qpainter.cpp File Reference

#include <qdebug.h>
#include <qmath.h>
#include <qmutex.h>
#include "qbitmap.h"
#include "qimage.h"
#include "qpaintdevice.h"
#include "qpaintengine.h"
#include "qpainter.h"
#include "qpainter_p.h"
#include "qpainterpath.h"
#include "qpicture.h"
#include "qpixmapcache.h"
#include "qpolygon.h"
#include "qtextlayout.h"
#include "qwidget.h"
#include "qapplication.h"
#include "qstyle.h"
#include "qthread.h"
#include "qvarlengtharray.h"
#include "qstatictext.h"
#include "qglyphrun.h"
#include <private/qfontengine_p.h>
#include <private/qpaintengine_p.h>
#include <private/qemulationpaintengine_p.h>
#include <private/qpainterpath_p.h>
#include <private/qtextengine_p.h>
#include <private/qwidget_p.h>
#include <private/qpaintengine_raster_p.h>
#include <private/qmath_p.h>
#include <private/qstatictext_p.h>
#include <private/qglyphrun_p.h>
#include <private/qstylehelper_p.h>
#include <private/qrawfont_p.h>

Go to the source code of this file.

Classes
struct	QPaintDeviceRedirection

Macros
#define	QGradient_StretchToDevice   0x10000000
#define	QPaintEngine_OpaqueBackground   0x40000000

Typedefs
typedef QList< QPaintDeviceRedirection >	QPaintDeviceRedirectionList

Functions
static bool	check_gradient (const QBrush &brush)
static QGradient::CoordinateMode	coordinateMode (const QBrush &brush)
static void	drawTextItemDecoration (QPainter *painter, const QPointF &pos, const QFontEngine *fe, QTextCharFormat::UnderlineStyle underlineStyle, QTextItem::RenderFlags flags, qreal width, const QTextCharFormat &charFormat)
static QPixmap	generateWavyPixmap (qreal maxRadius, const QPen &pen)
static bool	is_brush_transparent (const QBrush &brush)
static bool	is_pen_transparent (const QPen &pen)
static uint	line_emulation (uint emulation)
static bool	needsResolving (const QBrush &brush)
bool	qHasPixmapTexture (const QBrush &)
static void	qt_cleanup_painter_state (QPainterPrivate *d)
Q_GUI_EXPORT void	qt_draw_decoration_for_glyphs (QPainter *painter, const glyph_t *glyphArray, const QFixedPoint *positions, int glyphCount, QFontEngine *fontEngine, const QFont &font, const QTextCharFormat &charFormat)
void	qt_draw_helper (QPainterPrivate *p, const QPainterPath &path, QPainterPrivate::DrawOperation operation)
void	qt_format_text (const QFont &font, const QRectF &_r, int tf, const QTextOption *option, const QString &str, QRectF *brect, int tabstops, int *tabarray, int tabarraylen, QPainter *painter)
void	qt_format_text (const QFont &fnt, const QRectF &_r, int tf, const QString &str, QRectF *brect, int tabstops, int *ta, int tabarraylen, QPainter *painter)
Q_GUI_EXPORT bool	qt_isExtendedRadialGradient (const QBrush &brush)
void	qt_painter_removePaintDevice (QPaintDevice *dev)
static bool	qt_painter_thread_test (int devType, const char *what, bool extraCondition=false)
QPixmap	qt_pixmapForBrush (int style, bool invert)
Q_AUTOTEST_EXPORT QPainterPath	qt_regionToPath (const QRegion &region)
static QPointF	roundInDeviceCoordinates (const QPointF &p, const QTransform &m)
static QBrush	stretchGradientToUserSpace (const QBrush &brush, const QRectF &boundingRect)

Macro Definition Documentation

QGradient_StretchToDevice

#define QGradient_StretchToDevice   0x10000000

Definition at line 82 of file qpainter.cpp.

Referenced by QPainterPrivate::draw_helper(), line_emulation(), and QPainterPrivate::updateEmulationSpecifier().

