hugo/resource/image.go
Bjørn Erik Pedersen 78f8475a05 Fix Resource output in multihost setups
In Hugo 0.46 we made the output of what you get from resources.Get and similar static, i.e. language agnostic. This makes total sense, as it is wasteful and time-consuming to do SASS/SCSS/PostCSS processing for lots of languages when the output is lots of duplicates with different filenames.

But since we now output the result once only, this had a negative side effect for multihost setups: We publish the resource once only to the root folder (i.e. not to the language "domain folder").

This commit removes the language code from the processed image keys. This creates less duplication in the file cache, but it means that you should do a `hugo --gc` to clean up stale files.

Fixes #5058
2018-08-13 19:00:51 +02:00

629 lines
16 KiB
Go

// Copyright 2017-present The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package resource
import (
"errors"
"fmt"
"image/color"
"io"
"os"
"strconv"
"strings"
"github.com/mitchellh/mapstructure"
"github.com/gohugoio/hugo/helpers"
// Importing image codecs for image.DecodeConfig
"image"
"image/draw"
_ "image/gif"
"image/jpeg"
_ "image/png"
"github.com/disintegration/imaging"
// Import webp codec
"sync"
_ "golang.org/x/image/webp"
)
var (
_ Resource = (*Image)(nil)
_ Source = (*Image)(nil)
_ Cloner = (*Image)(nil)
)
// Imaging contains default image processing configuration. This will be fetched
// from site (or language) config.
type Imaging struct {
// Default image quality setting (1-100). Only used for JPEG images.
Quality int
// Resample filter used. See https://github.com/disintegration/imaging
ResampleFilter string
// The anchor used in Fill. Default is "smart", i.e. Smart Crop.
Anchor string
}
const (
defaultJPEGQuality = 75
defaultResampleFilter = "box"
)
var (
imageFormats = map[string]imaging.Format{
".jpg": imaging.JPEG,
".jpeg": imaging.JPEG,
".png": imaging.PNG,
".tif": imaging.TIFF,
".tiff": imaging.TIFF,
".bmp": imaging.BMP,
".gif": imaging.GIF,
}
// Add or increment if changes to an image format's processing requires
// re-generation.
imageFormatsVersions = map[imaging.Format]int{
imaging.PNG: 2, // Floyd Steinberg dithering
}
// Increment to mark all processed images as stale. Only use when absolutely needed.
// See the finer grained smartCropVersionNumber and imageFormatsVersions.
mainImageVersionNumber = 0
)
var anchorPositions = map[string]imaging.Anchor{
strings.ToLower("Center"): imaging.Center,
strings.ToLower("TopLeft"): imaging.TopLeft,
strings.ToLower("Top"): imaging.Top,
strings.ToLower("TopRight"): imaging.TopRight,
strings.ToLower("Left"): imaging.Left,
strings.ToLower("Right"): imaging.Right,
strings.ToLower("BottomLeft"): imaging.BottomLeft,
strings.ToLower("Bottom"): imaging.Bottom,
strings.ToLower("BottomRight"): imaging.BottomRight,
}
var imageFilters = map[string]imaging.ResampleFilter{
strings.ToLower("NearestNeighbor"): imaging.NearestNeighbor,
strings.ToLower("Box"): imaging.Box,
strings.ToLower("Linear"): imaging.Linear,
strings.ToLower("Hermite"): imaging.Hermite,
strings.ToLower("MitchellNetravali"): imaging.MitchellNetravali,
strings.ToLower("CatmullRom"): imaging.CatmullRom,
strings.ToLower("BSpline"): imaging.BSpline,
strings.ToLower("Gaussian"): imaging.Gaussian,
strings.ToLower("Lanczos"): imaging.Lanczos,
strings.ToLower("Hann"): imaging.Hann,
strings.ToLower("Hamming"): imaging.Hamming,
strings.ToLower("Blackman"): imaging.Blackman,
strings.ToLower("Bartlett"): imaging.Bartlett,
strings.ToLower("Welch"): imaging.Welch,
strings.ToLower("Cosine"): imaging.Cosine,
}
type Image struct {
config image.Config
configInit sync.Once
configLoaded bool
copyToDestinationInit sync.Once
// Lock used when creating alternate versions of this image.
