Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/app/imaging/utils_bench_test.go

@@ -0,0 +1,103 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package imaging
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+	"testing"
+)
+
+func fillImageTransparencyOld(img image.Image, c color.Color) {
+	dst := image.NewRGBA(img.Bounds())
+	draw.Draw(dst, dst.Bounds(), image.NewUniform(color.White), image.Point{}, draw.Src)
+	draw.Draw(dst, dst.Bounds(), img, img.Bounds().Min, draw.Over)
+}
+
+func fullyOpaqueGen(w, h int) func() image.Image {
+	return func() image.Image {
+		dst := image.NewRGBA(image.Rect(0, 0, w, h))
+		draw.Draw(dst, dst.Bounds(), image.NewUniform(color.White), image.Point{}, draw.Src)
+		return dst
+	}
+}
+
+func partiallyOpaqueGen(w, h int) func() image.Image {
+	return func() image.Image {
+		dst := image.NewRGBA(image.Rect(0, 0, w, h))
+		draw.Draw(dst, image.Rect(0, 0, w/2, h/2), image.NewUniform(color.White), image.Point{}, draw.Src)
+		return dst
+	}
+}
+
+func fullyTransparentGen(w, h int) func() image.Image {
+	return func() image.Image {
+		return image.NewRGBA(image.Rect(0, 0, w, h))
+	}
+}
+
+func fullyOpaquePaletteGen(w, h int) func() image.Image {
+	return func() image.Image {
+		return image.NewPaletted(image.Rect(0, 0, w, h), []color.Color{image.White})
+	}
+}
+
+func fullyTransparentPaletteGen(w, h int) func() image.Image {
+	return func() image.Image {
+		return image.NewPaletted(image.Rect(0, 0, w, h), []color.Color{image.Transparent})
+	}
+}
+
+var tcs = []struct {
+	name   string
+	imgGen func() image.Image
+}{
+	{
+		"10MPx fully transparent RGBA",
+		fullyTransparentGen(1000, 1000),
+	},
+	{
+		"10MPx partially opaque RGBA",
+		partiallyOpaqueGen(1000, 1000),
+	},
+	{
+		"10MPx fully opaque RGBA",
+		fullyOpaqueGen(1000, 1000),
+	},
+	{
+		"10MPx fully opaque palette",
+		fullyOpaquePaletteGen(1000, 1000),
+	},
+	{
+		"10MPx fully transparent palette",
+		fullyTransparentPaletteGen(1000, 1000),
+	},
+}
+
+func BenchmarkFillImageTransparency(b *testing.B) {
+	for _, tc := range tcs {
+		b.Run(tc.name, func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				b.StopTimer()
+				img := tc.imgGen()
+				b.StartTimer()
+				FillImageTransparency(img, image.White)
+			}
+		})
+	}
+}
+
+func BenchmarkFillImageTransparencyOld(b *testing.B) {
+	for _, tc := range tcs {
+		b.Run(tc.name, func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				b.StopTimer()
+				img := tc.imgGen()
+				b.StartTimer()
+				fillImageTransparencyOld(img, image.White)
+			}
+		})
+	}
+}