resources/images: Allow to set background fill colour

Closes #6298
This commit is contained in:
Bjørn Erik Pedersen 2019-10-20 10:39:00 +02:00
parent 689f647baf
commit 4b286b9d27
15 changed files with 356 additions and 45 deletions

View file

@ -2,7 +2,6 @@
title: "Image Processing"
description: "Image Page resources can be resized and cropped."
date: 2018-01-24T13:10:00-05:00
lastmod: 2018-01-26T15:59:07-05:00
linktitle: "Image Processing"
categories: ["content management"]
keywords: [bundle,content,resources,images]
@ -72,31 +71,42 @@ Image operations in Hugo currently **do not preserve EXIF data** as this is not
In addition to the dimensions (e.g. `600x400`), Hugo supports a set of additional image options.
### Background Color
JPEG Quality
: Only relevant for JPEG images, values 1 to 100 inclusive, higher is better. Default is 75.
The background color to fill into the transparency layer. This is mostly useful when converting to a format that does not support transparency, e.g. `JPEG`.
You can set the background color to use with a 3 or 6 digit hex code starting with `#`.
```go
{{ $image.Resize "600x jpg #b31280" }}
```
For color codes, see https://www.google.com/search?q=color+picker
### JPEG Quality
Only relevant for JPEG images, values 1 to 100 inclusive, higher is better. Default is 75.
```go
{{ $image.Resize "600x q50" }}
```
Rotate
: Rotates an image by the given angle counter-clockwise. The rotation will be performed first to get the dimensions correct. The main use of this is to be able to manually correct for [EXIF orientation](https://github.com/golang/go/issues/4341) of JPEG images.
### Rotate
Rotates an image by the given angle counter-clockwise. The rotation will be performed first to get the dimensions correct. The main use of this is to be able to manually correct for [EXIF orientation](https://github.com/golang/go/issues/4341) of JPEG images.
```go
{{ $image.Resize "600x r90" }}
```
Anchor
: Only relevant for the `Fill` method. This is useful for thumbnail generation where the main motive is located in, say, the left corner.
### Anchor
Only relevant for the `Fill` method. This is useful for thumbnail generation where the main motive is located in, say, the left corner.
Valid are `Center`, `TopLeft`, `Top`, `TopRight`, `Left`, `Right`, `BottomLeft`, `Bottom`, `BottomRight`.
```go
{{ $image.Fill "300x200 BottomLeft" }}
```
Resample Filter
: Filter used in resizing. Default is `Box`, a simple and fast resampling filter appropriate for downscaling.
### Resample Filter
Filter used in resizing. Default is `Box`, a simple and fast resampling filter appropriate for downscaling.
Examples are: `Box`, `NearestNeighbor`, `Linear`, `Gaussian`.
@ -106,6 +116,16 @@ See https://github.com/disintegration/imaging for more. If you want to trade qua
{{ $image.Resize "600x400 Gaussian" }}
```
### Target Format
By default the images is encoded in the source format, but you can set the target format as an option.
Valid values are `jpg`, `png`, `tif`, `bmp`, and `gif`.
```go
{{ $image.Resize "600x jpg" }}
```
## Image Processing Examples
_The photo of the sunset used in the examples below is Copyright [Bjørn Erik Pedersen](https://commons.wikimedia.org/wiki/User:Bep) (Creative Commons Attribution-Share Alike 4.0 International license)_
@ -160,6 +180,13 @@ quality = 75
# Valid values are Smart, Center, TopLeft, Top, TopRight, Left, Right, BottomLeft, Bottom, BottomRight
anchor = "smart"
# Default background color.
# Hugo will preserve transparency for target formats that supports it,
# but will fall back to this color for JPEG.
# Expects a standard HEX color string with 3 or 6 digits.
# See https://www.google.com/search?q=color+picker
bgColor = "#ffffff"
```
All of the above settings can also be set per image procecssing.

