1 files changed, 67 insertions, 0 deletions
diff --git a/propertysheet/src/org/eclipse/wb/internal/core/utils/ui/DrawUtils.java b/propertysheet/src/org/eclipse/wb/internal/core/utils/ui/DrawUtils.java
index f7cc09d..c22256e 100644
--- a/propertysheet/src/org/eclipse/wb/internal/core/utils/ui/DrawUtils.java
+++ b/propertysheet/src/org/eclipse/wb/internal/core/utils/ui/DrawUtils.java
@@ -262,6 +262,73 @@ public class DrawUtils {
 
   ////////////////////////////////////////////////////////////////////////////
   //
+  // Rotated images
+  //
+  ////////////////////////////////////////////////////////////////////////////
+  /**
+   * Returns a new Image that is the given Image rotated left by 90 degrees. The client is
+   * responsible for disposing the returned Image. This method MUST be invoked from the
+   * user-interface (Display) thread.
+   *
+   * @param srcImage
+   *          the Image that is to be rotated left
+   * @return the rotated Image (the client is responsible for disposing it)
+   */
+  public static Image createRotatedImage(Image srcImage) {
+    // prepare Display
+    Display display = Display.getCurrent();
+    if (display == null) {
+      SWT.error(SWT.ERROR_THREAD_INVALID_ACCESS);
+    }
+    // rotate ImageData
+    ImageData destData;
+    {
+      ImageData srcData = srcImage.getImageData();
+      if (srcData.depth < 8) {
+        destData = rotatePixelByPixel(srcData);
+      } else {
+        destData = rotateOptimized(srcData);
+      }
+    }
+    // create new image
+    return new Image(display, destData);
+  }
+
+  private static ImageData rotatePixelByPixel(ImageData srcData) {
+    ImageData destData =
+        new ImageData(srcData.height, srcData.width, srcData.depth, srcData.palette);
+    for (int y = 0; y < srcData.height; y++) {
+      for (int x = 0; x < srcData.width; x++) {
+        destData.setPixel(y, srcData.width - x - 1, srcData.getPixel(x, y));
+      }
+    }
+    return destData;
+  }
+
+  private static ImageData rotateOptimized(ImageData srcData) {
+    int bytesPerPixel = Math.max(1, srcData.depth / 8);
+    int destBytesPerLine =
+        ((srcData.height * bytesPerPixel - 1) / srcData.scanlinePad + 1) * srcData.scanlinePad;
+    byte[] newData = new byte[destBytesPerLine * srcData.width];
+    for (int srcY = 0; srcY < srcData.height; srcY++) {
+      for (int srcX = 0; srcX < srcData.width; srcX++) {
+        int destX = srcY;
+        int destY = srcData.width - srcX - 1;
+        int destIndex = destY * destBytesPerLine + destX * bytesPerPixel;
+        int srcIndex = srcY * srcData.bytesPerLine + srcX * bytesPerPixel;
+        System.arraycopy(srcData.data, srcIndex, newData, destIndex, bytesPerPixel);
+      }
+    }
+    return new ImageData(srcData.height,
+        srcData.width,
+        srcData.depth,
+        srcData.palette,
+        srcData.scanlinePad,
+        newData);
+  }
+
+  ////////////////////////////////////////////////////////////////////////////
+  //
   // Colors
   //
   ////////////////////////////////////////////////////////////////////////////