QPaintEngine_OpaqueBackground

#define QPaintEngine_OpaqueBackground   0x40000000

Definition at line 83 of file qpainter.cpp.

Referenced by QPainterPrivate::draw_helper(), line_emulation(), and QPainterPrivate::updateEmulationSpecifier().

Typedef Documentation

QPaintDeviceRedirectionList

typedef QList<QPaintDeviceRedirection> QPaintDeviceRedirectionList

Definition at line 8262 of file qpainter.cpp.

Function Documentation

check_gradient()

static bool check_gradient ( const QBrush &  brush )

inlinestatic

Definition at line 120 of file qpainter.cpp.

{
    return coordinateMode(brush) == QGradient::StretchToDeviceMode;
}

coordinateMode()

static QGradient::CoordinateMode coordinateMode ( const QBrush &  brush )

inlinestatic

Definition at line 106 of file qpainter.cpp.

Referenced by check_gradient(), QPainterPrivate::drawStretchedGradient(), QGradient::spread(), and QPainterPrivate::updateEmulationSpecifier().

{
    switch (brush.style()) {
    case Qt::LinearGradientPattern:
    case Qt::RadialGradientPattern:
    case Qt::ConicalGradientPattern:
        return brush.gradient()->coordinateMode();
    default:
        ;
    }
    return QGradient::LogicalMode;
}

drawTextItemDecoration()

static void drawTextItemDecoration ( QPainter *  painter, const QPointF &  pos, const QFontEngine *  fe, QTextCharFormat::UnderlineStyle  underlineStyle, QTextItem::RenderFlags  flags, qreal  width, const QTextCharFormat &  charFormat  )

static

Definition at line 6738 of file qpainter.cpp.

Referenced by QPainterPrivate::drawGlyphs(), QPainter::drawTextItem(), and qt_draw_decoration_for_glyphs().

{
    if (underlineStyle == QTextCharFormat::NoUnderline
        && !(flags & (QTextItem::StrikeOut | QTextItem::Overline)))
        return;

    const QPen oldPen = painter->pen();
    const QBrush oldBrush = painter->brush();
    painter->setBrush(Qt::NoBrush);
    QPen pen = oldPen;
    pen.setStyle(Qt::SolidLine);
    pen.setWidthF(fe->lineThickness().toReal());
    pen.setCapStyle(Qt::FlatCap);

    QLineF line(pos.x(), pos.y(), pos.x() + qFloor(width), pos.y());

    qreal underlineOffset = fe->underlinePosition().toReal();
    qreal y = pos.y();
    // compensate for different rounding rule in Core Graphics paint engine,
    // ideally code like this should be moved to respective engines.
    if (painter->paintEngine()->type() == QPaintEngine::CoreGraphics) {
        y = qCeil(y);
    }
    // deliberately ceil the offset to avoid the underline coming too close to
    // the text above it.
    const qreal underlinePos = y + qCeil(underlineOffset);

    if (underlineStyle == QTextCharFormat::SpellCheckUnderline) {
        underlineStyle = QTextCharFormat::UnderlineStyle(QApplication::style()->styleHint(QStyle::SH_SpellCheckUnderlineStyle));
    }

    if (underlineStyle == QTextCharFormat::WaveUnderline) {
        painter->save();
        painter->translate(0, pos.y() + 1);

        QColor uc = charFormat.underlineColor();
        if (uc.isValid())
            pen.setColor(uc);

        // Adapt wave to underlineOffset or pen width, whatever is larger, to make it work on all platforms
        const QPixmap wave = generateWavyPixmap(qMax(underlineOffset, pen.widthF()), pen);
        const int descent = (int) fe->descent().toReal();

        painter->setBrushOrigin(painter->brushOrigin().x(), 0);
        painter->fillRect(pos.x(), 0, qCeil(width), qMin(wave.height(), descent), wave);
        painter->restore();
    } else if (underlineStyle != QTextCharFormat::NoUnderline) {
        QLineF underLine(line.x1(), underlinePos, line.x2(), underlinePos);

