Update to latest gomatrix. Things are broken
This commit is contained in:
Tulir Asokan
36
vendor/github.com/disintegration/imaging/effects.go
generated
vendored
36
vendor/github.com/disintegration/imaging/effects.go
generated
vendored
@ -38,9 +38,13 @@ func blurHorizontal(img image.Image, kernel []float64) *image.NRGBA {
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parallel(0, src.h, func(ys <-chan int) {
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scanLine := make([]uint8, src.w*4)
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scanLineF := make([]float64, len(scanLine))
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for y := range ys {
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src.scan(0, y, src.w, y+1, scanLine)
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for x := 0; x < src.w; x++ {
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for i, v := range scanLine {
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scanLineF[i] = float64(v)
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}
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for x, idx := 0, 0; x < src.w; x, idx = x+1, idx+4 {
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min := x - radius
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if min < 0 {
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min = 0
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@ -55,10 +59,10 @@ func blurHorizontal(img image.Image, kernel []float64) *image.NRGBA {
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i := ix * 4
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weight := kernel[absint(x-ix)]
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wsum += weight
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wa := float64(scanLine[i+3]) * weight
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r += float64(scanLine[i+0]) * wa
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g += float64(scanLine[i+1]) * wa
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b += float64(scanLine[i+2]) * wa
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wa := scanLineF[i+3] * weight
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r += scanLineF[i+0] * wa
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g += scanLineF[i+1] * wa
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b += scanLineF[i+2] * wa
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a += wa
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}
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if a != 0 {
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@ -67,12 +71,12 @@ func blurHorizontal(img image.Image, kernel []float64) *image.NRGBA {
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b /= a
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}
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j := y*dst.Stride + x*4
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dst.Pix[j+0] = clamp(r)
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dst.Pix[j+1] = clamp(g)
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dst.Pix[j+2] = clamp(b)
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dst.Pix[j+3] = clamp(a / wsum)
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scanLine[idx+0] = clamp(r)
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scanLine[idx+1] = clamp(g)
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scanLine[idx+2] = clamp(b)
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scanLine[idx+3] = clamp(a / wsum)
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}
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copy(dst.Pix[y*dst.Stride:], scanLine)
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}
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})
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@ -86,8 +90,12 @@ func blurVertical(img image.Image, kernel []float64) *image.NRGBA {
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parallel(0, src.w, func(xs <-chan int) {
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scanLine := make([]uint8, src.h*4)
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scanLineF := make([]float64, len(scanLine))
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for x := range xs {
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src.scan(x, 0, x+1, src.h, scanLine)
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for i, v := range scanLine {
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scanLineF[i] = float64(v)
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}
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for y := 0; y < src.h; y++ {
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min := y - radius
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if min < 0 {
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@ -103,10 +111,10 @@ func blurVertical(img image.Image, kernel []float64) *image.NRGBA {
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i := iy * 4
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weight := kernel[absint(y-iy)]
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wsum += weight
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wa := float64(scanLine[i+3]) * weight
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r += float64(scanLine[i+0]) * wa
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g += float64(scanLine[i+1]) * wa
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b += float64(scanLine[i+2]) * wa
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wa := scanLineF[i+3] * weight
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r += scanLineF[i+0] * wa
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g += scanLineF[i+1] * wa
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b += scanLineF[i+2] * wa
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a += wa
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}
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if a != 0 {
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272
vendor/github.com/disintegration/imaging/helpers.go
generated
vendored
272
vendor/github.com/disintegration/imaging/helpers.go
generated
vendored
@ -1,272 +0,0 @@
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package imaging
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import (
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"bytes"
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"errors"
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"image"
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"image/color"
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"image/draw"
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"image/gif"
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"image/jpeg"
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"image/png"
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"io"
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"os"
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"path/filepath"
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"strings"
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"golang.org/x/image/bmp"
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"golang.org/x/image/tiff"
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)
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// Format is an image file format.
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type Format int
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// Image file formats.
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const (
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JPEG Format = iota
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PNG
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GIF
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TIFF
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BMP
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)
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func (f Format) String() string {
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switch f {
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case JPEG:
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return "JPEG"
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case PNG:
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return "PNG"
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case GIF:
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return "GIF"
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case TIFF:
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return "TIFF"
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case BMP:
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return "BMP"
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default:
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return "Unsupported"
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}
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}
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var formatFromExt = map[string]Format{
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".jpg": JPEG,
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".jpeg": JPEG,
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".png": PNG,
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".tif": TIFF,
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".tiff": TIFF,
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".bmp": BMP,
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".gif": GIF,
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}
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// FormatFromFilename parses image format from filename extension:
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// "jpg" (or "jpeg"), "png", "gif", "tif" (or "tiff") and "bmp" are supported.
