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#include "qpixmapdata_vg_p.h"
#include "qvgfontglyphcache_p.h"
#include <QtGui/private/qnativeimagehandleprovider_p.h>
#include <private/qt_s60_p.h>

#include <fbs.h>

#ifdef QT_SYMBIAN_SUPPORTS_SGIMAGE
#  include <sgresource/sgimage.h>
#  ifdef SYMBIAN_FBSERV_GLYPHDATA // defined in fbs.h
#    define QT_SYMBIAN_HARDWARE_GLYPH_CACHE
#    include <graphics/fbsglyphdataiterator.h>
#    include <private/qfontengine_s60_p.h>
#  endif
#endif

QT_BEGIN_NAMESPACE

typedef VGImage (*_vgCreateEGLImageTargetKHR)(VGeglImageKHR);
static _vgCreateEGLImageTargetKHR qt_vgCreateEGLImageTargetKHR = 0;

namespace QVG
{
    VGImage vgCreateEGLImageTargetKHR(VGeglImageKHR eglImage);
}

VGImage QVG::vgCreateEGLImageTargetKHR(VGeglImageKHR eglImage)
{
    if (!qt_vgCreateEGLImageTargetKHR && QEgl::hasExtension("EGL_KHR_image"))
        qt_vgCreateEGLImageTargetKHR = (_vgCreateEGLImageTargetKHR) eglGetProcAddress("vgCreateEGLImageTargetKHR");

    return qt_vgCreateEGLImageTargetKHR ? qt_vgCreateEGLImageTargetKHR(eglImage) : 0;
}

extern int qt_vg_pixmap_serial;

#ifdef QT_SYMBIAN_SUPPORTS_SGIMAGE
static VGImage sgImageToVGImage(QEglContext *context, const RSgImage &sgImage)
{
    // when "0" used as argument then
    // default display, context are used
    if (!context)
        context = qt_vg_create_context(0, QInternal::Pixmap);

    VGImage vgImage = VG_INVALID_HANDLE;

    if (sgImage.IsNull())
        return vgImage;

    const EGLint KEglImageAttribs[] = {EGL_IMAGE_PRESERVED_SYMBIAN, EGL_TRUE, EGL_NONE};
    EGLImageKHR eglImage = QEgl::eglCreateImageKHR(QEgl::display(),
            EGL_NO_CONTEXT,
            EGL_NATIVE_PIXMAP_KHR,
            (EGLClientBuffer)&sgImage,
            (EGLint*)KEglImageAttribs);

    if (!eglImage)
        return vgImage;

    vgImage = QVG::vgCreateEGLImageTargetKHR(eglImage);

    QEgl::eglDestroyImageKHR(QEgl::display(), eglImage);
    return vgImage;
}
#endif

void QVGPixmapData::cleanup()
{
    is_null = w = h = 0;
    recreate = false;
    source = QVolatileImage();
}

bool QVGPixmapData::initFromNativeImageHandle(void *handle, const QString &type)
{
    if (type == QLatin1String("RSgImage")) {
        fromNativeType(handle, QPixmapData::SgImage);
        return true;
    } else if (type == QLatin1String("CFbsBitmap")) {
        fromNativeType(handle, QPixmapData::FbsBitmap);
        return true;
    }
    return false;
}

void QVGPixmapData::createFromNativeImageHandleProvider()
{
    void *handle = 0;
    QString type;
    nativeImageHandleProvider->get(&handle, &type);
    if (handle) {
        if (initFromNativeImageHandle(handle, type)) {
            nativeImageHandle = handle;
            nativeImageType = type;
        } else {
            qWarning("QVGPixmapData: Unknown native image type '%s'", qPrintable(type));
        }
    } else {
        qWarning("QVGPixmapData: Native handle is null");
    }
}

void QVGPixmapData::releaseNativeImageHandle()
{
    if (nativeImageHandleProvider && nativeImageHandle) {
        nativeImageHandleProvider->release(nativeImageHandle, nativeImageType);
        nativeImageHandle = 0;
        nativeImageType = QString();
    }
}