createMu sync.Mutex
imaging *Imaging
format imaging.Format
*genericResource
}
func (i *Image) Width() int {
i.initConfig()
return i.config.Width
}
func (i *Image) Height() int {
i.initConfig()
return i.config.Height
}
// Implement the Cloner interface.
func (i *Image) WithNewBase(base string) Resource {
return &Image{
imaging: i.imaging,
format: i.format,
genericResource: i.genericResource.WithNewBase(base).(*genericResource)}
}
// Resize resizes the image to the specified width and height using the specified resampling
// filter and returns the transformed image. If one of width or height is 0, the image aspect
// ratio is preserved.
func (i *Image) Resize(spec string) (*Image, error) {
return i.doWithImageConfig("resize", spec, func(src image.Image, conf imageConfig) (image.Image, error) {
return imaging.Resize(src, conf.Width, conf.Height, conf.Filter), nil
})
}
// Fit scales down the image using the specified resample filter to fit the specified
// maximum width and height.
func (i *Image) Fit(spec string) (*Image, error) {
return i.doWithImageConfig("fit", spec, func(src image.Image, conf imageConfig) (image.Image, error) {
return imaging.Fit(src, conf.Width, conf.Height, conf.Filter), nil
})
}
// Fill scales the image to the smallest possible size that will cover the specified dimensions,
// crops the resized image to the specified dimensions using the given anchor point.
// Space delimited config: 200x300 TopLeft
func (i *Image) Fill(spec string) (*Image, error) {
return i.doWithImageConfig("fill", spec, func(src image.Image, conf imageConfig) (image.Image, error) {
if conf.AnchorStr == smartCropIdentifier {
return smartCrop(src, conf.Width, conf.Height, conf.Anchor, conf.Filter)
}
return imaging.Fill(src, conf.Width, conf.Height, conf.Anchor, conf.Filter), nil
})
}
// Holds configuration to create a new image from an existing one, resize etc.
type imageConfig struct {
Action string
// Quality ranges from 1 to 100 inclusive, higher is better.
// This is only relevant for JPEG images.
// Default is 75.
Quality int
// Rotate rotates an image by the given angle counter-clockwise.
// The rotation will be performed first.
Rotate int
Width int
Height int
Filter imaging.ResampleFilter
FilterStr string
Anchor imaging.Anchor
AnchorStr string
}
func (i *Image) isJPEG() bool {
name := strings.ToLower(i.relTargetDirFile.file)
return strings.HasSuffix(name, ".jpg") || strings.HasSuffix(name, ".jpeg")
}
func (i *Image) doWithImageConfig(action, spec string, f func(src image.Image, conf imageConfig) (image.Image, error)) (*Image, error) {
conf, err := parseImageConfig(spec)
if err != nil {
return nil, err
}
conf.Action = action
if conf.Quality <= 0 && i.isJPEG() {
// We need a quality setting for all JPEGs
conf.Quality = i.imaging.Quality
}
if conf.FilterStr == "" {
conf.FilterStr = i.imaging.ResampleFilter
conf.Filter = imageFilters[conf.FilterStr]
}
if conf.AnchorStr == "" {
conf.AnchorStr = i.imaging.Anchor
if !strings.EqualFold(conf.AnchorStr, smartCropIdentifier) {
conf.Anchor = anchorPositions[conf.AnchorStr]
}
}
return i.spec.imageCache.getOrCreate(i, conf, func(resourceCacheFilename string) (*Image, error) {
ci := i.clone()
errOp := action
errPath := i.sourceFilename
ci.setBasePath(conf)
src, err := i.decodeSource()
if err != nil {
return nil, &os.PathError{Op: errOp, Path: errPath, Err: err}
}
if conf.Rotate != 0 {
// Rotate it before any scaling to get the dimensions correct.
src = imaging.Rotate(src, float64(conf.Rotate), color.Transparent)
}
converted, err := f(src, conf)
if err != nil {
return ci, &os.PathError{Op: errOp, Path: errPath, Err: err}
}
if i.format == imaging.PNG {
// Apply the colour palette from the source
if paletted, ok := src.(*image.Paletted); ok {
tmp := image.NewPaletted(converted.Bounds(), paletted.Palette)
draw.FloydSteinberg.Draw(tmp, tmp.Bounds(), converted, converted.Bounds().Min)
converted = tmp
}
}
b := converted.Bounds()
ci.config = image.Config{Width: b.Max.X, Height: b.Max.Y}
ci.configLoaded = true
return ci, i.encodeToDestinations(converted, conf, resourceCacheFilename, ci.targetFilenames()...)
