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Diffstat (limited to 'src/opengl/qopengl2pexvertexarray.cpp')
| -rw-r--r-- | src/opengl/qopengl2pexvertexarray.cpp | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/opengl/qopengl2pexvertexarray.cpp b/src/opengl/qopengl2pexvertexarray.cpp new file mode 100644 index 0000000000..df0fb764c9 --- /dev/null +++ b/src/opengl/qopengl2pexvertexarray.cpp @@ -0,0 +1,173 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtOpenGL module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qopengl2pexvertexarray_p.h" + +#include <private/qbezier_p.h> + +QT_BEGIN_NAMESPACE + +void QOpenGL2PEXVertexArray::clear() +{ + vertexArray.reset(); + vertexArrayStops.reset(); + boundingRectDirty = true; +} + + +QOpenGLRect QOpenGL2PEXVertexArray::boundingRect() const +{ + if (boundingRectDirty) + return QOpenGLRect(0.0, 0.0, 0.0, 0.0); + else + return QOpenGLRect(minX, minY, maxX, maxY); +} + +void QOpenGL2PEXVertexArray::addClosingLine(int index) +{ + QPointF point(vertexArray.at(index)); + if (point != QPointF(vertexArray.last())) + vertexArray.add(point); +} + +void QOpenGL2PEXVertexArray::addCentroid(const QVectorPath &path, int subPathIndex) +{ + const QPointF *const points = reinterpret_cast<const QPointF *>(path.points()); + const QPainterPath::ElementType *const elements = path.elements(); + + QPointF sum = points[subPathIndex]; + int count = 1; + + for (int i = subPathIndex + 1; i < path.elementCount() && (!elements || elements[i] != QPainterPath::MoveToElement); ++i) { + sum += points[i]; + ++count; + } + + const QPointF centroid = sum / qreal(count); + vertexArray.add(centroid); +} + +void QOpenGL2PEXVertexArray::addPath(const QVectorPath &path, GLfloat curveInverseScale, bool outline) +{ + const QPointF* const points = reinterpret_cast<const QPointF*>(path.points()); + const QPainterPath::ElementType* const elements = path.elements(); + + if (boundingRectDirty) { + minX = maxX = points[0].x(); + minY = maxY = points[0].y(); + boundingRectDirty = false; + } + + if (!outline && !path.isConvex()) + addCentroid(path, 0); + + int lastMoveTo = vertexArray.size(); + vertexArray.add(points[0]); // The first element is always a moveTo + + do { + if (!elements) { +// qDebug("QVectorPath has no elements"); + // If the path has a null elements pointer, the elements implicitly + // start with a moveTo (already added) and continue with lineTos: + for (int i=1; i<path.elementCount(); ++i) + lineToArray(points[i].x(), points[i].y()); + + break; + } +// qDebug("QVectorPath has element types"); + + for (int i=1; i<path.elementCount(); ++i) { + switch (elements[i]) { + case QPainterPath::MoveToElement: + if (!outline) + addClosingLine(lastMoveTo); +// qDebug("element[%d] is a MoveToElement", i); + vertexArrayStops.add(vertexArray.size()); + if (!outline) { + if (!path.isConvex()) addCentroid(path, i); + lastMoveTo = vertexArray.size(); + } + lineToArray(points[i].x(), points[i].y()); // Add the moveTo as a new vertex + break; + case QPainterPath::LineToElement: +// qDebug("element[%d] is a LineToElement", i); + lineToArray(points[i].x(), points[i].y()); + break; + case QPainterPath::CurveToElement: { + QBezier b = QBezier::fromPoints(*(((const QPointF *) points) + i - 1), + points[i], + points[i+1], + points[i+2]); + QRectF bounds = b.bounds(); + // threshold based on same algorithm as in qtriangulatingstroker.cpp + int threshold = qMin<float>(64, qMax(bounds.width(), bounds.height()) * 3.14f / (curveInverseScale * 6)); + if (threshold < 3) threshold = 3; + qreal one_over_threshold_minus_1 = qreal(1) / (threshold - 1); + for (int t=0; t<threshold; ++t) { + QPointF pt = b.pointAt(t * one_over_threshold_minus_1); + lineToArray(pt.x(), pt.y()); + } + i += 2; + break; } + default: + break; + } + } + } while (0); + + if (!outline) + addClosingLine(lastMoveTo); + vertexArrayStops.add(vertexArray.size()); +} + +void QOpenGL2PEXVertexArray::lineToArray(const GLfloat x, const GLfloat y) +{ + vertexArray.add(QOpenGLPoint(x, y)); + + if (x > maxX) + maxX = x; + else if (x < minX) + minX = x; + if (y > maxY) + maxY = y; + else if (y < minY) + minY = y; +} + +QT_END_NAMESPACE |