static inline bool conversionLessFormat(QImage::Format format)
{
    switch (format) {
        case QImage::Format_RGB16: // EColor64K
        case QImage::Format_RGB32: // EColor16MU
        case QImage::Format_ARGB32: // EColor16MA
        case QImage::Format_ARGB32_Premultiplied: // EColor16MAP
        case QImage::Format_Indexed8: // EGray256, EColor256
            return true;
        default:
            return false;
    }
}

void QVGPixmapData::fromNativeType(void* pixmap, NativeType type)
{
    if (type == QPixmapData::SgImage && pixmap) {
#if defined(QT_SYMBIAN_SUPPORTS_SGIMAGE) && !defined(QT_NO_EGL)
        RSgImage *sgImage = reinterpret_cast<RSgImage*>(pixmap);
        destroyImages();
        prevSize = QSize();

        vgImage = sgImageToVGImage(context, *sgImage);
        if (vgImage != VG_INVALID_HANDLE) {
            w = vgGetParameteri(vgImage, VG_IMAGE_WIDTH);
            h = vgGetParameteri(vgImage, VG_IMAGE_HEIGHT);
            d = 32; // We always use ARGB_Premultiplied for VG pixmaps.
        }

        is_null = (w <= 0 || h <= 0);
        source = QVolatileImage(); // readback will be done later, only when needed
        recreate = false;
        prevSize = QSize(w, h);
        updateSerial();
#endif
    } else if (type == QPixmapData::FbsBitmap && pixmap) {
        CFbsBitmap *bitmap = reinterpret_cast<CFbsBitmap *>(pixmap);
        QSize size(bitmap->SizeInPixels().iWidth, bitmap->SizeInPixels().iHeight);
        resize(size.width(), size.height());
        source = QVolatileImage(bitmap); // duplicates only, if possible
        if (source.isNull())
            return;
        if (!conversionLessFormat(source.format())) {
            // Here we may need to copy if the formats do not match.
            // (e.g. for display modes other than EColor16MAP and EColor16MU)
            source.beginDataAccess();
            QImage::Format format = idealFormat(&source.imageRef(), Qt::AutoColor);
            source.endDataAccess(true);
            source.ensureFormat(format);
        }
        recreate = true;
    } else if (type == QPixmapData::VolatileImage && pixmap) {
        QVolatileImage *img = static_cast<QVolatileImage *>(pixmap);
        resize(img->width(), img->height());
        source = *img;
        recreate = true;
    } else if (type == QPixmapData::NativeImageHandleProvider && pixmap) {
        destroyImages();
        nativeImageHandleProvider = static_cast<QNativeImageHandleProvider *>(pixmap);
        // Cannot defer the retrieval, we need at least the size right away.
        createFromNativeImageHandleProvider();
    }
}

void* QVGPixmapData::toNativeType(NativeType type)
{
    if (type == QPixmapData::SgImage) {
#if defined(QT_SYMBIAN_SUPPORTS_SGIMAGE) && !defined(QT_NO_EGL)
        toVGImage();

        if (!isValid() || vgImage == VG_INVALID_HANDLE)
            return 0;

        TInt err = 0;

        RSgDriver driver;
        err = driver.Open();
        if (err != KErrNone)
            return 0;

        TSgImageInfo sgInfo;
        sgInfo.iPixelFormat = EUidPixelFormatARGB_8888_PRE;
        sgInfo.iSizeInPixels.SetSize(w, h);
        sgInfo.iUsage = ESgUsageBitOpenVgImage | ESgUsageBitOpenVgSurface;

        QScopedPointer<RSgImage> sgImage(new RSgImage());
        err = sgImage->Create(sgInfo, NULL, NULL);
        if (err != KErrNone) {
            driver.Close();
            return 0;
        }

        const EGLint KEglImageAttribs[] = {EGL_IMAGE_PRESERVED_SYMBIAN, EGL_TRUE, EGL_NONE};
        EGLImageKHR eglImage = QEgl::eglCreateImageKHR(QEgl::display(),
                EGL_NO_CONTEXT,
                EGL_NATIVE_PIXMAP_KHR,
                (EGLClientBuffer)sgImage.data(),
                (EGLint*)KEglImageAttribs);
        if (!eglImage || eglGetError() != EGL_SUCCESS) {
            sgImage->Close();
            driver.Close();
            return 0;
        }