        QColor uc = charFormat.underlineColor();
        if (uc.isValid())
            pen.setColor(uc);

        pen.setStyle((Qt::PenStyle)(underlineStyle));
        painter->setPen(pen);
        painter->drawLine(underLine);
    }

    pen.setStyle(Qt::SolidLine);
    pen.setColor(oldPen.color());

    if (flags & QTextItem::StrikeOut) {
        QLineF strikeOutLine = line;
        strikeOutLine.translate(0., - fe->ascent().toReal() / 3.);
        painter->setPen(pen);
        painter->drawLine(strikeOutLine);
    }

    if (flags & QTextItem::Overline) {
        QLineF overLine = line;
        overLine.translate(0., - fe->ascent().toReal());
        painter->setPen(pen);
        painter->drawLine(overLine);
    }

    painter->setPen(oldPen);
    painter->setBrush(oldBrush);
}

generateWavyPixmap()

static QPixmap generateWavyPixmap ( qreal  maxRadius, const QPen &  pen  )

static

Definition at line 6687 of file qpainter.cpp.

Referenced by drawTextItemDecoration().

{
    const qreal radiusBase = qMax(qreal(1), maxRadius);

    QString key = QLatin1Literal("WaveUnderline-")
                  % pen.color().name()
                  % HexString<qreal>(radiusBase);

    QPixmap pixmap;
    if (QPixmapCache::find(key, pixmap))
        return pixmap;

    const qreal halfPeriod = qMax(qreal(2), qreal(radiusBase * 1.61803399)); // the golden ratio
    const int width = qCeil(100 / (2 * halfPeriod)) * (2 * halfPeriod);
    const int radius = qFloor(radiusBase);

    QPainterPath path;

    qreal xs = 0;
    qreal ys = radius;

    while (xs < width) {
        xs += halfPeriod;
        ys = -ys;
        path.quadTo(xs - halfPeriod / 2, ys, xs, 0);
    }

    pixmap = QPixmap(width, radius * 2);
    pixmap.fill(Qt::transparent);
    {
        QPen wavePen = pen;
        wavePen.setCapStyle(Qt::SquareCap);

        // This is to protect against making the line too fat, as happens on Mac OS X
        // due to it having a rather thick width for the regular underline.
        const qreal maxPenWidth = .8 * radius;
        if (wavePen.widthF() > maxPenWidth)
            wavePen.setWidth(maxPenWidth);

        QPainter imgPainter(&pixmap);
        imgPainter.setPen(wavePen);
        imgPainter.setRenderHint(QPainter::Antialiasing);
        imgPainter.translate(0, radius);
        imgPainter.drawPath(path);
    }

    QPixmapCache::insert(key, pixmap);

    return pixmap;
}

is_brush_transparent()

static bool is_brush_transparent ( const QBrush &  brush )

inlinestatic

Definition at line 127 of file qpainter.cpp.

Referenced by is_pen_transparent(), and QPainterPrivate::updateEmulationSpecifier().

                                                             {
    Qt::BrushStyle s = brush.style();
    bool brushBitmap = qHasPixmapTexture(brush)
                       ? brush.texture().isQBitmap()
                       : (brush.textureImage().depth() == 1);
    return ((s >= Qt::Dense1Pattern && s <= Qt::DiagCrossPattern)
            || (s == Qt::TexturePattern && brushBitmap));
}

is_pen_transparent()

static bool is_pen_transparent ( const QPen &  pen )

inlinestatic

Definition at line 136 of file qpainter.cpp.

Referenced by QPainterPrivate::updateEmulationSpecifier().

                                                       {
    return pen.style() > Qt::SolidLine || is_brush_transparent(pen.brush());
}

line_emulation()

static uint line_emulation ( uint  emulation )

inlinestatic

Definition at line 143 of file qpainter.cpp.

Referenced by QPainter::drawLines(), and QPainter::drawPolyline().

