ImageCache Class Reference

Internal image cache. More...

Public Member Functions
void	clear ()
	Clear the image cache. More...
shared_cairo_surface_t	get (const std::string &uri, float hscale=1.0, float vscale=1.0, bool approximate=true)
	Get an image surface. More...

Static Public Member Functions
static shared_cairo_surface_t	scale_surface (const shared_cairo_surface_t &old_surface, float old_width, float old_height, float new_width, float new_height)

Static Protected Member Functions
static std::string	id (const std::string &name, float hscale, float vscale)
static float	round (float v, float fraction)

Protected Attributes
std::map< std::string, shared_cairo_surface_t >	m_cache

Detailed Description

Internal image cache.

Provides an in-memory cache for images based on name and scale. This prevents multiple attempts at loading the same file as well as re-scaling the image to the same scale multiple times.

This is a trade off in consuming more memory instead of possibly constantly reloading or scaling the same image.

Member Function Documentation

clear()

void clear

(

)

Clear the image cache.

get()

shared_cairo_surface_t get	(	const std::string &	uri,
		float	hscale = 1.0,
		float	vscale = 1.0,
		bool	approximate = true
	)

Get an image surface.

id()

static std::string id ( const std::string &  name, float  hscale, float  vscale  )

staticprotected

round()

static float round ( float  v, float  fraction  )

staticprotected

scale_surface()

static shared_cairo_surface_t scale_surface ( const shared_cairo_surface_t &  old_surface, float  old_width, float  old_height, float  new_width, float  new_height  )

static

Member Data Documentation

m_cache

std::map<std::string, shared_cairo_surface_t> m_cache

protected