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141 lines
3.3 KiB
C++
141 lines
3.3 KiB
C++
#include "nmVTKRenderLayer.h"
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#include <QCoreApplication>
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#include <QThread>
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#include <vtkProp.h>
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#include <vtkRenderer.h>
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namespace {
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// VTK 对象没有跨线程保护，所有图层状态必须在 GUI 线程修改。
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bool isLayerGuiThread()
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{
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QCoreApplication* pApplication = QCoreApplication::instance();
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return pApplication == NULL ||
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pApplication->thread() == QThread::currentThread();
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}
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}
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nmVTKRenderLayer::nmVTKRenderLayer(const QString& sLayerId)
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: m_sLayerId(sLayerId),
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m_bVisible(true),
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m_pRenderProp(NULL),
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m_pRenderer(NULL),
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m_pOwningScene(NULL)
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{
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Q_ASSERT(isLayerGuiThread());
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// 稳定 ID 只用于 Scene 查找，不承担可翻译的界面文案。
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}
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nmVTKRenderLayer::~nmVTKRenderLayer()
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{
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Q_ASSERT(isLayerGuiThread());
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Q_ASSERT(m_pOwningScene == NULL);
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// 主 Prop 由基类智能指针继续持有，因此此时 detach 不依赖派生类成员。
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detach();
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m_pRenderProp = NULL;
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m_pOwningScene = NULL;
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}
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QString nmVTKRenderLayer::getLayerId() const
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{
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return m_sLayerId;
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}
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bool nmVTKRenderLayer::attach(vtkRenderer* pRenderer)
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{
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Q_ASSERT(isLayerGuiThread());
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if(!isLayerGuiThread() || pRenderer == NULL || m_pRenderProp == NULL) {
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return false;
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}
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if(m_pRenderer == pRenderer) {
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// 幂等挂载不重复增加 Renderer 对 Prop 的引用。
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return true;
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}
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// 一个图层同一时刻只能挂载到一个 Renderer。
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detach();
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m_pRenderProp->SetVisibility(m_bVisible ? 1 : 0);
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pRenderer->AddViewProp(m_pRenderProp);
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m_pRenderer = pRenderer;
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return true;
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}
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void nmVTKRenderLayer::detach()
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{
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Q_ASSERT(isLayerGuiThread());
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if(m_pRenderer != NULL && m_pRenderProp != NULL) {
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m_pRenderer->RemoveViewProp(m_pRenderProp);
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}
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m_pRenderer = NULL;
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}
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void nmVTKRenderLayer::setVisible(bool bVisible)
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{
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Q_ASSERT(isLayerGuiThread());
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if(!isLayerGuiThread()) {
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return;
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}
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m_bVisible = bVisible;
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if(m_pRenderProp != NULL) {
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m_pRenderProp->SetVisibility(bVisible ? 1 : 0);
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}
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}
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bool nmVTKRenderLayer::isVisible() const
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{
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return m_bVisible;
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}
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bool nmVTKRenderLayer::isAttached() const
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{
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return m_pRenderer != NULL;
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}
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bool nmVTKRenderLayer::setRenderProp(vtkProp* pProp)
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{
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Q_ASSERT(isLayerGuiThread());
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if(!isLayerGuiThread() || isAttached() || pProp == NULL) {
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return false;
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}
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// vtkSmartPointer 接管一个 VTK 引用，派生类可继续持有同一对象。
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m_pRenderProp = pProp;
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m_pRenderProp->SetVisibility(m_bVisible ? 1 : 0);
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return true;
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}
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vtkProp* nmVTKRenderLayer::getRenderProp() const
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{
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return m_pRenderProp;
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}
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vtkRenderer* nmVTKRenderLayer::getAttachedRenderer() const
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{
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return m_pRenderer;
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}
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bool nmVTKRenderLayer::claimSceneOwnership(nmVTKScene* pScene)
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{
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Q_ASSERT(isLayerGuiThread());
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if(!isLayerGuiThread() || pScene == NULL || m_pOwningScene != NULL) {
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return false;
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}
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// 所有权与 Renderer 挂载状态分开记录，公开 detach 不会释放 Scene 所有权。
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m_pOwningScene = pScene;
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return true;
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}
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bool nmVTKRenderLayer::releaseSceneOwnership(nmVTKScene* pScene)
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{
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Q_ASSERT(isLayerGuiThread());
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if(!isLayerGuiThread() || pScene == NULL || m_pOwningScene != pScene) {
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return false;
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}
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m_pOwningScene = NULL;
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return true;
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}
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