{
    return emulation & (QPaintEngine::PrimitiveTransform
                        | QPaintEngine::AlphaBlend
                        | QPaintEngine::Antialiasing
                        | QPaintEngine::BrushStroke
                        | QPaintEngine::ConstantOpacity
                        | QGradient_StretchToDevice
                        | QPaintEngine::ObjectBoundingModeGradients
                        | QPaintEngine_OpaqueBackground);
}

needsResolving()

static bool needsResolving ( const QBrush &  brush )

inlinestatic

Definition at line 7339 of file qpainter.cpp.

Referenced by QPaintEngineState::brushNeedsResolving(), QPaintEngineState::penNeedsResolving(), and QOpenGLPaintEnginePrivate::setGLBrush().

{
    Qt::BrushStyle s = brush.style();
    return ((s == Qt::LinearGradientPattern || s == Qt::RadialGradientPattern ||
             s == Qt::ConicalGradientPattern) &&
            brush.gradient()->coordinateMode() == QGradient::ObjectBoundingMode);
}

qHasPixmapTexture()

bool qHasPixmapTexture

(

const QBrush &

)

Definition at line 223 of file qbrush.cpp.

Referenced by check_gradient(), is_brush_transparent(), and QPainterPrivate::updateEmulationSpecifier().

{
    if (brush.style() != Qt::TexturePattern)
        return false;
    QTexturedBrushData *tx_data = static_cast<QTexturedBrushData *>(brush.d.data());
    return tx_data->m_has_pixmap_texture;
}

qt_cleanup_painter_state()

static void qt_cleanup_painter_state ( QPainterPrivate *  d )

inlinestatic

Definition at line 1714 of file qpainter.cpp.

Referenced by QPainter::begin(), and QPainter::end().

{
    d->states.clear();
    delete d->state;
    d->state = 0;
    d->engine = 0;
    d->device = 0;
}

qt_draw_decoration_for_glyphs()

Q_GUI_EXPORT void qt_draw_decoration_for_glyphs	(	QPainter *	painter,
		const glyph_t *	glyphArray,
		const QFixedPoint *	positions,
		int	glyphCount,
		QFontEngine *	fontEngine,
		const QFont &	font,
		const QTextCharFormat &	charFormat
	)

Definition at line 6820 of file qpainter.cpp.

Referenced by QDeclarativeTextLayout::draw(), QPainter::drawStaticText(), and QDeclarativeTextLayout::prepare().

{
    if (!(font.underline() || font.strikeOut() || font.overline()))
        return;

    QFixed leftMost;
    QFixed rightMost;
    QFixed baseLine;
    for (int i=0; i<glyphCount; ++i) {
        glyph_metrics_t gm = fontEngine->boundingBox(glyphArray[i]);
        if (i == 0 || leftMost > positions[i].x)
            leftMost = positions[i].x;

        // We don't support glyphs that do not share a common baseline. If this turns out to
        // be a relevant use case, then we need to find clusters of glyphs that share a baseline
        // and do a drawTextItemDecorations call per cluster.
        if (i == 0 || baseLine < positions[i].y)
            baseLine = positions[i].y;

        // We use the advance rather than the actual bounds to match the algorithm in drawText()
        if (i == 0 || rightMost < positions[i].x + gm.xoff)
            rightMost = positions[i].x + gm.xoff;
    }

    QFixed width = rightMost - leftMost;
    QTextItem::RenderFlags flags = 0;

    if (font.underline())
        flags |= QTextItem::Underline;
    if (font.overline())
        flags |= QTextItem::Overline;
    if (font.strikeOut())
        flags |= QTextItem::StrikeOut;

    drawTextItemDecoration(painter, QPointF(leftMost.toReal(), baseLine.toReal()),
                           fontEngine,
                           font.underline() ? QTextCharFormat::SingleUnderline
                                            : QTextCharFormat::NoUnderline, flags,
                           width.toReal(), charFormat);
}

qt_draw_helper()

void qt_draw_helper	(	QPainterPrivate *	p,
		const QPainterPath &	path,
		QPainterPrivate::DrawOperation	operation
	)

Definition at line 9937 of file qpainter.cpp.

Referenced by QVGPaintEngine::fill(), and QOpenGLPaintEngine::fill().