})
}
func (i imageConfig) key(format imaging.Format) string {
k := strconv.Itoa(i.Width) + "x" + strconv.Itoa(i.Height)
if i.Action != "" {
k += "_" + i.Action
}
if i.Quality > 0 {
k += "_q" + strconv.Itoa(i.Quality)
}
if i.Rotate != 0 {
k += "_r" + strconv.Itoa(i.Rotate)
}
anchor := i.AnchorStr
if anchor == smartCropIdentifier {
anchor = anchor + strconv.Itoa(smartCropVersionNumber)
}
k += "_" + i.FilterStr
if strings.EqualFold(i.Action, "fill") {
k += "_" + anchor
}
if v, ok := imageFormatsVersions[format]; ok {
k += "_" + strconv.Itoa(v)
}
if mainImageVersionNumber > 0 {
k += "_" + strconv.Itoa(mainImageVersionNumber)
}
return k
}
func newImageConfig(width, height, quality, rotate int, filter, anchor string) imageConfig {
var c imageConfig
c.Width = width
c.Height = height
c.Quality = quality
c.Rotate = rotate
if filter != "" {
filter = strings.ToLower(filter)
if v, ok := imageFilters[filter]; ok {
c.Filter = v
c.FilterStr = filter
}
}
if anchor != "" {
anchor = strings.ToLower(anchor)
if v, ok := anchorPositions[anchor]; ok {
c.Anchor = v
c.AnchorStr = anchor
}
}
return c
}
func parseImageConfig(config string) (imageConfig, error) {
var (
c imageConfig
err error
)
if config == "" {
return c, errors.New("image config cannot be empty")
}
parts := strings.Fields(config)
for _, part := range parts {
part = strings.ToLower(part)
if part == smartCropIdentifier {
c.AnchorStr = smartCropIdentifier
} else if pos, ok := anchorPositions[part]; ok {
c.Anchor = pos
c.AnchorStr = part
} else if filter, ok := imageFilters[part]; ok {
c.Filter = filter
c.FilterStr = part
} else if part[0] == 'q' {
c.Quality, err = strconv.Atoi(part[1:])
if err != nil {
return c, err
}
if c.Quality < 1 && c.Quality > 100 {
return c, errors.New("quality ranges from 1 to 100 inclusive")
}
} else if part[0] == 'r' {
c.Rotate, err = strconv.Atoi(part[1:])
if err != nil {
return c, err
}
} else if strings.Contains(part, "x") {
widthHeight := strings.Split(part, "x")
if len(widthHeight) <= 2 {
first := widthHeight[0]
if first != "" {
c.Width, err = strconv.Atoi(first)
if err != nil {
return c, err
}
}
if len(widthHeight) == 2 {
second := widthHeight[1]
if second != "" {
c.Height, err = strconv.Atoi(second)
if err != nil {
return c, err
}
}
}
} else {
return c, errors.New("invalid image dimensions")
}
}
}
if c.Width == 0 && c.Height == 0 {
return c, errors.New("must provide Width or Height")
}
return c, nil
}
func (i *Image) initConfig() error {
var err error
i.configInit.Do(func() {
if i.configLoaded {
return
}
var (
f ReadSeekCloser
config image.Config
)
f, err = i.ReadSeekCloser()
if err != nil {
return
}
defer f.Close()
config, _, err = image.DecodeConfig(f)
if err != nil {
return
}
i.config = config
})
if err != nil {
return fmt.Errorf("failed to load image config: %s", err)
}
return nil
}
func (i *Image) decodeSource() (image.Image, error) {
f, err := i.ReadSeekCloser()
if err != nil {
return nil, fmt.Errorf("failed to open image for decode: %s", err)
}
defer f.Close()
img, _, err := image.Decode(f)
return img, err
}
func (i *Image) copyToDestination(src string) error {
var res error
i.copyToDestinationInit.Do(func() {
targetFilenames := i.targetFilenames()
var changedFilenames []string
// Fast path:
// This is a processed version of the original.
