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authorRuben Brunk <rubenbrunk@google.com>2013-06-29 03:02:54 (GMT)
committerRuben Brunk <rubenbrunk@google.com>2013-07-11 20:41:29 (GMT)
commita8221bbdb8ece9b02dbf7b72565f9fbc5b314f7c (patch)
tree0fd84567e4f8a8d2bff0e7dcd696c88d518251cb /jni_jpegstream/src/outputstream_wrapper.cpp
parent0c1b4c6422a4d2d9b81cc0946d1c9675440a94e2 (diff)
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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/outputstream_wrapper.cpp')
-rw-r--r--jni_jpegstream/src/outputstream_wrapper.cpp49
1 files changed, 49 insertions, 0 deletions
diff --git a/jni_jpegstream/src/outputstream_wrapper.cpp b/jni_jpegstream/src/outputstream_wrapper.cpp
new file mode 100644
index 0000000..0639b6e
--- /dev/null
+++ b/jni_jpegstream/src/outputstream_wrapper.cpp
@@ -0,0 +1,49 @@
+/*
+ * 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.
+ */
+
+#include "outputstream_wrapper.h"
+#include "error_codes.h"
+
+jmethodID OutputStreamWrapper::sWriteID = NULL;
+
+int32_t OutputStreamWrapper::write(int32_t length, int32_t offset) {
+ if (offset < 0 || length < 0 || (offset + length) > getBufferSize()) {
+ return J_ERROR_BAD_ARGS;
+ }
+ mEnv->ReleaseByteArrayElements(mByteArray, mBytes, JNI_COMMIT);
+ mBytes = NULL;
+ if (mEnv->ExceptionCheck()) {
+ return J_EXCEPTION;
+ }
+ if (sWriteID == NULL) {
+ LOGE("Uninitialized method ID for OutputStream write function.");
+ return J_ERROR_FATAL;
+ }
+ // Call OutputStream write with byte array.
+ mEnv->CallVoidMethod(mStream, sWriteID, mByteArray, offset, length);
+ if (mEnv->ExceptionCheck()) {
+ return J_EXCEPTION;
+ }
+ mBytes = mEnv->GetByteArrayElements(mByteArray, NULL);
+ if (mBytes == NULL || mEnv->ExceptionCheck()) {
+ return J_EXCEPTION;
+ }
+ return J_SUCCESS;
+}
+
+void OutputStreamWrapper::setWriteMethodID(jmethodID id) {
+ sWriteID = id;
+}