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cwebp: add -resize_mode

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* `down_only`: downsample only if one of the input dimensions is larger
               than the target
* `up_only`: upsample only if one of the input dimensions is smaller
             than the target
* `always`: the original behavior

This change doesn't add related modes like area (@ in ImageMagick) or
minimum width/height (^ in ImageMagick). These can be added if a need
arises.

Bug: webp:405437935
Change-Id: I7752789dce6e3b9c3fb7d6edf63ca5559bb3463c
This commit is contained in:
James Zern
2025-04-10 13:05:30 -07:00
parent ad52d5fc7e
commit eb4f813761
3 changed files with 57 additions and 1 deletions
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doc/tools.md
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@ -65,6 +65,7 @@ Options:
(default: 0 100)
-crop <x> <y> <w> <h> .. crop picture with the given rectangle
-resize <w> <h> ........ resize picture (*after* any cropping)
-resize_mode <string> .. one of: up_only, down_only, always (default)
-mt .................... use multi-threading if available
-low_memory ............ reduce memory usage (slower encoding)
-map <int> ............. print map of extra info