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#include <QtGui/qprintengine.h>

#include <qiodevice.h>

#include <qpainter.h>

#include <qbitmap.h>

#include <qpainterpath.h>

#include <qpaintdevice.h>

#include <qfile.h>

#include <qdebug.h>

#include <qimagewriter.h>

#include <qbuffer.h>

#include <qdatetime.h>

#ifndef QT_NO_PRINTER

#include <limits.h>

#include <math.h>

#ifndef QT_NO_COMPRESS

#include <zlib.h>

#endif

#if defined(Q_OS_WINCE)

#include "qwinfunctions_wince.h"

#endif

#include "qprintengine_pdf_p.h"

#include "private/qdrawhelper_p.h"

QT_BEGIN_NAMESPACE

extern qint64 qt_pixmap_id(const QPixmap &pixmap);

extern qint64 qt_image_id(const QImage &image);

//#define FONT_DUMP

// might be helpful for smooth transforms of images

// Can't use it though, as gs generates completely wrong images if this is true.

static const bool interpolateImages = false;

#ifdef QT_NO_COMPRESS

static const bool do_compress = false;

#else

static const bool do_compress = true;

#endif

QPdfPage::QPdfPage()

    : QPdf::ByteStream(true) // Enable file backing

{

}

void QPdfPage::streamImage(int w, int h, int object)

{

    *this << w << "0 0 " << -h << "0 " << h << "cm /Im" << object << " Do\n";

    if (!images.contains(object))

        images.append(object);

}

inline QPaintEngine::PaintEngineFeatures qt_pdf_decide_features()

{

    QPaintEngine::PaintEngineFeatures f = QPaintEngine::AllFeatures;

    f &= ~(QPaintEngine::PorterDuff | QPaintEngine::PerspectiveTransform

           | QPaintEngine::ObjectBoundingModeGradients

#ifndef USE_NATIVE_GRADIENTS

           | QPaintEngine::LinearGradientFill

#endif

           | QPaintEngine::RadialGradientFill

           | QPaintEngine::ConicalGradientFill);

    return f;

}

QPdfEngine::QPdfEngine(QPrinter::PrinterMode m)

    : QPdfBaseEngine(*new QPdfEnginePrivate(m), qt_pdf_decide_features())

{

    state = QPrinter::Idle;

}

QPdfEngine::~QPdfEngine()

{

}

bool QPdfEngine::begin(QPaintDevice *pdev)

{

    Q_D(QPdfEngine);

    if(!QPdfBaseEngine::begin(pdev)) {

        state = QPrinter::Error;

        return false;

    }

    d->stream->setDevice(d->outDevice);

    d->streampos = 0;

    d->hasPen = true;

    d->hasBrush = false;

    d->clipEnabled = false;

    d->allClipped = false;

    d->xrefPositions.clear();

    d->pageRoot = 0;

    d->catalog = 0;

    d->info = 0;

    d->graphicsState = 0;

    d->patternColorSpace = 0;

    d->pages.clear();

    d->imageCache.clear();

    setActive(true);

    state = QPrinter::Active;

    d->writeHeader();

    newPage();

    return true;

}

bool QPdfEngine::end()

{

    Q_D(QPdfEngine);

    d->writeTail();

    d->stream->unsetDevice();

    QPdfBaseEngine::end();

    setActive(false);

    state = QPrinter::Idle;

    return true;

}

void QPdfEngine::drawPixmap (const QRectF &rectangle, const QPixmap &pixmap, const QRectF &sr)

{

    if (sr.isEmpty() || rectangle.isEmpty() || pixmap.isNull())

        return;

    Q_D(QPdfEngine);

    QBrush b = d->brush;

    QRect sourceRect = sr.toRect();

    QPixmap pm = sourceRect != pixmap.rect() ? pixmap.copy(sourceRect) : pixmap;

