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      1 /*
      2  * Copyright (C) 2013 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 #define LOG_NDEBUG 0
     18 #define LOG_TAG "EmulatedCamera_JPEGStub"
     19 #include <errno.h>
     20 #include <cutils/log.h>
     21 #include <YuvToJpegEncoder.h>
     22 
     23 #include "JpegStub.h"
     24 
     25 
     26 extern "C" void JpegStub_init(JpegStub* stub, int* strides) {
     27     stub->mInternalEncoder = (void*) new Yuv420SpToJpegEncoder(strides);
     28     stub->mInternalStream = (void*)new SkDynamicMemoryWStream();
     29 }
     30 
     31 extern "C" void JpegStub_cleanup(JpegStub* stub) {
     32     delete((Yuv420SpToJpegEncoder*)stub->mInternalEncoder);
     33     delete((SkDynamicMemoryWStream*)stub->mInternalStream);
     34 }
     35 
     36 extern "C" int JpegStub_compress(JpegStub* stub, const void* image,
     37         int width, int height, int quality)
     38 {
     39     void* pY = const_cast<void*>(image);
     40     int offsets[2];
     41     offsets[0] = 0;
     42     offsets[1] = width * height;
     43 
     44     Yuv420SpToJpegEncoder* encoder =
     45         (Yuv420SpToJpegEncoder*)stub->mInternalEncoder;
     46     SkDynamicMemoryWStream* stream =
     47         (SkDynamicMemoryWStream*)stub->mInternalStream;
     48     if (encoder->encode(stream, pY, width, height, offsets, quality)) {
     49         ALOGV("%s: Compressed JPEG: %d[%dx%d] -> %zu bytes",
     50               __FUNCTION__, (width * height * 12) / 8,
     51               width, height, stream->getOffset());
     52         return 0;
     53     } else {
     54         ALOGE("%s: JPEG compression failed", __FUNCTION__);
     55         return errno ? errno: EINVAL;
     56     }
     57 }
     58 
     59 extern "C" void JpegStub_getCompressedImage(JpegStub* stub, void* buff) {
     60     SkDynamicMemoryWStream* stream =
     61         (SkDynamicMemoryWStream*)stub->mInternalStream;
     62     stream->copyTo(buff);
     63 }
     64 
     65 extern "C" size_t JpegStub_getCompressedSize(JpegStub* stub) {
     66     SkDynamicMemoryWStream* stream =
     67         (SkDynamicMemoryWStream*)stub->mInternalStream;
     68     return stream->getOffset();
     69 }
     70