image: optimize Image.At().RGBA() #15759
Description
In the Go standard library (and x/image), we can see several calls that look like Image.At().RGBA().
These calls mostly happen in y/x loops.
They are slow because they allocate memory.
I have written a library that speeds up Image.At().RGBA().
It is available on https://github.com/pierrre/imageutil
If you call https://godoc.org/github.com/pierrre/imageutil#NewAtFunc with an image, it returns a https://godoc.org/github.com/pierrre/imageutil#AtFunc
A AtFunc returns the RGBA value (uint32) for a given pixel (x/y).
A call to NewAtFunc() allocates memory, but it only happens 1 time per image.
A call to a AtFunc doesn't allocate memory (most of the time).
There is also NewSetFunc() that helps to set RGBA values to an image.
It works the same way.
My code is just a copy/paste of the Go standard library, but organized differently.
Benchmarks!
I've written benchmarks for "encode" functions.
It only tests blank images, but it will give you an idea.
package benchimageencode
import (
"bytes"
"image"
"image/color"
"image/gif"
"image/jpeg"
"image/png"
"io"
"strconv"
"testing"
"golang.org/x/image/bmp"
"golang.org/x/image/tiff"
)
func Benchmark(b *testing.B) {
buf := new(bytes.Buffer)
for _, tcEnc := range []struct {
name string
enc func(w io.Writer, im image.Image) error
}{
{
"JPEG",
func(w io.Writer, im image.Image) error {
return jpeg.Encode(w, im, nil)
},
},
{"PNG", png.Encode},
{
"GIF",
func(w io.Writer, im image.Image) error {
return gif.Encode(w, im, nil)
},
},
{"BMP", bmp.Encode},
{
"TIFF",
func(w io.Writer, im image.Image) error {
return tiff.Encode(w, im, nil)
},
},
} {
b.Run(tcEnc.name, func(b *testing.B) {
for _, tcIm := range []struct {
name string
newImage func(image.Rectangle) image.Image
}{
{
"RGBA",
func(r image.Rectangle) image.Image {
return image.NewRGBA(r)
},
},
{
"RGBA64",
func(r image.Rectangle) image.Image {
return image.NewRGBA64(r)
},
},
{
"NRGBA",
func(r image.Rectangle) image.Image {
return image.NewNRGBA(r)
},
},
{
"NRGBA64",
func(r image.Rectangle) image.Image {
return image.NewNRGBA64(r)
},
},
{
"Alpha",
func(r image.Rectangle) image.Image {
return image.NewAlpha(r)
},
},
{
"Alpha16",
func(r image.Rectangle) image.Image {
return image.NewAlpha16(r)
},
},
{
"Gray",
func(r image.Rectangle) image.Image {
return image.NewGray(r)
},
},
{
"Gray16",
func(r image.Rectangle) image.Image {
return image.NewGray16(r)
},
},
{
"Paletted",
func(r image.Rectangle) image.Image {
return image.NewPaletted(r, color.Palette{
color.RGBA{R: 0x00, G: 0x00, B: 0x00, A: 0xFF},
color.RGBA{R: 0xFF, G: 0x00, B: 0x00, A: 0xFF},
color.RGBA{R: 0x00, G: 0xFF, B: 0x00, A: 0xFF},
color.RGBA{R: 0x00, G: 0x00, B: 0xFF, A: 0xFF},
})
},
},
{
"YCbCr",
func(r image.Rectangle) image.Image {
return image.NewYCbCr(r, image.YCbCrSubsampleRatio444)
},
},
{
"NYCbCrA",
func(r image.Rectangle) image.Image {
return image.NewNYCbCrA(r, image.YCbCrSubsampleRatio444)
},
},
{
"CMYK",
func(r image.Rectangle) image.Image {
