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