/*
* Copyright (C) 2014 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.
*/
#include <jni.h>
#include <math.h>
#include <android/bitmap.h>
#include "jpegutil.h"
using namespace jpegutil;
/**
* Compresses a YCbCr image to jpeg, applying a crop and rotation.
*
* The input is defined as a set of 3 planes of 8-bit samples, one plane for
each channel of Y, Cb, Cr.
* The Y plane is assumed to have the same width and height of the entire image.
* The Cb and Cr planes are assumed to be downsampled by a factor of 2, to have
* dimensions (floor(width / 2), floor(height / 2)).
* Each plane is specified by a direct java.nio.ByteBuffer, a pixel-stride, and
* a row-stride. So, the sample at coordinate (x, y) can be retrieved from
* byteBuffer[x * pixel_stride + y * row_stride].
*
* The pre-compression transformation is applied as follows:
* 1. The image is cropped to the rectangle from (cropLeft, cropTop) to
* (cropRight - 1, cropBottom - 1). So, a cropping-rectangle of (0, 0) -
* (width, height) is a no-op.
* 2. The rotation is applied counter-clockwise relative to the coordinate
* space of the image, so a CCW rotation will appear CW when the image is
* rendered in scanline order. Only rotations which are multiples of
* 90-degrees are suppored, so the parameter 'rot90' specifies which multiple
* of 90 to rotate the image.
*
* @param env the JNI environment
* @param width the width of the image to compress
* @param height the height of the image to compress
* @param yBuf the buffer containing the Y component of the image
* @param yPStride the stride between adjacent pixels in the same row in yBuf
* @param yRStride the stride between adjacent rows in yBuf
* @param cbBuf the buffer containing the Cb component of the image
* @param cbPStride the stride between adjacent pixels in the same row in cbBuf
* @param cbRStride the stride between adjacent rows in cbBuf
* @param crBuf the buffer containing the Cr component of the image
* @param crPStride the stride between adjacent pixels in the same row in crBuf
* @param crRStride the stride between adjacent rows in crBuf
* @param outBuf a direct java.nio.ByteBuffer to hold the compressed jpeg. This
* must have enough capacity to store the result, or an error code will be
* returned.
* @param outBufCapacity the capacity of outBuf
* @param quality the jpeg-quality (1-100) to use
* @param crop[Left|Top|Right|Bottom] the bounds of the image to crop to before
* rotation
* @param rot90 the multiple of 90 to rotate by
*/
extern "C" JNIEXPORT jint JNICALL
Java_com_android_camera_util_JpegUtilNative_compressJpegFromYUV420pNative(
JNIEnv* env, jclass clazz,
/** Input image dimensions */
jint width, jint height,
/** Y Plane */
jobject yBuf, jint yPStride, jint yRStride,
/** Cb Plane */
jobject cbBuf, jint cbPStride, jint cbRStride,
/** Cr Plane */
jobject crBuf, jint crPStride, jint crRStride,
/** Output */
jobject outBuf, jint outBufCapacity,
/** Jpeg compression parameters */
jint quality,
/** Crop */
jint cropLeft, jint cropTop, jint cropRight, jint cropBottom,
/** Rotation (multiple of 90). For example, rot90 = 1 implies a 90 degree
* rotation. */
jint rot90) {
jbyte* y = (jbyte*)env->GetDirectBufferAddress(yBuf);
jbyte* cb = (jbyte*)env->GetDirectBufferAddress(cbBuf);
jbyte* cr = (jbyte*)env->GetDirectBufferAddress(crBuf);
jbyte* out = (jbyte*)env->GetDirectBufferAddress(outBuf);
return Compress(width, height, //
(unsigned char*)y, yPStride, yRStride, //
(unsigned char*)cb, cbPStride, cbRStride, //
(unsigned char*)cr, crPStride, crRStride, //
(unsigned char*)out, (size_t)outBufCapacity, //
quality, //
cropLeft, cropTop, cropRight, cropBottom, //
rot90);
}
/**
* Copies the Image.Plane specified by planeBuf, pStride, and rStride to the
* Bitmap.
*
* @param env the JNI environment
* @param clazz the java class
* @param width the width of the output image
* @param height the height of the output image
* @param planeBuf the native ByteBuffer containing the image plane data
* @param pStride the stride between adjacent pixels in the same row of
*planeBuf
* @param rStride the stride between adjacent rows in planeBuf
* @param rot90 the multiple of 90 degrees to rotate, one of {0, 1, 2, 3}.
*/
extern "C" JNIEXPORT void JNICALL
Java_com_android_camera_util_JpegUtilNative_copyImagePlaneToBitmap(
JNIEnv* env, jclass clazz, jint width, jint height, jobject planeBuf,
jint pStride, jint rStride, jobject outBitmap, jint rot90) {
jbyte* src = (jbyte*)env->GetDirectBufferAddress(planeBuf);
char* dst = 0;
AndroidBitmap_lockPixels(env, outBitmap, (void**)&dst);
if (rot90 == 0) {
// No rotation
for (int y = 0; y < height; y++) {
char* srcPtr = reinterpret_cast<char*>(&src[y * rStride]);
char* dstPtr = &dst[y * width];
for (int x = 0; x < width; x++) {
*dstPtr = *srcPtr;
srcPtr += pStride;
dstPtr++;
}
}
} else if (rot90 == 1) {
// 90-degree rotation
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
int srcX = height - 1 - y;
int srcY = x;
dst[y * width + x] = src[srcX * pStride + rStride * srcY];
}
}
} else if (rot90 == 2) {
// 180-degree rotation
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
int srcX = width - 1 - x;
int srcY = height - 1 - y;
dst[y * width + x] = src[srcX * pStride + rStride * srcY];
}
}
} else if (rot90 == 3) {
// 270-degree rotation
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
int srcX = y;
int srcY = width - 1 - x;
dst[y * width + x] = src[srcX * pStride + rStride * srcY];
}
}
}
AndroidBitmap_unlockPixels(env, outBitmap);
}