    QImage image = pm.toImage();

    bool bitmap = true;

    const int object = d->addImage(image, &bitmap, pm.cacheKey());

    if (object < 0)

        return;

    *d->currentPage << "q\n/GSa gs\n";

    *d->currentPage

        << QPdf::generateMatrix(QTransform(rectangle.width() / sr.width(), 0, 0, rectangle.height() / sr.height(),

                                           rectangle.x(), rectangle.y()) * (d->simplePen ? QTransform() : d->stroker.matrix));

    if (bitmap) {

        // set current pen as d->brush

        d->brush = d->pen.brush();

    }

    setBrush();

    d->currentPage->streamImage(image.width(), image.height(), object);

    *d->currentPage << "Q\n";

    d->brush = b;

}

void QPdfEngine::drawImage(const QRectF &rectangle, const QImage &image, const QRectF &sr, Qt::ImageConversionFlags)

{

    if (sr.isEmpty() || rectangle.isEmpty() || image.isNull())

        return;

    Q_D(QPdfEngine);

    QRect sourceRect = sr.toRect();

    QImage im = sourceRect != image.rect() ? image.copy(sourceRect) : image;

    bool bitmap = true;

    const int object = d->addImage(im, &bitmap, im.cacheKey());

    if (object < 0)

        return;

    *d->currentPage << "q\n/GSa gs\n";

    *d->currentPage

        << QPdf::generateMatrix(QTransform(rectangle.width() / sr.width(), 0, 0, rectangle.height() / sr.height(),

                                           rectangle.x(), rectangle.y()) * (d->simplePen ? QTransform() : d->stroker.matrix));

    setBrush();

    d->currentPage->streamImage(im.width(), im.height(), object);

    *d->currentPage << "Q\n";

}

void QPdfEngine::drawTiledPixmap (const QRectF &rectangle, const QPixmap &pixmap, const QPointF &point)

{

    Q_D(QPdfEngine);

    bool bitmap = (pixmap.depth() == 1);

    QBrush b = d->brush;

    QPointF bo = d->brushOrigin;

    bool hp = d->hasPen;

    d->hasPen = false;

    bool hb = d->hasBrush;

    d->hasBrush = true;

    d->brush = QBrush(pixmap);

    if (bitmap)

        // #### fix bitmap case where we have a brush pen

        d->brush.setColor(d->pen.color());

    d->brushOrigin = -point;

    *d->currentPage << "q\n";

    setBrush();

    drawRects(&rectangle, 1);

    *d->currentPage << "Q\n";

    d->hasPen = hp;

    d->hasBrush = hb;

    d->brush = b;

    d->brushOrigin = bo;

}

void QPdfEngine::setBrush()

{

    Q_D(QPdfEngine);

    Qt::BrushStyle style = d->brush.style();

    if (style == Qt::NoBrush)

        return;

    bool specifyColor;

    int gStateObject = 0;

    int patternObject = d->addBrushPattern(d->stroker.matrix, &specifyColor, &gStateObject);

    *d->currentPage << (patternObject ? "/PCSp cs " : "/CSp cs ");

    if (specifyColor) {

        QColor rgba = d->brush.color();

        if (d->colorMode == QPrinter::GrayScale) {

            qreal gray = qGray(rgba.rgba())/255.;

            *d->currentPage << gray << gray << gray;

        } else {

            *d->currentPage << rgba.redF()

                            << rgba.greenF()

                            << rgba.blueF();

        }

    }

    if (patternObject)

        *d->currentPage << "/Pat" << patternObject;

    *d->currentPage << "scn\n";

    if (gStateObject)

        *d->currentPage << "/GState" << gStateObject << "gs\n";

    else

        *d->currentPage << "/GSa gs\n";

}

QPaintEngine::Type QPdfEngine::type() const

{

    return QPaintEngine::Pdf;

}

bool QPdfEngine::newPage()

{

    Q_D(QPdfEngine);

    if (!isActive())

        return false;

    d->newPage();

    return QPdfBaseEngine::newPage();

