--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gui/painting/qpaintengine.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,1030 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include "qpaintengine.h"
+#include "qpaintengine_p.h"
+#include "qpainter_p.h"
+#include "qpolygon.h"
+#include "qbitmap.h"
+#include "qapplication.h"
+#include <qdebug.h>
+#include <qmath.h>
+#include <private/qtextengine_p.h>
+#include <qvarlengtharray.h>
+#include <private/qfontengine_p.h>
+#include <private/qpaintengineex_p.h>
+
+
+QT_BEGIN_NAMESPACE
+
+/*!
+ \class QTextItem
+
+ \brief The QTextItem class provides all the information required to draw
+ text in a custom paint engine.
+
+ When you reimplement your own paint engine, you must reimplement
+ QPaintEngine::drawTextItem(), a function that takes a QTextItem as
+ one of its arguments.
+*/
+
+/*!
+ \enum QTextItem::RenderFlag
+
+ \value RightToLeft Render the text from right to left.
+ \value Overline Paint a line above the text.
+ \value Underline Paint a line under the text.
+ \value StrikeOut Paint a line through the text.
+ \omitvalue Dummy
+*/
+
+
+/*!
+ \fn qreal QTextItem::descent() const
+
+ Corresponds to the \l{QFontMetrics::descent()}{descent} of the piece of text that is drawn.
+*/
+qreal QTextItem::descent() const
+{
+ const QTextItemInt *ti = static_cast<const QTextItemInt *>(this);
+ return ti->descent.toReal();
+}
+
+/*!
+ \fn qreal QTextItem::ascent() const
+
+ Corresponds to the \l{QFontMetrics::ascent()}{ascent} of the piece of text that is drawn.
+*/
+qreal QTextItem::ascent() const
+{
+ const QTextItemInt *ti = static_cast<const QTextItemInt *>(this);
+ return ti->ascent.toReal();
+}
+
+/*!
+ \fn qreal QTextItem::width() const
+
+ Specifies the total width of the text to be drawn.
+*/
+qreal QTextItem::width() const
+{
+ const QTextItemInt *ti = static_cast<const QTextItemInt *>(this);
+ return ti->width.toReal();
+}
+
+/*!
+ \fn QTextItem::RenderFlags QTextItem::renderFlags() const
+
+ Returns the render flags used.
+*/
+QTextItem::RenderFlags QTextItem::renderFlags() const
+{
+ const QTextItemInt *ti = static_cast<const QTextItemInt *>(this);
+ return ti->flags;
+}
+
+/*!
+ \fn QString QTextItem::text() const
+
+ Returns the text that should be drawn.
+*/
+QString QTextItem::text() const
+{
+ const QTextItemInt *ti = static_cast<const QTextItemInt *>(this);
+ return QString(ti->chars, ti->num_chars);
+}
+
+/*!
+ \fn QFont QTextItem::font() const
+
+ Returns the font that should be used to draw the text.
+*/
+QFont QTextItem::font() const
+{
+ const QTextItemInt *ti = static_cast<const QTextItemInt *>(this);
+ return ti->f ? *ti->f : QApplication::font();
+}
+
+
+/*!
+ \class QPaintEngine
+ \ingroup painting
+
+ \brief The QPaintEngine class provides an abstract definition of how
+ QPainter draws to a given device on a given platform.
+
+ Qt 4.0 provides several premade implementations of QPaintEngine for the
+ different painter backends we support. We provide one paint engine for each
+ window system and painting framework we support. This includes X11 on
+ Unix/Linux and CoreGraphics on Mac OS X. In addition we provide QPaintEngine
+ implementations for OpenGL (accessible through QGLWidget) and PostScript
+ (accessible through QPSPrinter on X11). Additionally there is a raster-based
+ paint engine that is a fallback for when an engine does not support a certain
+ capability.
+
+ If one wants to use QPainter to draw to a different backend,
+ one must subclass QPaintEngine and reimplement all its virtual
+ functions. The QPaintEngine implementation is then made available by
+ subclassing QPaintDevice and reimplementing the virtual function
+ QPaintDevice::paintEngine().
