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WebPPicture: clarify the ownership of user-owned data.

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It's explicitly safe (and recommended!) to plug external data into
the pic->y/u/v/argb fields. They are guaranteed to be preserved
by the encoding process if no conversion is needed.

Change-Id: I325ca41a6a834f7f028431c605dddef67e9542cc
This commit is contained in:
Pascal Massimino 2020-12-14 12:25:21 +01:00 committed by Skal
parent cccf5e337a
commit 2e7bed7925
1 changed files with 5 additions and 0 deletions
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5
src/webp/encode.h
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@ -292,6 +292,11 @@ typedef enum WebPEncodingError {
#define WEBP_MAX_DIMENSION 16383 #define WEBP_MAX_DIMENSION 16383
// Main exchange structure (input samples, output bytes, statistics) // Main exchange structure (input samples, output bytes, statistics)
//
// Once WebPPictureInit() has been called, it's ok to make all the INPUT fields
// (use_argb, y/u/v, argb, ...) point to user-owned data, even if
// WebPPictureAlloc() has been called. Depending on the value use_argb,
// it's guaranteed that either *argb or *y/*u/*v content will be kept untouched.
struct WebPPicture { struct WebPPicture {
// INPUT // INPUT
////////////// //////////////