}

QPdfEnginePrivate::QPdfEnginePrivate(QPrinter::PrinterMode m)

    : QPdfBaseEnginePrivate(m)

{

    streampos = 0;

    stream = new QDataStream;

    pageOrder = QPrinter::FirstPageFirst;

    orientation = QPrinter::Portrait;

    fullPage = false;

}

QPdfEnginePrivate::~QPdfEnginePrivate()

{

    delete stream;

}

#ifdef USE_NATIVE_GRADIENTS

int QPdfEnginePrivate::gradientBrush(const QBrush &b, const QMatrix &matrix, int *gStateObject)

{

    const QGradient *gradient = b.gradient();

    if (!gradient)

        return 0;

    QTransform inv = matrix.inverted();

    QPointF page_rect[4] = { inv.map(QPointF(0, 0)),

                             inv.map(QPointF(width_, 0)),

                             inv.map(QPointF(0, height_)),

                             inv.map(QPointF(width_, height_)) };

    bool opaque = b.isOpaque();

    QByteArray shader;

    QByteArray alphaShader;

    if (gradient->type() == QGradient::LinearGradient) {

        const QLinearGradient *lg = static_cast<const QLinearGradient *>(gradient);

        shader = QPdf::generateLinearGradientShader(lg, page_rect);

        if (!opaque)

            alphaShader = QPdf::generateLinearGradientShader(lg, page_rect, true);

    } else {

        // #############

        return 0;

    }

    int shaderObject = addXrefEntry(-1);

    write(shader);

    QByteArray str;

    QPdf::ByteStream s(&str);

    s << "<<\n"

        "/Type /Pattern\n"

        "/PatternType 2\n"

        "/Shading " << shaderObject << "0 R\n"

        "/Matrix ["

      << matrix.m11()

      << matrix.m12()

      << matrix.m21()

      << matrix.m22()

      << matrix.dx()

      << matrix.dy() << "]\n";

    s << ">>\n"

        "endobj\n";

    int patternObj = addXrefEntry(-1);

    write(str);

    currentPage->patterns.append(patternObj);

    if (!opaque) {

        bool ca = true;

        QGradientStops stops = gradient->stops();

        int a = stops.at(0).second.alpha();

        for (int i = 1; i < stops.size(); ++i) {

            if (stops.at(i).second.alpha() != a) {

                ca = false;

                break;

            }

        }

        if (ca) {

            *gStateObject = addConstantAlphaObject(stops.at(0).second.alpha());

        } else {

            int alphaShaderObject = addXrefEntry(-1);

            write(alphaShader);

            QByteArray content;

            QPdf::ByteStream c(&content);

            c << "/Shader" << alphaShaderObject << "sh\n";

            QByteArray form;

            QPdf::ByteStream f(&form);

            f << "<<\n"

                "/Type /XObject\n"

                "/Subtype /Form\n"

                "/BBox [0 0 " << width_ << height_ << "]\n"

                "/Group <</S /Transparency >>\n"

                "/Resources <<\n"

                "/Shading << /Shader" << alphaShaderObject << alphaShaderObject << "0 R >>\n"

                ">>\n";

            f << "/Length " << content.length() << "\n"

                ">>\n"

                "stream\n"

              << content

              << "endstream\n"

                "endobj\n";

            int softMaskFormObject = addXrefEntry(-1);

            write(form);

            *gStateObject = addXrefEntry(-1);

            xprintf("<< /SMask << /S /Alpha /G %d 0 R >> >>\n"

                    "endobj\n", softMaskFormObject);

            currentPage->graphicStates.append(*gStateObject);

        }

    }

    return patternObj;

}

#endif

int QPdfEnginePrivate::addConstantAlphaObject(int brushAlpha, int penAlpha)

