140 lines
4.7 KiB
Go
140 lines
4.7 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package avatar
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import (
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"bytes"
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"errors"
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"fmt"
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"image"
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"image/color"
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"image/png"
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_ "image/gif" // for processing gif images
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_ "image/jpeg" // for processing jpeg images
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"code.gitea.io/gitea/modules/avatar/identicon"
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"code.gitea.io/gitea/modules/setting"
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"golang.org/x/image/draw"
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_ "golang.org/x/image/webp" // for processing webp images
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)
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// DefaultAvatarSize is the target CSS pixel size for avatar generation. It is
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// multiplied by setting.Avatar.RenderedSizeFactor and the resulting size is the
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// usual size of avatar image saved on server, unless the original file is smaller
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// than the size after resizing.
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const DefaultAvatarSize = 256
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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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// we use white as background, and use dark colors to draw blocks
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imgMaker, err := identicon.New(size, color.White, identicon.DarkColors...)
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if err != nil {
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return nil, fmt.Errorf("identicon.New: %w", 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(DefaultAvatarSize*setting.Avatar.RenderedSizeFactor, data)
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}
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// processAvatarImage process the avatar image data, crop and resize it if necessary.
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// the returned data could be the original image if no processing is needed.
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func processAvatarImage(data []byte, maxOriginSize int64) ([]byte, error) {
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imgCfg, imgType, err := image.DecodeConfig(bytes.NewReader(data))
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if err != nil {
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return nil, fmt.Errorf("image.DecodeConfig: %w", err)
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}
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// for safety, only accept known types explicitly
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if imgType != "png" && imgType != "jpeg" && imgType != "gif" && imgType != "webp" {
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return nil, errors.New("unsupported avatar image type")
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}
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// do not process image which is too large, it would consume too much memory
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if imgCfg.Width > setting.Avatar.MaxWidth {
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return nil, fmt.Errorf("image width is too large: %d > %d", imgCfg.Width, setting.Avatar.MaxWidth)
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}
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if imgCfg.Height > setting.Avatar.MaxHeight {
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return nil, fmt.Errorf("image height is too large: %d > %d", imgCfg.Height, setting.Avatar.MaxHeight)
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}
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// If the origin is small enough, just use it, then APNG could be supported,
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// otherwise, if the image is processed later, APNG loses animation.
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// And one more thing, webp is not fully supported, for animated webp, image.DecodeConfig works but Decode fails.
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// So for animated webp, if the uploaded file is smaller than maxOriginSize, it will be used, if it's larger, there will be an error.
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if len(data) < int(maxOriginSize) {
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return data, nil
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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("image.Decode: %w", err)
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}
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// try to crop and resize the origin image if necessary
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img = cropSquare(img)
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targetSize := DefaultAvatarSize * setting.Avatar.RenderedSizeFactor
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img = scale(img, targetSize, targetSize, draw.BiLinear)
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// try to encode the cropped/resized image to png
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bs := bytes.Buffer{}
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if err = png.Encode(&bs, img); err != nil {
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return nil, err
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}
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resized := bs.Bytes()
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// usually the png compression is not good enough, use the original image (no cropping/resizing) if the origin is smaller
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if len(data) <= len(resized) {
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return data, nil
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}
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return resized, nil
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}
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// ProcessAvatarImage process the avatar image data, crop and resize it if necessary.
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// the returned data could be the original image if no processing is needed.
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func ProcessAvatarImage(data []byte) ([]byte, error) {
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return processAvatarImage(data, setting.Avatar.MaxOriginSize)
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}
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// scale resizes the image to width x height using the given scaler.
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func scale(src image.Image, width, height int, scale draw.Scaler) image.Image {
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rect := image.Rect(0, 0, width, height)
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dst := image.NewRGBA(rect)
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scale.Scale(dst, rect, src, src.Bounds(), draw.Over, nil)
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return dst
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}
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// cropSquare crops the largest square image from the center of the image.
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// If the image is already square, it is returned unchanged.
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func cropSquare(src image.Image) image.Image {
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bounds := src.Bounds()
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if bounds.Dx() == bounds.Dy() {
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return src
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}
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var rect image.Rectangle
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if bounds.Dx() > bounds.Dy() {
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// width > height
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size := bounds.Dy()
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rect = image.Rect((bounds.Dx()-size)/2, 0, (bounds.Dx()+size)/2, size)
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} else {
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// width < height
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size := bounds.Dx()
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rect = image.Rect(0, (bounds.Dy()-size)/2, size, (bounds.Dy()+size)/2)
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}
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dst := image.NewRGBA(rect)
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draw.Draw(dst, rect, src, rect.Min, draw.Src)
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return dst
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}
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