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func FormatFromFilename(filename string) (Format, error) {
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ext := strings.ToLower(filepath.Ext(filename))
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if f, ok := formatFromExt[ext]; ok {
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return f, nil
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}
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return -1, ErrUnsupportedFormat
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}
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var (
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// ErrUnsupportedFormat means the given image format (or file extension) is unsupported.
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ErrUnsupportedFormat = errors.New("imaging: unsupported image format")
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)
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type fileSystem interface {
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Create(string) (io.WriteCloser, error)
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Open(string) (io.ReadCloser, error)
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}
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type localFS struct{}
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func (localFS) Create(name string) (io.WriteCloser, error) { return os.Create(name) }
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func (localFS) Open(name string) (io.ReadCloser, error) { return os.Open(name) }
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var fs fileSystem = localFS{}
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// Decode reads an image from r.
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func Decode(r io.Reader) (image.Image, error) {
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img, _, err := image.Decode(r)
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return img, err
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}
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// Open loads an image from file
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func Open(filename string) (image.Image, error) {
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file, err := fs.Open(filename)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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return Decode(file)
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}
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type encodeConfig struct {
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jpegQuality int
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gifNumColors int
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gifQuantizer draw.Quantizer
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gifDrawer draw.Drawer
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pngCompressionLevel png.CompressionLevel
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}
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var defaultEncodeConfig = encodeConfig{
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jpegQuality: 95,
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gifNumColors: 256,
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gifQuantizer: nil,
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gifDrawer: nil,
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pngCompressionLevel: png.DefaultCompression,
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}
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// EncodeOption sets an optional parameter for the Encode and Save functions.
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type EncodeOption func(*encodeConfig)
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// JPEGQuality returns an EncodeOption that sets the output JPEG quality.
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// Quality ranges from 1 to 100 inclusive, higher is better. Default is 95.
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func JPEGQuality(quality int) EncodeOption {
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return func(c *encodeConfig) {
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c.jpegQuality = quality
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}
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}
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// GIFNumColors returns an EncodeOption that sets the maximum number of colors
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// used in the GIF-encoded image. It ranges from 1 to 256. Default is 256.
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func GIFNumColors(numColors int) EncodeOption {
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return func(c *encodeConfig) {
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c.gifNumColors = numColors
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}
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}
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// GIFQuantizer returns an EncodeOption that sets the quantizer that is used to produce
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// a palette of the GIF-encoded image.
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func GIFQuantizer(quantizer draw.Quantizer) EncodeOption {
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return func(c *encodeConfig) {
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c.gifQuantizer = quantizer
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}
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}
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// GIFDrawer returns an EncodeOption that sets the drawer that is used to convert
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// the source image to the desired palette of the GIF-encoded image.
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func GIFDrawer(drawer draw.Drawer) EncodeOption {
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return func(c *encodeConfig) {
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c.gifDrawer = drawer
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}
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}
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// PNGCompressionLevel returns an EncodeOption that sets the compression level
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// of the PNG-encoded image. Default is png.DefaultCompression.
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func PNGCompressionLevel(level png.CompressionLevel) EncodeOption {
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return func(c *encodeConfig) {
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c.pngCompressionLevel = level
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}
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}
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// Encode writes the image img to w in the specified format (JPEG, PNG, GIF, TIFF or BMP).
