Attachment 71 Details for Bug 196 – Patch for ImageUtil

Patch for ImageUtil

ImageUtil.java.diff (text/plain), 2.79 KB, created by Sven Gothel on 2006-01-24 21:57:00 CET

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Creator: Sven Gothel

Created: 2006-01-24 21:57:00 CET

Size: 2.79 KB

patch

obsolete

>--- ImageUtil.java	2006-01-12 23:29:00.000000000 -0800
>+++ D:\ImageUtil.java	2006-01-24 21:49:53.468750000 -0800
>@@ -39,6 +39,7 @@
> 
> package com.sun.opengl.util;
> 
>+import java.awt.*;
> import java.awt.image.*;
> 
> /** Utilities for dealing with images. */
>@@ -61,4 +62,65 @@
>       raster.setDataElements(0, image.getHeight() - i - 1, image.getWidth(), 1, scanline1);
>     }
>   }
>+  
>+  /**
>+   * Creates a <code>BufferedImage</code> with a pixel format compatible with the graphics
>+   * environment. The returned image can thus benefit from hardware accelerated operations
>+   * in Java2D API.
>+   *
>+   * @param width The width of the image to be created
>+   * @param height The height of the image to be created
>+   *
>+   * @return A instance of <code>BufferedImage</code> with a type compatible with the graphics card.
>+   */
>+  public static BufferedImage createCompatibleImage(int width, int height) {
>+    GraphicsConfiguration configuration =
>+       GraphicsEnvironment.getLocalGraphicsEnvironment().
>+         getDefaultScreenDevice().getDefaultConfiguration();
>+    return configuration.createCompatibleImage(width, height);
>+  }
>+
>+  /**
>+   * Creates a thumbnail from an image. A thumbnail is a scaled down version of the original picture.
>+   * This method will retain the width to height ratio of the original picture and return a new
>+   * instance of <code>BufferedImage</code>. The original picture is not modified.
>+   *
>+   * @param image The original image to sample down
>+   * @param thumbWidth The width of the thumbnail to be created
>+   *
>+   * @throws IllegalArgumentException If thumbWidth is greater than image.getWidth()
>+   *
>+   * @return A thumbnail with the requested width or the original picture if thumbWidth = image.getWidth()
>+   */
>+  public static BufferedImage createThumbnail(BufferedImage image, int thumbWidth) {
>+    if (thumbWidth > image.getWidth()) {
>+      throw new IllegalArgumentException("Thumbnail width must be greater than image width");
>+    }
>+    
>+    if (thumbWidth == image.getWidth()) {
>+      return image;
>+    }
>+  
>+    float ratio = (float) image.getWidth() / (float) image.getHeight();
>+    int width = image.getWidth();
>+    BufferedImage thumb = image;
>+    
>+    do {
>+      width /= 2;
>+      if (width < thumbWidth) {
>+        width = thumbWidth;
>+      }
>+      
>+      BufferedImage temp = createCompatibleImage(width, (int) (width / ratio));
>+      Graphics2D g2 = temp.createGraphics();
>+      g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
>+                          RenderingHints.VALUE_INTERPOLATION_BILINEAR);
>+      g2.drawImage(thumb, 0, 0, temp.getWidth(), temp.getHeight(), null);
>+      g2.dispose();
>+
>+      thumb = temp;
>+    } while (width != thumbWidth);
>+    
>+    return thumb;
>+  }
> }

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