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Introduce a 'fast' alpha mode

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.. where only 2 filtering modes are potentially
tried, instead of all of them. This is fast than the exhaustive 'best'
mode, and not much worse.

Options for cwebp are:
 -alpha_filter none
 -alpha_filter fast      (<- default)
 -alpha_filter best      (<- slow)

Change-Id: I8cb90ee11b8f981811e013ea4ad5bf72ba3ea7d4
This commit is contained in:
Pascal Massimino
2012-01-08 19:27:21 -08:00
parent ad1e163a0d
commit 8ca2076de1
9 changed files with 179 additions and 153 deletions
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12
src/utils/filters.h
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@ -24,9 +24,9 @@ typedef enum {
WEBP_FILTER_HORIZONTAL,
WEBP_FILTER_VERTICAL,
WEBP_FILTER_GRADIENT,
WEBP_FILTER_PAETH,
WEBP_FILTER_LAST = WEBP_FILTER_GRADIENT + 1, // end marker
WEBP_FILTER_BEST,
WEBP_FILTER_LAST,
WEBP_FILTER_FAST
} WEBP_FILTER_TYPE;
typedef void (*WebPFilterFunc)(const uint8_t* in, int width, int height,
@ -38,10 +38,14 @@ typedef void (*WebPFilterFunc)(const uint8_t* in, int width, int height,
// 'bpp' is number of bytes per pixel, and
// 'stride' is number of bytes per scan line (with possible padding).
// 'out' should be pre-allocated.
extern const WebPFilterFunc WebPFilters[/*WEBP_FILTER_LAST*/];
extern const WebPFilterFunc WebPFilters[WEBP_FILTER_LAST];
// Reconstruct the original data from the given filtered data.
extern const WebPFilterFunc WebPUnfilters[/*WEBP_FILTER_LAST*/];
extern const WebPFilterFunc WebPUnfilters[WEBP_FILTER_LAST];
// Fast estimate of a potentially good filter.
extern WEBP_FILTER_TYPE EstimateBestFilter(const uint8_t* data,
int width, int height, int stride);
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"