{
    p->draw_helper(path, operation);
}

qt_format_text() [1/2]

void qt_format_text	(	const QFont &	font,
		const QRectF &	_r,
		int	tf,
		const QTextOption *	option,
		const QString &	str,
		QRectF *	brect,
		int	tabstops,
		int *	tabarray,
		int	tabarraylen,
		QPainter *	painter
	)

Definition at line 8458 of file qpainter.cpp.

Referenced by QPainter::boundingRect(), QPainter::drawText(), QPicture::exec(), QPainterReplayer::process(), and qt_format_text().

{

    Q_ASSERT( !((tf & ~Qt::TextDontPrint)!=0 && option!=0) ); // we either have an option or flags

    if (option) {
        tf |= option->alignment();
        if (option->wrapMode() != QTextOption::NoWrap)
            tf |= Qt::TextWordWrap;

        if (option->flags() & QTextOption::IncludeTrailingSpaces)
            tf |= Qt::TextIncludeTrailingSpaces;

        if (option->tabStop() >= 0 || !option->tabArray().isEmpty())
            tf |= Qt::TextExpandTabs;
    }

    // we need to copy r here to protect against the case (&r == brect).
    QRectF r(_r);

    bool dontclip  = (tf & Qt::TextDontClip);
    bool wordwrap  = (tf & Qt::TextWordWrap) || (tf & Qt::TextWrapAnywhere);
    bool singleline = (tf & Qt::TextSingleLine);
    bool showmnemonic = (tf & Qt::TextShowMnemonic);
    bool hidemnmemonic = (tf & Qt::TextHideMnemonic);

    Qt::LayoutDirection layout_direction;
    if (tf & Qt::TextForceLeftToRight)
        layout_direction = Qt::LeftToRight;
    else if (tf & Qt::TextForceRightToLeft)
        layout_direction = Qt::RightToLeft;
    else if (option)
        layout_direction = option->textDirection();
    else if (painter)
        layout_direction = painter->layoutDirection();
    else
        layout_direction = Qt::LeftToRight;

    tf = QStyle::visualAlignment(layout_direction, QFlag(tf));

    bool isRightToLeft = layout_direction == Qt::RightToLeft;
    bool expandtabs = ((tf & Qt::TextExpandTabs) &&
                        (((tf & Qt::AlignLeft) && !isRightToLeft) ||
                          ((tf & Qt::AlignRight) && isRightToLeft)));

    if (!painter)
        tf |= Qt::TextDontPrint;

    uint maxUnderlines = 0;
    int numUnderlines = 0;
    QVarLengthArray<int, 32> underlinePositions(1);

    QFontMetricsF fm(fnt);
    QString text = str;
    int offset = 0;
start_lengthVariant:
    bool hasMoreLengthVariants = false;
    // compatible behaviour to the old implementation. Replace
    // tabs by spaces
    int old_offset = offset;
    for (; offset < text.length(); offset++) {
        QChar chr = text.at(offset);
        if (chr == QLatin1Char('\r') || (singleline && chr == QLatin1Char('\n'))) {
            text[offset] = QLatin1Char(' ');
        } else if (chr == QLatin1Char('\n')) {
            text[offset] = QChar::LineSeparator;
        } else if (chr == QLatin1Char('&')) {
            ++maxUnderlines;
        } else if (chr == QLatin1Char('\t')) {
            if (!expandtabs) {
                text[offset] = QLatin1Char(' ');
            } else if (!tabarraylen && !tabstops) {
                tabstops = qRound(fm.width(QLatin1Char('x'))*8);
            }
        } else if (chr == QChar(ushort(0x9c))) {
            // string with multiple length variants
            hasMoreLengthVariants = true;
            break;
        }
    }

    int length = offset - old_offset;
    if ((hidemnmemonic || showmnemonic) && maxUnderlines > 0) {
        underlinePositions.resize(maxUnderlines + 1);

