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 @@ func filter2(pix []byte, level, index, iStep, jStep int) { 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 @@ func filter246(pix []byte, n, level, ilevel, hlevel, index, iStep, jStep int, fo 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 @@ func (d *Decoder) computeFilterParams() { } } -// 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, - 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-// 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, - 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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) }