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author | Christopher Speller <crspeller@gmail.com> | 2016-05-12 15:08:58 -0400 |
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committer | Christopher Speller <crspeller@gmail.com> | 2016-05-12 16:37:29 -0400 |
commit | 84d2482ddbff9564c9ad75b2d30af66e3ddfd44d (patch) | |
tree | 8bfa567d2b6381f4a996ada2deff8a16aa85a3ac /Godeps/_workspace/src/github.com/mattermost/rsc/qr/qr.go | |
parent | d1efb66ad7b017f0fbfe6f0c20843b30f396e504 (diff) | |
download | chat-84d2482ddbff9564c9ad75b2d30af66e3ddfd44d.tar.gz chat-84d2482ddbff9564c9ad75b2d30af66e3ddfd44d.tar.bz2 chat-84d2482ddbff9564c9ad75b2d30af66e3ddfd44d.zip |
Updating go depencancies. Switching to go1.6 vendoring (#2949)
Diffstat (limited to 'Godeps/_workspace/src/github.com/mattermost/rsc/qr/qr.go')
-rw-r--r-- | Godeps/_workspace/src/github.com/mattermost/rsc/qr/qr.go | 116 |
1 files changed, 0 insertions, 116 deletions
diff --git a/Godeps/_workspace/src/github.com/mattermost/rsc/qr/qr.go b/Godeps/_workspace/src/github.com/mattermost/rsc/qr/qr.go deleted file mode 100644 index 1d20d02f3..000000000 --- a/Godeps/_workspace/src/github.com/mattermost/rsc/qr/qr.go +++ /dev/null @@ -1,116 +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 qr encodes QR codes. -*/ -package qr - -import ( - "errors" - "image" - "image/color" - - "github.com/mattermost/rsc/qr/coding" -) - -// A Level denotes a QR error correction level. -// From least to most tolerant of errors, they are L, M, Q, H. -type Level int - -const ( - L Level = iota // 20% redundant - M // 38% redundant - Q // 55% redundant - H // 65% redundant -) - -// Encode returns an encoding of text at the given error correction level. -func Encode(text string, level Level) (*Code, error) { - // Pick data encoding, smallest first. - // We could split the string and use different encodings - // but that seems like overkill for now. - var enc coding.Encoding - switch { - case coding.Num(text).Check() == nil: - enc = coding.Num(text) - case coding.Alpha(text).Check() == nil: - enc = coding.Alpha(text) - default: - enc = coding.String(text) - } - - // Pick size. - l := coding.Level(level) - var v coding.Version - for v = coding.MinVersion; ; v++ { - if v > coding.MaxVersion { - return nil, errors.New("text too long to encode as QR") - } - if enc.Bits(v) <= v.DataBytes(l)*8 { - break - } - } - - // Build and execute plan. - p, err := coding.NewPlan(v, l, 0) - if err != nil { - return nil, err - } - cc, err := p.Encode(enc) - if err != nil { - return nil, err - } - - // TODO: Pick appropriate mask. - - return &Code{cc.Bitmap, cc.Size, cc.Stride, 8}, nil -} - -// A Code is a square pixel grid. -// It implements image.Image and direct PNG encoding. -type Code struct { - Bitmap []byte // 1 is black, 0 is white - Size int // number of pixels on a side - Stride int // number of bytes per row - Scale int // number of image pixels per QR pixel -} - -// Black returns true if the pixel at (x,y) is black. -func (c *Code) Black(x, y int) bool { - return 0 <= x && x < c.Size && 0 <= y && y < c.Size && - c.Bitmap[y*c.Stride+x/8]&(1<<uint(7-x&7)) != 0 -} - -// Image returns an Image displaying the code. -func (c *Code) Image() image.Image { - return &codeImage{c} - -} - -// codeImage implements image.Image -type codeImage struct { - *Code -} - -var ( - whiteColor color.Color = color.Gray{0xFF} - blackColor color.Color = color.Gray{0x00} -) - -func (c *codeImage) Bounds() image.Rectangle { - d := (c.Size + 8) * c.Scale - return image.Rect(0, 0, d, d) -} - -func (c *codeImage) At(x, y int) color.Color { - if c.Black(x, y) { - return blackColor - } - return whiteColor -} - -func (c *codeImage) ColorModel() color.Model { - return color.GrayModel -} |