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func Encode(w io.Writer, img image.Image, format Format, opts ...EncodeOption) error {
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cfg := defaultEncodeConfig
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for _, option := range opts {
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option(&cfg)
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}
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var err error
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switch format {
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case JPEG:
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var rgba *image.RGBA
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if nrgba, ok := img.(*image.NRGBA); ok {
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if nrgba.Opaque() {
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rgba = &image.RGBA{
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Pix: nrgba.Pix,
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Stride: nrgba.Stride,
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Rect: nrgba.Rect,
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}
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}
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}
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if rgba != nil {
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err = jpeg.Encode(w, rgba, &jpeg.Options{Quality: cfg.jpegQuality})
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} else {
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err = jpeg.Encode(w, img, &jpeg.Options{Quality: cfg.jpegQuality})
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}
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case PNG:
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enc := png.Encoder{CompressionLevel: cfg.pngCompressionLevel}
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err = enc.Encode(w, img)
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case GIF:
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err = gif.Encode(w, img, &gif.Options{
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NumColors: cfg.gifNumColors,
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Quantizer: cfg.gifQuantizer,
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Drawer: cfg.gifDrawer,
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})
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case TIFF:
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err = tiff.Encode(w, img, &tiff.Options{Compression: tiff.Deflate, Predictor: true})
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case BMP:
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err = bmp.Encode(w, img)
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default:
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err = ErrUnsupportedFormat
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}
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return err
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}
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// Save saves the image to file with the specified filename.
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// The format is determined from the filename extension: "jpg" (or "jpeg"), "png", "gif", "tif" (or "tiff") and "bmp" are supported.
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//
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// Examples:
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//
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// // Save the image as PNG.
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// err := imaging.Save(img, "out.png")
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//
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// // Save the image as JPEG with optional quality parameter set to 80.
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// err := imaging.Save(img, "out.jpg", imaging.JPEGQuality(80))
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//
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func Save(img image.Image, filename string, opts ...EncodeOption) (err error) {
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f, err := FormatFromFilename(filename)
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if err != nil {
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return err
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}
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file, err := fs.Create(filename)
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||||
if err != nil {
|
||||
return err
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||||
}
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||||
|
||||
defer func() {
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||||
cerr := file.Close()
|
||||
if err == nil {
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||||
err = cerr
|
||||
}
|
||||
}()
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||||
|
||||
return Encode(file, img, f, opts...)
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||||
}
|
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|
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// New creates a new image with the specified width and height, and fills it with the specified color.
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||||
func New(width, height int, fillColor color.Color) *image.NRGBA {
|
||||
if width <= 0 || height <= 0 {
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||||
return &image.NRGBA{}
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||||
}
|
||||
|
||||
c := color.NRGBAModel.Convert(fillColor).(color.NRGBA)
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if (c == color.NRGBA{0, 0, 0, 0}) {
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return image.NewNRGBA(image.Rect(0, 0, width, height))
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||||
}
|
||||
|
||||
return &image.NRGBA{
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||||
Pix: bytes.Repeat([]byte{c.R, c.G, c.B, c.A}, width*height),
|
||||
Stride: 4 * width,
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||||
Rect: image.Rect(0, 0, width, height),
|
||||
}
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||||
}
|
||||
|
||||
// Clone returns a copy of the given image.
|
||||
func Clone(img image.Image) *image.NRGBA {
|
||||
src := newScanner(img)
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||||
dst := image.NewNRGBA(image.Rect(0, 0, src.w, src.h))
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||||
size := src.w * 4
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||||
parallel(0, src.h, func(ys <-chan int) {
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for y := range ys {
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||||
i := y * dst.Stride
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||||
src.scan(0, y, src.w, y+1, dst.Pix[i:i+size])
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||||
}
|
||||
})
|
||||
return dst
|
||||
}
|
||||
463
vendor/github.com/disintegration/imaging/io.go
generated
vendored
Normal file
463
vendor/github.com/disintegration/imaging/io.go
generated
vendored
Normal file
@ -0,0 +1,463 @@
|
||||
package imaging
|
||||
|
||||
import (
|
||||
"encoding/binary"
|
||||
"errors"
|
||||
"image"
|
||||
"image/draw"
|
||||
"image/gif"
|
||||
"image/jpeg"
|
||||
"image/png"
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"strings"
|
||||
|
||||
"golang.org/x/image/bmp"
|
||||
"golang.org/x/image/tiff"
|
||||
)
|
||||
|
||||
// Format is an image file format.
|
||||
type Format int
|
||||
|
||||
// Image file formats.
