diff options
Diffstat (limited to 'vendor/golang.org/x/image')
| -rw-r--r-- | vendor/golang.org/x/image/LICENSE | 27 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/PATENTS | 22 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/riff/riff.go | 193 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/vp8/decode.go | 403 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/vp8/filter.go | 273 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/vp8/idct.go | 98 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/vp8/partition.go | 129 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/vp8/pred.go | 201 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/vp8/predfunc.go | 553 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/vp8/quant.go | 98 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/vp8/reconstruct.go | 442 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/vp8/token.go | 381 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/vp8l/decode.go | 603 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/vp8l/huffman.go | 245 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/vp8l/transform.go | 299 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/webp/decode.go | 276 | ||||
| -rw-r--r-- | vendor/golang.org/x/image/webp/doc.go | 9 |
17 files changed, 0 insertions, 4252 deletions
diff --git a/vendor/golang.org/x/image/LICENSE b/vendor/golang.org/x/image/LICENSE deleted file mode 100644 index 2a7cf70da..000000000 --- a/vendor/golang.org/x/image/LICENSE +++ /dev/null @@ -1,27 +0,0 @@ -Copyright 2009 The Go Authors. - -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions are -met: - - * Redistributions of source code must retain the above copyright -notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above -copyright notice, this list of conditions and the following disclaimer -in the documentation and/or other materials provided with the -distribution. - * Neither the name of Google LLC nor the names of its -contributors may be used to endorse or promote products derived from -this software without specific prior written permission. - -THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/vendor/golang.org/x/image/PATENTS b/vendor/golang.org/x/image/PATENTS deleted file mode 100644 index 733099041..000000000 --- a/vendor/golang.org/x/image/PATENTS +++ /dev/null @@ -1,22 +0,0 @@ -Additional IP Rights Grant (Patents) - -"This implementation" means the copyrightable works distributed by -Google as part of the Go project. - -Google hereby grants to You a perpetual, worldwide, non-exclusive, -no-charge, royalty-free, irrevocable (except as stated in this section) -patent license to make, have made, use, offer to sell, sell, import, -transfer and otherwise run, modify and propagate the contents of this -implementation of Go, where such license applies only to those patent -claims, both currently owned or controlled by Google and acquired in -the future, licensable by Google that are necessarily infringed by this -implementation of Go. This grant does not include claims that would be -infringed only as a consequence of further modification of this -implementation. If you or your agent or exclusive licensee institute or -order or agree to the institution of patent litigation against any -entity (including a cross-claim or counterclaim in a lawsuit) alleging -that this implementation of Go or any code incorporated within this -implementation of Go constitutes direct or contributory patent -infringement, or inducement of patent infringement, then any patent -rights granted to you under this License for this implementation of Go -shall terminate as of the date such litigation is filed. diff --git a/vendor/golang.org/x/image/riff/riff.go b/vendor/golang.org/x/image/riff/riff.go deleted file mode 100644 index 38dc0e568..000000000 --- a/vendor/golang.org/x/image/riff/riff.go +++ /dev/null @@ -1,193 +0,0 @@ -// 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 riff implements the Resource Interchange File Format, used by media -// formats such as AVI, WAVE and WEBP. -// -// A RIFF stream contains a sequence of chunks. Each chunk consists of an 8-byte -// header (containing a 4-byte chunk type and a 4-byte chunk length), the chunk -// data (presented as an io.Reader), and some padding bytes. -// -// A detailed description of the format is at -// http://www.tactilemedia.com/info/MCI_Control_Info.html -package riff // import "golang.org/x/image/riff" - -import ( - "errors" - "io" - "io/ioutil" - "math" -) - -var ( - errMissingPaddingByte = errors.New("riff: missing padding byte") - errMissingRIFFChunkHeader = errors.New("riff: missing RIFF chunk header") - errListSubchunkTooLong = errors.New("riff: list subchunk too long") - errShortChunkData = errors.New("riff: short chunk data") - errShortChunkHeader = errors.New("riff: short chunk header") - errStaleReader = errors.New("riff: stale reader") -) - -// u32 decodes the first four bytes of b as a little-endian integer. -func u32(b []byte) uint32 { - return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24 -} - -const chunkHeaderSize = 8 - -// FourCC is a four character code. -type FourCC [4]byte - -// LIST is the "LIST" FourCC. -var LIST = FourCC{'L', 'I', 'S', 'T'} - -// NewReader returns the RIFF stream's form type, such as "AVI " or "WAVE", and -// its chunks as a *Reader. -func NewReader(r io.Reader) (formType FourCC, data *Reader, err error) { - var buf [chunkHeaderSize]byte - if _, err := io.ReadFull(r, buf[:]); err != nil { - if err == io.EOF || err == io.ErrUnexpectedEOF { - err = errMissingRIFFChunkHeader - } - return FourCC{}, nil, err - } - if buf[0] != 'R' || buf[1] != 'I' || buf[2] != 'F' || buf[3] != 'F' { - return FourCC{}, nil, errMissingRIFFChunkHeader - } - return NewListReader(u32(buf[4:]), r) -} - -// NewListReader returns a LIST chunk's list type, such as "movi" or "wavl", -// and its chunks as a *Reader. -func NewListReader(chunkLen uint32, chunkData io.Reader) (listType FourCC, data *Reader, err error) { - if chunkLen < 4 { - return FourCC{}, nil, errShortChunkData - } - z := &Reader{r: chunkData} - if _, err := io.ReadFull(chunkData, z.buf[:4]); err != nil { - if err == io.EOF || err == io.ErrUnexpectedEOF { - err = errShortChunkData - } - return FourCC{}, nil, err - } - z.totalLen = chunkLen - 4 - return FourCC{z.buf[0], z.buf[1], z.buf[2], z.buf[3]}, z, nil -} - -// Reader reads chunks from an underlying io.Reader. -type Reader struct { - r io.Reader - err error - - totalLen uint32 - chunkLen uint32 - - chunkReader *chunkReader - buf [chunkHeaderSize]byte - padded bool -} - -// Next returns the next chunk's ID, length and data. It returns io.EOF if there -// are no more chunks. The io.Reader returned becomes stale after the next Next -// call, and should no longer be used. -// -// It is valid to call Next even if all of the previous chunk's data has not -// been read. -func (z *Reader) Next() (chunkID FourCC, chunkLen uint32, chunkData io.Reader, err error) { - if z.err != nil { - return FourCC{}, 0, nil, z.err - } - - // Drain the rest of the previous chunk. - if z.chunkLen != 0 { - want := z.chunkLen - var got int64 - got, z.err = io.Copy(ioutil.Discard, z.chunkReader) - if z.err == nil && uint32(got) != want { - z.err = errShortChunkData - } - if z.err != nil { - return FourCC{}, 0, nil, z.err - } - } - z.chunkReader = nil - if z.padded { - if z.totalLen == 0 { - z.err = errListSubchunkTooLong - return FourCC{}, 0, nil, z.err - } - z.totalLen-- - _, z.err = io.ReadFull(z.r, z.buf[:1]) - if z.err != nil { - if z.err == io.EOF { - z.err = errMissingPaddingByte - } - return FourCC{}, 0, nil, z.err - } - } - - // We are done if we have no more data. - if z.totalLen == 0 { - z.err = io.EOF - return FourCC{}, 0, nil, z.err - } - - // Read the next chunk header. - if z.totalLen < chunkHeaderSize { - z.err = errShortChunkHeader - return FourCC{}, 0, nil, z.err - } - z.totalLen -= chunkHeaderSize - if _, z.err = io.ReadFull(z.r, z.buf[:chunkHeaderSize]); z.err != nil { - if z.err == io.EOF || z.err == io.ErrUnexpectedEOF { - z.err = errShortChunkHeader - } - return FourCC{}, 0, nil, z.err - } - chunkID = FourCC{z.buf[0], z.buf[1], z.buf[2], z.buf[3]} - z.chunkLen = u32(z.buf[4:]) - if z.chunkLen > z.totalLen { - z.err = errListSubchunkTooLong - return FourCC{}, 0, nil, z.err - } - z.padded = z.chunkLen&1 == 1 - z.chunkReader = &chunkReader{z} - return chunkID, z.chunkLen, z.chunkReader, nil -} - -type chunkReader struct { - z *Reader -} - -func (c *chunkReader) Read(p []byte) (int, error) { - if c != c.z.chunkReader { - return 0, errStaleReader - } - z := c.z - if z.err != nil { - if z.err == io.EOF { - return 0, errStaleReader - } - return 0, z.err - } - - n := int(z.chunkLen) - if n == 0 { - return 0, io.EOF - } - if n < 0 { - // Converting uint32 to int overflowed. - n = math.MaxInt32 - } - if n > len(p) { - n = len(p) - } - n, err := z.r.Read(p[:n]) - z.totalLen -= uint32(n) - z.chunkLen -= uint32(n) - if err != io.EOF { - z.err = err - } - return n, err -} diff --git a/vendor/golang.org/x/image/vp8/decode.go b/vendor/golang.org/x/image/vp8/decode.go deleted file mode 100644 index 2aa9fee03..000000000 --- a/vendor/golang.org/x/image/vp8/decode.go +++ /dev/null @@ -1,403 +0,0 @@ -// Copyright 2011 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 implements a decoder for the VP8 lossy image format. -// -// The VP8 specification is RFC 6386. -package vp8 // import "golang.org/x/image/vp8" - -// This file implements the top-level decoding algorithm. - -import ( - "errors" - "image" - "io" -) - -// limitReader wraps an io.Reader to read at most n bytes from it. -type limitReader struct { - r io.Reader - n int -} - -// ReadFull reads exactly len(p) bytes into p. -func (r *limitReader) ReadFull(p []byte) error { - if len(p) > r.n { - return io.ErrUnexpectedEOF - } - n, err := io.ReadFull(r.r, p) - r.n -= n - return err -} - -// FrameHeader is a frame header, as specified in section 9.1. -type FrameHeader struct { - KeyFrame bool - VersionNumber uint8 - ShowFrame bool - FirstPartitionLen uint32 - Width int - Height int - XScale uint8 - YScale uint8 -} - -const ( - nSegment = 4 - nSegmentProb = 3 -) - -// segmentHeader holds segment-related header information. -type segmentHeader struct { - useSegment bool - updateMap bool - relativeDelta bool - quantizer [nSegment]int8 - filterStrength [nSegment]int8 - prob [nSegmentProb]uint8 -} - -const ( - nRefLFDelta = 4 - nModeLFDelta = 4 -) - -// filterHeader holds filter-related header information. -type filterHeader struct { - simple bool - level int8 - sharpness uint8 - useLFDelta bool - refLFDelta [nRefLFDelta]int8 - modeLFDelta [nModeLFDelta]int8 - perSegmentLevel [nSegment]int8 -} - -// mb is the per-macroblock decode state. A decoder maintains mbw+1 of these -// as it is decoding macroblocks left-to-right and top-to-bottom: mbw for the -// macroblocks in the row above, and one for the macroblock to the left. -type mb struct { - // pred is the predictor mode for the 4 bottom or right 4x4 luma regions. - pred [4]uint8 - // nzMask is a mask of 8 bits: 4 for the bottom or right 4x4 luma regions, - // and 2 + 2 for the bottom or right 4x4 chroma regions. A 1 bit indicates - // that region has non-zero coefficients. - nzMask uint8 - // nzY16 is a 0/1 value that is 1 if the macroblock used Y16 prediction and - // had non-zero coefficients. - nzY16 uint8 -} - -// Decoder decodes VP8 bitstreams into frames. Decoding one frame consists of -// calling Init, DecodeFrameHeader and then DecodeFrame in that order. -// A Decoder can be re-used to decode multiple frames. -type Decoder struct { - // r is the input bitsream. - r limitReader - // scratch is a scratch buffer. - scratch [8]byte - // img is the YCbCr image to decode into. - img *image.YCbCr - // mbw and mbh are the number of 16x16 macroblocks wide and high the image is. - mbw, mbh int - // frameHeader is the frame header. When decoding multiple frames, - // frames that aren't key frames will inherit the Width, Height, - // XScale and YScale of the most recent key frame. - frameHeader FrameHeader - // Other headers. - segmentHeader segmentHeader - filterHeader filterHeader - // The image data is divided into a number of independent partitions. - // There is 1 "first partition" and between 1 and 8 "other partitions" - // for coefficient data. - fp partition - op [8]partition - nOP int - // Quantization factors. - quant [nSegment]quant - // DCT/WHT coefficient decoding probabilities. - tokenProb [nPlane][nBand][nContext][nProb]uint8 - useSkipProb bool - skipProb uint8 - // Loop filter parameters. - filterParams [nSegment][2]filterParam - perMBFilterParams []filterParam - - // The eight fields below relate to the current macroblock being decoded. - // - // Segment-based adjustments. - segment int - // Per-macroblock state for the macroblock immediately left of and those - // macroblocks immediately above the current macroblock. - leftMB mb - upMB []mb - // Bitmasks for which 4x4 regions of coeff contain non-zero coefficients. - nzDCMask, nzACMask uint32 - // Predictor modes. - usePredY16 bool // The libwebp C code calls this !is_i4x4_. - predY16 uint8 - predC8 uint8 - predY4 [4][4]uint8 - - // The two fields below form a workspace for reconstructing a macroblock. - // Their specific sizes are documented in reconstruct.go. - coeff [1*16*16 + 2*8*8 + 1*4*4]int16 - ybr [1 + 16 + 1 + 8][32]uint8 -} - -// NewDecoder returns a new Decoder. -func NewDecoder() *Decoder { - return &Decoder{} -} - -// Init initializes the decoder to read at most n bytes from r. -func (d *Decoder) Init(r io.Reader, n int) { - d.r = limitReader{r, n} -} - -// DecodeFrameHeader decodes the frame header. -func (d *Decoder) DecodeFrameHeader() (fh FrameHeader, err error) { - // All frame headers are at least 3 bytes long. - b := d.scratch[:3] - if err = d.r.ReadFull(b); err != nil { - return - } - d.frameHeader.KeyFrame = (b[0] & 1) == 0 - d.frameHeader.VersionNumber = (b[0] >> 1) & 7 - d.frameHeader.ShowFrame = (b[0]>>4)&1 == 1 - d.frameHeader.FirstPartitionLen = uint32(b[0])>>5 | uint32(b[1])<<3 | uint32(b[2])<<11 - if !d.frameHeader.KeyFrame { - return d.frameHeader, nil - } - // Frame headers for key frames are an additional 7 bytes long. - b = d.scratch[:7] - if err = d.r.ReadFull(b); err != nil { - return - } - // Check the magic sync code. - if b[0] != 0x9d || b[1] != 0x01 || b[2] != 0x2a { - err = errors.New("vp8: invalid format") - return - } - d.frameHeader.Width = int(b[4]&0x3f)<<8 | int(b[3]) - d.frameHeader.Height = int(b[6]&0x3f)<<8 | int(b[5]) - d.frameHeader.XScale = b[4] >> 6 - d.frameHeader.YScale = b[6] >> 6 - d.mbw = (d.frameHeader.Width + 0x0f) >> 4 - d.mbh = (d.frameHeader.Height + 0x0f) >> 4 - d.segmentHeader = segmentHeader{ - prob: [3]uint8{0xff, 0xff, 0xff}, - } - d.tokenProb = defaultTokenProb - d.segment = 0 - return d.frameHeader, nil -} - -// ensureImg ensures that d.img is large enough to hold the decoded frame. -func (d *Decoder) ensureImg() { - if d.img != nil { - p0, p1 := d.img.Rect.Min, d.img.Rect.Max - if p0.X == 0 && p0.Y == 0 && p1.X >= 16*d.mbw && p1.Y >= 16*d.mbh { - return - } - } - m := image.NewYCbCr(image.Rect(0, 0, 16*d.mbw, 16*d.mbh), image.YCbCrSubsampleRatio420) - d.img = m.SubImage(image.Rect(0, 0, d.frameHeader.Width, d.frameHeader.Height)).