        VGImage dstVgImage = QVG::vgCreateEGLImageTargetKHR(eglImage);
        if (!dstVgImage || vgGetError() != VG_NO_ERROR) {
            QEgl::eglDestroyImageKHR(QEgl::display(), eglImage);
            sgImage->Close();
            driver.Close();
            return 0;
        }

        vgCopyImage(dstVgImage, 0, 0,
                vgImage, 0, 0,
                w, h, VG_FALSE);

        if (vgGetError() != VG_NO_ERROR) {
            sgImage->Close();
            sgImage.reset();
        }

        // release stuff
        vgDestroyImage(dstVgImage);
        QEgl::eglDestroyImageKHR(QEgl::display(), eglImage);
        driver.Close();
        return reinterpret_cast<void*>(sgImage.take());
#endif
    } else if (type == QPixmapData::FbsBitmap && isValid()) {
        ensureReadback(true);
        if (source.isNull()) {
            source = QVolatileImage(w, h, sourceFormat());
        }
        // Just duplicate the bitmap handle, no data copying happens.
        return source.duplicateNativeImage();
    }
    return 0;
}

QSymbianVGFontGlyphCache::QSymbianVGFontGlyphCache() : QVGFontGlyphCache()
{
#ifdef QT_SYMBIAN_HARDWARE_GLYPH_CACHE
    invertedGlyphs = true;
#endif
}

void QSymbianVGFontGlyphCache::cacheGlyphs(QVGPaintEnginePrivate *d,
                                           QFontEngine *fontEngine,
                                           const glyph_t *g, int count)
{
#ifdef QT_SYMBIAN_HARDWARE_GLYPH_CACHE
    QFontEngineS60 *s60fontEngine = static_cast<QFontEngineS60*>(fontEngine);
    if (s60fontEngine->m_activeFont->TypeUid() != KCFbsFontUid)
            return QVGFontGlyphCache::cacheGlyphs(d, fontEngine, g, count);

    QVector<glyph_t> uncachedGlyphs;
    while (count-- > 0) {
        // Skip this glyph if we have already cached it before.
        glyph_t glyph = *g++;
        if (((glyph < 256) && ((cachedGlyphsMask[glyph / 32] & (1 << (glyph % 32))) != 0))
            || cachedGlyphs.contains(glyph))
            continue;
        if (!uncachedGlyphs.contains(glyph))
            uncachedGlyphs.append(glyph);
    }

    if (!uncachedGlyphs.isEmpty()) {
        CFbsFont *cfbsFont = static_cast<CFbsFont *>(s60fontEngine->m_activeFont);
        RFbsGlyphDataIterator iter;

        int err = iter.Open(*cfbsFont, (const unsigned int*)uncachedGlyphs.constData(), uncachedGlyphs.count());

        if (err == KErrNotSupported || err == KErrInUse) { // Fallback in possibly supported error cases
            iter.Close();
            qWarning("Falling back to default QVGFontGlyphCache");
            return QVGFontGlyphCache::cacheGlyphs(d, fontEngine, g, count);
        }

        for (; err == KErrNone; err = iter.Next()) {
            const unsigned int glyph = iter.GlyphCode();

            const RSgImage& image = iter.Image();
            const TOpenFontCharMetrics& metrics = iter.Metrics();

            TRect glyphBounds;
            metrics.GetHorizBounds(glyphBounds);
            VGImage vgImage = sgImageToVGImage(0, image);
            VGfloat origin[2];
            VGfloat escapement[2];
            origin[0] = -glyphBounds.iTl.iX;
            origin[1] = glyphBounds.iBr.iY;
            escapement[0] = 0;
            escapement[1] = 0;
            vgSetGlyphToImage(font, glyph, vgImage, origin, escapement);
            vgDestroyImage(vgImage);

            // Add to cache
            if (glyph < 256)
                cachedGlyphsMask[glyph / 32] |= (1 << (glyph % 32));
            else
                cachedGlyphs.insert(glyph);
        }
        iter.Close();

        if (err == KErrNoMemory || err == KErrNoGraphicsMemory)
            qWarning("Not enough memory to cache glyph");
        else if (err != KErrNotFound)
            qWarning("Received error %d from glyph cache", err);
    }
#else
    QVGFontGlyphCache::cacheGlyphs(d, fontEngine, g, count);
#endif
}

QT_END_NAMESPACE