|
||||
const (
|
||||
JPEG Format = iota
|
||||
PNG
|
||||
GIF
|
||||
TIFF
|
||||
BMP
|
||||
)
|
||||
|
||||
func (f Format) String() string {
|
||||
switch f {
|
||||
case JPEG:
|
||||
return "JPEG"
|
||||
case PNG:
|
||||
return "PNG"
|
||||
case GIF:
|
||||
return "GIF"
|
||||
case TIFF:
|
||||
return "TIFF"
|
||||
case BMP:
|
||||
return "BMP"
|
||||
default:
|
||||
return "Unsupported"
|
||||
}
|
||||
}
|
||||
|
||||
var formatFromExt = map[string]Format{
|
||||
"jpg": JPEG,
|
||||
"jpeg": JPEG,
|
||||
"png": PNG,
|
||||
"tif": TIFF,
|
||||
"tiff": TIFF,
|
||||
"bmp": BMP,
|
||||
"gif": GIF,
|
||||
}
|
||||
|
||||
// FormatFromExtension parses image format from extension:
|
||||
// "jpg" (or "jpeg"), "png", "gif", "tif" (or "tiff") and "bmp" are supported.
|
||||
func FormatFromExtension(ext string) (Format, error) {
|
||||
if f, ok := formatFromExt[strings.ToLower(strings.TrimPrefix(ext, "."))]; ok {
|
||||
return f, nil
|
||||
}
|
||||
return -1, ErrUnsupportedFormat
|
||||
}
|
||||
|
||||
// FormatFromFilename parses image format from filename extension:
|
||||
// "jpg" (or "jpeg"), "png", "gif", "tif" (or "tiff") and "bmp" are supported.
|
||||
func FormatFromFilename(filename string) (Format, error) {
|
||||
ext := filepath.Ext(filename)
|
||||
return FormatFromExtension(ext)
|
||||
}
|
||||
|
||||
var (
|
||||
// ErrUnsupportedFormat means the given image format (or file extension) is unsupported.
|
||||
ErrUnsupportedFormat = errors.New("imaging: unsupported image format")
|
||||
)
|
||||
|
||||
type fileSystem interface {
|
||||
Create(string) (io.WriteCloser, error)
|
||||
Open(string) (io.ReadCloser, error)
|
||||
}
|
||||
|
||||
type localFS struct{}
|
||||
|
||||
func (localFS) Create(name string) (io.WriteCloser, error) { return os.Create(name) }
|
||||
func (localFS) Open(name string) (io.ReadCloser, error) { return os.Open(name) }
|
||||
|
||||
var fs fileSystem = localFS{}
|
||||
|
||||
type decodeConfig struct {
|
||||
autoOrientation bool
|
||||
}
|
||||
|
||||
var defaultDecodeConfig = decodeConfig{
|
||||
autoOrientation: false,
|
||||
}
|
||||
|
||||
// DecodeOption sets an optional parameter for the Decode and Open functions.
|
||||
type DecodeOption func(*decodeConfig)
|
||||
|
||||
// AutoOrientation returns a DecodeOption that sets the auto-orientation mode.
|
||||
// If auto-orientation is enabled, the image will be transformed after decoding
|
||||
// according to the EXIF orientation tag (if present). By default it's disabled.
|
||||
func AutoOrientation(enabled bool) DecodeOption {
|
||||
return func(c *decodeConfig) {
|
||||
c.autoOrientation = enabled
|
||||
}
|
||||
}
|
||||
|
||||
// Decode reads an image from r.
|
||||
func Decode(r io.Reader, opts ...DecodeOption) (image.Image, error) {
|
||||
cfg := defaultDecodeConfig
|
||||
for _, option := range opts {
|
||||
option(&cfg)
|
||||
}
|
||||
|
||||
if !cfg.autoOrientation {
|
||||
img, _, err := image.Decode(r)
|
||||
return img, err
|
||||
}
|
||||
|
||||
var orient orientation
|
||||
pr, pw := io.Pipe()
|
||||
r = io.TeeReader(r, pw)
|
||||
done := make(chan struct{})
|
||||
go func() {
|
||||
defer close(done)
|
||||
orient = readOrientation(pr)
|
||||
io.Copy(ioutil.Discard, pr)
|
||||
}()
|
||||
|
||||
img, _, err := image.Decode(r)
|
||||
pw.Close()
|
||||
<-done
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return fixOrientation(img, orient), nil
|
||||
}
|
||||
|
||||
// Open loads an image from file.
|
||||
//
|
||||
// Examples:
|
||||
//
|
||||
// // Load an image from file.
|
||||
// img, err := imaging.Open("test.jpg")
|
||||
//
|
||||
// // Load an image and transform it depending on the EXIF orientation tag (if present).
