blob: 78541533729fdd15cc6d801f811e9550930e315d (
plain) (
blame)
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
|
package libtgsconverter
import "bytes"
import "image"
import "github.com/kettek/apng"
import "github.com/av-elier/go-decimal-to-rational"
type toapng struct {
apng apng.APNG
prev_frame *image.RGBA
}
func(to_apng *toapng) init(w uint, h uint, options ConverterOptions) {
}
func(to_apng *toapng) SupportsAnimation() bool {
return true
}
func (to_apng *toapng) AddFrame(image *image.RGBA, fps uint) error {
if to_apng.prev_frame != nil && sameImage(to_apng.prev_frame, image) {
var idx = len(to_apng.apng.Frames) - 1
var prev_fps = float64(to_apng.apng.Frames[idx].DelayNumerator) / float64(to_apng.apng.Frames[idx].DelayDenominator)
prev_fps += 1.0 / float64(fps)
rat := dectofrac.NewRatP(prev_fps, 0.001)
to_apng.apng.Frames[idx].DelayNumerator = uint16(rat.Num().Int64())
to_apng.apng.Frames[idx].DelayDenominator = uint16(rat.Denom().Int64())
return nil
}
f := apng.Frame{}
f.Image = image
f.DelayNumerator = 1
f.DelayDenominator = uint16(fps)
f.DisposeOp = apng.DISPOSE_OP_BACKGROUND
f.BlendOp = apng.BLEND_OP_SOURCE
f.IsDefault = false
to_apng.apng.Frames = append(to_apng.apng.Frames, f)
to_apng.prev_frame = image
return nil
}
func (to_apng *toapng) Result() []byte {
var data []byte
w := bytes.NewBuffer(data)
err := apng.Encode(w, to_apng.apng)
if err != nil {
return nil
}
return w.Bytes()
}
|
