qpaintengine_raster.cpp

奇趣公司比较新的qt/emd版本

                const QPointF &e = m_elements.at(i);
                m_elements_dev << QPointF(e.x() + m_dx, e.y() + m_dy);
            }
        } else if (m_txop == QTransform::TxScale) {
            for (int i=0; i<m_elements.size(); ++i) {
                const QPointF &e = m_elements.at(i);
                m_elements_dev << QPointF(m_m11 * e.x() + m_dx, m_m22 * e.y() + m_dy);
            }
        } else if (m_txop < QTransform::TxProject) {
            for (int i=0; i<m_elements.size(); ++i) {
                const QPointF &e = m_elements.at(i);
                m_elements_dev << QPointF(m_m11 * e.x() + m_m21 * e.y() + m_dx,
                                          m_m22 * e.y() + m_m12 * e.x() + m_dy);
            }
        } else {
            for (int i=0; i<m_elements.size(); ++i) {
                const QPointF &e = m_elements.at(i);
                qreal x = m_m11 * e.x() + m_m21 * e.y() + m_dx;
                qreal y = m_m22 * e.y() + m_m12 * e.x() + m_dy;
                qreal w = m_m13*e.x() + m_m23*e.y() + 1.;
                w = 1/w;
                x *= w;
                y *= w;
                m_elements_dev << QPointF(x, y);
            }
        }
        elements = m_elements_dev.data();
    }

    controlPointRect = boundingRect(elements, element_count);

    // Check for out of dev bounds...
    const bool do_clip = (controlPointRect.left() < -QT_RASTER_COORD_LIMIT
                          || controlPointRect.right() > QT_RASTER_COORD_LIMIT
                          || controlPointRect.top() < -QT_RASTER_COORD_LIMIT
                          || controlPointRect.bottom() > QT_RASTER_COORD_LIMIT);

    if (do_clip) {
        clipElements(elements, m_element_types.data(), element_count);
    } else {
        convertElements(elements, m_element_types.data(), element_count);
    }
}

void QFTOutlineMapper::convertElements(const QPointF *elements,
                                       const QPainterPath::ElementType *types,
                                       int element_count)
{
    // Translate into FT coords
    const QPointF *e = elements;
    for (int i=0; i<element_count; ++i) {
        switch (*types) {
        case QPainterPath::MoveToElement:
            {
                QT_FT_Vector pt_fixed = { qreal_to_fixed_26_6(e->x()),
                                          qreal_to_fixed_26_6(e->y()) };
                if (i != 0)
                    m_contours << m_points.size() - 1;
                m_points << pt_fixed;
                m_tags <<  QT_FT_CURVE_TAG_ON;
            }
            break;

        case QPainterPath::LineToElement:
            {
                QT_FT_Vector pt_fixed = { qreal_to_fixed_26_6(e->x()),
                                          qreal_to_fixed_26_6(e->y()) };
                m_points << pt_fixed;
                m_tags << QT_FT_CURVE_TAG_ON;
            }
            break;

        case QPainterPath::CurveToElement:
            {
                QT_FT_Vector cp1_fixed = { qreal_to_fixed_26_6(e->x()),
                                           qreal_to_fixed_26_6(e->y()) };
                ++e;
                QT_FT_Vector cp2_fixed = { qreal_to_fixed_26_6((e)->x()),
                                           qreal_to_fixed_26_6((e)->y()) };
                ++e;
                QT_FT_Vector ep_fixed = { qreal_to_fixed_26_6((e)->x()),
                                          qreal_to_fixed_26_6((e)->y()) };

                m_points << cp1_fixed << cp2_fixed << ep_fixed;
                m_tags << QT_FT_CURVE_TAG_CUBIC
                       << QT_FT_CURVE_TAG_CUBIC
                       << QT_FT_CURVE_TAG_ON;

                types += 2;
                i += 2;
            }
            break;
        default:
            break;
        }
        ++types;
        ++e;
    }

    // close the very last subpath
    m_contours << m_points.size() - 1;

    m_outline.n_contours = m_contours.size();
    m_outline.n_points = m_points.size();

    m_outline.points = m_points.data();
    m_outline.tags = m_tags.data();
    m_outline.contours = m_contours.data();

#ifdef QT_DEBUG_CONVERT
    printf("QFTOutlineMapper::endOutline\n");

    printf(" - contours: %d\n", m_outline.n_contours);
    for (int i=0; i<m_outline.n_contours; ++i) {
        printf("   - %d\n", m_outline.contours[i]);
    }

    printf(" - points: %d\n", m_outline.n_points);
    for (int i=0; i<m_outline.n_points; ++i) {
        printf("   - %d -- %.2f, %.2f, (%d, %d)\n", i,
               m_outline.points[i].x / 64.0,
               m_outline.points[i].y / 64.0,
               m_outline.points[i], m_outline.points[i]);
    }
#endif
}

void QFTOutlineMapper::clipElements(const QPointF *elements,
                                    const QPainterPath::ElementType *types,
                                    int element_count)
{
    // We could save a bit of time by actually implementing them fully
    // instead of going through convenience functionallity, but since
    // this part of code hardly every used, it shouldn't matter.