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@ -205,10 +205,11 @@ SUNSET2: {{ $resized2.RelPermalink }}/{{ $resized2.Width }}/Lat: {{ $resized2.Ex
// Check the file cache
b.AssertImage(200, 200, "resources/_gen/images/bundle/sunset_hu59e56ffff1bc1d8d122b1403d34e039f_90587_200x200_resize_q75_box.jpg")
b.AssertFileContent("resources/_gen/images/bundle/sunset_17701188623491591036.json",
b.AssertFileContent("resources/_gen/images/bundle/sunset_7645215769587362592.json",
"DateTimeDigitized|time.Time", "PENTAX")
b.AssertImage(123, 234, "resources/_gen/images/sunset_hu59e56ffff1bc1d8d122b1403d34e039f_90587_123x234_resize_q75_box.jpg")
b.AssertFileContent("resources/_gen/images/sunset_17701188623491591036.json",
b.AssertFileContent("resources/_gen/images/sunset_7645215769587362592.json",
"DateTimeDigitized|time.Time", "PENTAX")
// TODO(bep) add this as a default assertion after Build()?

View file

@ -17,6 +17,7 @@ import (
"encoding/json"
"fmt"
"image"
"image/color"
"image/draw"
_ "image/gif"
_ "image/png"
@ -254,10 +255,32 @@ func (i *imageResource) doWithImageConfig(conf images.ImageConfig, f func(src im
return nil, nil, &os.PathError{Op: errOp, Path: errPath, Err: err}
}
hasAlpha := !images.IsOpaque(converted)
shouldFill := conf.BgColor != nil && hasAlpha
shouldFill = shouldFill || (!conf.TargetFormat.SupportsTransparency() && hasAlpha)
var bgColor color.Color
if shouldFill {
bgColor = conf.BgColor
if bgColor == nil {
bgColor = i.Proc.Cfg.BgColor
}
tmp := image.NewRGBA(converted.Bounds())
draw.Draw(tmp, tmp.Bounds(), image.NewUniform(bgColor), image.Point{}, draw.Src)
draw.Draw(tmp, tmp.Bounds(), converted, converted.Bounds().Min, draw.Over)
converted = tmp
}
if conf.TargetFormat == images.PNG {
// Apply the colour palette from the source
if paletted, ok := src.(*image.Paletted); ok {
tmp := image.NewPaletted(converted.Bounds(), paletted.Palette)
palette := paletted.Palette
if bgColor != nil && len(palette) < 256 {
palette = images.AddColorToPalette(bgColor, palette)
} else if bgColor != nil {
images.ReplaceColorInPalette(bgColor, palette)
}
tmp := image.NewPaletted(converted.Bounds(), palette)
draw.FloydSteinberg.Draw(tmp, tmp.Bounds(), converted, converted.Bounds().Min)
converted = tmp
}
@ -273,7 +296,7 @@ func (i *imageResource) doWithImageConfig(conf images.ImageConfig, f func(src im
}
func (i *imageResource) decodeImageConfig(action, spec string) (images.ImageConfig, error) {
conf, err := images.DecodeImageConfig(action, spec, i.Proc.Cfg)
conf, err := images.DecodeImageConfig(action, spec, i.Proc.Cfg.Cfg)
if err != nil {
return conf, err
}
@ -285,7 +308,14 @@ func (i *imageResource) decodeImageConfig(action, spec string) (images.ImageConf
if conf.Quality <= 0 && conf.TargetFormat.RequiresDefaultQuality() {
// We need a quality setting for all JPEGs
conf.Quality = i.Proc.Cfg.Quality
conf.Quality = i.Proc.Cfg.Cfg.Quality
}
if conf.BgColor == nil && conf.TargetFormat != i.Format {
if i.Format.SupportsTransparency() && !conf.TargetFormat.SupportsTransparency() {
conf.BgColor = i.Proc.Cfg.BgColor
conf.BgColorStr = i.Proc.Cfg.Cfg.BgColor
}
}
return conf, nil
@ -325,7 +355,7 @@ func (i *imageResource) setBasePath(conf images.ImageConfig) {
func (i *imageResource) getImageMetaCacheTargetPath() string {
const imageMetaVersionNumber = 1 // Increment to invalidate the meta cache
cfg := i.getSpec().imaging.Cfg
cfg := i.getSpec().imaging.Cfg.Cfg
df := i.getResourcePaths().relTargetDirFile
if fi := i.getFileInfo(); fi != nil {
df.dir = filepath.Dir(fi.Meta().Path())

