blob: afde27b93217efa6f02b5189357b12b5b07d6cca [file] [log] [blame]
* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#ifndef JPEG_READER_H_
#define JPEG_READER_H_
#include "jerr_hook.h"
#include "jni_defines.h"
#include "jpeg_config.h"
#include <stdint.h>
* JpegReader wraps libjpeg's decompression functionality and a
* java InputStream object. Read calls return data from the
* InputStream that has been decompressed.
class JpegReader {
* Call setup with a valid InputStream reference and pixel format.
* If this method is successful, the contents of width and height will
* be set to the dimensions of the bitmap to be read.
* ***This method will result in the jpeg file header being read
* from the InputStream***
* Returns J_SUCCESS on success or a negative error code.
int32_t setup(JNIEnv *env, jobject in, int32_t* width, int32_t* height,
Jpeg_Config::Format format);
* Decompresses bytes from the InputStream and writes at most count
* bytes into the buffer, bytes, starting at some offset. Passing a
* NULL as the bytes pointer effectively skips those bytes.
* ***This method will result in bytes being read from the InputStream***
* Returns the number of bytes written into the input buffer or a
* negative error code.
int32_t read(int8_t * bytes, int32_t offset, int32_t count);
* Updates the environment pointer. Call this before read or reset
* in any jni function call.
void updateEnv(JNIEnv *env);
* Frees any java global references held by the JpegReader, destroys
* the decompress structure, and frees allocations in libjpeg's pools.
int32_t reset();
void formatPixels(uint8_t* buf, int32_t len);
struct jpeg_decompress_struct mInfo;
ErrManager mErrorManager;
JSAMPLE* mScanlineBuf;
JSAMPLE* mScanlineIter;
int32_t mScanlineBuflen;
int32_t mScanlineUnformattedBuflen;
int32_t mScanlineBytesRemaining;
Jpeg_Config::Format mFormat;
bool mFinished;
bool mSetup;
#endif // JPEG_READER_H_