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Add "fastgif" image type that provides much faster (but lower quality) GIF quantization.

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The default image type is changed to PNG as it is the most "trouble free" choice.
This commit is contained in:
Hill Ma 2022-11-09 21:29:58 -08:00
parent a238a0ea6f
commit fec812bc32
3 changed files with 284 additions and 3 deletions
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260
fastgif_lut.go Normal file
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@ -0,0 +1,260 @@
package main
var FastGifLut = [256]int{
0,
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}

26
wrp.go
View File

@ -15,6 +15,7 @@ import (
"fmt"
"html/template"
"image"
"image/color/palette"
"image/gif"
"image/png"
"io/ioutil"
@ -129,7 +130,7 @@ func (rq *wrpReq) parseForm() {
rq.keys = rq.r.FormValue("k")
rq.buttons = rq.r.FormValue("Fn")
rq.imgType = rq.r.FormValue("t")
if rq.imgType != "gif" && rq.imgType != "png" {
if rq.imgType != "fastgif" && rq.imgType != "gif" && rq.imgType != "png" {
rq.imgType = defType
}
log.Printf("%s WrpReq from UI Form: %+v\n", rq.r.RemoteAddr, rq)
@ -288,6 +289,8 @@ func (rq *wrpReq) capture() {
var ssize string
var iw, ih int
switch rq.imgType {
case "fastgif":
fallthrough
case "gif":
i, err := png.Decode(bytes.NewReader(pngcap))
if err != nil {
@ -301,8 +304,25 @@ func (rq *wrpReq) capture() {
}
var gifbuf bytes.Buffer
st := time.Now()
q := median.Quantizer(rq.colors)
p := q.Paletted(i)
var p *image.Paletted
if rq.imgType == "fastgif" {
r := i.Bounds()
// NOTE: the color index computation below works only for palette.WebSafe!
p = image.NewPaletted(r, palette.WebSafe)
for y := 0; y != r.Dy(); y++ {
for x := 0; x != r.Dx(); x++ {
c := i.At(x, y)
r, g, b, _ := c.RGBA()
r6 := FastGifLut[r&0xff]
g6 := FastGifLut[g&0xff]
b6 := FastGifLut[b&0xff]
p.SetColorIndex(x, y, uint8(36*r6+6*g6+b6))
}
}
} else {
q := median.Quantizer(rq.colors)
p = q.Paletted(i)
}
err = gif.Encode(&gifbuf, p, &gif.Options{})
if err != nil {
log.Printf("%s Failed to encode GIF: %s\n", rq.r.RemoteAddr, err)

1
wrp.html
View File

@ -21,6 +21,7 @@
<OPTION VALUE="1.3" {{ if eq .Zoom 1.3}}SELECTED{{end}}>1.3 x</OPTION>
</SELECT>
T <SELECT NAME="t">
<OPTION VALUE="fastgif" {{ if eq .ImgType "fastgif"}}SELECTED{{end}}>Fast GIF</OPTION>
<OPTION VALUE="gif" {{ if eq .ImgType "gif"}}SELECTED{{end}}>GIF</OPTION>
<OPTION VALUE="png" {{ if eq .ImgType "png"}}SELECTED{{end}}>PNG</OPTION>
</SELECT>