return image.NewCMYK(r)
},
},
} {
b.Run(tcIm.name, func(b *testing.B) {
for _, size := range []int{
10, 100, 1000,
} {
im := tcIm.newImage(image.Rect(0, 0, size, size))
b.Run(strconv.Itoa(size), func(b *testing.B) {
for i := 0; i < b.N; i++ {
buf.Reset()
err := tcEnc.enc(buf, im)
if err != nil {
b.Fatal(err)
}
}
})
}
})
}
})
}
}Results:
benchmark old ns/op new ns/op delta
Benchmark/JPEG/RGBA/10-8 6891 6922 +0.45%
Benchmark/JPEG/RGBA/100-8 243797 226064 -7.27%
Benchmark/JPEG/RGBA/1000-8 18211697 18183751 -0.15%
Benchmark/JPEG/RGBA64/10-8 15505 8078 -47.90%
Benchmark/JPEG/RGBA64/100-8 654661 284739 -56.51%
Benchmark/JPEG/RGBA64/1000-8 51987889 22906425 -55.94%
Benchmark/JPEG/NRGBA/10-8 15891 7327 -53.89%
Benchmark/JPEG/NRGBA/100-8 646659 257388 -60.20%
Benchmark/JPEG/NRGBA/1000-8 53610219 20396700 -61.95%
Benchmark/JPEG/NRGBA64/10-8 16586 7310 -55.93%
Benchmark/JPEG/NRGBA64/100-8 718770 256065 -64.37%
Benchmark/JPEG/NRGBA64/1000-8 55099237 20160389 -63.41%
Benchmark/JPEG/Alpha/10-8 13366 7624 -42.96%
Benchmark/JPEG/Alpha/100-8 535532 274982 -48.65%
Benchmark/JPEG/Alpha/1000-8 43495216 21314882 -50.99%
Benchmark/JPEG/Alpha16/10-8 14041 7849 -44.10%
Benchmark/JPEG/Alpha16/100-8 567633 271382 -52.19%
Benchmark/JPEG/Alpha16/1000-8 46175342 21845906 -52.69%
Benchmark/JPEG/Gray/10-8 4124 4114 -0.24%
Benchmark/JPEG/Gray/100-8 80502 81061 +0.69%
Benchmark/JPEG/Gray/1000-8 7237756 7227977 -0.14%
Benchmark/JPEG/Gray16/10-8 13816 7688 -44.35%
Benchmark/JPEG/Gray16/100-8 565986 273270 -51.72%
Benchmark/JPEG/Gray16/1000-8 46435379 21609969 -53.46%
Benchmark/JPEG/Paletted/10-8 9504 7861 -17.29%
Benchmark/JPEG/Paletted/100-8 339095 277612 -18.13%
Benchmark/JPEG/Paletted/1000-8 27374214 22215206 -18.85%
Benchmark/JPEG/YCbCr/10-8 16747 8353 -50.12%
Benchmark/JPEG/YCbCr/100-8 693129 293951 -57.59%
Benchmark/JPEG/YCbCr/1000-8 56055246 23340037 -58.36%
Benchmark/JPEG/NYCbCrA/10-8 17758 9100 -48.76%
Benchmark/JPEG/NYCbCrA/100-8 753606 331801 -55.97%
Benchmark/JPEG/NYCbCrA/1000-8 61176716 27043470 -55.79%
Benchmark/JPEG/CMYK/10-8 16301 8968 -44.98%
Benchmark/JPEG/CMYK/100-8 664311 332938 -49.88%
Benchmark/JPEG/CMYK/1000-8 53249646 26513162 -50.21%
Benchmark/PNG/RGBA/10-8 233825 234277 +0.19%
Benchmark/PNG/RGBA/100-8 1318376 1244438 -5.61%
Benchmark/PNG/RGBA/1000-8 87804961 87500804 -0.35%
Benchmark/PNG/RGBA64/10-8 234305 241012 +2.86%
Benchmark/PNG/RGBA64/100-8 1560487 1571785 +0.72%
Benchmark/PNG/RGBA64/1000-8 116953559 115641713 -1.12%
Benchmark/PNG/NRGBA/10-8 224863 215643 -4.10%
Benchmark/PNG/NRGBA/100-8 543683 477847 -12.11%
Benchmark/PNG/NRGBA/1000-8 22236178 22087216 -0.67%
Benchmark/PNG/NRGBA64/10-8 278971 229319 -17.80%
Benchmark/PNG/NRGBA64/100-8 1338571 1344189 +0.42%
Benchmark/PNG/NRGBA64/1000-8 94600702 92419064 -2.31%
Benchmark/PNG/Alpha/10-8 226913 235867 +3.95%
Benchmark/PNG/Alpha/100-8 1237592 1212220 -2.05%
Benchmark/PNG/Alpha/1000-8 87412677 86772330 -0.73%
Benchmark/PNG/Alpha16/10-8 238503 230353 -3.42%
Benchmark/PNG/Alpha16/100-8 1534150 1577323 +2.81%
