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Diffstat (limited to 'src/com/android/camera/Mosaic.java')
| -rw-r--r-- | src/com/android/camera/Mosaic.java | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/src/com/android/camera/Mosaic.java b/src/com/android/camera/Mosaic.java new file mode 100644 index 000000000..b1d10c05b --- /dev/null +++ b/src/com/android/camera/Mosaic.java @@ -0,0 +1,206 @@ +/* + * 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.camera; + +/** + * 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_mosaic"); + } + + /** + * 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); +} |