func (fi *FileInfo) createThumb(buffer *bytes.Buffer, c context.Context) {
if imageTypes.MatchString(fi.Type) {
src, _, err := image.Decode(bytes.NewReader(buffer.Bytes()))
check(err)
filter := gift.New(gift.ResizeToFit(
THUMB_MAX_WIDTH,
THUMB_MAX_HEIGHT,
gift.LanczosResampling,
))
dst := image.NewNRGBA(filter.Bounds(src.Bounds()))
filter.Draw(dst, src)
buffer.Reset()
bWriter := bufio.NewWriter(buffer)
switch fi.Type {
case "image/jpeg", "image/pjpeg":
err = jpeg.Encode(bWriter, dst, nil)
case "image/gif":
err = gif.Encode(bWriter, dst, nil)
default:
err = png.Encode(bWriter, dst)
}
check(err)
bWriter.Flush()
thumbnailKey := fi.Key + thumbSuffix + filepath.Ext(fi.Name)
item := &memcache.Item{
Key: thumbnailKey,
Value: buffer.Bytes(),
}
err = memcache.Set(c, item)
check(err)
fi.ThumbnailKey = thumbnailKey
}
}
func getimage(image_path string, w, h int, resized bool) (image.Image, error) {
f, err := os.Open(image_path)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return nil, err
}
defer f.Close()
img, _, err := image.Decode(f)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return nil, err
}
if resized {
g := gift.New(gift.ResizeToFit(w, h, gift.BoxResampling))
res := image.NewRGBA(g.Bounds(img.Bounds()))
g.Draw(res, img)
return res, nil
}
return img, nil
}
func (prc *ResizeProcessor) getFilter(width, height int, params imageserver.Params) (gift.Filter, error) {
rsp, err := prc.getResampling(params)
if err != nil {
return nil, err
}
if !params.Has("mode") || width == 0 || height == 0 {
return gift.Resize(width, height, rsp), nil
}
mode, err := params.GetString("mode")
if err != nil {
return nil, err
}
switch mode {
case "fit":
return gift.ResizeToFit(width, height, rsp), nil
case "fill":
return gift.ResizeToFill(width, height, rsp, gift.CenterAnchor), nil
}
return nil, &imageserver.ParamError{Param: "mode", Message: "invalid value"}
}