Benchmark/PNG/Alpha16/1000-8 114207844 113559204 -0.57%
Benchmark/PNG/Gray/10-8 240275 224893 -6.40%
Benchmark/PNG/Gray/100-8 349896 319882 -8.58%
Benchmark/PNG/Gray/1000-8 5872431 5918043 +0.78%
Benchmark/PNG/Gray16/10-8 232315 219746 -5.41%
Benchmark/PNG/Gray16/100-8 856544 922971 +7.76%
Benchmark/PNG/Gray16/1000-8 51153358 50292261 -1.68%
Benchmark/PNG/Paletted/10-8 222739 229109 +2.86%
Benchmark/PNG/Paletted/100-8 320867 322279 +0.44%
Benchmark/PNG/Paletted/1000-8 5880143 5995715 +1.97%
Benchmark/PNG/YCbCr/10-8 264396 229815 -13.08%
Benchmark/PNG/YCbCr/100-8 1119731 944250 -15.67%
Benchmark/PNG/YCbCr/1000-8 72874727 42894471 -41.14%
Benchmark/PNG/NYCbCrA/10-8 254977 239658 -6.01%
Benchmark/PNG/NYCbCrA/100-8 1646790 1662818 +0.97%
Benchmark/PNG/NYCbCrA/1000-8 126894096 125769798 -0.89%
Benchmark/PNG/CMYK/10-8 288477 227636 -21.09%
Benchmark/PNG/CMYK/100-8 1050239 883844 -15.84%
Benchmark/PNG/CMYK/1000-8 68309463 42997860 -37.05%
Benchmark/BMP/RGBA/10-8 2357 2337 -0.85%
Benchmark/BMP/RGBA/100-8 19857 19835 -0.11%
Benchmark/BMP/RGBA/1000-8 1699880 1658537 -2.43%
Benchmark/BMP/RGBA64/10-8 5892 2893 -50.90%
Benchmark/BMP/RGBA64/100-8 370764 72362 -80.48%
Benchmark/BMP/RGBA64/1000-8 37558621 6772522 -81.97%
Benchmark/BMP/NRGBA/10-8 5587 2754 -50.71%
Benchmark/BMP/NRGBA/100-8 330937 57430 -82.65%
Benchmark/BMP/NRGBA/1000-8 32697775 5413184 -83.44%
Benchmark/BMP/NRGBA64/10-8 6067 2779 -54.19%
Benchmark/BMP/NRGBA64/100-8 379282 59023 -84.44%
Benchmark/BMP/NRGBA64/1000-8 36784396 5547886 -84.92%
Benchmark/BMP/Alpha/10-8 4947 2691 -45.60%
Benchmark/BMP/Alpha/100-8 268719 54878 -79.58%
Benchmark/BMP/Alpha/1000-8 26591321 5049983 -81.01%
Benchmark/BMP/Alpha16/10-8 5236 2747 -47.54%
Benchmark/BMP/Alpha16/100-8 290536 57670 -80.15%
Benchmark/BMP/Alpha16/1000-8 28806912 5421961 -81.18%
Benchmark/BMP/Gray/10-8 3576 3575 -0.03%
Benchmark/BMP/Gray/100-8 4829 4768 -1.26%
Benchmark/BMP/Gray/1000-8 58899 57669 -2.09%
Benchmark/BMP/Gray16/10-8 5166 2781 -46.17%
Benchmark/BMP/Gray16/100-8 287760 57665 -79.96%
Benchmark/BMP/Gray16/1000-8 28462012 5463188 -80.81%
Benchmark/BMP/Paletted/10-8 3210 3358 +4.61%
Benchmark/BMP/Paletted/100-8 4386 4546 +3.65%
Benchmark/BMP/Paletted/1000-8 58090 58225 +0.23%
Benchmark/BMP/YCbCr/10-8 6046 2999 -50.40%
Benchmark/BMP/YCbCr/100-8 387509 79009 -79.61%
Benchmark/BMP/YCbCr/1000-8 38474751 7584745 -80.29%
Benchmark/BMP/NYCbCrA/10-8 6739 3387 -49.74%
Benchmark/BMP/NYCbCrA/100-8 462438 116874 -74.73%
Benchmark/BMP/NYCbCrA/1000-8 45898191 11495621 -74.95%
Benchmark/BMP/CMYK/10-8 5594 3105 -44.49%
Benchmark/BMP/CMYK/100-8 339544 90794 -73.26%
Benchmark/BMP/CMYK/1000-8 33004703 8738049 -73.52%
Benchmark/TIFF/RGBA/10-8 2312 2509 +8.52%
Benchmark/TIFF/RGBA/100-8 4122 3509 -14.87%
Benchmark/TIFF/RGBA/1000-8 295062 288624 -2.18%
Benchmark/TIFF/RGBA64/10-8 2698 2657 -1.52%
Benchmark/TIFF/RGBA64/100-8 63975 65120 +1.79%
Benchmark/TIFF/RGBA64/1000-8 6303790 6177960 -2.00%
Benchmark/TIFF/NRGBA/10-8 1867 1850 -0.91%
