Maria::SymbolCache Class Reference

#include <MSymbolCache.h>

Classes
struct	SymbolCell

Public Types
using	SymbolIndexT = std::uint32_t
using	LayerIndexT = std::uint16_t

Public Member Functions
	SymbolCache (const std::shared_ptr< STK::ShaderProgramManager > &shaderManager, const std::shared_ptr< Maria::ISymbolProvider > &symbolProvider, std::uint16_t gridSize=32, std::uint16_t cellSize=64, double symbolScale=1.0)
uint32_t	getSymbolCacheId () const
SymbolIndexT	getSymbolIndex (const std::string &symbolType, const std::string &symbolCode, SymbolColorScheme colorScheme=SymbolColorScheme::Medium)
SymbolIndexT	getSymbolIndex (const std::string &symbolType, const std::string &symbolCode, const std::string &typeId, SymbolColorScheme colorScheme=SymbolColorScheme::Medium)
bool	getSymbolIndex (const std::string &symbolType, const std::string &symbolCode, SymbolColorScheme colorScheme, const std::string &typeId, SymbolIndexT &index, float &centerX, float &centerY)
void	updateTexture ()
void	setSymbolGrid (int gridSize, int cellSize)
int	numPendingRequests () const
std::shared_ptr< Maria::SymbolTexture >	getSymbolTexture (LayerIndexT layer)
GLuint	getTextureHandle (const LayerIndexT layer)
STK::Vector4f	calcTextureTransform (const SymbolIndexT symbolIndex) const
auto	getGridSize () const
auto	getCellSize () const
LayerIndexT	calcLayer (const SymbolIndexT symbolIndex) const
void	freeSymbol (SymbolIndexT symbolIndex)
bool	needsRedraw () const

Protected Member Functions
decltype(_symbols) ::iterator	findOldestSymbol ()
void	updateTexture (const MariaProtobuf::SymbolProviderResult &sym)
bool	InitShader ()
std::shared_ptr< SymbolTexture >	getSymbolFBO (LayerIndexT layer)
std::shared_ptr< STK::Image >	createImage (const MariaProtobuf::SymbolProviderResult &sym)
std::string	createKey (const std::string &symbolType, const std::string &symbolCode, SymbolColorScheme colorScheme)
SymbolIndexT	getNewId ()

Protected Attributes
unsigned int	_symbolCacheId {0}
std::shared_ptr< STK::ShaderProgramManager >	_shaderManager
std::shared_ptr< Maria::ISymbolProvider >	_symbolProvider
std::uint16_t	_gridSize { 32 }
std::uint16_t	_cellSize { 64 }
bool	_stretchToFrame { true }
bool	_cropTransparent { true }
double	_symbolScale { 1.0 }
std::list< SymbolIndexT >	_freeIds
std::atomic< int >	_numPendingRequests { 0 }
std::shared_ptr< STK::VertexBufferP >	quad_vtx_
std::shared_ptr< STK::ShaderProgram >	_shader
std::vector< std::shared_ptr< Maria::SymbolTexture > >	_symbolSheets
int	_texUnit
bool	_generateMipmaps
std::map< std::string, SymbolCell >	_symbols

Detailed Description

SymbolCache - Short description. Detailed description.

Member Function Documentation

calcLayer()

LayerIndexT Maria::SymbolCache::calcLayer ( const SymbolIndexT  symbolIndex ) const

inline

Calculate which texture layer this index belongs to.

calcTextureTransform()

STK::Vector4f Maria::SymbolCache::calcTextureTransform ( const SymbolIndexT  symbolIndex ) const

inline

Calculate a texture transform offset/scale given a symbol index. This will return 4 values (x offset, y offset, x scale, y scale) representing the scale and offset of the given symbol inside a texture atlas sheet.

freeSymbol()

void Maria::SymbolCache::freeSymbol ( SymbolIndexT  symbolIndex )

inline

Mark this symbol ID as free, so that it can be recycled.

getCellSize()

auto Maria::SymbolCache::getCellSize ( ) const

inline

Get the size of each grid cell. This is also the maximum resolution of the symbols in the cache.

getGridSize()

auto Maria::SymbolCache::getGridSize ( ) const

inline

Return the grid size. The grid size defines both the number of columns and rows on each level of the texture array.

getSymbolIndex()

SymbolCache::SymbolIndexT SymbolCache::getSymbolIndex	(	const std::string &	symbolType,
		const std::string &	symbolCode,
		SymbolColorScheme	colorScheme = SymbolColorScheme::Medium
	)

Get the symbol index for the given symbol. This method will check the cache for the given symbol code. If not found, a new index is reserved and a request is made to the symbol service for this symbol code. Until the symbol has been received and the texture has been updated, this index will give a blank texture.

setSymbolGrid()

void SymbolCache::setSymbolGrid	(	int	gridSize,
		int	cellSize
	)

Set new symbol grid sizes. This method sets the maximum pixel size of each cached symbol cell, and the grid size of the cache. Each texture layer in the cache can contain gridSize x gridSize symbols, and the texture size is gridSize*cellSize. This will clear all currently cached symbols.

updateTexture()

void SymbolCache::updateTexture

(

)

Update texture with all new symbols that have been read from the provider since the last time. This method should be called from the render thread.

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

• Native/MariaNative/MDrawObject/MSymbolCache.h
• Native/MariaNative/MDrawObject/MSymbolCache.cpp