go.image/vp8: remove the filter look-up tables.
The benchmarks are a little slower, but the code is shorter.
benchmark old ns/op new ns/op delta
BenchmarkDecodeVP8SimpleFilter 621950 644184 +3.57%
BenchmarkDecodeVP8NormalFilter 4045745 4269431 +5.53%
LGTM=r
R=r, minux, ruiu
CC=golang-codereviews
https://golang.org/cl/108140045
diff --git a/vp8/filter.go b/vp8/filter.go
index 9a52451..ea6ed56 100644
--- a/vp8/filter.go
+++ b/vp8/filter.go
@@ -11,14 +11,14 @@
p0 := int(pix[index-1*jStep])
q0 := int(pix[index+0*jStep])
q1 := int(pix[index+1*jStep])
- if int(lutAbs[lutAbsBase+p0-q0])<<1+int(lutAbs[lutAbsBase+p1-q1])>>1 > level {
+ if abs(p0-q0)<<1+abs(p1-q1)>>1 > level {
continue
}
- a := 3*(q0-p0) + int(lutClamp127[lutClamp127Base+p1-q1])
- a1 := int(lutClamp15[lutClamp15Base+((a+4)>>3)])
- a2 := int(lutClamp15[lutClamp15Base+((a+3)>>3)])
- pix[index-1*jStep] = lutClamp255[lutClamp255Base+p0+a2]
- pix[index+0*jStep] = lutClamp255[lutClamp255Base+q0-a1]
+ a := 3*(q0-p0) + clamp127(p1-q1)
+ a1 := clamp15((a + 4) >> 3)
+ a2 := clamp15((a + 3) >> 3)
+ pix[index-1*jStep] = clamp255(p0 + a2)
+ pix[index+0*jStep] = clamp255(q0 - a1)
}
}
@@ -33,47 +33,46 @@
q1 := int(pix[index+1*jStep])
q2 := int(pix[index+2*jStep])
q3 := int(pix[index+3*jStep])
- if int(lutAbs[lutAbsBase+p0-q0])<<1+int(lutAbs[lutAbsBase+p1-q1])>>1 > level {
+ if abs(p0-q0)<<1+abs(p1-q1)>>1 > level {
continue
}
- if int(lutAbs[lutAbsBase+p3-p2]) > ilevel ||
- int(lutAbs[lutAbsBase+p2-p1]) > ilevel ||
- int(lutAbs[lutAbsBase+p1-p0]) > ilevel ||
- int(lutAbs[lutAbsBase+q1-q0]) > ilevel ||
- int(lutAbs[lutAbsBase+q2-q1]) > ilevel ||
- int(lutAbs[lutAbsBase+q3-q2]) > ilevel {
+ if abs(p3-p2) > ilevel ||
+ abs(p2-p1) > ilevel ||
+ abs(p1-p0) > ilevel ||
+ abs(q1-q0) > ilevel ||
+ abs(q2-q1) > ilevel ||
+ abs(q3-q2) > ilevel {
continue
}
- if int(lutAbs[lutAbsBase+p1-p0]) > hlevel || int(lutAbs[lutAbsBase+q1-q0]) > hlevel {
+ if abs(p1-p0) > hlevel || abs(q1-q0) > hlevel {
// Filter 2 pixels.
- a := 3*(q0-p0) + int(lutClamp127[lutClamp127Base+p1-q1])
- a1 := int(lutClamp15[lutClamp15Base+((a+4)>>3)])
- a2 := int(lutClamp15[lutClamp15Base+((a+3)>>3)])
- pix[index-1*jStep] = lutClamp255[lutClamp255Base+p0+a2]
- pix[index+0*jStep] = lutClamp255[lutClamp255Base+q0-a1]
+ a := 3*(q0-p0) + clamp127(p1-q1)
+ a1 := clamp15((a + 4) >> 3)
+ a2 := clamp15((a + 3) >> 3)
+ pix[index-1*jStep] = clamp255(p0 + a2)
+ pix[index+0*jStep] = clamp255(q0 - a1)
} else if fourNotSix {
// Filter 4 pixels.