(*image.YCbCr) - d.perMBFilterParams = make([]filterParam, d.mbw*d.mbh) - d.upMB = make([]mb, d.mbw) -} - -// parseSegmentHeader parses the segment header, as specified in section 9.3. -func (d *Decoder) parseSegmentHeader() { - d.segmentHeader.useSegment = d.fp.readBit(uniformProb) - if !d.segmentHeader.useSegment { - d.segmentHeader.updateMap = false - return - } - d.segmentHeader.updateMap = d.fp.readBit(uniformProb) - if d.fp.readBit(uniformProb) { - d.segmentHeader.relativeDelta = !d.fp.readBit(uniformProb) - for i := range d.segmentHeader.quantizer { - d.segmentHeader.quantizer[i] = int8(d.fp.readOptionalInt(uniformProb, 7)) - } - for i := range d.segmentHeader.filterStrength { - d.segmentHeader.filterStrength[i] = int8(d.fp.readOptionalInt(uniformProb, 6)) - } - } - if !d.segmentHeader.updateMap { - return - } - for i := range d.segmentHeader.prob { - if d.fp.readBit(uniformProb) { - d.segmentHeader.prob[i] = uint8(d.fp.readUint(uniformProb, 8)) - } else { - d.segmentHeader.prob[i] = 0xff - } - } -} - -// parseFilterHeader parses the filter header, as specified in section 9.4. -func (d *Decoder) parseFilterHeader() { - d.filterHeader.simple = d.fp.readBit(uniformProb) - d.filterHeader.level = int8(d.fp.readUint(uniformProb, 6)) - d.filterHeader.sharpness = uint8(d.fp.readUint(uniformProb, 3)) - d.filterHeader.useLFDelta = d.fp.readBit(uniformProb) - if d.filterHeader.useLFDelta && d.fp.readBit(uniformProb) { - for i := range d.filterHeader.refLFDelta { - d.filterHeader.refLFDelta[i] = int8(d.fp.readOptionalInt(uniformProb, 6)) - } - for i := range d.filterHeader.modeLFDelta { - d.filterHeader.modeLFDelta[i] = int8(d.fp.readOptionalInt(uniformProb, 6)) - } - } - if d.filterHeader.level == 0 { - return - } - if d.segmentHeader.useSegment { - for i := range d.filterHeader.perSegmentLevel { - strength := d.segmentHeader.filterStrength[i] - if d.segmentHeader.relativeDelta { - strength += d.filterHeader.level - } - d.filterHeader.perSegmentLevel[i] = strength - } - } else { - d.filterHeader.perSegmentLevel[0] = d.filterHeader.level - } - d.computeFilterParams() -} - -// parseOtherPartitions parses the other partitions, as specified in section 9.5. -func (d *Decoder) parseOtherPartitions() error { - const maxNOP = 1 << 3 - var partLens [maxNOP]int - d.nOP = 1 << d.fp.readUint(uniformProb, 2) - - // The final partition length is implied by the remaining chunk data - // (d.r.n) and the other d.nOP-1 partition lengths. Those d.nOP-1 partition - // lengths are stored as 24-bit uints, i.e. up to 16 MiB per partition. - n := 3 * (d.nOP - 1) - partLens[d.nOP-1] = d.r.n - n - if partLens[d.nOP-1] < 0 { - return io.ErrUnexpectedEOF - } - if n > 0 { - buf := make([]byte, n) - if err := d.r.ReadFull(buf); err != nil { - return err - } - for i := 0; i < d.nOP-1; i++ { - pl := int(buf[3*i+0]) | int(buf[3*i+1])<<8 | int(buf[3*i+2])<<16 - if pl > partLens[d.nOP-1] { - return io.ErrUnexpectedEOF - } - partLens[i] = pl - partLens[d.nOP-1] -= pl - } - } - - // We check if the final partition length can also fit into a 24-bit uint. - // Strictly speaking, this isn't part of the spec, but it guards against a - // malicious WEBP image that is too large to ReadFull the encoded DCT - // coefficients into memory, whether that's because the actual WEBP file is - // too large, or whether its RIFF metadata lists too large a chunk. - if 1<<24 <= partLens[d.nOP-1] { - return errors.New("vp8: too much data to decode") - } - - buf := make([]byte, d.r.n) - if err := d.r.ReadFull(buf); err != nil { - return err - } - for i, pl := range partLens { - if i == d.nOP { - break - } - d.op[i].init(buf[:pl]) - buf = buf[pl:] - } - return nil -} - -// parseOtherHeaders parses header information other than the frame header. -func (d *Decoder) parseOtherHeaders() error { - // Initialize and parse the first partition. - firstPartition := make([]byte, d.frameHeader.FirstPartitionLen) - if err := d.r.ReadFull(firstPartition); err != nil { - return err - } - d.fp.init(firstPartition) - if d.frameHeader.KeyFrame { - // Read and ignore the color space and pixel clamp values. They are - // specified in section 9.2, but are unimplemented. - d.fp.readBit(uniformProb) - d.fp.readBit(uniformProb) - } - d.parseSegmentHeader() - d.parseFilterHeader() - if err := d.parseOtherPartitions(); err != nil { - return err - } - d.parseQuant() - if !d.frameHeader.KeyFrame { - // Golden and AltRef frames are specified in section 9.7. - // TODO(nigeltao): implement. Note that they are only used for video, not still images. - return errors.New("vp8: Golden / AltRef frames are not implemented") - } - // Read and ignore the refreshLastFrameBuffer bit, specified in section 9.8. - // It applies only to video, and not still images. - d.fp.readBit(uniformProb) - d.parseTokenProb() - d.useSkipProb = d.fp.readBit(uniformProb) - if d.useSkipProb { - d.skipProb = uint8(d.fp.readUint(uniformProb, 8)) - } - if d.fp.unexpectedEOF { - return io.ErrUnexpectedEOF - } - return nil -} - -// DecodeFrame decodes the frame and returns it as an YCbCr image. -// The image's contents are valid up until the next call to Decoder.Init. -func (d *Decoder) DecodeFrame() (*image.YCbCr, error) { - d.ensureImg() - if err := d.parseOtherHeaders(); err != nil { - return nil, err - } - // Reconstruct the rows. - for mbx := 0; mbx < d.mbw; mbx++ { - d.upMB[mbx] = mb{} - } - for mby := 0; mby < d.mbh; mby++ { - d.leftMB = mb{} - for mbx := 0; mbx < d.mbw; mbx++ { - skip := d.reconstruct(mbx, mby) - fs := d.filterParams[d.segment][btou(!d.usePredY16)] - fs.inner = fs.inner || !skip - d.perMBFilterParams[d.mbw*mby+mbx] = fs - } - } - if d.fp.unexpectedEOF { - return nil, io.ErrUnexpectedEOF - } - for i := 0; i < d.nOP; i++ { - if d.op[i].unexpectedEOF { - return nil, io.ErrUnexpectedEOF - } - } - // Apply the loop filter. - // - // Even if we are using per-segment levels, section 15 says that "loop - // filtering must be skipped entirely if loop_filter_level at either the - // frame header level or macroblock override level is 0". - if d.filterHeader.level != 0 { - if d.filterHeader.simple { - d.simpleFilter() - } else { - d.normalFilter() - } - } - return d.img, nil -} diff --git a/vendor/golang.org/x/image/vp8/filter.go b/vendor/golang.org/x/image/vp8/filter.go deleted file mode 100644 index e34a811b1..000000000 --- a/vendor/golang.org/x/image/vp8/filter.go +++ /dev/null @@ -1,273 +0,0 @@ -// 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, level, index, iStep, jStep int) { - for n := 16; n > 0; n, index = n-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 abs(p0-q0)<<1+abs(p1-q1)>>1 > level { - continue - } - 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) - } -} - -// filter246 modifies a 2-, 4- or 6-pixel wide or high band along an edge. -func filter246(pix []byte, n, level, ilevel, hlevel, index, iStep, jStep int, fourNotSix bool) { - for ; n > 0; n, index = n-1, index+iStep { - p3 := int(pix[index-4*jStep]) - p2 := int(pix[index-3*jStep]) - p1 := int(pix[index-2*jStep]) - p0 := int(pix[index-1*jStep]) - q0 := int(pix[index+0*jStep]) - q1 := int(pix[index+1*jStep]) - q2 := int(pix[index+2*jStep]) - q3 := int(pix[index+3*jStep]) - if abs(p0-q0)<<1+abs(p1-q1)>>1 > level { - continue - } - 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 abs(p1-p0) > hlevel || abs(q1-q0) > hlevel { - // Filter 2 pixels. - 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 := clamp15((a + 4) >> 3) - a2 := clamp15((a + 3) >> 3) - a3 := (a1 + 1) >> 1 - 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 := 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] = 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) - } - } -} - -// 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.level == 0 { - continue - } - l := int(f.level) - yIndex := (mby*d.img.YStride + mbx) * 16 - if mbx > 0 { - filter2(d.img.Y, l+4, yIndex, d.img.YStride, 1) - } - if f.inner { - filter2(d.img.Y, l, yIndex+0x4, d.img.YStride, 1) - filter2(d.img.Y, l, yIndex+0x8, d.img.YStride, 1) - filter2(d.img.Y, l, yIndex+0xc, d.img.YStride, 1) - } - if mby > 0 { - filter2(d.img.Y, l+4, yIndex, 1, d.img.YStride) - } - if f.inner { - filter2(d.img.Y, l, yIndex+d.img.YStride*0x4, 1, d.img.YStride) - filter2(d.img.Y, l, yIndex+d.img.YStride*0x8, 1, d.img.YStride) - filter2(d.img.Y, l, yIndex+d.img.YStride*0xc, 1, d.img.YStride) - } - } - } -} - -// normalFilter implements the normal filter, as specified in section 15.3. -func (d *Decoder) normalFilter() { - for mby := 0; mby < d.mbh; mby++ { - for mbx := 0; mbx < d.mbw; mbx++ { - f := d.perMBFilterParams[d.mbw*mby+mbx] - if f.level == 0 { - continue - } - l, il, hl := int(f.level), int(f.ilevel), int(f.hlevel) - yIndex := (mby*d.img.YStride + mbx) * 16 - cIndex := (mby*d.img.CStride + mbx) * 8 - if mbx > 0 { - filter246(d.img.Y, 16, l+4, il, hl, yIndex, d.img.YStride, 1, false) - filter246(d.img.Cb, 8, l+4, il, hl, cIndex, d.img.CStride, 1, false) - filter246(d.img.Cr, 8, l+4, il, hl, cIndex, d.img.CStride, 1, false) - } - if f.inner { - filter246(d.img.Y, 16, l, il, hl, yIndex+0x4, d.img.YStride, 1, true) - filter246(d.img.Y, 16, l, il, hl, yIndex+0x8, d.img.YStride, 1, true) - filter246(d.img.Y, 16, l, il, hl, yIndex+0xc, d.img.YStride, 1, true) - filter246(d.img.Cb, 8, l, il, hl, cIndex+0x4, d.img.CStride, 1, true) - filter246(d.img.Cr, 8, l, il, hl, cIndex+0x4, d.img.CStride, 1, true) - } - if mby > 0 { - filter246(d.img.Y, 16, l+4, il, hl, yIndex, 1, d.img.YStride, false) - filter246(d.img.Cb, 8, l+4, il, hl, cIndex, 1, d.img.CStride, false) - filter246(d.img.Cr, 8, l+4, il, hl, cIndex, 1, d.img.CStride, false) - } - if f.inner { - filter246(d.img.Y, 16, l, il, hl, yIndex+d.img.YStride*0x4, 1, d.img.YStride, true) - filter246(d.img.Y, 16, l, il, hl, yIndex+d.img.YStride*0x8, 1, d.img.YStride, true) - filter246(d.img.Y, 16, l, il, hl, yIndex+d.img.YStride*0xc, 1, d.img.YStride, true) - filter246(d.img.Cb, 8, l, il, hl, cIndex+d.img.CStride*0x4, 1, d.img.CStride, true) - filter246(d.img.Cr, 8, l, il, hl, cIndex+d.img.CStride*0x4, 1, d.img.CStride, true) - } - } - } -} - -// filterParam holds the loop filter parameters for a macroblock. -type filterParam struct { - // The first three fields are thresholds used by the loop filter to smooth - // over the edges and interior of a macroblock. level is used by both the - // simple and normal filters. The inner level and high edge variance level - // are only used by the normal filter. - level, ilevel, hlevel uint8 - // inner is whether the inner loop filter cannot be optimized out as a - // no-op for this particular macroblock. - inner bool -} - -// 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.level = 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.ilevel = uint8(ilevel) - p.level = uint8(2*level + ilevel) - if d.frameHeader.KeyFrame { - if level < 15 { - p.hlevel = 0 - } else if level < 40 { - p.hlevel = 1 - } else { - p.hlevel = 2 - } - } else { - if level < 15 { - p.hlevel = 0 - } else if level < 20 { - p.hlevel = 1 - } else if level < 40 { - p.hlevel = 2 - } else { - p.hlevel = 3 - } - } - } - } -} - -// intSize is either 32 or 64. -const intSize = 32 << (^uint(0) >> 63) - -func abs(x int) int { - // m := -1 if x < 0. m := 0 otherwise. - m := x >> (intSize - 1) - - // In two's complement representation, the negative number - // of any number (except the smallest one) can be computed - // by flipping all the bits and add 1. This is faster than - // code with a branch. - // See Hacker's Delight, section 2-4. - return (x ^ m) - m -} - -func clamp15(x int) int { - if x < -16 { - return -16 - } - if x > 15 { - return 15 - } - return x -} - -func clamp127(x int) int { - if x < -128 { - return -128 - } - if x > 127 { - return 127 - } - return x -} - -func clamp255(x int) uint8 { - if x < 0 { - return 0 - } - if x > 255 { - return 255 - } - return uint8(x) -} diff --git a/vendor/golang.org/x/image/vp8/idct.go b/vendor/golang.org/x/image/vp8/idct.go deleted file mode 100644 index 929af2cc9..000000000 --- a/vendor/golang.org/x/image/vp8/idct.go +++ /dev/null @@ -1,98 +0,0 @@ -// Copyright 2011 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 - -// This file implements the inverse Discrete Cosine Transform and the inverse -// Walsh Hadamard Transform (WHT), as specified in sections 14.3 and 14.4. - -func clip8(i int32) uint8 { - if i < 0 { - return 0 - } - if i > 255 { - return 255 - } - return uint8(i) -} - -func (z *Decoder) inverseDCT4(y, x, coeffBase int) { - const ( - c1 = 85627 // 65536 * cos(pi/8) * sqrt(2). - c2 = 35468 // 65536 * sin(pi/8) * sqrt(2). - ) - var m [4][4]int32 - for i := 0; i < 4; i++ { - a := int32(z.coeff[coeffBase+0]) + int32(z.coeff[coeffBase+8]) - b := int32(z.coeff[coeffBase+0]) - int32(z.coeff[coeffBase+8]) - c := (int32(z.coeff[coeffBase+4])*c2)>>16 - (int32(z.coeff[coeffBase+12])*c1)>>16 - d := (int32(z.coeff[coeffBase+4])*c1)>>16 + (int32(z.coeff[coeffBase+12])*c2)>>16 - m[i][0] = a + d - m[i][1] = b + c - m[i][2] = b - c - m[i][3] = a - d - coeffBase++ - } - for j := 0; j < 4; j++ { - dc := m[0][j] + 4 - a := dc + m[2][j] - b := dc - m[2][j] - c := (m[1][j]*c2)>>16 - (m[3][j]*c1)>>16 - d := (m[1][j]*c1)>>16 + (m[3][j]*c2)>>16 - z.ybr[y+j][x+0] = clip8(int32(z.ybr[y+j][x+0]) + (a+d)>>3) - z.ybr[y+j][x+1] = clip8(int32(z.ybr[y+j][x+1]) + (b+c)>>3) - z.ybr[y+j][x+2] = clip8(int32(z.ybr[y+j][x+2]) + (b-c)>>3) - z.ybr[y+j][x+3] = clip8(int32(z.ybr[y+j][x+3]) + (a-d)>>3) - } -} - -func (z *Decoder) inverseDCT4DCOnly(y, x, coeffBase int) { - dc := (int32(z.coeff[coeffBase+0]) + 4) >> 3 - for j := 0; j < 4; j++ { - for i := 0; i < 4; i++ { - z.ybr[y+j][x+i] = clip8(int32(z.ybr[y+j][x+i]) + dc) - } - } -} - -func (z *Decoder) inverseDCT8(y, x, coeffBase int) { - z.inverseDCT4(y+0, x+0, coeffBase+0*16) - z.inverseDCT4(y+0, x+4, coeffBase+1*16) - z.inverseDCT4(y+4, x+0, coeffBase+2*16) - z.inverseDCT4(y+4, x+4, coeffBase+3*16) -} - -func (z *Decoder) inverseDCT8DCOnly(y, x, coeffBase int) { - z.inverseDCT4DCOnly(y+0, x+0, coeffBase+0*16) - z.inverseDCT4DCOnly(y+0, x+4, coeffBase+1*16) - z.inverseDCT4DCOnly(y+4, x+0, coeffBase+2*16) - z.inverseDCT4DCOnly(y+4, x+4, coeffBase+3*16) -} - -func (d *Decoder) inverseWHT16() { - var m [16]int32 - for i := 0; i < 4; i++ { - a0 := int32(d.coeff[384+0+i]) + int32(d.coeff[384+12+i]) - a1 := int32(d.coeff[384+4+i]) + int32(d.coeff[384+8+i]) - a2 := int32(d.coeff[384+4+i]) - int32(d.coeff[384+8+i]) - a3 := int32(d.coeff[384+0+i]) - int32(d.coeff[384+12+i]) - m[0+i] = a0 + a1 - m[8+i] = a0 - a1 - m[4+i] = a3 + a2 - m[12+i] = a3 - a2 - } - out := 0 - for i := 0; i < 4; i++ { - dc := m[0+i*4] + 3 - a0 := dc + m[3+i*4] - a1 := m[1+i*4] + m[2+i*4] - a2 := m[1+i*4] - m[2+i*4] - a3 := dc - m[3+i*4] - d.coeff[out+0] = int16((a0 + a1) >> 3) - d.coeff[out+16] = int16((a3 + a2) >> 3) - d.coeff[out+32] = int16((a0 - a1) >> 3) - d.coeff[out+48] = int16((a3 - a2) >> 3) - out += 64 - } -} diff --git a/vendor/golang.org/x/image/vp8/partition.go b/vendor/golang.org/x/image/vp8/partition.go deleted file mode 100644 index 72288bdeb..000000000 --- a/vendor/golang.org/x/image/vp8/partition.go +++ /dev/null @@ -1,129 +0,0 @@ -// Copyright 2011 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 - -// Each VP8 frame consists of between 2 and 9 bitstream partitions. -// Each partition is byte-aligned and is independently arithmetic-encoded. -// -// This file implements decoding a partition's bitstream, as specified in -// chapter 7. The implementation follows libwebp's approach instead of the -// specification's reference C implementation. For example, we use a look-up -// table instead of a for loop to recalibrate the encoded range. - -var ( - lutShift = [127]uint8{ - 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, - 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - } - lutRangeM1 = [127]uint8{ - 127, - 127, 191, - 127, 159, 191, 223, - 127, 143, 159, 175, 191, 207, 223, 239, - 127, 135, 143, 151, 159, 167, 175, 183, 191, 199, 207, 215, 223, 231, 239, 247, - 127, 131, 135, 139, 143, 147, 151, 155, 159, 163, 167, 171, 175, 179, 183, 187, - 191, 195, 199, 203, 207, 211, 215, 219, 223, 227, 231, 235, 239, 243, 247, 251, - 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, - 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, - 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, - 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, - } -) - -// uniformProb represents a 50% probability that the next bit is 0. -const uniformProb = 128 - -// partition holds arithmetic-coded bits. -type partition struct { - // buf is the input bytes. - buf []byte - // r is how many of buf's bytes have been consumed. - r int - // rangeM1 is range minus 1, where range is in the arithmetic coding sense, - // not the Go language sense. - rangeM1 uint32 - // bits and nBits hold those bits shifted out of buf but not yet consumed. - bits uint32 - nBits uint8 - // unexpectedEOF tells whether we tried to read past buf. - unexpectedEOF bool -} - -// init initializes the partition. -func (p *partition) init(buf []byte) { - p.buf = buf - p.r = 0 - p.rangeM1 = 254 - p.bits = 0 - p.nBits = 0 - p.unexpectedEOF = false -} - -// readBit returns the next bit. -func (p *partition) readBit(prob uint8) bool { - if p.nBits < 8 { - if p.r >= len(p.buf) { - p.unexpectedEOF = true - return false - } - // Expression split for 386 compiler. - x := uint32(p.buf[p.r]) - p.bits |= x << (8 - p.nBits) - p.r++ - p.nBits += 8 - } - split := (p.rangeM1*uint32(prob))>>8 + 1 - bit := p.bits >= split<<8 - if bit { - p.rangeM1 -= split - p.bits -= split << 8 - } else { - p.rangeM1 = split - 1 - } - if p.rangeM1 < 127 { - shift := lutShift[p.rangeM1] - p.rangeM1 = uint32(lutRangeM1[p.rangeM1]) - p.bits <<= shift - p.nBits -= shift - } - return bit -} - -// readUint returns the next n-bit unsigned integer. -func (p *partition) readUint(prob, n uint8) uint32 { - var u uint32 - for n > 0 { - n-- - if p.readBit(prob) { - u |= 1 << n - } - } - return u -} - -// readInt returns the next n-bit signed integer. -func (p *partition) readInt(prob, n uint8) int32 { - u := p.readUint(prob, n) - b := p.readBit(prob) - if b { - return -int32(u) - } - return int32(u) -} - -// readOptionalInt returns the next n-bit signed integer in an encoding -// where the likely result is zero. -func (p *partition) readOptionalInt(prob, n uint8) int32 { - if !p.readBit(prob) { - return 0 - } - return p.readInt(prob, n) -} diff --git a/vendor/golang.org/x/image/vp8/pred.go b/vendor/golang.org/x/image/vp8/pred.go deleted file mode 100644 index 58c2689ea..000000000 --- a/vendor/golang.org/x/image/vp8/pred.go +++ /dev/null @@ -1,201 +0,0 @@ -// Copyright 2011 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 - -// This file implements parsing the predictor modes, as specified in chapter -// 11. - -func (d *Decoder) parsePredModeY16(mbx int) { - var p uint8 - if !d.fp.readBit(156) { - if !d.fp.readBit(163) { - p = predDC - } else { - p = predVE - } - } else if !d.fp.readBit(128) { - p = predHE - } else { - p = predTM - } - for i := 0; i < 4; i++ { - d.upMB[mbx].pred[i] = p - d.leftMB.pred[i] = p - } - d.predY16 = p -} - -func (d *Decoder) parsePredModeC8() { - if !d.fp.readBit(142) { - d.predC8 = predDC - } else if !d.fp.readBit(114) { - d.predC8 = predVE - } else if !d.fp.readBit(183) { - d.predC8 = predHE - } else { - d.predC8 = predTM - } -} - -func (d *Decoder) parsePredModeY4(mbx int) { - for j := 0; j < 4; j++ { - p := d.leftMB.pred[j] - for i := 0; i < 4; i++ { - prob := &predProb[d.upMB[mbx].pred[i]][p] - if !d.fp.readBit(prob[0]) { - p = predDC - } else if !d.fp.readBit(prob[1]) { - p = predTM - } else if !d.fp.readBit(prob[2]) { - p = predVE - } else if !d.fp.readBit(prob[3]) { - if !d.fp.readBit(prob[4]) { - p = predHE - } else if !d.fp.readBit(prob[5]) { - p = predRD - } else { - p = predVR - } - } else if !d.fp.readBit(prob[6]) { - p = predLD - } else if !d.fp.readBit(prob[7]) { - p = predVL - } else if !d.fp.readBit(prob[8]) { - p = predHD - } else { - p = predHU - } - d.predY4[j][i] = p - d.upMB[mbx].pred[i] = p - } - d.leftMB.pred[j] = p - } -} - -// predProb are the probabilities to decode a 4x4 region's predictor mode given -// the predictor modes of the regions above and left of it. -// These values are specified in section 11.5. -var predProb = [nPred][nPred][9]uint8{ - { - {231, 120, 48, 89, 115, 113, 120, 152, 112}, - {152, 179, 64, 126, 170, 118, 46, 70, 95}, - {175, 69, 143, 80, 85, 82, 72, 155, 103}, - {56, 58, 10, 171, 218, 189, 17, 13, 152}, - {114, 26, 17, 163, 44, 195, 21, 10, 173}, - {121, 24, 80, 195, 26, 62, 44, 64, 85}, - {144, 71, 10, 38, 171, 213, 144, 34, 26}, - {170, 46, 55, 19, 136, 160, 33, 206, 71}, - {63, 20, 8, 114, 114, 208, 12, 9, 226}, - {81, 40, 11, 96, 182, 84, 29, 16, 36}, - }, - { - {134, 183, 89, 137, 98, 101, 106, 165, 148}, - {72, 187, 100, 130, 157, 111, 32, 75, 80}, - {66, 102, 167, 99, 74, 62, 40, 234, 128}, - {41, 53, 9, 178, 241, 141, 26, 8, 107}, - {74, 43, 26, 146, 73, 166, 49, 23, 157}, - {65, 38, 105, 160, 51, 52, 31, 115, 128}, - {104, 79, 12, 27, 217, 255, 87, 17, 7}, - {87, 68, 71, 44, 114, 51, 15, 186, 23}, - {47, 41, 14, 110, 182, 183, 21, 17, 194}, - {66, 45, 25, 102, 197, 189, 23, 18, 22}, - }, - { - {88, 88, 147, 150, 42, 46, 45, 196, 205}, - {43, 97, 183, 117, 85, 38, 35, 179, 61}, - {39, 53, 200, 87, 26, 21, 43, 232, 171}, - {56, 34, 51, 104, 114, 102, 29, 93, 77}, - {39, 28, 85, 171, 58, 165, 90, 98, 64}, - {34, 22, 116, 206, 23, 34, 43, 166, 73}, - {107, 54, 32, 26, 51, 1, 81, 43, 31}, - {68, 25, 106, 22, 64, 171, 36, 225, 114}, - {34, 19, 21, 102, 132, 188, 16, 76, 124}, - {62, 18, 78, 95, 85, 57, 50, 48, 51}, - }, - { - {193, 101, 35, 159, 215, 111, 89, 46, 111}, - {60, 148, 31, 172, 219, 228, 21, 18, 111}, - {112, 113, 77, 85, 179, 255, 38, 120, 114}, - {40, 42, 1, 196, 245, 209, 10, 25, 109}, - {88, 43, 29, 140, 166, 213, 37, 43, 154}, - {61, 63, 30, 155, 67, 45, 68, 1, 209}, - {100, 80, 8, 43, 154, 1, 51, 26, 71}, - {142, 78, 78, 16, 255, 128, 34, 197, 171}, - {41, 40, 5, 102, 211, 183, 4, 1, 221}, - {51, 50, 17, 168, 209, 192, 23, 25, 82}, - }, - { - {138, 31, 36, 171, 27, 166, 38, 44, 229}, - {67, 87, 58, 169, 82, 115, 26, 59, 179}, - {63, 59, 90, 180, 59, 166, 93, 73, 154}, - {40, 40, 21, 116, 143, 209, 34, 39, 175}, - {47, 15, 16, 183, 34, 223, 49, 45, 183}, - {46, 17, 33, 183, 6, 98, 15, 32, 183}, - {57, 46, 22, 24, 128, 1, 54, 17, 37}, - {65, 32, 73, 115, 28, 128, 23, 128, 205}, - {40, 3, 9, 115, 51, 192, 18, 6, 223}, - {87, 37, 9, 115, 59, 77, 64, 21, 47}, - }, - { - {104, 55, 44, 218, 9, 54, 53, 130, 226}, - {64, 90, 70, 205, 40, 41, 23, 26, 57}, - {54, 57, 112, 184, 5, 41, 38, 166, 213}, - {30, 34, 26, 133, 152, 116, 10, 32, 134}, - {39, 19, 53, 221, 26, 114, 32, 73, 255}, - {31, 9, 65, 234, 2, 15, 1, 118, 73}, - {75, 32, 12, 51, 192, 255, 160, 43, 51}, - {88, 31, 35, 67, 102, 85, 55, 186, 85}, - {56, 21, 23, 111, 59, 205, 45, 37, 192}, - {55, 38, 70, 124, 73, 102, 1, 34, 98}, - }, - { - {125, 98, 42, 88, 104, 85, 117, 175, 82}, - {95, 84, 53, 89, 128, 100, 113, 101, 45}, - {75, 79, 123, 47, 51, 128, 81, 171, 1}, - {57, 17, 5, 71, 102, 57, 53, 41, 49}, - {38, 33, 13, 121, 57, 73, 26, 1, 85}, - {41, 10, 67, 138, 77, 110, 90, 47, 114}, - {115, 21, 2, 10, 102, 255, 166, 23, 6}, - {101, 29, 16, 10, 85, 128, 101, 196, 26}, - {57, 18, 10, 102, 102, 213, 34, 20, 43}, - {117, 20, 15, 36, 163, 128, 68, 1, 26}, - }, - { - {102, 61, 71, 37, 34, 53, 31, 243, 192}, - {69, 60, 71, 38, 73, 119, 28, 222, 37}, - {68, 45, 128, 34, 1, 47, 11, 245, 171}, - {62, 17, 19, 70, 146, 85, 55, 62, 70}, - {37, 43, 37, 154, 100, 163, 85, 160, 1}, - {63, 9, 92, 136, 28, 64, 32, 201, 85}, - {75, 15, 9, 9, 64, 255, 184, 119, 16}, - {86, 6, 28, 5, 64, 255, 25, 248, 1}, - {56, 8, 17, 132, 137, 255, 55, 116, 128}, - {58, 15, 20, 82, 135, 57, 26, 121, 40}, - }, - { - {164, 50, 31, 137, 154, 133, 25, 35, 218}, - {51, 103, 44, 131, 131, 123, 31, 6, 158}, - {86, 40, 64, 135, 148, 224, 45, 183, 128}, - {22, 26, 17, 131, 240, 154, 14, 1, 209}, - {45, 16, 21, 91, 64, 222, 7, 1, 197}, - {56, 21, 39, 155, 60, 138, 23, 102, 213}, - {83, 12, 13, 54, 192, 255, 68, 47, 28}, - {85, 26, 85, 85, 128, 128, 32, 146, 171}, - {18, 11, 7, 63, 144, 171, 4, 4, 246}, - {35, 27, 10, 146, 174, 171, 12, 26, 128}, - }, - { - {190, 80, 35, 99, 180, 80, 126, 54, 45}, - {85, 126, 47, 87, 176, 51, 41, 20, 32}, - {101, 75, 128, 139, 118, 146, 116, 128, 85}, - {56, 41, 15, 176, 236, 85, 37, 9, 62}, - {71, 30, 17, 119, 118, 255, 17, 18, 138}, - {101, 38, 60, 138, 55, 70, 43, 26, 142}, - {146, 36, 19, 30, 171, 255, 97, 27, 20}, - {138, 45, 61, 62, 219, 1, 81, 188, 64}, - {32, 41, 20, 117, 151, 142, 20, 21, 163}, - {112, 19, 12, 61, 195, 128, 48, 4, 24}, - }, -} diff --git a/vendor/golang.org/x/image/vp8/predfunc.go b/vendor/golang.org/x/image/vp8/predfunc.go deleted file mode 100644 index f8999582b..000000000 --- a/vendor/golang.org/x/image/vp8/predfunc.go +++ /dev/null @@ -1,553 +0,0 @@ -// Copyright 2011 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 - -// This file implements the predicition functions, as specified in chapter 12. -// -// For each macroblock (of 1x16x16 luma and 2x8x8 chroma coefficients), the -// luma values are either predicted as one large 16x16 region or 16 separate -// 4x4 regions. The chroma values are always predicted as one 8x8 region. -// -// For 4x4 regions, the target block's predicted values (Xs) are a function of -// its previously-decoded top and left border values, as well as a number of -// pixels from the top-right: -// -// a b c d e f g h -// p X X X X -// q X X X X -// r X X X X -// s X X X X -// -// The predictor modes are: -// - DC: all Xs = (b + c + d + e + p + q + r + s + 4) / 8. -// - TM: the first X = (b + p - a), the second X = (c + p - a), and so on. -// - VE: each X = the weighted average of its column's top value and that -// value's neighbors, i.e. averages of abc, bcd, cde or def. -// - HE: similar to VE except rows instead of columns, and the final row is -// an average of r, s and s. -// - RD, VR, LD, VL, HD, HU: these diagonal modes ("Right Down", "Vertical -// Right", etc) are more complicated and are described in section 12.3. -// All Xs are clipped to the range [0, 255]. -// -// For 8x8 and 16x16 regions, the target block's predicted values are a -// function of the top and left border values without the top-right overhang, -// i.e. without the 8x8 or 16x16 equivalent of f, g and h. Furthermore: -// - There are no diagonal predictor modes, only DC, TM, VE and HE. -// - The DC mode has variants for macroblocks in the top row and/or left -// column, i.e. for macroblocks with mby == 0 || mbx == 0. -// - The VE and HE modes take only the column top or row left values; they do -// not smooth that top/left value with its neighbors. - -// nPred is the number of predictor modes, not including the Top/Left versions -// of the DC predictor mode. -const nPred = 10 - -const ( - predDC = iota - predTM - predVE - predHE - predRD - predVR - predLD - predVL - predHD - predHU - predDCTop - predDCLeft - predDCTopLeft -) - -func checkTopLeftPred(mbx, mby int, p uint8) uint8 { - if p != predDC { - return p - } - if mbx == 0 { - if mby == 0 { - return predDCTopLeft - } - return predDCLeft - } - if mby == 0 { - return predDCTop - } - return predDC -} - -var predFunc4 = [...]func(*Decoder, int, int){ - predFunc4DC, - predFunc4TM, - predFunc4VE, - predFunc4HE, - predFunc4RD, - predFunc4VR, - predFunc4LD, - predFunc4VL, - predFunc4HD, - predFunc4HU, - nil, - nil, - nil, -} - -var predFunc8 = [...]func(*Decoder, int, int){ - predFunc8DC, - predFunc8TM, - predFunc8VE, - predFunc8HE, - nil, - nil, - nil, - nil, - nil, - nil, - predFunc8DCTop, - predFunc8DCLeft, - predFunc8DCTopLeft, -} - -var predFunc16 = [...]func(*Decoder, int, int){ - predFunc16DC, - predFunc16TM, - predFunc16VE, - predFunc16HE, - nil, - nil, - nil, - nil, - nil, - nil, - predFunc16DCTop, - predFunc16DCLeft, - predFunc16DCTopLeft, -} - -func predFunc4DC(z *Decoder, y, x int) { - sum := uint32(4) - for i := 0; i < 4; i++ { - sum += uint32(z.ybr[y-1][x+i]) - } - for j := 0; j < 4; j++ { - sum += uint32(z.ybr[y+j][x-1]) - } - avg := uint8(sum / 8) - for j := 0; j < 4; j++ { - for i := 0; i < 4; i++ { - z.ybr[y+j][x+i] = avg - } - } -} - -func predFunc4TM(z *Decoder, y, x int) { - delta0 := -int32(z.ybr[y-1][x-1]) - for j := 0; j < 4; j++ { - delta1 := delta0 + int32(z.ybr[y+j][x-1]) - for i := 0; i < 4; i++ { - delta2 := delta1 + int32(z.ybr[y-1][x+i]) - z.ybr[y+j][x+i] = uint8(clip(delta2, 0, 255)) - } - } -} - -func predFunc4VE(z *Decoder, y, x int) { - a := int32(z.ybr[y-1][x-1]) - b := int32(z.ybr[y-1][x+0]) - c := int32(z.ybr[y-1][x+1]) - d := int32(z.ybr[y-1][x+2]) - e := int32(z.ybr[y-1][x+3]) - f := int32(z.ybr[y-1][x+4]) - abc := uint8((a + 2*b + c + 2) / 4) - bcd := uint8((b + 2*c + d + 2) / 4) - cde := uint8((c + 2*d + e + 2) / 4) - def := uint8((d + 2*e + f + 2) / 4) - for j := 0; j < 4; j++ { - z.ybr[y+j][x+0] = abc - z.ybr[y+j][x+1] = bcd - z.ybr[y+j][x+2] = cde - z.ybr[y+j][x+3] = def - } -} - -func predFunc4HE(z *Decoder, y, x int) { - s := int32(z.ybr[y+3][x-1]) - r := int32(z.ybr[y+2][x-1]) - q := int32(z.ybr[y+1][x-1]) - p := int32(z.ybr[y+0][x-1]) - a := int32(z.ybr[y-1][x-1]) - ssr := uint8((s + 2*s + r + 2) / 