        QChar *cout = text.data() + old_offset;
        QChar *cin = cout;
        int l = length;
        while (l) {
            if (*cin == QLatin1Char('&')) {
                ++cin;
                --length;
                --l;
                if (!l)
                    break;
                if (*cin != QLatin1Char('&') && !hidemnmemonic)
                    underlinePositions[numUnderlines++] = cout - text.data() - old_offset;
            }
            *cout = *cin;
            ++cout;
            ++cin;
            --l;
        }
    }

    // no need to do extra work for underlines if we don't paint
    if (tf & Qt::TextDontPrint)
        numUnderlines = 0;

    underlinePositions[numUnderlines] = -1;
    qreal height = 0;
    qreal width = 0;

    QString finalText = text.mid(old_offset, length);
    QStackTextEngine engine(finalText, fnt);
    if (option) {
        engine.option = *option;
    }

    if (engine.option.tabStop() < 0 && tabstops > 0)
        engine.option.setTabStop(tabstops);

    if (engine.option.tabs().isEmpty() && ta) {
        QList<qreal> tabs;
        for (int i = 0; i < tabarraylen; i++)
            tabs.append(qreal(ta[i]));
        engine.option.setTabArray(tabs);
    }

    engine.option.setTextDirection(layout_direction);
    if (tf & Qt::AlignJustify)
        engine.option.setAlignment(Qt::AlignJustify);
    else
        engine.option.setAlignment(Qt::AlignLeft); // do not do alignment twice

    if (!option && (tf & Qt::TextWrapAnywhere))
        engine.option.setWrapMode(QTextOption::WrapAnywhere);

    if (tf & Qt::TextJustificationForced)
        engine.forceJustification = true;
    QTextLayout textLayout(&engine);
    textLayout.setCacheEnabled(true);
    textLayout.engine()->underlinePositions = underlinePositions.data();

    if (finalText.isEmpty()) {
        height = fm.height();
        width = 0;
        tf |= Qt::TextDontPrint;
    } else {
        qreal lineWidth = 0x01000000;
        if (wordwrap || (tf & Qt::TextJustificationForced))
            lineWidth = qMax<qreal>(0, r.width());
        if(!wordwrap)
            tf |= Qt::TextIncludeTrailingSpaces;
        textLayout.engine()->ignoreBidi = bool(tf & Qt::TextDontPrint);
        textLayout.beginLayout();

        qreal leading = fm.leading();
        height = -leading;

        while (1) {
            QTextLine l = textLayout.createLine();
            if (!l.isValid())
                break;

            l.setLineWidth(lineWidth);
            height += leading;
            l.setPosition(QPointF(0., height));
            height += l.height();
            width = qMax(width, l.naturalTextWidth());
            if (!dontclip && !brect && height >= r.height())
                break;
        }
        textLayout.endLayout();
    }

    qreal yoff = 0;
    qreal xoff = 0;
    if (tf & Qt::AlignBottom) {
        yoff = r.height() - height;
    } else if (tf & Qt::AlignVCenter) {
        yoff = (r.height() - height)/2;
        if (painter) {
            QTransform::TransformationType type = painter->transform().type();
            if (type <= QTransform::TxScale) {
                // do the rounding manually to work around inconsistencies
                // in the paint engines when drawing on floating point offsets
                const qreal scale = painter->transform().m22();
                if (scale != 0)
                    yoff = -qRound(-yoff * scale) / scale;
            }
        }
    }
    if (tf & Qt::AlignRight) {
        xoff = r.width() - width;
    } else if (tf & Qt::AlignHCenter) {
        xoff = (r.width() - width)/2;
        if (painter) {
            QTransform::TransformationType type = painter->transform().type();
            if (type <= QTransform::TxScale) {
                // do the rounding manually to work around inconsistencies
                // in the paint engines when drawing on floating point offsets
                const qreal scale = painter->transform().m11();
                if (scale != 0)
                    xoff = qRound(xoff * scale) / scale;
            }
        }
    }
    QRectF bounds = QRectF(r.x() + xoff, r.y() + yoff, width, height);

    if (hasMoreLengthVariants && !(tf & Qt::TextLongestVariant) && !r.contains(bounds)) {
        offset++;
        goto start_lengthVariant;
    }
    if (brect)
        *brect = bounds;

