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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 733 insertions, 0 deletions

diff --git a/src/gui/text/qstatictext.cpp b/src/gui/text/qstatictext.cpp
new file mode 100644
index 0000000000..1cfb4b61f9
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+++ b/src/gui/text/qstatictext.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite 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 "qstatictext.h"
+#include "qstatictext_p.h"
+#include <private/qtextengine_p.h>
+#include <private/qfontengine_p.h>
+#include <qabstracttextdocumentlayout.h>
+
+#include <QtGui/qapplication.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QStaticText
+    \brief The QStaticText class enables optimized drawing of text when the text and its layout
+    is updated rarely.
+    \since 4.7
+
+    \ingroup multimedia
+    \ingroup text
+    \mainclass
+
+    QStaticText provides a way to cache layout data for a block of text so that it can be drawn
+    more efficiently than by using QPainter::drawText() in which the layout information is 
+    recalculated with every call. 
+
+    The class primarily provides an optimization for cases where the text, its font and the
+    transformations on the painter are static over several paint events. If the text or its layout
+    is changed for every iteration, QPainter::drawText() is the more efficient alternative, since
+    the static text's layout would have to be recalculated to take the new state into consideration.
+
+    Translating the painter will not cause the layout of the text to be recalculated, but will cause
+    a very small performance impact on drawStaticText(). Altering any other parts of the painter's
+    transformation or the painter's font will cause the layout of the static text to be
+    recalculated. This should be avoided as often as possible to maximize the performance
+    benefit of using QStaticText.
+
+    In addition, only affine transformations are supported by drawStaticText(). Calling
+    drawStaticText() on a projected painter will perform slightly worse than using the regular
+    drawText() call, so this should be avoided.
+
+    \code
+    class MyWidget: public QWidget
+    {
+    public:
+        MyWidget(QWidget *parent = 0) : QWidget(parent), m_staticText("This is static text")
+
+    protected:
+        void paintEvent(QPaintEvent *)
+        {
+            QPainter painter(this);
+            painter.drawStaticText(0, 0, m_staticText);
+        }
+
+    private:
+        QStaticText m_staticText;
+    };
+    \endcode
+
+    The QStaticText class can be used to mimic the behavior of QPainter::drawText() to a specific
+    point with no boundaries, and also when QPainter::drawText() is called with a bounding 
+    rectangle. 
+
+    If a bounding rectangle is not required, create a QStaticText object without setting a preferred
+    text width. The text will then occupy a single line.
+
+    If you set a text width on the QStaticText object, this will bound the text. The text will
+    be formatted so that no line exceeds the given width. The text width set for QStaticText will
+    not automatically be used for clipping. To achieve clipping in addition to line breaks, use
+    QPainter::setClipRect(). The position of the text is decided by the argument passed to
+    QPainter::drawStaticText() and can change from call to call with a minimal impact on
+    performance.
+
+    For extra convenience, it is possible to apply formatting to the text using the HTML subset
+    supported by QTextDocument. QStaticText will attempt to guess the format of the input text using
+    Qt::mightBeRichText(), and interpret it as rich text if this function returns true. To force
+    QStaticText to display its contents as either plain text or rich text, use the function
+    QStaticText::setTextFormat() and pass in, respectively, Qt::PlainText and Qt::RichText.
+
+    QStaticText can only represent text, so only HTML tags which alter the layout or appearance of
+    the text will be respected. Adding an image to the input HTML, for instance, will cause the
+    image to be included as part of the layout, affecting the positions of the text glyphs, but it
+    will not be displayed. The result will be an empty area the size of the image in the output.
+    Similarly, using tables will cause the text to be laid out in table format, but the borders
+    will not be drawn.
+
+    If it's the first time the static text is drawn, or if the static text, or the painter's font
+    has been altered since the last time it was drawn, the text's layout has to be
+    recalculated. On some paint engines, changing the matrix of the painter will also cause the
+    layout to be recalculated. In particular, this will happen for any engine except for the
+    OpenGL2 paint engine. Recalculating the layout will impose an overhead on the
+    QPainter::drawStaticText() call where it occurs. To avoid this overhead in the paint event, you
+    can call prepare() ahead of time to ensure that the layout is calculated.
+
+    \sa QPainter::drawText(), QPainter::drawStaticText(), QTextLayout, QTextDocument
+*/
+
+/*!
+    \enum QStaticText::PerformanceHint
+
+    This enum the different performance hints that can be set on the QStaticText. These hints
+    can be used to indicate that the QStaticText should use additional caches, if possible,
+    to improve performance at the expense of memory. In particular, setting the performance hint
+    AggressiveCaching on the QStaticText will improve performance when using the OpenGL graphics
+    system or when drawing to a QGLWidget.