    QPainterPath path;
    for (int i=0; i<element_count; ++i) {
        switch (types[i]) {
        case QPainterPath::MoveToElement:
            path.moveTo(elements[i]);
            break;

        case QPainterPath::LineToElement:
            path.lineTo(elements[i]);
            break;

        case QPainterPath::CurveToElement:
            path.cubicTo(elements[i], elements[i+1], elements[i+2]);
            i += 2;
            break;
        default:
            break;
        }
    }

    QPolygonF polygon = path.toFillPolygon();
    QRasterFloatPoint *clipped_points;
    int clipped_count;

    m_clipper.clipPolygon((QRasterFloatPoint *) polygon.constData(), polygon.size(),
                          &clipped_points, &clipped_count, true);

#ifdef QT_DEBUG_CONVERT
    printf(" - shape was clipped\n");
    for (int i=0; i<clipped_count; ++i) {
        printf("   - %.2f, -%.2f\n", clipped_points[i].x(), clipped_points[i].y());
    }
#endif

    if (!clipped_count) {
        m_valid = false;
        return;
    }

    QPainterPath::ElementType *point_types = new QPainterPath::ElementType[clipped_count];
    point_types[0] = QPainterPath::MoveToElement;
    for (int i=0; i<clipped_count; ++i) point_types[i] = QPainterPath::LineToElement;
    convertElements((const QPointF *)clipped_points, point_types, clipped_count);
    delete[] point_types;
}


static void qt_ft_outline_move_to(qfixed x, qfixed y, void *data)
{
    ((QFTOutlineMapper *) data)->moveTo(QPointF(qt_fixed_to_real(x), qt_fixed_to_real(y)));
}

static void qt_ft_outline_line_to(qfixed x, qfixed y, void *data)
{
    ((QFTOutlineMapper *) data)->lineTo(QPointF(qt_fixed_to_real(x), qt_fixed_to_real(y)));
}

static void qt_ft_outline_cubic_to(qfixed c1x, qfixed c1y,
                             qfixed c2x, qfixed c2y,
                             qfixed ex, qfixed ey,
                             void *data)
{
    ((QFTOutlineMapper *) data)->curveTo(QPointF(qt_fixed_to_real(c1x), qt_fixed_to_real(c1y)),
                                         QPointF(qt_fixed_to_real(c2x), qt_fixed_to_real(c2y)),
                                         QPointF(qt_fixed_to_real(ex), qt_fixed_to_real(ey)));
}


#if !defined(QT_NO_DEBUG) && 0
static void qt_debug_path(const QPainterPath &path)
{
    const char *names[] = {
        "MoveTo     ",
        "LineTo     ",
        "CurveTo    ",
        "CurveToData"
    };

    printf("\nQPainterPath: elementCount=%d\n", path.elementCount());
    for (int i=0; i<path.elementCount(); ++i) {
        const QPainterPath::Element &e = path.elementAt(i);
        Q_ASSERT(e.type >= 0 && e.type <= QPainterPath::CurveToDataElement);
        printf(" - %3d:: %s, (%.2f, %.2f)\n", i, names[e.type], e.x, e.y);
    }
}
#endif

static inline bool needsResolving(QSpanData *data)
{
    return ((data->type == QSpanData::LinearGradient ||
             data->type == QSpanData::RadialGradient ||
             data->type == QSpanData::ConicalGradient) &&
            data->gradient.needsResolving);
}

static inline void resolveGradientBounds(const QRectF &rect, QSpanData *data)
{
    GradientData &gradient = data->gradient;
    switch(data->type) {
    case QSpanData::LinearGradient: {
        gradient.linear.origin.x = rect.x() + rect.width()  * gradient.unresolvedLinear.origin.x;
        gradient.linear.origin.y = rect.y() + rect.height() * gradient.unresolvedLinear.origin.y;
        gradient.linear.end.x =    rect.x() + rect.width()  * gradient.unresolvedLinear.end.x;
        gradient.linear.end.y =    rect.y() + rect.height() * gradient.unresolvedLinear.end.y;
        break;
    }
    case QSpanData::RadialGradient: {
        gradient.radial.center.x = rect.x() + rect.width() * gradient.unresolvedRadial.center.x;
        gradient.radial.center.y = rect.y() + rect.height() * gradient.unresolvedRadial.center.y;
        gradient.radial.focal.x = rect.x() + rect.width() * gradient.unresolvedRadial.focal.x;
        gradient.radial.focal.y = rect.y() + rect.height() * gradient.unresolvedRadial.focal.y;
        gradient.radial.radius = qMin(rect.x() + rect.width() * gradient.unresolvedRadial.radius,
                                      rect.y() + rect.height() * gradient.unresolvedRadial.radius);
        break;
    }
    case QSpanData::ConicalGradient:
        gradient.conical.center.x = rect.x() + rect.width() * gradient.unresolvedConical.center.x;
        gradient.conical.center.y = rect.y() + rect.height() * gradient.unresolvedConical.center.y;
        gradient.conical.angle = gradient.unresolvedConical.angle;
        break;
    default:
        break;
    }
}

