From a8221bbdb8ece9b02dbf7b72565f9fbc5b314f7c Mon Sep 17 00:00:00 2001
From: Ruben Brunk <rubenbrunk@google.com>
Date: Fri, 28 Jun 2013 20:02:54 -0700
Subject: 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
---
 jni_jpegstream/src/jpeg_hook.h | 76 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 jni_jpegstream/src/jpeg_hook.h

(limited to 'jni_jpegstream/src/jpeg_hook.h')

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_
-- 
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