[gwt-contrib] Set better Graphics2D rendering quality, fixes 7193 (issue1663803)

[stephen . haberman]

Reviewers: cromwellian,


Please review this at http://gwt-code-reviews.appspot.com/1663803/

Affected files:
  M user/src/com/google/gwt/resources/rg/ImageBundleBuilder.java


Index: user/src/com/google/gwt/resources/rg/ImageBundleBuilder.java
diff --git a/user/src/com/google/gwt/resources/rg/ImageBundleBuilder.java  
b/user/src/com/google/gwt/resources/rg/ImageBundleBuilder.java
index  
429acfa7ed20a7ed9e98490794bb7c29ba31929e..576951d7a4be62ea2efe3515611191443a821cbe  
100644
--- a/user/src/com/google/gwt/resources/rg/ImageBundleBuilder.java
+++ b/user/src/com/google/gwt/resources/rg/ImageBundleBuilder.java
@@ -24,6 +24,7 @@ import  
com.google.gwt.dev.util.log.speedtracer.SpeedTracerLogger;
 import org.w3c.dom.Node;

 import java.awt.Graphics2D;
+import java.awt.RenderingHints;
 import java.awt.geom.AffineTransform;
 import java.awt.image.BufferedImage;
 import java.io.ByteArrayOutputStream;
@@ -538,6 +539,8 @@ class ImageBundleBuilder {
     Graphics2D g2d = bundledImage.createGraphics();
     createGraphicsEvent.end();

+    setBetterRenderingQuality(g2d);
+
     g2d.drawImage(rect.getImage(), rect.transform(), null);
     g2d.dispose();

@@ -593,6 +596,13 @@ class ImageBundleBuilder {
     return b / gcd(a, b) * a;
   }

+  private static void setBetterRenderingQuality(Graphics2D g2d) {
+    g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
+        RenderingHints.VALUE_INTERPOLATION_BILINEAR);
+    g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION,
+        RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
+  }
+
   private final Map<String, ImageRect> imageNameToImageRectMap = new  
HashMap<String, ImageRect>();

   public ImageBundleBuilder() {
@@ -818,6 +828,9 @@ class ImageBundleBuilder {
     SpeedTracerLogger.Event graphicsEvent =  
SpeedTracerLogger.start(CompilerEventType.GRAPHICS_INIT,
         "java.awt.headless", System.getProperty("java.awt.headless"));
     Graphics2D g2d = bundledImage.createGraphics();
+
+    setBetterRenderingQuality(g2d);
+
     graphicsEvent.end();

     for (ImageRect imageRect : imageRects) {


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