4) - srq := uint8((s + 2*r + q + 2) / 4) - rqp := uint8((r + 2*q + p + 2) / 4) - apq := uint8((a + 2*p + q + 2) / 4) - for i := 0; i < 4; i++ { - z.ybr[y+0][x+i] = apq - z.ybr[y+1][x+i] = rqp - z.ybr[y+2][x+i] = srq - z.ybr[y+3][x+i] = ssr - } -} - -func predFunc4RD(z *Decoder, y, x int) { - s := int32(z.ybr[y+3][x-1]) - r := int32(z.ybr[y+2][x-1]) - q := int32(z.ybr[y+1][x-1]) - p := int32(z.ybr[y+0][x-1]) - a := int32(z.ybr[y-1][x-1]) - b := int32(z.ybr[y-1][x+0]) - c := int32(z.ybr[y-1][x+1]) - d := int32(z.ybr[y-1][x+2]) - e := int32(z.ybr[y-1][x+3]) - srq := uint8((s + 2*r + q + 2) / 4) - rqp := uint8((r + 2*q + p + 2) / 4) - qpa := uint8((q + 2*p + a + 2) / 4) - pab := uint8((p + 2*a + b + 2) / 4) - abc := uint8((a + 2*b + c + 2) / 4) - bcd := uint8((b + 2*c + d + 2) / 4) - cde := uint8((c + 2*d + e + 2) / 4) - z.ybr[y+0][x+0] = pab - z.ybr[y+0][x+1] = abc - z.ybr[y+0][x+2] = bcd - z.ybr[y+0][x+3] = cde - z.ybr[y+1][x+0] = qpa - z.ybr[y+1][x+1] = pab - z.ybr[y+1][x+2] = abc - z.ybr[y+1][x+3] = bcd - z.ybr[y+2][x+0] = rqp - z.ybr[y+2][x+1] = qpa - z.ybr[y+2][x+2] = pab - z.ybr[y+2][x+3] = abc - z.ybr[y+3][x+0] = srq - z.ybr[y+3][x+1] = rqp - z.ybr[y+3][x+2] = qpa - z.ybr[y+3][x+3] = pab -} - -func predFunc4VR(z *Decoder, y, x int) { - r := int32(z.ybr[y+2][x-1]) - q := int32(z.ybr[y+1][x-1]) - p := int32(z.ybr[y+0][x-1]) - a := int32(z.ybr[y-1][x-1]) - b := int32(z.ybr[y-1][x+0]) - c := int32(z.ybr[y-1][x+1]) - d := int32(z.ybr[y-1][x+2]) - e := int32(z.ybr[y-1][x+3]) - ab := uint8((a + b + 1) / 2) - bc := uint8((b + c + 1) / 2) - cd := uint8((c + d + 1) / 2) - de := uint8((d + e + 1) / 2) - rqp := uint8((r + 2*q + p + 2) / 4) - qpa := uint8((q + 2*p + a + 2) / 4) - pab := uint8((p + 2*a + b + 2) / 4) - abc := uint8((a + 2*b + c + 2) / 4) - bcd := uint8((b + 2*c + d + 2) / 4) - cde := uint8((c + 2*d + e + 2) / 4) - z.ybr[y+0][x+0] = ab - z.ybr[y+0][x+1] = bc - z.ybr[y+0][x+2] = cd - z.ybr[y+0][x+3] = de - z.ybr[y+1][x+0] = pab - z.ybr[y+1][x+1] = abc - z.ybr[y+1][x+2] = bcd - z.ybr[y+1][x+3] = cde - z.ybr[y+2][x+0] = qpa - z.ybr[y+2][x+1] = ab - z.ybr[y+2][x+2] = bc - z.ybr[y+2][x+3] = cd - z.ybr[y+3][x+0] = rqp - z.ybr[y+3][x+1] = pab - z.ybr[y+3][x+2] = abc - z.ybr[y+3][x+3] = bcd -} - -func predFunc4LD(z *Decoder, y, x int) { - a := int32(z.ybr[y-1][x+0]) - b := int32(z.ybr[y-1][x+1]) - c := int32(z.ybr[y-1][x+2]) - d := int32(z.ybr[y-1][x+3]) - e := int32(z.ybr[y-1][x+4]) - f := int32(z.ybr[y-1][x+5]) - g := int32(z.ybr[y-1][x+6]) - h := int32(z.ybr[y-1][x+7]) - abc := uint8((a + 2*b + c + 2) / 4) - bcd := uint8((b + 2*c + d + 2) / 4) - cde := uint8((c + 2*d + e + 2) / 4) - def := uint8((d + 2*e + f + 2) / 4) - efg := uint8((e + 2*f + g + 2) / 4) - fgh := uint8((f + 2*g + h + 2) / 4) - ghh := uint8((g + 2*h + h + 2) / 4) - z.ybr[y+0][x+0] = abc - z.ybr[y+0][x+1] = bcd - z.ybr[y+0][x+2] = cde - z.ybr[y+0][x+3] = def - z.ybr[y+1][x+0] = bcd - z.ybr[y+1][x+1] = cde - z.ybr[y+1][x+2] = def - z.ybr[y+1][x+3] = efg - z.ybr[y+2][x+0] = cde - z.ybr[y+2][x+1] = def - z.ybr[y+2][x+2] = efg - z.ybr[y+2][x+3] = fgh - z.ybr[y+3][x+0] = def - z.ybr[y+3][x+1] = efg - z.ybr[y+3][x+2] = fgh - z.ybr[y+3][x+3] = ghh -} - -func predFunc4VL(z *Decoder, y, x int) { - a := int32(z.ybr[y-1][x+0]) - b := int32(z.ybr[y-1][x+1]) - c := int32(z.ybr[y-1][x+2]) - d := int32(z.ybr[y-1][x+3]) - e := int32(z.ybr[y-1][x+4]) - f := int32(z.ybr[y-1][x+5]) - g := int32(z.ybr[y-1][x+6]) - h := int32(z.ybr[y-1][x+7]) - ab := uint8((a + b + 1) / 2) - bc := uint8((b + c + 1) / 2) - cd := uint8((c + d + 1) / 2) - de := uint8((d + e + 1) / 2) - abc := uint8((a + 2*b + c + 2) / 4) - bcd := uint8((b + 2*c + d + 2) / 4) - cde := uint8((c + 2*d + e + 2) / 4) - def := uint8((d + 2*e + f + 2) / 4) - efg := uint8((e + 2*f + g + 2) / 4) - fgh := uint8((f + 2*g + h + 2) / 4) - z.ybr[y+0][x+0] = ab - z.ybr[y+0][x+1] = bc - z.ybr[y+0][x+2] = cd - z.ybr[y+0][x+3] = de - z.ybr[y+1][x+0] = abc - z.ybr[y+1][x+1] = bcd - z.ybr[y+1][x+2] = cde - z.ybr[y+1][x+3] = def - z.ybr[y+2][x+0] = bc - z.ybr[y+2][x+1] = cd - z.ybr[y+2][x+2] = de - z.ybr[y+2][x+3] = efg - z.ybr[y+3][x+0] = bcd - z.ybr[y+3][x+1] = cde - z.ybr[y+3][x+2] = def - z.ybr[y+3][x+3] = fgh -} - -func predFunc4HD(z *Decoder, y, x int) { - s := int32(z.ybr[y+3][x-1]) - r := int32(z.ybr[y+2][x-1]) - q := int32(z.ybr[y+1][x-1]) - p := int32(z.ybr[y+0][x-1]) - a := int32(z.ybr[y-1][x-1]) - b := int32(z.ybr[y-1][x+0]) - c := int32(z.ybr[y-1][x+1]) - d := int32(z.ybr[y-1][x+2]) - sr := uint8((s + r + 1) / 2) - rq := uint8((r + q + 1) / 2) - qp := uint8((q + p + 1) / 2) - pa := uint8((p + a + 1) / 2) - srq := uint8((s + 2*r + q + 2) / 4) - rqp := uint8((r + 2*q + p + 2) / 4) - qpa := uint8((q + 2*p + a + 2) / 4) - pab := uint8((p + 2*a + b + 2) / 4) - abc := uint8((a + 2*b + c + 2) / 4) - bcd := uint8((b + 2*c + d + 2) / 4) - z.ybr[y+0][x+0] = pa - z.ybr[y+0][x+1] = pab - z.ybr[y+0][x+2] = abc - z.ybr[y+0][x+3] = bcd - z.ybr[y+1][x+0] = qp - z.ybr[y+1][x+1] = qpa - z.ybr[y+1][x+2] = pa - z.ybr[y+1][x+3] = pab - z.ybr[y+2][x+0] = rq - z.ybr[y+2][x+1] = rqp - z.ybr[y+2][x+2] = qp - z.ybr[y+2][x+3] = qpa - z.ybr[y+3][x+0] = sr - z.ybr[y+3][x+1] = srq - z.ybr[y+3][x+2] = rq - z.ybr[y+3][x+3] = rqp -} - -func predFunc4HU(z *Decoder, y, x int) { - s := int32(z.ybr[y+3][x-1]) - r := int32(z.ybr[y+2][x-1]) - q := int32(z.ybr[y+1][x-1]) - p := int32(z.ybr[y+0][x-1]) - pq := uint8((p + q + 1) / 2) - qr := uint8((q + r + 1) / 2) - rs := uint8((r + s + 1) / 2) - pqr := uint8((p + 2*q + r + 2) / 4) - qrs := uint8((q + 2*r + s + 2) / 4) - rss := uint8((r + 2*s + s + 2) / 4) - sss := uint8(s) - z.ybr[y+0][x+0] = pq - z.ybr[y+0][x+1] = pqr - z.ybr[y+0][x+2] = qr - z.ybr[y+0][x+3] = qrs - z.ybr[y+1][x+0] = qr - z.ybr[y+1][x+1] = qrs - z.ybr[y+1][x+2] = rs - z.ybr[y+1][x+3] = rss - z.ybr[y+2][x+0] = rs - z.ybr[y+2][x+1] = rss - z.ybr[y+2][x+2] = sss - z.ybr[y+2][x+3] = sss - z.ybr[y+3][x+0] = sss - z.ybr[y+3][x+1] = sss - z.ybr[y+3][x+2] = sss - z.ybr[y+3][x+3] = sss -} - -func predFunc8DC(z *Decoder, y, x int) { - sum := uint32(8) - for i := 0; i < 8; i++ { - sum += uint32(z.ybr[y-1][x+i]) - } - for j := 0; j < 8; j++ { - sum += uint32(z.ybr[y+j][x-1]) - } - avg := uint8(sum / 16) - for j := 0; j < 8; j++ { - for i := 0; i < 8; i++ { - z.ybr[y+j][x+i] = avg - } - } -} - -func predFunc8TM(z *Decoder, y, x int) { - delta0 := -int32(z.ybr[y-1][x-1]) - for j := 0; j < 8; j++ { - delta1 := delta0 + int32(z.ybr[y+j][x-1]) - for i := 0; i < 8; i++ { - delta2 := delta1 + int32(z.ybr[y-1][x+i]) - z.ybr[y+j][x+i] = uint8(clip(delta2, 0, 255)) - } - } -} - -func predFunc8VE(z *Decoder, y, x int) { - for j := 0; j < 8; j++ { - for i := 0; i < 8; i++ { - z.ybr[y+j][x+i] = z.ybr[y-1][x+i] - } - } -} - -func predFunc8HE(z *Decoder, y, x int) { - for j := 0; j < 8; j++ { - for i := 0; i < 8; i++ { - z.ybr[y+j][x+i] = z.ybr[y+j][x-1] - } - } -} - -func predFunc8DCTop(z *Decoder, y, x int) { - sum := uint32(4) - for j := 0; j < 8; j++ { - sum += uint32(z.ybr[y+j][x-1]) - } - avg := uint8(sum / 8) - for j := 0; j < 8; j++ { - for i := 0; i < 8; i++ { - z.ybr[y+j][x+i] = avg - } - } -} - -func predFunc8DCLeft(z *Decoder, y, x int) { - sum := uint32(4) - for i := 0; i < 8; i++ { - sum += uint32(z.ybr[y-1][x+i]) - } - avg := uint8(sum / 8) - for j := 0; j < 8; j++ { - for i := 0; i < 8; i++ { - z.ybr[y+j][x+i] = avg - } - } -} - -func predFunc8DCTopLeft(z *Decoder, y, x int) { - for j := 0; j < 8; j++ { - for i := 0; i < 8; i++ { - z.ybr[y+j][x+i] = 0x80 - } - } -} - -func predFunc16DC(z *Decoder, y, x int) { - sum := uint32(16) - for i := 0; i < 16; i++ { - sum += uint32(z.ybr[y-1][x+i]) - } - for j := 0; j < 16; j++ { - sum += uint32(z.ybr[y+j][x-1]) - } - avg := uint8(sum / 32) - for j := 0; j < 16; j++ { - for i := 0; i < 16; i++ { - z.ybr[y+j][x+i] = avg - } - } -} - -func predFunc16TM(z *Decoder, y, x int) { - delta0 := -int32(z.ybr[y-1][x-1]) - for j := 0; j < 16; j++ { - delta1 := delta0 + int32(z.ybr[y+j][x-1]) - for i := 0; i < 16; i++ { - delta2 := delta1 + int32(z.ybr[y-1][x+i]) - z.ybr[y+j][x+i] = uint8(clip(delta2, 0, 255)) - } - } -} - -func predFunc16VE(z *Decoder, y, x int) { - for j := 0; j < 16; j++ { - for i := 0; i < 16; i++ { - z.ybr[y+j][x+i] = z.ybr[y-1][x+i] - } - } -} - -func predFunc16HE(z *Decoder, y, x int) { - for j := 0; j < 16; j++ { - for i := 0; i < 16; i++ { - z.ybr[y+j][x+i] = z.ybr[y+j][x-1] - } - } -} - -func predFunc16DCTop(z *Decoder, y, x int) { - sum := uint32(8) - for j := 0; j < 16; j++ { - sum += uint32(z.ybr[y+j][x-1]) - } - avg := uint8(sum / 16) - for j := 0; j < 16; j++ { - for i := 0; i < 16; i++ { - z.ybr[y+j][x+i] = avg - } - } -} - -func predFunc16DCLeft(z *Decoder, y, x int) { - sum := uint32(8) - for i := 0; i < 16; i++ { - sum += uint32(z.ybr[y-1][x+i]) - } - avg := uint8(sum / 16) - for j := 0; j < 16; j++ { - for i := 0; i < 16; i++ { - z.ybr[y+j][x+i] = avg - } - } -} - -func predFunc16DCTopLeft(z *Decoder, y, x int) { - for j := 0; j < 16; j++ { - for i := 0; i < 16; i++ { - z.ybr[y+j][x+i] = 0x80 - } - } -} diff --git a/vendor/golang.org/x/image/vp8/quant.go b/vendor/golang.org/x/image/vp8/quant.go deleted file mode 100644 index da4361604..000000000 --- a/vendor/golang.org/x/image/vp8/quant.go +++ /dev/null @@ -1,98 +0,0 @@ -// Copyright 2011 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 - -// This file implements parsing the quantization factors. - -// quant are DC/AC quantization factors. -type quant struct { - y1 [2]uint16 - y2 [2]uint16 - uv [2]uint16 -} - -// clip clips x to the range [min, max] inclusive. -func clip(x, min, max int32) int32 { - if x < min { - return min - } - if x > max { - return max - } - return x -} - -// parseQuant parses the quantization factors, as specified in section 9.6. -func (d *Decoder) parseQuant() { - baseQ0 := d.fp.readUint(uniformProb, 7) - dqy1DC := d.fp.readOptionalInt(uniformProb, 4) - const dqy1AC = 0 - dqy2DC := d.fp.readOptionalInt(uniformProb, 4) - dqy2AC := d.fp.readOptionalInt(uniformProb, 4) - dquvDC := d.fp.readOptionalInt(uniformProb, 4) - dquvAC := d.fp.readOptionalInt(uniformProb, 4) - for i := 0; i < nSegment; i++ { - q := int32(baseQ0) - if d.segmentHeader.useSegment { - if d.segmentHeader.relativeDelta { - q += int32(d.segmentHeader.quantizer[i]) - } else { - q = int32(d.segmentHeader.quantizer[i]) - } - } - d.quant[i].y1[0] = dequantTableDC[clip(q+dqy1DC, 0, 127)] - d.quant[i].y1[1] = dequantTableAC[clip(q+dqy1AC, 0, 127)] - d.quant[i].y2[0] = dequantTableDC[clip(q+dqy2DC, 0, 127)] * 2 - d.quant[i].y2[1] = dequantTableAC[clip(q+dqy2AC, 0, 127)] * 155 / 100 - if d.quant[i].y2[1] < 8 { - d.quant[i].y2[1] = 8 - } - // The 117 is not a typo. The dequant_init function in the spec's Reference - // Decoder Source Code (http://tools.ietf.org/html/rfc6386#section-9.6 Page 145) - // says to clamp the LHS value at 132, which is equal to dequantTableDC[117]. - d.quant[i].uv[0] = dequantTableDC[clip(q+dquvDC, 0, 117)] - d.quant[i].uv[1] = dequantTableAC[clip(q+dquvAC, 0, 127)] - } -} - -// The dequantization tables are specified in section 14.1. -var ( - dequantTableDC = [128]uint16{ - 4, 5, 6, 7, 8, 9, 10, 10, - 11, 12, 13, 14, 15, 16, 17, 17, - 18, 19, 20, 20, 21, 21, 22, 22, - 23, 23, 24, 25, 25, 26, 27, 28, - 29, 30, 31, 32, 33, 34, 35, 36, - 37, 37, 38, 39, 40, 41, 42, 43, - 44, 45, 46, 46, 47, 48, 49, 50, - 51, 52, 53, 54, 55, 56, 57, 58, - 59, 60, 61, 62, 63, 64, 65, 66, - 67, 68, 69, 70, 71, 72, 73, 74, - 75, 76, 76, 77, 78, 79, 80, 81, - 82, 83, 84, 85, 86, 87, 88, 89, - 91, 93, 95, 96, 98, 100, 101, 102, - 104, 106, 108, 110, 112, 114, 116, 118, - 122, 124, 126, 128, 130, 132, 134, 136, - 138, 140, 143, 145, 148, 151, 154, 157, - } - dequantTableAC = [128]uint16{ - 4, 5, 6, 7, 8, 9, 10, 11, - 12, 13, 14, 15, 16, 17, 18, 19, - 20, 21, 22, 23, 24, 25, 26, 27, - 28, 29, 30, 31, 32, 33, 34, 35, - 36, 37, 38, 39, 40, 41, 42, 43, - 44, 45, 46, 47, 48, 49, 50, 51, - 52, 53, 54, 55, 56, 57, 58, 60, - 62, 64, 66, 68, 70, 72, 74, 76, - 78, 80, 82, 84, 86, 88, 90, 92, - 94, 96, 98, 100, 102, 104, 106, 108, - 110, 112, 114, 116, 119, 122, 125, 128, - 131, 134, 137, 140, 143, 146, 149, 152, - 155, 158, 161, 164, 167, 170, 173, 177, - 181, 185, 189, 193, 197, 201, 205, 209, - 213, 217, 221, 225, 229, 234, 239, 245, - 249, 254, 259, 264, 269, 274, 279, 284, - } -) diff --git a/vendor/golang.org/x/image/vp8/reconstruct.go b/vendor/golang.org/x/image/vp8/reconstruct.go deleted file mode 100644 index c1cc4b532..000000000 --- a/vendor/golang.org/x/image/vp8/reconstruct.go +++ /dev/null @@ -1,442 +0,0 @@ -// Copyright 2011 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 - -// This file implements decoding DCT/WHT residual coefficients and -// reconstructing YCbCr data equal to predicted values plus residuals. -// -// There are 1*16*16 + 2*8*8 + 1*4*4 coefficients per macroblock: -// - 1*16*16 luma DCT coefficients, -// - 2*8*8 chroma DCT coefficients, and -// - 1*4*4 luma WHT coefficients. -// Coefficients are read in lots of 16, and the later coefficients in each lot -// are often zero. -// -// The YCbCr data consists of 1*16*16 luma values and 2*8*8 chroma values, -// plus previously decoded values along the top and left borders. The combined -// values are laid out as a [1+16+1+8][32]uint8 so that vertically adjacent -// samples are 32 bytes apart. In detail, the layout is: -// -// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 -// . . . . . . . a b b b b b b b b b b b b b b b b c c c c . . . . 0 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 1 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 2 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 3 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y c c c c . . . . 4 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 5 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 6 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 7 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y c c c c . . . . 8 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 9 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 10 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 11 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y c c c c . . . . 12 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 13 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 14 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 15 -// . . . . . . . d Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y . . . . . . . . 