Sprite::Loader Class Reference

Use this class to load a Sprite asynchronously. More...

#include <jngl/sprite.hpp>

Public Member Functions
	Loader (std::string filename) noexcept
	Starts a thread to load filename and returns instantly.
	~Loader () noexcept
	Blocks until the Sprite has been loaded.
std::shared_ptr< Sprite >	shared () const
	Blocks until the Sprite has been loaded and returns a non-nullptr std::shared_ptr.
	operator bool () const
	Returns whether the sprite has been loaded, does NOT block.
Sprite *	operator-> () const
	Blocks until the Sprite has been loaded.

Detailed Description

Use this class to load a Sprite asynchronously.

Example:

class MyGame : public jngl::Work {
    void step() override {}
    void draw() const override {
        if (mySprite) {
            mySprite->draw();
        } else {
            jngl::print("loading...", jngl::Vec2(0, 0));
        }
    }
 
    jngl::Sprite::Loader mySprite{ "foo.webp" };
};

Definition at line 84 of file sprite.hpp.

Constructor & Destructor Documentation

Loader()

Loader ( std::string filename )

explicitnoexcept

Starts a thread to load filename and returns instantly.

Note that if the file couldn't be found this will not throw. Instead the exception will be thrown on first use by shared() or operator->().

~Loader()

~Loader ( )

noexcept

Blocks until the Sprite has been loaded.

While you won't have access to std::shared_ptr returned by shared(), the Sprite will still be loaded into JNGL's cache and the next time you create a Sprite from this filename, you'll get the same std::shared_ptr.

If shared() or operator->() haven't been called yet and the file wasn't found the destructor won't throw but use errorMessage(const std::string&).

Member Function Documentation

shared()

std::shared_ptr< Sprite > shared

(

)

const

Blocks until the Sprite has been loaded and returns a non-nullptr std::shared_ptr.

Exceptions

std::runtime_error

on decoding errors or file not found

operator bool()

operator bool

(

)

const

Returns whether the sprite has been loaded, does NOT block.

After this returned true all other methods won't block any more.

operator->()

Sprite * operator->

(

)

const

Blocks until the Sprite has been loaded.

Exceptions

std::runtime_error

on decoding errors or file not found

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

• jngl/sprite.hpp