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alpha: preparatory cleanup

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* make ALPHNew/Delete static
* properly init ALPHDec::io_
* introduce AllocateAlphaPlane() and WebPDeallocateAlphaMemory()
* reorganize VP8DecompressAlphaRows()

but we're still allocate the full alpha-plane. Optim will come
in another patch since it's tricky

Change-Id: Ib6f190a40abb7926a71535b0ed67c39d0974e06a
This commit is contained in:
Pascal Massimino
2016-04-04 15:50:57 +02:00
parent b95ac0a221
commit cf6c713a0b
4 changed files with 74 additions and 37 deletions
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7
src/dec/vp8i.h
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@ -258,9 +258,10 @@ struct VP8Decoder {
struct ALPHDecoder* alph_dec_; // alpha-plane decoder object
const uint8_t* alpha_data_; // compressed alpha data (if present)
size_t alpha_data_size_;
int is_alpha_decoded_; // true if alpha_data_ is decoded in alpha_plane_
uint8_t* alpha_plane_; // output. Persistent, contains the whole data.
int alpha_dithering_; // derived from decoding options (0=off, 100=full).
int is_alpha_decoded_; // true if alpha_data_ is decoded in alpha_plane_
uint8_t* alpha_plane_mem_; // memory allocated for alpha_plane_
uint8_t* alpha_plane_; // output. Persistent, contains the whole data.
int alpha_dithering_; // derived from decoding options (0=off, 100=full)
};
//------------------------------------------------------------------------------