func resizeThumbnail(from *bytes.Buffer, spec *ThumbnailSpec) (to io.Reader, w int, h int, err error) {
src, name, err := image.Decode(from)
if err != nil {
return
}
srcB := src.Bounds()
var dst image.Image
if spec.CropToSquare && srcB.Dx() != srcB.Dy() {
var rect image.Rectangle
if srcB.Dx() > srcB.Dy() {
x1 := (srcB.Dx() - srcB.Dy()) / 2
x2 := srcB.Dx() - x1
rect = image.Rect(x1, 0, x2, srcB.Dy())
} else {
rect = image.Rect(0, 0, srcB.Dx(), srcB.Dx())
}
w = spec.Height
if (spec.Height > spec.Width && spec.Width != 0) || spec.Height == 0 {
w = spec.Width
}
h = w
cropedImg := imaging.Crop(src, rect)
rect = cropedImg.Bounds()
dst = resize.Resize(cropedImg, rect, w, h)
} else {
w, h = spec.CalculateRect(srcB, spec.CropToSquare)
if w >= srcB.Dx() || h >= srcB.Dy() {
w, h = srcB.Dx(), srcB.Dy()
}
rect := image.Rect(0, 0, srcB.Dx(), srcB.Dy())
dst = resize.Resize(src, rect, w, h)
}
var buf bytes.Buffer
switch name {
case "jpeg":
jpeg.Encode(&buf, dst, &jpeg.Options{95})
case "png":
png.Encode(&buf, dst)
case "gif":
jpeg.Encode(&buf, dst, &jpeg.Options{95})
case "bmp":
jpeg.Encode(&buf, dst, &jpeg.Options{95})
}
to = &buf
return
}
func resizeThumbnail(from *bytes.Buffer, spec *ThumbnailSpec) (to io.Reader, w int, h int, err error) {
src, name, err := image.Decode(from)
if err != nil {
return
}
srcB := src.Bounds()
w, h = spec.CalculateRect(srcB)
rect := image.Rect(0, 0, srcB.Dx(), srcB.Dy())
dst := resize.Resize(src, rect, w, h)
var buf bytes.Buffer
switch name {
case "jpeg":
jpeg.Encode(&buf, dst, &jpeg.Options{95})
case "png":
png.Encode(&buf, dst)
case "gif":
jpeg.Encode(&buf, dst, &jpeg.Options{95})
}
to = &buf
return
}