Long live Qt 4.5!

1 files changed, 192 insertions, 0 deletions

diff --git a/examples/qws/svgalib/svgalibpaintengine.cpp b/examples/qws/svgalib/svgalibpaintengine.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "svgalibpaintengine.h"
+
+#include <QColor>
+#include <vga.h>
+#include <vgagl.h>
+
+SvgalibPaintEngine::SvgalibPaintEngine()
+{
+}
+
+SvgalibPaintEngine::~SvgalibPaintEngine()
+{
+}
+
+//! [0]
+bool SvgalibPaintEngine::begin(QPaintDevice *dev)
+{
+    device = dev;
+    pen = Qt::NoPen;
+    simplePen = true;
+    brush = Qt::NoBrush;
+    simpleBrush = true;
+    matrix = QMatrix();
+    simpleMatrix = true;
+    setClip(QRect(0, 0, device->width(), device->height()));
+    opaque = true;
+    aliased = true;
+    sourceOver = true;
+
+    return QRasterPaintEngine::begin(dev);
+}
+//! [0]
+
+//! [1]
+bool SvgalibPaintEngine::end()
+{
+    gl_setclippingwindow(0, 0, device->width() - 1, device->height() - 1);
+    return QRasterPaintEngine::end();
+}
+//! [1]
+
+//! [2]
+void SvgalibPaintEngine::updateState(const QPaintEngineState &state)
+{
+    QPaintEngine::DirtyFlags flags = state.state();
+
+    if (flags & DirtyTransform) {
+        matrix = state.matrix();
+        simpleMatrix = (matrix.m12() == 0 && matrix.m21() == 0);
+    }
+
+    if (flags & DirtyPen) {
+        pen = state.pen();
+        simplePen = (pen.width() == 0 || pen.widthF() <= 1)
+                    && (pen.style() == Qt::NoPen || pen.style() == Qt::SolidLine)
+                    && (pen.color().alpha() == 255);
+    }
+
+    if (flags & DirtyBrush) {
+        brush = state.brush();
+        simpleBrush = (brush.style() == Qt::SolidPattern
+                       || brush.style() == Qt::NoBrush)
+                      && (brush.color().alpha() == 255);
+    }
+
+    if (flags & DirtyClipRegion)
+        setClip(state.clipRegion());
+
+    if (flags & DirtyClipEnabled) {
+        clipEnabled = state.isClipEnabled();
+        updateClip();
+    }
+
+    if (flags & DirtyClipPath) {
+        setClip(QRegion());
+        simpleClip = false;
+    }
+
+    if (flags & DirtyCompositionMode) {
+        const QPainter::CompositionMode m = state.compositionMode();
+        sourceOver = (m == QPainter::CompositionMode_SourceOver);
+    }
+
+    if (flags & DirtyOpacity)
+        opaque = (state.opacity() == 256);
+
+    if (flags & DirtyHints)
+        aliased = !(state.renderHints() & QPainter::Antialiasing);
+
+    QRasterPaintEngine::updateState(state);
+}
+//! [2]
+
+//! [3]
+void SvgalibPaintEngine::setClip(const QRegion &region)
+{
+    if (region.isEmpty())
+        clip = QRect(0, 0, device->width(), device->height());
+    else
+        clip = matrix.map(region) & QRect(0, 0, device->width(), device->height());
+    clipEnabled = true;
+    updateClip();
+}
+//! [3]
+
+//! [4]
+void SvgalibPaintEngine::updateClip()
+{
+    QRegion clipRegion = QRect(0, 0, device->width(), device->height());
+
+    if (!systemClip().isEmpty())
+        clipRegion &= systemClip();
+    if (clipEnabled)
+        clipRegion &= clip;
+
+    simpleClip = (clipRegion.rects().size() <= 1);
+
+    const QRect r = clipRegion.boundingRect();
+    gl_setclippingwindow(r.left(), r.top(),
+                         r.x() + r.width(),
+                         r.y() + r.height());
+}
+//! [4]
+
+//! [5]
+void SvgalibPaintEngine::drawRects(const QRect *rects, int rectCount)
+{
+    const bool canAccelerate = simplePen && simpleBrush && simpleMatrix
+                               && simpleClip && opaque && aliased
+                               && sourceOver;
+    if (!canAccelerate) {
+        QRasterPaintEngine::drawRects(rects, rectCount);
+        return;
+    }
+
+    for (int i = 0; i < rectCount; ++i) {
+        const QRect r = matrix.mapRect(rects[i]);
+        if (brush != Qt::NoBrush) {
+            gl_fillbox(r.left(), r.top(), r.width(), r.height(),
+                       brush.color().rgba());
+        }
+        if (pen != Qt::NoPen) {
+            const int c = pen.color().rgba();
+            gl_hline(r.left(), r.top(), r.right(), c);
+            gl_hline(r.left(), r.bottom(), r.right(), c);
+            gl_line(r.left(), r.top(), r.left(), r.bottom(), c);
+            gl_line(r.right(), r.top(), r.right(), r.bottom(), c);
+        }
+    }
+}
+//! [5]