1 /* 2 * Copyright 2023 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkXmp_DEFINED 9 #define SkXmp_DEFINED 10 11 #include "include/core/SkRefCnt.h" 12 #include "include/private/base/SkAPI.h" 13 14 class SkData; 15 struct SkGainmapInfo; 16 17 #include <cstddef> 18 #include <memory> 19 20 /* 21 * An interface to extract information from XMP metadata. 22 */ 23 class SK_API SkXmp { 24 public: 25 SkXmp() = default; 26 virtual ~SkXmp() = default; 27 // Make noncopyable 28 SkXmp(const SkXmp&) = delete; 29 SkXmp& operator= (const SkXmp&) = delete; 30 31 // Create from XMP data. 32 static std::unique_ptr<SkXmp> Make(sk_sp<SkData> xmpData); 33 // Create from standard XMP + extended XMP data, see XMP Specification Part 3: Storage in files, 34 // Section 1.1.3.1: Extended XMP in JPEG 35 static std::unique_ptr<SkXmp> Make(sk_sp<SkData> xmpStandard, sk_sp<SkData> xmpExtended); 36 37 // Extract HDRGM gainmap parameters. 38 // TODO(b/338342146): Remove this once all callers are removed. getGainmapInfoHDRGM(SkGainmapInfo * info)39 bool getGainmapInfoHDRGM(SkGainmapInfo* info) const { return getGainmapInfoAdobe(info); } 40 41 // Extract gainmap parameters from http://ns.adobe.com/hdr-gain-map/1.0/. 42 virtual bool getGainmapInfoAdobe(SkGainmapInfo* info) const = 0; 43 44 // If the image specifies http://ns.apple.com/pixeldatainfo/1.0/ AuxiliaryImageType of 45 // urn:com:apple:photo:2020:aux:hdrgainmap, and includes a http://ns.apple.com/HDRGainMap/1.0/ 46 // HDRGainMapVersion, then populate |info| with gainmap parameters that will approximate the 47 // math specified at [0] and return true. 48 // [0] https://developer.apple.com/documentation/appkit/images_and_pdf/ 49 // applying_apple_hdr_effect_to_your_photos 50 virtual bool getGainmapInfoApple(float exifHdrHeadroom, SkGainmapInfo* info) const = 0; 51 52 // If this includes GContainer metadata and the GContainer contains an item with semantic 53 // GainMap and Mime of image/jpeg, then return true, and populate |offset| and |size| with 54 // that item's offset (from the end of the primary JPEG image's EndOfImage), and the size of 55 // the gainmap. 56 virtual bool getContainerGainmapLocation(size_t* offset, size_t* size) const = 0; 57 58 // Return the GUID of an Extended XMP if present, or null otherwise. 59 virtual const char* getExtendedXmpGuid() const = 0; 60 }; 61 62 #endif 63