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package webpanimation
import (
"errors"
"fmt"
"image"
"image/draw"
"io"
)
type WebpAnimation struct {
WebPAnimEncoderOptions *WebPAnimEncoderOptions
Width int
Height int
loopCount int
AnimationEncoder *WebPAnimEncoder
WebPData *WebPData
WebPMux *WebPMux
WebPPictures []*WebPPicture
}
// NewWebpAnimation Initialize animation
func NewWebpAnimation(width, height, loopCount int) *WebpAnimation {
webpAnimation := &WebpAnimation{loopCount: loopCount, Width: width, Height: height}
webpAnimation.WebPAnimEncoderOptions = &WebPAnimEncoderOptions{}
WebPAnimEncoderOptionsInitInternal(webpAnimation.WebPAnimEncoderOptions)
webpAnimation.AnimationEncoder = WebPAnimEncoderNewInternal(width, height, webpAnimation.WebPAnimEncoderOptions)
return webpAnimation
}
// ReleaseMemory release memory
func (wpa *WebpAnimation) ReleaseMemory() {
WebPDataClear(wpa.WebPData)
WebPMuxDelete(wpa.WebPMux)
for _, webpPicture := range wpa.WebPPictures {
WebPPictureFree(webpPicture)
}
WebPAnimEncoderDelete(wpa.AnimationEncoder)
}
// AddFrame add frame to animation
func (wpa *WebpAnimation) AddFrame(img image.Image, timestamp int, webpcfg WebPConfig) error {
var webPPicture *WebPPicture = nil
var m *image.RGBA
if img != nil {
if v, ok := img.(*image.RGBA); ok {
m = v
} else {
b := img.Bounds()
m = image.NewRGBA(image.Rect(0, 0, b.Dx(), b.Dy()))
draw.Draw(m, m.Bounds(), img, b.Min, draw.Src)
}
webPPicture = &WebPPicture{}
wpa.WebPPictures = append(wpa.WebPPictures, webPPicture)
webPPicture.SetUseArgb(1)
webPPicture.SetHeight(wpa.Height)
webPPicture.SetWidth(wpa.Width)
err := WebPPictureImportRGBA(m.Pix, m.Stride, webPPicture)
if err != nil {
return err
}
}
res := WebPAnimEncoderAdd(wpa.AnimationEncoder, webPPicture, timestamp, webpcfg)
if res == 0 {
return errors.New("Failed to add frame in animation ecoder")
}
return nil
}
// Encode encode animation
func (wpa *WebpAnimation) Encode(w io.Writer) error {
wpa.WebPData = &WebPData{}
WebPDataInit(wpa.WebPData)
WebPAnimEncoderAssemble(wpa.AnimationEncoder, wpa.WebPData)
if wpa.loopCount > 0 {
wpa.WebPMux = WebPMuxCreateInternal(wpa.WebPData, 1)
if wpa.WebPMux == nil {
return errors.New("ERROR: Could not re-mux to add loop count/metadata.")
}
WebPDataClear(wpa.WebPData)
webPMuxAnimNewParams := WebPMuxAnimParams{}
muxErr := WebPMuxGetAnimationParams(wpa.WebPMux, &webPMuxAnimNewParams)
if muxErr != WebpMuxOk {
return errors.New("Could not fetch loop count")
}
webPMuxAnimNewParams.SetLoopCount(wpa.loopCount)
muxErr = WebPMuxSetAnimationParams(wpa.WebPMux, &webPMuxAnimNewParams)
if muxErr != WebpMuxOk {
return errors.New(fmt.Sprint("Could not update loop count, code:", muxErr))
}
muxErr = WebPMuxAssemble(wpa.WebPMux, wpa.WebPData)
if muxErr != WebpMuxOk {
return errors.New("Could not assemble when re-muxing to add")
}
}
_, err := w.Write(wpa.WebPData.GetBytes())
return err
}
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