/*  This file is part of the KDE project.

Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

This library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2.1 or 3 of the License.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this library.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "utils.h"
#include <e32std.h>

QT_BEGIN_NAMESPACE

using namespace Phonon;
using namespace Phonon::MMF;

/*! \namespace Phonon::MMF::Utils
  \internal
*/

/*! \class Phonon::MMF::TTraceContext
  \internal
*/

/*! \enum Phonon::MMF::PanicCode
 \internal
*/

/*! \enum Phonon::MMF::TTraceCategory
 \internal
*/

/*! \enum Phonon::MMF::MediaType
 \internal
*/

_LIT(PanicCategory, "Phonon::MMF");

void MMF::Utils::panic(PanicCode code)
{
    User::Panic(PanicCategory, code);
}


static const TInt KMimePrefixLength = 6; // either "audio/" or "video/"
_LIT(KMimePrefixAudio, "audio/");
_LIT(KMimePrefixVideo, "video/");

MMF::MediaType MMF::Utils::mimeTypeToMediaType(const TDesC& mimeType)
{
    MediaType result = MediaTypeUnknown;

    if (mimeType.Left(KMimePrefixLength).Compare(KMimePrefixAudio) == 0) {
        result = MediaTypeAudio;
    } else if (mimeType.Left(KMimePrefixLength).Compare(KMimePrefixVideo) == 0) {
        result = MediaTypeVideo;
    }

    return result;
}


#ifndef QT_NO_DEBUG

#include <hal.h>
#include <hal_data.h>
#include <gdi.h>
#include <eikenv.h>

struct TScreenInfo
{
    int width;
    int height;
    int bpp;
    const char* address;
    int initialOffset;
    int lineOffset;
    TDisplayMode displayMode;
};

static void getScreenInfoL(TScreenInfo& info)
{
    info.displayMode = CEikonEnv::Static()->ScreenDevice()->DisplayMode();

    // Then we must set these as the input parameter
    info.width = info.displayMode;
    info.height = info.displayMode;
    info.initialOffset = info.displayMode;
    info.lineOffset = info.displayMode;
    info.bpp = info.displayMode;

    User::LeaveIfError( HAL::Get(HALData::EDisplayXPixels, info.width) );
    User::LeaveIfError( HAL::Get(HALData::EDisplayYPixels, info.width) );

    int address;
    User::LeaveIfError( HAL::Get(HALData::EDisplayMemoryAddress, address) );
    info.address = reinterpret_cast<const char*>(address);

    User::LeaveIfError( HAL::Get(HALData::EDisplayOffsetToFirstPixel, info.initialOffset) );

    User::LeaveIfError( HAL::Get(HALData::EDisplayOffsetBetweenLines, info.lineOffset) );

    User::LeaveIfError( HAL::Get(HALData::EDisplayBitsPerPixel, info.bpp) );
}


QColor MMF::Utils::getScreenPixel(const QPoint& pos)
{
    TScreenInfo info;
    TRAPD(err, getScreenInfoL(info));
    QColor pixel;
    if (err == KErrNone and pos.x() < info.width and pos.y() < info.height)
    {
        const int bytesPerPixel = info.bpp / 8;
        Q_ASSERT(bytesPerPixel >= 3);

        const int stride = (info.width * bytesPerPixel) + info.lineOffset;

        const char* ptr =
                info.address
            +    info.initialOffset
            +    pos.y() * stride
            +    pos.x() * bytesPerPixel;

        // BGRA
        pixel.setBlue(*ptr++);
        pixel.setGreen(*ptr++);
        pixel.setRed(*ptr++);

        if (bytesPerPixel == 4)
            pixel.setAlpha(*ptr++);
    }
    return pixel;
}

// Debugging: for debugging video visibility
void MMF::Utils::dumpScreenPixelSample()
{
    for (int i=0; i<20; ++i) {
        const QPoint pos(i*10, i*10);
        const QColor pixel = Utils::getScreenPixel(pos);
        RDebug::Printf(
            "Phonon::MMF::Utils::dumpScreenPixelSample %d %d = %d %d %d %d",
            pos.x(), pos.y(), pixel.red(), pixel.green(), pixel.blue(), pixel.alpha()
        );
    }
}

#endif // _DEBUG

QT_END_NAMESPACE