Benchmark/TIFF/NRGBA/100-8 2997 3031 +1.13%
Benchmark/TIFF/NRGBA/1000-8 293275 297403 +1.41%
Benchmark/TIFF/NRGBA64/10-8 2641 2737 +3.63%
Benchmark/TIFF/NRGBA64/100-8 64303 64035 -0.42%
Benchmark/TIFF/NRGBA64/1000-8 6227868 6260150 +0.52%
Benchmark/TIFF/Alpha/10-8 4791 2631 -45.08%
Benchmark/TIFF/Alpha/100-8 270968 60194 -77.79%
Benchmark/TIFF/Alpha/1000-8 26615543 5647306 -78.78%
Benchmark/TIFF/Alpha16/10-8 5037 2701 -46.38%
Benchmark/TIFF/Alpha16/100-8 293523 68395 -76.70%
Benchmark/TIFF/Alpha16/1000-8 29014088 6497133 -77.61%
Benchmark/TIFF/Gray/10-8 1481 1431 -3.38%
Benchmark/TIFF/Gray/100-8 1652 1657 +0.30%
Benchmark/TIFF/Gray/1000-8 36243 38499 +6.22%
Benchmark/TIFF/Gray16/10-8 1728 1826 +5.67%
Benchmark/TIFF/Gray16/100-8 19916 20041 +0.63%
Benchmark/TIFF/Gray16/1000-8 1682497 1682254 -0.01%
Benchmark/TIFF/Paletted/10-8 4276 4374 +2.29%
Benchmark/TIFF/Paletted/100-8 4759 4690 -1.45%
Benchmark/TIFF/Paletted/1000-8 39673 39281 -0.99%
Benchmark/TIFF/YCbCr/10-8 5862 2863 -51.16%
Benchmark/TIFF/YCbCr/100-8 383112 90709 -76.32%
Benchmark/TIFF/YCbCr/1000-8 37969567 8576337 -77.41%
Benchmark/TIFF/NYCbCrA/10-8 6511 3511 -46.08%
Benchmark/TIFF/NYCbCrA/100-8 454029 125287 -72.41%
Benchmark/TIFF/NYCbCrA/1000-8 45109329 11977360 -73.45%
Benchmark/TIFF/CMYK/10-8 5431 3017 -44.45%
Benchmark/TIFF/CMYK/100-8 331066 96960 -70.71%
Benchmark/TIFF/CMYK/1000-8 33648362 9402967 -72.06%
benchmark old allocs new allocs delta
Benchmark/JPEG/RGBA/10-8 4 5 +25.00%
Benchmark/JPEG/RGBA/100-8 4 5 +25.00%
Benchmark/JPEG/RGBA/1000-8 4 5 +25.00%
Benchmark/JPEG/RGBA64/10-8 260 5 -98.08%
Benchmark/JPEG/RGBA64/100-8 12548 5 -99.96%
Benchmark/JPEG/RGBA64/1000-8 1016068 5 -100.00%
Benchmark/JPEG/NRGBA/10-8 260 5 -98.08%
Benchmark/JPEG/NRGBA/100-8 12548 5 -99.96%
Benchmark/JPEG/NRGBA/1000-8 1016068 5 -100.00%
Benchmark/JPEG/NRGBA64/10-8 260 5 -98.08%
Benchmark/JPEG/NRGBA64/100-8 12548 5 -99.96%
Benchmark/JPEG/NRGBA64/1000-8 1016068 5 -100.00%
Benchmark/JPEG/Alpha/10-8 260 5 -98.08%
Benchmark/JPEG/Alpha/100-8 12548 5 -99.96%
Benchmark/JPEG/Alpha/1000-8 1016068 5 -100.00%
Benchmark/JPEG/Alpha16/10-8 260 5 -98.08%
Benchmark/JPEG/Alpha16/100-8 12548 5 -99.96%
Benchmark/JPEG/Alpha16/1000-8 1016068 5 -100.00%
Benchmark/JPEG/Gray/10-8 4 4 +0.00%
Benchmark/JPEG/Gray/100-8 4 4 +0.00%
Benchmark/JPEG/Gray/1000-8 4 4 +0.00%
Benchmark/JPEG/Gray16/10-8 260 5 -98.08%
Benchmark/JPEG/Gray16/100-8 12548 5 -99.96%
Benchmark/JPEG/Gray16/1000-8 1016068 5 -100.00%
Benchmark/JPEG/Paletted/10-8 4 6 +50.00%
Benchmark/JPEG/Paletted/100-8 4 6 +50.00%
Benchmark/JPEG/Paletted/1000-8 4 6 +50.00%
Benchmark/JPEG/YCbCr/10-8 260 5 -98.08%
Benchmark/JPEG/YCbCr/100-8 12548 5 -99.96%
Benchmark/JPEG/YCbCr/1000-8 1016068 5 -100.00%
Benchmark/JPEG/NYCbCrA/10-8 260 5 -98.08%
Benchmark/JPEG/NYCbCrA/100-8 12548 5 -99.96%
Benchmark/JPEG/NYCbCrA/1000-8 1016068 5 -100.00%
Benchmark/JPEG/CMYK/10-8 260 5 -98.08%
Benchmark/JPEG/CMYK/100-8 12548 5 -99.96%
Benchmark/JPEG/CMYK/1000-8 1016068 5 -100.00%
Benchmark/PNG/RGBA/10-8 232 233 +0.43%
