/* * Copyright (C) 2011 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.camera.panorama; /** * The Java interface to JNI calls regarding mosaic stitching. * * A high-level usage is: * * Mosaic mosaic = new Mosaic(); * mosaic.setSourceImageDimensions(width, height); * mosaic.reset(blendType); * * while ((pixels = hasNextImage()) != null) { * mosaic.setSourceImage(pixels); * } * * mosaic.createMosaic(highRes); * byte[] result = mosaic.getFinalMosaic(); * */ public class Mosaic { /** * In this mode, the images are stitched together in the same spatial arrangement as acquired * i.e. if the user follows a curvy trajectory, the image boundary of the resulting mosaic will * be curved in the same manner. This mode is useful if the user wants to capture a mosaic as * if "painting" the scene using the smart-phone device and does not want any corrective warps * to distort the captured images. */ public static final int BLENDTYPE_FULL = 0; /** * This mode is the same as BLENDTYPE_FULL except that the resulting mosaic is rotated * to balance the first and last images to be approximately at the same vertical offset in the * output mosaic. This is useful when acquiring a mosaic by a typical panning-like motion to * remove a one-sided curve in the mosaic (typically due to the camera not staying horizontal * during the video capture) and convert it to a more symmetrical "smiley-face" like output. */ public static final int BLENDTYPE_PAN = 1; /** * This mode compensates for typical "smiley-face" like output in longer mosaics and creates * a rectangular mosaic with minimal black borders (by unwrapping the mosaic onto an imaginary * cylinder). If the user follows a curved trajectory (instead of a perfect panning trajectory), * the resulting mosaic here may suffer from some image distortions in trying to map the * trajectory to a cylinder. */ public static final int BLENDTYPE_CYLINDERPAN = 2; /** * This mode is basically BLENDTYPE_CYLINDERPAN plus doing a rectangle cropping before returning * the mosaic. The mode is useful for making the resulting mosaic have a rectangle shape. */ public static final int BLENDTYPE_HORIZONTAL =3; /** * This strip type will use the default thin strips where the strips are * spaced according to the image capture rate. */ public static final int STRIPTYPE_THIN = 0; /** * This strip type will use wider strips for blending. The strip separation * is controlled by a threshold on the native side. Since the strips are * wider, there is an additional cross-fade blending step to make the seam * boundaries smoother. Since this mode uses lesser image frames, it is * computationally more efficient than the thin strip mode. */ public static final int STRIPTYPE_WIDE = 1; /** * Return flags returned by createMosaic() are one of the following. */ public static final int MOSAIC_RET_OK = 1; public static final int MOSAIC_RET_ERROR = -1; public static final int MOSAIC_RET_CANCELLED = -2; public static final int MOSAIC_RET_LOW_TEXTURE = -3; public static final int MOSAIC_RET_FEW_INLIERS = 2; static { System.loadLibrary("jni_legacymosaic"); } /** * Allocate memory for the image frames at the given resolution. * * @param width width of the input frames in pixels * @param height height of the input frames in pixels */ public native void allocateMosaicMemory(int width, int height); /** * Free memory allocated by allocateMosaicMemory. * */ public native void freeMosaicMemory(); /** * Pass the input image frame to the native layer. Each time the a new * source image t is set, the transformation matrix from the first source * image to t is computed and returned. * * @param pixels source image of NV21 format. * @return Float array of length 11; first 9 entries correspond to the 3x3 * transformation matrix between the first frame and the passed frame; * the 10th entry is the number of the passed frame, where the counting * starts from 1; and the 11th entry is the returning code, whose value * is one of those MOSAIC_RET_* returning flags defined above. */ public native float[] setSourceImage(byte[] pixels); /** * This is an alternative to the setSourceImage function above. This should * be called when the image data is already on the native side in a fixed * byte array. In implementation, this array is filled by the GL thread * using glReadPixels directly from GPU memory (where it is accessed by * an associated SurfaceTexture). * * @return Float array of length 11; first 9 entries correspond to the 3x3 * transformation matrix between the first frame and the passed frame; * the 10th entry is the number of the passed frame, where the counting * starts from 1; and the 11th entry is the returning code, whose value * is one of those MOSAIC_RET_* returning flags defined above. */ public native float[] setSourceImageFromGPU(); /** * Set the type of blending. * * @param type the blending type defined in the class. {BLENDTYPE_FULL, * BLENDTYPE_PAN, BLENDTYPE_CYLINDERPAN, BLENDTYPE_HORIZONTAL} */ public native void setBlendingType(int type); /** * Set the type of strips to use for blending. * @param type the blending strip type to use {STRIPTYPE_THIN, * STRIPTYPE_WIDE}. */ public native void setStripType(int type); /** * Tell the native layer to create the final mosaic after all the input frame * data have been collected. * The case of generating high-resolution mosaic may take dozens of seconds to finish. * * @param value True means generating a high-resolution mosaic - * which is based on the original images set in setSourceImage(). * False means generating a low-resolution version - * which is based on 1/4 downscaled images from the original images. * @return Returns a status code suggesting if the mosaic building was * successful, in error, or was cancelled by the user. */ public native int createMosaic(boolean value); /** * Get the data for the created mosaic. * * @return Returns an integer array which contains the final mosaic in the ARGB_8888 format. * The first MosaicWidth*MosaicHeight values contain the image data, followed by 2 * integers corresponding to the values MosaicWidth and MosaicHeight respectively. */ public native int[] getFinalMosaic(); /** * Get the data for the created mosaic. * * @return Returns a byte array which contains the final mosaic in the NV21 format. * The first MosaicWidth*MosaicHeight*1.5 values contain the image data, followed by * 8 bytes which pack the MosaicWidth and MosaicHeight integers into 4 bytes each * respectively. */ public native byte[] getFinalMosaicNV21(); /** * Reset the state of the frame arrays which maintain the captured frame data. * Also re-initializes the native mosaic object to make it ready for capturing a new mosaic. */ public native void reset(); /** * Get the progress status of the mosaic computation process. * @param hires Boolean flag to select whether to report progress of the * low-res or high-res mosaicer. * @param cancelComputation Boolean flag to allow cancelling the * mosaic computation when needed from the GUI end. * @return Returns a number from 0-100 where 50 denotes that the mosaic * computation is 50% done. */ public native int reportProgress(boolean hires, boolean cancelComputation); }