63 lines
2.3 KiB
C++
63 lines
2.3 KiB
C++
/*
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* Copyright 2023 Google LLC
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkXmp_DEFINED
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#define SkXmp_DEFINED
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#include "include/core/SkRefCnt.h"
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#include "include/private/base/SkAPI.h"
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class SkData;
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struct SkGainmapInfo;
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#include <cstddef>
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#include <memory>
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/*
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* An interface to extract information from XMP metadata.
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*/
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class SK_API SkXmp {
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public:
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SkXmp() = default;
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virtual ~SkXmp() = default;
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// Make noncopyable
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SkXmp(const SkXmp&) = delete;
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SkXmp& operator= (const SkXmp&) = delete;
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// Create from XMP data.
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static std::unique_ptr<SkXmp> Make(sk_sp<SkData> xmpData);
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// Create from standard XMP + extended XMP data, see XMP Specification Part 3: Storage in files,
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// Section 1.1.3.1: Extended XMP in JPEG
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static std::unique_ptr<SkXmp> Make(sk_sp<SkData> xmpStandard, sk_sp<SkData> xmpExtended);
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// Extract HDRGM gainmap parameters.
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// TODO(b/338342146): Remove this once all callers are removed.
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bool getGainmapInfoHDRGM(SkGainmapInfo* info) const { return getGainmapInfoAdobe(info); }
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// Extract gainmap parameters from http://ns.adobe.com/hdr-gain-map/1.0/.
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virtual bool getGainmapInfoAdobe(SkGainmapInfo* info) const = 0;
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// If the image specifies http://ns.apple.com/pixeldatainfo/1.0/ AuxiliaryImageType of
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// urn:com:apple:photo:2020:aux:hdrgainmap, and includes a http://ns.apple.com/HDRGainMap/1.0/
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// HDRGainMapVersion, then populate |info| with gainmap parameters that will approximate the
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// math specified at [0] and return true.
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// [0] https://developer.apple.com/documentation/appkit/images_and_pdf/
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// applying_apple_hdr_effect_to_your_photos
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virtual bool getGainmapInfoApple(float exifHdrHeadroom, SkGainmapInfo* info) const = 0;
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// If this includes GContainer metadata and the GContainer contains an item with semantic
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// GainMap and Mime of image/jpeg, then return true, and populate |offset| and |size| with
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// that item's offset (from the end of the primary JPEG image's EndOfImage), and the size of
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// the gainmap.
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virtual bool getContainerGainmapLocation(size_t* offset, size_t* size) const = 0;
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// Return the GUID of an Extended XMP if present, or null otherwise.
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virtual const char* getExtendedXmpGuid() const = 0;
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};
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#endif
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