Benchmark/PNG/RGBA/100-8 20032 20033 +0.00%
Benchmark/PNG/RGBA/1000-8 2000032 2000033 +0.00%
Benchmark/PNG/RGBA64/10-8 232 233 +0.43%
Benchmark/PNG/RGBA64/100-8 20032 20033 +0.00%
Benchmark/PNG/RGBA64/1000-8 2000032 2000033 +0.00%
Benchmark/PNG/NRGBA/10-8 32 33 +3.12%
Benchmark/PNG/NRGBA/100-8 32 33 +3.12%
Benchmark/PNG/NRGBA/1000-8 32 33 +3.12%
Benchmark/PNG/NRGBA64/10-8 132 133 +0.76%
Benchmark/PNG/NRGBA64/100-8 10032 10033 +0.01%
Benchmark/PNG/NRGBA64/1000-8 1000032 1000033 +0.00%
Benchmark/PNG/Alpha/10-8 232 233 +0.43%
Benchmark/PNG/Alpha/100-8 20032 20033 +0.00%
Benchmark/PNG/Alpha/1000-8 2000032 2000033 +0.00%
Benchmark/PNG/Alpha16/10-8 232 233 +0.43%
Benchmark/PNG/Alpha16/100-8 20032 20033 +0.00%
Benchmark/PNG/Alpha16/1000-8 2000032 2000033 +0.00%
Benchmark/PNG/Gray/10-8 32 33 +3.12%
Benchmark/PNG/Gray/100-8 32 33 +3.12%
Benchmark/PNG/Gray/1000-8 32 33 +3.12%
Benchmark/PNG/Gray16/10-8 132 133 +0.76%
Benchmark/PNG/Gray16/100-8 10032 10033 +0.01%
Benchmark/PNG/Gray16/1000-8 1000032 1000033 +0.00%
Benchmark/PNG/Paletted/10-8 38 40 +5.26%
Benchmark/PNG/Paletted/100-8 38 40 +5.26%
Benchmark/PNG/Paletted/1000-8 38 40 +5.26%
Benchmark/PNG/YCbCr/10-8 132 33 -75.00%
Benchmark/PNG/YCbCr/100-8 10032 33 -99.67%
Benchmark/PNG/YCbCr/1000-8 1000032 33 -100.00%
Benchmark/PNG/NYCbCrA/10-8 232 233 +0.43%
Benchmark/PNG/NYCbCrA/100-8 20032 20033 +0.00%
Benchmark/PNG/NYCbCrA/1000-8 2000032 2000033 +0.00%
Benchmark/PNG/CMYK/10-8 132 33 -75.00%
Benchmark/PNG/CMYK/100-8 10032 33 -99.67%
Benchmark/PNG/CMYK/1000-8 1000032 33 -100.00%
Benchmark/BMP/RGBA/10-8 33 33 +0.00%
Benchmark/BMP/RGBA/100-8 33 33 +0.00%
Benchmark/BMP/RGBA/1000-8 33 33 +0.00%
Benchmark/BMP/RGBA64/10-8 133 34 -74.44%
Benchmark/BMP/RGBA64/100-8 10033 34 -99.66%
Benchmark/BMP/RGBA64/1000-8 1000033 34 -100.00%
Benchmark/BMP/NRGBA/10-8 133 34 -74.44%
Benchmark/BMP/NRGBA/100-8 10033 34 -99.66%
Benchmark/BMP/NRGBA/1000-8 1000033 34 -100.00%
Benchmark/BMP/NRGBA64/10-8 133 34 -74.44%
Benchmark/BMP/NRGBA64/100-8 10033 34 -99.66%
Benchmark/BMP/NRGBA64/1000-8 1000033 34 -100.00%
Benchmark/BMP/Alpha/10-8 133 34 -74.44%
Benchmark/BMP/Alpha/100-8 10033 34 -99.66%
Benchmark/BMP/Alpha/1000-8 1000033 34 -100.00%
Benchmark/BMP/Alpha16/10-8 133 34 -74.44%
Benchmark/BMP/Alpha16/100-8 10033 34 -99.66%
Benchmark/BMP/Alpha16/1000-8 1000033 34 -100.00%
Benchmark/BMP/Gray/10-8 37 37 +0.00%
Benchmark/BMP/Gray/100-8 36 36 +0.00%
Benchmark/BMP/Gray/1000-8 36 36 +0.00%
Benchmark/BMP/Gray16/10-8 133 34 -74.44%
Benchmark/BMP/Gray16/100-8 10033 34 -99.66%
Benchmark/BMP/Gray16/1000-8 1000033 34 -100.00%
Benchmark/BMP/Paletted/10-8 37 37 +0.00%
Benchmark/BMP/Paletted/100-8 36 36 +0.00%
Benchmark/BMP/Paletted/1000-8 36 36 +0.00%
Benchmark/BMP/YCbCr/10-8 133 34 -74.44%
Benchmark/BMP/YCbCr/100-8 10033 34 -99.66%
Benchmark/BMP/YCbCr/1000-8 1000033 34 -100.00%
Benchmark/BMP/NYCbCrA/10-8 133 34 -74.44%
Benchmark/BMP/NYCbCrA/100-8 10033 34 -99.66%
Benchmark/BMP/NYCbCrA/1000-8 1000033 34 -100.00%
