fix ALFA alpha channel row padding for odd-width JPEG bitmaps#78
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fix ALFA alpha channel row padding for odd-width JPEG bitmaps#78
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Director stores ALFA chunk rows padded to 2-byte boundaries. The RLE decompressor was treating the data as flat pixels, causing a cumulative 1-byte-per-row diagonal shear on odd-width bitmaps (e.g. 505px wide). Extract shared decompress_alpha_rle() helper used by both decode_jpeg_bitmap (ALFA chunk) and decode_jpeg_bitd (inline alpha), replacing two duplicate inline RLE loops. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
matthewdean
changed the title
igorlira
approved these changes
Mar 20, 2026
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Summary
decompress_alpha_rle()helper used by bothdecode_jpeg_bitmap(ALFA chunk) anddecode_jpeg_bitd(inline alpha), replacing two duplicate inline RLE loops.Test plan
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