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imageio.cpp

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/*
 * imageio.cpp
 *
 * Copyright (c) 2003 Machine Perception Laboratory
 * University of California San Diego.
 * Please read the disclaimer and notes about redistribution
 * at the end of this file.
 *
 * Authors: Josh Susskind, Bret Fortenberry
 */

#ifdef WIN32
#include <windows.h>
#endif
#include "imageio.h"
#include <fstream>

#include "../common.h"

using namespace std;

// ================================================================

// This is the implementation function that writes the captured video
// data onto a bitmap on the user's disk.
//
int MPImageIO::WriteBitmap(unsigned char * pBuffer, long lBufferSize, int lWidth, int lHeight, char *m_szSnappedName, int bitcount)
{
        int extrabytes = (4 - lWidth % 4) % 4;
        const int size = ((lWidth+extrabytes)*lHeight)*(bitcount/8);
        unsigned char * tempbuffer;
        int pos = 0;

        /*if width is not multple of four then extra bytes need to be added*/
        if(extrabytes){
                int pos = 0;
                tempbuffer = new BYTE[size];
                for(int y=0;y<lHeight;y++){
                        for(int x =0; x< lWidth;x++)
                        {
                                tempbuffer[pos] = pBuffer[x+y*lWidth];
                                pos++;
                        }
                        for(x = 0; x < extrabytes*(bitcount/8); x++)
                        {
                                tempbuffer[pos] = 0;
                                pos++;
                        }
                }
                lBufferSize = pos;
        }

        BITMAPFILEHEADER bfh;
        BITMAPINFOHEADER bih;
        ofstream os(m_szSnappedName, ios::binary);
        memset( &bfh, 0, sizeof( bfh ) );
        bfh.bfType = 'MB';
        bfh.bfSize = sizeof( bfh ) + lBufferSize + sizeof( BITMAPINFOHEADER );
        if(bitcount == 24)
                bfh.bfOffBits = sizeof( BITMAPINFOHEADER ) + sizeof( BITMAPFILEHEADER );
        else if(bitcount == 8)
                bfh.bfOffBits = sizeof( BITMAPINFOHEADER ) + sizeof( BITMAPFILEHEADER ) + 1024;
        //bfh.bfOffBits = sizeof( BITMAPINFOHEADER ) + sizeof( BITMAPFILEHEADER );
        os.write((char*)&bfh, sizeof(bfh)); 
        //os.flush();
        memset( &bih, 0, sizeof( bih ) );
        bih.biSize = sizeof( bih );
        bih.biWidth = lWidth;
        bih.biHeight = lHeight;
        bih.biPlanes = 1;
        bih.biBitCount = bitcount;
        os.write((char*)&bih, sizeof(bih));
        //os.flush();
        /*adds header buffer needed for 8 bit*/
        if(bitcount == 8)
        {
                unsigned char update = 0;
                unsigned char buffArray[1024];
                int i = 0;
                while(i < 1024)
                {
                        for(int n = 0; n < 3; n++,i++)
                                buffArray[i] = update;
                        update++;
                        buffArray[i] = 0;
                        i++;
                }
                os.write((char*)buffArray, 1024);
        }
        /*adds extrabyte buffer for every row*/
        if(extrabytes){
                os.write((char*)tempbuffer, sizeof(char)*lBufferSize);
                delete [] tempbuffer;
        }
        else
                os.write((char*)pBuffer, sizeof(char)*lBufferSize);
        //os.flush();
        os.close();
        return 0;
}

// ================================================================

int MPImageIO::WriteBitmap(float * float_pBuffer, long lBufferSize, int lWidth, int lHeight, char *m_szSnappedName, int bitcount, bool flipped)
{
        int extrabytes = (4 - lWidth % 4) % 4;
        const int size = ((lWidth+extrabytes)*lHeight)*(bitcount/8);
        const int imSize = (lWidth*lHeight)*(bitcount/8);
        BYTE * tempbuffer;
        BYTE * pBuffer = new BYTE[imSize];
        BYTE *temp;
        float *ftemp;
        int pos = 0;

        if(flipped) temp = &pBuffer[0];
        else temp = &pBuffer[imSize-1];
        ftemp = float_pBuffer;
        // switch from float to unsigned char
        for(int height = 0; height < lHeight; height++) { 
                int y = height;
                if(!flipped) y = lHeight-y;
                for (int width = 0; width < lWidth; width++) {
                        for(int bitSize = 0; bitSize < bitcount/8; bitSize++){
                                if (flipped) *temp++ = static_cast<unsigned char>(*ftemp++);
                                else *temp-- = static_cast<unsigned char>(*ftemp++);
                        }
                }
        }

