An element of a cache that contains the waveform data. More...

#include <WaveDataCache.h>

Inheritance diagram for WaveCacheElement:

Collaboration diagram for WaveCacheElement:

Public Types
using	Columns = std::array< WaveDisplayColumn, GraphicsDataCacheBase::CacheElementWidth >

Public Member Functions
void	Smooth (GraphicsDataCacheElementBase *prevElement) override
	This method is called during the lookup when new items are inserted. prevElement can be nullptr. Default implementation is empty. More...

Public Member Functions inherited from GraphicsDataCacheElementBase
virtual	~GraphicsDataCacheElementBase ()=default

virtual void	Dispose ()
	This method is called when the item is evicted from the cache. Default implementation is empty. More...

virtual void	Smooth (GraphicsDataCacheElementBase *prevElement)
	This method is called during the lookup when new items are inserted. prevElement can be nullptr. Default implementation is empty. More...

Public Attributes
Columns	Data

size_t	AvailableColumns { 0 }

Public Attributes inherited from GraphicsDataCacheElementBase
uint64_t	LastCacheAccess { 0 }
	Index filled by GraphicsDataCacheBase to implement LRU eviction policy. More...

uint64_t	LastUpdate { 0 }
	The last time the item was updated. If (!IsComplete && LastUpdate < LastCacheAccess) the item will be updated. More...

bool	IsComplete { false }
	Cache implementation is responsible to set this flag when all the data of the item is filled. More...

bool	AwaitsEviction { false }
	This flag is used to simplify the eviction algorithm. More...

Detailed Description

An element of a cache that contains the waveform data.

Definition at line 80 of file WaveDataCache.h.

Member Typedef Documentation

◆ Columns

using WaveCacheElement::Columns = std::array<WaveDisplayColumn, GraphicsDataCacheBase::CacheElementWidth>

Definition at line 82 of file WaveDataCache.h.

Member Function Documentation

◆ Smooth()

void WaveCacheElement::Smooth ( GraphicsDataCacheElementBase * prevElement )

overridevirtual

This method is called during the lookup when new items are inserted. prevElement can be nullptr. Default implementation is empty.

Reimplemented from GraphicsDataCacheElementBase.

Definition at line 466 of file WaveDataCache.cpp.

{
   if (prevElement == nullptr||prevElement->AwaitsEviction || AvailableColumns == 0)
      return;
 
   const auto prev = static_cast<WaveCacheElement*>(prevElement);
 
   if (prev->AvailableColumns == 0)
      return;
 
   const auto prevLastColumn = prev->Data[prev->AvailableColumns - 1];
   auto& firstColumn          = Data[0];
 
   bool updated = false;
 
   if (prevLastColumn.min > firstColumn.max)
   {
      firstColumn.max = prevLastColumn.min;
      updated         = true;
   }
 
   if (prevLastColumn.max < firstColumn.min)
   {
      firstColumn.min = prevLastColumn.max;
      updated         = true;
   }
 
   if (updated)
      firstColumn.rms =
         std::clamp(firstColumn.rms, firstColumn.min, firstColumn.max);
}

References AvailableColumns, GraphicsDataCacheElementBase::AwaitsEviction, and Data.

Member Data Documentation

◆ AvailableColumns

size_t WaveCacheElement::AvailableColumns { 0 }

Definition at line 86 of file WaveDataCache.h.

Referenced by WaveDataCache::InitializeElement(), and Smooth().

◆ Data

Columns WaveCacheElement::Data

Definition at line 85 of file WaveDataCache.h.

Referenced by WaveDataCache::InitializeElement(), and Smooth().

The documentation for this struct was generated from the following files:

Public Types

Public Member Functions

Public Attributes