// If it exists on destination with the same filename and file size, it is
// the same file, so no need to transfer it again.
for _, targetFilename := range targetFilenames {
if fi, err := i.spec.BaseFs.PublishFs.Stat(targetFilename); err == nil && fi.Size() == i.osFileInfo.Size() {
continue
}
changedFilenames = append(changedFilenames, targetFilename)
}
if len(changedFilenames) == 0 {
return
}
in, err := i.sourceFs().Open(src)
if err != nil {
res = err
return
}
defer in.Close()
out, err := helpers.OpenFilesForWriting(i.spec.BaseFs.PublishFs, changedFilenames...)
if err != nil {
res = err
return
}
defer out.Close()
_, err = io.Copy(out, in)
if err != nil {
res = err
return
}
})
if res != nil {
return fmt.Errorf("failed to copy image to destination: %s", res)
}
return nil
}
func (i *Image) encodeToDestinations(img image.Image, conf imageConfig, resourceCacheFilename string, targetFilenames ...string) error {
file1, err := helpers.OpenFilesForWriting(i.spec.BaseFs.PublishFs, targetFilenames...)
if err != nil {
return err
}
defer file1.Close()
var w io.Writer
if resourceCacheFilename != "" {
// Also save it to the image resource cache for later reuse.
file2, err := helpers.OpenFileForWriting(i.spec.BaseFs.Resources.Fs, resourceCacheFilename)
if err != nil {
return err
}
w = io.MultiWriter(file1, file2)
defer file2.Close()
} else {
w = file1
}
switch i.format {
case imaging.JPEG:
var rgba *image.RGBA
quality := conf.Quality
if nrgba, ok := img.(*image.NRGBA); ok {
if nrgba.Opaque() {
rgba = &image.RGBA{
Pix: nrgba.Pix,
Stride: nrgba.Stride,
Rect: nrgba.Rect,
}
}
}
if rgba != nil {
return jpeg.Encode(w, rgba, &jpeg.Options{Quality: quality})
} else {
return jpeg.Encode(w, img, &jpeg.Options{Quality: quality})
}
default:
return imaging.Encode(w, img, i.format)
}
}
func (i *Image) clone() *Image {
g := *i.genericResource
g.resourceContent = &resourceContent{}
return &Image{
imaging: i.imaging,
format: i.format,
genericResource: &g}
}
func (i *Image) setBasePath(conf imageConfig) {
i.relTargetDirFile = i.relTargetPathFromConfig(conf)
}
func (i *Image) relTargetPathFromConfig(conf imageConfig) dirFile {
p1, p2 := helpers.FileAndExt(i.relTargetDirFile.file)
idStr := fmt.Sprintf("_hu%s_%d", i.hash, i.osFileInfo.Size())
// Do not change for no good reason.
const md5Threshold = 100
key := conf.key(i.format)
// It is useful to have the key in clear text, but when nesting transforms, it
// can easily be too long to read, and maybe even too long
// for the different OSes to handle.
if len(p1)+len(idStr)+len(p2) > md5Threshold {
key = helpers.MD5String(p1 + key + p2)
huIdx := strings.Index(p1, "_hu")
if huIdx != -1 {
p1 = p1[:huIdx]
} else {
// This started out as a very long file name. Making it even longer
// could melt ice in the Arctic.
p1 = ""
}
} else if strings.Contains(p1, idStr) {
// On scaling an already scaled image, we get the file info from the original.
// Repeating the same info in the filename makes it stuttery for no good reason.
idStr = ""
}
return dirFile{
dir: i.relTargetDirFile.dir,
file: fmt.Sprintf("%s%s_%s%s", p1, idStr, key, p2),
}
}
func decodeImaging(m map[string]interface{}) (Imaging, error) {
var i Imaging
if err := mapstructure.WeakDecode(m, &i); err != nil {
return i, err
}
if i.Quality == 0 {
i.Quality = defaultJPEGQuality
} else if i.Quality < 0 || i.Quality > 100 {
return i, errors.New("JPEG quality must be a number between 1 and 100")
}
if i.Anchor == "" || strings.EqualFold(i.Anchor, smartCropIdentifier) {
i.Anchor = smartCropIdentifier
} else {
i.Anchor = strings.ToLower(i.Anchor)
if _, found := anchorPositions[i.Anchor]; !found {
return i, errors.New("invalid anchor value in imaging config")
}
}
if i.ResampleFilter == "" {
i.ResampleFilter = defaultResampleFilter
} else {
filter := strings.ToLower(i.ResampleFilter)
_, found := imageFilters[filter]
if !found {
return i, fmt.Errorf("%q is not a valid resample filter", filter)
}
i.ResampleFilter = filter
}
return i, nil
}