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