+
+ QPaintEngine is created and owned by the QPaintDevice that created it.
+
+ The big advantage of the QPaintEngine approach opposed to
+ Qt 3's QPainter/QPaintDevice::cmd() approach is that it is now
+ possible to adapt to multiple technologies on each platform and take
+ advantage of each to the fullest.
+
+ \sa QPainter, QPaintDevice::paintEngine(), {The Paint System}
+*/
+
+/*!
+ \enum QPaintEngine::PaintEngineFeature
+
+ This enum is used to describe the features or capabilities that the
+ paint engine has. If a feature is not supported by the engine,
+ QPainter will do a best effort to emulate that feature through other
+ means and pass on an alpha blended QImage to the engine with the
+ emulated results. Some features cannot be emulated: AlphaBlend and PorterDuff.
+
+ \value AlphaBlend The engine can alpha blend primitives.
+ \value Antialiasing The engine can use antialising to improve the appearance
+ of rendered primitives.
+ \value BlendModes The engine supports blending modes.
+ \value BrushStroke The engine supports drawing strokes that
+ contain brushes as fills, not just solid
+ colors (e.g. a dashed gradient line of
+ width 2).
+ \value ConicalGradientFill The engine supports conical gradient fills.
+ \value ConstantOpacity The engine supports the feature provided by
+ QPainter::setOpacity().
+ \value LinearGradientFill The engine supports linear gradient fills.
+ \value MaskedBrush The engine is capable of rendering brushes that has a
+ texture with an alpha channel or a mask.
+ \value ObjectBoundingModeGradients The engine has native support for gradients
+ with coordinate mode QGradient::ObjectBoundingMode.
+ Otherwise, if QPaintEngine::PatternTransform is
+ supported, object bounding mode gradients are
+ converted to gradients with coordinate mode
+ QGradient::LogicalMode and a brush transform for
+ the coordinate mapping.
+ \value PainterPaths The engine has path support.
+ \value PaintOutsidePaintEvent The engine is capable of painting outside of
+ paint events.
+ \value PatternBrush The engine is capable of rendering brushes with
+ the brush patterns specified in Qt::BrushStyle.
+ \value PatternTransform The engine has support for transforming brush
+ patterns.
+ \value PerspectiveTransform The engine has support for performing perspective
+ transformations on primitives.
+ \value PixmapTransform The engine can transform pixmaps, including
+ rotation and shearing.
+ \value PorterDuff The engine supports Porter-Duff operations
+ \value PrimitiveTransform The engine has support for transforming
+ drawing primitives.
+ \value RadialGradientFill The engine supports radial gradient fills.
+ \value RasterOpModes The engine supports bitwise raster operations.
+ \value AllFeatures All of the above features. This enum value is usually
+ used as a bit mask.
+*/
+
+/*!
+ \enum QPaintEngine::PolygonDrawMode
+
+ \value OddEvenMode The polygon should be drawn using OddEven fill
+ rule.
+
+ \value WindingMode The polygon should be drawn using Winding fill rule.
+
+ \value ConvexMode The polygon is a convex polygon and can be drawn
+ using specialized algorithms where available.
+
+ \value PolylineMode Only the outline of the polygon should be
+ drawn.
+
+*/
+
+/*!
+ \enum QPaintEngine::DirtyFlag
+
+ \value DirtyPen The pen is dirty and needs to be updated.
+
+ \value DirtyBrush The brush is dirty and needs to be updated.
+
+ \value DirtyBrushOrigin The brush origin is dirty and needs to
+ updated.
+
+ \value DirtyFont The font is dirty and needs to be updated.
+
+ \value DirtyBackground The background is dirty and needs to be
+ updated.
+
+ \value DirtyBackgroundMode The background mode is dirty and needs
+ to be updated.
+
+ \value DirtyTransform The transform is dirty and needs to be
+ updated.