View file

@ -22,7 +22,6 @@ import (
"os"
"path"
"path/filepath"
"regexp"
"runtime"
"strconv"
"sync"
@ -540,6 +539,18 @@ func TestImageOperationsGolden(t *testing.T) {
fmt.Println(workDir)
}
// Test PNGs with alpha channel.
for _, img := range []string{"gopher-hero8.png", "gradient-circle.png"} {
orig := fetchImageForSpec(spec, c, img)
for _, resizeSpec := range []string{"200x #e3e615", "200x jpg #e3e615"} {
resized, err := orig.Resize(resizeSpec)
c.Assert(err, qt.IsNil)
rel := resized.RelPermalink()
c.Log("resize", rel)
c.Assert(rel, qt.Not(qt.Equals), "")
}
}
for _, img := range testImages {
orig := fetchImageForSpec(spec, c, img)
@ -618,9 +629,6 @@ func TestImageOperationsGolden(t *testing.T) {
c.Assert(len(dirinfos1), qt.Equals, len(dirinfos2))
for i, fi1 := range dirinfos1 {
if regexp.MustCompile("gauss").MatchString(fi1.Name()) {
continue
}
fi2 := dirinfos2[i]
c.Assert(fi1.Name(), qt.Equals, fi2.Name())

85
resources/images/color.go Normal file
View file

@ -0,0 +1,85 @@
// Copyright 2019 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 images
import (
"encoding/hex"
"image/color"
"strings"
"github.com/pkg/errors"
)
// AddColorToPalette adds c as the first color in p if not already there.
// Note that it does no additional checks, so callers must make sure
// that the palette is valid for the relevant format.
func AddColorToPalette(c color.Color, p color.Palette) color.Palette {
var found bool
for _, cc := range p {
if c == cc {
found = true
break
}
}
if !found {
p = append(color.Palette{c}, p...)
}
return p
}
// ReplaceColorInPalette will replace the color in palette p closest to c in Euclidean
// R,G,B,A space with c.
func ReplaceColorInPalette(c color.Color, p color.Palette) {
p[p.Index(c)] = c
}
func hexStringToColor(s string) (color.Color, error) {
s = strings.TrimPrefix(s, "#")
if len(s) != 3 && len(s) != 6 {
return nil, errors.Errorf("invalid color code: %q", s)
}
s = strings.ToLower(s)
if len(s) == 3 {
var v string
for _, r := range s {
v += string(r) + string(r)
}
s = v
}
// Standard colors.
if s == "ffffff" {
return color.White, nil
}
if s == "000000" {
return color.Black, nil
}
// Set Alfa to white.
s += "ff"
b, err := hex.DecodeString(s)
if err != nil {
return nil, err
}
return color.RGBA{b[0], b[1], b[2], b[3]}, nil
}

