src/shapes/path_composer.cpp

#include "rive/shapes/path_composer.hpp"
#include "rive/artboard.hpp"
#include "rive/renderer.hpp"
#include "rive/shapes/path.hpp"
#include "rive/shapes/shape.hpp"

using namespace rive;

static Mat2D identity;

PathComposer::PathComposer(Shape* shape) : m_Shape(shape) {}
PathComposer::~PathComposer()
{
	delete m_LocalPath;
	delete m_WorldPath;
}

void PathComposer::buildDependencies()
{
	assert(m_Shape != nullptr);
	m_Shape->addDependent(this);
	for (auto path : m_Shape->paths())
	{
		path->addDependent(this);
	}
}

void PathComposer::update(ComponentDirt value)
{
	if (hasDirt(value, ComponentDirt::Path))
	{
		auto space = m_Shape->pathSpace();
		if ((space & PathSpace::Local) == PathSpace::Local)
		{
			if (m_LocalPath == nullptr)
			{
				m_LocalPath = m_Shape->makeCommandPath(PathSpace::Local);
			}
			else
			{
				m_LocalPath->reset();
			}
			auto world = m_Shape->worldTransform();
			Mat2D inverseWorld;
			if (!Mat2D::invert(inverseWorld, world))
			{
				Mat2D::identity(inverseWorld);
			}
			// Get all the paths into local shape space.
			for (auto path : m_Shape->paths())
			{
				Mat2D localTransform;
				const Mat2D& transform = path->pathTransform();
				Mat2D::multiply(localTransform, inverseWorld, transform);
				m_LocalPath->addPath(path->commandPath(), localTransform);
			}
		}
		if ((space & PathSpace::World) == PathSpace::World)
		{
			if (m_WorldPath == nullptr)
			{
				m_WorldPath = m_Shape->makeCommandPath(PathSpace::World);
			}
			else
			{
				m_WorldPath->reset();
			}
			for (auto path : m_Shape->paths())
			{
				const Mat2D& transform = path->pathTransform();
				m_WorldPath->addPath(path->commandPath(), transform);
			}
		}
	}
}