Viewport.h

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#pragma once
 
#include "Math/TVector2.h"
#include "Math/Geometry/TAABB2D.h"
 
#include <Common/assertion.h>
 
#include <utility>
#include <cstddef>
#include <string>
 
namespace ph
{
 
class Viewport final
{
public:
    Viewport();
 
    explicit Viewport(math::TVector2<uint32> baseSizePx);
    Viewport(math::TVector2<uint32> baseSizePx, math::TAABB2D<int64> windowPx);
 
    const math::TVector2<uint32>& getBaseSizePx() const;
 
    const math::TAABB2D<int64>& getWindowPx() const;
 
    math::TAABB2D<int64> getCroppedRegionPx() const;
 
    std::size_t numBasePixels() const;
    std::size_t numCroppedRegionPixels() const;
 
    bool hasView() const;
 
    std::string toString() const;
 
private:
    math::TVector2<uint32> m_baseSizePx;
    math::TAABB2D<int64>   m_windowPx;
};
 
// In-header Implementations:
 
inline Viewport::Viewport() :
    Viewport({0, 0})
{}
 
inline Viewport::Viewport(math::TVector2<uint32> baseSizePx) :
    Viewport(std::move(baseSizePx), math::TAABB2D<int64>({0, 0}, {baseSizePx.x(), baseSizePx.y() }))
{}
 
inline Viewport::Viewport(math::TVector2<uint32> baseSizePx, math::TAABB2D<int64> windowPx) :
    m_baseSizePx(std::move(baseSizePx)),
    m_windowPx  (std::move(windowPx))
{
    PH_ASSERT(!m_windowPx.isEmpty());
}
 
inline const math::TVector2<uint32>& Viewport::getBaseSizePx() const
{
    return m_baseSizePx;
}
 
inline const math::TAABB2D<int64>& Viewport::getWindowPx() const
{
    return m_windowPx;
}
 
inline math::TAABB2D<int64> Viewport::getCroppedRegionPx() const
{
    math::TAABB2D<int64> intersectedWindowPx({0, 0}, {m_baseSizePx.x(), m_baseSizePx.y()});
    intersectedWindowPx.intersectWith(m_windowPx);
    return intersectedWindowPx;
}
 
inline std::size_t Viewport::numBasePixels() const
{
    return static_cast<std::size_t>(m_baseSizePx.x()) * m_baseSizePx.y();
}
 
inline std::size_t Viewport::numCroppedRegionPixels() const
{
    return static_cast<std::size_t>(getCroppedRegionPx().getArea());
}
 
inline bool Viewport::hasView() const
{
    return getCroppedRegionPx().getArea() > 0;
}
 
inline std::string Viewport::toString() const
{
    return "viewport base: " + m_baseSizePx.toString() + ", window: " + m_windowPx.toString();
}
 
}// end namespace ph