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encode.h: 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.

BUG=webp:424

Change-Id: I179c34649834aeadc1606d0856f33e8255048ea1
This commit is contained in:
James Zern 2019-03-15 18:07:11 -07:00 committed by Pascal Massimino
parent fcfd9c71b4
commit 6d2e11ec8b
1 changed files with 4 additions and 0 deletions
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src/webp/encode.h
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@ -62,6 +62,10 @@ WEBP_EXTERN size_t WebPEncodeBGRA(const uint8_t* bgra,
// These functions are the equivalent of the above, but compressing in a // These functions are the equivalent of the above, but compressing in a
// lossless manner. Files are usually larger than lossy format, but will // lossless manner. Files are usually larger than lossy format, but will
// not suffer any compression loss. // 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.
WEBP_EXTERN size_t WebPEncodeLosslessRGB(const uint8_t* rgb, WEBP_EXTERN size_t WebPEncodeLosslessRGB(const uint8_t* rgb,
int width, int height, int stride, int width, int height, int stride,
uint8_t** output); uint8_t** output);