// use this when there's no overhead in computing the rectangle
static inline void resolveGradientBoundsConditional(const QRectF &rect, QSpanData *data)
{
    if (data->blend && needsResolving(data))
        resolveGradientBounds(rect, data);
}

/*!
    \class QRasterPaintEngine
    \preliminary
    \ingroup qws
    \since 4.2

    \brief The QRasterPaintEngine class enables hardware acceleration
    of painting operations in Qtopia Core.

    Note that this functionality is only available in \l {Qtopia
    Core}.

    In \l {Qtopia Core}, painting is a pure software
    implementation. But starting with \l{Qtopia Core} 4.2, it is
    possible to add an accelerated graphics driver to take advantage
    of available hardware resources.

    Hardware acceleration is accomplished by creating a custom screen
    driver, accelerating the copying from memory to the screen, and
    implementing a custom paint engine accelerating the various
    painting operations. Then a custom paint device (derived from the
    QCustomRasterPaintDevice class) and a custom window surface
    (derived from QWSWindowSurface) must be implemented to make \l
    {Qtopia Core} aware of the accelerated driver.

    \note The QRasterPaintEngine class does not support 8-bit images.
    Instead, they need to be converted to a supported format, such as
    QImage::Format_ARGB32_Premultiplied.

    See the \l {Adding an Accelerated Graphics Driver in Qtopia Core}
    documentation for details.

    \sa QCustomRasterPaintDevice, QPaintEngine
*/

/*!
    \fn Type QRasterPaintEngine::type() const
    \reimp
*/

/*!
    \typedef QSpan
    \relates QRasterPaintEngine

    A struct equivalent to QT_FT_Span, containing a position (x,
    y), the span's length in pixels and its color/coverage (a value
    ranging from 0 to 255).
*/

/*!
    Creates a raster based paint engine with the complete set of \l
    {QPaintEngine::PaintEngineFeature}{paint engine features and
    capabilities}.
*/
QRasterPaintEngine::QRasterPaintEngine()
    : QPaintEngine(*(new QRasterPaintEnginePrivate),
                   QPaintEngine::PaintEngineFeatures(AllFeatures)
        )
{
    init();
}

/*!
    \internal
*/
QRasterPaintEngine::QRasterPaintEngine(QRasterPaintEnginePrivate &dd)
    : QPaintEngine(dd, QPaintEngine::PaintEngineFeatures(AllFeatures))
{
    init();
}

void QRasterPaintEngine::init()
{
    Q_D(QRasterPaintEngine);

    d->rasterPoolSize = 4096;
    d->rasterPoolBase =
#if defined(Q_WS_WIN64)
        (unsigned char *) _aligned_malloc(d->rasterPoolSize, __alignof(void*));
#else
        (unsigned char *) malloc(d->rasterPoolSize);
#endif

    // The antialiasing raster.
    d->grayRaster = new QT_FT_Raster;
    qt_ft_grays_raster.raster_new(0, d->grayRaster);
    qt_ft_grays_raster.raster_reset(*d->grayRaster, d->rasterPoolBase, d->rasterPoolSize);

    // Initialize the standard raster.
    d->blackRaster = new QT_FT_Raster;
    qt_ft_standard_raster.raster_new(0, d->blackRaster);
    qt_ft_standard_raster.raster_reset(*d->blackRaster, d->rasterPoolBase, d->rasterPoolSize);

    d->rasterBuffer = new QRasterBuffer();
#ifdef Q_WS_WIN
    d->fontRasterBuffer = new QRasterBuffer();
#endif
    d->outlineMapper = new QFTOutlineMapper;

    d->dashStroker = 0;

    d->flushOnEnd = true;

    d->basicStroker.setMoveToHook(qt_ft_outline_move_to);
    d->basicStroker.setLineToHook(qt_ft_outline_line_to);
    d->basicStroker.setCubicToHook(qt_ft_outline_cubic_to);
    d->dashStroker = 0;
}

/*!
    Destroys this paint engine.
*/
QRasterPaintEngine::~QRasterPaintEngine()
{
    Q_D(QRasterPaintEngine);

#if defined(Q_WS_WIN64)
    _aligned_free(d->rasterPoolBase);
#else
    free(d->rasterPoolBase);
#endif

    qt_ft_grays_raster.raster_done(*d->grayRaster);
    delete d->grayRaster;

    qt_ft_standard_raster.raster_done(*d->blackRaster);
    delete d->blackRaster;