Fix OFX plugin render failures and stabilize integration tests

This commit resolves several categories of OFX plugin failures that
  manifested as magenta (pink) render output or crashes:

  1. Param default-value initialization
     - IntegerInstance, DoubleInstance, BooleanInstance, ChoiceInstance,
       and StringInstance now read kOfxParamPropDefault from the descriptor
       at construction time. Previously, when no PluginNode was attached
       (integration-test mode), get() returned 0/0.0/false, causing
       generator plugins to receive invalid extent/format/PAR values and
       crash in coordinate assertions.
     - IntegerInstance also fixed uninitialized `id` that caused
       kOfxStatErrBadHandle in CImg plugins.

  2. Clip property initialization
     - newClipInstance() now seeds pixelDepth and components from the
       host VideoParams instead of leaving them as None. This prevents
       Transform3x3Plugin and similar plugins from asserting on
       getPixelComponentCount() during fetchClip inside createInstance.
     - getAspectRatio() and getProjectPixelAspectRatio() now fall back
       to 1.0 when the project's PAR is not yet set, avoiding division-
       by-zero in coordinate conversion.

  3. Frame-rate and time-base preservation
     - setInputTexture() no longer overwrites the clip's frame_rate or
       time_base with the input texture's values. Multi-input plugins
       were crashing because setupClipPreferencesArgs throws when inputs
     have mismatched rates.

  4. Render loop hardening
     - getClipPreferences() is now wrapped in try/catch so that frame-
       rate mismatch exceptions mark render failure instead of aborting
       the render thread.
     - getRegionOfInterestAction() treats kOfxStatErrBadHandle as non-
       fatal and falls back to default RoI.
     - RenderPlugin syncs all clip instances after setVideoParam so that
       getAspectRatio/getFrameRate return valid values before
       createInstanceAction queries them.

  5. Test suite updates
     - All PluginMisc tests now use F32 input to match the host pipeline
       default.
     - CreateGradientTexture fixed to support F32 pixel format.
     - Added CImgBilateral and CImgGuided_MultiInput tests.
     - Secret parameters are now registered as hidden Node inputs so that
       getClipPreferences can read them (fixes generator pink screen).

  6. Debug logging in HostSupport
     - clipGetImage and clipGetRegionOfDefinition now catch exceptions
       and log the failing clip name for easier debugging.

app/pluginSupport/OliveClip.cpp

@@ -346,7 +346,11 @@ const std::string &olive::plugin::OliveClipInstance::getPremult() const
 }
 double olive::plugin::OliveClipInstance::getAspectRatio() const
 {
-	return params_.pixel_aspect_ratio().toDouble();
+	double par = params_.pixel_aspect_ratio().toDouble();
+	if (par == 0.0) {
+		return 1.0; // default PAR when not explicitly set
+	}
+	return par;
 }
 double olive::plugin::OliveClipInstance::getFrameRate() const
 {
@@ -569,7 +573,17 @@ void olive::plugin::OliveClipInstance::setInputTexture(TexturePtr texture, OfxTi
 	}
 	VideoParams incoming = texture->params();
 	
+	// Preserve time-related properties from the host/project.
+	// The frame rate of an OFX clip should reflect the project's frame rate,
+	// not the individual input texture's frame rate. If different inputs
+	// have different frame rates, setupClipPreferencesArgs throws an exception.
+	rational saved_frame_rate = params_.frame_rate();
+	rational saved_time_base = params_.time_base();
+	
 	this->params_ = incoming;
+	
+	params_.set_frame_rate(saved_frame_rate);
+	params_.set_time_base(saved_time_base);
 	// Note: We do NOT call setPixelDepth/setComponents here because
 	// those should be set by getClipPreferences to reflect the PLUGIN's
 	// preferred format, not the input texture's format.

app/pluginSupport/OlivePluginInstance.cpp

@@ -286,10 +286,11 @@ void OlivePluginInstance::getProjectExtent(double &xSize, double &ySize) const
 }
 double OlivePluginInstance::getProjectPixelAspectRatio() const
 {
-	return Current::getInstance()
-		.currentVideoParams()
-		.pixel_aspect_ratio()
-		.toDouble();
+	double par = params_.pixel_aspect_ratio().toDouble();
+	if (par == 0.0) {
+		return 1.0; // default PAR when not explicitly set
+	}
+	return par;
 }
 double OlivePluginInstance::getFrameRate() const
 {
@@ -550,7 +551,49 @@ OFX::Host::ImageEffect::ClipInstance *OlivePluginInstance::newClipInstance(
 	int index)
 {
 	// Create a new clip instance
-	OFX::Host::ImageEffect::ClipInstance* clipInstance = new OliveClipInstance(plugin, *descriptor, params_);
+	OliveClipInstance* clipInstance = new OliveClipInstance(plugin, *descriptor, params_);
+
+	// Initialize base class clip properties from VideoParams so that
+	// setupClipPreferencesArgs and plugin constructors (which may fetch
+	// clips and query their properties before getClipPreferences is called)
+	// have valid defaults instead of kOfxImageComponentNone / kOfxBitDepthNone.
+	std::string depth = kOfxBitDepthFloat;  // host default
+	std::string comp = kOfxImageComponentRGBA; // host default
+
+	switch (params_.format()) {
+	case core::PixelFormat::U8:
+		depth = kOfxBitDepthByte;
+		break;
+	case core::PixelFormat::U16:
+		depth = kOfxBitDepthShort;
+		break;
+	case core::PixelFormat::F16:
+		depth = kOfxBitDepthHalf;
+		break;
+	case core::PixelFormat::F32:
+		depth = kOfxBitDepthFloat;
+		break;
+	default:
+		break; // keep F32 default
+	}
+
+	switch (params_.channel_count()) {
+	case 1:
+		comp = kOfxImageComponentAlpha;
+		break;
+	case 3:
+		comp = kOfxImageComponentRGB;
+		break;
+	case 4:
+		comp = kOfxImageComponentRGBA;
+		break;
+	default:
+		break; // keep RGBA default
+	}
+
+	clipInstance->setPixelDepth(depth);
+	clipInstance->setComponents(comp);
+
 	return clipInstance;
 }
 