    if (!(tf & Qt::TextDontPrint)) {
        bool restore = false;
        if (!dontclip && !r.contains(bounds)) {
            restore = true;
            painter->save();
            painter->setClipRect(r, Qt::IntersectClip);
        }

        for (int i = 0; i < textLayout.lineCount(); i++) {
            QTextLine line = textLayout.lineAt(i);

            qreal advance = line.horizontalAdvance();
            xoff = 0;
            if (tf & Qt::AlignRight) {
                QTextEngine *eng = textLayout.engine();
                xoff = r.width() - advance -
                    eng->leadingSpaceWidth(eng->lines[line.lineNumber()]).toReal();
            }
            else if (tf & Qt::AlignHCenter)
                xoff = (r.width() - advance) / 2;

            line.draw(painter, QPointF(r.x() + xoff, r.y() + yoff));
        }

        if (restore) {
            painter->restore();
        }
    }
}

qt_format_text() [2/2]

void qt_format_text	(	const QFont &	fnt,
		const QRectF &	_r,
		int	tf,
		const QString &	str,
		QRectF *	brect,
		int	tabstops,
		int *	ta,
		int	tabarraylen,
		QPainter *	painter
	)

Definition at line 8448 of file qpainter.cpp.

Referenced by QFontMetrics::boundingRect(), and QFontMetricsF::boundingRect().

{
    qt_format_text(fnt, _r,
                    tf, 0, str, brect,
                    tabstops, ta, tabarraylen,
                    painter);
}

qt_isExtendedRadialGradient()

Q_GUI_EXPORT bool qt_isExtendedRadialGradient

(

const QBrush &

brush

)

Definition at line 881 of file qbrush.cpp.

Referenced by QPainterPrivate::updateEmulationSpecifier(), and QPainterPrivate::updateInvMatrix().

{
    if (brush.style() == Qt::RadialGradientPattern) {
        const QGradient *g = brush.gradient();
        const QRadialGradient *rg = static_cast<const QRadialGradient *>(g);

        if (!qFuzzyIsNull(rg->focalRadius()))
            return true;

        QPointF delta = rg->focalPoint() - rg->center();
        if (delta.x() * delta.x() + delta.y() * delta.y() > rg->radius() * rg->radius())
            return true;
    }

    return false;
}

qt_painter_removePaintDevice()

void qt_painter_removePaintDevice

(

QPaintDevice *

dev

)

Definition at line 8419 of file qpainter.cpp.

Referenced by QPaintDevice::~QPaintDevice().

{
    if (!globalRedirectionAtomic() || *globalRedirectionAtomic() == 0)
        return;

    QMutex *mutex = 0;
    QT_TRY {
        mutex = globalRedirectionsMutex();
    } QT_CATCH(...) {
        // ignore the missing mutex, since we could be called from
        // a destructor, and destructors shall not throw
    }
    QMutexLocker locker(mutex);
    QPaintDeviceRedirectionList *redirections = 0;
    QT_TRY {
        redirections = globalRedirections();
    } QT_CATCH(...) {
        // do nothing - code below is safe with redirections being 0.
    }
    if (redirections) {
        for (int i = 0; i < redirections->size(); ) {
            if(redirections->at(i) == dev || redirections->at(i).replacement == dev)
                redirections->removeAt(i);
            else
                ++i;
        }
    }
}

qt_painter_thread_test()

static bool qt_painter_thread_test ( int  devType, const char *  what, bool  extraCondition = false  )

static

Definition at line 156 of file qpainter.cpp.

Referenced by QPainter::drawPixmap(), QPainter::drawTextItem(), and QPainter::drawTiledPixmap().

{
    switch (devType) {
    case QInternal::Image:
    case QInternal::Printer:
    case QInternal::Picture:
        // can be drawn onto these devices safely from any thread
#ifndef Q_WS_WIN
        if (extraCondition)
#endif
            break;
    default:
#ifdef Q_WS_X11
        if (QApplication::testAttribute(Qt::AA_X11InitThreads))
            return true;
#endif
        if (!extraCondition && QThread::currentThread() != qApp->thread()) {
            qWarning("QPainter: It is not safe to use %s outside the GUI thread", what);
            return false;
        }
        break;
    }
    return true;
}

qt_pixmapForBrush()

QPixmap qt_pixmapForBrush	(	int	style,
		bool	invert
	)

Definition at line 99 of file qbrush.cpp.

