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api.md: mention 'exact' default in WebPEncodeLossless*

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Note that config.exact defaults to 0 and point users to WebPEncode() if
the default isn't acceptable. This duplicates the comment from encode.h
for visibility. Follow up to:
6d2e11ec encode.h: mention 'exact' default in WebPEncodeLossless*

Bug: 449296530
Change-Id: Iba44dbcbb179bd80ea0a6b9e129b2c7e0a406916
This commit is contained in:
James Zern
2025-10-06 13:49:20 -07:00
parent 1f0a494e80
commit 64dce5d826
2 changed files with 10 additions and 3 deletions
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7
src/webp/encode.h
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@@ -65,9 +65,10 @@ WEBP_EXTERN size_t WebPEncodeBGRA(const uint8_t* bgra, int width, int height,
// lossless manner. Files are usually larger than lossy format, but will
// not suffer any compression loss.
// Note these functions, like the lossy versions, use the library's default
// settings. For lossless this means 'exact' is disabled. RGB values in
// transparent areas will be modified to improve compression. To avoid this,
// use WebPEncode() and set WebPConfig::exact to 1.
// settings. For lossless this means 'exact' is disabled. RGB values in fully
// transparent areas (that is, areas with alpha values equal to 0) will be
// modified to improve compression. To avoid this, use WebPEncode() and set
// WebPConfig::exact to 1.
WEBP_EXTERN size_t WebPEncodeLosslessRGB(const uint8_t* rgb, int width,
int height, int stride,
uint8_t** output);