|
||||
// img, err := imaging.Open("test.jpg", imaging.AutoOrientation(true))
|
||||
//
|
||||
func Open(filename string, opts ...DecodeOption) (image.Image, error) {
|
||||
file, err := fs.Open(filename)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer file.Close()
|
||||
return Decode(file, opts...)
|
||||
}
|
||||
|
||||
type encodeConfig struct {
|
||||
jpegQuality int
|
||||
gifNumColors int
|
||||
gifQuantizer draw.Quantizer
|
||||
gifDrawer draw.Drawer
|
||||
pngCompressionLevel png.CompressionLevel
|
||||
}
|
||||
|
||||
var defaultEncodeConfig = encodeConfig{
|
||||
jpegQuality: 95,
|
||||
gifNumColors: 256,
|
||||
gifQuantizer: nil,
|
||||
gifDrawer: nil,
|
||||
pngCompressionLevel: png.DefaultCompression,
|
||||
}
|
||||
|
||||
// EncodeOption sets an optional parameter for the Encode and Save functions.
|
||||
type EncodeOption func(*encodeConfig)
|
||||
|
||||
// JPEGQuality returns an EncodeOption that sets the output JPEG quality.
|
||||
// Quality ranges from 1 to 100 inclusive, higher is better. Default is 95.
|
||||
func JPEGQuality(quality int) EncodeOption {
|
||||
return func(c *encodeConfig) {
|
||||
c.jpegQuality = quality
|
||||
}
|
||||
}
|
||||
|
||||
// GIFNumColors returns an EncodeOption that sets the maximum number of colors
|
||||
// used in the GIF-encoded image. It ranges from 1 to 256. Default is 256.
|
||||
func GIFNumColors(numColors int) EncodeOption {
|
||||
return func(c *encodeConfig) {
|
||||
c.gifNumColors = numColors
|
||||
}
|
||||
}
|
||||
|
||||
// GIFQuantizer returns an EncodeOption that sets the quantizer that is used to produce
|
||||
// a palette of the GIF-encoded image.
|
||||
func GIFQuantizer(quantizer draw.Quantizer) EncodeOption {
|
||||
return func(c *encodeConfig) {
|
||||
c.gifQuantizer = quantizer
|
||||
}
|
||||
}
|
||||
|
||||
// GIFDrawer returns an EncodeOption that sets the drawer that is used to convert
|
||||
// the source image to the desired palette of the GIF-encoded image.
|
||||
func GIFDrawer(drawer draw.Drawer) EncodeOption {
|
||||
return func(c *encodeConfig) {
|
||||
c.gifDrawer = drawer
|
||||
}
|
||||
}
|
||||
|
||||
// PNGCompressionLevel returns an EncodeOption that sets the compression level
|
||||
// of the PNG-encoded image. Default is png.DefaultCompression.
|
||||
func PNGCompressionLevel(level png.CompressionLevel) EncodeOption {
|
||||
return func(c *encodeConfig) {
|
||||
c.pngCompressionLevel = level
|
||||
}
|
||||
}
|
||||
|
||||
// Encode writes the image img to w in the specified format (JPEG, PNG, GIF, TIFF or BMP).
|
||||
func Encode(w io.Writer, img image.Image, format Format, opts ...EncodeOption) error {
|
||||
cfg := defaultEncodeConfig
|
||||
for _, option := range opts {
|
||||
option(&cfg)
|
||||
}
|
||||
|
||||
var err error
|
||||
switch format {
|
||||
case JPEG:
|
||||
var rgba *image.RGBA
|
||||
if nrgba, ok := img.(*image.NRGBA); ok {
|
||||
if nrgba.Opaque() {
|
||||
rgba = &image.RGBA{
|
||||
Pix: nrgba.Pix,
|
||||
Stride: nrgba.Stride,
|
||||
Rect: nrgba.Rect,
|
||||
}
|
||||
}
|
||||
}
|
||||
if rgba != nil {
|
||||
err = jpeg.Encode(w, rgba, &jpeg.Options{Quality: cfg.jpegQuality})
|
||||
} else {
|
||||
err = jpeg.Encode(w, img, &jpeg.Options{Quality: cfg.jpegQuality})
|
||||
}
|
||||
|
||||
case PNG:
|
||||
enc := png.Encoder{CompressionLevel: cfg.pngCompressionLevel}
|
||||
err = enc.Encode(w, img)
|
||||
|
||||
case GIF:
|
||||
err = gif.Encode(w, img, &gif.Options{
|
||||
NumColors: cfg.gifNumColors,
|
||||
Quantizer: cfg.gifQuantizer,
|
||||
Drawer: cfg.gifDrawer,
|
||||
})
|
||||
|
||||
case TIFF:
|
||||
err = tiff.Encode(w, img, &tiff.Options{Compression: tiff.Deflate, Predictor: true})
|
||||
|
||||
case BMP:
|
||||
err = bmp.Encode(w, img)
|
||||
|
||||
default:
|
||||
err = ErrUnsupportedFormat
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
// Save saves the image to file with the specified filename.