{

    QPixmap pm;
    QString key = QLatin1Literal("$qt-brush$")
                  % HexString<uint>(brushStyle)
                  % QLatin1Char(invert ? '1' : '0');
    if (!QPixmapCache::find(key, pm)) {
        pm = QBitmap::fromData(QSize(8, 8), qt_patternForBrush(brushStyle, invert),
                               QImage::Format_MonoLSB);
        QPixmapCache::insert(key, pm);
    }

    return pm;
}

qt_regionToPath()

Q_AUTOTEST_EXPORT QPainterPath qt_regionToPath

(

const QRegion &

region

)

Definition at line 1160 of file qregion.cpp.

Referenced by QPainter::clipPath(), and QPainter::clipRegion().

{
    QPainterPath result;
    if (region.rectCount() == 1) {
        result.addRect(region.boundingRect());
        return result;
    }

    const QVector<QRect> rects = region.rects();

    QVarLengthArray<Segment> segments;
    segments.resize(4 * rects.size());

    const QRect *rect = rects.constData();
    const QRect *end = rect + rects.size();

    int lastRowSegmentCount = 0;
    Segment *lastRowSegments = 0;

    int lastSegment = 0;
    int lastY = 0;
    while (rect != end) {
        const int y = rect[0].y();
        int count = 0;
        while (&rect[count] != end && rect[count].y() == y)
            ++count;

        for (int i = 0; i < count; ++i) {
            int offset = lastSegment + i;
            segments[offset] = Segment(rect[i].topLeft());
            segments[offset += count] = Segment(rect[i].topRight() + QPoint(1, 0));
            segments[offset += count] = Segment(rect[i].bottomRight() + QPoint(1, 1));
            segments[offset += count] = Segment(rect[i].bottomLeft() + QPoint(0, 1));

            offset = lastSegment + i;
            for (int j = 0; j < 4; ++j)
                segments[offset + j * count].connect(segments[offset + ((j + 1) % 4) * count]);
        }

        if (lastRowSegments && lastY == y)
            mergeSegments(lastRowSegments, lastRowSegmentCount, &segments[lastSegment], count);

        lastRowSegments = &segments[lastSegment + 2 * count];
        lastRowSegmentCount = count;
        lastSegment += 4 * count;
        lastY = y + rect[0].height();
        rect += count;
    }

    for (int i = 0; i < lastSegment; ++i) {
        Segment *segment = &segments[i];
        if (!segment->added)
            addSegmentsToPath(segment, result);
    }

    return result;
}

roundInDeviceCoordinates()

static QPointF roundInDeviceCoordinates ( const QPointF &  p, const QTransform &  m  )

inlinestatic

Definition at line 5518 of file qpainter.cpp.

Referenced by QPainter::drawImage(), QPainter::drawPixmap(), and QPainter::drawTiledPixmap().

{
    return m.inverted().map(QPointF(m.map(p).toPoint()));
}

stretchGradientToUserSpace()

static QBrush stretchGradientToUserSpace ( const QBrush &  brush, const QRectF &  boundingRect  )

inlinestatic

Definition at line 531 of file qpainter.cpp.

Referenced by QPainterPrivate::drawStretchedGradient().

{
    Q_ASSERT(brush.style() >= Qt::LinearGradientPattern
             && brush.style() <= Qt::ConicalGradientPattern);

    QTransform gradientToUser(boundingRect.width(), 0, 0, boundingRect.height(),
                              boundingRect.x(), boundingRect.y());

    QGradient g = *brush.gradient();
    g.setCoordinateMode(QGradient::LogicalMode);

    QBrush b(g);
    b.setTransform(gradientToUser * b.transform());
    return b;
}