| /* |
| * Copyright 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 androidx.media.filterfw; |
| |
| import java.nio.ByteBuffer; |
| |
| /** |
| * A collection of utilities to deal with pixel operations on ByteBuffers. |
| */ |
| public class PixelUtils { |
| |
| /** |
| * Copy pixels from one buffer to another, applying a transformation. |
| * |
| * <p>The transformation is specified by specifying the initial offset in the output buffer, the |
| * stride (in pixels) between each pixel, and the stride (in pixels) between each row. The row |
| * stride is measured as the number of pixels between the start of each row.</p> |
| * |
| * <p>Note that this method is native for efficiency reasons. It does NOT do any bounds checking |
| * other than making sure the buffers are of sufficient size. This means that you can corrupt |
| * memory if specifying incorrect stride values!</p> |
| * |
| * @param input The input buffer containing pixel data. |
| * @param output The output buffer to hold the transformed pixel data. |
| * @param width The width of the input image. |
| * @param height The height of the input image. |
| * @param offset The start offset in the output (in pixels) |
| * @param pixStride The stride between each pixel (in pixels) |
| * @param rowStride The stride between the start of each row (in pixels) |
| */ |
| public static void copyPixels(ByteBuffer input, |
| ByteBuffer output, |
| int width, |
| int height, |
| int offset, |
| int pixStride, |
| int rowStride) { |
| if (input.remaining() != output.remaining()) { |
| throw new IllegalArgumentException("Input and output buffers must have the same size!"); |
| } else if (input.remaining() % 4 != 0) { |
| throw new IllegalArgumentException("Input buffer size must be a multiple of 4!"); |
| } else if (output.remaining() % 4 != 0) { |
| throw new IllegalArgumentException("Output buffer size must be a multiple of 4!"); |
| } else if ((width * height * 4) != input.remaining()) { |
| throw new IllegalArgumentException( |
| "Input buffer size does not match given dimensions!"); |
| } else if ((width * height * 4) != output.remaining()) { |
| throw new IllegalArgumentException( |
| "Output buffer size does not match given dimensions!"); |
| } |
| nativeCopyPixels(input, output, width, height, offset, pixStride, rowStride); |
| } |
| |
| private static native void nativeCopyPixels(ByteBuffer input, |
| ByteBuffer output, |
| int width, |
| int height, |
| int offset, |
| int pixStride, |
| int rowStride); |
| |
| static { |
| System.loadLibrary("smartcamera_jni"); |
| } |
| |
| } |