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faster packAlphaValues, better test

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Ryan Oldenburg 2021-11-28 03:08:25 -06:00
parent 61e78bcc6a
commit 50621aec50
2 changed files with 5 additions and 16 deletions
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19
src/pixie/internal.nim
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@ -105,18 +105,7 @@ when defined(amd64) and not defined(pixieNoSimd):
proc unpackAlphaValues*(v: M128i): M128i {.inline, raises: [].} =
## Unpack the first 32 bits into 4 rgba(0, 0, 0, value)
let mask = cast[M128i]([uint8.high.uint64, 0])
var
i = mm_and_si128(v, mask)
j = mm_and_si128(v, mm_slli_si128(mask, 1))
k = mm_and_si128(v, mm_slli_si128(mask, 2))
l = mm_and_si128(v, mm_slli_si128(mask, 3))
# Shift the values to uint32 `a`
i = mm_slli_si128(i, 3)
j = mm_slli_si128(j, 6)
k = mm_slli_si128(k, 9)
l = mm_slli_si128(l, 12)
result = mm_or_si128(mm_or_si128(i, j), mm_or_si128(k, l))
let
a = mm_unpacklo_epi8(v, mm_setzero_si128())
b = mm_unpacklo_epi8(a, mm_setzero_si128())
result = mm_slli_epi32(b, 24) # Shift the values to uint32 `a`

2
tests/test_images.nim
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@ -145,7 +145,7 @@ block: # Test conversion between image and mask
originalMask = newMask(100, 100)
let p = newPath()
p.rect(10, 10, 80, 80)
p.circle(50, 50, 25)
originalImage.fillPath(p, rgba(255, 0, 0, 255))
originalMask.fillPath(p)