1 files changed, 120 insertions, 0 deletions
diff --git a/media/java/android/media/ImageUtils.java b/media/java/android/media/ImageUtils.java
new file mode 100644
index 0000000..89313bf
--- /dev/null
+++ b/media/java/android/media/ImageUtils.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright 2015 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 android.media;
+
+import android.graphics.ImageFormat;
+import android.graphics.PixelFormat;
+import android.media.Image.Plane;
+import android.util.Size;
+
+import java.nio.ByteBuffer;
+
+/**
+ * Package private utility class for hosting commonly used Image related methods.
+ */
+class ImageUtils {
+
+    /**
+     * Only a subset of the formats defined in
+     * {@link android.graphics.ImageFormat ImageFormat} and
+     * {@link android.graphics.PixelFormat PixelFormat} are supported by
+     * ImageReader. When reading RGB data from a surface, the formats defined in
+     * {@link android.graphics.PixelFormat PixelFormat} can be used; when
+     * reading YUV, JPEG or raw sensor data (for example, from the camera or video
+     * decoder), formats from {@link android.graphics.ImageFormat ImageFormat}
+     * are used.
+     */
+    public static int getNumPlanesForFormat(int format) {
+        switch (format) {
+            case ImageFormat.YV12:
+            case ImageFormat.YUV_420_888:
+            case ImageFormat.NV21:
+                return 3;
+            case ImageFormat.NV16:
+                return 2;
+            case PixelFormat.RGB_565:
+            case PixelFormat.RGBA_8888:
+            case PixelFormat.RGBX_8888:
+            case PixelFormat.RGB_888:
+            case ImageFormat.JPEG:
+            case ImageFormat.YUY2:
+            case ImageFormat.Y8:
+            case ImageFormat.Y16:
+            case ImageFormat.RAW_SENSOR:
+            case ImageFormat.RAW10:
+                return 1;
+            case PixelFormat.OPAQUE:
+                return 0;
+            default:
+                throw new UnsupportedOperationException(
+                        String.format("Invalid format specified %d", format));
+        }
+    }
+
+    /**
+     * <p>
+     * Copy source image data to destination Image.
+     * </p>
+     * <p>
+     * Only support the copy between two non-opaque images with same properties
+     * (format, size, etc.). The data from the source image will be copied to
+     * the byteBuffers from the destination Image starting from position zero,
+     * and the destination image will be rewound to zero after copy is done.
+     * </p>
+     *
+     * @param src The source image to be copied from.
+     * @param dst The destination image to be copied to.
+     * @throws IllegalArgumentException If the source and destination images
+     *             have different format, or one of the images is not copyable.
+     */
+    public static void imageCopy(Image src, Image dst) {
+        if (src == null || dst == null) {
+            throw new IllegalArgumentException("Images should be non-null");
+        }
+        if (src.getFormat() != dst.getFormat()) {
+            throw new IllegalArgumentException("Src and dst images should have the same format");
+        }
+        if (src.isOpaque() || dst.isOpaque()) {
+            throw new IllegalArgumentException("Opaque image is not copyable");
+        }
+        if (!(dst.getOwner() instanceof ImageWriter)) {
+            throw new IllegalArgumentException("Destination image is not from ImageWriter. Only"
+                    + " the images from ImageWriter are writable");
+        }
+        Size srcSize = new Size(src.getWidth(), src.getHeight());
+        Size dstSize = new Size(dst.getWidth(), dst.getHeight());
+        if (!srcSize.equals(dstSize)) {
+            throw new IllegalArgumentException("source image size " + srcSize + " is different"
+                    + " with " + "destination image size " + dstSize);
+        }
+
+        Plane[] srcPlanes = src.getPlanes();
+        Plane[] dstPlanes = dst.getPlanes();
+        ByteBuffer srcBuffer = null;
+        ByteBuffer dstBuffer = null;
+        for (int i = 0; i < srcPlanes.length; i++) {
+            srcBuffer = srcPlanes[i].getBuffer();
+            int srcPos = srcBuffer.position();
+            srcBuffer.rewind();
+            dstBuffer = dstPlanes[i].getBuffer();
+            dstBuffer.rewind();
+            dstBuffer.put(srcBuffer);
+            srcBuffer.position(srcPos);
+            dstBuffer.rewind();
+        }
+    }
+}