+
+ \value DirtyClipRegion The clip region is dirty and needs to be
+ updated.
+
+ \value DirtyClipPath The clip path is dirty and needs to be
+ updated.
+
+ \value DirtyHints The render hints is dirty and needs to be
+ updated.
+
+ \value DirtyCompositionMode The composition mode is dirty and
+ needs to be updated.
+
+ \value DirtyClipEnabled Whether clipping is enabled or not is
+ dirty and needs to be updated.
+
+ \value DirtyOpacity The constant opacity has changed and needs to
+ be updated as part of the state change in
+ QPaintEngine::updateState().
+
+ \value AllDirty Convenience enum used internally.
+
+ These types are used by QPainter to trigger lazy updates of the
+ various states in the QPaintEngine using
+ QPaintEngine::updateState().
+
+ A paint engine must update every dirty state.
+*/
+
+/*!
+ \fn void QPaintEngine::syncState()
+
+ \internal
+
+ Updates all dirty states in this engine. This function should ONLY
+ be used when drawing with native handles directly and immediate sync
+ from QPainters state to the native state is required.
+*/
+void QPaintEngine::syncState()
+{
+ Q_ASSERT(state);
+ updateState(*state);
+
+ if (isExtended())
+ static_cast<QPaintEngineEx *>(this)->sync();
+}
+
+static QPaintEngine *qt_polygon_recursion = 0;
+struct QT_Point {
+ int x;
+ int y;
+};
+
+/*!
+ \fn void QPaintEngine::drawPolygon(const QPointF *points, int pointCount,
+ PolygonDrawMode mode)
+
+ Reimplement this virtual function to draw the polygon defined
+ by the \a pointCount first points in \a points, using mode \a
+ mode.
+
+ \note At least one of the drawPolygon() functions must be reimplemented.
+*/
+void QPaintEngine::drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode)
+{
+ Q_ASSERT_X(qt_polygon_recursion != this, "QPaintEngine::drawPolygon",
+ "At least one drawPolygon function must be implemented");
+ qt_polygon_recursion = this;
+ Q_ASSERT(sizeof(QT_Point) == sizeof(QPoint));
+ QVarLengthArray<QT_Point> p(pointCount);
+ for (int i = 0; i < pointCount; ++i) {
+ p[i].x = qRound(points[i].x());
+ p[i].y = qRound(points[i].y());
+ }
+ drawPolygon((QPoint *)p.data(), pointCount, mode);
+ qt_polygon_recursion = 0;
+}
+
+struct QT_PointF {
+ qreal x;
+ qreal y;
+};
+/*!
+ \overload
+
+ Reimplement this virtual function to draw the polygon defined by the
+ \a pointCount first points in \a points, using mode \a mode.
+
+ \note At least one of the drawPolygon() functions must be reimplemented.
+*/
+void QPaintEngine::drawPolygon(const QPoint *points, int pointCount, PolygonDrawMode mode)
+{
+ Q_ASSERT_X(qt_polygon_recursion != this, "QPaintEngine::drawPolygon",
+ "At least one drawPolygon function must be implemented");
+ qt_polygon_recursion = this;
+ Q_ASSERT(sizeof(QT_PointF) == sizeof(QPointF));
+ QVarLengthArray<QT_PointF> p(pointCount);
+ for (int i=0; i<pointCount; ++i) {
+ p[i].x = points[i].x();
+ p[i].y = points[i].y();
+ }
+ drawPolygon((QPointF *)p.data(), pointCount, mode);
+ qt_polygon_recursion = 0;
+}
+
+/*!
+ \enum QPaintEngine::Type
+
+ \value X11
+ \value Windows
+ \value MacPrinter
+ \value CoreGraphics Mac OS X's Quartz2D (CoreGraphics)
+ \value QuickDraw Mac OS X's QuickDraw
+ \value QWindowSystem Qt for Embedded Linux
+ \value PostScript
+ \value OpenGL
+ \value Picture QPicture format
+ \value SVG Scalable Vector Graphics XML format
+ \value Raster
+ \value Direct3D Windows only, Direct3D based engine
+ \value Pdf Portable Document Format
+ \value OpenVG
+ \value User First user type ID
+ \value MaxUser Last user type ID
+ \value OpenGL2
+ \value PaintBuffer
+*/
+
+/*!
