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/*
* Copyright (C) 2006 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 _ANDROID_GRAPHICS_UTILS_H_
#define _ANDROID_GRAPHICS_UTILS_H_
#include "SkStream.h"
#include "android_util_Binder.h"
#include <jni.h>
#include <androidfw/Asset.h>
namespace android {
class AssetStreamAdaptor : public SkStreamRewindable {
public:
explicit AssetStreamAdaptor(Asset*);
virtual bool rewind();
virtual size_t read(void* buffer, size_t size);
virtual bool hasLength() const { return true; }
virtual size_t getLength() const;
virtual bool hasPosition() const;
virtual size_t getPosition() const;
virtual bool seek(size_t position);
virtual bool move(long offset);
virtual bool isAtEnd() const;
protected:
SkStreamRewindable* onDuplicate() const override;
private:
Asset* fAsset;
};
/**
* Make a deep copy of the asset, and return it as a stream, or NULL if there
* was an error.
* FIXME: If we could "ref/reopen" the asset, we may not need to copy it here.
*/
SkMemoryStream* CopyAssetToStream(Asset*);
/** Restore the file descriptor's offset in our destructor
*/
class AutoFDSeek {
public:
explicit AutoFDSeek(int fd) : fFD(fd) {
fCurr = ::lseek(fd, 0, SEEK_CUR);
}
~AutoFDSeek() {
if (fCurr >= 0) {
::lseek(fFD, fCurr, SEEK_SET);
}
}
private:
int fFD;
off64_t fCurr;
};
jobject nullObjectReturn(const char msg[]);
/** Check if the file descriptor is seekable.
*/
bool isSeekable(int descriptor);
JNIEnv* get_env_or_die(JavaVM* jvm);
}; // namespace android
#endif // _ANDROID_GRAPHICS_UTILS_H_
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