/
imageversion.go
111 lines (101 loc) · 2.32 KB
/
imageversion.go
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package media
import (
"errors"
"image"
"image/jpeg"
"image/png"
"github.com/ungerik/go-start/model"
"github.com/ungerik/go-start/view"
)
type ImageVersion struct {
image *Image
ID model.String `bson:",omitempty"`
Filename model.String
ContentType model.String
SourceRect ModelRect
OutsideColor model.Color
Width model.Int
Height model.Int
Grayscale model.Bool
}
func (self *ImageVersion) FileURL() view.URL {
return view.NewURLWithArgs(FileView, self.ID.Get(), self.Filename.Get())
}
// AspectRatio returns Width / Height
func (self *ImageVersion) AspectRatio() float64 {
return float64(self.Width) / float64(self.Height)
}
func (self *ImageVersion) SaveImageData(data []byte) error {
writer, id, err := Config.Backend.FileWriter(self.Filename.Get(), self.ContentType.Get())
if err != nil {
return err
}
_, err = writer.Write(data)
if err != nil {
writer.Close()
return err
}
err = writer.Close()
if err == nil {
self.ID.Set(id)
}
return err
}
func (self *ImageVersion) SaveImage(im image.Image) error {
writer, id, err := Config.Backend.FileWriter(self.Filename.Get(), self.ContentType.Get())
if err != nil {
return err
}
switch self.ContentType {
case "image/jpeg":
err = jpeg.Encode(writer, im, nil)
case "image/png":
err = png.Encode(writer, im)
default:
return errors.New("Can't save content-type: " + self.ContentType.Get())
}
if err != nil {
writer.Close()
return err
}
err = writer.Close()
if err == nil {
self.ID.Set(id)
}
return err
}
func (self *ImageVersion) LoadImage() (image.Image, error) {
reader, _, _, err := Config.Backend.FileReader(self.ID.Get())
if err != nil {
return nil, err
}
im, _, err := image.Decode(reader)
if err != nil {
reader.Close()
return nil, err
}
err = reader.Close()
if err != nil {
return nil, err
}
return im, nil
}
func (self *ImageVersion) View(class string) *view.Image {
return &view.Image{
URL: self.FileURL(),
Width: self.Width.GetInt(),
Height: self.Height.GetInt(),
Title: self.image.Title.Get(),
Class: class,
}
}
func (self *ImageVersion) LinkedView(imageClass, linkClass string) *view.Link {
return &view.Link{
Model: &view.StringLink{
Url: self.image.Link.Get(),
Title: self.image.Title.Get(),
Content: self.View(imageClass),
},
Class: linkClass,
}
}