+ \fn bool QPaintEngine::isActive() const
+
+ Returns true if the paint engine is actively drawing; otherwise
+ returns false.
+
+ \sa setActive()
+*/
+
+/*!
+ \fn void QPaintEngine::setActive(bool state)
+
+ Sets the active state of the paint engine to \a state.
+
+ \sa isActive()
+*/
+
+/*!
+ \fn bool QPaintEngine::begin(QPaintDevice *pdev)
+
+ Reimplement this function to initialise your paint engine when
+ painting is to start on the paint device \a pdev. Return true if
+ the initialization was successful; otherwise return false.
+
+ \sa end() isActive()
+*/
+
+/*!
+ \fn bool QPaintEngine::end()
+
+ Reimplement this function to finish painting on the current paint
+ device. Return true if painting was finished successfully;
+ otherwise return false.
+
+ \sa begin() isActive()
+*/
+
+
+/*!
+ Draws the first \a pointCount points in the buffer \a points
+*/
+void QPaintEngine::drawPoints(const QPointF *points, int pointCount)
+{
+ QPainter *p = painter();
+ if (!p)
+ return;
+
+ qreal penWidth = p->pen().widthF();
+ if (penWidth == 0)
+ penWidth = 1;
+
+ bool ellipses = p->pen().capStyle() == Qt::RoundCap;
+
+ p->save();
+
+ QTransform transform;
+ if (p->pen().isCosmetic()) {
+ transform = p->transform();
+ p->setTransform(QTransform());
+ }
+
+ p->setBrush(p->pen().brush());
+ p->setPen(Qt::NoPen);
+
+ for (int i=0; i<pointCount; ++i) {
+ QPointF pos = transform.map(points[i]);
+ QRectF rect(pos.x() - penWidth / 2, pos.y() - penWidth / 2, penWidth, penWidth);
+
+ if (ellipses)
+ p->drawEllipse(rect);
+ else
+ p->drawRect(rect);
+ }
+
+ p->restore();
+}
+
+
+/*!
+ Draws the first \a pointCount points in the buffer \a points
+
+ The default implementation converts the first \a pointCount QPoints in \a points
+ to QPointFs and calls the floating point version of drawPoints.
+
+*/
+void QPaintEngine::drawPoints(const QPoint *points, int pointCount)
+{
+ Q_ASSERT(sizeof(QT_PointF) == sizeof(QPointF));
+ QT_PointF fp[256];
+ while (pointCount) {
+ int i = 0;
+ while (i < pointCount && i < 256) {
+ fp[i].x = points[i].x();
+ fp[i].y = points[i].y();
+ ++i;
+ }
+ drawPoints((QPointF *)(void *)fp, i);
+ points += i;
+ pointCount -= i;
+ }
+}
+
+/*!
+ \fn void QPaintEngine::drawEllipse(const QRectF &rect)
+
+ Reimplement this function to draw the largest ellipse that can be
+ contained within rectangle \a rect.
+
+ The default implementation calls drawPolygon().
+*/
+void QPaintEngine::drawEllipse(const QRectF &rect)
+{
+ QPainterPath path;
+ path.addEllipse(rect);
+ if (hasFeature(PainterPaths)) {
+ drawPath(path);
+ } else {
+ QPolygonF polygon = path.toFillPolygon();
+ drawPolygon(polygon.data(), polygon.size(), ConvexMode);
+ }
+}
+
+/*!
+ The default implementation of this function calls the floating
+ point version of this function
+*/
+void QPaintEngine::drawEllipse(const QRect &rect)
+{
+ drawEllipse(QRectF(rect));
+}
+
+/*!
