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Added constants for EXIF orientations

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This commit is contained in:
hmhealey
2015-09-18 18:00:09 -04:00
parent 48110020af
commit 4b177a6ed5
1 changed files with 31 additions and 9 deletions
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40
api/file.go
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@@ -33,6 +33,27 @@ import (
"time"
)
const (
/*
EXIF Image Orientations
1 2 3 4 5 6 7 8
888888 888888 88 88 8888888888 88 88 8888888888
88 88 88 88 88 88 88 88 88 88 88 88
8888 8888 8888 8888 88 8888888888 8888888888 88
88 88 88 88
88 88 888888 888888
*/
Upright = 1
UprightMirrored = 2
UpsideDown = 3
UpsideDownMirrored = 4
RotatedCWMirrored = 5
RotatedCCW = 6
RotatedCCWMirrored = 7
RotatedCW = 8
)
var fileInfoCache *utils.Cache = utils.NewLru(1000)
func InitFile(r *mux.Router) {
@@ -154,9 +175,10 @@ func fireAndForgetHandleImages(filenames []string, fileData [][]byte, teamId, ch
// Create a temporary image that will be manipulated and then used to make the thumbnail and preview image
var temp *image.RGBA
if orientation >= 1 && orientation <= 4 {
switch orientation {
case Upright, UprightMirrored, UpsideDown, UpsideDownMirrored:
temp = image.NewRGBA(img.Bounds())
} else {
case RotatedCCW, RotatedCCWMirrored, RotatedCW, RotatedCWMirrored:
bounds := img.Bounds()
temp = image.NewRGBA(image.Rect(bounds.Min.Y, bounds.Min.X, bounds.Max.Y, bounds.Max.X))
@@ -168,25 +190,25 @@ func fireAndForgetHandleImages(filenames []string, fileData [][]byte, teamId, ch
// Copy the original image onto the temporary one while rotating it as necessary
switch orientation {
case 3, 4:
case UpsideDown, UpsideDownMirrored:
// rotate 180 degrees
err := graphics.Rotate(temp, img, &graphics.RotateOptions{Angle: math.Pi})
if err != nil {
l4g.Error("Unable to rotate image")
}
case 5, 8:
case RotatedCW, RotatedCWMirrored:
// rotate 90 degrees CCW
graphics.Rotate(temp, img, &graphics.RotateOptions{Angle: 3 * math.Pi / 2})
if err != nil {
l4g.Error("Unable to rotate image")
}
case 6, 7:
case RotatedCCW, RotatedCCWMirrored:
// rotate 90 degrees CW
graphics.Rotate(temp, img, &graphics.RotateOptions{Angle: math.Pi / 2})
if err != nil {
l4g.Error("Unable to rotate image")
}
case 1, 2:
case Upright, UprightMirrored:
draw.Draw(temp, temp.Bounds(), img, img.Bounds().Min, draw.Over)
}
@@ -250,14 +272,14 @@ func fireAndForgetHandleImages(filenames []string, fileData [][]byte, teamId, ch
func getImageOrientation(imageData []byte) (int, error) {
if exifData, err := exif.Decode(bytes.NewReader(imageData)); err != nil {
return 1, err
return Upright, err
} else {
if tag, err := exifData.Get("Orientation"); err != nil {
return 1, err
return Upright, err
} else {
orientation, err := tag.Int(0)
if err != nil {
return 1, err
return Upright, err
} else {
return orientation, nil
}