{

    if (brushAlpha == 255 && penAlpha == 255)

        return 0;

    int object = alphaCache.value(QPair<uint, uint>(brushAlpha, penAlpha), 0);

    if (!object) {

        object = addXrefEntry(-1);

        QByteArray alphaDef;

        QPdf::ByteStream s(&alphaDef);

        s << "<<\n/ca " << (brushAlpha/qreal(255.)) << '\n';

        s << "/CA " << (penAlpha/qreal(255.)) << "\n>>";

        xprintf("%s\nendobj\n", alphaDef.constData());

        alphaCache.insert(QPair<uint, uint>(brushAlpha, penAlpha), object);

    }

    if (currentPage->graphicStates.indexOf(object) < 0)

        currentPage->graphicStates.append(object);

    return object;

}

int QPdfEnginePrivate::addBrushPattern(const QTransform &m, bool *specifyColor, int *gStateObject)

{

    int paintType = 2; // Uncolored tiling

    int w = 8;

    int h = 8;

    *specifyColor = true;

    *gStateObject = 0;

    QTransform matrix = m;

    matrix.translate(brushOrigin.x(), brushOrigin.y());

    matrix = matrix * pageMatrix();

    //qDebug() << brushOrigin << matrix;

    Qt::BrushStyle style = brush.style();

    if (style == Qt::LinearGradientPattern) {// && style <= Qt::ConicalGradientPattern) {

#ifdef USE_NATIVE_GRADIENTS

        *specifyColor = false;

        return gradientBrush(b, matrix, gStateObject);

#else

        return 0;

#endif

    }

    if ((!brush.isOpaque() && brush.style() < Qt::LinearGradientPattern) || opacity != 1.0)

        *gStateObject = addConstantAlphaObject(qRound(brush.color().alpha() * opacity),

                                               qRound(pen.color().alpha() * opacity));

    int imageObject = -1;

    QByteArray pattern = QPdf::patternForBrush(brush);

    if (pattern.isEmpty()) {

        if (brush.style() != Qt::TexturePattern)

            return 0;

        QImage image = brush.texture().toImage();

        bool bitmap = true;

        imageObject = addImage(image, &bitmap, qt_pixmap_id(brush.texture()));

        if (imageObject != -1) {

            QImage::Format f = image.format();

            if (f != QImage::Format_MonoLSB && f != QImage::Format_Mono) {

                paintType = 1; // Colored tiling

                *specifyColor = false;

            }

            w = image.width();

            h = image.height();

            QTransform m(w, 0, 0, -h, 0, h);

            QPdf::ByteStream s(&pattern);

            s << QPdf::generateMatrix(m);

            s << "/Im" << imageObject << " Do\n";

        }

    }

    QByteArray str;

    QPdf::ByteStream s(&str);

    s << "<<\n"

        "/Type /Pattern\n"

        "/PatternType 1\n"

        "/PaintType " << paintType << "\n"

        "/TilingType 1\n"

        "/BBox [0 0 " << w << h << "]\n"

        "/XStep " << w << "\n"

        "/YStep " << h << "\n"

        "/Matrix ["

      << matrix.m11()

      << matrix.m12()

      << matrix.m21()

      << matrix.m22()

      << matrix.dx()

      << matrix.dy() << "]\n"

        "/Resources \n<< "; // open resource tree

    if (imageObject > 0) {

        s << "/XObject << /Im" << imageObject << ' ' << imageObject << "0 R >> ";

    }

    s << ">>\n"

        "/Length " << pattern.length() << "\n"

        ">>\n"

        "stream\n"

      << pattern

      << "endstream\n"

        "endobj\n";

    int patternObj = addXrefEntry(-1);

    write(str);

    currentPage->patterns.append(patternObj);

    return patternObj;

}

/*!

 * Adds an image to the pdf and return the pdf-object id. Returns -1 if adding the image failed.

 */

int QPdfEnginePrivate::addImage(const QImage &img, bool *bitmap, qint64 serial_no)

{

    if (img.isNull())