+ \fn void QPaintEngine::drawPixmap(const QRectF &r, const QPixmap
+ &pm, const QRectF &sr)
+
+ Reimplement this function to draw the part of the \a pm
+ specified by the \a sr rectangle in the given \a r.
+*/
+
+
+void qt_fill_tile(QPixmap *tile, const QPixmap &pixmap)
+{
+ QPainter p(tile);
+ p.drawPixmap(0, 0, pixmap);
+ int x = pixmap.width();
+ while (x < tile->width()) {
+ p.drawPixmap(x, 0, *tile, 0, 0, x, pixmap.height());
+ x *= 2;
+ }
+ int y = pixmap.height();
+ while (y < tile->height()) {
+ p.drawPixmap(0, y, *tile, 0, 0, tile->width(), y);
+ y *= 2;
+ }
+}
+
+void qt_draw_tile(QPaintEngine *gc, qreal x, qreal y, qreal w, qreal h,
+ const QPixmap &pixmap, qreal xOffset, qreal yOffset)
+{
+ qreal yPos, xPos, drawH, drawW, yOff, xOff;
+ yPos = y;
+ yOff = yOffset;
+ while(yPos < y + h) {
+ drawH = pixmap.height() - yOff; // Cropping first row
+ if (yPos + drawH > y + h) // Cropping last row
+ drawH = y + h - yPos;
+ xPos = x;
+ xOff = xOffset;
+ while(xPos < x + w) {
+ drawW = pixmap.width() - xOff; // Cropping first column
+ if (xPos + drawW > x + w) // Cropping last column
+ drawW = x + w - xPos;
+ if (drawW > 0 && drawH > 0)
+ gc->drawPixmap(QRectF(xPos, yPos, drawW, drawH), pixmap, QRectF(xOff, yOff, drawW, drawH));
+ xPos += drawW;
+ xOff = 0;
+ }
+ yPos += drawH;
+ yOff = 0;
+ }
+}
+
+
+/*!
+ Reimplement this function to draw the \a pixmap in the given \a
+ rect, starting at the given \a p. The pixmap will be
+ drawn repeatedly until the \a rect is filled.
+*/
+void QPaintEngine::drawTiledPixmap(const QRectF &rect, const QPixmap &pixmap, const QPointF &p)
+{
+ int sw = pixmap.width();
+ int sh = pixmap.height();
+
+ if (sw*sh < 8192 && sw*sh < 16*rect.width()*rect.height()) {
+ int tw = sw, th = sh;
+ while (tw*th < 32678 && tw < rect.width()/2)
+ tw *= 2;
+ while (tw*th < 32678 && th < rect.height()/2)
+ th *= 2;
+ QPixmap tile;
+ if (pixmap.depth() == 1) {
+ tile = QBitmap(tw, th);
+ } else {
+ tile = QPixmap(tw, th);
+ if (pixmap.hasAlphaChannel())
+ tile.fill(Qt::transparent);
+ }
+ qt_fill_tile(&tile, pixmap);
+ qt_draw_tile(this, rect.x(), rect.y(), rect.width(), rect.height(), tile, p.x(), p.y());
+ } else {
+ qt_draw_tile(this, rect.x(), rect.y(), rect.width(), rect.height(), pixmap, p.x(), p.y());
+ }
+}
+
+/*!
+ \fn void QPaintEngine::drawImage(const QRectF &rectangle, const QImage
+ &image, const QRectF &sr, Qt::ImageConversionFlags flags)
+
+ Reimplement this function to draw the part of the \a image
+ specified by the \a sr rectangle in the given \a rectangle using
+ the given conversion flags \a flags, to convert it to a pixmap.
+*/
+
+void QPaintEngine::drawImage(const QRectF &r, const QImage &image, const QRectF &sr,
+ Qt::ImageConversionFlags flags)
+{
+ QRectF baseSize(0, 0, image.width(), image.height());
+ QImage im = image;
+ if (baseSize != sr)
+ im = im.copy(qFloor(sr.x()), qFloor(sr.y()),
+ qCeil(sr.width()), qCeil(sr.height()));
+ QPixmap pm = QPixmap::fromImage(im, flags);
+ drawPixmap(r, pm, QRectF(QPointF(0, 0), pm.size()));
+}
+
+/*!
