1 files changed, 169 insertions, 0 deletions
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/draw9patch/graphics/GraphicsUtilities.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/draw9patch/graphics/GraphicsUtilities.java
new file mode 100644
index 000000000..74c2f043e
--- /dev/null
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/draw9patch/graphics/GraphicsUtilities.java
@@ -0,0 +1,169 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.ide.eclipse.adt.internal.editors.draw9patch.graphics;
+
+import org.eclipse.swt.graphics.ImageData;
+
+/**
+ * The utility class for SWT Image and ImageData manipulation.
+ */
+public class GraphicsUtilities {
+
+    /**
+     * Convert normal image to 9-patched.
+     * @return Returns 9-patched ImageData object. If image is null, returns null.
+     */
+    public static ImageData convertToNinePatch(ImageData image) {
+        if (image == null) {
+            return null;
+        }
+        ImageData result = new ImageData(image.width + 2, image.height + 2, image.depth,
+                image.palette);
+
+        final int[] colors = new int[image.width];
+        final byte[] alpha = new byte[image.width];
+
+        for (int y = 0; y < image.height; y++) {
+
+            // Copy pixels
+            image.getPixels(0, y, image.width, colors, 0);
+            result.setPixels(1, y + 1, image.width, colors, 0);
+
+            // Copy alpha
+            image.getAlphas(0, y, image.width, alpha, 0);
+            result.setAlphas(1, y + 1, image.width, alpha, 0);
+        }
+
+        return result;
+    }
+
+    /**
+     * Wipe all color and alpha pixels.
+     */
+    public static void clearImageData(ImageData imageData) {
+        if (imageData == null) {
+            throw new IllegalArgumentException("image data must not be null");
+        }
+        int width = imageData.width;
+        int height = imageData.height;
+        for (int y = 0; y < height; y++) {
+            for (int x = 0; x < width; x++) {
+                imageData.setPixel(x, y, 0x00000000);
+                imageData.setAlpha(x, y, 0x00);
+            }
+        }
+    }
+
+    /**
+     * Duplicate the image data.
+     * @return If image is null, return null.
+     */
+    public static ImageData copy(ImageData image) {
+        if (image == null) {
+            return null;
+        }
+        ImageData result = new ImageData(image.width, image.height, image.depth,
+                image.palette);
+
+        final int[] colors = new int[image.width];
+        final byte[] alpha = new byte[image.width];
+
+        for (int y = 0; y < image.height; y++) {
+
+            // Copy pixels
+            image.getPixels(0, y, image.width, colors, 0);
+            result.setPixels(0, y, image.width, colors, 0);
+
+            // Copy alpha
+            image.getAlphas(0, y, image.width, alpha, 0);
+            result.setAlphas(0, y, image.width, alpha, 0);
+        }
+
+        return result;
+    }
+
+    /**
+     * Get column pixels.
+     * @return length of obtained pixels.
+     */
+    public static int getVerticalPixels(ImageData data, int x, int y, int height, int[] out) {
+        if (data == null) {
+            throw new IllegalArgumentException("data must not be null");
+        }
+        if (out == null) {
+            throw new IllegalArgumentException("out array must not be null");
+        }
+        if (height > out.length) {
+            throw new IllegalArgumentException("out array length must be > height");
+        }
+        if (data.height < (y + height)) {
+            throw new IllegalArgumentException("image height must be > (y + height)");
+        }
+        if (x < 0 || y < 0) {
+            throw new IllegalArgumentException("argument x, y must be >= 0");
+        }
+        if (x >= data.width) {
+            throw new IllegalArgumentException("argument x must be < data.width");
+        }
+        if (y >= data.height) {
+            throw new IllegalArgumentException("argument y must be < data.height");
+        }
+        if (height <= 0) {
+            throw new IllegalArgumentException("argument height must be > 0");
+        }
+
+        int idx = 0;
+        while (idx < height) {
+            data.getPixels(x, (y + idx), 1, out, idx);
+            idx++;
+        }
+        return idx;
+    }
+
+    /**
+     * Get row pixels.
+     */
+    public static void getHorizontalPixels(ImageData data, int x, int y, int width, int[] out) {
+        if (data == null) {
+            throw new IllegalArgumentException("data must not be null");
+        }
+        if (out == null) {
+            throw new IllegalArgumentException("out array must not be null");
+        }
+        if (width > out.length) {
+            throw new IllegalArgumentException("out array length must be > width");
+        }
+        if (data.width < (x + width)) {
+            throw new IllegalArgumentException("image height must be > (x + width)");
+        }
+        if (x < 0 || y < 0) {
+            throw new IllegalArgumentException("argument x, y must be >= 0");
+        }
+        if (x >= data.width) {
+            throw new IllegalArgumentException("argument x must be < data.width");
+        }
+        if (y >= data.height) {
+            throw new IllegalArgumentException("argument y must be < data.height");
+        }
+        if (width <= 0) {
+            throw new IllegalArgumentException("argument width must be > 0");
+        }
+
+        data.getPixels(x, y, width, out, 0);
+    }
+
+}