all: use bufio.NewWriter to improve writing speed

ebitenutil/gen.go

@@ -17,6 +17,7 @@
 package main
 
 import (
+	"bufio"
 	"fmt"
 	"image"
 	"image/color"
@@ -77,7 +78,11 @@ func run() error {
 	}
 	defer f.Close()
 
-	if err := png.Encode(f, dst); err != nil {
+	w := bufio.NewWriter(f)
+	if err := png.Encode(w, dst); err != nil {
+		return err
+	}
+	if err := w.Flush(); err != nil {
 		return err
 	}
 

examples/blocks/main.go

@@ -15,6 +15,7 @@
 package main
 
 import (
+	"bufio"
 	"flag"
 	"log"
 	"os"
@@ -33,9 +34,11 @@ func main() {
 		if err != nil {
 			log.Fatal(err)
 		}
-		if err := pprof.StartCPUProfile(f); err != nil {
+		w := bufio.NewWriter(f)
+		if err := pprof.StartCPUProfile(w); err != nil {
 			log.Fatal(err)
 		}
+		defer w.Flush()
 		defer pprof.StopCPUProfile()
 	}
 

examples/keyboard/keyboard/gen.go

@@ -17,6 +17,7 @@
 package main
 
 import (
+	"bufio"
 	"bytes"
 	"image"
 	"image/png"
@@ -220,7 +221,11 @@ func outputKeyboardImage() (map[ebiten.Key]image.Rectangle, error) {
 	}
 	defer out.Close()
 
-	if err := png.Encode(out, img); err != nil {
+	w := bufio.NewWriter(out)
+	if err := png.Encode(w, img); err != nil {
+		return nil, err
+	}
+	if err := w.Flush(); err != nil {
 		return nil, err
 	}
 
@@ -278,10 +283,17 @@ func outputKeyRectsGo(k map[ebiten.Key]image.Rectangle) error {
 	if err != nil {
 		return err
 	}
-	return tmpl.Execute(f, map[string]any{
+	w := bufio.NewWriter(f)
+	if err := tmpl.Execute(w, map[string]any{
 		"License":     license,
 		"KeyRectsMap": k,
-	})
+	}); err != nil {
+		return err
+	}
+	if err := w.Flush(); err != nil {
+		return err
+	}
+	return nil
 }
 
 type game struct {

examples/shaderprecomp/fxc/gen.go

@@ -20,6 +20,7 @@
 package main
 
 import (
+	"bufio"
 	"errors"
 	"fmt"
 	"os"
@@ -88,7 +89,15 @@ func generateHSLSFiles(source *shaderprecomp.ShaderSource, index int, tmpdir str
 	}
 	defer psf.Close()
 
-	if err := shaderprecomp.CompileToHLSL(vsf, psf, source); err != nil {
+	vsfw := bufio.NewWriter(vsf)
+	psfw := bufio.NewWriter(psf)
+	if err := shaderprecomp.CompileToHLSL(vsfw, psfw, source); err != nil {
+		return "", "", err
+	}
+	if err := vsfw.Flush(); err != nil {
+		return "", "", err
+	}
+	if err := psfw.Flush(); err != nil {
 		return "", "", err
 	}
 

examples/shaderprecomp/metallib/gen.go

@@ -20,6 +20,7 @@
 package main
 
 import (
+	"bufio"
 	"fmt"
 	"os"
 	"os/exec"
@@ -68,10 +69,11 @@ func compile(source *shaderprecomp.ShaderSource, index int, tmpdir string) error
 	}
 	defer f.Close()
 
-	if err := shaderprecomp.CompileToMSL(f, source); err != nil {
+	w := bufio.NewWriter(f)
+	if err := shaderprecomp.CompileToMSL(w, source); err != nil {
 		return err
 	}
-	if err := f.Sync(); err != nil {
+	if err := w.Flush(); err != nil {
 		return err
 	}
 

genkeys.go

@@ -19,6 +19,7 @@
 package main
 
 import (
+	"bufio"
 	"log"
 	"os"
 	"path/filepath"
@@ -809,7 +810,8 @@ func main() {
 			buildConstraints = "//go:build !android && !ios && !js && !nintendosdk && !playstation5"
 		}
 		// NOTE: According to godoc, maps are automatically sorted by key.
-		if err := tmpl.Execute(f, struct {
+		w := bufio.NewWriter(f)
+		if err := tmpl.Execute(w, struct {
 			License                         string
 			DoNotEdit                       string
 			BuildConstraints                string
@@ -840,5 +842,9 @@ func main() {
 		}); err != nil {
 			log.Fatal(err)
 		}
+
+		if err := w.Flush(); err != nil {
+			log.Fatal(err)
+		}
 	}
 }

internal/gamepaddb/gen.go

@@ -155,7 +155,8 @@ func run() error {
 		}
 		defer f.Close()
 
-		if err := tmpl.Execute(f, struct {
+		w := bufio.NewWriter(f)
+		if err := tmpl.Execute(w, struct {
 			License          string
 			DoNotEdit        string
 			BuildConstraints string
@@ -170,6 +171,9 @@ func run() error {
 		}); err != nil {
 			return err
 		}
+		if err := w.Flush(); err != nil {
+			return err
+		}
 	}
 
 	return nil

internal/png/gen.go

@@ -17,6 +17,7 @@
 package main
 
 import (
+	"bufio"
 	"fmt"
 	"go/ast"
 	"go/format"
@@ -93,6 +94,8 @@ func run() error {
 		}
 		defer out.Close()
 
+		w := bufio.NewWriter(out)
+
 		// TODO: Remove call of RegisterDecoder
 
 		data, err := os.ReadFile(filepath.Join(dir, f))
@@ -129,14 +132,14 @@ func run() error {
 			return true
 		}, nil)
 
-		fmt.Fprintln(out, "// Code generated by gen.go. DO NOT EDIT.")
-		fmt.Fprintln(out)
-		format.Node(out, fset, tree)
+		fmt.Fprintln(w, "// Code generated by gen.go. DO NOT EDIT.")
+		fmt.Fprintln(w)
+		format.Node(w, fset, tree)
 
 		if f == "reader.go" {
 			// The min function was removed as of Go 1.22, but this is needed for old Go.
 			// TODO: Remove this when Go 1.21 is the minimum supported version.
-			fmt.Fprintln(out, `
+			fmt.Fprintln(w, `
 func min(a, b int) int {
 	if a < b {
 		return a
@@ -144,6 +147,10 @@ func min(a, b int) int {
 	return b
 }`)
 		}
+
+		if err := w.Flush(); err != nil {
+			return err
+		}
 	}
 	return nil
 }