+ \fn Type QPaintEngine::type() const
+
+ Reimplement this function to return the paint engine \l{Type}.
+*/
+
+/*!
+ \fn void QPaintEngine::fix_neg_rect(int *x, int *y, int *w, int *h);
+
+ \internal
+*/
+
+/*!
+ \fn bool QPaintEngine::testDirty(DirtyFlags df)
+
+ \internal
+*/
+
+/*!
+ \fn void QPaintEngine::clearDirty(DirtyFlags df)
+
+ \internal
+*/
+
+/*!
+ \fn void QPaintEngine::setDirty(DirtyFlags df)
+
+ \internal
+*/
+
+/*!
+ \fn bool QPaintEngine::hasFeature(PaintEngineFeatures feature) const
+
+ Returns true if the paint engine supports the specified \a
+ feature; otherwise returns false.
+*/
+
+/*!
+ \fn bool QPaintEngine::isExtended() const
+
+ \internal
+
+ Returns true if the paint engine is a QPaintEngineEx derivative.
+*/
+
+/*!
+ \fn void QPaintEngine::updateState(const QPaintEngineState &state)
+
+ Reimplement this function to update the state of a paint engine.
+
+ When implemented, this function is responsible for checking the
+ paint engine's current \a state and update the properties that are
+ changed. Use the QPaintEngineState::state() function to find out
+ which properties that must be updated, then use the corresponding
+ \l {GetFunction}{get function} to retrieve the current values for
+ the given properties.
+
+ \sa QPaintEngineState
+*/
+
+/*!
+ Creates a paint engine with the featureset specified by \a caps.
+*/
+
+QPaintEngine::QPaintEngine(PaintEngineFeatures caps)
+ : state(0),
+ gccaps(caps),
+ active(0),
+ selfDestruct(false),
+ extended(false),
+ d_ptr(new QPaintEnginePrivate)
+{
+ d_ptr->q_ptr = this;
+}
+
+/*!
+ \internal
+*/
+
+QPaintEngine::QPaintEngine(QPaintEnginePrivate &dptr, PaintEngineFeatures caps)
+ : state(0),
+ gccaps(caps),
+ active(0),
+ selfDestruct(false),
+ extended(false),
+ d_ptr(&dptr)
+{
+ d_ptr->q_ptr = this;
+}
+
+/*!
+ Destroys the paint engine.
+*/
+QPaintEngine::~QPaintEngine()
+{
+}
+
+/*!
+ Returns the paint engine's painter.
+*/
+QPainter *QPaintEngine::painter() const
+{
+ return state ? state->painter() : 0;
+}
+
+/*!
+ The default implementation ignores the \a path and does nothing.
+*/
+
+void QPaintEngine::drawPath(const QPainterPath &)
+{
+ if (hasFeature(PainterPaths)) {
+ qWarning("QPaintEngine::drawPath: Must be implemented when feature PainterPaths is set");
+ }
+}
+
+/*!
+ This function draws the text item \a textItem at position \a p. The
+ default implementation of this function converts the text to a
+ QPainterPath and paints the resulting path.
+*/
+
+void QPaintEngine::drawTextItem(const QPointF &p, const QTextItem &textItem)
+{
+ const QTextItemInt &ti = static_cast<const QTextItemInt &>(textItem);
+
+ QPainterPath path;
+#ifndef Q_WS_MAC
+ path.setFillRule(Qt::WindingFill);
+#endif
+ if (ti.glyphs.numGlyphs)
+ ti.fontEngine->addOutlineToPath(p.x(), p.y(), ti.glyphs, &path, ti.flags);
+ if (!path.isEmpty()) {
+ bool oldAA = painter()->renderHints() & QPainter::Antialiasing;
+ painter()->setRenderHint(QPainter::Antialiasing,
+ bool((painter()->renderHints() & QPainter::TextAntialiasing)
+ && !(painter()->font().styleStrategy() & QFont::NoAntialias)));
+ painter()->fillPath(path, state->pen().brush());
+ painter()->setRenderHint(QPainter::Antialiasing, oldAA);
+ }
+}
+
+/*!
