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adjust.go
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adjust.go
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package images
import (
"bytes"
"errors"
"image"
"io/ioutil"
"os"
)
const (
maxChatMessageImageSize = 400000
resizeTargetImageSize = 350000
idealTargetImageSize = 50000
)
func OpenAndAdjustImage(inputImage CroppedImage, crop bool) ([]byte, error) {
file, err := os.Open(inputImage.ImagePath)
if err != nil {
return nil, err
}
defer file.Close()
payload, err := ioutil.ReadAll(file)
if err != nil {
return nil, err
}
img, err := Decode(inputImage.ImagePath)
if err != nil {
return nil, err
}
if crop {
cropRect := image.Rectangle{
Min: image.Point{X: inputImage.X, Y: inputImage.Y},
Max: image.Point{X: inputImage.X + inputImage.Width, Y: inputImage.Y + inputImage.Height},
}
img, err = Crop(img, cropRect)
if err != nil {
return nil, err
}
}
bb := bytes.NewBuffer([]byte{})
err = CompressToFileLimits(bb, img, FileSizeLimits{Ideal: idealTargetImageSize, Max: resizeTargetImageSize})
if err != nil {
return nil, err
}
// We keep the smallest one
if len(payload) > len(bb.Bytes()) {
payload = bb.Bytes()
}
if len(payload) > maxChatMessageImageSize {
return nil, errors.New("image too large")
}
return payload, nil
}