declarativechartnode.cpp
78 lines
| 2.7 KiB
| text/x-c
|
CppLexer
Miikka Heikkinen
|
r2820 | /**************************************************************************** | ||
| ** | ||||
| ** Copyright (C) 2015 The Qt Company Ltd | ||||
| ** All rights reserved. | ||||
| ** For any questions to The Qt Company, please use contact form at http://qt.io | ||||
| ** | ||||
| ** This file is part of the Qt Charts module. | ||||
| ** | ||||
| ** Licensees holding valid commercial license for Qt may use this file in | ||||
| ** accordance with the Qt License Agreement provided with the Software | ||||
| ** or, alternatively, in accordance with the terms contained in a written | ||||
| ** agreement between you and The Qt Company. | ||||
| ** | ||||
| ** If you have questions regarding the use of this file, please use | ||||
| ** contact form at http://qt.io | ||||
| ** | ||||
| ****************************************************************************/ | ||||
| #include "declarativechartnode.h" | ||||
| #include "declarativerendernode.h" | ||||
| #include <QtGui/QOpenGLContext> | ||||
| #include <QtGui/QOpenGLFunctions> | ||||
| #include <QtGui/QOpenGLFramebufferObjectFormat> | ||||
| #include <QtGui/QOpenGLFramebufferObject> | ||||
| #include <QOpenGLShaderProgram> | ||||
| #include <QtGui/QOpenGLBuffer> | ||||
| QT_CHARTS_BEGIN_NAMESPACE | ||||
| // This node handles displaying of the chart itself | ||||
| DeclarativeChartNode::DeclarativeChartNode(QQuickWindow *window) : | ||||
| QSGSimpleTextureNode(), | ||||
| m_texture(0), | ||||
| m_window(window), | ||||
| m_textureOptions(0), | ||||
| m_textureSize(1, 1), | ||||
| m_glRenderNode(0) | ||||
| { | ||||
| initializeOpenGLFunctions(); | ||||
| // Our texture node must have a texture, so use a default one pixel texture | ||||
| GLuint defaultTexture = 0; | ||||
| glGenTextures(1, &defaultTexture); | ||||
| glBindTexture(GL_TEXTURE_2D, defaultTexture); | ||||
| uchar buf[4] = { 0, 0, 0, 0 }; | ||||
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, &buf); | ||||
| QQuickWindow::CreateTextureOptions defaultTextureOptions = QQuickWindow::CreateTextureOptions( | ||||
| QQuickWindow::TextureHasAlphaChannel | QQuickWindow::TextureOwnsGLTexture); | ||||
| m_texture = m_window->createTextureFromId(defaultTexture, QSize(1, 1), defaultTextureOptions); | ||||
| setTexture(m_texture); | ||||
| setFiltering(QSGTexture::Linear); | ||||
| // Create child node for rendering GL graphics | ||||
| m_glRenderNode = new DeclarativeRenderNode(m_window); | ||||
| m_glRenderNode->setFlag(OwnedByParent); | ||||
| appendChildNode(m_glRenderNode); | ||||
| m_glRenderNode->setRect(0, 0, 0, 0); // Hide child node by default | ||||
| } | ||||
| DeclarativeChartNode::~DeclarativeChartNode() | ||||
| { | ||||
| delete m_texture; | ||||
| } | ||||
| // Must be called on render thread and in context | ||||
| void DeclarativeChartNode::createTextureFromImage(const QImage &chartImage) | ||||
| { | ||||
| if (chartImage.size() != m_textureSize) | ||||
| m_textureSize = chartImage.size(); | ||||
| delete m_texture; | ||||
| m_texture = m_window->createTextureFromImage(chartImage, m_textureOptions); | ||||
| setTexture(m_texture); | ||||
| } | ||||
| QT_CHARTS_END_NAMESPACE | ||||