16 -// . . . . . . . e f f f f f f f f . . . . . . . g h h h h h h h h 17 -// . . . . . . . i B B B B B B B B . . . . . . . j R R R R R R R R 18 -// . . . . . . . i B B B B B B B B . . . . . . . j R R R R R R R R 19 -// . . . . . . . i B B B B B B B B . . . . . . . j R R R R R R R R 20 -// . . . . . . . i B B B B B B B B . . . . . . . j R R R R R R R R 21 -// . . . . . . . i B B B B B B B B . . . . . . . j R R R R R R R R 22 -// . . . . . . . i B B B B B B B B . . . . . . . j R R R R R R R R 23 -// . . . . . . . i B B B B B B B B . . . . . . . j R R R R R R R R 24 -// . . . . . . . i B B B B B B B B . . . . . . . j R R R R R R R R 25 -// -// Y, B and R are the reconstructed luma (Y) and chroma (B, R) values. -// The Y values are predicted (either as one 16x16 region or 16 4x4 regions) -// based on the row above's Y values (some combination of {abc} or {dYC}) and -// the column left's Y values (either {ad} or {bY}). Similarly, B and R values -// are predicted on the row above and column left of their respective 8x8 -// region: {efi} for B, {ghj} for R. -// -// For uppermost macroblocks (i.e. those with mby == 0), the {abcefgh} values -// are initialized to 0x81. Otherwise, they are copied from the bottom row of -// the macroblock above. The {c} values are then duplicated from row 0 to rows -// 4, 8 and 12 of the ybr workspace. -// Similarly, for leftmost macroblocks (i.e. those with mbx == 0), the {adeigj} -// values are initialized to 0x7f. Otherwise, they are copied from the right -// column of the macroblock to the left. -// For the top-left macroblock (with mby == 0 && mbx == 0), {aeg} is 0x81. -// -// When moving from one macroblock to the next horizontally, the {adeigj} -// values can simply be copied from the workspace to itself, shifted by 8 or -// 16 columns. When moving from one macroblock to the next vertically, -// filtering can occur and hence the row values have to be copied from the -// post-filtered image instead of the pre-filtered workspace. - -const ( - bCoeffBase = 1*16*16 + 0*8*8 - rCoeffBase = 1*16*16 + 1*8*8 - whtCoeffBase = 1*16*16 + 2*8*8 -) - -const ( - ybrYX = 8 - ybrYY = 1 - ybrBX = 8 - ybrBY = 18 - ybrRX = 24 - ybrRY = 18 -) - -// prepareYBR prepares the {abcdefghij} elements of ybr. -func (d *Decoder) prepareYBR(mbx, mby int) { - if mbx == 0 { - for y := 0; y < 17; y++ { - d.ybr[y][7] = 0x81 - } - for y := 17; y < 26; y++ { - d.ybr[y][7] = 0x81 - d.ybr[y][23] = 0x81 - } - } else { - for y := 0; y < 17; y++ { - d.ybr[y][7] = d.ybr[y][7+16] - } - for y := 17; y < 26; y++ { - d.ybr[y][7] = d.ybr[y][15] - d.ybr[y][23] = d.ybr[y][31] - } - } - if mby == 0 { - for x := 7; x < 28; x++ { - d.ybr[0][x] = 0x7f - } - for x := 7; x < 16; x++ { - d.ybr[17][x] = 0x7f - } - for x := 23; x < 32; x++ { - d.ybr[17][x] = 0x7f - } - } else { - for i := 0; i < 16; i++ { - d.ybr[0][8+i] = d.img.Y[(16*mby-1)*d.img.YStride+16*mbx+i] - } - for i := 0; i < 8; i++ { - d.ybr[17][8+i] = d.img.Cb[(8*mby-1)*d.img.CStride+8*mbx+i] - } - for i := 0; i < 8; i++ { - d.ybr[17][24+i] = d.img.Cr[(8*mby-1)*d.img.CStride+8*mbx+i] - } - if mbx == d.mbw-1 { - for i := 16; i < 20; i++ { - d.ybr[0][8+i] = d.img.Y[(16*mby-1)*d.img.YStride+16*mbx+15] - } - } else { - for i := 16; i < 20; i++ { - d.ybr[0][8+i] = d.img.Y[(16*mby-1)*d.img.YStride+16*mbx+i] - } - } - } - for y := 4; y < 16; y += 4 { - d.ybr[y][24] = d.ybr[0][24] - d.ybr[y][25] = d.ybr[0][25] - d.ybr[y][26] = d.ybr[0][26] - d.ybr[y][27] = d.ybr[0][27] - } -} - -// btou converts a bool to a 0/1 value. -func btou(b bool) uint8 { - if b { - return 1 - } - return 0 -} - -// pack packs four 0/1 values into four bits of a uint32. -func pack(x [4]uint8, shift int) uint32 { - u := uint32(x[0])<<0 | uint32(x[1])<<1 | uint32(x[2])<<2 | uint32(x[3])<<3 - return u << uint(shift) -} - -// unpack unpacks four 0/1 values from a four-bit value. -var unpack = [16][4]uint8{ - {0, 0, 0, 0}, - {1, 0, 0, 0}, - {0, 1, 0, 0}, - {1, 1, 0, 0}, - {0, 0, 1, 0}, - {1, 0, 1, 0}, - {0, 1, 1, 0}, - {1, 1, 1, 0}, - {0, 0, 0, 1}, - {1, 0, 0, 1}, - {0, 1, 0, 1}, - {1, 1, 0, 1}, - {0, 0, 1, 1}, - {1, 0, 1, 1}, - {0, 1, 1, 1}, - {1, 1, 1, 1}, -} - -var ( - // The mapping from 4x4 region position to band is specified in section 13.3. - bands = [17]uint8{0, 1, 2, 3, 6, 4, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7, 0} - // Category probabilties are specified in section 13.2. - // Decoding categories 1 and 2 are done inline. - cat3456 = [4][12]uint8{ - {173, 148, 140, 0, 0, 0, 0, 0, 0, 0, 0, 0}, - {176, 155, 140, 135, 0, 0, 0, 0, 0, 0, 0, 0}, - {180, 157, 141, 134, 130, 0, 0, 0, 0, 0, 0, 0}, - {254, 254, 243, 230, 196, 177, 153, 140, 133, 130, 129, 0}, - } - // The zigzag order is: - // 0 1 5 6 - // 2 4 7 12 - // 3 8 11 13 - // 9 10 14 15 - zigzag = [16]uint8{0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15} -) - -// parseResiduals4 parses a 4x4 region of residual coefficients, as specified -// in section 13.3, and returns a 0/1 value indicating whether there was at -// least one non-zero coefficient. -// r is the partition to read bits from. -// plane and context describe which token probability table to use. context is -// either 0, 1 or 2, and equals how many of the macroblock left and macroblock -// above have non-zero coefficients. -// quant are the DC/AC quantization factors. -// skipFirstCoeff is whether the DC coefficient has already been parsed. -// coeffBase is the base index of d.coeff to write to. -func (d *Decoder) parseResiduals4(r *partition, plane int, context uint8, quant [2]uint16, skipFirstCoeff bool, coeffBase int) uint8 { - prob, n := &d.tokenProb[plane], 0 - if skipFirstCoeff { - n = 1 - } - p := prob[bands[n]][context] - if !r.readBit(p[0]) { - return 0 - } - for n != 16 { - n++ - if !r.readBit(p[1]) { - p = prob[bands[n]][0] - continue - } - var v uint32 - if !r.readBit(p[2]) { - v = 1 - p = prob[bands[n]][1] - } else { - if !r.readBit(p[3]) { - if !r.readBit(p[4]) { - v = 2 - } else { - v = 3 + r.readUint(p[5], 1) - } - } else if !r.readBit(p[6]) { - if !r.readBit(p[7]) { - // Category 1. - v = 5 + r.readUint(159, 1) - } else { - // Category 2. - v = 7 + 2*r.readUint(165, 1) + r.readUint(145, 1) - } - } else { - // Categories 3, 4, 5 or 6. - b1 := r.readUint(p[8], 1) - b0 := r.readUint(p[9+b1], 1) - cat := 2*b1 + b0 - tab := &cat3456[cat] - v = 0 - for i := 0; tab[i] != 0; i++ { - v *= 2 - v += r.readUint(tab[i], 1) - } - v += 3 + (8 << cat) - } - p = prob[bands[n]][2] - } - z := zigzag[n-1] - c := int32(v) * int32(quant[btou(z > 0)]) - if r.readBit(uniformProb) { - c = -c - } - d.coeff[coeffBase+int(z)] = int16(c) - if n == 16 || !r.readBit(p[0]) { - return 1 - } - } - return 1 -} - -// parseResiduals parses the residuals and returns whether inner loop filtering -// should be skipped for this macroblock. -func (d *Decoder) parseResiduals(mbx, mby int) (skip bool) { - partition := &d.op[mby&(d.nOP-1)] - plane := planeY1SansY2 - quant := &d.quant[d.segment] - - // Parse the DC coefficient of each 4x4 luma region. - if d.usePredY16 { - nz := d.parseResiduals4(partition, planeY2, d.leftMB.nzY16+d.upMB[mbx].nzY16, quant.y2, false, whtCoeffBase) - d.leftMB.nzY16 = nz - d.upMB[mbx].nzY16 = nz - d.inverseWHT16() - plane = planeY1WithY2 - } - - var ( - nzDC, nzAC [4]uint8 - nzDCMask, nzACMask uint32 - coeffBase int - ) - - // Parse the luma coefficients. - lnz := unpack[d.leftMB.nzMask&0x0f] - unz := unpack[d.upMB[mbx].nzMask&0x0f] - for y := 0; y < 4; y++ { - nz := lnz[y] - for x := 0; x < 4; x++ { - nz = d.parseResiduals4(partition, plane, nz+unz[x], quant.y1, d.usePredY16, coeffBase) - unz[x] = nz - nzAC[x] = nz - nzDC[x] = btou(d.coeff[coeffBase] != 0) - coeffBase += 16 - } - lnz[y] = nz - nzDCMask |= pack(nzDC, y*4) - nzACMask |= pack(nzAC, y*4) - } - lnzMask := pack(lnz, 0) - unzMask := pack(unz, 0) - - // Parse the chroma coefficients. - lnz = unpack[d.leftMB.nzMask>>4] - unz = unpack[d.upMB[mbx].nzMask>>4] - for c := 0; c < 4; c += 2 { - for y := 0; y < 2; y++ { - nz := lnz[y+c] - for x := 0; x < 2; x++ { - nz = d.parseResiduals4(partition, planeUV, nz+unz[x+c], quant.uv, false, coeffBase) - unz[x+c] = nz - nzAC[y*2+x] = nz - nzDC[y*2+x] = btou(d.coeff[coeffBase] != 0) - coeffBase += 16 - } - lnz[y+c] = nz - } - nzDCMask |= pack(nzDC, 16+c*2) - nzACMask |= pack(nzAC, 16+c*2) - } - lnzMask |= pack(lnz, 4) - unzMask |= pack(unz, 4) - - // Save decoder state. - d.leftMB.nzMask = uint8(lnzMask) - d.upMB[mbx].nzMask = uint8(unzMask) - d.nzDCMask = nzDCMask - d.nzACMask = nzACMask - - // Section 15.1 of the spec says that "Steps 2 and 4 [of the loop filter] - // are skipped... [if] there is no DCT coefficient coded for the whole - // macroblock." - return nzDCMask == 0 && nzACMask == 0 -} - -// reconstructMacroblock applies the predictor functions and adds the inverse- -// DCT transformed residuals to recover the YCbCr data. -func (d *Decoder) reconstructMacroblock(mbx, mby int) { - if d.usePredY16 { - p := checkTopLeftPred(mbx, mby, d.predY16) - predFunc16[p](d, 1, 8) - for j := 0; j < 4; j++ { - for i := 0; i < 4; i++ { - n := 4*j + i - y := 4*j + 1 - x := 4*i + 8 - mask := uint32(1) << uint(n) - if d.nzACMask&mask != 0 { - d.inverseDCT4(y, x, 16*n) - } else if d.nzDCMask&mask != 0 { - d.inverseDCT4DCOnly(y, x, 16*n) - } - } - } - } else { - for j := 0; j < 4; j++ { - for i := 0; i < 4; i++ { - n := 4*j + i - y := 4*j + 1 - x := 4*i + 8 - predFunc4[d.predY4[j][i]](d, y, x) - mask := uint32(1) << uint(n) - if d.nzACMask&mask != 0 { - d.inverseDCT4(y, x, 16*n) - } else if d.nzDCMask&mask != 0 { - d.inverseDCT4DCOnly(y, x, 16*n) - } - } - } - } - p := checkTopLeftPred(mbx, mby, d.predC8) - predFunc8[p](d, ybrBY, ybrBX) - if d.nzACMask&0x0f0000 != 0 { - d.inverseDCT8(ybrBY, ybrBX, bCoeffBase) - } else if d.nzDCMask&0x0f0000 != 0 { - d.inverseDCT8DCOnly(ybrBY, ybrBX, bCoeffBase) - } - predFunc8[p](d, ybrRY, ybrRX) - if d.nzACMask&0xf00000 != 0 { - d.inverseDCT8(ybrRY, ybrRX, rCoeffBase) - } else if d.nzDCMask&0xf00000 != 0 { - d.inverseDCT8DCOnly(ybrRY, ybrRX, rCoeffBase) - } -} - -// reconstruct reconstructs one macroblock and returns whether inner loop -// filtering should be skipped for it. -func (d *Decoder) reconstruct(mbx, mby int) (skip bool) { - if d.segmentHeader.updateMap { - if !d.fp.readBit(d.segmentHeader.prob[0]) { - d.segment = int(d.fp.readUint(d.segmentHeader.prob[1], 1)) - } else { - d.segment = int(d.fp.readUint(d.segmentHeader.prob[2], 1)) + 2 - } - } - if d.useSkipProb { - skip = d.fp.readBit(d.skipProb) - } - // Prepare the workspace. - for i := range d.coeff { - d.coeff[i] = 0 - } - d.prepareYBR(mbx, mby) - // Parse the predictor modes. - d.usePredY16 = d.fp.readBit(145) - if d.usePredY16 { - d.parsePredModeY16(mbx) - } else { - d.parsePredModeY4(mbx) - } - d.parsePredModeC8() - // Parse the residuals. - if !skip { - skip = d.parseResiduals(mbx, mby) - } else { - if d.usePredY16 { - d.leftMB.nzY16 = 0 - d.upMB[mbx].nzY16 = 0 - } - d.leftMB.nzMask = 0 - d.upMB[mbx].nzMask = 0 - d.nzDCMask = 0 - d.nzACMask = 0 - } - // Reconstruct the YCbCr data and copy it to the image. - d.reconstructMacroblock(mbx, mby) - for i, y := (mby*d.img.YStride+mbx)*16, 0; y < 16; i, y = i+d.img.YStride, y+1 { - copy(d.img.Y[i:i+16], d.ybr[ybrYY+y][ybrYX:ybrYX+16]) - } - for i, y := (mby*d.img.CStride+mbx)*8, 0; y < 8; i, y = i+d.img.CStride, y+1 { - copy(d.img.Cb[i:i+8], d.ybr[ybrBY+y][ybrBX:ybrBX+8]) - copy(d.img.Cr[i:i+8], d.ybr[ybrRY+y][ybrRX:ybrRX+8]) - } - return skip -} diff --git a/vendor/golang.org/x/image/vp8/token.go b/vendor/golang.org/x/image/vp8/token.go deleted file mode 100644 index da99cf0f9..000000000 --- a/vendor/golang.org/x/image/vp8/token.go +++ /dev/null @@ -1,381 +0,0 @@ -// Copyright 2011 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 - -// This file contains token probabilities for decoding DCT/WHT coefficients, as -// specified in chapter 13. - -func (d *Decoder) parseTokenProb() { - for i := range d.tokenProb { - for j := range d.tokenProb[i] { - for k := range d.tokenProb[i][j] { - for l := range d.tokenProb[i][j][k] { - if d.fp.readBit(tokenProbUpdateProb[i][j][k][l]) { - d.tokenProb[i][j][k][l] = uint8(d.fp.readUint(uniformProb, 8)) - } - } - } - } - } -} - -// The plane enumeration is specified in section 13.3. -const ( - planeY1WithY2 = iota - planeY2 - planeUV - planeY1SansY2 - nPlane -) - -const ( - nBand = 8 - nContext = 3 - nProb = 11 -) - -// Token probability update probabilities are specified in section 13.4. -var tokenProbUpdateProb = [nPlane][nBand][nContext][nProb]uint8{ - { - { - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {176, 246, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {223, 241, 252, 255, 255, 255, 255, 255, 255, 255, 255}, - {249, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 244, 252, 255, 255, 255, 255, 255, 255, 255, 255}, - {234, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 246, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {239, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {251, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {251, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 254, 253, 255, 254, 255, 255, 255, 255, 255, 255}, - {250, 255, 254, 255, 254, 255, 255, 255, 255, 255, 255}, - {254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - }, - { - { - {217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {225, 252, 241, 253, 255, 255, 254, 255, 255, 255, 255}, - {234, 250, 241, 250, 253, 255, 253, 254, 255, 255, 255}, - }, - { - {255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {223, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {238, 253, 254, 254, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {249, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {247, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {252, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255}, - {250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - }, - { - { - {186, 251, 250, 255, 255, 255, 255, 255, 255, 255, 255}, - {234, 251, 244, 254, 255, 255, 255, 255, 255, 255, 255}, - {251, 251, 243, 253, 254, 255, 254, 255, 255, 255, 255}, - }, - { - {255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {236, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {251, 253, 253, 254, 254, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {254, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {254, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - }, - { - { - {248, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {250, 254, 252, 254, 255, 255, 255, 255, 255, 255, 255}, - {248, 254, 249, 253, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255}, - {246, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255}, - {252, 254, 251, 254, 254, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 254, 252, 255, 255, 255, 255, 255, 255, 255, 255}, - {248, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255}, - {253, 255, 254, 254, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {245, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {253, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 251, 253, 255, 255, 255, 255, 255, 255, 255, 255}, - {252, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 252, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {249, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 255, 253, 255, 255, 255, 