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Diffstat (limited to 'examples/qws/svgalib/svgalibpaintengine.cpp')
| -rw-r--r-- | examples/qws/svgalib/svgalibpaintengine.cpp | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/examples/qws/svgalib/svgalibpaintengine.cpp b/examples/qws/svgalib/svgalibpaintengine.cpp new file mode 100644 index 0000000000..3621db7a43 --- /dev/null +++ b/examples/qws/svgalib/svgalibpaintengine.cpp @@ -0,0 +1,192 @@ +/**************************************************************************** +** +** 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 ®ion) +{ + 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] |