+
+    \value ModerateCaching Do basic caching for high performance at a low memory cost.
+    \value AggressiveCaching Use additional caching when available. This may improve performance
+           at a higher memory cost.
+*/
+
+/*!
+    Constructs an empty QStaticText
+*/
+QStaticText::QStaticText()    
+    : data(new QStaticTextPrivate)
+{
+}
+
+/*!
+    Constructs a QStaticText object with the given \a text.
+*/
+QStaticText::QStaticText(const QString &text)
+    : data(new QStaticTextPrivate)
+{    
+    data->text = text;
+    data->invalidate();
+}
+
+/*!
+    Constructs a QStaticText object which is a copy of \a other.
+*/
+QStaticText::QStaticText(const QStaticText &other)    
+{
+    data = other.data;
+}
+
+/*!
+    Destroys the QStaticText.
+*/
+QStaticText::~QStaticText()
+{
+    Q_ASSERT(!data || data->ref >= 1);
+}
+
+/*!
+    \internal
+*/
+void QStaticText::detach()
+{    
+    if (data->ref != 1)
+        data.detach();
+}
+
+/*!
+  Prepares the QStaticText object for being painted with the given \a matrix and the given \a font
+  to avoid overhead when the actual drawStaticText() call is made.
+
+  When drawStaticText() is called, the layout of the QStaticText will be recalculated if any part
+  of the QStaticText object has changed since the last time it was drawn. It will also be
+  recalculated if the painter's font is not the same as when the QStaticText was last drawn, or,
+  on any other paint engine than the OpenGL2 engine, if the painter's matrix has been altered
+  since the static text was last drawn.
+
+  To avoid the overhead of creating the layout the first time you draw the QStaticText after
+  making changes, you can use the prepare() function and pass in the \a matrix and \a font you
+  expect to use when drawing the text.
+
+  \sa QPainter::setFont(), QPainter::setMatrix()
+*/
+void QStaticText::prepare(const QTransform &matrix, const QFont &font)
+{
+    data->matrix = matrix;
+    data->font = font;
+    data->init();
+}
+
+
+/*!
+    Assigns \a other to this QStaticText.
+*/
+QStaticText &QStaticText::operator=(const QStaticText &other)
+{    
+    data = other.data;
+    return *this;
+}
+
+/*!
+    Compares \a other to this QStaticText. Returns true if the texts, fonts and text widths
+    are equal.
+*/
+bool QStaticText::operator==(const QStaticText &other) const
+{
+    return (data == other.data
+            || (data->text == other.data->text
+                && data->font == other.data->font
+                && data->textWidth == other.data->textWidth));
+}
+
+/*!
+    Compares \a other to this QStaticText. Returns true if the texts, fonts or maximum sizes
+    are different.
+*/
+bool QStaticText::operator!=(const QStaticText &other) const
+{
+    return !(*this == other);
+}
+
+/*!
+    Sets the text of the QStaticText to \a text.
+
+    \note This function will cause the layout of the text to require recalculation.
+
+    \sa text()
+*/
+void QStaticText::setText(const QString &text)
+{
+    detach();
+    data->text = text;
+    data->invalidate();
+}
+
+/*!
+   Sets the text format of the QStaticText to \a textFormat. If \a textFormat is set to
+   Qt::AutoText (the default), the format of the text will try to be determined using the
+   function Qt::mightBeRichText(). If the text format is Qt::PlainText, then the text will be
+   displayed as is, whereas it will be interpreted as HTML if the format is Qt::RichText. HTML tags
+   that alter the font of the text, its color, or its layout are supported by QStaticText.
+
+   \note This function will cause the layout of the text to require recalculation.
+
+   \sa textFormat(), setText(), text()
+*/
+void QStaticText::setTextFormat(Qt::TextFormat textFormat)
+{
+    detach();
+    data->textFormat = textFormat;
+    data->invalidate();
+}
+
+/*!
+  Returns the text format of the QStaticText.
+
+  \sa setTextFormat(), setText(), text()
+*/
+Qt::TextFormat QStaticText::textFormat() const
+{
+    return Qt::TextFormat(data->textFormat);
+}
+
+/*!
+    Returns the text of the QStaticText.
+
+    \sa setText()
+*/
+QString QStaticText::text() const 
+{
+    return data->text;
+}
+
+/*!
+  Sets the performance hint of the QStaticText according to the \a
+  performanceHint provided. The \a performanceHint is used to
+  customize how much caching is done internally to improve
+  performance.
