/
addbackground.go
82 lines (61 loc) · 1.83 KB
/
addbackground.go
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package filters
import (
"github.com/h2non/bimg"
log "github.com/sirupsen/logrus"
"github.com/zalando-stups/skrop/parse"
"github.com/zalando/skipper/filters"
)
const (
// AddBackgroundName is the name of the filter
AddBackgroundName = "addBackground"
)
type addBackground bimg.Color
// NewAddBackground creates a new add backgroud filter
func NewAddBackground() filters.Spec {
return &addBackground{}
}
func (s *addBackground) Name() string {
return AddBackgroundName
}
func (s *addBackground) CreateOptions(imageContext *ImageFilterContext) (*bimg.Options, error) {
log.Debug("Create options for adding background ", s)
if imageContext.Image.Type() != "png" {
return &bimg.Options{}, nil
}
backgroundColor := bimg.Color{R: s.R, G: s.G, B: s.B}
return &bimg.Options{
Background: backgroundColor}, nil
}
func (s *addBackground) CanBeMerged(other *bimg.Options, self *bimg.Options) bool {
zero := bimg.Color{}
//it can be merged if the background was not set (in options or in self) or if they are set to the same value
return other.Background == zero || other.Background == self.Background
}
func (s *addBackground) Merge(other *bimg.Options, self *bimg.Options) *bimg.Options {
other.Background = self.Background
return other
}
func (s *addBackground) CreateFilter(args []interface{}) (filters.Filter, error) {
if len(args) != 3 {
return nil, filters.ErrInvalidFilterParameters
}
var err error
f := &addBackground{}
f.R, err = parse.EskipUint8Arg(args[0])
if err != nil {
return nil, err
}
f.G, err = parse.EskipUint8Arg(args[1])
if err != nil {
return nil, err
}
f.B, err = parse.EskipUint8Arg(args[2])
if err != nil {
return nil, err
}
return f, nil
}
func (s *addBackground) Request(ctx filters.FilterContext) {}
func (s *addBackground) Response(ctx filters.FilterContext) {
HandleImageResponse(ctx, s)
}