|
||||
// The format is determined from the filename extension:
|
||||
// "jpg" (or "jpeg"), "png", "gif", "tif" (or "tiff") and "bmp" are supported.
|
||||
//
|
||||
// Examples:
|
||||
//
|
||||
// // Save the image as PNG.
|
||||
// err := imaging.Save(img, "out.png")
|
||||
//
|
||||
// // Save the image as JPEG with optional quality parameter set to 80.
|
||||
// err := imaging.Save(img, "out.jpg", imaging.JPEGQuality(80))
|
||||
//
|
||||
func Save(img image.Image, filename string, opts ...EncodeOption) (err error) {
|
||||
f, err := FormatFromFilename(filename)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
file, err := fs.Create(filename)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
defer func() {
|
||||
cerr := file.Close()
|
||||
if err == nil {
|
||||
err = cerr
|
||||
}
|
||||
}()
|
||||
|
||||
return Encode(file, img, f, opts...)
|
||||
}
|
||||
|
||||
// orientation is an EXIF flag that specifies the transformation
|
||||
// that should be applied to image to display it correctly.
|
||||
type orientation int
|
||||
|
||||
const (
|
||||
orientationUnspecified = 0
|
||||
orientationNormal = 1
|
||||
orientationFlipH = 2
|
||||
orientationRotate180 = 3
|
||||
orientationFlipV = 4
|
||||
orientationTranspose = 5
|
||||
orientationRotate270 = 6
|
||||
orientationTransverse = 7
|
||||
orientationRotate90 = 8
|
||||
)
|
||||
|
||||
// readOrientation tries to read the orientation EXIF flag from image data in r.
|
||||
// If the EXIF data block is not found or the orientation flag is not found
|
||||
// or any other error occures while reading the data, it returns the
|
||||
// orientationUnspecified (0) value.
|
||||
func readOrientation(r io.Reader) orientation {
|
||||
const (
|
||||
markerSOI = 0xffd8
|
||||
markerAPP1 = 0xffe1
|
||||
exifHeader = 0x45786966
|
||||
byteOrderBE = 0x4d4d
|
||||
byteOrderLE = 0x4949
|
||||
orientationTag = 0x0112
|
||||
)
|
||||
|
||||
// Check if JPEG SOI marker is present.
|
||||
var soi uint16
|
||||
if err := binary.Read(r, binary.BigEndian, &soi); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
if soi != markerSOI {
|
||||
return orientationUnspecified // Missing JPEG SOI marker.
|
||||
}
|
||||
|
||||
// Find JPEG APP1 marker.
|
||||
for {
|
||||
var marker, size uint16
|
||||
if err := binary.Read(r, binary.BigEndian, &marker); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
if err := binary.Read(r, binary.BigEndian, &size); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
if marker>>8 != 0xff {
|
||||
return orientationUnspecified // Invalid JPEG marker.
|
||||
}
|
||||
if marker == markerAPP1 {
|
||||
break
|
||||
}
|
||||
if size < 2 {
|
||||
return orientationUnspecified // Invalid block size.
|
||||
}
|
||||
if _, err := io.CopyN(ioutil.Discard, r, int64(size-2)); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
}
|
||||
|
||||
// Check if EXIF header is present.
|
||||
var header uint32
|
||||
if err := binary.Read(r, binary.BigEndian, &header); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
if header != exifHeader {
|
||||
return orientationUnspecified
|
||||
}
|
||||
if _, err := io.CopyN(ioutil.Discard, r, 2); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
|
||||
// Read byte order information.
|
||||
var (
|
||||
byteOrderTag uint16
|
||||
byteOrder binary.ByteOrder
|
||||
)
|
||||
if err := binary.Read(r, binary.BigEndian, &byteOrderTag); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
switch byteOrderTag {
|
||||
case byteOrderBE:
|
||||
byteOrder = binary.BigEndian
|
||||
case byteOrderLE:
|
||||
byteOrder = binary.LittleEndian
|
||||
default:
|
||||
return orientationUnspecified // Invalid byte order flag.
