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encode: quantized palette for GIFs #293

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merged 1 commit into from
Jun 8, 2022
Merged

encode: quantized palette for GIFs #293

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30 changes: 4 additions & 26 deletions encode/encode.go
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Original file line number Diff line number Diff line change
Expand Up @@ -6,9 +6,11 @@ import (
"fmt"
"image"
"image/color"
"image/draw"
"image/gif"
"time"

"github.com/ericpauley/go-quantize/quantize"
"github.com/pkg/errors"
"github.com/tidbyt/go-libwebp/webp"
"github.com/vmihailenco/msgpack/v5"
Expand Down Expand Up @@ -147,33 +149,9 @@ func (s *Screens) EncodeGIF(filters ...ImageFilter) ([]byte, error) {
return nil, fmt.Errorf("image %d is %T, require RGBA", imIdx, im)
}

palette := color.Palette{}
idxByColor := map[color.RGBA]int{}

// Create the palette
for x := 0; x < imRGBA.Bounds().Dx(); x++ {
for y := 0; y < imRGBA.Bounds().Dy(); y++ {
c := imRGBA.RGBAAt(x, y)
if _, found := idxByColor[c]; !found {
idxByColor[c] = len(palette)
palette = append(palette, c)
}
}
}
if len(palette) > 256 {
return nil, fmt.Errorf(
"require <=256 colors, found %d in image %d",
len(palette), imIdx,
)
}

// Construct the paletted image
palette := quantize.MedianCutQuantizer{}.Quantize(make([]color.Color, 0, 256), im)
imPaletted := image.NewPaletted(imRGBA.Bounds(), palette)
for x := 0; x < imRGBA.Bounds().Dx(); x++ {
for y := 0; y < imRGBA.Bounds().Dy(); y++ {
imPaletted.SetColorIndex(x, y, uint8(idxByColor[imRGBA.RGBAAt(x, y)]))
}
}
draw.Draw(imPaletted, imRGBA.Bounds(), imRGBA, image.Point{0, 0}, draw.Src)

g.Image = append(g.Image, imPaletted)
g.Delay = append(g.Delay, int(s.delay/10)) // in 100ths of a second
Expand Down
1 change: 1 addition & 0 deletions go.mod
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Expand Up @@ -5,6 +5,7 @@ go 1.16
require (
github.com/antchfx/xmlquery v1.3.11
github.com/dustin/go-humanize v1.0.0
github.com/ericpauley/go-quantize v0.0.0-20200331213906-ae555eb2afa4 // indirect
github.com/fogleman/gg v1.3.0
github.com/fsnotify/fsnotify v1.5.4
github.com/go-playground/validator/v10 v10.11.0
Expand Down
2 changes: 2 additions & 0 deletions go.sum
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Expand Up @@ -132,6 +132,8 @@ github.com/envoyproxy/go-control-plane v0.9.10-0.20210907150352-cf90f659a021/go.
github.com/envoyproxy/go-control-plane v0.10.1/go.mod h1:AY7fTTXNdv/aJ2O5jwpxAPOWUZ7hQAEvzN5Pf27BkQQ=
github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
github.com/envoyproxy/protoc-gen-validate v0.6.2/go.mod h1:2t7qjJNvHPx8IjnBOzl9E9/baC+qXE/TeeyBRzgJDws=
github.com/ericpauley/go-quantize v0.0.0-20200331213906-ae555eb2afa4 h1:BBade+JlV/f7JstZ4pitd4tHhpN+w+6I+LyOS7B4fyU=
github.com/ericpauley/go-quantize v0.0.0-20200331213906-ae555eb2afa4/go.mod h1:H7chHJglrhPPzetLdzBleF8d22WYOv7UM/lEKYiwlKM=
github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
Expand Down