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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:
// Enum passed to constructor. If set to kYes_OwnAsset,
// the passed in Asset will be deleted upon destruction.
enum OwnAsset {
kYes_OwnAsset,
kNo_OwnAsset,
};
// Enum passed to constructor. If set to kYes_HasMemoryBase,
// getMemoryBase will return the Asset's buffer.
enum HasMemoryBase {
kYes_HasMemoryBase,
kNo_HasMemoryBase,
};
AssetStreamAdaptor(Asset*, OwnAsset, HasMemoryBase);
~AssetStreamAdaptor();
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 isAtEnd() const;
virtual const void* getMemoryBase() { return fMemoryBase; }
virtual SkStreamRewindable* duplicate() const;
private:
Asset* fAsset;
const void* const fMemoryBase;
const OwnAsset fOwnAsset;
};
/**
* 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:
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[]);
}; // namespace android
#endif // _ANDROID_GRAPHICS_UTILS_H_
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