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Alpha coding: reorganize the filter/unfiltering code

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Move the filtering code to their own dsp/ spot
New function: VP8FiltersInit()

Change-Id: I0b2041eab42346c59b972f2575b05509e6a8f7b1
This commit is contained in:
Pascal Massimino
2015-01-28 08:02:41 +01:00
parent ec0d1be577
commit 7afdaf8496
12 changed files with 291 additions and 233 deletions
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33
src/dsp/dsp.h
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@ -373,6 +373,39 @@ extern void (*VP8PackRGB)(const uint8_t* r, const uint8_t* g, const uint8_t* b,
// To be called first before using the above.
WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspARGBInit(void);
//------------------------------------------------------------------------------
// Filter functions
typedef enum { // Filter types.
WEBP_FILTER_NONE = 0,
WEBP_FILTER_HORIZONTAL,
WEBP_FILTER_VERTICAL,
WEBP_FILTER_GRADIENT,
WEBP_FILTER_LAST = WEBP_FILTER_GRADIENT + 1, // end marker
WEBP_FILTER_BEST, // meta-types
WEBP_FILTER_FAST
} WEBP_FILTER_TYPE;
typedef void (*WebPFilterFunc)(const uint8_t* in, int width, int height,
int stride, uint8_t* out);
typedef void (*WebPUnfilterFunc)(int width, int height, int stride,
int row, int num_rows, uint8_t* data);
// Filter the given data using the given predictor.
// 'in' corresponds to a 2-dimensional pixel array of size (stride * height)
// in raster order.
// 'stride' is number of bytes per scan line (with possible padding).
// 'out' should be pre-allocated.
extern WebPFilterFunc WebPFilters[WEBP_FILTER_LAST];
// In-place reconstruct the original data from the given filtered data.
// The reconstruction will be done for 'num_rows' rows starting from 'row'
// (assuming rows upto 'row - 1' are already reconstructed).
extern WebPUnfilterFunc WebPUnfilters[WEBP_FILTER_LAST];
// To be called first before using the above.
WEBP_TSAN_IGNORE_FUNCTION void VP8FiltersInit(void);
#ifdef __cplusplus
} // extern "C"
#endif