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#include "svgalibpaintengine.h"

#include <QColor>

#include <vga.h>

#include <vgagl.h>

SvgalibPaintEngine::SvgalibPaintEngine()

{

}

SvgalibPaintEngine::~SvgalibPaintEngine()

{

}

//! [0]

bool SvgalibPaintEngine::begin(QPaintDevice *dev)

{

    device = dev;

    pen = Qt::NoPen;

    simplePen = true;

    brush = Qt::NoBrush;

    simpleBrush = true;

    matrix = QMatrix();

    simpleMatrix = true;

    setClip(QRect(0, 0, device->width(), device->height()));

    opaque = true;

    aliased = true;

    sourceOver = true;

    return QRasterPaintEngine::begin(dev);

}

//! [0]

//! [1]

bool SvgalibPaintEngine::end()

{

    gl_setclippingwindow(0, 0, device->width() - 1, device->height() - 1);

    return QRasterPaintEngine::end();

}

//! [1]

//! [2]

void SvgalibPaintEngine::updateState(const QPaintEngineState &state)

{

    QPaintEngine::DirtyFlags flags = state.state();

    if (flags & DirtyTransform) {

        matrix = state.matrix();

        simpleMatrix = (matrix.m12() == 0 && matrix.m21() == 0);

    }

    if (flags & DirtyPen) {

        pen = state.pen();

        simplePen = (pen.width() == 0 || pen.widthF() <= 1)

                    && (pen.style() == Qt::NoPen || pen.style() == Qt::SolidLine)

                    && (pen.color().alpha() == 255);

    }

    if (flags & DirtyBrush) {

        brush = state.brush();

        simpleBrush = (brush.style() == Qt::SolidPattern

                       || brush.style() == Qt::NoBrush)

                      && (brush.color().alpha() == 255);

    }

    if (flags & DirtyClipRegion)

        setClip(state.clipRegion());

    if (flags & DirtyClipEnabled) {

        clipEnabled = state.isClipEnabled();

        updateClip();

    }

    if (flags & DirtyClipPath) {

        setClip(QRegion());

        simpleClip = false;

    }

    if (flags & DirtyCompositionMode) {

        const QPainter::CompositionMode m = state.compositionMode();

        sourceOver = (m == QPainter::CompositionMode_SourceOver);

    }

    if (flags & DirtyOpacity)

        opaque = (state.opacity() == 256);

    if (flags & DirtyHints)

        aliased = !(state.renderHints() & QPainter::Antialiasing);

    QRasterPaintEngine::updateState(state);

}

//! [2]

//! [3]

void SvgalibPaintEngine::setClip(const QRegion &region)

{

    if (region.isEmpty())

        clip = QRect(0, 0, device->width(), device->height());

    else

        clip = matrix.map(region) & QRect(0, 0, device->width(), device->height());

    clipEnabled = true;

    updateClip();

}

//! [3]

//! [4]

void SvgalibPaintEngine::updateClip()

{

    QRegion clipRegion = QRect(0, 0, device->width(), device->height());

    if (!systemClip().isEmpty())

        clipRegion &= systemClip();

    if (clipEnabled)

        clipRegion &= clip;

    simpleClip = (clipRegion.rects().size() <= 1);

    const QRect r = clipRegion.boundingRect();

    gl_setclippingwindow(r.left(), r.top(),

                         r.x() + r.width(),

                         r.y() + r.height());

}

//! [4]

//! [5]

void SvgalibPaintEngine::drawRects(const QRect *rects, int rectCount)

{

    const bool canAccelerate = simplePen && simpleBrush && simpleMatrix

                               && simpleClip && opaque && aliased

                               && sourceOver;

    if (!canAccelerate) {

        QRasterPaintEngine::drawRects(rects, rectCount);

        return;

    }

    for (int i = 0; i < rectCount; ++i) {

        const QRect r = matrix.mapRect(rects[i]);

        if (brush != Qt::NoBrush) {

            gl_fillbox(r.left(), r.top(), r.width(), r.height(),

                       brush.color().rgba());

        }

        if (pen != Qt::NoPen) {

            const int c = pen.color().rgba();

            gl_hline(r.left(), r.top(), r.right(), c);

            gl_hline(r.left(), r.bottom(), r.right(), c);

            gl_line(r.left(), r.top(), r.left(), r.bottom(), c);

            gl_line(r.right(), r.top(), r.right(), r.bottom(), c);

        }

    }

}

//! [5]