        /*if width is not multple of four then extra bytes need to be added*/
        if(extrabytes){
                int pos = 0;
                tempbuffer = new BYTE[size];
                for(int y=0;y<lHeight;y++){
                        for(int x =0; x< lWidth;x++)
                        {
                                tempbuffer[pos] = pBuffer[x+y*lWidth];
                                pos++;
                        }
                        for(x = 0; x < extrabytes*(bitcount/8); x++)
                        {
                                tempbuffer[pos] = 0;
                                pos++;
                        }
                }
                lBufferSize = pos;
        }

        BITMAPFILEHEADER bfh;
        BITMAPINFOHEADER bih;
        ofstream os(m_szSnappedName, ios::binary);
        memset( &bfh, 0, sizeof( bfh ) );
        bfh.bfType = 'MB';
        bfh.bfSize = sizeof( bfh ) + lBufferSize + sizeof( BITMAPINFOHEADER );
        if(bitcount == 24)
                bfh.bfOffBits = sizeof( BITMAPINFOHEADER ) + sizeof( BITMAPFILEHEADER );
        else if(bitcount == 8)
                bfh.bfOffBits = sizeof( BITMAPINFOHEADER ) + sizeof( BITMAPFILEHEADER ) + 1024;
        //bfh.bfOffBits = sizeof( BITMAPINFOHEADER ) + sizeof( BITMAPFILEHEADER );
        os.write((char*)&bfh, sizeof(bfh)); 
        //os.flush();
        memset( &bih, 0, sizeof( bih ) );
        bih.biSize = sizeof( bih );
        bih.biWidth = lWidth;
        bih.biHeight = lHeight;
        bih.biPlanes = 1;
        bih.biBitCount = bitcount;
        os.write((char*)&bih, sizeof(bih));
        //os.flush();
        /*adds header buffer needed for 8 bit*/
        if(bitcount == 8)
        {
                unsigned char update = 0;
                unsigned char buffArray[1024];
                int i = 0;
                while(i < 1024)
                {
                        for(int n = 0; n < 3; n++,i++)
                                buffArray[i] = update;
                        update++;
                        buffArray[i] = 0;
                        i++;
                }
                os.write((char*)buffArray, 1024);
        }
        /*adds extrabyte buffer for every row*/
        if(extrabytes){
                os.write((char*)tempbuffer, sizeof(char)*lBufferSize);
                delete [] tempbuffer;
        }
        else
                os.write((char*)pBuffer, sizeof(char)*lBufferSize);
        //os.flush();
        os.close();
        return 0;
}

// ================================================================

BITMAPINFOHEADER MPImageIO::LoadBitmapHeader(char* inFile)
{
        BITMAPINFOHEADER bmih;
        ifstream is(inFile, ios::binary);
        is.seekg(sizeof(BITMAPFILEHEADER), ios_base::beg );
        is.read((char*) &bmih, sizeof( bmih ));
        is.close();
        return(bmih);
}

// ================================================================

void MPImageIO::LoadBitmapPixels(BYTE* bitPixels, char* inFile, BITMAPINFOHEADER &bmih)
{
        BITMAPFILEHEADER bmfh;
        int remainder;
        unsigned char * tempPixArray;

        ifstream is(inFile, ios::binary);
        is.read((char*) &bmfh, sizeof( bmfh ));
        is.seekg(sizeof(bmih), ios_base::cur);

        remainder = (4 - bmih.biWidth % 4) % 4;
        int size = bmfh.bfSize-bmfh.bfOffBits;
        int temp = bmfh.bfOffBits - 54;
        tempPixArray = new BYTE[size];
        
        if (bmih.biBitCount == 24)
        {
                is.read((char*)bitPixels, size);
        }

        if (bmih.biBitCount == 8)
        {
                is.read((char*)tempPixArray, temp);
                is.read((char*)tempPixArray, size);
                
        }
        
        //flip image
        int pos =0;
        if(bmih.biBitCount == 8){
                for(int y = bmih.biHeight - 1; y >= 0; y--){
                        for(int x = 0; x < bmih.biWidth; x++){
                                //is only functional if rgb(24 bit)
                                for(int p = 0; p < bmih.biBitCount/8; p++){
                                        bitPixels[pos] = tempPixArray[x+y*bmih.biWidth+p];
                                        pos++;
                                }
                        }
                }
        } 
        
        delete [] tempPixArray;

}

// ================================================================

BITMAPINFOHEADER MPImageIO::LoadBmp(unsigned char * bitPixels, char* inFile)
{
        BITMAPINFOHEADER bmih = LoadBitmapHeader(inFile);
        LoadBitmapPixels(bitPixels, inFile, bmih);
        return (bmih);
}

// ================================================================

/*
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 * 
 *    1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *    3. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */

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