Benchmark/BMP/CMYK/10-8 133 34 -74.44%
Benchmark/BMP/CMYK/100-8 10033 34 -99.66%
Benchmark/BMP/CMYK/1000-8 1000033 34 -100.00%
Benchmark/TIFF/RGBA/10-8 25 25 +0.00%
Benchmark/TIFF/RGBA/100-8 25 25 +0.00%
Benchmark/TIFF/RGBA/1000-8 25 25 +0.00%
Benchmark/TIFF/RGBA64/10-8 27 27 +0.00%
Benchmark/TIFF/RGBA64/100-8 27 27 +0.00%
Benchmark/TIFF/RGBA64/1000-8 27 27 +0.00%
Benchmark/TIFF/NRGBA/10-8 25 25 +0.00%
Benchmark/TIFF/NRGBA/100-8 25 25 +0.00%
Benchmark/TIFF/NRGBA/1000-8 25 25 +0.00%
Benchmark/TIFF/NRGBA64/10-8 27 27 +0.00%
Benchmark/TIFF/NRGBA64/100-8 27 27 +0.00%
Benchmark/TIFF/NRGBA64/1000-8 27 27 +0.00%
Benchmark/TIFF/Alpha/10-8 126 27 -78.57%
Benchmark/TIFF/Alpha/100-8 10026 27 -99.73%
Benchmark/TIFF/Alpha/1000-8 1000026 27 -100.00%
Benchmark/TIFF/Alpha16/10-8 126 27 -78.57%
Benchmark/TIFF/Alpha16/100-8 10026 27 -99.73%
Benchmark/TIFF/Alpha16/1000-8 1000026 27 -100.00%
Benchmark/TIFF/Gray/10-8 24 24 +0.00%
Benchmark/TIFF/Gray/100-8 24 24 +0.00%
Benchmark/TIFF/Gray/1000-8 24 24 +0.00%
Benchmark/TIFF/Gray16/10-8 25 25 +0.00%
Benchmark/TIFF/Gray16/100-8 25 25 +0.00%
Benchmark/TIFF/Gray16/1000-8 25 25 +0.00%
Benchmark/TIFF/Paletted/10-8 27 27 +0.00%
Benchmark/TIFF/Paletted/100-8 27 27 +0.00%
Benchmark/TIFF/Paletted/1000-8 27 27 +0.00%
Benchmark/TIFF/YCbCr/10-8 126 27 -78.57%
Benchmark/TIFF/YCbCr/100-8 10026 27 -99.73%
Benchmark/TIFF/YCbCr/1000-8 1000026 27 -100.00%
Benchmark/TIFF/NYCbCrA/10-8 126 27 -78.57%
Benchmark/TIFF/NYCbCrA/100-8 10026 27 -99.73%
Benchmark/TIFF/NYCbCrA/1000-8 1000026 27 -100.00%
Benchmark/TIFF/CMYK/10-8 126 27 -78.57%
Benchmark/TIFF/CMYK/100-8 10026 27 -99.73%
Benchmark/TIFF/CMYK/1000-8 1000026 27 -100.00%
benchmark old bytes new bytes delta
Benchmark/JPEG/RGBA/10-8 4400 4416 +0.36%
Benchmark/JPEG/RGBA/100-8 4400 4416 +0.36%
Benchmark/JPEG/RGBA/1000-8 4400 4416 +0.36%
Benchmark/JPEG/RGBA64/10-8 6448 4416 -31.51%
Benchmark/JPEG/RGBA64/100-8 104752 4416 -95.78%
Benchmark/JPEG/RGBA64/1000-8 8132924 4416 -99.95%
Benchmark/JPEG/NRGBA/10-8 5424 4416 -18.58%
Benchmark/JPEG/NRGBA/100-8 54576 4416 -91.91%
Benchmark/JPEG/NRGBA/1000-8 4068676 4416 -99.89%
Benchmark/JPEG/NRGBA64/10-8 6448 4416 -31.51%
Benchmark/JPEG/NRGBA64/100-8 104752 4416 -95.78%
Benchmark/JPEG/NRGBA64/1000-8 8132924 4416 -99.95%
Benchmark/JPEG/Alpha/10-8 4656 4416 -5.15%
Benchmark/JPEG/Alpha/100-8 16944 4416 -73.94%
Benchmark/JPEG/Alpha/1000-8 1020471 4416 -99.57%
Benchmark/JPEG/Alpha16/10-8 4912 4416 -10.10%
Benchmark/JPEG/Alpha16/100-8 29488 4416 -85.02%
Benchmark/JPEG/Alpha16/1000-8 2036550 4416 -99.78%
Benchmark/JPEG/Gray/10-8 4400 4400 +0.00%
Benchmark/JPEG/Gray/100-8 4400 4400 +0.00%
Benchmark/JPEG/Gray/1000-8 4400 4400 +0.00%
Benchmark/JPEG/Gray16/10-8 4912 4416 -10.10%
Benchmark/JPEG/Gray16/100-8 29488 4416 -85.02%
Benchmark/JPEG/Gray16/1000-8 2036550 4416 -99.78%
Benchmark/JPEG/Paletted/10-8 4400 4512 +2.55%
Benchmark/JPEG/Paletted/100-8 4400 4512 +2.55%
Benchmark/JPEG/Paletted/1000-8 4400 4512 +2.55%
Benchmark/JPEG/YCbCr/10-8 5219 4416 -15.39%
