/*

 * Copyright 2021 Google LLC

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#ifndef skgpu_graphite_TextureInfo_DEFINED

#define skgpu_graphite_TextureInfo_DEFINED

#include "include/core/SkString.h"

#include "include/core/SkTextureCompressionType.h"

#include "include/gpu/graphite/GraphiteTypes.h"

#include "include/private/base/SkAPI.h"

#include "include/private/base/SkAnySubclass.h"

struct SkISize;

namespace skgpu::graphite {

class TextureInfoData;

class SK_API TextureInfo {

public:

    TextureInfo();

    ~TextureInfo();

    TextureInfo(const TextureInfo&);

    TextureInfo& operator=(const TextureInfo&);

    bool operator==(const TextureInfo&) const;

    bool operator!=(const TextureInfo& that) const { return !(*this == that); }

    bool isValid() const { return fValid; }

    BackendApi backend() const { return fBackend; }

    uint32_t numSamples() const { return fSampleCount; }

    Mipmapped mipmapped() const { return fMipmapped; }

    Protected isProtected() const { return fProtected; }

    SkTextureCompressionType compressionType() const;

    bool isMemoryless() const;

    bool isCompatible(const TextureInfo& that) const;

    // Return a string containing the full description of this TextureInfo.

    SkString toString() const;

    // Return a string containing only the info relevant for its use as a RenderPass attachment.

    SkString toRPAttachmentString() const;

private:

    friend class TextureInfoData;

    friend class TextureInfoPriv;

    // Size determined by looking at the TextureInfoData subclasses, then guessing-and-checking.

    // Compiler will complain if this is too small - in that case, just increase the number.

    inline constexpr static size_t kMaxSubclassSize = 112;

    using AnyTextureInfoData = SkAnySubclass<TextureInfoData, kMaxSubclassSize>;

    template <typename SomeTextureInfoData>

    TextureInfo(BackendApi backend,

                uint32_t sampleCount,

                skgpu::Mipmapped mipped,

                skgpu::Protected isProtected,

                const SomeTextureInfoData& textureInfoData)

            : fBackend(backend)

            , fValid(true)

            , fSampleCount(sampleCount)

            , fMipmapped(mipped)

            , fProtected(isProtected) {

        fTextureInfoData.emplace<SomeTextureInfoData>(textureInfoData);

    }

    friend size_t ComputeSize(SkISize dimensions, const TextureInfo&);  // for bytesPerPixel

    size_t bytesPerPixel() const;

    BackendApi fBackend = BackendApi::kMock;

    bool fValid = false;

    uint32_t fSampleCount = 1;

    Mipmapped fMipmapped = Mipmapped::kNo;

    Protected fProtected = Protected::kNo;

    AnyTextureInfoData fTextureInfoData;

};

}  // namespace skgpu::graphite

#endif  //skgpu_graphite_TextureInfo_DEFINED