rhi_image_item_renderer.h

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#pragma once
 
#include <QQuickRhiItemRenderer>
#include <rhi/qrhi.h>
#include <QMutex>
#include <QPointF>
#include <QSize>
#include <vector>
#include <memory>
 
namespace CaptureMoment::Core::Common {
struct ImageRegion;
}
 
namespace CaptureMoment::UI::Rendering {
 
// Forward declaration
class RHIImageItem;
 
class RHIImageItemRenderer : public QQuickRhiItemRenderer {
public:
    // =========================================================================
    // Constructor & Destructor
    // =========================================================================
 
    explicit RHIImageItemRenderer(RHIImageItem* item);
 
    ~RHIImageItemRenderer() override;
 
    // Deleted copy and move operations (GPU resources are non-copyable)
    RHIImageItemRenderer(const RHIImageItemRenderer&) = delete;
    RHIImageItemRenderer& operator=(const RHIImageItemRenderer&) = delete;
    RHIImageItemRenderer(RHIImageItemRenderer&&) = delete;
    RHIImageItemRenderer& operator=(RHIImageItemRenderer&&) = delete;
 
    // =========================================================================
    // QQuickRhiItemRenderer Interface
    // =========================================================================
 
    void initialize(QRhiCommandBuffer* cb) override;
 
    void synchronize(QQuickRhiItem* item) override;
 
    void render(QRhiCommandBuffer* cb) override;
 
private:
    // =========================================================================
    // Private Helper Methods
    // =========================================================================
 
    void createGeometry(QRhiCommandBuffer* cb);
 
    void createPipeline();
 
    void updateTextureFromImage(const Core::Common::ImageRegion& image);
 
    // =========================================================================
    // Member Variables
    // =========================================================================
 
    RHIImageItem* m_item{nullptr};
 
    // -------------------------------------------------------------------------
    // RHI Resources (GPU)
    // -------------------------------------------------------------------------
 
    std::unique_ptr<QRhiTexture> m_texture;
 
    std::unique_ptr<QRhiSampler> m_sampler;
 
    std::unique_ptr<QRhiBuffer> m_vertex_buffer;
 
    std::unique_ptr<QRhiBuffer> m_index_buffer;
 
    std::unique_ptr<QRhiBuffer> m_uniform_buffer;
 
    std::unique_ptr<QRhiShaderResourceBindings> m_srb;
 
    std::unique_ptr<QRhiGraphicsPipeline> m_pipeline;
 
    // -------------------------------------------------------------------------
    // Render State (Thread-Local Copy)
    // -------------------------------------------------------------------------
 
    int m_image_width{0};
 
    int m_image_height{0};
 
    float m_zoom{1.0f};
 
    QPointF m_pan{0, 0};
 
    // -------------------------------------------------------------------------
    // Pixel Data (CPU Staging)
    // -------------------------------------------------------------------------
 
    std::vector<uint8_t> m_pixel_data;
 
    QSize m_pixel_data_size;
 
    bool m_texture_needs_update{false};
 
    bool m_initialized{false};
 
    // -------------------------------------------------------------------------
    // Size Viewport QML
    // -------------------------------------------------------------------------
 
    float m_item_width { 0.0f };
 
    float m_item_height { 0.0f };
};
 
} // namespace CaptureMoment::UI::Rendering