include/private/SkXmp.h

/*
 * Copyright 2023 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkXmp_DEFINED
#define SkXmp_DEFINED

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

class SkData;
struct SkGainmapInfo;

#include <cstddef>
#include <memory>

/*
 * An interface to extract information from XMP metadata.
 */
class SK_API SkXmp {
public:
    virtual ~SkXmp() = default;

    // Create from XMP data.
    static std::unique_ptr<SkXmp> Make(sk_sp<SkData> xmpData);
    // Create from standard XMP + extended XMP data, see XMP Specification Part 3: Storage in files,
    // Section 1.1.3.1: Extended XMP in JPEG
    static std::unique_ptr<SkXmp> Make(sk_sp<SkData> xmpStandard, sk_sp<SkData> xmpExtended);

    // Extract HDRGM gainmap parameters.
    virtual bool getGainmapInfoHDRGM(SkGainmapInfo* info) const = 0;

    // Extract HDRGainMap gainmap parameters.
    virtual bool getGainmapInfoHDRGainMap(SkGainmapInfo* info) const = 0;

    // If this includes GContainer metadata and the GContainer contains an item with semantic
    // GainMap and Mime of image/jpeg, then return true, and populate |offset| and |size| with
    // that item's offset (from the end of the primary JPEG image's EndOfImage), and the size of
    // the gainmap.
    virtual bool getContainerGainmapLocation(size_t* offset, size_t* size) const = 0;

    // Return the GUID of an Extended XMP if present, or null otherwise.
    virtual const char* getExtendedXmpGuid() const = 0;
};

#endif