/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of the QtQuick module of the Qt Toolkit.
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** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
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****************************************************************************/

#include "qquickpathitemsoftwarerenderer_p.h"
#include <private/qquickpath_p_p.h>

QT_BEGIN_NAMESPACE

void QQuickPathItemSoftwareRenderer::beginSync(int totalCount)
{
    if (m_vp.count() != totalCount) {
        m_vp.resize(totalCount);
        m_accDirty |= DirtyList;
    }
}

void QQuickPathItemSoftwareRenderer::setPath(int index, const QQuickPath *path)
{
    VisualPathGuiData &d(m_vp[index]);
    d.path = path ? path->path() : QPainterPath();
    d.dirty |= DirtyPath;
    m_accDirty |= DirtyPath;
}

void QQuickPathItemSoftwareRenderer::setStrokeColor(int index, const QColor &color)
{
    VisualPathGuiData &d(m_vp[index]);
    d.pen.setColor(color);
    d.dirty |= DirtyPen;
    m_accDirty |= DirtyPen;
}

void QQuickPathItemSoftwareRenderer::setStrokeWidth(int index, qreal w)
{
    VisualPathGuiData &d(m_vp[index]);
    d.strokeWidth = w;
    if (w >= 0.0f)
        d.pen.setWidthF(w);
    d.dirty |= DirtyPen;
    m_accDirty |= DirtyPen;
}

void QQuickPathItemSoftwareRenderer::setFillColor(int index, const QColor &color)
{
    VisualPathGuiData &d(m_vp[index]);
    d.fillColor = color;
    d.brush.setColor(color);
    d.dirty |= DirtyBrush;
    m_accDirty |= DirtyBrush;
}

void QQuickPathItemSoftwareRenderer::setFillRule(int index, QQuickVisualPath::FillRule fillRule)
{
    VisualPathGuiData &d(m_vp[index]);
    d.fillRule = Qt::FillRule(fillRule);
    d.dirty |= DirtyFillRule;
    m_accDirty |= DirtyFillRule;
}

void QQuickPathItemSoftwareRenderer::setJoinStyle(int index, QQuickVisualPath::JoinStyle joinStyle, int miterLimit)
{
    VisualPathGuiData &d(m_vp[index]);
    d.pen.setJoinStyle(Qt::PenJoinStyle(joinStyle));
    d.pen.setMiterLimit(miterLimit);
    d.dirty |= DirtyPen;
    m_accDirty |= DirtyPen;
}

void QQuickPathItemSoftwareRenderer::setCapStyle(int index, QQuickVisualPath::CapStyle capStyle)
{
    VisualPathGuiData &d(m_vp[index]);
    d.pen.setCapStyle(Qt::PenCapStyle(capStyle));
    d.dirty |= DirtyPen;
    m_accDirty |= DirtyPen;
}

void QQuickPathItemSoftwareRenderer::setStrokeStyle(int index, QQuickVisualPath::StrokeStyle strokeStyle,
                                                    qreal dashOffset, const QVector<qreal> &dashPattern)
{
    VisualPathGuiData &d(m_vp[index]);
    switch (strokeStyle) {
    case QQuickVisualPath::SolidLine:
        d.pen.setStyle(Qt::SolidLine);
        break;
    case QQuickVisualPath::DashLine:
        d.pen.setStyle(Qt::CustomDashLine);
        d.pen.setDashPattern(dashPattern);
        d.pen.setDashOffset(dashOffset);
        break;
    default:
        break;
    }
    d.dirty |= DirtyPen;
    m_accDirty |= DirtyPen;
}

