1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <jni.h>
18#include <math.h>
19#include <android/bitmap.h>
20
21#include "jpegutil.h"
22
23using namespace jpegutil;
24
25/**
26 * Compresses a YCbCr image to jpeg, applying a crop and rotation.
27 *
28 * The input is defined as a set of 3 planes of 8-bit samples, one plane for
29   each channel of Y, Cb, Cr.
30 * The Y plane is assumed to have the same width and height of the entire image.
31 * The Cb and Cr planes are assumed to be downsampled by a factor of 2, to have
32 * dimensions (floor(width / 2), floor(height / 2)).
33 * Each plane is specified by a direct java.nio.ByteBuffer, a pixel-stride, and
34 * a row-stride.  So, the sample at coordinate (x, y) can be retrieved from
35 * byteBuffer[x * pixel_stride + y * row_stride].
36 *
37 * The pre-compression transformation is applied as follows:
38 *  1. The image is cropped to the rectangle from (cropLeft, cropTop) to
39 *  (cropRight - 1, cropBottom - 1).  So, a cropping-rectangle of (0, 0) -
40 *  (width, height) is a no-op.
41 *  2. The rotation is applied counter-clockwise relative to the coordinate
42 *  space of the image, so a CCW rotation will appear CW when the image is
43 *  rendered in scanline order.  Only rotations which are multiples of
44 *  90-degrees are suppored, so the parameter 'rot90' specifies which multiple
45 *  of 90 to rotate the image.
46 *
47 * @param env the JNI environment
48 * @param width the width of the image to compress
49 * @param height the height of the image to compress
50 * @param yBuf the buffer containing the Y component of the image
51 * @param yPStride the stride between adjacent pixels in the same row in yBuf
52 * @param yRStride the stride between adjacent rows in yBuf
53 * @param cbBuf the buffer containing the Cb component of the image
54 * @param cbPStride the stride between adjacent pixels in the same row in cbBuf
55 * @param cbRStride the stride between adjacent rows in cbBuf
56 * @param crBuf the buffer containing the Cr component of the image
57 * @param crPStride the stride between adjacent pixels in the same row in crBuf
58 * @param crRStride the stride between adjacent rows in crBuf
59 * @param outBuf a direct java.nio.ByteBuffer to hold the compressed jpeg.  This
60 * must have enough capacity to store the result, or an error code will be
61 * returned.
62 * @param outBufCapacity the capacity of outBuf
63 * @param quality the jpeg-quality (1-100) to use
64 * @param crop[Left|Top|Right|Bottom] the bounds of the image to crop to before
65 * rotation
66 * @param rot90 the multiple of 90 to rotate by
67 */
68extern "C" JNIEXPORT jint JNICALL
69Java_com_android_camera_util_JpegUtilNative_compressJpegFromYUV420pNative(
70    JNIEnv* env, jclass clazz,
71    /** Input image dimensions */
72    jint width, jint height,
73    /** Y Plane */
74    jobject yBuf, jint yPStride, jint yRStride,
75    /** Cb Plane */
76    jobject cbBuf, jint cbPStride, jint cbRStride,
77    /** Cr Plane */
78    jobject crBuf, jint crPStride, jint crRStride,
79    /** Output */
80    jobject outBuf, jint outBufCapacity,
81    /** Jpeg compression parameters */
82    jint quality,
83    /** Crop */
84    jint cropLeft, jint cropTop, jint cropRight, jint cropBottom,
85    /** Rotation (multiple of 90).  For example, rot90 = 1 implies a 90 degree
86     * rotation. */
87    jint rot90) {
88  jbyte* y = (jbyte*)env->GetDirectBufferAddress(yBuf);
89  jbyte* cb = (jbyte*)env->GetDirectBufferAddress(cbBuf);
90  jbyte* cr = (jbyte*)env->GetDirectBufferAddress(crBuf);
91  jbyte* out = (jbyte*)env->GetDirectBufferAddress(outBuf);
92
93  return Compress(width, height,                                //
94                  (unsigned char*)y, yPStride, yRStride,        //
95                  (unsigned char*)cb, cbPStride, cbRStride,     //
96                  (unsigned char*)cr, crPStride, crRStride,     //
97                  (unsigned char*)out, (size_t)outBufCapacity,  //
98                  quality,                                      //
99                  cropLeft, cropTop, cropRight, cropBottom,     //
100                  rot90);
101}
102
103/**
104 * Copies the Image.Plane specified by planeBuf, pStride, and rStride to the
105 * Bitmap.
106 *
107 * @param env the JNI environment
108 * @param clazz the java class
109 * @param width the width of the output image
110 * @param height the height of the output image
111 * @param planeBuf the native ByteBuffer containing the image plane data
112 * @param pStride the stride between adjacent pixels in the same row of
113 *planeBuf
114 * @param rStride the stride between adjacent rows in planeBuf
115 * @param rot90 the multiple of 90 degrees to rotate, one of {0, 1, 2, 3}.
116 */
117extern "C" JNIEXPORT void JNICALL
118Java_com_android_camera_util_JpegUtilNative_copyImagePlaneToBitmap(
119    JNIEnv* env, jclass clazz, jint width, jint height, jobject planeBuf,
120    jint pStride, jint rStride, jobject outBitmap, jint rot90) {
121  jbyte* src = (jbyte*)env->GetDirectBufferAddress(planeBuf);
122
123  char* dst = 0;
124  AndroidBitmap_lockPixels(env, outBitmap, (void**)&dst);
125
126  if (rot90 == 0) {
127    // No rotation
128    for (int y = 0; y < height; y++) {
129      char* srcPtr = reinterpret_cast<char*>(&src[y * rStride]);
130      char* dstPtr = &dst[y * width];
131      for (int x = 0; x < width; x++) {
132        *dstPtr = *srcPtr;
133        srcPtr += pStride;
134        dstPtr++;
135      }
136    }
137  } else if (rot90 == 1) {
138    // 90-degree rotation
139    for (int y = 0; y < height; y++) {
140      for (int x = 0; x < width; x++) {
141        int srcX = height - 1 - y;
142        int srcY = x;
143        dst[y * width + x] = src[srcX * pStride + rStride * srcY];
144      }
145    }
146  } else if (rot90 == 2) {
147    // 180-degree rotation
148    for (int y = 0; y < height; y++) {
149      for (int x = 0; x < width; x++) {
150        int srcX = width - 1 - x;
151        int srcY = height - 1 - y;
152        dst[y * width + x] = src[srcX * pStride + rStride * srcY];
153      }
154    }
155  } else if (rot90 == 3) {
156    // 270-degree rotation
157    for (int y = 0; y < height; y++) {
158      for (int x = 0; x < width; x++) {
159        int srcX = y;
160        int srcY = width - 1 - x;
161        dst[y * width + x] = src[srcX * pStride + rStride * srcY];
162      }
163    }
164  }
165
166  AndroidBitmap_unlockPixels(env, outBitmap);
167}
168