+
+  The default is QStaticText::ModerateCaching.
+
+  \note This function will cause the layout of the text to require recalculation.
+
+  \sa performanceHint()
+*/
+void QStaticText::setPerformanceHint(PerformanceHint performanceHint)
+{
+    if ((performanceHint == ModerateCaching && !data->useBackendOptimizations)
+        || (performanceHint == AggressiveCaching && data->useBackendOptimizations)) {
+        return;
+    }
+    detach();
+    data->useBackendOptimizations = (performanceHint == AggressiveCaching);
+    data->invalidate();
+}
+
+/*!
+  Returns which performance hint is set for the QStaticText.
+
+  \sa setPerformanceHint()
+*/
+QStaticText::PerformanceHint QStaticText::performanceHint() const
+{
+    return data->useBackendOptimizations ? AggressiveCaching : ModerateCaching;
+}
+
+/*!
+   Sets the text option structure that controls the layout process to the given \a textOption.
+
+   \sa textOption()
+*/
+void QStaticText::setTextOption(const QTextOption &textOption)
+{
+    detach();
+    data->textOption = textOption;
+    data->invalidate();
+}
+
+/*!
+    Returns the current text option used to control the layout process.
+*/
+QTextOption QStaticText::textOption() const
+{
+    return data->textOption;
+}
+
+/*!
+    Sets the preferred width for this QStaticText. If the text is wider than the specified width,
+    it will be broken into multiple lines and grow vertically. If the text cannot be split into
+    multiple lines, it will be larger than the specified \a textWidth.
+
+    Setting the preferred text width to a negative number will cause the text to be unbounded.
+
+    Use size() to get the actual size of the text.
+
+    \note This function will cause the layout of the text to require recalculation.
+
+    \sa textWidth(), size()
+*/
+void QStaticText::setTextWidth(qreal textWidth)
+{
+    detach();
+    data->textWidth = textWidth;
+    data->invalidate();
+}
+
+/*!
+    Returns the preferred width for this QStaticText.
+
+    \sa setTextWidth()
+*/
+qreal QStaticText::textWidth() const
+{
+    return data->textWidth;
+}
+
+/*!
+  Returns the size of the bounding rect for this QStaticText.
+
+  \sa textWidth()
+*/
+QSizeF QStaticText::size() const
+{
+    if (data->needsRelayout)
+        data->init();
+    return data->actualSize;
+}
+
+QStaticTextPrivate::QStaticTextPrivate()
+        : textWidth(-1.0), items(0), itemCount(0), glyphPool(0), positionPool(0), charPool(0),
+          needsRelayout(true), useBackendOptimizations(false), textFormat(Qt::AutoText),
+          untransformedCoordinates(false)
+{
+}
+
+QStaticTextPrivate::QStaticTextPrivate(const QStaticTextPrivate &other)
+    : text(other.text), font(other.font), textWidth(other.textWidth), matrix(other.matrix),
+      items(0), itemCount(0), glyphPool(0), positionPool(0), charPool(0), textOption(other.textOption),
+      needsRelayout(true), useBackendOptimizations(other.useBackendOptimizations),
+      textFormat(other.textFormat), untransformedCoordinates(other.untransformedCoordinates)
+{
+}
+
+QStaticTextPrivate::~QStaticTextPrivate()
+{
+    delete[] items;
+    delete[] glyphPool;
+    delete[] positionPool;
+    delete[] charPool;
+}
+
+QStaticTextPrivate *QStaticTextPrivate::get(const QStaticText *q)
+{
+    return q->data.data();
+}
+
+namespace {
+
+    class DrawTextItemRecorder: public QPaintEngine
+    {
+    public:
+        DrawTextItemRecorder(bool untransformedCoordinates, bool useBackendOptimizations)
+                : m_dirtyPen(false), m_useBackendOptimizations(useBackendOptimizations),
+                  m_untransformedCoordinates(untransformedCoordinates)
+        {
+        }
+
+        virtual void updateState(const QPaintEngineState &newState)
+        {
+            if (newState.state() & QPaintEngine::DirtyPen)
+                m_dirtyPen = true;
+        }
+
+        virtual void drawTextItem(const QPointF &position, const QTextItem &textItem)
+        {
+            const QTextItemInt &ti = static_cast<const QTextItemInt &>(textItem);
+
+            QStaticTextItem currentItem;
+            currentItem.setFontEngine(ti.fontEngine);
+            currentItem.font = ti.font();
+            currentItem.charOffset = m_chars.size();
+            currentItem.numChars = ti.num_chars;
+            currentItem.glyphOffset = m_glyphs.size(); // Store offset into glyph pool
