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Add dt_exif_write_blob_to_buffer(), for in-memory exif handling#21342

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Add dt_exif_write_blob_to_buffer(), for in-memory exif handling#21342
dholth wants to merge 1 commit into
darktable-org:masterfrom
dholth:exif-write-blob-to-buffer

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@dholth

@dholth dholth commented Jun 18, 2026

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Some formats like jpeg-xl expect exif data to be added to the beginning of the file at encode time, and are not as readily manipulated afterwards by Exiv2 compared to jpeg. Add a way to filter image data in memory before passing blob to image format encoder.

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