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images: Add images.Overlay filter
This allows for constructs ala: ``` {{ $overlay := $img.Filter (images.Overlay $logo 50 50 )}} ``` Or: ``` {{ $logoFilter := (images.Overlay $logo 50 50 ) }} {{ $overlay := $img | images.Filter $logoFilter }} ``` Which will overlay the logo in the top left corner (x=50, y=50) of `$img`. Fixes #8057 Fixes #4595 Updates #6731
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12 changed files with 101 additions and 2 deletions
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@ -17,6 +17,30 @@ toc: true
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See [images.Filter](#filter) for how to apply these filters to an image.
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### Overlay
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{{< new-in "0.80.0" >}}
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{{% funcsig %}}
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images.Overlay SRC X Y
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{{% /funcsig %}}
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Overlay creates a filter that overlays the source image at position x y, e.g:
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```go-html-template
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{{ $logoFilter := (images.Overlay $logo 50 50 ) }}
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{{ $img := $img | images.Filter $logoFilter }}
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```
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A shorter version of the above, if you only need to apply the filter once:
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```go-html-template
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{{ $img := $img.Filter (images.Overlay $logo 50 50 )}}
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```
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The above will overlay `$logo` in the upper left corner of `$img` (at position `x=50, y=50`).
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### Brightness
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{{% funcsig %}}
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@ -242,7 +242,7 @@ func (i *imageResource) doWithImageConfig(conf images.ImageConfig, f func(src im
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errOp := conf.Action
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errPath := i.getSourceFilename()
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src, err := i.decodeSource()
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src, err := i.DecodeImage()
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if err != nil {
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return nil, nil, &os.PathError{Op: errOp, Path: errPath, Err: err}
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}
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@ -324,7 +324,9 @@ func (i *imageResource) decodeImageConfig(action, spec string) (images.ImageConf
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return conf, nil
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}
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func (i *imageResource) decodeSource() (image.Image, error) {
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// DecodeImage decodes the image source into an Image.
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// This an internal method and may change.
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func (i *imageResource) DecodeImage() (image.Image, error) {
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f, err := i.ReadSeekCloser()
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if err != nil {
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return nil, _errors.Wrap(err, "failed to open image for decode")
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@ -533,6 +533,11 @@ func TestImageOperationsGolden(t *testing.T) {
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fmt.Println(workDir)
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}
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gopher := fetchImageForSpec(spec, c, "gopher-hero8.png")
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var err error
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gopher, err = gopher.Resize("30x")
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c.Assert(err, qt.IsNil)
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// Test PNGs with alpha channel.
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for _, img := range []string{"gopher-hero8.png", "gradient-circle.png"} {
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orig := fetchImageForSpec(spec, c, img)
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@ -589,6 +594,7 @@ func TestImageOperationsGolden(t *testing.T) {
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f.Invert(),
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f.Hue(22),
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f.Contrast(32.5),
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f.Overlay(gopher.(images.ImageSource), 20, 30),
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}
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resized, err := orig.Fill("400x200 center")
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@ -25,6 +25,14 @@ const filterAPIVersion = 0
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type Filters struct {
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}
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// Overlay creates a filter that overlays src at position x y.
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func (*Filters) Overlay(src ImageSource, x, y interface{}) gift.Filter {
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return filter{
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Options: newFilterOpts(src.Key(), x, y),
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Filter: overlayFilter{src: src, x: cast.ToInt(x), y: cast.ToInt(y)},
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}
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}
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// Brightness creates a filter that changes the brightness of an image.
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// The percentage parameter must be in range (-100, 100).
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func (*Filters) Brightness(percentage interface{}) gift.Filter {
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@ -325,3 +325,9 @@ func IsOpaque(img image.Image) bool {
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return false
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}
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// ImageSource identifies and decodes an image.
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type ImageSource interface {
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DecodeImage() (image.Image, error)
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Key() string
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}
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43
resources/images/overlay.go
Normal file
43
resources/images/overlay.go
Normal file
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@ -0,0 +1,43 @@
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// Copyright 2020 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package images
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import (
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"fmt"
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"image"
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"image/draw"
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"github.com/disintegration/gift"
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)
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var _ gift.Filter = (*overlayFilter)(nil)
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type overlayFilter struct {
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src ImageSource
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x, y int
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}
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func (f overlayFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
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overlaySrc, err := f.src.DecodeImage()
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if err != nil {
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panic(fmt.Sprintf("failed to decode image: %s", err))
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}
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gift.New().Draw(dst, src)
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gift.New().DrawAt(dst, overlaySrc, image.Pt(f.x, f.y), gift.OverOperator)
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}
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func (f overlayFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
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return image.Rect(0, 0, srcBounds.Dx(), srcBounds.Dy())
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}
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@ -14,6 +14,8 @@
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package resource
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import (
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"image"
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"github.com/gohugoio/hugo/common/maps"
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"github.com/gohugoio/hugo/langs"
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"github.com/gohugoio/hugo/media"
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@ -59,6 +61,9 @@ type ImageOps interface {
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Resize(spec string) (Image, error)
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Filter(filters ...interface{}) (Image, error)
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Exif() *exif.Exif
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// Internal
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DecodeImage() (image.Image, error)
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}
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type ResourceTypeProvider interface {
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@ -16,6 +16,7 @@ package resources
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import (
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"bytes"
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"fmt"
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"image"
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"io"
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"path"
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"strings"
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@ -264,6 +265,10 @@ func (r *resourceAdapter) Width() int {
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return r.getImageOps().Width()
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}
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func (r *resourceAdapter) DecodeImage() (image.Image, error) {
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return r.getImageOps().DecodeImage()
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}
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func (r *resourceAdapter) getImageOps() resource.ImageOps {
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img, ok := r.target.(resource.ImageOps)
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if !ok {
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