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add WebPDispatchAlphaToGreen() to dsp

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SSE2 version is 2.1x faster

This is used to transfer the alpha plane to green channel before lossless compression.

Change-Id: I01d9df0051c183b1ff5d6eb69961d4f43e33141a
This commit is contained in:
Pascal Massimino
2014-10-06 23:15:44 +02:00
parent 1bd4c2ad23
commit 2d9b0a4472
4 changed files with 51 additions and 13 deletions
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6
src/dsp/dsp.h
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@ -274,6 +274,12 @@ extern int (*WebPDispatchAlpha)(const uint8_t* alpha, int alpha_stride,
int width, int height,
uint8_t* dst, int dst_stride);
// Transfer packed 8b alpha[] values to green channel in dst[], zero'ing the
// A/R/B values. 'dst_stride' is the stride for dst[] in uint32_t units.
extern void (*WebPDispatchAlphaToGreen)(const uint8_t* alpha, int alpha_stride,
int width, int height,
uint32_t* dst, int dst_stride);
// Extract the alpha values from 32b values in argb[] and pack them into alpha[]
// (this is the opposite of WebPDispatchAlpha).
// Returns true if there's only trivial 0xff alpha values.