/
pdf.go
63 lines (51 loc) · 1.3 KB
/
pdf.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
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
// Copyright © 2016 Abcum Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this info 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 image
import (
"bytes"
"errors"
"image"
"io"
"os/exec"
"github.com/disintegration/imaging"
)
func init() {
image.RegisterFormat("pdf", `%PDF`, pdfDecode, pdfConfig)
}
func pdfConfig(r io.Reader) (image.Config, error) {
return image.Config{}, errors.New("Not implemented")
}
func pdfDecode(r io.Reader) (image.Image, error) {
var buf bytes.Buffer
cmd := exec.Command(
"gs",
"-q",
"-r300",
"-dSAFER",
"-dNOPAUSE",
"-dLastPage=1",
"-dFirstPage=1",
"-sDEVICE=png16m",
"-dTextAlphaBits=4",
"-dGraphicsAlphaBits=4",
`-sstdout=%stderr`,
`-sOutputFile=%stdout`,
"-",
)
cmd.Stdin, cmd.Stdout = r, &buf
if err := cmd.Run(); err != nil {
return nil, err
}
return imaging.Decode(&buf)
}