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@ -0,0 +1,90 @@
// Copyright 2019 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 images
import (
"image/color"
"testing"
qt "github.com/frankban/quicktest"
)
func TestHexStringToColor(t *testing.T) {
c := qt.New(t)
for _, test := range []struct {
arg string
expect interface{}
}{
{"f", false},
{"#f", false},
{"#fffffff", false},
{"fffffff", false},
{"#fff", color.White},
{"fff", color.White},
{"FFF", color.White},
{"FfF", color.White},
{"#ffffff", color.White},
{"ffffff", color.White},
{"#000", color.Black},
{"#4287f5", color.RGBA{R: 0x42, G: 0x87, B: 0xf5, A: 0xff}},
{"777", color.RGBA{R: 0x77, G: 0x77, B: 0x77, A: 0xff}},
} {
test := test
c.Run(test.arg, func(c *qt.C) {
c.Parallel()
result, err := hexStringToColor(test.arg)
if b, ok := test.expect.(bool); ok && !b {
c.Assert(err, qt.Not(qt.IsNil))
return
}
c.Assert(err, qt.IsNil)
c.Assert(result, qt.DeepEquals, test.expect)
})
}
}
func TestAddColorToPalette(t *testing.T) {
c := qt.New(t)
palette := color.Palette{color.White, color.Black}
c.Assert(AddColorToPalette(color.White, palette), qt.HasLen, 2)
blue1, _ := hexStringToColor("34c3eb")
blue2, _ := hexStringToColor("34c3eb")
white, _ := hexStringToColor("fff")
c.Assert(AddColorToPalette(white, palette), qt.HasLen, 2)
c.Assert(AddColorToPalette(blue1, palette), qt.HasLen, 3)
c.Assert(AddColorToPalette(blue2, palette), qt.HasLen, 3)
}
func TestReplaceColorInPalette(t *testing.T) {
c := qt.New(t)
palette := color.Palette{color.White, color.Black}
offWhite, _ := hexStringToColor("fcfcfc")
ReplaceColorInPalette(offWhite, palette)
c.Assert(palette, qt.HasLen, 2)
c.Assert(palette[0], qt.Equals, offWhite)
}

View file

@ -16,6 +16,7 @@ package images
import (
"errors"
"fmt"
"image/color"
"strconv"
"strings"
@ -27,6 +28,7 @@ import (
const (
defaultJPEGQuality = 75
defaultResampleFilter = "box"
defaultBgColor = "ffffff"
)
var (
@ -87,16 +89,28 @@ func ImageFormatFromExt(ext string) (Format, bool) {
return f, found
}
func DecodeConfig(m map[string]interface{}) (Imaging, error) {
func DecodeConfig(m map[string]interface{}) (ImagingConfig, error) {
var i Imaging
var ic ImagingConfig
if err := mapstructure.WeakDecode(m, &i); err != nil {
return i, err
return ic, 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")
return ic, errors.New("JPEG quality must be a number between 1 and 100")
}
if i.BgColor != "" {
i.BgColor = strings.TrimPrefix(i.BgColor, "#")
} else {
i.BgColor = defaultBgColor
}
var err error
ic.BgColor, err = hexStringToColor(i.BgColor)
if err != nil {
return ic, err
}
if i.Anchor == "" || strings.EqualFold(i.Anchor, smartCropIdentifier) {
@ -104,7 +118,7 @@ func DecodeConfig(m map[string]interface{}) (Imaging, error) {
} else {
i.Anchor = strings.ToLower(i.Anchor)
if _, found := anchorPositions[i.Anchor]; !found {
return i, errors.New("invalid anchor value in imaging config")
return ic, errors.New("invalid anchor value in imaging config")
}
}
@ -114,7 +128,7 @@ func DecodeConfig(m map[string]interface{}) (Imaging, error) {
filter := strings.ToLower(i.ResampleFilter)
_, found := imageFilters[filter]
if !found {
return i, fmt.Errorf("%q is not a valid resample filter", filter)
return ic, fmt.Errorf("%q is not a valid resample filter", filter)
}
i.ResampleFilter = filter
}
@ -124,7 +138,9 @@ func DecodeConfig(m map[string]interface{}) (Imaging, error) {
i.Exif.ExcludeFields = "GPS|Exif|Exposure[M|P|B]|Contrast|Resolution|Sharp|JPEG|Metering|Sensing|Saturation|ColorSpace|Flash|WhiteBalance"
}
return i, nil
ic.Cfg = i
return ic, nil
}
func DecodeImageConfig(action, config string, defaults Imaging) (ImageConfig, error) {
@ -151,6 +167,12 @@ func DecodeImageConfig(action, config string, defaults Imaging) (ImageConfig, er
} else if filter, ok := imageFilters[part]; ok {
c.Filter = filter
c.FilterStr = part
} else if part[0] == '#' {
c.BgColorStr = part[1:]
c.BgColor, err = hexStringToColor(c.BgColorStr)
if err != nil {
return c, err
}
} else if part[0] == 'q' {
c.Quality, err = strconv.Atoi(part[1:])
if err != nil {
@ -230,6 +252,14 @@ type ImageConfig struct {
// The rotation will be performed first.
Rotate int
// Used to fill any transparency.
// When set in site config, it's used when converting to a format that does
// not support transparency.
// When set per image operation, it's used even for formats that does support
// transparency.
BgColor color.Color
BgColorStr string
Width int
Height int
@ -255,6 +285,10 @@ func (i ImageConfig) GetKey(format Format) string {
if i.Rotate != 0 {
k += "_r" + strconv.Itoa(i.Rotate)
}
if i.BgColorStr != "" {
k += "_bg" + i.BgColorStr
}
anchor := i.AnchorStr
if anchor == smartCropIdentifier {
anchor = anchor + strconv.Itoa(smartCropVersionNumber)
@ -277,6 +311,13 @@ func (i ImageConfig) GetKey(format Format) string {
return k
}
type ImagingConfig struct {
BgColor color.Color
// Config as provided by the user.
Cfg Imaging
}
// Imaging contains default image processing configuration. This will be fetched
// from site (or language) config.
type Imaging struct {
@ -289,6 +330,9 @@ type Imaging struct {
// The anchor to use in Fill. Default is "smart", i.e. Smart Crop.
Anchor string
// Default color used in fill operations (e.g. "fff" for white).
BgColor string
Exif ExifConfig
}

