID_HANDLE)

            {

                if (mRenderer->defaultImage()) {

                    drawImage(mRenderer->defaultImage(), 1.0f);

                }

            }

            else

            {

                if ( mQuad->alpha() < 1.0f )

                {

                    if (mRenderer->defaultImage()) {

                        drawImage(mRenderer->defaultImage(), 1.0f - mQuad->alpha());            

                    }

                }

                drawImage(image, mQuad->alpha());

            }

        }

    }

    void drawImage(HgVgImage* image, qreal alpha)

    {

        Q_UNUSED(alpha)

        VGImage vgImage = image->image();

        vgSeti(VG_MATRIX_MODE, VG_MATRIX_IMAGE_USER_TO_SURFACE);

        VGfloat m[9];

        vgGetMatrix(m);

        computeWarpMatrix(mMatrix, image->width(), image->height(), mTransformedPoints, QVector2D());

        vgMultMatrix(mMatrix);

        vgDrawImage(vgImage);    

        vgLoadMatrix(m);

        if (mQuad->mirrorImageEnabled())

        {

            VGImage mirrorImage = image->mirrorImage();

            if (mirrorImage == VG_INVALID_HANDLE)

                return;

            computeWarpMatrix(mMirrorMatrix, image->mirrorImageWidth(), image->mirrorImageHeight(), mMirroredPoints, QVector2D());

            vgMultMatrix(mMirrorMatrix);

            vgDrawImage(mirrorImage);    

            vgLoadMatrix(m);    

        }

    }

private:

    void computeWarpMatrix(VGfloat* matrix, int pxWidth, int pxHeight, const QVector2D* points, 

        const QVector2D& translate)

    {        

        Q_UNUSED(translate)

        vguComputeWarpQuadToQuad(

            points[0].x(), points[0].y(), 

            points[1].x(), points[1].y(),

            points[2].x(), points[2].y(),

            points[3].x(), points[3].y(),

            0, pxHeight,

            pxWidth, pxHeight,

            pxWidth, 0,

            0, 0,

            matrix);

    }

    HgVgQuadRenderer* mRenderer;

    VGfloat mMatrix[9];

    VGfloat mMirrorMatrix[9];

};

HgVgQuadRenderer::HgVgQuadRenderer(int maxQuads) : 

    HgTransformedQuadRenderer(maxQuads),

    mDefaultVgImage(NULL)

{

    init(maxQuads);

}

HgVgQuadRenderer::~HgVgQuadRenderer()

{

    delete mDefaultVgImage;

}

void HgVgQuadRenderer::drawQuads(QPainter* painter, const QRectF& rect, 

    const QMatrix4x4& viewMatrix, const QMatrix4x4& projectionMatrix,

    Qt::Orientation orientation, 

    const QTransform& sceneTransform)

{

    // start direct vg

    painter->beginNativePainting();

    // setup default vg states

    vgSeti(VG_COLOR_TRANSFORM, VG_FALSE);

    vgSeti(VG_BLEND_MODE, VG_BLEND_SRC_OVER);

    vgSeti(VG_IMAGE_MODE, VG_DRAW_IMAGE_NORMAL);

    // setup root transform

    vgSeti(VG_MATRIX_MODE, VG_MATRIX_IMAGE_USER_TO_SURFACE);

    VGfloat toVgMatrix[9];

    matrixFromTransform(toVgMatrix, qtToVgTransform(painter, sceneTransform, rect, orientation));

    vgLoadMatrix(toVgMatrix);   

    // transform quads to screen

    transformQuads(viewMatrix, projectionMatrix, QPointF(rect.width()/2, rect.height()/2), 

        QSizeF(rect.width(), rect.height()));

    drawTransformedQuads(painter, rect);

    // end directt vg

    painter->endNativePainting();

}

HgImage* HgVgQuadRenderer::createNativeImage()

{    

    return new HgVgImage(this);   

}

HgTransformedQuad* HgVgQuadRenderer::createNativeQuad()

{

    return new HgVgQuad(this);

}

HgVgImage* HgVgQuadRenderer::defaultImage()

{

    if (mDefaultVgImage && mDefaultVgImage->image() == VG_INVALID_HANDLE) {

        mDefaultVgImage->upload(true);

    }

    return mDefaultVgImage;

}

void HgVgQuadRenderer::setDefaultImage(QImage defaultImage)

{

    HgQuadRenderer::setDefaultImage(defaultImage);

    delete mDefaultVgImage;

    mDefaultVgImage = 0;

    mDefaultVgImage = static_cast<HgVgImage*>(createNativeImage());

    mDefaultVgImage->setImage(mDefaultImage);

    mDefaultVgImage->upload(true);    

}

QTransform HgVgQuadRenderer::qtToVgTransform(QPainter* painter, const QTransform& sceneTransform, 

    const QRectF& rect, Qt::Orientation orientation) const

{

    QTransform t;

    if (orientation == Qt::Vertical)

    {

        t.translate(sceneTransform.dx(), painter->viewport().height() - sceneTransform.dy());

        t.scale(1, -1);    

    }

    else

    {

        // TODO: this will need reviewing later :)

        t.translate(rect.bottom(), 0);

        t.scale(-1, 1);

        t.translate(0, rect.right());

        t.rotate(-90, Qt::ZAxis);        

    }

    return t;

}