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 #ifndef LIBJPEG_HOOK_H_ 18 #define LIBJPEG_HOOK_H_ 19 20 extern "C" { 21 #include "jinclude.h" 22 #include "jpeglib.h" 23 #include "jerror.h" 24 } 25 26 #include "inputstream_wrapper.h" 27 #include "outputstream_wrapper.h" 28 29 #include <stdint.h> 30 31 /** 32 * DestManager holds the libjpeg destination manager struct and 33 * a holder with a java OutputStream. 34 */ 35 typedef struct { 36 struct jpeg_destination_mgr mgr; 37 OutputStreamWrapper *outStream; 38 } DestManager; 39 40 // Initializes the DestManager struct, sets up the jni refs 41 int32_t MakeDst(j_compress_ptr cinfo, JNIEnv *env, jobject outStream); 42 43 /** 44 * Updates the jni env pointer. This should be called in the beginning of any 45 * JNI method in jpegstream.cpp before CleanDst or any of the libjpeg functions 46 * that can trigger a call to an OutputStreamWrapper method. 47 */ 48 void UpdateDstEnv(j_compress_ptr cinfo, JNIEnv* env); 49 50 // Cleans the jni refs. To wipe the compress object call jpeg_destroy_compress 51 void CleanDst(j_compress_ptr cinfo); 52 53 /** 54 * SourceManager holds the libjpeg source manager struct and a 55 * holder with a java InputStream. 56 */ 57 typedef struct { 58 struct jpeg_source_mgr mgr; 59 boolean start_of_file; 60 InputStreamWrapper *inStream; 61 } SourceManager; 62 63 // Initializes the SourceManager struct, sets up the jni refs 64 int32_t MakeSrc(j_decompress_ptr cinfo, JNIEnv *env, jobject inStream); 65 66 /** 67 * Updates the jni env pointer. This should be called in the beginning of any 68 * JNI method in jpegstream.cpp before CleanSrc or any of the libjpeg functions 69 * that can trigger a call to an InputStreamWrapper method. 70 */ 71 void UpdateSrcEnv(j_decompress_ptr cinfo, JNIEnv* env); 72 73 // Cleans the jni refs. To wipe the decompress object, call jpeg_destroy_decompress 74 void CleanSrc(j_decompress_ptr cinfo); 75 76 #endif // LIBJPEG_HOOK_H_ 77