TexturePreview.hpp

#pragma once
#include <ossia/gfx/port_index.hpp>
 
#include <QImage>
#include <QPointer>
#include <QRectF>
#include <QSize>
 
#include <score_plugin_gfx_export.h>
 
#include <cstdint>
#include <memory>
 
struct QRhiReadbackResult;
 
namespace Gfx
{
class GfxContext;
using port_index = ossia::gfx::port_index;
 
class SCORE_PLUGIN_GFX_EXPORT TexturePreview
{
public:
  TexturePreview();
  ~TexturePreview();
  TexturePreview(const TexturePreview&) = delete;
  TexturePreview& operator=(const TexturePreview&) = delete;
 
  void attach(GfxContext* ctx, port_index producer, QSize size);
  void setProducer(port_index producer);
  void setSize(QSize size);
  void detach();
 
  bool attached() const noexcept;
  port_index producer() const noexcept { return m_producer; }
  bool tapped() const noexcept;
  bool onHub() const noexcept;
 
  QImage image() const;
 
  static QRectF fit(const QRectF& box, QSize size) noexcept
  {
    if(size.isEmpty())
      return box;
    const QSizeF s = QSizeF(size).scaled(box.size(), Qt::KeepAspectRatio);
    return {box.center().x() - s.width() / 2., box.center().y() - s.height() / 2., s.width(), s.height()};
  }
 
private:
  QPointer<GfxContext> m_ctx;
  port_index m_producer{-1, -1};
  int32_t m_id{-1};
  std::shared_ptr<QRhiReadbackResult> m_readback;
};
}