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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/alphai.h
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@ -40,11 +40,8 @@ struct ALPHDecoder {
//------------------------------------------------------------------------------
// internal functions. Not public.
// Allocates a new alpha decoder instance.
ALPHDecoder* ALPHNew(void);
// Clears and deallocates an alpha decoder instance.
void ALPHDelete(ALPHDecoder* const dec);
// Deallocate memory associated to dec->alpha_plane_ decoding
void WebPDeallocateAlphaMemory(VP8Decoder* const dec);
//------------------------------------------------------------------------------