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

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbCore module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser 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 will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

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

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

**

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

** Nokia at developer.feedback@nokia.com.

**

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

#include "hbnvgfittoviewbox_p.h"

HbNvgFitToViewBoxImpl::HbNvgFitToViewBoxImpl()

        mAlign(HbNvgEngine::NvgPreserveAspectRatioXmidYmid),

        mMeetSlice(HbNvgEngine::NvgMeet)

{

    mVbX    = 0.0;

    mVbY    = 0.0;

    mVbW   = 0.0;

    mVbH    = 0.0;

}

HbNvgFitToViewBoxImpl::~HbNvgFitToViewBoxImpl()

{

}

void HbNvgFitToViewBoxImpl::setWindowViewportTrans(const QRect &viewPort, const QSize &size)

{

    //VIEWPORT NUMBERS

    qreal viewPortX = viewPort.left();

    qreal viewPortY = viewPort.top();

    qreal viewPortWidth = viewPort.width();

    qreal viewPortHeight = viewPort.height();

    vgSeti(VG_MATRIX_MODE, VG_MATRIX_PATH_USER_TO_SURFACE);

    vgTranslate(viewPortX, viewPortY);

    qreal viewBoxXmin;

    qreal viewBoxYmin;

    qreal viewBoxWidth;

    qreal viewBoxHeight;

    if (mViewBoxDefined) {

        viewBoxXmin = mVbX;

        viewBoxYmin = mVbY;

        viewBoxWidth = mVbW;

        viewBoxHeight = mVbH;

    } else {

        //this will default viewBox to <svg> element width and height

        viewBoxXmin = 0;

        viewBoxYmin = 0;

        viewBoxWidth = size.width();

        viewBoxHeight = size.height();

    }

    if (viewBoxWidth == 0.0f || viewBoxHeight == 0.0f) {

        return;

    }

    qreal sx = viewPortWidth / viewBoxWidth;

    qreal sy = viewPortHeight / viewBoxHeight;

    if (sx == 0.0f || sy == 0.0f) {

        return;

    }

    qreal xtrans = qreal(-1.0f) * viewBoxXmin;

    qreal ytrans = qreal(-1.0f) * viewBoxYmin;

    switch (mAlign) {

    case HbNvgEngine::NvgPreserveAspectRatioNone:

        /* Non uniform scaling */

        //none - Do not force uniform scaling.

        //Scale the graphic content of the given element

        //non-uniformly if necessary such that the element's

        //bounding box exactly matches the viewport rectangle.

        break;

    case HbNvgEngine::NvgPreserveAspectRatioXminYmin:

        //Align the <min-x> of the element's viewBox with the smallest X value of the viewport.

        //Align the <min-y> of the element's viewBox with the smallest Y value of the viewport.

        if (mMeetSlice == HbNvgEngine::NvgMeet) {

            if (sx > sy) {

                sx = sy;

                //no change for xtrans...default above

            } else { // (sx < sy)

                sy = sx;

                //no change for ytrans...default above

            }

        } else if (mMeetSlice == HbNvgEngine::NvgSlice) {

            if (sx > sy) {

                sy = sx;

            } else { // (sx < sy)

                sx = sy;

            }

        }

        break;

    case HbNvgEngine::NvgPreserveAspectRatioXmidYmin:

        //Align the midpoint X value of the element's viewBox with the midpoint X value of the viewport.

        //Align the <min-y> of the element's viewBox with the smallest Y value of the viewport.

        //Align the <min-x> of the element's viewBox with the smallest X value of the viewport.

        //Align the <min-y> of the element's viewBox with the smallest Y value of the viewport.

        if (mMeetSlice == HbNvgEngine::NvgMeet) {

            if (sx > sy) {

                sx = sy;

                xtrans = ((viewPortWidth - ((viewBoxWidth / viewBoxHeight) * viewPortHeight)) * (.5f)) / sx - viewBoxXmin;

            } else {

                sy = sx;

                //no change for ytrans...default above

            }

        } else if (mMeetSlice == HbNvgEngine::NvgSlice) {

            if (sx > sy) {

                sy = sx;

            } else {

                sx = sy;

                xtrans = viewPortWidth - sx * viewBoxWidth;

                xtrans = xtrans / sx;

                xtrans = xtrans / qreal(2) - viewBoxXmin;

            }

        }

        break;

    case HbNvgEngine::NvgPreserveAspectRatioXmaxYmin:

        //Align the <min-x>+<width> of the element's viewBox with the maximum X value of the viewport.

