RenderToBuffer.h

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// The MIT License (MIT)
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#pragma once

#include <cstdint>
#include <functional>
#include <memory>

namespace open3d {
namespace visualization {

class Scene;
class View;

class RenderToBuffer {
public:
    struct Buffer {
        std::size_t width = 0;
        std::size_t height = 0;
        const std::uint8_t* bytes = nullptr;
        std::size_t size = 0;
    };

    using BufferReadyCallback = std::function<void(const Buffer&)>;

    virtual ~RenderToBuffer() = default;

    virtual void SetDimensions(std::size_t width, std::size_t height) = 0;
    virtual void CopySettings(const View* view) = 0;
    virtual View& GetView() = 0;
    // BufferReadyCallback does not need to free Buffer::bytes.
    // It should also not cache the pointer.
    virtual void RequestFrame(Scene* scene, BufferReadyCallback cb) = 0;
};

}  // namespace visualization
}  // namespace open3d