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// Copyright 2014 The Gogs Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package avatar
import (
"bytes"
"fmt"
"image"
"image/color"
_ "image/gif" // for processing gif images
_ "image/jpeg" // for processing jpeg images
_ "image/png" // for processing png images
"code.gitea.io/gitea/modules/avatar/identicon"
"code.gitea.io/gitea/modules/setting"
"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) {
// we use white as background, and use dark colors to draw blocks
imgMaker, err := identicon.New(size, color.White, identicon.DarkColors...)
if err != nil {
return nil, fmt.Errorf("identicon.New: %w", 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: %w", err)
}
if imgCfg.Width > setting.Avatar.MaxWidth {
return nil, fmt.Errorf("Image width is too large: %d > %d", imgCfg.Width, setting.Avatar.MaxWidth)
}
if imgCfg.Height > setting.Avatar.MaxHeight {
return nil, fmt.Errorf("Image height is too large: %d > %d", imgCfg.Height, setting.Avatar.MaxHeight)
}
img, _, err := image.Decode(bytes.NewReader(data))
if err != nil {
return nil, fmt.Errorf("Decode: %w", 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
}
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