OffscreenPreview.h

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#pragma once
#include "common/Export.h"
 
 
#include "editing/EditingProtocol.h"
 
#include <array>
#include <functional>
#include <memory>
#include <string>
#include <vector>
 
namespace eve::graphics {
class Graphics;
class Canvas;
class ICanvasFactory;
class ICanvasTarget;
}
namespace eve::image {
class ImageData;
}
 
namespace eve::graphics_editing {
using EditorStatus=editing::Status; using StableId=editing::StableId;
using Revision=editing::Revision; using RuleId=editing::RuleId;
using editing::Result;
 
struct OffscreenPreviewRequest {
    StableId previewId;
    Revision sourceRevision = 0;
    int width = 0;
    int height = 0;
    std::array<double, 4> clearColor{0.08, 0.08, 0.10, 1.0};
};
 
struct OffscreenPreviewArtifact {
    std::string handle;
    StableId previewId;
    Revision sourceRevision = 0;
    int width = 0;
    int height = 0;
};
 
class EVENGINE_API_WORLD GraphicsOffscreenPreviewService {
public:
    using DrawCallback = std::function<Result<void>(graphics::Graphics*, graphics::Canvas*)>;
    GraphicsOffscreenPreviewService(graphics::Graphics* graphics,
                                    graphics::ICanvasFactory* canvases,
                                    graphics::ICanvasTarget* targets);
    ~GraphicsOffscreenPreviewService();
    GraphicsOffscreenPreviewService(const GraphicsOffscreenPreviewService&) = delete;
    GraphicsOffscreenPreviewService& operator=(const GraphicsOffscreenPreviewService&) = delete;
    Result<OffscreenPreviewArtifact> render(const OffscreenPreviewRequest& request,
                                                  const DrawCallback& draw,
                                                  int maximumDimension = 4096,
                                                  std::uint64_t maximumPixels = 16777216);
    Result<const image::ImageData*> image(const std::string& handle,
                                                Revision currentRevision) const;
    Result<void> release(const std::string& handle);
 
private:
    struct Impl;
    std::unique_ptr<Impl> impl_;
};
 
}  // namespace eve::graphics_editing