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// Copyright 2018 kts of kettek / Ketchetwahmeegwun Tecumseh Southall. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package apng
import (
"image"
)
// dispose_op values, as per the APNG spec.
const (
DISPOSE_OP_NONE = 0
DISPOSE_OP_BACKGROUND = 1
DISPOSE_OP_PREVIOUS = 2
)
// blend_op values, as per the APNG spec.
const (
BLEND_OP_SOURCE = 0
BLEND_OP_OVER = 1
)
type Frame struct {
Image image.Image
width, height int
XOffset, YOffset int
DelayNumerator uint16
DelayDenominator uint16
DisposeOp byte
BlendOp byte
// IsDefault indicates if the Frame is a default image that
// should not be used in the animation. IsDefault can only
// be true on the first frame.
IsDefault bool
}
// GetDelay returns the number of seconds in the frame.
func (f *Frame) GetDelay() float64 {
d := uint16(0)
if f.DelayDenominator == 0 {
d = 100
} else {
d = f.DelayDenominator
}
return float64(f.DelayNumerator) / float64(d)
}
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