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53cafa9f3d
This commit adds support for go/cgo tgs conversion when building with the -tags `cgo` The default binaries are still "pure" go and uses the old way of converting. * Move lottie_convert.py conversion code to its own file * Add optional libtgsconverter * Update vendor * Apply suggestions from code review * Update bridge/helper/libtgsconverter.go Co-authored-by: Wim <wim@42.be>
82 lines
2.0 KiB
Go
82 lines
2.0 KiB
Go
package libtgsconverter
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import "bytes"
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import "image"
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import "image/color"
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import "image/gif"
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type togif struct {
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gif gif.GIF
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images []image.Image
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prev_frame *image.RGBA
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}
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func(to_gif *togif) init(w uint, h uint, options ConverterOptions) {
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to_gif.gif.Config.Width = int(w)
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to_gif.gif.Config.Height = int(h)
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}
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func(to_gif *togif) SupportsAnimation() bool {
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return true
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}
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func (to_gif *togif) AddFrame(image *image.RGBA, fps uint) error {
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var fps_int = int(1.0 / float32(fps) * 100.)
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if to_gif.prev_frame != nil && sameImage(to_gif.prev_frame, image) {
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to_gif.gif.Delay[len(to_gif.gif.Delay) - 1] += fps_int
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return nil
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}
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to_gif.gif.Image = append(to_gif.gif.Image, nil)
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to_gif.gif.Delay = append(to_gif.gif.Delay, fps_int)
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to_gif.gif.Disposal = append(to_gif.gif.Disposal, gif.DisposalBackground)
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to_gif.images = append(to_gif.images, image)
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to_gif.prev_frame = image
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return nil
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}
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func (to_gif *togif) Result() []byte {
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q := medianCutQuantizer{mode, nil, false}
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p := q.quantizeMultiple(make([]color.Color, 0, 256), to_gif.images)
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// Add transparent entry finally
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var trans_idx uint8 = 0
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if q.reserveTransparent {
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trans_idx = uint8(len(p))
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}
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var id_map = make(map[uint32]uint8)
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for i, img := range to_gif.images {
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pi := image.NewPaletted(img.Bounds(), p)
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for y := 0; y < img.Bounds().Dy(); y++ {
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for x := 0; x < img.Bounds().Dx(); x++ {
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c := img.At(x, y)
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cr, cg, cb, ca := c.RGBA()
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cid := (cr >> 8) << 16 | cg | (cb >> 8)
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if q.reserveTransparent && ca == 0 {
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pi.Pix[pi.PixOffset(x, y)] = trans_idx
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} else if val, ok := id_map[cid]; ok {
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pi.Pix[pi.PixOffset(x, y)] = val
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} else {
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val := uint8(p.Index(c))
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pi.Pix[pi.PixOffset(x, y)] = val
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id_map[cid] = val
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}
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}
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}
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to_gif.gif.Image[i] = pi
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}
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if q.reserveTransparent {
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p = append(p, color.RGBA{0, 0, 0, 0})
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}
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for _, img := range to_gif.gif.Image {
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img.Palette = p
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}
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to_gif.gif.Config.ColorModel = p
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var data []byte
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w := bytes.NewBuffer(data)
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err := gif.EncodeAll(w, &to_gif.gif)
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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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