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8 Commits

Author SHA1 Message Date
James Zern
1aadf856c9 cosmetics: alpha_processing_sse2: add const to some casts 
source pointers are often cast to __m128*, retain the const in those
cases

Change-Id: I00ba15af2f43d125ceb2620e82fd43d420fbb9d3
 2015-02-05 23:50:39 -08:00
James Zern
a4c3a31b8f WEBP_TSAN_IGNORE_FUNCTION: fix gcc compat warning 
move the attribute to the front of the function to quiet clang warning:
GCC does not allow no_sanitize_thread attribute in this position on a
function definition

Change-Id: Ie4cc6e35a07bd00eab67d9cd6801bd2be9cfe676
 2014-10-16 18:06:43 +02:00
Pascal Massimino
80247291c6 mark some init function as being safe for thread_sanitizer. 
introduces the macro WEBP_TSAN_IGNORE_FUNCTION

Change-Id: I3de2b6c1a2076fba4da7ae50322551e026b2082b
 2014-10-16 16:34:07 +02:00
Pascal Massimino
2d9b0a4472 add WebPDispatchAlphaToGreen() to dsp 
SSE2 version is 2.1x faster

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

Change-Id: I01d9df0051c183b1ff5d6eb69961d4f43e33141a
 2014-10-06 23:15:44 +02:00
Pascal Massimino
cddd334050 Add a WebPExtractAlpha function to dsp 
This is the opposite of WebPDispatchAlpha

+ Implement the SSE2 version

Change-Id: I0c297309255f508c5261da8aad01f7e57f924d6c
 2014-09-15 08:12:03 +02:00
Pascal Massimino
690b491af1 fix loop bug in DispatchAlpha() 
* We were re-doing most of the work in plain-C as 'left-over'.
* we were always returning has_alpha = true because of a bad mask all_0xff

These bugs were conservative and silent, in the sense that we were 'just' doing
more work than necessary.

Now, the SSE2 version is really 2x faster than the C version.

Change-Id: I6c8132a267fe3c7a3d1fa70e7a5fcd10719543fa
 2014-09-11 22:35:08 +02:00
Pascal Massimino
a6bb9b17d8 SSE2 for inverse Mult(ARGB)Row and ApplyAlphaMultiply 
Change-Id: Iab5c0e4a4d2b31f86736a9b277e62b6e28c3d2b4
WebPMultRow: ~7x faster
WebPMultARGBRow: ~3x faster
ApplyAlphaMultiply: 60% faster
 2014-09-11 07:58:42 +02:00
skal
fc98edd936 add a DispatchAlpha() for SSE2 that handles 8 pixels at a time 
Only slightly faster.

Change-Id: Ie2e57e6a0950166124cf1075c6c9b45b7abdad8c
 2014-08-25 21:03:03 -07:00