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// 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.NearestNeighbor)
return &img, nil
}
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