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Fix animation timing

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The timing of the final animation frame wasn't being recorded correctly.
This commit is contained in:
Rohan Singh 2020-02-24 15:48:51 -05:00
parent 1c4bc9fe39
commit 7430f2cbfa
1 changed files with 8 additions and 7 deletions
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15
webp/anim_encode.go
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@ -21,15 +21,15 @@ import "C"
import (
"errors"
"fmt"
"time"
"image"
"time"
"unsafe"
)
// AnimationEncoder encodes multiple images into an animated WebP.
type AnimationEncoder struct {
opts C.WebPAnimEncoderOptions
c *C.WebPAnimEncoder
opts C.WebPAnimEncoderOptions
c *C.WebPAnimEncoder
duration time.Duration
}
@ -82,7 +82,9 @@ func (ae *AnimationEncoder) AddFrame(img image.Image, duration time.Duration) er
return errors.New("unsupported image type")
}
timestamp := C.int((duration + ae.duration) / time.Millisecond)
timestamp := C.int(ae.duration / time.Millisecond)
ae.duration += duration
if C.WebPAnimEncoderAdd(ae.c, pic, timestamp, nil) == 0 {
return fmt.Errorf(
"Encoding error: %d - %s",
@ -91,14 +93,13 @@ func (ae *AnimationEncoder) AddFrame(img image.Image, duration time.Duration) er
)
}
ae.duration += duration
return nil
}
// Assemble assembles all frames into animated WebP.
func (ae *AnimationEncoder) Assemble() ([]byte, error) {
// add final empty frame
if C.WebPAnimEncoderAdd(ae.c, nil, C.int(ae.duration / time.Millisecond), nil) == 0 {
if C.WebPAnimEncoderAdd(ae.c, nil, C.int(ae.duration/time.Millisecond), nil) == 0 {
return nil, errors.New("Couldn't add final empty frame")
}
@ -118,4 +119,4 @@ func (ae *AnimationEncoder) Assemble() ([]byte, error) {
// Close deletes the encoder and frees resources.
func (ae *AnimationEncoder) Close() {
C.WebPAnimEncoderDelete(ae.c)
}
}