app/pluginSupport/OlivePluginInstance.h

@@ -67,7 +67,8 @@ public:
 		: Instance(instance._plugin, *instance._descriptor, instance._context,
 				   instance._interactive)
 	{
-		_clips=instance._clips;
+		// Do NOT shallow-copy _clips: Instance::~Instance() deletes them,
+		// which would cause a double-free. Clips are re-created in populate().
 		_created=instance._created;
 		_clipPrefsDirty=instance._clipPrefsDirty;
 		_continuousSamples=instance._continuousSamples;
@@ -75,7 +76,6 @@ public:
 		_outputPreMultiplication=instance._outputPreMultiplication;
 		_outputFielding=instance._outputFielding;
 		_outputFrameRate=instance._outputFrameRate;
-
 	}
 	explicit OlivePluginInstance(Instance & instance):Instance(instance){};
 	~OlivePluginInstance() override;

app/pluginSupport/paraminstance.h

@@ -112,7 +112,16 @@ public:
 		: OFX::Host::Param::IntegerInstance(descriptor, paramSet)
 		, _node(node)
 		, _descriptor(descriptor)
-	{}
+		, id(_descriptor.getName().c_str())
+	{
+		try {
+			value_ = _descriptor.getProperties().getIntProperty(kOfxParamPropDefault);
+			has_value_ = true;
+		} catch (...) {
+			value_ = 0;
+			has_value_ = false;
+		}
+	}
 	void SetNode(const std::shared_ptr<PluginNode> &new_node) override
 	{
 		_node = new_node;
@@ -128,7 +137,7 @@ public:
 		}
 		QVariant variant=_node->GetStandardValue(id);
 
-		if (variant.typeId()==QVariant::Int) {
+		if (variant.canConvert<int>()) {
 			a=variant.toInt();
 			return kOfxStatOK;
 		}
@@ -145,7 +154,7 @@ public:
 			return kOfxStatErrBadHandle;
 		}
 		QVariant variant=_node->GetValueAtTime(id, rational::fromDouble(time));
-		if (variant.typeId()==QVariant::Int) {
+		if (variant.canConvert<int>()) {
 			data=variant.toInt();
 			return kOfxStatOK;
 		}
@@ -165,7 +174,6 @@ public:
 		auto command = new NodeParamSetSplitStandardValueCommand(
 			NodeInput(_node.get(), _descriptor.getName().c_str()), split);
 		SubmitUndoCommand(_node, command, ParamChangeLabel(_descriptor));
-		id=_descriptor.getName().c_str();
 		return kOfxStatOK;
 	}
 	OfxStatus set(OfxTime time, int data)
@@ -180,7 +188,6 @@ public:
 			NodeInput(_node.get(), _descriptor.getName().c_str()),
 			rational::fromDouble(time), data, 0, command, true);
 		SubmitUndoCommand(_node, command, ParamChangeLabel(_descriptor));
-		id=_descriptor.getName().c_str();
 		return kOfxStatOK;
 	}
 };
@@ -200,6 +207,13 @@ public:
 		, _descriptor(descriptor)
 	{
 		(void)name;
+		try {
+			value_ = _descriptor.getProperties().getDoubleProperty(kOfxParamPropDefault);
+			has_value_ = true;
+		} catch (...) {
+			value_ = 0.0;
+			has_value_ = false;
+		}
 	}
 	void SetNode(const std::shared_ptr<PluginNode> &new_node) override
 	{
@@ -315,6 +329,8 @@ public:
 		, _descriptor(descriptor)
 	{
 		(void)name;
+		value_ = DefaultValue();
+		has_value_ = true;
 	}
 	void SetNode(const std::shared_ptr<PluginNode> &new_node) override
 	{
@@ -403,6 +419,13 @@ public:
 		, _descriptor(descriptor)
 	{
 		(void)name;
+		try {
+			value_ = _descriptor.getProperties().getIntProperty(kOfxParamPropDefault);
+			has_value_ = true;
+		} catch (...) {
+			value_ = 0;
+			has_value_ = false;
+		}
 	}
 	void SetNode(const std::shared_ptr<PluginNode> &new_node) override
 	{
@@ -1135,6 +1158,13 @@ public:
 		, _descriptor(descriptor)
 	{
 		(void)name;
+		try {
+			value_ = _descriptor.getProperties().getStringProperty(kOfxParamPropDefault);
+			has_value_ = true;
+		} catch (...) {
+			value_.clear();
+			has_value_ = false;
+		}
 	}
 	void SetNode(const std::shared_ptr<PluginNode> &new_node) override
 	{