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image/gif: speed up initializing test image

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The benchmark throughput numbers don't change, but the set-up time (the
time taken before the b.ResetTimer() call) drops from 460ms to 4ms.

Change-Id: I5a6756643dff6127f6d902455d83459c084834fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/237757
Reviewed-by: Rob Pike <r@golang.org>
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Nigel Tao 2020-06-13 12:28:08 +10:00
parent bd486c39ba
commit 9701910588
1 changed files with 2 additions and 5 deletions
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7
src/image/gif/writer_test.go
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@ -657,7 +657,6 @@ func TestEncodeWrappedImage(t *testing.T) {
}
func BenchmarkEncode(b *testing.B) {
bo := image.Rect(0, 0, 640, 480)
rnd := rand.New(rand.NewSource(123))
// Restrict to a 256-color paletted image to avoid quantization path.
@ -671,10 +670,8 @@ func BenchmarkEncode(b *testing.B) {
}
}
img := image.NewPaletted(image.Rect(0, 0, 640, 480), palette)
for y := bo.Min.Y; y < bo.Max.Y; y++ {
for x := bo.Min.X; x < bo.Max.X; x++ {
img.Set(x, y, palette[rnd.Intn(256)])
}
for i := range img.Pix {
img.Pix[i] = uint8(rnd.Intn(256))
}
b.SetBytes(640 * 480 * 4)