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mark VP8{,L}{GetInfo,CheckSignature} as WEBP_EXTERN

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these functions are used by libwebpmux

Change-Id: Ifcb79e685f3a6b53007c0dc5f220737daba97d47
This commit is contained in:
James Zern
2012-04-24 18:04:38 -07:00
parent b9ae4f0d88
commit 228d96a538
4 changed files with 24 additions and 21 deletions
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23
src/webp/decode_vp8.h
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@ -151,6 +151,29 @@ WEBP_EXTERN(void) VP8Clear(VP8Decoder* const dec);
WEBP_EXTERN(void) VP8Delete(VP8Decoder* const dec);
//------------------------------------------------------------------------------
// Miscellaneous VP8/VP8L bitstream probing functions.
// Returns true if the next 3 bytes in data contain the VP8 signature.
WEBP_EXTERN(int) VP8CheckSignature(const uint8_t* const data, size_t data_size);
// Validates the VP8 data-header and retrieves basic header information viz
// width and height. Returns 0 in case of formatting error. *width/*height
// can be passed NULL.
WEBP_EXTERN(int) VP8GetInfo(
const uint8_t* data,
size_t data_size, // data available so far
size_t chunk_size, // total data size expected in the chunk
int* const width, int* const height);
// Returns true if the next byte(s) in data is a VP8L signature.
WEBP_EXTERN(int) VP8LCheckSignature(const uint8_t* const data, size_t size);
// Validates the VP8L data-header and retrieves basic header information viz
// width, height and alpha. Returns 0 in case of formatting error.
// width/height/has_alpha can be passed NULL.
WEBP_EXTERN(int) VP8LGetInfo(
const uint8_t* data, size_t data_size, // data available so far
int* const width, int* const height, int* const has_alpha);
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"