a := 3 * (q0 - p0)
- a1 := int(lutClamp15[lutClamp15Base+((a+4)>>3)])
- a2 := int(lutClamp15[lutClamp15Base+((a+3)>>3)])
+ a1 := clamp15((a + 4) >> 3)
+ a2 := clamp15((a + 3) >> 3)
a3 := (a1 + 1) >> 1
- pix[index-2*jStep] = lutClamp255[lutClamp255Base+p1+a3]
- pix[index-1*jStep] = lutClamp255[lutClamp255Base+p0+a2]
- pix[index+0*jStep] = lutClamp255[lutClamp255Base+q0-a1]
- pix[index+1*jStep] = lutClamp255[lutClamp255Base+q1-a3]
+ pix[index-2*jStep] = clamp255(p1 + a3)
+ pix[index-1*jStep] = clamp255(p0 + a2)
+ pix[index+0*jStep] = clamp255(q0 - a1)
+ pix[index+1*jStep] = clamp255(q1 - a3)
} else {
// Filter 6 pixels.
- a := 3*(q0-p0) + int(lutClamp127[lutClamp127Base+p1-q1])
- a = int(lutClamp127[lutClamp127Base+a])
+ a := clamp127(3*(q0-p0) + clamp127(p1-q1))
a1 := (27*a + 63) >> 7
a2 := (18*a + 63) >> 7
a3 := (9*a + 63) >> 7
- pix[index-3*jStep] = lutClamp255[lutClamp255Base+p2+a3]
- pix[index-2*jStep] = lutClamp255[lutClamp255Base+p1+a2]
- pix[index-1*jStep] = lutClamp255[lutClamp255Base+p0+a1]
- pix[index+0*jStep] = lutClamp255[lutClamp255Base+q0-a1]
- pix[index+1*jStep] = lutClamp255[lutClamp255Base+q1-a2]
- pix[index+2*jStep] = lutClamp255[lutClamp255Base+q2-a3]
+ pix[index-3*jStep] = clamp255(p2 + a3)
+ pix[index-2*jStep] = clamp255(p1 + a2)
+ pix[index-1*jStep] = clamp255(p0 + a1)
+ pix[index+0*jStep] = clamp255(q0 - a1)
+ pix[index+1*jStep] = clamp255(q1 - a2)
+ pix[index+2*jStep] = clamp255(q2 - a3)
}
}
}
@@ -228,431 +227,39 @@
}
}
-// Look-up tables.
-//
-// TODO(nigeltao): are these actually worth it in Go, as opposed to C,
-// due to the bounds checking?
-
-const lutAbsBase = 255
-
-// lutAbs[lutAbsBase+x] is equal to abs(x), for x in [-255, 255].
-var lutAbs = [255 + 1 + 255]uint8{
- 0xff, 0xfe, 0xfd, 0xfc, 0xfb, 0xfa, 0xf9, 0xf8, 0xf7, 0xf6, 0xf5, 0xf4, 0xf3, 0xf2, 0xf1, 0xf0,
- 0xef, 0xee, 0xed, 0xec, 0xeb, 0xea, 0xe9, 0xe8, 0xe7, 0xe6, 0xe5, 0xe4, 0xe3, 0xe2, 0xe1, 0xe0,
- 0xdf, 0xde, 0xdd, 0xdc, 0xdb, 0xda, 0xd9, 0xd8, 0xd7, 0xd6, 0xd5, 0xd4, 0xd3, 0xd2, 0xd1, 0xd0,
- 0xcf, 0xce, 0xcd, 0xcc, 0xcb, 0xca, 0xc9, 0xc8, 0xc7, 0xc6, 0xc5, 0xc4, 0xc3, 0xc2, 0xc1, 0xc0,
- 0xbf, 0xbe, 0xbd, 0xbc, 0xbb, 0xba, 0xb9, 0xb8, 0xb7, 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1, 0xb0,
- 0xaf, 0xae, 0xad, 0xac, 0xab, 0xaa, 0xa9, 0xa8, 0xa7, 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1, 0xa0,
- 0x9f, 0x9e, 0x9d, 0x9c, 0x9b, 0x9a, 0x99, 0x98, 0x97, 0x96, 0x95, 0x94, 0x93, 0x92, 0x91, 0x90,
- 0x8f, 0x8e, 0x8d, 0x8c, 0x8b, 0x8a, 0x89, 0x88, 0x87, 0x86, 0x85, 0x84, 0x83, 0x82, 0x81, 0x80,
- 0x7f, 0x7e, 0x7d, 0x7c, 0x7b, 0x7a, 0x79, 0x78, 0x77, 0x76, 0x75, 0x74, 0x73, 0x72, 0x71, 0x70,
- 0x6f, 0x6e, 0x6d, 0x6c, 0x6b, 0x6a, 0x69, 0x68, 0x67, 0x66, 0x65, 0x64, 0x63, 0x62, 0x61, 0x60,
- 0x5f, 0x5e, 0x5d, 0x5c, 0x5b, 0x5a, 0x59, 0x58, 0x57, 0x56, 0x55, 0x54, 0x53, 0x52, 0x51, 0x50,
- 0x4f, 0x4e, 0x4d, 0x4c, 0x4b, 0x4a, 0x49, 0x48, 0x47, 0x46, 0x45, 0x44, 0x43, 0x42, 0x41, 0x40,
- 0x3f, 0x3e, 0x3d, 0x3c, 0x3b, 0x3a, 0x39, 0x38, 0x37, 0x36, 0x35, 0x34, 0x33, 0x32, 0x31, 0x30,
- 0x2f, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x29, 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21, 0x20,
- 0x1f, 0x1e, 0x1d, 0x1c, 0x1b, 0x1a, 0x19, 0x18, 0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
- 0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
- 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
- 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
- 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
- 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40,
