BMPWriter.cpp

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#include "MercuryFiles.h"
#include "BMPWriter.h"

void WriteBMP(const MString& path, const RawImageData& image)
{
    BMPHeader header;
    BMPInfoHeader info;
    char buffer[3];

    info.imagesize = image.attrs.m_height * image.attrs.m_width * 3;
    unsigned int realSize = image.attrs.m_height * image.attrs.m_width * ColorBytesToSize(image.attrs.m_ColorByteType);

    header.offset = 54;
    memcpy(header.ID, "BM", 2);
    header.fileSize = 54 + info.imagesize;
    header.reserved = 0;

    info.bbp = 24; //RGB
    info.compression = 0;
    info.headerSize = 40;
    info.height = image.attrs.m_height;
    info.width = image.attrs.m_width;
    info.importantColor = 0;
    info.numColor = 0;
    info.planes = 1;
    info.resx = (int)(image.attrs.m_dpi_x * 39.3700787);
    info.resy = (int)(image.attrs.m_dpi_y * 39.3700787);

    MercuryFile* f = FILEMAN.Open(path, MFP_WRITE_ONLY);

    //Manually write all this stuff because of padding
    f->Write(header.ID, 2);
    f->Write(&header.fileSize, 4);
    f->Write(&header.reserved, 4);
    f->Write(&header.offset, 4);
//  f->Write(&header, 14);
    f->Write(&info, 40);

    //RGB -> BGR
    if (image.attrs.m_ColorByteType == RGB)
        for (unsigned int x = 0; x < realSize; x += 3)
        {
            buffer[2] = image.data[x];
            buffer[1] = image.data[x+1];
            buffer[0] = image.data[x+2];
            f->Write(buffer, 3);
        }
    else if (image.attrs.m_ColorByteType == RGBA)
        for (unsigned int x = 0; x < realSize; x += 4)
        {
            buffer[2] = image.data[x];
            buffer[1] = image.data[x+1];
            buffer[0] = image.data[x+2];
            f->Write(buffer, 3);
        }

    SAFE_DELETE(f);
}

/* 
 * Copyright (c) 2006 Joshua Allen
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *  -   Redistributions of source code must retain the above
 *      copyright notice, this list of conditions and the following disclaimer.
 *  -   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.
 *  -   Neither the name of the Mercury Engine nor the names of its
 *      contributors may be used to endorse or promote products derived from
 *      this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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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