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This commit is contained in:
Ryan Oldenburg 2022-06-20 21:16:26 -05:00
parent 7c91a69bca
commit e676e6cf22
1 changed files with 17 additions and 22 deletions
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39
src/pixie/internal.nim
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@ -125,30 +125,25 @@ proc toPremultipliedAlpha*(data: var seq[ColorRGBA | ColorRGBX]) {.raises: [].}
oddMask = mm_set1_epi16(cast[int16](0xff00))
div255 = mm_set1_epi16(cast[int16](0x8081))
for _ in 0 ..< data.len div 4:
var
color = mm_loadu_si128(data[i].addr)
alpha = mm_and_si128(color, alphaMask)
if mm_movemask_epi8(mm_cmpeq_epi16(alpha, alphaMask)) != 0xffff:
# If not all of the alpha values are 255, premultiply
let
values = mm_loadu_si128(data[i].addr)
alpha = mm_and_si128(values, alphaMask)
eq = mm_cmpeq_epi8(values, alphaMask)
if (mm_movemask_epi8(eq) and 0x00008888) != 0x00008888:
let
evenMultiplier = mm_or_si128(alpha, mm_srli_epi32(alpha, 16))
oddMultiplier = mm_or_si128(evenMultiplier, alphaMask)
var
colorEven = mm_slli_epi16(color, 8)
colorOdd = mm_and_si128(color, oddMask)
alpha = mm_or_si128(alpha, mm_srli_epi32(alpha, 16))
colorEven = mm_mulhi_epu16(colorEven, alpha)
colorOdd = mm_mulhi_epu16(colorOdd, alpha)
colorEven = mm_srli_epi16(mm_mulhi_epu16(colorEven, div255), 7)
colorOdd = mm_srli_epi16(mm_mulhi_epu16(colorOdd, div255), 7)
color = mm_or_si128(colorEven, mm_slli_epi16(colorOdd, 8))
color = mm_or_si128(
mm_and_si128(alpha, alphaMask), mm_and_si128(color, notAlphaMask)
colorsEven = mm_slli_epi16(values, 8)
colorsOdd = mm_and_si128(values, oddMask)
colorsEven = mm_mulhi_epu16(colorsEven, evenMultiplier)
colorsOdd = mm_mulhi_epu16(colorsOdd, oddMultiplier)
colorsEven = mm_srli_epi16(mm_mulhi_epu16(colorsEven, div255), 7)
colorsOdd = mm_srli_epi16(mm_mulhi_epu16(colorsOdd, div255), 7)
mm_storeu_si128(
data[i].addr,
mm_or_si128(colorsEven, mm_slli_epi16(colorsOdd, 8))
)
mm_storeu_si128(data[i].addr, color)
i += 4
# Convert whatever is left