- 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50,
- 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60,
- 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70,
- 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80,
- 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90,
- 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0,
- 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0,
- 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,
- 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0,
- 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0,
- 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0,
- 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
+func abs(x int) int {
+ if x < 0 {
+ return -x
+ }
+ return x
}
-const lutClamp15Base = 255
-
-// lutClamp15[lutClamp15Base+x] is equal to clamp(x, -16, +15), for x in [-255, 255].
-var lutClamp15 = [255 + 1 + 255]int8{
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10, -0x10,
- -0x0f, -0x0e, -0x0d, -0x0c, -0x0b, -0x0a, -0x09, -0x08,
- -0x07, -0x06, -0x05, -0x04, -0x03, -0x02, -0x01, +0x00,
- +0x01, +0x02, +0x03, +0x04, +0x05, +0x06, +0x07, +0x08,
- +0x09, +0x0a, +0x0b, +0x0c, +0x0d, +0x0e, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
- +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f, +0x0f,
+func clamp15(x int) int {
+ if x < -16 {
+ return -16
+ }
+ if x > 15 {
+ return 15
+ }
+ return x
}
-const lutClamp127Base = 1020
-
-// lutClamp127[lutClamp127Base+x] is equal to clamp(x, -128, +127), for x in [-1020, 1020].
-var lutClamp127 = [1020 + 1 + 1020]int8{
- -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80,
- -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80,
- -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80,
- -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80,
- -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80,
- -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80,
- -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80,
- -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80,
- -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80, -0x80,
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- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f,
- +0x7f,
+func clamp127(x int) int {
+ if x < -128 {
+ return -128
+ }
+ if x > 127 {
+ return 127
+ }
+ return x
}
-const lutClamp255Base = 255
-
-// lutClamp255[lutClamp255Base+x] is equal to clamp(x, 0, 255), for x in [-255, 510].
-var lutClamp255 = [255 + 1 + 510]uint8{
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
- 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
- 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
- 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40,
- 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50,
- 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60,
- 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70,
- 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80,
- 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90,
- 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0,
- 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0,
- 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0,
- 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0,
- 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0,
- 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0,
- 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+func clamp255(x int) uint8 {
+ if x < 0 {
+ return 0
+ }
+ if x > 255 {
+ return 255
+ }
+ return uint8(x)
}
