| // Copyright 2014 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package vp8 |
| |
| // filter2 modifies a 2-pixel-wide or 2-pixel-high band along an edge. |
| func filter2(pix []byte, thresh int, index int, iStep int, jStep int) { |
| for i := 0; i < 16; i, index = i+1, index+iStep { |
| p1 := int(pix[index-2*jStep]) |
| 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 > thresh { |
| 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] |
| } |
| } |
| |
| // TODO(nigeltao): filter4 and filter6 functions, for normal filtering. |
| |
| // simpleFilter implements the simple filter, as specified in section 15.2. |
| func (d *Decoder) simpleFilter() { |
| for mby := 0; mby < d.mbh; mby++ { |
| for mbx := 0; mbx < d.mbw; mbx++ { |
| f := d.perMBFilterParams[d.mbw*mby+mbx] |
| if f.limit == 0 { |
| continue |
| } |
| index := (mby*d.img.YStride + mbx) * 16 |
| if mbx > 0 { |
| filter2(d.img.Y, int(f.limit)+4, index, d.img.YStride, 1) |
| } |
| if f.inner { |
| filter2(d.img.Y, int(f.limit), index+4, d.img.YStride, 1) |
| filter2(d.img.Y, int(f.limit), index+8, d.img.YStride, 1) |
| filter2(d.img.Y, int(f.limit), index+12, d.img.YStride, 1) |
| } |
| if mby > 0 { |
| filter2(d.img.Y, int(f.limit)+4, index, 1, d.img.YStride) |
| } |
| if f.inner { |
| filter2(d.img.Y, int(f.limit), index+d.img.YStride*4, 1, d.img.YStride) |
| filter2(d.img.Y, int(f.limit), index+d.img.YStride*8, 1, d.img.YStride) |
| filter2(d.img.Y, int(f.limit), index+d.img.YStride*12, 1, d.img.YStride) |
| } |
| } |
| } |
| } |
| |
| // filterParam holds the loop filter parameters for a macroblock. |
| type filterParam struct { |
| limit uint8 |
| inner bool |
| innerLevel uint8 |
| hevThresh uint8 |
| } |
| |
| // computeFilterParams computes the loop filter parameters, as specified in |
| // section 15.4. |
| func (d *Decoder) computeFilterParams() { |
| for i := range d.filterParams { |
| baseLevel := d.filterHeader.level |
| if d.segmentHeader.useSegment { |
| baseLevel = d.segmentHeader.filterStrength[i] |
| if d.segmentHeader.relativeDelta { |
| baseLevel += d.filterHeader.level |
| } |
| } |
| |
| for j := range d.filterParams[i] { |
| p := &d.filterParams[i][j] |
| p.inner = j != 0 |
| level := baseLevel |
| if d.filterHeader.useLFDelta { |
| // The libwebp C code has a "TODO: only CURRENT is handled for now." |
| level += d.filterHeader.refLFDelta[0] |
| if j != 0 { |
| level += d.filterHeader.modeLFDelta[0] |
| } |
| } |
| if level <= 0 { |
| p.limit = 0 |
| continue |
| } |
| if level > 63 { |
| level = 63 |
| } |
| ilevel := level |
| if d.filterHeader.sharpness > 0 { |
| if d.filterHeader.sharpness > 4 { |
| ilevel >>= 2 |
| } else { |
| ilevel >>= 1 |
| } |
| if x := int8(9 - d.filterHeader.sharpness); ilevel > x { |
| ilevel = x |
| } |
| } |
| if ilevel < 1 { |
| ilevel = 1 |
| } |
| p.innerLevel = uint8(ilevel) |
| p.limit = uint8(2*level + ilevel) |
| if d.frameHeader.KeyFrame { |
| if level < 15 { |
| p.hevThresh = 0 |
| } else if level < 40 { |
| p.hevThresh = 1 |
| } else { |
| p.hevThresh = 2 |
| } |
| } else { |
| if level < 15 { |
| p.hevThresh = 0 |
| } else if level < 20 { |
| p.hevThresh = 1 |
| } else if level < 40 { |
| p.hevThresh = 2 |
| } else { |
| p.hevThresh = 3 |
| } |
| } |
| } |
| } |
| } |
| |
| // 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, |
| } |
| |
| 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, |
| } |
| |
| const lutClamp127Base = 255 |
| |
| // lutClamp127[lutClamp127Base+x] is equal to clamp(x, -128, +127), for x in [-255, 255]. |
| var lutClamp127 = [255 + 1 + 255]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, |
| -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, |
| -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, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, +0x7f, |
| } |
| |
| 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, |
| } |
