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add trim option to remove solid color borders

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Fixes #441
This commit is contained in:
Vetle Leinonen-Roeim 2025-03-28 10:11:43 +01:00 • committed by Will Norris
parent 572ad2db78
commit c361000ff4
3 changed files with 135 additions and 2 deletions
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20
data.go
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@ -30,6 +30,7 @@ const (
optCropWidth = "cw"
optCropHeight = "ch"
optSmartCrop = "sc"
optTrim = "trim"
)
// URLError reports a malformed URL error.
@ -80,6 +81,9 @@ type Options struct {
// Automatically find good crop points based on image content.
SmartCrop bool
// If true, automatically trim pixels of the same color around the edges
Trim bool
}
func (o Options) String() string {
@ -123,6 +127,9 @@ func (o Options) String() string {
if o.SmartCrop {
opts = append(opts, optSmartCrop)
}
if o.Trim {
opts = append(opts, optTrim)
}
sort.Strings(opts)
return strings.Join(opts, ",")
}
@ -132,7 +139,7 @@ func (o Options) String() string {
// the presence of other fields (like Fit). A non-empty Format value is
// assumed to involve a transformation.
func (o Options) transform() bool {
return o.Width != 0 || o.Height != 0 || o.Rotate != 0 || o.FlipHorizontal || o.FlipVertical || o.Quality != 0 || o.Format != "" || o.CropX != 0 || o.CropY != 0 || o.CropWidth != 0 || o.CropHeight != 0
return o.Width != 0 || o.Height != 0 || o.Rotate != 0 || o.FlipHorizontal || o.FlipVertical || o.Quality != 0 || o.Format != "" || o.CropX != 0 || o.CropY != 0 || o.CropWidth != 0 || o.CropHeight != 0 || o.Trim
}
// ParseOptions parses str as a list of comma separated transformation options.
@ -207,7 +214,7 @@ func (o Options) transform() bool {
//
// # Format
//
// The "jpeg", "png", and "tiff" options can be used to specify the desired
// The "jpeg", "png", and "tiff" options can be used to specify the desired
// image format of the proxied image.
//
// # Signature
@ -219,6 +226,13 @@ func (o Options) transform() bool {
// See https://github.com/willnorris/imageproxy/blob/master/docs/url-signing.md
// for examples of generating signatures.
//
// # Trim
//
// The "trim" option will automatically trim pixels of the same color around
// the edges of the image. This is useful for removing borders from images
// that have been resized or cropped. The trim option is applied before other
// options such as cropping or resizing.
//
// Examples
//
// 0x0 - no resizing
@ -251,6 +265,8 @@ func ParseOptions(str string) Options {
options.Format = opt
case opt == optSmartCrop:
options.SmartCrop = true
case opt == optTrim:
options.Trim = true
case strings.HasPrefix(opt, optRotatePrefix):
value := strings.TrimPrefix(opt, optRotatePrefix)
options.Rotate, _ = strconv.Atoi(value)