        //Align the <min-y> of the element's viewBox with the smallest Y value of the viewport.

        if (mMeetSlice == HbNvgEngine::NvgMeet) {

            if (sx > sy) {

                sx = sy;

                xtrans = ((viewPortWidth - ((viewBoxWidth / viewBoxHeight) * viewPortHeight))) / sx - viewBoxXmin;

            } else {

                sy = sx;

                //no change for ytrans...default above

            }

        } else if (mMeetSlice == HbNvgEngine::NvgSlice) {

            if (sx > sy) {

                sy = sx;

                //no change for ytrans...default above

            } else {

                sx = sy;

                xtrans = viewPortWidth - sx * viewBoxWidth;

                xtrans = xtrans / sx - viewBoxXmin;

            }

        }

        break;

    case HbNvgEngine::NvgPreserveAspectRatioXminYmid:

        //Align the <min-x> of the element's viewBox with the smallest X value of the viewport.

        //Align the midpoint Y value of the element's viewBox with the midpoint Y value of the viewport.

        if (mMeetSlice == HbNvgEngine::NvgMeet) {

            if (sx > sy) {

                sx = sy;

                //no change for xtrans...default above

            } else {

                sy = sx;

                ytrans = ((qreal)

                          (viewPortHeight - ((qreal)(viewBoxHeight / viewBoxWidth) * viewPortWidth)) * qreal(.5f)) / sy - viewBoxYmin;

            }

        } else if (mMeetSlice == HbNvgEngine::NvgSlice) {

            if (sx > sy) {

                sy = sx;

                ytrans = viewPortHeight - sx * viewBoxHeight;

                ytrans = ytrans / sx;

                ytrans = ytrans / qreal(2) - viewBoxYmin;

            } else {

                sx = sy;

            }

        }

        break;

    case HbNvgEngine::NvgPreserveAspectRatioXmidYmid:

        //(default) case

        //Align the midpoint X value of the element's viewBox with the midpoint X value of the viewport.

        //Align the midpoint Y value of the element's viewBox with the midpoint Y value of the viewport.

        if (mMeetSlice == HbNvgEngine::NvgMeet) {

            if (sx > sy) {

                sx = sy;

                xtrans = ((viewPortWidth - ((viewBoxWidth / viewBoxHeight) * viewPortHeight)) * (.5f)) / sx - viewBoxXmin;

            } else if (sx < sy) {

                sy = sx;

                ytrans = ((viewPortHeight - ((viewBoxHeight / viewBoxWidth) * viewPortWidth)) * (.5f)) / sy - viewBoxYmin;

            }

        } else if (mMeetSlice == HbNvgEngine::NvgSlice) {

            if (sx > sy) {

                sy = sx;

                ytrans = viewPortHeight - sx * viewBoxHeight;

                ytrans = ytrans / sx;

                ytrans = ytrans / qreal(2) - viewBoxYmin;

            } else {

                sx = sy;

                xtrans = viewPortWidth - sx * viewBoxWidth;

                xtrans = xtrans / sx;

                xtrans = xtrans / qreal(2) - viewBoxXmin;

            }

        }

        break;

    case HbNvgEngine::NvgPreserveAspectRatioXmaxYmid:

        //Align the <min-x>+<width> of the element's viewBox with the maximum X value of the viewport.