View file

@ -29,17 +29,19 @@ func TestDecodeConfig(t *testing.T) {
"anchor": "topLeft",
}
imaging, err := DecodeConfig(m)
imagingConfig, err := DecodeConfig(m)
c.Assert(err, qt.IsNil)
imaging := imagingConfig.Cfg
c.Assert(imaging.Quality, qt.Equals, 42)
c.Assert(imaging.ResampleFilter, qt.Equals, "nearestneighbor")
c.Assert(imaging.Anchor, qt.Equals, "topleft")
m = map[string]interface{}{}
imaging, err = DecodeConfig(m)
imagingConfig, err = DecodeConfig(m)
c.Assert(err, qt.IsNil)
imaging = imagingConfig.Cfg
c.Assert(imaging.Quality, qt.Equals, defaultJPEGQuality)
c.Assert(imaging.ResampleFilter, qt.Equals, "box")
c.Assert(imaging.Anchor, qt.Equals, "smart")
@ -59,18 +61,20 @@ func TestDecodeConfig(t *testing.T) {
})
c.Assert(err, qt.Not(qt.IsNil))
imaging, err = DecodeConfig(map[string]interface{}{
imagingConfig, err = DecodeConfig(map[string]interface{}{
"anchor": "Smart",
})
imaging = imagingConfig.Cfg
c.Assert(err, qt.IsNil)
c.Assert(imaging.Anchor, qt.Equals, "smart")
imaging, err = DecodeConfig(map[string]interface{}{
imagingConfig, err = DecodeConfig(map[string]interface{}{
"exif": map[string]interface{}{
"disableLatLong": true,
},
})
c.Assert(err, qt.IsNil)
imaging = imagingConfig.Cfg
c.Assert(imaging.Exif.DisableLatLong, qt.Equals, true)
c.Assert(imaging.Exif.ExcludeFields, qt.Equals, "GPS|Exif|Exposure[M|P|B]|Contrast|Resolution|Sharp|JPEG|Metering|Sensing|Saturation|ColorSpace|Flash|WhiteBalance")
@ -81,11 +85,12 @@ func TestDecodeImageConfig(t *testing.T) {
in string
expect interface{}
}{
{"300x400", newImageConfig(300, 400, 0, 0, "", "")},
{"100x200 bottomRight", newImageConfig(100, 200, 0, 0, "", "BottomRight")},
{"10x20 topleft Lanczos", newImageConfig(10, 20, 0, 0, "Lanczos", "topleft")},
{"linear left 10x r180", newImageConfig(10, 0, 0, 180, "linear", "left")},
{"x20 riGht Cosine q95", newImageConfig(0, 20, 95, 0, "cosine", "right")},
{"300x400", newImageConfig(300, 400, 0, 0, "", "", "")},
{"300x400 #fff", newImageConfig(300, 400, 0, 0, "", "", "fff")},
{"100x200 bottomRight", newImageConfig(100, 200, 0, 0, "", "BottomRight", "")},
{"10x20 topleft Lanczos", newImageConfig(10, 20, 0, 0, "Lanczos", "topleft", "")},
{"linear left 10x r180", newImageConfig(10, 0, 0, 180, "linear", "left", "")},
{"x20 riGht Cosine q95", newImageConfig(0, 20, 95, 0, "cosine", "right", "")},
{"", false},
{"foo", false},
@ -107,13 +112,15 @@ func TestDecodeImageConfig(t *testing.T) {
}
}
func newImageConfig(width, height, quality, rotate int, filter, anchor string) ImageConfig {
func newImageConfig(width, height, quality, rotate int, filter, anchor, bgColor string) ImageConfig {
var c ImageConfig
c.Action = "resize"
c.Width = width
c.Height = height
c.Quality = quality
c.Rotate = rotate
c.BgColorStr = bgColor
c.BgColor, _ = hexStringToColor(bgColor)
if filter != "" {
filter = strings.ToLower(filter)