+ The default implementation splits the list of lines in \a lines
+ into \a lineCount separate calls to drawPath() or drawPolygon()
+ depending on the feature set of the paint engine.
+*/
+void QPaintEngine::drawLines(const QLineF *lines, int lineCount)
+{
+ for (int i=0; i<lineCount; ++i) {
+ QPointF pts[2] = { lines[i].p1(), lines[i].p2() };
+
+ if (pts[0] == pts[1]) {
+ if (state->pen().capStyle() != Qt::FlatCap)
+ drawPoints(pts, 1);
+ continue;
+ }
+
+ drawPolygon(pts, 2, PolylineMode);
+ }
+}
+
+/*!
+ \overload
+
+ The default implementation converts the first \a lineCount lines
+ in \a lines to a QLineF and calls the floating point version of
+ this function.
+*/
+void QPaintEngine::drawLines(const QLine *lines, int lineCount)
+{
+ struct PointF {
+ qreal x;
+ qreal y;
+ };
+ struct LineF {
+ PointF p1;
+ PointF p2;
+ };
+ Q_ASSERT(sizeof(PointF) == sizeof(QPointF));
+ Q_ASSERT(sizeof(LineF) == sizeof(QLineF));
+ LineF fl[256];
+ while (lineCount) {
+ int i = 0;
+ while (i < lineCount && i < 256) {
+ fl[i].p1.x = lines[i].x1();
+ fl[i].p1.y = lines[i].y1();
+ fl[i].p2.x = lines[i].x2();
+ fl[i].p2.y = lines[i].y2();
+ ++i;
+ }
+ drawLines((QLineF *)(void *)fl, i);
+ lines += i;
+ lineCount -= i;
+ }
+}
+
+
+/*!
+ \overload
+
+ The default implementation converts the first \a rectCount
+ rectangles in the buffer \a rects to a QRectF and calls the
+ floating point version of this function.
+*/
+void QPaintEngine::drawRects(const QRect *rects, int rectCount)
+{
+ struct RectF {
+ qreal x;
+ qreal y;
+ qreal w;
+ qreal h;
+ };
+ Q_ASSERT(sizeof(RectF) == sizeof(QRectF));
+ RectF fr[256];
+ while (rectCount) {
+ int i = 0;
+ while (i < rectCount && i < 256) {
+ fr[i].x = rects[i].x();
+ fr[i].y = rects[i].y();
+ fr[i].w = rects[i].width();
+ fr[i].h = rects[i].height();
+ ++i;
+ }
+ drawRects((QRectF *)(void *)fr, i);
+ rects += i;
+ rectCount -= i;
+ }
+}
+
+/*!
+ Draws the first \a rectCount rectangles in the buffer \a
+ rects. The default implementation of this function calls drawPath()
+ or drawPolygon() depending on the feature set of the paint engine.
+*/
+void QPaintEngine::drawRects(const QRectF *rects, int rectCount)
+{
+ if (hasFeature(PainterPaths) &&
+ !state->penNeedsResolving() &&
+ !state->brushNeedsResolving()) {
+ for (int i=0; i<rectCount; ++i) {
+ QPainterPath path;
+ path.addRect(rects[i]);
+ if (path.isEmpty())
+ continue;
+ drawPath(path);
+ }
+ } else {
+ for (int i=0; i<rectCount; ++i) {
+ QRectF rf = rects[i];
+ QPointF pts[4] = { QPointF(rf.x(), rf.y()),
+ QPointF(rf.x() + rf.width(), rf.y()),
+ QPointF(rf.x() + rf.width(), rf.y() + rf.height()),
+ QPointF(rf.x(), rf.y() + rf.height()) };
+ drawPolygon(pts, 4, ConvexMode);
+ }
+ }
+}
+
+/*!