255, 255, 255, 255, 255}, - {250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - { - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}, - }, - }, -} - -// Default token probabilities are specified in section 13.5. -var defaultTokenProb = [nPlane][nBand][nContext][nProb]uint8{ - { - { - {128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128}, - {128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128}, - {128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128}, - }, - { - {253, 136, 254, 255, 228, 219, 128, 128, 128, 128, 128}, - {189, 129, 242, 255, 227, 213, 255, 219, 128, 128, 128}, - {106, 126, 227, 252, 214, 209, 255, 255, 128, 128, 128}, - }, - { - {1, 98, 248, 255, 236, 226, 255, 255, 128, 128, 128}, - {181, 133, 238, 254, 221, 234, 255, 154, 128, 128, 128}, - {78, 134, 202, 247, 198, 180, 255, 219, 128, 128, 128}, - }, - { - {1, 185, 249, 255, 243, 255, 128, 128, 128, 128, 128}, - {184, 150, 247, 255, 236, 224, 128, 128, 128, 128, 128}, - {77, 110, 216, 255, 236, 230, 128, 128, 128, 128, 128}, - }, - { - {1, 101, 251, 255, 241, 255, 128, 128, 128, 128, 128}, - {170, 139, 241, 252, 236, 209, 255, 255, 128, 128, 128}, - {37, 116, 196, 243, 228, 255, 255, 255, 128, 128, 128}, - }, - { - {1, 204, 254, 255, 245, 255, 128, 128, 128, 128, 128}, - {207, 160, 250, 255, 238, 128, 128, 128, 128, 128, 128}, - {102, 103, 231, 255, 211, 171, 128, 128, 128, 128, 128}, - }, - { - {1, 152, 252, 255, 240, 255, 128, 128, 128, 128, 128}, - {177, 135, 243, 255, 234, 225, 128, 128, 128, 128, 128}, - {80, 129, 211, 255, 194, 224, 128, 128, 128, 128, 128}, - }, - { - {1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128}, - {246, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128}, - {255, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128}, - }, - }, - { - { - {198, 35, 237, 223, 193, 187, 162, 160, 145, 155, 62}, - {131, 45, 198, 221, 172, 176, 220, 157, 252, 221, 1}, - {68, 47, 146, 208, 149, 167, 221, 162, 255, 223, 128}, - }, - { - {1, 149, 241, 255, 221, 224, 255, 255, 128, 128, 128}, - {184, 141, 234, 253, 222, 220, 255, 199, 128, 128, 128}, - {81, 99, 181, 242, 176, 190, 249, 202, 255, 255, 128}, - }, - { - {1, 129, 232, 253, 214, 197, 242, 196, 255, 255, 128}, - {99, 121, 210, 250, 201, 198, 255, 202, 128, 128, 128}, - {23, 91, 163, 242, 170, 187, 247, 210, 255, 255, 128}, - }, - { - {1, 200, 246, 255, 234, 255, 128, 128, 128, 128, 128}, - {109, 178, 241, 255, 231, 245, 255, 255, 128, 128, 128}, - {44, 130, 201, 253, 205, 192, 255, 255, 128, 128, 128}, - }, - { - {1, 132, 239, 251, 219, 209, 255, 165, 128, 128, 128}, - {94, 136, 225, 251, 218, 190, 255, 255, 128, 128, 128}, - {22, 100, 174, 245, 186, 161, 255, 199, 128, 128, 128}, - }, - { - {1, 182, 249, 255, 232, 235, 128, 128, 128, 128, 128}, - {124, 143, 241, 255, 227, 234, 128, 128, 128, 128, 128}, - {35, 77, 181, 251, 193, 211, 255, 205, 128, 128, 128}, - }, - { - {1, 157, 247, 255, 236, 231, 255, 255, 128, 128, 128}, - {121, 141, 235, 255, 225, 227, 255, 255, 128, 128, 128}, - {45, 99, 188, 251, 195, 217, 255, 224, 128, 128, 128}, - }, - { - {1, 1, 251, 255, 213, 255, 128, 128, 128, 128, 128}, - {203, 1, 248, 255, 255, 128, 128, 128, 128, 128, 128}, - {137, 1, 177, 255, 224, 255, 128, 128, 128, 128, 128}, - }, - }, - { - { - {253, 9, 248, 251, 207, 208, 255, 192, 128, 128, 128}, - {175, 13, 224, 243, 193, 185, 249, 198, 255, 255, 128}, - {73, 17, 171, 221, 161, 179, 236, 167, 255, 234, 128}, - }, - { - {1, 95, 247, 253, 212, 183, 255, 255, 128, 128, 128}, - {239, 90, 244, 250, 211, 209, 255, 255, 128, 128, 128}, - {155, 77, 195, 248, 188, 195, 255, 255, 128, 128, 128}, - }, - { - {1, 24, 239, 251, 218, 219, 255, 205, 128, 128, 128}, - {201, 51, 219, 255, 196, 186, 128, 128, 128, 128, 128}, - {69, 46, 190, 239, 201, 218, 255, 228, 128, 128, 128}, - }, - { - {1, 191, 251, 255, 255, 128, 128, 128, 128, 128, 128}, - {223, 165, 249, 255, 213, 255, 128, 128, 128, 128, 128}, - {141, 124, 248, 255, 255, 128, 128, 128, 128, 128, 128}, - }, - { - {1, 16, 248, 255, 255, 128, 128, 128, 128, 128, 128}, - {190, 36, 230, 255, 236, 255, 128, 128, 128, 128, 128}, - {149, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128}, - }, - { - {1, 226, 255, 128, 128, 128, 128, 128, 128, 128, 128}, - {247, 192, 255, 128, 128, 128, 128, 128, 128, 128, 128}, - {240, 128, 255, 128, 128, 128, 128, 128, 128, 128, 128}, - }, - { - {1, 134, 252, 255, 255, 128, 128, 128, 128, 128, 128}, - {213, 62, 250, 255, 255, 128, 128, 128, 128, 128, 128}, - {55, 93, 255, 128, 128, 128, 128, 128, 128, 128, 128}, - }, - { - {128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128}, - {128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128}, - {128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128}, - }, - }, - { - { - {202, 24, 213, 235, 186, 191, 220, 160, 240, 175, 255}, - {126, 38, 182, 232, 169, 184, 228, 174, 255, 187, 128}, - {61, 46, 138, 219, 151, 178, 240, 170, 255, 216, 128}, - }, - { - {1, 112, 230, 250, 199, 191, 247, 159, 255, 255, 128}, - {166, 109, 228, 252, 211, 215, 255, 174, 128, 128, 128}, - {39, 77, 162, 232, 172, 180, 245, 178, 255, 255, 128}, - }, - { - {1, 52, 220, 246, 198, 199, 249, 220, 255, 255, 128}, - {124, 74, 191, 243, 183, 193, 250, 221, 255, 255, 128}, - {24, 71, 130, 219, 154, 170, 243, 182, 255, 255, 128}, - }, - { - {1, 182, 225, 249, 219, 240, 255, 224, 128, 128, 128}, - {149, 150, 226, 252, 216, 205, 255, 171, 128, 128, 128}, - {28, 108, 170, 242, 183, 194, 254, 223, 255, 255, 128}, - }, - { - {1, 81, 230, 252, 204, 203, 255, 192, 128, 128, 128}, - {123, 102, 209, 247, 188, 196, 255, 233, 128, 128, 128}, - {20, 95, 153, 243, 164, 173, 255, 203, 128, 128, 128}, - }, - { - {1, 222, 248, 255, 216, 213, 128, 128, 128, 128, 128}, - {168, 175, 246, 252, 235, 205, 255, 255, 128, 128, 128}, - {47, 116, 215, 255, 211, 212, 255, 255, 128, 128, 128}, - }, - { - {1, 121, 236, 253, 212, 214, 255, 255, 128, 128, 128}, - {141, 84, 213, 252, 201, 202, 255, 219, 128, 128, 128}, - {42, 80, 160, 240, 162, 185, 255, 205, 128, 128, 128}, - }, - { - {1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128}, - {244, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128}, - {238, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128}, - }, - }, -} diff --git a/vendor/golang.org/x/image/vp8l/decode.go b/vendor/golang.org/x/image/vp8l/decode.go deleted file mode 100644 index 431948701..000000000 --- a/vendor/golang.org/x/image/vp8l/decode.go +++ /dev/null @@ -1,603 +0,0 @@ -// 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 vp8l implements a decoder for the VP8L lossless image format. -// -// The VP8L specification is at: -// https://developers.google.com/speed/webp/docs/riff_container -package vp8l // import "golang.org/x/image/vp8l" - -import ( - "bufio" - "errors" - "image" - "image/color" - "io" -) - -var ( - errInvalidCodeLengths = errors.New("vp8l: invalid code lengths") - errInvalidHuffmanTree = errors.New("vp8l: invalid Huffman tree") -) - -// colorCacheMultiplier is the multiplier used for the color cache hash -// function, specified in section 4.2.3. -const colorCacheMultiplier = 0x1e35a7bd - -// distanceMapTable is the look-up table for distanceMap. -var distanceMapTable = [120]uint8{ - 0x18, 0x07, 0x17, 0x19, 0x28, 0x06, 0x27, 0x29, 0x16, 0x1a, - 0x26, 0x2a, 0x38, 0x05, 0x37, 0x39, 0x15, 0x1b, 0x36, 0x3a, - 0x25, 0x2b, 0x48, 0x04, 0x47, 0x49, 0x14, 0x1c, 0x35, 0x3b, - 0x46, 0x4a, 0x24, 0x2c, 0x58, 0x45, 0x4b, 0x34, 0x3c, 0x03, - 0x57, 0x59, 0x13, 0x1d, 0x56, 0x5a, 0x23, 0x2d, 0x44, 0x4c, - 0x55, 0x5b, 0x33, 0x3d, 0x68, 0x02, 0x67, 0x69, 0x12, 0x1e, - 0x66, 0x6a, 0x22, 0x2e, 0x54, 0x5c, 0x43, 0x4d, 0x65, 0x6b, - 0x32, 0x3e, 0x78, 0x01, 0x77, 0x79, 0x53, 0x5d, 0x11, 0x1f, - 0x64, 0x6c, 0x42, 0x4e, 0x76, 0x7a, 0x21, 0x2f, 0x75, 0x7b, - 0x31, 0x3f, 0x63, 0x6d, 0x52, 0x5e, 0x00, 0x74, 0x7c, 0x41, - 0x4f, 0x10, 0x20, 0x62, 0x6e, 0x30, 0x73, 0x7d, 0x51, 0x5f, - 0x40, 0x72, 0x7e, 0x61, 0x6f, 0x50, 0x71, 0x7f, 0x60, 0x70, -} - -// distanceMap maps a LZ77 backwards reference distance to a two-dimensional -// pixel offset, specified in section 4.2.2. -func distanceMap(w int32, code uint32) int32 { - if int32(code) > int32(len(distanceMapTable)) { - return int32(code) - int32(len(distanceMapTable)) - } - distCode := int32(distanceMapTable[code-1]) - yOffset := distCode >> 4 - xOffset := 8 - distCode&0xf - if d := yOffset*w + xOffset; d >= 1 { - return d - } - return 1 -} - -// decoder holds the bit-stream for a VP8L image. -type decoder struct { - r io.ByteReader - bits uint32 - nBits uint32 -} - -// read reads the next n bits from the decoder's bit-stream. -func (d *decoder) read(n uint32) (uint32, error) { - for d.nBits < n { - c, err := d.r.ReadByte() - if err != nil { - if err == io.EOF { - err = io.ErrUnexpectedEOF - } - return 0, err - } - d.bits |= uint32(c) << d.nBits - d.nBits += 8 - } - u := d.bits & (1<<n - 1) - d.bits >>= n - d.nBits -= n - return u, nil -} - -// decodeTransform decodes the next transform and the width of the image after -// transformation (or equivalently, before inverse transformation), specified -// in section 3. -func (d *decoder) decodeTransform(w int32, h int32) (t transform, newWidth int32, err error) { - t.oldWidth = w - t.transformType, err = d.read(2) - if err != nil { - return transform{}, 0, err - } - switch t.transformType { - case transformTypePredictor, transformTypeCrossColor: - t.bits, err = d.read(3) - if err != nil { - return transform{}, 0, err - } - t.bits += 2 - t.pix, err = d.decodePix(nTiles(w, t.bits), nTiles(h, t.bits), 0, false) - if err != nil { - return transform{}, 0, err - } - case transformTypeSubtractGreen: - // No-op. - case transformTypeColorIndexing: - nColors, err := d.read(8) - if err != nil { - return transform{}, 0, err - } - nColors++ - t.bits = 0 - switch { - case nColors <= 2: - t.bits = 3 - case nColors <= 4: - t.bits = 2 - case nColors <= 16: - t.bits = 1 - } - w = nTiles(w, t.bits) - pix, err := d.decodePix(int32(nColors), 1, 4*256, false) - if err != nil { - return transform{}, 0, err - } - for p := 4; p < len(pix); p += 4 { - pix[p+0] += pix[p-4] - pix[p+1] += pix[p-3] - pix[p+2] += pix[p-2] - pix[p+3] += pix[p-1] - } - // The spec says that "if the index is equal or larger than color_table_size, - // the argb color value should be set to 0x00000000 (transparent black)." - // We re-slice up to 256 4-byte pixels. - t.pix = pix[:4*256] - } - return t, w, nil -} - -// repeatsCodeLength is the minimum code length for repeated codes. -const repeatsCodeLength = 16 - -// These magic numbers are specified at the end of section 5.2.2. -// The 3-length arrays apply to code lengths >= repeatsCodeLength. -var ( - codeLengthCodeOrder = [19]uint8{ - 17, 18, 0, 1, 2, 3, 4, 5, 16, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, - } - repeatBits = [3]uint8{2, 3, 7} - repeatOffsets = [3]uint8{3, 3, 11} -) - -// decodeCodeLengths decodes a Huffman tree's code lengths which are themselves -// encoded via a Huffman tree, specified in section 5.2.2. -func (d *decoder) decodeCodeLengths(dst []uint32, codeLengthCodeLengths []uint32) error { - h := hTree{} - if err := h.build(codeLengthCodeLengths); err != nil { - return err - } - - maxSymbol := len(dst) - useLength, err := d.read(1) - if err != nil { - return err - } - if useLength != 0 { - n, err := d.read(3) - if err != nil { - return err - } - n = 2 + 2*n - ms, err := d.read(n) - if err != nil { - return err - } - maxSymbol = int(ms) + 2 - if maxSymbol > len(dst) { - return errInvalidCodeLengths - } - } - - // The spec says that "if code 16 [meaning repeat] is used before - // a non-zero value has been emitted, a value of 8 is repeated." - prevCodeLength := uint32(8) - - for symbol := 0; symbol < len(dst); { - if maxSymbol == 0 { - break - } - maxSymbol-- - codeLength, err := h.next(d) - if err != nil { - return err - } - if codeLength < repeatsCodeLength { - dst[symbol] = codeLength - symbol++ - if codeLength != 0 { - prevCodeLength = codeLength - } - continue - } - - repeat, err := d.read(uint32(repeatBits[codeLength-repeatsCodeLength])) - if err != nil { - return err - } - repeat += uint32(repeatOffsets[codeLength-repeatsCodeLength]) - if symbol+int(repeat) > len(dst) { - return errInvalidCodeLengths - } - // A code length of 16 repeats the previous non-zero code. - // A code length of 17 or 18 repeats zeroes. - cl := uint32(0) - if codeLength == 16 { - cl = prevCodeLength - } - for ; repeat > 0; repeat-- { - dst[symbol] = cl - symbol++ - } - } - return nil -} - -// decodeHuffmanTree decodes a Huffman tree into h. -func (d *decoder) decodeHuffmanTree(h *hTree, alphabetSize uint32) error { - useSimple, err := d.read(1) - if err != nil { - return err - } - if useSimple != 0 { - nSymbols, err := d.read(1) - if err != nil { - return err - } - nSymbols++ - firstSymbolLengthCode, err := d.read(1) - if err != nil { - return err - } - firstSymbolLengthCode = 7*firstSymbolLengthCode + 1 - var symbols [2]uint32 - symbols[0], err = d.read(firstSymbolLengthCode) - if err != nil { - return err - } - if nSymbols == 2 { - symbols[1], err = d.read(8) - if err != nil { - return err - } - } - return h.buildSimple(nSymbols, symbols, alphabetSize) - } - - nCodes, err := d.read(4) - if err != nil { - return err - } - nCodes += 4 - if int(nCodes) > len(codeLengthCodeOrder) { - return errInvalidHuffmanTree - } - codeLengthCodeLengths := [len(codeLengthCodeOrder)]uint32{} - for i := uint32(0); i < nCodes; i++ { - codeLengthCodeLengths[codeLengthCodeOrder[i]], err = d.read(3) - if err != nil { - return err - } - } - codeLengths := make([]uint32, alphabetSize) - if err = d.decodeCodeLengths(codeLengths, codeLengthCodeLengths[:]); err != nil { - return err - } - return h.build(codeLengths) -} - -const ( - huffGreen = 0 - huffRed = 1 - huffBlue = 2 - huffAlpha = 3 - huffDistance = 4 - nHuff = 5 -) - -// hGroup is an array of 5 Huffman trees. -type hGroup [nHuff]hTree - -// decodeHuffmanGroups decodes the one or more hGroups used to decode the pixel -// data. If one hGroup is used for the entire image, then hPix and hBits will -// be zero. If more than one hGroup is used, then hPix contains the meta-image -// that maps tiles to hGroup index, and hBits contains the log-2 tile size. -func (d *decoder) decodeHuffmanGroups(w int32, h int32, topLevel bool, ccBits uint32) ( - hGroups []hGroup, hPix []byte, hBits uint32, err error) { - - maxHGroupIndex := 0 - if topLevel { - useMeta, err := d.read(1) - if err != nil { - return nil, nil, 0, err - } - if useMeta != 0 { - hBits, err = d.read(3) - if err != nil { - return nil, nil, 0, err - } - hBits += 2 - hPix, err = d.decodePix(nTiles(w, hBits), nTiles(h, hBits), 0, false) - if err != nil { - return nil, nil, 0, err - } - for p := 0; p < len(hPix); p += 4 { - i := int(hPix[p])<<8 | int(hPix[p+1]) - if maxHGroupIndex < i { - maxHGroupIndex = i - } - } - } - } - hGroups = make([]hGroup, maxHGroupIndex+1) - for i := range hGroups { - for j, alphabetSize := range alphabetSizes { - if j == 0 && ccBits > 0 { - alphabetSize += 1 << ccBits - } - if err := d.decodeHuffmanTree(&hGroups[i][j], alphabetSize); err != nil { - return nil, nil, 0, err - } - } - } - return hGroups, hPix, hBits, nil -} - -const ( - nLiteralCodes = 256 - nLengthCodes = 24 - nDistanceCodes = 40 -) - -var alphabetSizes = [nHuff]uint32{ - nLiteralCodes + nLengthCodes, - nLiteralCodes, - nLiteralCodes, - nLiteralCodes, - nDistanceCodes, -} - -// decodePix decodes pixel data, specified in section 5.2.2. -func (d *decoder) decodePix(w int32, h int32, minCap int32, topLevel bool) ([]byte, error) { - // Decode the color cache parameters. - ccBits, ccShift, ccEntries := uint32(0), uint32(0), ([]uint32)(nil) - useColorCache, err := d.read(1) - if err != nil { - return nil, err - } - if useColorCache != 0 { - ccBits, err = d.read(4) - if err != nil { - return nil, err - } - if ccBits < 1 || 11 < ccBits { - return nil, errors.New("vp8l: invalid color cache parameters") - } - ccShift = 32 - ccBits - ccEntries = make([]uint32, 1<<ccBits) - } - - // Decode the Huffman groups. - hGroups, hPix, hBits, err := d.decodeHuffmanGroups(w, h, topLevel, ccBits) - if err != nil { - return nil, err - } - hMask, tilesPerRow := int32(0), int32(0) - if hBits != 0 { - hMask, tilesPerRow = 1<<hBits-1, nTiles(w, hBits) - } - - // Decode the pixels. - if minCap < 4*w*h { - minCap = 4 * w * h - } - pix := make([]byte, 4*w*h, minCap) - p, cachedP := 0, 0 - x, y := int32(0), int32(0) - hg, lookupHG := &hGroups[0], hMask != 0 - for p < len(pix) { - if lookupHG { - i := 4 * (tilesPerRow*(y>>hBits) + (x >> hBits)) - hg = &hGroups[uint32(hPix[i])<<8|uint32(hPix[i+1])] - } - - green, err := hg[huffGreen].next(d) - if err != nil { - return nil, err - } - switch { - case green < nLiteralCodes: - // We have a literal pixel. - red, err := hg[huffRed].next(d) - if err != nil { - return nil, err - } - blue, err := hg[huffBlue].next(d) - if err != nil { - return nil, err - } - alpha, err := hg[huffAlpha].next(d) - if err != nil { - return nil, err - } - pix[p+0] = uint8(red) - pix[p+1] = uint8(green) - pix[p+2] = uint8(blue) - pix[p+3] = uint8(alpha) - p += 4 - - x++ - if x == w { - x, y = 0, y+1 - } - lookupHG = hMask != 0 && x&hMask == 0 - - case green < nLiteralCodes+nLengthCodes: - // We have a LZ77 backwards reference. - length, err := d.lz77Param(green - nLiteralCodes) - if err != nil { - return nil, err - } - distSym, err := hg[huffDistance].next(d) - if err != nil { - return nil, err - } - distCode, err := d.lz77Param(distSym) - if err != nil { - return nil, err - } - dist := distanceMap(w, distCode) - pEnd := p + 4*int(length) - q := p - 4*int(dist) - qEnd := pEnd - 4*int(dist) - if p < 0 || len(pix) < pEnd || q < 0 || len(pix) < qEnd { - return nil, errors.New("vp8l: invalid LZ77 parameters") - } - for ; p < pEnd; p, q = p+1, q+1 { - pix[p] = pix[q] - } - - x += int32(length) - for x >= w { - x, y = x-w, y+1 - } - lookupHG = hMask != 0 - - default: - // We have a color cache lookup. First, insert previous pixels - // into the cache. Note that VP8L assumes ARGB order, but the - // Go image.RGBA type is in RGBA order. - for ; cachedP < p; cachedP += 4 { - argb := uint32(pix[cachedP+0])<<16 | - uint32(pix[cachedP+1])<<8 | - uint32(pix[cachedP+2])<<0 | - uint32(pix[cachedP+3])<<24 - ccEntries[(argb*colorCacheMultiplier)>>ccShift] = argb - } - green -= nLiteralCodes + nLengthCodes - if int(green) >= len(ccEntries) { - return nil, errors.New("vp8l: invalid color cache index") - } - argb := ccEntries[green] - pix[p+0] = uint8(argb >> 16) - pix[p+1] = uint8(argb >> 8) - pix[p+2] = uint8(argb >> 0) - pix[p+3] = uint8(argb >> 24) - p += 4 - - x++ - if x == w { - x, y = 0, y+1 - } - lookupHG = hMask != 0 && x&hMask == 0 - } - } - return pix, nil -} - -// lz77Param returns the next LZ77 parameter: a length or a distance, specified -// in section 4.2.2. -func (d *decoder) lz77Param(symbol uint32) (uint32, error) { - if symbol < 4 { - return symbol + 1, nil - } - extraBits := (symbol - 2) >> 1 - offset := (2 + symbol&1) << extraBits - n, err := d.read(extraBits) - if err != nil { - return 0, err - } - return offset + n + 1, nil -} - -// decodeHeader decodes the VP8L header from r. -func decodeHeader(r io.Reader) (d *decoder, w int32, h int32, err error) { - rr, ok := r.(io.ByteReader) - if !ok { - rr = bufio.NewReader(r) - } - d = &decoder{r: rr} - magic, err := d.read(8) - if err != nil { - return nil, 0, 0, err - } - if magic != 0x2f { - return nil, 0, 0, errors.New("vp8l: invalid header") - } - width, err := d.read(14) - if err != nil { - return nil, 0, 0, err - } - width++ - height, err := d.read(14) - if err != nil { - return nil, 0, 0, err - } - height++ - _, err = d.read(1) // Read and ignore the hasAlpha hint. - if err != nil { - return nil, 0, 0, err - } - version, err := d.read(3) - if err != nil { - return nil, 0, 0, err - } - if version != 0 { - return nil, 0, 0, errors.New("vp8l: invalid version") - } - return d, int32(width), int32(height), nil -} - -// DecodeConfig decodes the color model and dimensions of a VP8L image from r. -func DecodeConfig(r io.Reader) (image.Config, error) { - _, w, h, err := decodeHeader(r) - if err != nil { - return image.Config{}, err - } - return image.Config{ - ColorModel: color.NRGBAModel, - Width: int(w), - Height: int(h), - }, nil -} - -// Decode decodes a VP8L image from r. -func Decode(r io.Reader) (image.Image, error) { - d, w, h, err := decodeHeader(r) - if err != nil { - return nil, err - } - // Decode the transforms. - var ( - nTransforms int - transforms [nTransformTypes]transform - transformsSeen [nTransformTypes]bool - originalW = w - ) - for { - more, err := d.read(1) - if err != nil { - return nil, err - } - if more == 0 { - break - } - var t transform - t, w, err = d.decodeTransform(w, h) - if err != nil { - return nil, err - } - if transformsSeen[t.transformType] { - return nil, errors.New("vp8l: repeated transform") - } - transformsSeen[t.transformType] = true - transforms[nTransforms] = t - nTransforms++ - } - // Decode the transformed pixels. - pix, err := d.decodePix(w, h, 0, true) - if err != nil { - return nil, err - } - // Apply the inverse transformations. - for i := nTransforms - 1; i >= 0; i-- { - t := &transforms[i] - pix = inverseTransforms[t.transformType](t, pix, h) - } - return &image.NRGBA{ - Pix: pix, - Stride: 4 * int(originalW), - Rect: image.Rect(0, 0, int(originalW), int(h)), - }, nil -} diff --git a/vendor/golang.org/x/image/vp8l/huffman.go b/vendor/golang.org/x/image/vp8l/huffman.go deleted file mode 100644 index 36368a872..000000000 --- a/vendor/golang.org/x/image/vp8l/huffman.go +++ /dev/null @@ -1,245 +0,0 @@ -// 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 vp8l - -import ( - "io" -) - -// reverseBits reverses the bits in a byte. -var reverseBits = [256]uint8{ - 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, - 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, - 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, - 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, - 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, - 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, - 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, - 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, - 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, - 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, - 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, - 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, - 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, - 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, - 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, - 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff, -} - -// hNode is a node in a Huffman tree. -type hNode struct { - // symbol is the symbol held by this node. - symbol uint32 - // children, if positive, is the hTree.nodes index of the first of - // this node's two children. Zero means an uninitialized node, - // and -1 means a leaf node. - children int32 -} - -const leafNode = -1 - -// lutSize is the log-2 size of an hTree's look-up table. -const lutSize, lutMask = 7, 1<<7 - 1 - -// hTree is a Huffman tree. -type hTree struct { - // nodes are the nodes of the Huffman tree. During construction, - // len(nodes) grows from 1 up to cap(nodes) by steps of two. - // After construction, len(nodes) == cap(nodes), and both equal - // 2*theNumberOfSymbols - 1. - nodes []hNode - // lut is a look-up table for walking the nodes. The x in lut[x] is - // the next lutSize bits in the bit-stream. The low 8 bits of lut[x] - // equals 1 plus the number of bits in the next code, or 0 if the - // next code requires more than lutSize bits. The high 24 bits are: - // - the symbol, if the code requires lutSize or fewer bits, or - // - the hTree.nodes index to start the tree traversal from, if - // the next code requires more than lutSize bits. - lut [1 << lutSize]uint32 -} - -// insert inserts into the hTree a symbol whose encoding is the least -// significant codeLength bits of code. -func (h *hTree) insert(symbol uint32, code uint32, codeLength uint32) error { - if symbol > 0xffff || codeLength > 0xfe { - return errInvalidHuffmanTree - } - baseCode := uint32(0) - if codeLength > lutSize { - baseCode = uint32(reverseBits[(code>>(codeLength-lutSize))&0xff]) >> (8 - lutSize) - } else { - baseCode = uint32(reverseBits[code&0xff]) >> (8 - codeLength) - for i := 0; i < 1<<(lutSize-codeLength); i++ { - h.lut[baseCode|uint32(i)<<codeLength] = symbol<<8 | (codeLength + 1) - } - } - - n := uint32(0) - for jump := lutSize; codeLength > 0; { - codeLength-- - if int(n) > len(h.nodes) { - return errInvalidHuffmanTree - } - switch h.nodes[n].children { - case leafNode: - return errInvalidHuffmanTree - case 0: - if len(h.nodes) == cap(h.nodes) { - return errInvalidHuffmanTree - } - // Create two empty child nodes. - h.nodes[n].children = int32(len(h.nodes)) - h.nodes = h.nodes[:len(h.nodes)+2] - } - n = uint32(h.nodes[n].children) + 1&(code>>codeLength) - jump-- - if jump == 0 && h.lut[baseCode] == 0 { - h.lut[baseCode] = n << 8 - } - } - - switch h.nodes[n].children { - case leafNode: - // No-op. - case 0: - // Turn the uninitialized node into a leaf. - h.nodes[n].children = leafNode - default: - return errInvalidHuffmanTree - } - h.nodes[n].symbol = symbol - return nil -} - -// codeLengthsToCodes returns the canonical Huffman codes implied by the -// sequence of code lengths. -func codeLengthsToCodes(codeLengths []uint32) ([]uint32, error) { - maxCodeLength := uint32(0) - for _, cl := range codeLengths { - if maxCodeLength < cl { - maxCodeLength = cl - } - } - const maxAllowedCodeLength = 15 - if len(codeLengths) == 0 || maxCodeLength > maxAllowedCodeLength { - return nil, errInvalidHuffmanTree - } - histogram := [maxAllowedCodeLength + 1]uint32{} - for _, cl := range codeLengths { - histogram[cl]++ - } - currCode, nextCodes := uint32(0), [maxAllowedCodeLength + 1]uint32{} - for cl := 1; cl < len(nextCodes); cl++ { - currCode = (currCode + histogram[cl-1]) << 1 - nextCodes[cl] = currCode - } - codes := make([]uint32, len(codeLengths)) - for symbol, cl := range codeLengths { - if cl > 0 { - codes[symbol] = nextCodes[cl] - nextCodes[cl]++ - } - } - return codes, nil -} - -// build builds a canonical Huffman tree from the given code lengths. -func (h *hTree) build(codeLengths []uint32) error { - // Calculate the number of symbols. - var nSymbols, lastSymbol uint32 - for symbol, cl := range codeLengths { - if cl != 0 { - nSymbols++ - lastSymbol = uint32(symbol) - } - } - if nSymbols == 0 { - return errInvalidHuffmanTree - } - h.nodes = make([]hNode, 1, 2*nSymbols-1) - // Handle the trivial case. - if nSymbols == 1 { - if len(codeLengths) <= int(lastSymbol) { - return errInvalidHuffmanTree - } - return h.insert(lastSymbol, 0, 0) - } - // Handle the non-trivial case. - codes, err := codeLengthsToCodes(codeLengths) - if err != nil { - return err - } - for symbol, cl := range codeLengths { - if cl > 0 { - if err := h.insert(uint32(symbol), codes[symbol], cl); err != nil { - return err - } - } - } - return nil -} - -// buildSimple builds a Huffman tree with 1 or 2 symbols. -func (h *hTree) buildSimple(nSymbols uint32, symbols [2]uint32, alphabetSize uint32) error { - h.nodes = make([]hNode, 1, 2*nSymbols-1) - for i := uint32(0); i < nSymbols; i++ { - if symbols[i] >= alphabetSize { - return errInvalidHuffmanTree - } - if err := h.insert(symbols[i], i, nSymbols-1); err != nil { - return err - } - } - return nil -} - -// next returns the next Huffman-encoded symbol from the bit-stream d. -func (h *hTree) next(d *decoder) (uint32, error) { - var n uint32 - // Read enough bits so that we can use the look-up table. - if d.nBits < lutSize { - c, err := d.r.ReadByte() - if err != nil { - if err == io.EOF { - // There are no more bytes of data, but we may still be able - // to read the next symbol out of the previously read bits. - goto slowPath - } - return 0, err - } - d.bits |= uint32(c) << d.nBits - d.nBits += 8 - } - // Use the look-up table. - n = h.lut[d.bits&lutMask] - if b := n & 0xff; b != 0 { - b-- - d.bits >>= b - d.nBits -= b - return n >> 8, nil - } - n >>= 8 - d.bits >>= lutSize - d.nBits -= lutSize - -slowPath: - for h.nodes[n].children != leafNode { - if d.nBits == 0 { - c, err := d.r.ReadByte() - if err != nil { - if err == io.EOF { - err = io.ErrUnexpectedEOF - } - return 0, err - } - d.bits = uint32(c) - d.nBits = 8 - } - n = uint32(h.nodes[n].children) + 1&d.bits - d.bits >>= 1 - d.nBits-- - } - return h.nodes[n].symbol, nil -} diff --git a/vendor/golang.org/x/image/vp8l/transform.go b/vendor/golang.org/x/image/vp8l/transform.go deleted file mode 100644 index 06543dacb..000000000 --- a/vendor/golang.org/x/image/vp8l/transform.go +++ /dev/null @@ -1,299 +0,0 @@ -// 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 vp8l - -// This file deals with image transforms, specified in section 3. - -// nTiles returns the number of tiles needed to cover size pixels, where each -// tile's side is 1<<bits pixels long. -func nTiles(size int32, bits uint32) int32 { - return (size + 1<<bits - 1) >> bits -} - -const ( - transformTypePredictor = 0 - transformTypeCrossColor = 1 - transformTypeSubtractGreen = 2 - transformTypeColorIndexing = 3 - nTransformTypes = 4 -) - -// transform holds the parameters for an invertible transform. -type transform struct { - // transformType is the type of the transform. - transformType uint32 - // oldWidth is the width of the image before transformation (or - // equivalently, after inverse transformation). The color-indexing - // transform can reduce the width. For example, a 50-pixel-wide - // image that only needs 4 bits (half a byte) per color index can - // be transformed into a 25-pixel-wide image. - oldWidth int32 - // bits is the log-2 size of the transform's tiles, for the predictor - // and cross-color transforms. 