Add optional image rank/color load/save from/to xmp sidecar
Add optional ability to load/save image rank property from/to xmp sidecar "xmp.Rating" and color property from xmp "xmp.Label" ignoring the ones provided in the processing params file. This behavior is disabled by default and an option under settings -> file browser has been added to enable it. When enabled: * On load: * rank and color are not read from processing params. * rank is mapped from xmp sidecar file rating entry. * color is mapped from xmp sidecar file label entry. * On save: * rank and color are saved to the xmp sidecar * rank and color are also saved to the processing param (pp3) files to keep them in sync Rating mapping: Since rating can be also -1 but rank only goes from 0 to 5, the -1 value is ignored like already done when importing from embedded xmp data. Color mapping: XMP has no color concept, usually programs like digikam uses the label field to write a color name ("Red", "Orange"). The problem is that this isn't standardized and label can be any string. Additionally Rawtherapee has 5 specific colors while other programs can have different colors with different name so they won't be shown if they don't map to the 5 color names supported by rawtherapee. On save only the 5 color supported by rawtherapee wil be saved. Trash is kept only in the profile files for multiple reasons: * There's no trash concept in xmp, there's the rejected concept assigned to a rating == -1. * We could map rejected to trash but in rawtherapee rank and trash are two different values and an image can have both rank >= 0 and trashed set to true. Using an unique value like rating for rank and trash (when -1) will require changing the current rawtherapee logic. * Also digikam only handles ratings from 0 to 5 (no -1) and handles trash in its own internal way without reflecting it in the xmp sidecar.
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@@ -116,6 +116,7 @@ class Thumbnail
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void saveMetadata();
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void loadProperties();
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void updateProcParamsProperties();
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void saveXMPSidecarProperties();
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public:
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Thumbnail (CacheManager* cm, const Glib::ustring& fname, CacheImageData* cf);
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