GrExternalTextureGenerator.h

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/*
 * Copyright 2023 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef GrExternalTextureGenerator_DEFINED
#define GrExternalTextureGenerator_DEFINED
 
#include "include/core/SkRefCnt.h"
#include "include/gpu/GrBackendSurface.h"
#include "include/private/base/SkAPI.h"
#include "include/private/gpu/ganesh/GrTextureGenerator.h"
 
#include <memory>
 
class GrRecordingContext;
class GrSurfaceProxyView;
class SkImage;
enum class GrImageTexGenPolicy : int;
namespace skgpu { enum class Mipmapped : bool; }
struct SkImageInfo;
 
class GrExternalTexture {
public:
    virtual ~GrExternalTexture() = default;
    virtual GrBackendTexture getBackendTexture() = 0;
    virtual void dispose() = 0;
};
 
class SK_API GrExternalTextureGenerator : public GrTextureGenerator {
public:
    GrExternalTextureGenerator(const SkImageInfo& info);
 
    GrSurfaceProxyView onGenerateTexture(GrRecordingContext*,
                                         const SkImageInfo&,
                                         skgpu::Mipmapped,
                                         GrImageTexGenPolicy) override;
    virtual std::unique_ptr<GrExternalTexture> generateExternalTexture(GrRecordingContext *,
                                                                       skgpu::Mipmapped) = 0;
};
 
namespace SkImages {
/**
 *   Like SkImages::DeferredFromGenerator except allows for the use of GrTextureGenerator.
 *
 *   @param gen producer of textures
 *   @return    created SkImage, or nullptr
 */
SK_API sk_sp<SkImage> DeferredFromTextureGenerator(std::unique_ptr<GrTextureGenerator> gen);
}
 
#endif  // GrExternalTextureGenerator_DEFINED