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src/Source/LibWebP/src/enc/vp8enci.h  view on Meta::CPAN

  VP8MBInfo* mb_info_;   // contextual macroblock infos (mb_w_ + 1)
  uint8_t*   preds_;     // predictions modes: (4*mb_w+1) * (4*mb_h+1)
  uint32_t*  nz_;        // non-zero bit context: mb_w+1
  uint8_t*   y_top_;     // top luma samples.
  uint8_t*   uv_top_;    // top u/v samples.
                         // U and V are packed into 16 bytes (8 U + 8 V)
  LFStats*   lf_stats_;  // autofilter stats (if NULL, autofilter is off)
};

//------------------------------------------------------------------------------
// internal functions. Not public.

  // in tree.c
extern const uint8_t VP8CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS];
extern const uint8_t
    VP8CoeffsUpdateProba[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS];
// Reset the token probabilities to their initial (default) values
void VP8DefaultProbas(VP8Encoder* const enc);
// Write the token probabilities
void VP8WriteProbas(VP8BitWriter* const bw, const VP8Proba* const probas);
// Writes the partition #0 modes (that is: all intra modes)
void VP8CodeIntraModes(VP8Encoder* const enc);

  // in syntax.c
// Generates the final bitstream by coding the partition0 and headers,
// and appending an assembly of all the pre-coded token partitions.
// Return true if everything is ok.
int VP8EncWrite(VP8Encoder* const enc);
// Release memory allocated for bit-writing in VP8EncLoop & seq.
void VP8EncFreeBitWriters(VP8Encoder* const enc);

  // in frame.c
extern const uint8_t VP8Cat3[];
extern const uint8_t VP8Cat4[];
extern const uint8_t VP8Cat5[];
extern const uint8_t VP8Cat6[];

// Form all the four Intra16x16 predictions in the yuv_p_ cache
void VP8MakeLuma16Preds(const VP8EncIterator* const it);
// Form all the four Chroma8x8 predictions in the yuv_p_ cache
void VP8MakeChroma8Preds(const VP8EncIterator* const it);
// Form all the ten Intra4x4 predictions in the yuv_p_ cache
// for the 4x4 block it->i4_
void VP8MakeIntra4Preds(const VP8EncIterator* const it);
// Rate calculation
int VP8GetCostLuma16(VP8EncIterator* const it, const VP8ModeScore* const rd);
int VP8GetCostLuma4(VP8EncIterator* const it, const int16_t levels[16]);
int VP8GetCostUV(VP8EncIterator* const it, const VP8ModeScore* const rd);
// Main coding calls
int VP8EncLoop(VP8Encoder* const enc);
int VP8EncTokenLoop(VP8Encoder* const enc);

  // in webpenc.c
// Assign an error code to a picture. Return false for convenience.
int WebPEncodingSetError(const WebPPicture* const pic, WebPEncodingError error);
int WebPReportProgress(const WebPPicture* const pic,
                       int percent, int* const percent_store);

  // in analysis.c
// Main analysis loop. Decides the segmentations and complexity.
// Assigns a first guess for Intra16 and uvmode_ prediction modes.
int VP8EncAnalyze(VP8Encoder* const enc);

  // in quant.c
// Sets up segment's quantization values, base_quant_ and filter strengths.
void VP8SetSegmentParams(VP8Encoder* const enc, float quality);
// Pick best modes and fills the levels. Returns true if skipped.
int VP8Decimate(VP8EncIterator* const it, VP8ModeScore* const rd,
                VP8RDLevel rd_opt);

  // in alpha.c
void VP8EncInitAlpha(VP8Encoder* const enc);    // initialize alpha compression
int VP8EncStartAlpha(VP8Encoder* const enc);    // start alpha coding process
int VP8EncFinishAlpha(VP8Encoder* const enc);   // finalize compressed data
int VP8EncDeleteAlpha(VP8Encoder* const enc);   // delete compressed data

  // in filter.c

// SSIM utils
typedef struct {
  double w, xm, ym, xxm, xym, yym;
} DistoStats;
void VP8SSIMAddStats(const DistoStats* const src, DistoStats* const dst);
void VP8SSIMAccumulatePlane(const uint8_t* src1, int stride1,
                            const uint8_t* src2, int stride2,
                            int W, int H, DistoStats* const stats);
double VP8SSIMGet(const DistoStats* const stats);
double VP8SSIMGetSquaredError(const DistoStats* const stats);

// autofilter
void VP8InitFilter(VP8EncIterator* const it);
void VP8StoreFilterStats(VP8EncIterator* const it);
void VP8AdjustFilterStrength(VP8EncIterator* const it);

// returns the approximate filtering strength needed to smooth a edge
// step of 'delta', given a sharpness parameter 'sharpness'.
int VP8FilterStrengthFromDelta(int sharpness, int delta);

  // misc utils for picture_*.c:

// Remove reference to the ARGB/YUVA buffer (doesn't free anything).
void WebPPictureResetBuffers(WebPPicture* const picture);

// Allocates ARGB buffer of given dimension (previous one is always free'd).
// Preserves the YUV(A) buffer. Returns false in case of error (invalid param,
// out-of-memory).
int WebPPictureAllocARGB(WebPPicture* const picture, int width, int height);

// Allocates YUVA buffer of given dimension (previous one is always free'd).
// Uses picture->csp to determine whether an alpha buffer is needed.
// Preserves the ARGB buffer.
// Returns false in case of error (invalid param, out-of-memory).
int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height);

  // in near_lossless.c
// Near lossless preprocessing in RGB color-space.
int VP8ApplyNearLossless(int xsize, int ysize, uint32_t* argb, int quality);
// Near lossless adjustment for predictors.
void VP8ApplyNearLosslessPredict(int xsize, int ysize, int pred_bits,
                                 const uint32_t* argb_orig,
                                 uint32_t* argb, uint32_t* argb_scratch,