+            currentItem.positionOffset = m_glyphs.size(); // Offset into position pool
+            currentItem.useBackendOptimizations = m_useBackendOptimizations;
+            if (m_dirtyPen)
+                currentItem.color = state->pen().color();
+
+            QTransform matrix = m_untransformedCoordinates ? QTransform() : state->transform();
+            matrix.translate(position.x(), position.y());
+
+            QVarLengthArray<glyph_t> glyphs;
+            QVarLengthArray<QFixedPoint> positions;
+            ti.fontEngine->getGlyphPositions(ti.glyphs, matrix, ti.flags, glyphs, positions);
+
+            int size = glyphs.size();
+            Q_ASSERT(size == positions.size());
+            currentItem.numGlyphs = size;
+
+            m_glyphs.resize(m_glyphs.size() + size);
+            m_positions.resize(m_glyphs.size());
+            m_chars.resize(m_chars.size() + ti.num_chars);
+
+            glyph_t *glyphsDestination = m_glyphs.data() + currentItem.glyphOffset;
+            memcpy(glyphsDestination, glyphs.constData(), sizeof(glyph_t) * currentItem.numGlyphs);
+
+            QFixedPoint *positionsDestination = m_positions.data() + currentItem.positionOffset;
+            memcpy(positionsDestination, positions.constData(), sizeof(QFixedPoint) * currentItem.numGlyphs);
+
+            QChar *charsDestination = m_chars.data() + currentItem.charOffset;
+            memcpy(charsDestination, ti.chars, sizeof(QChar) * currentItem.numChars);
+
+            m_items.append(currentItem);
+        }
+
+        virtual void drawPolygon(const QPointF *, int , PolygonDrawMode )
+        {
+            /* intentionally empty */
+        }
+
+        virtual bool begin(QPaintDevice *)  { return true; }
+        virtual bool end() { return true; }
+        virtual void drawPixmap(const QRectF &, const QPixmap &, const QRectF &) {}
+        virtual Type type() const
+        {
+            return User;
+        }
+
+        QVector<QStaticTextItem> items() const
+        {
+            return m_items;
+        }
+
+        QVector<QFixedPoint> positions() const
+        {
+            return m_positions;
+        }
+
+        QVector<glyph_t> glyphs() const
+        {
+            return m_glyphs;
+        }
+
+        QVector<QChar> chars() const
+        {
+            return m_chars;
+        }
+
+    private:
+        QVector<QStaticTextItem> m_items;
+        QVector<QFixedPoint> m_positions;
+        QVector<glyph_t> m_glyphs;
+        QVector<QChar> m_chars;
+
+        bool m_dirtyPen;
+        bool m_useBackendOptimizations;
+        bool m_untransformedCoordinates;
+    };
+
+    class DrawTextItemDevice: public QPaintDevice
+    {
+    public:
+        DrawTextItemDevice(bool untransformedCoordinates, bool useBackendOptimizations)
+        {
+            m_paintEngine = new DrawTextItemRecorder(untransformedCoordinates,
+                                                     useBackendOptimizations);
+        }
+
+        ~DrawTextItemDevice()
+        {
+            delete m_paintEngine;
+        }
+
+        int metric(PaintDeviceMetric m) const
+        {
+            int val;
+            switch (m) {
+            case PdmWidth:
+            case PdmHeight:
+            case PdmWidthMM:
+            case PdmHeightMM:
+                val = 0;
+                break;
+            case PdmDpiX:
+            case PdmPhysicalDpiX:
+                val = qt_defaultDpiX();
+                break;
+            case PdmDpiY:
+            case PdmPhysicalDpiY:
+                val = qt_defaultDpiY();
+                break;
+            case PdmNumColors:
+                val = 16777216;
+                break;
+            case PdmDepth:
+                val = 24;
+                break;
+            default:
+                val = 0;
+                qWarning("DrawTextItemDevice::metric: Invalid metric command");
+            }
+            return val;
+        }
+
+        virtual QPaintEngine *paintEngine() const
+        {
+            return m_paintEngine;
+        }
+
+        QVector<glyph_t> glyphs() const
+        {
+            return m_paintEngine->glyphs();
+        }
+
+        QVector<QFixedPoint> positions() const
+        {
+            return m_paintEngine->positions();
+        }
+
+        QVector<QStaticTextItem> items() const
+        {
+            return m_paintEngine->items();
+        }
+
