Update bundled libwebp to version 1.0.3

[ChangeLog][Third-Party Code] Update bundled libwebp to version 1.0.3

Change-Id: I7aef89e209923af0e516024c26ebce4a8158d4d1
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
Reviewed-by: Liang Qi <liang.qi@qt.io>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/3rdparty/libwebp/src/webp/encode.h b/src/3rdparty/libwebp/src/webp/encode.h
index 549cf07..339f881 100644
--- a/src/3rdparty/libwebp/src/webp/encode.h
+++ b/src/3rdparty/libwebp/src/webp/encode.h
@@ -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
 // 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.
 WEBP_EXTERN size_t WebPEncodeLosslessRGB(const uint8_t* rgb,
                                          int width, int height, int stride,
                                          uint8_t** output);