Add little stresser that just draws as much 'random' stuff as possible

_demos/stress.go

@@ -0,0 +1,113 @@
+//go:build ignore
+// +build ignore
+
+// Copyright 2022 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// stress will fill the whole screen with random characters, colors and
+// formatting. The frames are pre-generated to draw as fast as possible.
+// ESC and Ctrl-C will end the program. Note that resizing isn't supported.
+package main
+
+import (
+	"fmt"
+	"math/rand"
+	"os"
+	"time"
+
+	"github.com/gdamore/tcell/v2"
+)
+
+func main() {
+	screen, err := tcell.NewScreen()
+	if err != nil {
+		panic(err)
+	}
+	if err := screen.Init(); err != nil {
+		panic(err)
+	}
+
+	startTime := time.Now()
+	var frames int
+
+	go func() {
+		for {
+			event := screen.PollEvent()
+			if event, ok := event.(*tcell.EventKey); ok {
+				if event.Key() == tcell.KeyCtrlC || event.Key() == tcell.KeyESC {
+					break
+				}
+			}
+		}
+
+		screen.Fini()
+
+		duration := time.Since(startTime)
+		fps := int(float64(frames) / duration.Seconds())
+		fmt.Println("FPS:", fps)
+
+		os.Exit(0)
+	}()
+
+	type cell struct {
+		c     rune
+		style tcell.Style
+	}
+
+	width, height := screen.Size()
+	glyphs := []rune{'@', '#', '&', '*', '=', '%', 'Z', 'A'}
+	attrs := []tcell.AttrMask{tcell.AttrBold, tcell.AttrReverse, tcell.AttrItalic, tcell.AttrNone}
+
+	// Pre-Generate 100 different frame patterns, so we stress the terminal as
+	// much as possible :D
+	var patterns [][][]*cell
+	for i := 0; i < 100; i++ {
+		pattern := make([][]*cell, height)
+		for h := 0; h < height; h++ {
+			row := make([]*cell, width)
+			for w := 0; w < width; w++ {
+				rF := int32(rand.Int() % 256)
+				gF := int32(rand.Int() % 256)
+				bF := int32(rand.Int() % 256)
+				rB := int32(rand.Int() % 256)
+				gB := int32(rand.Int() % 256)
+				bB := int32(rand.Int() % 256)
+
+				row[w] = &cell{
+					c: glyphs[rand.Int()%len(glyphs)],
+					style: tcell.StyleDefault.
+						Attributes(attrs[rand.Int()%len(attrs)]).
+						Background(tcell.NewRGBColor(rB, gB, bB)).
+						Foreground(tcell.NewRGBColor(rF, gF, bF)),
+				}
+			}
+			pattern[h] = row
+		}
+		patterns = append(patterns, pattern)
+	}
+
+	for {
+		for i := 0; i < len(patterns); i++ {
+			pattern := patterns[i]
+			for h := 0; h < height; h++ {
+				for w := 0; w < width; w++ {
+					c := pattern[h][w]
+					screen.SetContent(w, h, c.c, nil, c.style)
+				}
+			}
+			screen.Show()
+			frames++
+		}
+	}
+}