        //Align the midpoint Y value of the element's viewBox with the midpoint Y value of the viewport.

        if (mMeetSlice == HbNvgEngine::NvgMeet) {

            if (sx > sy) {

                sx = sy;

                xtrans = ((viewPortWidth - ((viewBoxWidth / viewBoxHeight) * viewPortHeight))) / sx - viewBoxXmin;

            } else {

                sy = sx;

                ytrans = ((viewPortHeight - ((viewBoxHeight / viewBoxWidth) * viewPortWidth)) * (.5f)) / sy - viewBoxYmin;

            }

        } else if (mMeetSlice == HbNvgEngine::NvgSlice) {

            if (sx > sy) {

                sy = sx;

                ytrans = viewPortHeight - sx * viewBoxHeight;

                ytrans = ytrans / sx;

                ytrans = ytrans / qreal(2) - viewBoxYmin;

            } else {

                sx = sy;

                xtrans = viewPortWidth - sx * viewBoxWidth;

                xtrans = xtrans / sx - viewBoxXmin;

            }

        }

        break;

    case HbNvgEngine::NvgPreserveAspectRatioXminYmax:

        //Align the <min-x> of the element's viewBox with the smallest X value of the viewport.

        //Align the <min-y>+<height> of the element's viewBox with the maximum Y value of the viewport.

        if (mMeetSlice == HbNvgEngine::NvgMeet) {

            if (sx > sy) {

                sx = sy;

                //no change for xtrans...default above

            } else {

                sy = sx;

                ytrans = ((viewPortHeight - ((viewBoxHeight / viewBoxWidth) * viewPortWidth))) / sy - viewBoxYmin;

            }

        } else if (mMeetSlice == HbNvgEngine::NvgSlice) {

            if (sx > sy) {

                sy = sx;

                ytrans = viewPortHeight - sx * viewBoxHeight;

                ytrans = ytrans / sx - viewBoxYmin;

            } else {

                sx = sy;

            }

        }

        break;

    case HbNvgEngine::NvgPreserveAspectRatioXmidYmax:

        //Align the midpoint X value of the element's viewBox with the midpoint X value of the viewport.

        //Align the <min-y>+<height> of the element's viewBox with the maximum Y value of the viewport.

        if (mMeetSlice == HbNvgEngine::NvgMeet) {

            if (sx > sy) {

                sx = sy;

                xtrans = ((viewPortWidth - ((viewBoxWidth / viewBoxHeight) * viewPortHeight)) * qreal(.5f)) / sx - viewBoxXmin;

            } else {

                sy = sx;

                ytrans = ((viewPortHeight - ((viewBoxHeight / viewBoxWidth) * viewPortWidth))) / sy - viewBoxYmin;

            }

        } else if (mMeetSlice == HbNvgEngine::NvgSlice) {

            if (sx > sy) {

                sy = sx;

                ytrans = viewPortHeight - sx * viewBoxHeight;

                ytrans = ytrans / sx - viewBoxYmin;

            } else {

                sx = sy;

                xtrans = viewPortWidth - sx * viewBoxWidth;

                xtrans = xtrans / sx;

                xtrans = xtrans / qreal(2) - viewBoxXmin;

            }

        }

        break;

    case HbNvgEngine::NvgPreserveAspectRatioXmaxYmax:

        //Align the <min-x>+<width> of the element's viewBox with the maximum X value of the viewport.

        //Align the <min-y>+<height> of the element's viewBox with the maximum Y value of the viewport.

        if (mMeetSlice == HbNvgEngine::NvgMeet) {

            if (sx > sy) {

                sx = sy;

                xtrans = ((viewPortWidth - ((viewBoxWidth / viewBoxHeight) * viewPortHeight))) / sx - viewBoxXmin;

            } else {

                sy = sx;

                ytrans = ((viewPortHeight - ((viewBoxHeight / viewBoxWidth) * viewPortWidth))) / sy - viewBoxYmin;

            }

        } else if (mMeetSlice == HbNvgEngine::NvgSlice) {

            if (sx > sy) {

                sy = sx;

                ytrans = viewPortHeight - sx * viewBoxHeight;

                ytrans = ytrans / sx - viewBoxYmin;

            } else {

                sx = sy;

                xtrans = viewPortWidth - sx * viewBoxWidth;

                xtrans = xtrans / sx - viewBoxXmin;

            }

        }

        break;

    default:

        break;

    }

    vgScale(sx, sy);

    vgTranslate(xtrans, ytrans);

}