8>>bits is the number of bits per - // color index, for the color-index transform. - bits uint32 - // pix is the tile values, for the predictor and cross-color - // transforms, and the color palette, for the color-index transform. - pix []byte -} - -var inverseTransforms = [nTransformTypes]func(*transform, []byte, int32) []byte{ - transformTypePredictor: inversePredictor, - transformTypeCrossColor: inverseCrossColor, - transformTypeSubtractGreen: inverseSubtractGreen, - transformTypeColorIndexing: inverseColorIndexing, -} - -func inversePredictor(t *transform, pix []byte, h int32) []byte { - if t.oldWidth == 0 || h == 0 { - return pix - } - // The first pixel's predictor is mode 0 (opaque black). - pix[3] += 0xff - p, mask := int32(4), int32(1)<<t.bits-1 - for x := int32(1); x < t.oldWidth; x++ { - // The rest of the first row's predictor is mode 1 (L). - pix[p+0] += pix[p-4] - pix[p+1] += pix[p-3] - pix[p+2] += pix[p-2] - pix[p+3] += pix[p-1] - p += 4 - } - top, tilesPerRow := 0, nTiles(t.oldWidth, t.bits) - for y := int32(1); y < h; y++ { - // The first column's predictor is mode 2 (T). - pix[p+0] += pix[top+0] - pix[p+1] += pix[top+1] - pix[p+2] += pix[top+2] - pix[p+3] += pix[top+3] - p, top = p+4, top+4 - - q := 4 * (y >> t.bits) * tilesPerRow - predictorMode := t.pix[q+1] & 0x0f - q += 4 - for x := int32(1); x < t.oldWidth; x++ { - if x&mask == 0 { - predictorMode = t.pix[q+1] & 0x0f - q += 4 - } - switch predictorMode { - case 0: // Opaque black. - pix[p+3] += 0xff - - case 1: // L. - pix[p+0] += pix[p-4] - pix[p+1] += pix[p-3] - pix[p+2] += pix[p-2] - pix[p+3] += pix[p-1] - - case 2: // T. - pix[p+0] += pix[top+0] - pix[p+1] += pix[top+1] - pix[p+2] += pix[top+2] - pix[p+3] += pix[top+3] - - case 3: // TR. - pix[p+0] += pix[top+4] - pix[p+1] += pix[top+5] - pix[p+2] += pix[top+6] - pix[p+3] += pix[top+7] - - case 4: // TL. - pix[p+0] += pix[top-4] - pix[p+1] += pix[top-3] - pix[p+2] += pix[top-2] - pix[p+3] += pix[top-1] - - case 5: // Average2(Average2(L, TR), T). - pix[p+0] += avg2(avg2(pix[p-4], pix[top+4]), pix[top+0]) - pix[p+1] += avg2(avg2(pix[p-3], pix[top+5]), pix[top+1]) - pix[p+2] += avg2(avg2(pix[p-2], pix[top+6]), pix[top+2]) - pix[p+3] += avg2(avg2(pix[p-1], pix[top+7]), pix[top+3]) - - case 6: // Average2(L, TL). - pix[p+0] += avg2(pix[p-4], pix[top-4]) - pix[p+1] += avg2(pix[p-3], pix[top-3]) - pix[p+2] += avg2(pix[p-2], pix[top-2]) - pix[p+3] += avg2(pix[p-1], pix[top-1]) - - case 7: // Average2(L, T). - pix[p+0] += avg2(pix[p-4], pix[top+0]) - pix[p+1] += avg2(pix[p-3], pix[top+1]) - pix[p+2] += avg2(pix[p-2], pix[top+2]) - pix[p+3] += avg2(pix[p-1], pix[top+3]) - - case 8: // Average2(TL, T). - pix[p+0] += avg2(pix[top-4], pix[top+0]) - pix[p+1] += avg2(pix[top-3], pix[top+1]) - pix[p+2] += avg2(pix[top-2], pix[top+2]) - pix[p+3] += avg2(pix[top-1], pix[top+3]) - - case 9: // Average2(T, TR). - pix[p+0] += avg2(pix[top+0], pix[top+4]) - pix[p+1] += avg2(pix[top+1], pix[top+5]) - pix[p+2] += avg2(pix[top+2], pix[top+6]) - pix[p+3] += avg2(pix[top+3], pix[top+7]) - - case 10: // Average2(Average2(L, TL), Average2(T, TR)). - pix[p+0] += avg2(avg2(pix[p-4], pix[top-4]), avg2(pix[top+0], pix[top+4])) - pix[p+1] += avg2(avg2(pix[p-3], pix[top-3]), avg2(pix[top+1], pix[top+5])) - pix[p+2] += avg2(avg2(pix[p-2], pix[top-2]), avg2(pix[top+2], pix[top+6])) - pix[p+3] += avg2(avg2(pix[p-1], pix[top-1]), avg2(pix[top+3], pix[top+7])) - - case 11: // Select(L, T, TL). - l0 := int32(pix[p-4]) - l1 := int32(pix[p-3]) - l2 := int32(pix[p-2]) - l3 := int32(pix[p-1]) - c0 := int32(pix[top-4]) - c1 := int32(pix[top-3]) - c2 := int32(pix[top-2]) - c3 := int32(pix[top-1]) - t0 := int32(pix[top+0]) - t1 := int32(pix[top+1]) - t2 := int32(pix[top+2]) - t3 := int32(pix[top+3]) - l := abs(c0-t0) + abs(c1-t1) + abs(c2-t2) + abs(c3-t3) - t := abs(c0-l0) + abs(c1-l1) + abs(c2-l2) + abs(c3-l3) - if l < t { - pix[p+0] += uint8(l0) - pix[p+1] += uint8(l1) - pix[p+2] += uint8(l2) - pix[p+3] += uint8(l3) - } else { - pix[p+0] += uint8(t0) - pix[p+1] += uint8(t1) - pix[p+2] += uint8(t2) - pix[p+3] += uint8(t3) - } - - case 12: // ClampAddSubtractFull(L, T, TL). - pix[p+0] += clampAddSubtractFull(pix[p-4], pix[top+0], pix[top-4]) - pix[p+1] += clampAddSubtractFull(pix[p-3], pix[top+1], pix[top-3]) - pix[p+2] += clampAddSubtractFull(pix[p-2], pix[top+2], pix[top-2]) - pix[p+3] += clampAddSubtractFull(pix[p-1], pix[top+3], pix[top-1]) - - case 13: // ClampAddSubtractHalf(Average2(L, T), TL). - pix[p+0] += clampAddSubtractHalf(avg2(pix[p-4], pix[top+0]), pix[top-4]) - pix[p+1] += clampAddSubtractHalf(avg2(pix[p-3], pix[top+1]), pix[top-3]) - pix[p+2] += clampAddSubtractHalf(avg2(pix[p-2], pix[top+2]), pix[top-2]) - pix[p+3] += clampAddSubtractHalf(avg2(pix[p-1], pix[top+3]), pix[top-1]) - } - p, top = p+4, top+4 - } - } - return pix -} - -func inverseCrossColor(t *transform, pix []byte, h int32) []byte { - var greenToRed, greenToBlue, redToBlue int32 - p, mask, tilesPerRow := int32(0), int32(1)<<t.bits-1, nTiles(t.oldWidth, t.bits) - for y := int32(0); y < h; y++ { - q := 4 * (y >> t.bits) * tilesPerRow - for x := int32(0); x < t.oldWidth; x++ { - if x&mask == 0 { - redToBlue = int32(int8(t.pix[q+0])) - greenToBlue = int32(int8(t.pix[q+1])) - greenToRed = int32(int8(t.pix[q+2])) - q += 4 - } - red := pix[p+0] - green := pix[p+1] - blue := pix[p+2] - red += uint8(uint32(greenToRed*int32(int8(green))) >> 5) - blue += uint8(uint32(greenToBlue*int32(int8(green))) >> 5) - blue += uint8(uint32(redToBlue*int32(int8(red))) >> 5) - pix[p+0] = red - pix[p+2] = blue - p += 4 - } - } - return pix -} - -func inverseSubtractGreen(t *transform, pix []byte, h int32) []byte { - for p := 0; p < len(pix); p += 4 { - green := pix[p+1] - pix[p+0] += green - pix[p+2] += green - } - return pix -} - -func inverseColorIndexing(t *transform, pix []byte, h int32) []byte { - if t.bits == 0 { - for p := 0; p < len(pix); p += 4 { - i := 4 * uint32(pix[p+1]) - pix[p+0] = t.pix[i+0] - pix[p+1] = t.pix[i+1] - pix[p+2] = t.pix[i+2] - pix[p+3] = t.pix[i+3] - } - return pix - } - - vMask, xMask, bitsPerPixel := uint32(0), int32(0), uint32(8>>t.bits) - switch t.bits { - case 1: - vMask, xMask = 0x0f, 0x01 - case 2: - vMask, xMask = 0x03, 0x03 - case 3: - vMask, xMask = 0x01, 0x07 - } - - d, p, v, dst := 0, 0, uint32(0), make([]byte, 4*t.oldWidth*h) - for y := int32(0); y < h; y++ { - for x := int32(0); x < t.oldWidth; x++ { - if x&xMask == 0 { - v = uint32(pix[p+1]) - p += 4 - } - - i := 4 * (v & vMask) - dst[d+0] = t.pix[i+0] - dst[d+1] = t.pix[i+1] - dst[d+2] = t.pix[i+2] - dst[d+3] = t.pix[i+3] - d += 4 - - v >>= bitsPerPixel - } - } - return dst -} - -func abs(x int32) int32 { - if x < 0 { - return -x - } - return x -} - -func avg2(a, b uint8) uint8 { - return uint8((int32(a) + int32(b)) / 2) -} - -func clampAddSubtractFull(a, b, c uint8) uint8 { - x := int32(a) + int32(b) - int32(c) - if x < 0 { - return 0 - } - if x > 255 { - return 255 - } - return uint8(x) -} - -func clampAddSubtractHalf(a, b uint8) uint8 { - x := int32(a) + (int32(a)-int32(b))/2 - if x < 0 { - return 0 - } - if x > 255 { - return 255 - } - return uint8(x) -} diff --git a/vendor/golang.org/x/image/webp/decode.go b/vendor/golang.org/x/image/webp/decode.go deleted file mode 100644 index e211c7d57..000000000 --- a/vendor/golang.org/x/image/webp/decode.go +++ /dev/null @@ -1,276 +0,0 @@ -// Copyright 2011 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 webp - -import ( - "bytes" - "errors" - "image" - "image/color" - "io" - - "golang.org/x/image/riff" - "golang.org/x/image/vp8" - "golang.org/x/image/vp8l" -) - -var errInvalidFormat = errors.New("webp: invalid format") - -var ( - fccALPH = riff.FourCC{'A', 'L', 'P', 'H'} - fccVP8 = riff.FourCC{'V', 'P', '8', ' '} - fccVP8L = riff.FourCC{'V', 'P', '8', 'L'} - fccVP8X = riff.FourCC{'V', 'P', '8', 'X'} - fccWEBP = riff.FourCC{'W', 'E', 'B', 'P'} -) - -func decode(r io.Reader, configOnly bool) (image.Image, image.Config, error) { - formType, riffReader, err := riff.NewReader(r) - if err != nil { - return nil, image.Config{}, err - } - if formType != fccWEBP { - return nil, image.Config{}, errInvalidFormat - } - - var ( - alpha []byte - alphaStride int - wantAlpha bool - seenVP8X bool - widthMinusOne uint32 - heightMinusOne uint32 - buf [10]byte - ) - for { - chunkID, chunkLen, chunkData, err := riffReader.Next() - if err == io.EOF { - err = errInvalidFormat - } - if err != nil { - return nil, image.Config{}, err - } - - switch chunkID { - case fccALPH: - if !wantAlpha { - return nil, image.Config{}, errInvalidFormat - } - wantAlpha = false - // Read the Pre-processing | Filter | Compression byte. - if _, err := io.ReadFull(chunkData, buf[:1]); err != nil { - if err == io.EOF { - err = errInvalidFormat - } - return nil, image.Config{}, err - } - alpha, alphaStride, err = readAlpha(chunkData, widthMinusOne, heightMinusOne, buf[0]&0x03) - if err != nil { - return nil, image.Config{}, err - } - unfilterAlpha(alpha, alphaStride, (buf[0]>>2)&0x03) - - case fccVP8: - if wantAlpha || int32(chunkLen) < 0 { - return nil, image.Config{}, errInvalidFormat - } - d := vp8.NewDecoder() - d.Init(chunkData, int(chunkLen)) - fh, err := d.DecodeFrameHeader() - if err != nil { - return nil, image.Config{}, err - } - if configOnly { - return nil, image.Config{ - ColorModel: color.YCbCrModel, - Width: fh.Width, - Height: fh.Height, - }, nil - } - m, err := d.DecodeFrame() - if err != nil { - return nil, image.Config{}, err - } - if alpha != nil { - return &image.NYCbCrA{ - YCbCr: *m, - A: alpha, - AStride: alphaStride, - }, image.Config{}, nil - } - return m, image.Config{}, nil - - case fccVP8L: - if wantAlpha || alpha != nil { - return nil, image.Config{}, errInvalidFormat - } - if configOnly { - c, err := vp8l.DecodeConfig(chunkData) - return nil, c, err - } - m, err := vp8l.Decode(chunkData) - return m, image.Config{}, err - - case fccVP8X: - if seenVP8X { - return nil, image.Config{}, errInvalidFormat - } - seenVP8X = true - if chunkLen != 10 { - return nil, image.Config{}, errInvalidFormat - } - if _, err := io.ReadFull(chunkData, buf[:10]); err != nil { - return nil, image.Config{}, err - } - const ( - animationBit = 1 << 1 - xmpMetadataBit = 1 << 2 - exifMetadataBit = 1 << 3 - alphaBit = 1 << 4 - iccProfileBit = 1 << 5 - ) - wantAlpha = (buf[0] & alphaBit) != 0 - widthMinusOne = uint32(buf[4]) | uint32(buf[5])<<8 | uint32(buf[6])<<16 - heightMinusOne = uint32(buf[7]) | uint32(buf[8])<<8 | uint32(buf[9])<<16 - if configOnly { - if wantAlpha { - return nil, image.Config{ - ColorModel: color.NYCbCrAModel, - Width: int(widthMinusOne) + 1, - Height: int(heightMinusOne) + 1, - }, nil - } - return nil, image.Config{ - ColorModel: color.YCbCrModel, - Width: int(widthMinusOne) + 1, - Height: int(heightMinusOne) + 1, - }, nil - } - } - } -} - -func readAlpha(chunkData io.Reader, widthMinusOne, heightMinusOne uint32, compression byte) ( - alpha []byte, alphaStride int, err error) { - - switch compression { - case 0: - w := int(widthMinusOne) + 1 - h := int(heightMinusOne) + 1 - alpha = make([]byte, w*h) - if _, err := io.ReadFull(chunkData, alpha); err != nil { - return nil, 0, err - } - return alpha, w, nil - - case 1: - // Read the VP8L-compressed alpha values. First, synthesize a 5-byte VP8L header: - // a 1-byte magic number, a 14-bit widthMinusOne, a 14-bit heightMinusOne, - // a 1-bit (ignored, zero) alphaIsUsed and a 3-bit (zero) version. - // TODO(nigeltao): be more efficient than decoding an *image.NRGBA just to - // extract the green values to a separately allocated []byte. Fixing this - // will require changes to the vp8l package's API. - if widthMinusOne > 0x3fff || heightMinusOne > 0x3fff { - return nil, 0, errors.New("webp: invalid format") - } - alphaImage, err := vp8l.Decode(io.MultiReader( - bytes.NewReader([]byte{ - 0x2f, // VP8L magic number. - uint8(widthMinusOne), - uint8(widthMinusOne>>8) | uint8(heightMinusOne<<6), - uint8(heightMinusOne >> 2), - uint8(heightMinusOne >> 10), - }), - chunkData, - )) - if err != nil { - return nil, 0, err - } - // The green values of the inner NRGBA image are the alpha values of the - // outer NYCbCrA image. - pix := alphaImage.(*image.NRGBA).Pix - alpha = make([]byte, len(pix)/4) - for i := range alpha { - alpha[i] = pix[4*i+1] - } - return alpha, int(widthMinusOne) + 1, nil - } - return nil, 0, errInvalidFormat -} - -func unfilterAlpha(alpha []byte, alphaStride int, filter byte) { - if len(alpha) == 0 || alphaStride == 0 { - return - } - switch filter { - case 1: // Horizontal filter. - for i := 1; i < alphaStride; i++ { - alpha[i] += alpha[i-1] - } - for i := alphaStride; i < len(alpha); i += alphaStride { - // The first column is equivalent to the vertical filter. - alpha[i] += alpha[i-alphaStride] - - for j := 1; j < alphaStride; j++ { - alpha[i+j] += alpha[i+j-1] - } - } - - case 2: // Vertical filter. - // The first row is equivalent to the horizontal filter. - for i := 1; i < alphaStride; i++ { - alpha[i] += alpha[i-1] - } - - for i := alphaStride; i < len(alpha); i++ { - alpha[i] += alpha[i-alphaStride] - } - - case 3: // Gradient filter. - // The first row is equivalent to the horizontal filter. - for i := 1; i < alphaStride; i++ { - alpha[i] += alpha[i-1] - } - - for i := alphaStride; i < len(alpha); i += alphaStride { - // The first column is equivalent to the vertical filter. - alpha[i] += alpha[i-alphaStride] - - // The interior is predicted on the three top/left pixels. - for j := 1; j < alphaStride; j++ { - c := int(alpha[i+j-alphaStride-1]) - b := int(alpha[i+j-alphaStride]) - a := int(alpha[i+j-1]) - x := a + b - c - if x < 0 { - x = 0 - } else if x > 255 { - x = 255 - } - alpha[i+j] += uint8(x) - } - } - } -} - -// Decode reads a WEBP image from r and returns it as an image.Image. -func Decode(r io.Reader) (image.Image, error) { - m, _, err := decode(r, false) - if err != nil { - return nil, err - } - return m, err -} - -// DecodeConfig returns the color model and dimensions of a WEBP image without -// decoding the entire image. -func DecodeConfig(r io.Reader) (image.Config, error) { - _, c, err := decode(r, true) - return c, err -} - -func init() { - image.RegisterFormat("webp", "RIFF????WEBPVP8", Decode, DecodeConfig) -} diff --git a/vendor/golang.org/x/image/webp/doc.go b/vendor/golang.org/x/image/webp/doc.go deleted file mode 100644 index e321c8542..000000000 --- a/vendor/golang.org/x/image/webp/doc.go +++ /dev/null @@ -1,9 +0,0 @@ -// Copyright 2016 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 webp implements a decoder for WEBP images. -// -// WEBP is defined at: -// https://developers.google.com/speed/webp/docs/riff_container -package webp // import "golang.org/x/image/webp" |