X-Git-Url: http://git.nikiroo.be/?a=blobdiff_plain;f=src%2Fbe%2Fnikiroo%2Futils%2FImageUtils.java;h=2b8ff8fa9ec722056904d310343761f979285924;hb=26a1f3fe044c616802367e8a0f2cd4f099413ceb;hp=cacff8d5bb3717696f633d2befaef893dbfbca4b;hpb=e8aa5bf9227a0d6a6d0bb6a8bc0cc04d0f4d601a;p=nikiroo-utils.git

diff --git a/src/be/nikiroo/utils/ImageUtils.java b/src/be/nikiroo/utils/ImageUtils.java
index cacff8d..2b8ff8f 100644
--- a/src/be/nikiroo/utils/ImageUtils.java
+++ b/src/be/nikiroo/utils/ImageUtils.java
@@ -41,6 +41,53 @@ public abstract class ImageUtils {
 	public abstract void saveAsImage(Image img, File target, String format)
 			throws IOException;
 
+	/**
+	 * Scale a dimension.
+	 * 
+	 * @param areaWidth
+	 *            the base width of the target dimension for snap sizes
+	 * @param areaHeight
+	 *            the base height of the target dimension for snap sizes
+	 * @param imageWidth
+	 *            the actual image width
+	 * @param imageHeight
+	 *            the actual image height
+	 * @param zoom
+	 *            the zoom factor, or -1 for snap size
+	 * @param zoomSnapWidth
+	 *            if snap size, TRUE to snap to width (and FALSE, snap to
+	 *            height)
+	 * 
+	 * @return the scaled size, width is [0] and height is [1] (minimum is 1x1)
+	 */
+	protected static Integer[] scaleSize(int areaWidth, int areaHeight,
+			int imageWidth, int imageHeight, double zoom, boolean zoomSnapWidth) {
+		int width;
+		int height;
+		if (zoom > 0) {
+			width = (int) Math.round(imageWidth * zoom);
+			height = (int) Math.round(imageHeight * zoom);
+		} else {
+			if (zoomSnapWidth) {
+				width = areaWidth;
+				height = (int) Math.round(
+						(((double) areaWidth) / imageWidth) * imageHeight);
+			} else {
+				height = areaHeight;
+				width = (int) Math.round(
+						(((double) areaHeight) / imageHeight) * imageWidth);
+
+			}
+		}
+
+		if (width < 1)
+			width = 1;
+		if (height < 1)
+			height = 1;
+
+		return new Integer[] { width, height };
+	}
+	
 	/**
 	 * Return the EXIF transformation flag of this image if any.
 	 * 
@@ -190,6 +237,14 @@ public abstract class ImageUtils {
 		return set_flag;
 	}
 
+	/**
+	 * Check that the class can operate (for instance, that all the required
+	 * libraries or frameworks are present).
+	 * 
+	 * @return TRUE if it works
+	 */
+	abstract protected boolean check();
+
 	/**
 	 * Create a new {@link ImageUtils}.
 	 * 
@@ -199,8 +254,11 @@ public abstract class ImageUtils {
 		for (String clazz : new String[] { "be.nikiroo.utils.ui.ImageUtilsAwt",
 				"be.nikiroo.utils.android.ImageUtilsAndroid" }) {
 			try {
-				return (ImageUtils) SerialUtils.createObject(clazz);
-			} catch (Exception e) {
+				ImageUtils obj = (ImageUtils) SerialUtils.createObject(clazz);
+				if (obj.check()) {
+					return obj;
+				}
+			} catch (Throwable e) {
 			}
 		}