Benchmark/JPEG/YCbCr/100-8 44541 4416 -90.09%
Benchmark/JPEG/YCbCr/1000-8 3255826 4416 -99.86%
Benchmark/JPEG/NYCbCrA/10-8 5424 4416 -18.58%
Benchmark/JPEG/NYCbCrA/100-8 54576 4416 -91.91%
Benchmark/JPEG/NYCbCrA/1000-8 4068676 4416 -99.89%
Benchmark/JPEG/CMYK/10-8 5424 4416 -18.58%
Benchmark/JPEG/CMYK/100-8 54576 4416 -91.91%
Benchmark/JPEG/CMYK/1000-8 4068674 4416 -99.89%
Benchmark/PNG/RGBA/10-8 848947 848963 +0.00%
Benchmark/PNG/RGBA/100-8 930357 930373 +0.00%
Benchmark/PNG/RGBA/1000-8 8872468 8872480 +0.00%
Benchmark/PNG/RGBA64/10-8 850035 850051 +0.00%
Benchmark/PNG/RGBA64/100-8 1013234 1013249 +0.00%
Benchmark/PNG/RGBA64/1000-8 16897030 16897052 +0.00%
Benchmark/PNG/NRGBA/10-8 848147 848163 +0.00%
Benchmark/PNG/NRGBA/100-8 850356 850372 +0.00%
Benchmark/PNG/NRGBA/1000-8 872433 872450 +0.00%
Benchmark/PNG/NRGBA64/10-8 849235 849251 +0.00%
Benchmark/PNG/NRGBA64/100-8 933237 933253 +0.00%
Benchmark/PNG/NRGBA64/1000-8 8897022 8897035 +0.00%
Benchmark/PNG/Alpha/10-8 848946 848963 +0.00%
Benchmark/PNG/Alpha/100-8 930357 930372 +0.00%
Benchmark/PNG/Alpha/1000-8 8872497 8872518 +0.00%
Benchmark/PNG/Alpha16/10-8 850027 850043 +0.00%
Benchmark/PNG/Alpha16/100-8 1013228 1013245 +0.00%
Benchmark/PNG/Alpha16/1000-8 16897088 16897084 -0.00%
Benchmark/PNG/Gray/10-8 847955 847971 +0.00%
Benchmark/PNG/Gray/100-8 848531 848548 +0.00%
Benchmark/PNG/Gray/1000-8 854008 854023 +0.00%
Benchmark/PNG/Gray16/10-8 848251 848267 +0.00%
Benchmark/PNG/Gray16/100-8 869107 869123 +0.00%
Benchmark/PNG/Gray16/1000-8 2860163 2860184 +0.00%
Benchmark/PNG/Paletted/10-8 848019 848131 +0.01%
Benchmark/PNG/Paletted/100-8 848595 848708 +0.01%
Benchmark/PNG/Paletted/1000-8 854069 854183 +0.01%
Benchmark/PNG/YCbCr/10-8 848563 848259 -0.04%
Benchmark/PNG/YCbCr/100-8 883701 851716 -3.62%
Benchmark/PNG/YCbCr/1000-8 4084742 884739 -78.34%
Benchmark/PNG/NYCbCrA/10-8 850027 850043 +0.00%
Benchmark/PNG/NYCbCrA/100-8 1013226 1013242 +0.00%
Benchmark/PNG/NYCbCrA/1000-8 16897044 16897067 +0.00%
Benchmark/PNG/CMYK/10-8 848643 848259 -0.05%
Benchmark/PNG/CMYK/100-8 891701 851717 -4.48%
Benchmark/PNG/CMYK/1000-8 4884737 884741 -81.89%
Benchmark/BMP/RGBA/10-8 400 400 +0.00%
Benchmark/BMP/RGBA/100-8 688 688 +0.00%
Benchmark/BMP/RGBA/1000-8 3440 3440 +0.00%
Benchmark/BMP/RGBA64/10-8 1200 416 -65.33%
Benchmark/BMP/RGBA64/100-8 80688 704 -99.13%
Benchmark/BMP/RGBA64/1000-8 8003450 3456 -99.96%
Benchmark/BMP/NRGBA/10-8 800 416 -48.00%
Benchmark/BMP/NRGBA/100-8 40688 704 -98.27%
Benchmark/BMP/NRGBA/1000-8 4003453 3456 -99.91%
Benchmark/BMP/NRGBA64/10-8 1200 416 -65.33%
Benchmark/BMP/NRGBA64/100-8 80688 704 -99.13%
Benchmark/BMP/NRGBA64/1000-8 8003451 3456 -99.96%
Benchmark/BMP/Alpha/10-8 504 416 -17.46%
Benchmark/BMP/Alpha/100-8 10688 704 -93.41%
Benchmark/BMP/Alpha/1000-8 1003446 3456 -99.66%
Benchmark/BMP/Alpha16/10-8 600 416 -30.67%
Benchmark/BMP/Alpha16/100-8 20688 704 -96.60%
Benchmark/BMP/Alpha16/1000-8 2003451 3456 -99.83%
Benchmark/BMP/Gray/10-8 2464 2464 +0.00%
Benchmark/BMP/Gray/100-8 2456 2456 +0.00%
