xmario/xSDL/xSpriteAnimation.cpp

#include "xSpriteAnimation.h"

/** clean SDL objects and frames */
xSpriteAnimation::~xSpriteAnimation(){
	_mutex.try_lock();
	SDL_FreeSurface( _surface );
	_frames.erase( _frames.begin(), _frames.end() );
	_mutex.unlock();
}

/** builds an animation */
xSpriteAnimation::xSpriteAnimation(const char *url, SDL_Rect dest)
: xSprite( url ){
	this->dimensions(dest);
}


/** builds an animation from an existing surface */
xSpriteAnimation::xSpriteAnimation(SDL_Surface *s, SDL_Rect dest)
: xSprite(s) {
	this->dimensions(dest);
}

/** adds an animation frame */
void xSpriteAnimation::addFrame(SDL_Rect clip){
	_mutex_frames.try_lock();
	_frames.push_back( (SDL_Rect){
		clip.x,
		clip.y,
		clip.w,
		clip.h
	} );
	_mutex_frames.unlock();
}

/** clears all frames */
void xSpriteAnimation::clearFrames(){
	_mutex_frames.try_lock();
	_frames.erase(_frames.begin(), _frames.end());
	_mutex_frames.unlock();
}

/** draw to scene */
void xSpriteAnimation::draw(SDL_Renderer* renderer){
	_mutex.try_lock();
	SDL_RenderCopy(
		renderer,
		SDL_CreateTextureFromSurface(renderer, this->surface()),
		this->src(),
		this->dst()
	);
	_mutex.unlock();
}

/** animation process */
void xSpriteAnimation::tick(const uint32_t ticks){
	_mutex_frames.try_lock();
	uint32_t time_index  = ticks / _interval;
	size_t   frame_index = time_index % _frames.size();

	// update current frame clip
	_src = _frames.at(frame_index);
	_mutex_frames.unlock();
}


/** adds the animation to the render */
void xSpriteAnimation::start(uint32_t interval){
	_interval = interval;
	xApplication::get()->addOrchestrable(this);
}

/** stops the animation */
void xSpriteAnimation::stop(){
	xApplication::get()->removeOrchestrable(this);
}