-
-
Notifications
You must be signed in to change notification settings - Fork 7.4k
/
overlay.go
43 lines (35 loc) · 1.22 KB
/
overlay.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
// Copyright 2020 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 (
"fmt"
"image"
"image/draw"
"github.com/disintegration/gift"
)
var _ gift.Filter = (*overlayFilter)(nil)
type overlayFilter struct {
src ImageSource
x, y int
}
func (f overlayFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
overlaySrc, err := f.src.DecodeImage()
if err != nil {
panic(fmt.Sprintf("failed to decode image: %s", err))
}
gift.New().Draw(dst, src)
gift.New().DrawAt(dst, overlaySrc, image.Pt(f.x, f.y), gift.OverOperator)
}
func (f overlayFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
return image.Rect(0, 0, srcBounds.Dx(), srcBounds.Dy())
}