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#include "qdirectfbblitter.h"
#include "qdirectfbconvenience.h"

#include <QtGui/private/qpixmap_blitter_p.h>

#include <QDebug>

#include <directfb.h>


static QBlittable::Capabilities dfb_blitter_capabilities()
{
    return QBlittable::Capabilities(QBlittable::SolidRectCapability
                                    |QBlittable::SourcePixmapCapability
                                    |QBlittable::SourceOverPixmapCapability
                                    |QBlittable::SourceOverScaledPixmapCapability);
}

QDirectFbBlitter::QDirectFbBlitter(const QSize &rect, IDirectFBSurface *surface)
    : QBlittable(rect, dfb_blitter_capabilities())
        , m_surface(surface)
{
        m_surface->AddRef(m_surface.data());
}

QDirectFbBlitter::QDirectFbBlitter(const QSize &rect, bool alpha)
    : QBlittable(rect, dfb_blitter_capabilities())
{
    DFBSurfaceDescription surfaceDesc;
    memset(&surfaceDesc,0,sizeof(DFBSurfaceDescription));
    surfaceDesc.width = rect.width();
    surfaceDesc.height = rect.height();

    if (alpha) {
        surfaceDesc.caps = DSCAPS_PREMULTIPLIED;
        surfaceDesc.pixelformat = QDirectFbBlitter::alphaPixmapFormat();
        surfaceDesc.flags = DFBSurfaceDescriptionFlags(DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_CAPS | DSDESC_PIXELFORMAT);
    } else {
        surfaceDesc.flags = DFBSurfaceDescriptionFlags(DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_PIXELFORMAT);
        surfaceDesc.pixelformat = QDirectFbBlitter::pixmapFormat();
    }


    IDirectFB *dfb = QDirectFbConvenience::dfbInterface();
    dfb->CreateSurface(dfb , &surfaceDesc, m_surface.outPtr());
    m_surface->Clear(m_surface.data(), 0, 0, 0, 0);
}

QDirectFbBlitter::~QDirectFbBlitter()
{
    unlock();
}

DFBSurfacePixelFormat QDirectFbBlitter::alphaPixmapFormat()
{
    return DSPF_ARGB;
}

DFBSurfacePixelFormat QDirectFbBlitter::pixmapFormat()
{
    return DSPF_RGB32;
}

DFBSurfacePixelFormat QDirectFbBlitter::selectPixmapFormat(bool withAlpha)
{
    return withAlpha ? alphaPixmapFormat() : pixmapFormat();
}

void QDirectFbBlitter::fillRect(const QRectF &rect, const QColor &color)
{
    m_surface->SetColor(m_surface.data(), color.red(), color.green(), color.blue(), color.alpha());
//    When the blitter api supports non opaque blits, also remember to change
//    qpixmap_blitter.cpp::fill
//    DFBSurfaceDrawingFlags drawingFlags = color.alpha() ? DSDRAW_BLEND : DSDRAW_NOFX;
//    m_surface->SetDrawingFlags(m_surface, drawingFlags);
    m_surface->SetDrawingFlags(m_surface.data(), DSDRAW_NOFX);
    m_surface->FillRectangle(m_surface.data(), rect.x(), rect.y(),
                              rect.width(), rect.height());
}

void QDirectFbBlitter::drawPixmap(const QRectF &rect, const QPixmap &pixmap, const QRectF &srcRect)
{
    QPlatformPixmap *data = pixmap.handle();
    Q_ASSERT(data->width() && data->height());
    Q_ASSERT(data->classId() == QPlatformPixmap::BlitterClass);
    QBlittablePlatformPixmap *blitPm = static_cast<QBlittablePlatformPixmap*>(data);
    QDirectFbBlitter *dfbBlitter = static_cast<QDirectFbBlitter *>(blitPm->blittable());
    dfbBlitter->unlock();

    IDirectFBSurface *s = dfbBlitter->m_surface.data();

    DFBSurfaceBlittingFlags blittingFlags = DSBLIT_NOFX;
    DFBSurfacePorterDuffRule porterDuff = DSPD_SRC;
    if (pixmap.hasAlpha()) {
        blittingFlags = DSBLIT_BLEND_ALPHACHANNEL;
        porterDuff = DSPD_SRC_OVER;
    }

    m_surface->SetBlittingFlags(m_surface.data(), DFBSurfaceBlittingFlags(blittingFlags));
    m_surface->SetPorterDuff(m_surface.data(), porterDuff);
    m_surface->SetDstBlendFunction(m_surface.data(), DSBF_INVSRCALPHA);

    const DFBRectangle sRect = { srcRect.x(), srcRect.y(), srcRect.width(), srcRect.height() };

    DFBResult result;
    if (rect.width() == srcRect.width() && rect.height() == srcRect.height())
        result = m_surface->Blit(m_surface.data(), s, &sRect, rect.x(), rect.y());
    else {
        const DFBRectangle dRect = { rect.x(), rect.y(), rect.width(), rect.height() };
        result = m_surface->StretchBlit(m_surface.data(), s, &sRect, &dRect);
    }
    if (result != DFB_OK)
        DirectFBError("QDirectFBBlitter::drawPixmap()", result);
}

QImage *QDirectFbBlitter::doLock()
{
    Q_ASSERT(m_surface);
    Q_ASSERT(size().isValid());

    void *mem;
    int bpl;
    const DFBResult result = m_surface->Lock(m_surface.data(), DFBSurfaceLockFlags(DSLF_WRITE|DSLF_READ), static_cast<void**>(&mem), &bpl);
    if (result == DFB_OK) {
        DFBSurfacePixelFormat dfbFormat;
        DFBSurfaceCapabilities dfbCaps;
        m_surface->GetPixelFormat(m_surface.data(), &dfbFormat);
        m_surface->GetCapabilities(m_surface.data(), &dfbCaps);
        QImage::Format format = QDirectFbConvenience::imageFormatFromSurfaceFormat(dfbFormat, dfbCaps);
        int w, h;
        m_surface->GetSize(m_surface.data(), &w, &h);
        m_image = QImage(static_cast<uchar *>(mem),w,h,bpl,format);
    } else {
        DirectFBError("Failed to lock image", result);
    }

    return &m_image;
}

void QDirectFbBlitter::doUnlock()
{
    m_surface->Unlock(m_surface.data());
}