/
diff.go
37 lines (33 loc) · 1.26 KB
/
diff.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
// Copyright 2015 Google Inc. 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 imgdiff provides image comparison using simple
// and perceptual diff algorithms.
package imgdiff
import (
"errors"
"image"
)
// ErrSize is used when the two images under comparison have different sizes.
var ErrSize = errors.New("images have different sizes")
// Differ is the image comparison interface.
// All supported algorithms implement it.
type Differ interface {
// Compare compares images a and b, returning the resulting
// difference image and the number of pixels that are different
// according to an algorithm.
//
// It returns ErrSize if images have their width or height
// do not match.
Compare(a, b image.Image) (image.Image, int, error)
}