+ \internal
+ Sets the paintdevice that this engine operates on to \a device
+*/
+void QPaintEngine::setPaintDevice(QPaintDevice *device)
+{
+ d_func()->pdev = device;
+}
+
+/*!
+ Returns the device that this engine is painting on, if painting is
+ active; otherwise returns 0.
+*/
+QPaintDevice *QPaintEngine::paintDevice() const
+{
+ return d_func()->pdev;
+}
+
+#ifdef Q_WS_WIN
+/*!
+ \internal
+
+ Empty default implementation.
+*/
+
+HDC QPaintEngine::getDC() const
+{
+ return 0;
+}
+
+
+/*!
+ \internal
+
+ Empty default implementation.
+*/
+
+void QPaintEngine::releaseDC(HDC) const
+{
+}
+
+#endif
+
+/*!
+ \internal
+
+ Returns the offset from the painters origo to the engines
+ origo. This value is used by QPainter for engines who have
+ internal double buffering.
+
+ This function only makes sense when the engine is active.
+*/
+QPoint QPaintEngine::coordinateOffset() const
+{
+ return QPoint();
+}
+
+/*!
+ \internal
+
+ Sets the system clip for this engine. The system clip defines the
+ basis area that the engine has to draw in. All clips that are
+ set will be be an intersection with the system clip.
+
+ Reset the systemclip to no clip by setting an empty region.
+*/
+void QPaintEngine::setSystemClip(const QRegion ®ion)
+{
+ Q_D(QPaintEngine);
+ d->systemClip = region;
+ // Be backward compatible and only call d->systemStateChanged()
+ // if we currently have a system transform/viewport set.
+ if (d->hasSystemTransform || d->hasSystemViewport) {
+ d->transformSystemClip();
+ d->systemStateChanged();
+ }
+}
+
+/*!
+ \internal
+
+ Returns the system clip. The system clip is read only while the
+ painter is active. An empty region indicates that system clip
+ is not in use.
+*/
+
+QRegion QPaintEngine::systemClip() const
+{
+ return d_func()->systemClip;
+}
+
+/*!
+ \internal
+
+ Sets the target rect for drawing within the backing store. This
+ function should ONLY be used by the backing store.
+*/
+void QPaintEngine::setSystemRect(const QRect &rect)
+{
+ if (isActive()) {
+ qWarning("QPaintEngine::setSystemRect: Should not be changed while engine is active");
+ return;
+ }
+ d_func()->systemRect = rect;
+}
+
+/*!
+ \internal
+
+ Retreives the rect for drawing within the backing store. This
+ function should ONLY be used by the backing store.
+ */
+QRect QPaintEngine::systemRect() const
+{
+ return d_func()->systemRect;
+}
+
+void QPaintEnginePrivate::drawBoxTextItem(const QPointF &p, const QTextItemInt &ti)
+{
+ if (!ti.glyphs.numGlyphs)
+ return;
+
+ // any fixes here should probably also be done in QFontEngineBox::draw
+ const int size = qRound(ti.fontEngine->ascent());
+ QVarLengthArray<QFixedPoint> positions;
+ QVarLengthArray<glyph_t> glyphs;
+ QTransform matrix = QTransform::fromTranslate(p.x(), p.y() - size);
+ ti.fontEngine->getGlyphPositions(ti.glyphs, matrix, ti.flags, glyphs, positions);
+ if (glyphs.size() == 0)
+ return;
+
+ QSize s(size - 3, size - 3);
+
+ QPainter *painter = q_func()->state->painter();
+ painter->save();
+ painter->setBrush(Qt::NoBrush);
+ QPen pen = painter->pen();
+ pen.setWidthF(ti.fontEngine->lineThickness().toReal());
+ painter->setPen(pen);
+ for (int k = 0; k < positions.size(); k++)
+ painter->drawRect(QRectF(positions[k].toPointF(), s));
+ painter->restore();
+}
+
+QT_END_NAMESPACE