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resize.go
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resize.go
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package effect
import (
"context"
"image"
"github.com/disintegration/imaging"
"github.com/talento90/imgart/imgart"
)
type resize struct {
effect
}
// NewResize creates an Effect that resizes an image
func NewResize() imgart.Effect {
return &resize{
effect: effect{
id: "resize",
description: "Resize - resizes an image",
parameters: imgart.Parameters{
"width": imgart.Parameter{
Description: "Width in px",
Required: true,
Example: 500,
Type: "integer",
},
"height": imgart.Parameter{
Description: "Height in px",
Required: true,
Example: 350,
Type: "integer",
},
"filter": imgart.Parameter{
Description: "Resample filter",
Required: false,
Example: "linear",
Type: "string",
Default: "linear",
Values: filtersList,
},
},
},
}
}
func (r *resize) Transform(ctx context.Context, img image.Image, params map[string]interface{}) (image.Image, error) {
width, err := integerBinder("width", params)
if err != nil {
return nil, err
}
height, err := integerBinder("height", params)
if err != nil {
return nil, err
}
filter, err := filterBinder("filter", params)
if err != nil {
filter = imaging.Linear
}
img = imaging.Resize(img, width, height, filter)
return img, ctx.Err()
}