libksquirrel/kernel/kls_wbmp/fmt_codec_wbmp.cpp

/*  This file is part of ksquirrel-libs (http://ksquirrel.sf.net)

    Copyright (c) 2005 Dmitry Baryshev <ksquirrel@tut.by>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation;
    either version 2 of the License, or (at your option) any later
    version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/


/*
 *  The Wireless Application Protocol Bitmap Format (WBMP) is designed for use 
 *  with applications that operate over wireless communication networks.
 *  The WBMP format is commonly used in mobile phones (WAP phones) and enables
 *  graphical information to be sent to the handset.
 *  This format is very simple and allows to store image only in 1-bit
 *  format (black and white).
 */


#include <iostream>
#include <stdio.h>
#include <string.h>

#include "ksquirrel-libs/fmt_types.h"
#include "ksquirrel-libs/fmt_utils.h"
#include "ksquirrel-libs/fileio.h"
#include "ksquirrel-libs/error.h"

#include "fmt_codec_wbmp_defs.h"
#include "fmt_codec_wbmp.h"

#include "../xpm/codec_wbmp.xpm"

/*
 *
 *  WBMP: Wireless Bitmap Type 0: B/W, Uncompressed Bitmap
 *  Specification of the WBMP format can be found in the 
 *  SPEC-WAESpec-19990524.pdf
 *
 *  You can download the WAP specification on: http://www.wapforum.com/
 *
 */

static const RGB mono[2] = {  RGB(255,255,255), RGB(0,0,0) };

fmt_codec::fmt_codec() : fmt_codec_base()
{}

fmt_codec::~fmt_codec()
{}

void fmt_codec::options(codec_options *o)
{
    o->version = "0.9.0";
    o->name = "Wireless Application Protocol Bitmap";
    o->filter = "*.wbmp ";
    o->config = "";
    o->mime = "";
    o->mimetype = "image/x-wbmp";
    o->pixmap = codec_wbmp;
    o->readable = true;
    o->canbemultiple = false;
    o->writestatic = false;
    o->writeanimated = false;
    o->needtempfile = false;
}

s32 fmt_codec::read_init(const std::string &file)
{
    frs.open(file.c_str(), ios::binary | ios::in);

    if(!frs.good())
        return SQE_R_NOFILE;

    currentImage = -1;

    finfo.animated = false;

    wbmp.bitmap = NULL;

    return SQE_OK;
}

s32 fmt_codec::read_next()
{
    currentImage++;

    if(currentImage)
        return SQE_NOTOK;

    fmt_image image;

    u8 type;

    frs.readK(&type, sizeof(u8));
    
    wbmp.type = type;

    if(wbmp.type != 0)
	return SQE_R_BADFILE;

    if(skipheader(frs))
	return SQE_R_BADFILE;

    wbmp.width = getmbi(frs);

    if(wbmp.width == -1)
	return SQE_R_BADFILE;

    wbmp.height = getmbi(frs);

    if(wbmp.height == -1)
	return SQE_R_BADFILE;

    image.w = wbmp.width;
    image.h = wbmp.height;
    image.bpp = 1;

    wbmp.bitmap = new s32 [wbmp.width * wbmp.height];

    if(!wbmp.bitmap)
	return SQE_R_NOMEMORY;

    s32 row, col, byte, pel, pos;
    u8 b;

    pos = 0;

    for(row = 0;row < wbmp.height;row++)
    {
        for(col = 0;col < wbmp.width;)
        {
            if(!frs.readK(&b, sizeof(u8)))
		return SQE_R_BADFILE;

	    byte = b;

            for(pel = 7;pel >= 0;pel--)
            {
                if(col++ < wbmp.width)
                {
                    if(byte & 1 << pel)
                        wbmp.bitmap[pos] = WBMP_WHITE;
                    else
                        wbmp.bitmap[pos] = WBMP_BLACK;

                    pos++;
                }
            }
	}
    }

    image.compression = "-";
    image.colorspace = fmt_utils::colorSpaceByBpp(1);

    finfo.image.push_back(image);

    line = -1;

    return SQE_OK;
}

s32 fmt_codec::read_next_pass()
{
    return SQE_OK;
}

s32 fmt_codec::read_scanline(RGBA *scan)
{
    fmt_image *im = image(currentImage);
    fmt_utils::fillAlpha(scan, im->w);

    line++;

    for(s32 i = 0;i < im->w;i++)
	memcpy(scan+i, mono + (wbmp.bitmap[line * im->w + i]), sizeof(RGB));

    return SQE_OK;
}

void fmt_codec::read_close()
{
    frs.close();

    delete [] wbmp.bitmap;
    wbmp.bitmap = NULL;

    finfo.meta.clear();
    finfo.image.clear();
}

/*
 *
 * These functions were taken from Wbmp program by Johan Van den Brande
 *
 * (c) 2000 Johan Van den Brande <johan@vandenbrande.com>
 *
 */

s32 fmt_codec::getmbi(ifstreamK &f)
{
    s32 mbi = 0;
    s8 i;

    do
    {
        f.readK(&i, sizeof(s8));

        if(i < 0)
            return -1;

        mbi = (mbi << 7) | (i & 0x7f);

    }while(i & 0x80);

    return mbi;
}

s32 fmt_codec::putmbi(s32 i, ofstreamK &f)
{
    s32 cnt, l, accu;
    u8 s;

    /* Get number of septets */
    cnt = 0;
    accu = 0;

    while(accu != i)
        accu += i & 0x7f << 7*cnt++;

    /* Produce the multibyte output */
    for(l = cnt-1;l > 0;l--)
    {
	s = 0x80 | (i & 0x7f << 7*l ) >> 7*l;
        f.writeK(&s, sizeof(s8));
    }

    s = i & 0x7f; 

    f.writeK(&s, sizeof(u8));

    return 0;
}

s32 fmt_codec::skipheader(ifstreamK &f)
{
    s8 i;
    bool b;

    do
    {
        b = f.readK(&i, sizeof(s8));

	if(!b)
	    return -1;

        if(i < 0)
                return -1;

    }while(i & 0x80);

    return 0;
}

#include "fmt_codec_cd_func.h"