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enable dc error-diffusion always

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for q<=98, we always enable error diffusion.

+ reduce storage 2x by using int8_t
+ make the error diffusion more robust

BUG=webp:340,308

Change-Id: I0608df839ff7b64d6843005a0f81d2577143af9e
This commit is contained in:
Pascal Massimino
2017-12-22 08:01:48 -08:00
parent c2d04f3eb2
commit 815652de03
2 changed files with 29 additions and 24 deletions
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6
src/enc/vp8i_enc.h
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@ -121,7 +121,7 @@ static WEBP_INLINE int QUANTDIV(uint32_t n, uint32_t iQ, uint32_t B) {
// #define DISABLE_TOKEN_BUFFER
// quality below which error-diffusion is enabled
#define ERROR_DIFFUSION_QUALITY 30
#define ERROR_DIFFUSION_QUALITY 98
//------------------------------------------------------------------------------
// Headers
@ -204,7 +204,7 @@ typedef struct {
score_t i4_penalty_; // penalty for using Intra4
} VP8SegmentInfo;
typedef int16_t DError[2 /* u/v */][2 /* top or left */];
typedef int8_t DError[2 /* u/v */][2 /* top or left */];
// Handy transient struct to accumulate score and info during RD-optimization
// and mode evaluation.
@ -218,7 +218,7 @@ typedef struct {
uint8_t modes_i4[16]; // mode numbers for intra4 predictions
int mode_uv; // mode number of chroma prediction
uint32_t nz; // non-zero blocks
int16_t derr[2][3]; // DC diffusion errors for U/V for blocks #1/2/3
int8_t derr[2][3]; // DC diffusion errors for U/V for blocks #1/2/3
} VP8ModeScore;
// Iterator structure to iterate through macroblocks, pointing to the