<!DOCTYPE html> <meta charset="utf-8"> <meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/highdpi.png"> <meta name="description" content="Ebiten example - highdpi"> <link rel="shortcut icon" href="../favicon.png" type="image/png" > <link rel="icon" href="../favicon.png" type="image/png" > <title>Ebiten example - highdpi</title> <link rel="stylesheet" href="../stylesheets/bootstrap.min.css"> <link rel="stylesheet" href="../stylesheets/highlight-github.css"> <link rel="stylesheet" href="../stylesheets/ebiten.css"> <script src="../scripts/googleanalytics.js"></script> <nav class="navbar"><div class="container"> <nav class="d-flex flex-row" style="width: 100%;"> <div class="nav mr-auto"><a class="navbar-brand" href="../"><img src="../images/logo_white.svg" alt="EBITEN"></a></div> <ul class="nav"> <li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten">GitHub</a></li> <li class="nav-item"><a class="nav-link" href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li> <li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a> <li class="nav-item"><a class="nav-link" href="https://ebiten-playground.github.io/">Playground</a> </ul> </nav> </div></nav> <main><div class="container"> <h2>Ebiten example - highdpi</h2> <iframe src="highdpi.content.html" width="640" height="480"></iframe> <div class="card"><pre class="card-body"><code class="language-go">// +build example package main import ( "fmt" "image" _ "image/jpeg" "log" "net/http" "github.com/hajimehoshi/ebiten" "github.com/hajimehoshi/ebiten/ebitenutil" ) var ( count int highDPIImage *ebiten.Image highDPIImageCh = make(chan *ebiten.Image) ) func init() { // Licensed under Public Domain // https://commons.wikimedia.org/wiki/File:As08-16-2593.jpg const url = "https://upload.wikimedia.org/wikipedia/commons/1/1f/As08-16-2593.jpg" // Load the image asynchronously. go func() { res, err := http.Get(url) if err != nil { log.Fatal(err) } defer res.Body.Close() img, _, err := image.Decode(res.Body) if err != nil { log.Fatal(err) } eimg, err := ebiten.NewImageFromImage(img, ebiten.FilterDefault) if err != nil { log.Fatal(err) } highDPIImageCh <- eimg close(highDPIImageCh) }() } func update(screen *ebiten.Image) error { if highDPIImage == nil { // Use select and 'default' clause for non-blocking receiving. select { case img := <-highDPIImageCh: highDPIImage = img default: } } if ebiten.IsRunningSlowly() { return nil } if highDPIImage == nil { ebitenutil.DebugPrint(screen, "Loading the image...") return nil } scale := ebiten.DeviceScaleFactor() sw, sh := screen.Size() w, h := highDPIImage.Size() op := &ebiten.DrawImageOptions{} // Move the images's center to the upper left corner. op.GeoM.Translate(float64(-w)/2, float64(-h)/2) // The image is just too big. Adjust the scale. op.GeoM.Scale(0.25, 0.25) // Scale the image by the device ratio so that the rendering result can be same // on various (diffrent-DPI) environments. op.GeoM.Scale(scale, scale) // Move the image's center to the screen's center. op.GeoM.Translate(float64(sw)/2, float64(sh)/2) op.Filter = ebiten.FilterLinear screen.DrawImage(highDPIImage, op) ebitenutil.DebugPrint(screen, fmt.Sprintf("Device Scale Ratio: %0.2f", scale)) return nil } func main() { const ( screenWidth = 640 screenHeight = 480 ) // Pass the invert of scale so that Ebiten's auto scaling by device scale is disabled. s := ebiten.DeviceScaleFactor() if err := ebiten.Run(update, int(screenWidth*s), int(screenHeight*s), 1/s, "High DPI (Ebiten Demo)"); err != nil { log.Fatal(err) } } </code></pre></div> </div></main> <footer><div class="container"> <p>© 2013 Hajime Hoshi</p> <p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">the Apache License 2.0</a>.</p> <p>The content of this page is licensed under <a href="https://creativecommons.org/licenses/by/4.0/">the Creative Commons Attribution 4.0 License</a>.</p> </div></footer> <script src="../scripts/highlight.pack.js"></script> <script>hljs.initHighlightingOnLoad();</script>