Benchmark/BMP/Gray/1000-8 2456 2456 +0.00%
Benchmark/BMP/Gray16/10-8 600 416 -30.67%
Benchmark/BMP/Gray16/100-8 20688 704 -96.60%
Benchmark/BMP/Gray16/1000-8 2003450 3456 -99.83%
Benchmark/BMP/Paletted/10-8 2464 2464 +0.00%
Benchmark/BMP/Paletted/100-8 2456 2456 +0.00%
Benchmark/BMP/Paletted/1000-8 2456 2456 +0.00%
Benchmark/BMP/YCbCr/10-8 720 416 -42.22%
Benchmark/BMP/YCbCr/100-8 32688 704 -97.85%
Benchmark/BMP/YCbCr/1000-8 3203455 3456 -99.89%
Benchmark/BMP/NYCbCrA/10-8 800 416 -48.00%
Benchmark/BMP/NYCbCrA/100-8 40688 704 -98.27%
Benchmark/BMP/NYCbCrA/1000-8 4003454 3456 -99.91%
Benchmark/BMP/CMYK/10-8 800 416 -48.00%
Benchmark/BMP/CMYK/100-8 40688 704 -98.27%
Benchmark/BMP/CMYK/1000-8 4003453 3456 -99.91%
Benchmark/TIFF/RGBA/10-8 2800 2800 +0.00%
Benchmark/TIFF/RGBA/100-8 2800 2800 +0.00%
Benchmark/TIFF/RGBA/1000-8 2800 2800 +0.00%
Benchmark/TIFF/RGBA64/10-8 2896 2896 +0.00%
Benchmark/TIFF/RGBA64/100-8 3712 3712 +0.00%
Benchmark/TIFF/RGBA64/1000-8 11008 11008 +0.00%
Benchmark/TIFF/NRGBA/10-8 2800 2800 +0.00%
Benchmark/TIFF/NRGBA/100-8 2800 2800 +0.00%
Benchmark/TIFF/NRGBA/1000-8 2800 2800 +0.00%
Benchmark/TIFF/NRGBA64/10-8 2896 2896 +0.00%
Benchmark/TIFF/NRGBA64/100-8 3712 3712 +0.00%
Benchmark/TIFF/NRGBA64/1000-8 11008 11008 +0.00%
Benchmark/TIFF/Alpha/10-8 2960 2864 -3.24%
Benchmark/TIFF/Alpha/100-8 13216 3232 -75.54%
Benchmark/TIFF/Alpha/1000-8 1006898 6912 -99.31%
Benchmark/TIFF/Alpha16/10-8 3056 2864 -6.28%
Benchmark/TIFF/Alpha16/100-8 23216 3232 -86.08%
Benchmark/TIFF/Alpha16/1000-8 2006901 6912 -99.66%
Benchmark/TIFF/Gray/10-8 1784 1784 +0.00%
Benchmark/TIFF/Gray/100-8 1784 1784 +0.00%
Benchmark/TIFF/Gray/1000-8 1784 1784 +0.00%
Benchmark/TIFF/Gray16/10-8 1816 1816 +0.00%
Benchmark/TIFF/Gray16/100-8 1992 1992 +0.00%
Benchmark/TIFF/Gray16/1000-8 3832 3832 +0.00%
Benchmark/TIFF/Paletted/10-8 7928 7928 +0.00%
Benchmark/TIFF/Paletted/100-8 7928 7928 +0.00%
Benchmark/TIFF/Paletted/1000-8 7928 7928 +0.00%
Benchmark/TIFF/YCbCr/10-8 3184 2864 -10.05%
Benchmark/TIFF/YCbCr/100-8 35232 3232 -90.83%
Benchmark/TIFF/YCbCr/1000-8 3206914 6912 -99.78%
Benchmark/TIFF/NYCbCrA/10-8 3248 2864 -11.82%
Benchmark/TIFF/NYCbCrA/100-8 43216 3232 -92.52%
Benchmark/TIFF/NYCbCrA/1000-8 4006906 6912 -99.83%
Benchmark/TIFF/CMYK/10-8 3248 2864 -11.82%
Benchmark/TIFF/CMYK/100-8 43216 3232 -92.52%
Benchmark/TIFF/CMYK/1000-8 4006903 6912 -99.83%
My library should also speed up "copy" function (from an image type to another).
The modifications in the standard library and x/image are really straightforward:
- replace all
\.At\(.*\)\.RGBA\(\)to a call to aAtFunc - call
NewAtFunc()before a "y/x" loop
The image/jpeg.toYCbCr() is tricky.
You need to call NewAtFunc in image/jpeg.encoder.writeSOS() and pass the AtFunc to toYCbCr().
I also had to move my library to the standard library, because the go tool complained about bad imports...
As you can see: https://github.com/pierrre/imageutil
my code is tested and it returns the same results as the standard library.