mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-11-29 09:31:11 -05:00
94 lines
2.6 KiB
Go
94 lines
2.6 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
|
|
// Use of this source code is governed by a MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package avatar
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"image"
|
|
"image/color/palette"
|
|
// Enable PNG support:
|
|
_ "image/png"
|
|
"math/rand"
|
|
"time"
|
|
|
|
"code.gitea.io/gitea/modules/setting"
|
|
|
|
"github.com/issue9/identicon"
|
|
"github.com/nfnt/resize"
|
|
"github.com/oliamb/cutter"
|
|
)
|
|
|
|
// AvatarSize returns avatar's size
|
|
const AvatarSize = 290
|
|
|
|
// RandomImageSize generates and returns a random avatar image unique to input data
|
|
// in custom size (height and width).
|
|
func RandomImageSize(size int, data []byte) (image.Image, error) {
|
|
randExtent := len(palette.WebSafe) - 32
|
|
rand.Seed(time.Now().UnixNano())
|
|
colorIndex := rand.Intn(randExtent)
|
|
backColorIndex := colorIndex - 1
|
|
if backColorIndex < 0 {
|
|
backColorIndex = randExtent - 1
|
|
}
|
|
|
|
// Define size, background, and forecolor
|
|
imgMaker, err := identicon.New(size,
|
|
palette.WebSafe[backColorIndex], palette.WebSafe[colorIndex:colorIndex+32]...)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("identicon.New: %v", err)
|
|
}
|
|
return imgMaker.Make(data), nil
|
|
}
|
|
|
|
// RandomImage generates and returns a random avatar image unique to input data
|
|
// in default size (height and width).
|
|
func RandomImage(data []byte) (image.Image, error) {
|
|
return RandomImageSize(AvatarSize, data)
|
|
}
|
|
|
|
// Prepare accepts a byte slice as input, validates it contains an image of an
|
|
// acceptable format, and crops and resizes it appropriately.
|
|
func Prepare(data []byte) (*image.Image, error) {
|
|
imgCfg, _, err := image.DecodeConfig(bytes.NewReader(data))
|
|
if err != nil {
|
|
return nil, fmt.Errorf("DecodeConfig: %v", err)
|
|
}
|
|
if imgCfg.Width > setting.AvatarMaxWidth {
|
|
return nil, fmt.Errorf("Image width is too large: %d > %d", imgCfg.Width, setting.AvatarMaxWidth)
|
|
}
|
|
if imgCfg.Height > setting.AvatarMaxHeight {
|
|
return nil, fmt.Errorf("Image height is too large: %d > %d", imgCfg.Height, setting.AvatarMaxHeight)
|
|
}
|
|
|
|
img, _, err := image.Decode(bytes.NewReader(data))
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Decode: %v", err)
|
|
}
|
|
|
|
if imgCfg.Width != imgCfg.Height {
|
|
var newSize, ax, ay int
|
|
if imgCfg.Width > imgCfg.Height {
|
|
newSize = imgCfg.Height
|
|
ax = (imgCfg.Width - imgCfg.Height) / 2
|
|
} else {
|
|
newSize = imgCfg.Width
|
|
ay = (imgCfg.Height - imgCfg.Width) / 2
|
|
}
|
|
|
|
img, err = cutter.Crop(img, cutter.Config{
|
|
Width: newSize,
|
|
Height: newSize,
|
|
Anchor: image.Point{ax, ay},
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
img = resize.Resize(AvatarSize, AvatarSize, img, resize.Bilinear)
|
|
return &img, nil
|
|
}
|