84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef JPEG_WRITER_H_
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#define JPEG_WRITER_H_
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#include "jerr_hook.h"
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#include "jni_defines.h"
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#include "jpeg_config.h"
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#include <stdint.h>
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/**
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* JpegWriter wraps libjpeg's compression functionality and a
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* java OutputStream object. Write calls result in input data
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* being compressed and written to the OuputStream.
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*/
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class JpegWriter {
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public:
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JpegWriter();
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~JpegWriter();
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/**
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* Call setup with a valid OutputStream reference, bitmap height and
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* width, pixel format, and compression quality in range (0, 100].
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*
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* Returns J_SUCCESS on success or a negative error code.
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*/
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int32_t setup(JNIEnv *env, jobject out, int32_t width, int32_t height,
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Jpeg_Config::Format format, int32_t quality);
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/**
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* Compresses bytes from the input buffer.
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*
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* ***This method will result in bytes being written to the OutputStream***
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*
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* Returns J_SUCCESS on success or a negative error code.
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*/
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int32_t write(int8_t* bytes, int32_t length);
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/**
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* Updates the environment pointer. Call this before write or reset
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* in any jni function call.
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*/
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void updateEnv(JNIEnv *env);
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/**
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* Frees any java global references held by the JpegWriter, destroys
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* the compress structure, and frees allocations in libjpeg's pools.
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*/
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int32_t reset();
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static const int32_t DEFAULT_X_DENSITY;
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static const int32_t DEFAULT_Y_DENSITY;
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static const int32_t DEFAULT_DENSITY_UNIT;
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private:
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void formatPixels(uint8_t* buf, int32_t len);
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struct jpeg_compress_struct mInfo;
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ErrManager mErrorManager;
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JSAMPLE* mScanlineBuf;
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JSAMPLE* mScanlineIter;
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int32_t mScanlineBuflen;
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int32_t mScanlineBytesRemaining;
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Jpeg_Config::Format mFormat;
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bool mFinished;
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bool mSetup;
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};
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#endif // JPEG_WRITER_H_
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