void QQuickPathItemSoftwareRenderer::setFillGradient(int index, QQuickPathGradient *gradient)
{
    VisualPathGuiData &d(m_vp[index]);
    if (QQuickPathLinearGradient *linearGradient = qobject_cast<QQuickPathLinearGradient *>(gradient)) {
        QLinearGradient painterGradient(linearGradient->x1(), linearGradient->y1(),
                                        linearGradient->x2(), linearGradient->y2());
        painterGradient.setStops(linearGradient->sortedGradientStops());
        switch (gradient->spread()) {
        case QQuickPathGradient::PadSpread:
            painterGradient.setSpread(QGradient::PadSpread);
            break;
        case QQuickPathGradient::RepeatSpread:
            painterGradient.setSpread(QGradient::RepeatSpread);
            break;
        case QQuickPathGradient::ReflectSpread:
            painterGradient.setSpread(QGradient::ReflectSpread);
            break;
        default:
            break;
        }
        d.brush = QBrush(painterGradient);
    } else {
        d.brush = QBrush(d.fillColor);
    }
    d.dirty |= DirtyBrush;
    m_accDirty |= DirtyBrush;
}

void QQuickPathItemSoftwareRenderer::endSync(bool)
{
}

void QQuickPathItemSoftwareRenderer::setNode(QQuickPathItemSoftwareRenderNode *node)
{
    if (m_node != node) {
        m_node = node;
        m_accDirty |= DirtyList;
    }
}

void QQuickPathItemSoftwareRenderer::updateNode()
{
    if (!m_accDirty)
        return;

    const int count = m_vp.count();
    const bool listChanged = m_accDirty & DirtyList;
    if (listChanged)
        m_node->m_vp.resize(count);

    m_node->m_boundingRect = QRectF();

    for (int i = 0; i < count; ++i) {
        VisualPathGuiData &src(m_vp[i]);
        QQuickPathItemSoftwareRenderNode::VisualPathRenderData &dst(m_node->m_vp[i]);

        if (listChanged || (src.dirty & DirtyPath)) {
            dst.path = src.path;
            dst.path.setFillRule(src.fillRule);
        }

        if (listChanged || (src.dirty & DirtyFillRule))
            dst.path.setFillRule(src.fillRule);

        if (listChanged || (src.dirty & DirtyPen)) {
            dst.pen = src.pen;
            dst.strokeWidth = src.strokeWidth;
        }

        if (listChanged || (src.dirty & DirtyBrush))
            dst.brush = src.brush;

        src.dirty = 0;

        QRectF br = dst.path.boundingRect();
        const float sw = qMax(1.0f, dst.strokeWidth);
        br.adjust(-sw, -sw, sw, sw);
        m_node->m_boundingRect |= br;
    }

    m_node->markDirty(QSGNode::DirtyMaterial);
    m_accDirty = 0;
}

QQuickPathItemSoftwareRenderNode::QQuickPathItemSoftwareRenderNode(QQuickPathItem *item)
    : m_item(item)
{
}

QQuickPathItemSoftwareRenderNode::~QQuickPathItemSoftwareRenderNode()
{
    releaseResources();
}

void QQuickPathItemSoftwareRenderNode::releaseResources()
{
}

void QQuickPathItemSoftwareRenderNode::render(const RenderState *state)
{
    if (m_vp.isEmpty())
        return;

    QSGRendererInterface *rif = m_item->window()->rendererInterface();
    QPainter *p = static_cast<QPainter *>(rif->getResource(m_item->window(), QSGRendererInterface::PainterResource));
    Q_ASSERT(p);

    const QRegion *clipRegion = state->clipRegion();
    if (clipRegion && !clipRegion->isEmpty())
        p->setClipRegion(*clipRegion, Qt::ReplaceClip); // must be done before setTransform

    p->setTransform(matrix()->toTransform());
    p->setOpacity(inheritedOpacity());

    for (const VisualPathRenderData &d : qAsConst(m_vp)) {
        p->setPen(d.strokeWidth >= 0.0f && d.pen.color() != Qt::transparent ? d.pen : Qt::NoPen);
        p->setBrush(d.brush.color() != Qt::transparent ? d.brush : Qt::NoBrush);
        p->drawPath(d.path);
    }
}

QSGRenderNode::StateFlags QQuickPathItemSoftwareRenderNode::changedStates() const
{
    return 0;
}

QSGRenderNode::RenderingFlags QQuickPathItemSoftwareRenderNode::flags() const
{
    return BoundedRectRendering; // avoid fullscreen updates by saying we won't draw outside rect()
}

QRectF QQuickPathItemSoftwareRenderNode::rect() const
{
    return m_boundingRect;
}

QT_END_NAMESPACE