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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the Qt Charts module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:GPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 or (at your option) any later version
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** approved by the KDE Free Qt Foundation. The licenses are as published by
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** the Free Software Foundation and appearing in the file LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "declarativechartnode.h"
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#include "declarativerendernode.h"
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#include <QtGui/QOpenGLContext>
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#include <QtGui/QOpenGLFunctions>
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#include <QtGui/QOpenGLFramebufferObjectFormat>
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#include <QtGui/QOpenGLFramebufferObject>
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#include <QOpenGLShaderProgram>
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#include <QtGui/QOpenGLBuffer>
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QT_CHARTS_BEGIN_NAMESPACE
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// This node handles displaying of the chart itself
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DeclarativeChartNode::DeclarativeChartNode(QQuickWindow *window) :
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QSGSimpleTextureNode(),
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m_texture(0),
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m_window(window),
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m_textureOptions(0),
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m_textureSize(1, 1),
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m_glRenderNode(0)
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{
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initializeOpenGLFunctions();
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// Our texture node must have a texture, so use a default one pixel texture
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GLuint defaultTexture = 0;
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glGenTextures(1, &defaultTexture);
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glBindTexture(GL_TEXTURE_2D, defaultTexture);
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uchar buf[4] = { 0, 0, 0, 0 };
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, &buf);
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QQuickWindow::CreateTextureOptions defaultTextureOptions = QQuickWindow::CreateTextureOptions(
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QQuickWindow::TextureHasAlphaChannel | QQuickWindow::TextureOwnsGLTexture);
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m_texture = m_window->createTextureFromId(defaultTexture, QSize(1, 1), defaultTextureOptions);
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setTexture(m_texture);
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setFiltering(QSGTexture::Linear);
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// Create child node for rendering GL graphics
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m_glRenderNode = new DeclarativeRenderNode(m_window);
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m_glRenderNode->setFlag(OwnedByParent);
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appendChildNode(m_glRenderNode);
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m_glRenderNode->setRect(0, 0, 0, 0); // Hide child node by default
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}
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DeclarativeChartNode::~DeclarativeChartNode()
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{
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delete m_texture;
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}
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// Must be called on render thread and in context
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void DeclarativeChartNode::createTextureFromImage(const QImage &chartImage)
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{
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if (chartImage.size() != m_textureSize)
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m_textureSize = chartImage.size();
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delete m_texture;
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m_texture = m_window->createTextureFromImage(chartImage, m_textureOptions);
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setTexture(m_texture);
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}
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QT_CHARTS_END_NAMESPACE
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