View file

@ -51,11 +51,8 @@ func NewImage(f Format, proc *ImageProcessor, img image.Image, s Spec) *Image {
type Image struct {
Format Format
Proc *ImageProcessor
Spec Spec
Proc *ImageProcessor
Spec Spec
*imageConfig
}
@ -158,8 +155,8 @@ func (i *Image) initConfig() error {
return nil
}
func NewImageProcessor(cfg Imaging) (*ImageProcessor, error) {
e := cfg.Exif
func NewImageProcessor(cfg ImagingConfig) (*ImageProcessor, error) {
e := cfg.Cfg.Exif
exifDecoder, err := exif.NewDecoder(
exif.WithDateDisabled(e.DisableDate),
exif.WithLatLongDisabled(e.DisableLatLong),
@ -179,7 +176,7 @@ func NewImageProcessor(cfg Imaging) (*ImageProcessor, error) {
}
type ImageProcessor struct {
Cfg Imaging
Cfg ImagingConfig
exifDecoder *exif.Decoder
}
@ -218,7 +215,12 @@ func (p *ImageProcessor) ApplyFiltersFromConfig(src image.Image, conf ImageConfi
return nil, errors.Errorf("unsupported action: %q", conf.Action)
}
return p.Filter(src, filters...)
img, err := p.Filter(src, filters...)
if err != nil {
return nil, err
}
return img, nil
}
func (p *ImageProcessor) Filter(src image.Image, filters ...gift.Filter) (image.Image, error) {
@ -231,7 +233,7 @@ func (p *ImageProcessor) Filter(src image.Image, filters ...gift.Filter) (image.
func (p *ImageProcessor) GetDefaultImageConfig(action string) ImageConfig {
return ImageConfig{
Action: action,
Quality: p.Cfg.Quality,
Quality: p.Cfg.Cfg.Quality,
}
}
@ -256,6 +258,11 @@ func (f Format) RequiresDefaultQuality() bool {
return f == JPEG
}
// SupportsTransparency reports whether it supports transparency in any form.
func (f Format) SupportsTransparency() bool {
return f != JPEG
}
// DefaultExtension returns the default file extension of this format, starting with a dot.
// For example: .jpg for JPEG
func (f Format) DefaultExtension() string {
@ -307,3 +314,15 @@ func ToFilters(in interface{}) []gift.Filter {
panic(fmt.Sprintf("%T is not an image filter", in))
}
}
// IsOpaque returns false if the image has alpha channel and there is at least 1
// pixel that is not (fully) opaque.
func IsOpaque(img image.Image) bool {
if oim, ok := img.(interface {
Opaque() bool
}); ok {
return oim.Opaque()
}
return false
}

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