From 303244eeb7fa0616a71f3782414a8697225abb0a Mon Sep 17 00:00:00 2001
From: Niki Roo <niki@nikiroo.be>
Date: Thu, 7 May 2020 19:24:10 +0200
Subject: [PATCH] ImageUtils + awt: change scale parameters

---
 ImageUtils.java       | 39 +++++++++++++-------------
 ui/ImageUtilsAwt.java | 65 +++++++++++++++++++++++++++++++++----------
 2 files changed, 70 insertions(+), 34 deletions(-)

diff --git a/ImageUtils.java b/ImageUtils.java
index 2b8ff8f..877c8fa 100644
--- a/ImageUtils.java
+++ b/ImageUtils.java
@@ -44,40 +44,39 @@ public abstract class ImageUtils {
 	/**
 	 * 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 areaWidth
+	 *            the base width of the target dimension for snap sizes
+	 * @param areaHeight
+	 *            the base height of the target dimension for snap sizes
 	 * @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)
+	 *            the zoom factor (ignored on snap mode)
+	 * @param snapMode
+	 *            NULL for no snap mode, TRUE to snap to width and FALSE for
+	 *            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) {
+	protected static Integer[] scaleSize(int imageWidth, int imageHeight,
+			int areaWidth, int areaHeight, double zoom, Boolean snapMode) {
 		int width;
 		int height;
-		if (zoom > 0) {
+		if (snapMode == null) {
 			width = (int) Math.round(imageWidth * zoom);
 			height = (int) Math.round(imageHeight * zoom);
+		} else if (snapMode) {
+			width = areaWidth;
+			height = (int) Math
+					.round((((double) areaWidth) / imageWidth) * imageHeight);
 		} else {
-			if (zoomSnapWidth) {
-				width = areaWidth;
-				height = (int) Math.round(
-						(((double) areaWidth) / imageWidth) * imageHeight);
-			} else {
-				height = areaHeight;
-				width = (int) Math.round(
-						(((double) areaHeight) / imageHeight) * imageWidth);
+			height = areaHeight;
+			width = (int) Math
+					.round((((double) areaHeight) / imageHeight) * imageWidth);
 
-			}
 		}
 
 		if (width < 1)
diff --git a/ui/ImageUtilsAwt.java b/ui/ImageUtilsAwt.java
index 19c16a0..c273e0d 100644
--- a/ui/ImageUtilsAwt.java
+++ b/ui/ImageUtilsAwt.java
@@ -262,32 +262,69 @@ public class ImageUtilsAwt extends ImageUtils {
 		return image;
 	}
 
+	/**
+	 * Scale a dimension.
+	 * 
+	 * @param imageSize
+	 *            the actual image size
+	 * @param areaSize
+	 *            the base size of the target to get snap sizes for
+	 * @param zoom
+	 *            the zoom factor (ignored on snap mode)
+	 * @param snapMode
+	 *            NULL for no snap mode, TRUE to snap to width and FALSE for
+	 *            snap to height)
+	 * 
+	 * @return the scaled (minimum is 1x1)
+	 */
+	public static Dimension scaleSize(Dimension imageSize, Dimension areaSize,
+			double zoom, Boolean snapMode) {
+		Integer[] sz = scaleSize(imageSize.width, imageSize.height,
+				areaSize.width, areaSize.height, zoom, snapMode);
+		return new Dimension(sz[0], sz[1]);
+	}
+
 	/**
 	 * Resize the given image.
 	 * 
+	 * @param image
+	 *            the image to resize
 	 * @param areaSize
 	 *            the base size of the target dimension for snap sizes
+	 * @param zoom
+	 *            the zoom factor (ignored on snap mode)
+	 * @param snapMode
+	 *            NULL for no snap mode, TRUE to snap to width and FALSE for
+	 *            snap to height)
+	 * 
+	 * @return a new, resized image
+	 */
+	public static BufferedImage scaleImage(BufferedImage image,
+			Dimension areaSize, double zoom, Boolean snapMode) {
+		Dimension scaledSize = scaleSize(
+				new Dimension(image.getWidth(), image.getHeight()), areaSize,
+				zoom, snapMode);
+
+		return scaleImage(image, scaledSize);
+	}
+
+	/**
+	 * Resize the given image.
+	 * 
 	 * @param image
 	 *            the image to resize
-	 * @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)
+	 * @param targetSize
+	 *            the target size
 	 * 
 	 * @return a new, resized image
 	 */
-	public static BufferedImage scaleImage(Dimension areaSize,
-			BufferedImage image, double zoom, boolean zoomSnapWidth) {
-		Integer scaledSize[] = scaleSize(areaSize.width, areaSize.height,
-				image.getWidth(), image.getHeight(), zoom, zoomSnapWidth);
-		int width = scaledSize[0];
-		int height = scaledSize[1];
-		BufferedImage resizedImage = new BufferedImage(width, height,
-				BufferedImage.TYPE_4BYTE_ABGR);
+	public static BufferedImage scaleImage(BufferedImage image,
+			Dimension targetSize) {
+		BufferedImage resizedImage = new BufferedImage(targetSize.width,
+				targetSize.height, BufferedImage.TYPE_4BYTE_ABGR);
 		Graphics2D g = resizedImage.createGraphics();
 		try {
-			g.drawImage(image, 0, 0, width, height, null);
+			g.drawImage(image, 0, 0, targetSize.width, targetSize.height, null);
 		} finally {
 			g.dispose();
 		}
-- 
2.27.0