+        QVector<QChar> chars() const
+        {
+            return m_paintEngine->chars();
+        }
+
+    private:
+        DrawTextItemRecorder *m_paintEngine;
+    };
+}
+
+void QStaticTextPrivate::paintText(const QPointF &topLeftPosition, QPainter *p)
+{
+    bool preferRichText = textFormat == Qt::RichText
+                          || (textFormat == Qt::AutoText && Qt::mightBeRichText(text));
+
+    if (!preferRichText) {
+        QTextLayout textLayout;
+        textLayout.setText(text);
+        textLayout.setFont(font);
+        textLayout.setTextOption(textOption);
+
+        qreal leading = QFontMetricsF(font).leading();
+        qreal height = -leading;
+
+        textLayout.beginLayout();
+        while (1) {
+            QTextLine line = textLayout.createLine();
+            if (!line.isValid())
+                break;
+
+            if (textWidth >= 0.0)
+                line.setLineWidth(textWidth);
+            height += leading;
+            line.setPosition(QPointF(0.0, height));
+            height += line.height();
+        }
+        textLayout.endLayout();
+
+        actualSize = textLayout.boundingRect().size();
+        textLayout.draw(p, topLeftPosition);
+    } else {
+        QTextDocument document;
+#ifndef QT_NO_CSSPARSER
+        QColor color = p->pen().color();
+        document.setDefaultStyleSheet(QString::fromLatin1("body { color: #%1%2%3 }")
+                                      .arg(QString::number(color.red(), 16), 2, QLatin1Char('0'))
+                                      .arg(QString::number(color.green(), 16), 2, QLatin1Char('0'))
+                                      .arg(QString::number(color.blue(), 16), 2, QLatin1Char('0')));
+#endif
+        document.setDefaultFont(font);
+        document.setDocumentMargin(0.0);        
+#ifndef QT_NO_TEXTHTMLPARSER
+        document.setHtml(text);
+#else
+        document.setPlainText(text);
+#endif
+        if (textWidth >= 0.0)
+            document.setTextWidth(textWidth);
+        else
+            document.adjustSize();
+        document.setDefaultTextOption(textOption);
+
+        p->save();
+        p->translate(topLeftPosition);
+        QAbstractTextDocumentLayout::PaintContext ctx;
+        ctx.palette.setColor(QPalette::Text, p->pen().color());
+        document.documentLayout()->draw(p, ctx);
+        p->restore();
+
+        if (textWidth >= 0.0)
+            document.adjustSize(); // Find optimal size
+
+        actualSize = document.size();
+    }
+}
+
+void QStaticTextPrivate::init()
+{
+    delete[] items;
+    delete[] glyphPool;
+    delete[] positionPool;
+    delete[] charPool;
+
+    position = QPointF(0, 0);
+
+    DrawTextItemDevice device(untransformedCoordinates, useBackendOptimizations);
+    {
+        QPainter painter(&device);
+        painter.setFont(font);
+        painter.setTransform(matrix);
+
+        paintText(QPointF(0, 0), &painter);
+    }
+
+    QVector<QStaticTextItem> deviceItems = device.items();
+    QVector<QFixedPoint> positions = device.positions();
+    QVector<glyph_t> glyphs = device.glyphs();
+    QVector<QChar> chars = device.chars();
+
+    itemCount = deviceItems.size();
+    items = new QStaticTextItem[itemCount];
+
+    glyphPool = new glyph_t[glyphs.size()];
+    memcpy(glyphPool, glyphs.constData(), glyphs.size() * sizeof(glyph_t));
+
+    positionPool = new QFixedPoint[positions.size()];
+    memcpy(positionPool, positions.constData(), positions.size() * sizeof(QFixedPoint));
+
+    charPool = new QChar[chars.size()];
+    memcpy(charPool, chars.constData(), chars.size() * sizeof(QChar));
+
+    for (int i=0; i<itemCount; ++i) {
+        items[i] = deviceItems.at(i);
+
+        items[i].glyphs = glyphPool + items[i].glyphOffset;
+        items[i].glyphPositions = positionPool + items[i].positionOffset;
+        items[i].chars = charPool + items[i].charOffset;
+    }
+
+    needsRelayout = false;
+}
+
+QStaticTextItem::~QStaticTextItem()
+{
+    if (m_userData != 0 && !m_userData->ref.deref())
+        delete m_userData;
+    if (!m_fontEngine->ref.deref())
+        delete m_fontEngine;
+}
+
+void QStaticTextItem::setFontEngine(QFontEngine *fe)
+{
+    if (m_fontEngine != 0) {
+        if (!m_fontEngine->ref.deref())
+            delete m_fontEngine;
+    }
+
+    m_fontEngine = fe;
+    if (m_fontEngine != 0)
+        m_fontEngine->ref.ref();
+}
+
+QT_END_NAMESPACE