lmms::SampleThumbnail Class Reference

#include <SampleThumbnail.h>

Classes
struct	VisualizeParameters
class	Thumbnail
struct	SampleThumbnailEntry
struct	Hash

Public Member Functions
	SampleThumbnail ()=default
	SampleThumbnail (const Sample &sample)
void	visualize (VisualizeParameters parameters, QPainter &painter) const

Private Types
using	ThumbnailCache = std::vector<Thumbnail>

Private Attributes
std::shared_ptr< ThumbnailCache >	m_thumbnailCache = std::make_shared<ThumbnailCache>()
std::shared_ptr< const SampleBuffer >	m_buffer = SampleBuffer::emptyBuffer()

Static Private Attributes
static std::unordered_map< SampleThumbnailEntry, std::shared_ptr< ThumbnailCache >, Hash >	s_sampleThumbnailCacheMap

Detailed Description

Allows for visualizing sample data.

On construction, thumbnails will be generated at logarathmic intervals of downsampling. Those cached thumbnails will then be further downsampled on the fly and transformed in various ways to create the desired waveform.

Given that we are dealing with far less data to generate the visualization however (i.e., we are not reading from original sample data when drawing), this provides a significant performance boost that wouldn't be possible otherwise.

Member Typedef Documentation

ThumbnailCache

using lmms::SampleThumbnail::ThumbnailCache = std::vector<Thumbnail>

private

Constructor & Destructor Documentation

SampleThumbnail() [1/2]

lmms::SampleThumbnail::SampleThumbnail ( )

default

SampleThumbnail() [2/2]

lmms::SampleThumbnail::SampleThumbnail

(

const Sample &

sample

)

Member Function Documentation

visualize()

void lmms::SampleThumbnail::visualize	(	VisualizeParameters	parameters,
		QPainter &	painter ) const

Member Data Documentation

m_buffer

std::shared_ptr<const SampleBuffer> lmms::SampleThumbnail::m_buffer = SampleBuffer::emptyBuffer()

private

m_thumbnailCache

std::shared_ptr<ThumbnailCache> lmms::SampleThumbnail::m_thumbnailCache = std::make_shared<ThumbnailCache>()

private

s_sampleThumbnailCacheMap

std::unordered_map<SampleThumbnailEntry, std::shared_ptr<ThumbnailCache>, Hash> lmms::SampleThumbnail::s_sampleThumbnailCacheMap

inlinestaticprivate

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

• /home/runner/work/lmms-fork/lmms-fork/include/SampleThumbnail.h
• /home/runner/work/lmms-fork/lmms-fork/src/gui/SampleThumbnail.cpp