|
||||
}
|
||||
if _, err := io.CopyN(ioutil.Discard, r, 2); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
|
||||
// Skip the EXIF offset.
|
||||
var offset uint32
|
||||
if err := binary.Read(r, byteOrder, &offset); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
if offset < 8 {
|
||||
return orientationUnspecified // Invalid offset value.
|
||||
}
|
||||
if _, err := io.CopyN(ioutil.Discard, r, int64(offset-8)); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
|
||||
// Read the number of tags.
|
||||
var numTags uint16
|
||||
if err := binary.Read(r, byteOrder, &numTags); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
|
||||
// Find the orientation tag.
|
||||
for i := 0; i < int(numTags); i++ {
|
||||
var tag uint16
|
||||
if err := binary.Read(r, byteOrder, &tag); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
if tag != orientationTag {
|
||||
if _, err := io.CopyN(ioutil.Discard, r, 10); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
continue
|
||||
}
|
||||
if _, err := io.CopyN(ioutil.Discard, r, 6); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
var val uint16
|
||||
if err := binary.Read(r, byteOrder, &val); err != nil {
|
||||
return orientationUnspecified
|
||||
}
|
||||
if val < 1 || val > 8 {
|
||||
return orientationUnspecified // Invalid tag value.
|
||||
}
|
||||
return orientation(val)
|
||||
}
|
||||
return orientationUnspecified // Missing orientation tag.
|
||||
}
|
||||
|
||||
// fixOrientation applies a transform to img corresponding to the given orientation flag.
|
||||
func fixOrientation(img image.Image, o orientation) image.Image {
|
||||
switch o {
|
||||
case orientationNormal:
|
||||
case orientationFlipH:
|
||||
img = FlipH(img)
|
||||
case orientationFlipV:
|
||||
img = FlipV(img)
|
||||
case orientationRotate90:
|
||||
img = Rotate90(img)
|
||||
case orientationRotate180:
|
||||
img = Rotate180(img)
|
||||
case orientationRotate270:
|
||||
img = Rotate270(img)
|
||||
case orientationTranspose:
|
||||
img = Transpose(img)
|
||||
case orientationTransverse:
|
||||
img = Transverse(img)
|
||||
}
|
||||
return img
|
||||
}
|
||||
34
vendor/github.com/disintegration/imaging/tools.go
generated
vendored
34
vendor/github.com/disintegration/imaging/tools.go
generated
vendored
@ -1,10 +1,44 @@
|
||||
package imaging
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"image"
|
||||
"image/color"
|
||||
"math"
|
||||
)
|
||||
|
||||
// New creates a new image with the specified width and height, and fills it with the specified color.
|
||||
func New(width, height int, fillColor color.Color) *image.NRGBA {
|
||||
if width <= 0 || height <= 0 {
|
||||
return &image.NRGBA{}
|
||||
}
|
||||
|
||||
c := color.NRGBAModel.Convert(fillColor).(color.NRGBA)
|
||||
if (c == color.NRGBA{0, 0, 0, 0}) {
|
||||
return image.NewNRGBA(image.Rect(0, 0, width, height))
|
||||
}
|
||||
|
||||
return &image.NRGBA{
|
||||
Pix: bytes.Repeat([]byte{c.R, c.G, c.B, c.A}, width*height),
|
||||
Stride: 4 * width,
|
||||
Rect: image.Rect(0, 0, width, height),
|
||||
}
|
||||
}
|
||||
|
||||
// Clone returns a copy of the given image.
|
||||
func Clone(img image.Image) *image.NRGBA {
|
||||
src := newScanner(img)
|
||||
dst := image.NewNRGBA(image.Rect(0, 0, src.w, src.h))
|
||||
size := src.w * 4
|
||||
parallel(0, src.h, func(ys <-chan int) {
|
||||
for y := range ys {
|
||||
i := y * dst.Stride
|
||||
src.scan(0, y, src.w, y+1, dst.Pix[i:i+size])
|
||||
}
|
||||
})
|
||||
return dst
|
||||
}
|
||||
|
||||
// Anchor is the anchor point for image alignment.
|
||||
type Anchor int
|
||||
|
||||
|
||||
Reference in New Issue
Block a user