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author | Ruben Brunk <rubenbrunk@google.com> | 2013-06-28 20:02:54 -0700 |
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committer | Ruben Brunk <rubenbrunk@google.com> | 2013-07-11 13:41:29 -0700 |
commit | a8221bbdb8ece9b02dbf7b72565f9fbc5b314f7c (patch) | |
tree | 0fd84567e4f8a8d2bff0e7dcd696c88d518251cb /jni_jpegstream/src/jpeg_hook.h | |
parent | 0c1b4c6422a4d2d9b81cc0946d1c9675440a94e2 (diff) | |
download | android_packages_apps_Gallery2-a8221bbdb8ece9b02dbf7b72565f9fbc5b314f7c.tar.gz android_packages_apps_Gallery2-a8221bbdb8ece9b02dbf7b72565f9fbc5b314f7c.tar.bz2 android_packages_apps_Gallery2-a8221bbdb8ece9b02dbf7b72565f9fbc5b314f7c.zip |
Added jpeg streaming classes.
- Provides streaming operations for decompressing/compressing
JPEG files.
- Allows pixel operations to be performed on large JPEG images
without holding the entire bitmap in memory.
Change-Id: I597ddf282b59d2ba6d6bca4722208121e3728f94
Diffstat (limited to 'jni_jpegstream/src/jpeg_hook.h')
-rw-r--r-- | jni_jpegstream/src/jpeg_hook.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/jni_jpegstream/src/jpeg_hook.h b/jni_jpegstream/src/jpeg_hook.h new file mode 100644 index 000000000..b02bb34c0 --- /dev/null +++ b/jni_jpegstream/src/jpeg_hook.h @@ -0,0 +1,76 @@ +/* + * 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. + */ + +#ifndef LIBJPEG_HOOK_H_ +#define LIBJPEG_HOOK_H_ + +extern "C" { +#include "jinclude.h" +#include "jpeglib.h" +#include "jerror.h" +} + +#include "inputstream_wrapper.h" +#include "outputstream_wrapper.h" + +#include <stdint.h> + +/** + * DestManager holds the libjpeg destination manager struct and + * a holder with a java OutputStream. + */ +typedef struct { + struct jpeg_destination_mgr mgr; + OutputStreamWrapper *outStream; +} DestManager; + +// Initializes the DestManager struct, sets up the jni refs +int32_t MakeDst(j_compress_ptr cinfo, JNIEnv *env, jobject outStream); + +/** + * Updates the jni env pointer. This should be called in the beginning of any + * JNI method in jpegstream.cpp before CleanDst or any of the libjpeg functions + * that can trigger a call to an OutputStreamWrapper method. + */ +void UpdateDstEnv(j_compress_ptr cinfo, JNIEnv* env); + +// Cleans the jni refs. To wipe the compress object call jpeg_destroy_compress +void CleanDst(j_compress_ptr cinfo); + +/** + * SourceManager holds the libjpeg source manager struct and a + * holder with a java InputStream. + */ +typedef struct { + struct jpeg_source_mgr mgr; + boolean start_of_file; + InputStreamWrapper *inStream; +} SourceManager; + +// Initializes the SourceManager struct, sets up the jni refs +int32_t MakeSrc(j_decompress_ptr cinfo, JNIEnv *env, jobject inStream); + +/** + * Updates the jni env pointer. This should be called in the beginning of any + * JNI method in jpegstream.cpp before CleanSrc or any of the libjpeg functions + * that can trigger a call to an InputStreamWrapper method. + */ +void UpdateSrcEnv(j_decompress_ptr cinfo, JNIEnv* env); + +// Cleans the jni refs. To wipe the decompress object, call jpeg_destroy_decompress +void CleanSrc(j_decompress_ptr cinfo); + +#endif // LIBJPEG_HOOK_H_ |