OpenVideo Documentation

PixelFormat.cxx

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/* ========================================================================
* Copyright (C) 2005  Graz University of Technology
*
* This framework is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This framework 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this framework; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*
* For further information please contact Denis Kalkofen under
* <kalkofen@icg.tu-graz.ac.at> or write to Denis Kalkofen,
* Graz University of Technology, Inffeldgasse 16a, A8010 Graz,
* Austria.
* ========================================================================
* PROJECT: OpenVideo
* ======================================================================== */
/* ======================================================================= */


#include <openvideo/PixelFormat.h>

#ifdef OV_IS_WINDOWS
#  include <windows.h>
#endif

#include <GL/gl.h>
#include <map>


#ifndef GL_BGR
#  define GL_BGR 0x80E0
#endif

#ifndef GL_BGRA
#  define GL_BGRA 0x80E1
#endif


namespace openvideo 
{


typedef std::map<std::string, PIXEL_FORMAT> StringFormatMap;
typedef std::pair<std::string, PIXEL_FORMAT> StringFormatPair;


const char* formatNames[] = {
        "R8G8B8",
        "B8G8R8",
        "R8G8B8X8",
        "B8G8R8X8",
        "R5G6B5",
        "L8",
        "UNKNOWN"
    };

static StringFormatMap stringFormatMap;


static void
fillStringFormatMap()
{
    stringFormatMap.clear();

    for(int i=0; i<FORMAT_UNKNOWN; i++)
        stringFormatMap.insert( StringFormatPair(formatNames[i], static_cast<PIXEL_FORMAT>(i)) );
}


PIXEL_FORMAT
PixelFormat::StringToFormat(const std::string& formatName)
{
    if(stringFormatMap.empty())
        fillStringFormatMap();

    StringFormatMap::iterator it = stringFormatMap.find(formatName);

    if(it == stringFormatMap.end())
        return FORMAT_UNKNOWN;

    return it->second;
}


std::string
PixelFormat::FormatToString(PIXEL_FORMAT format)
{
    if(format>=0 && format<FORMAT_UNKNOWN)
        return formatNames[format];

    return formatNames[FORMAT_UNKNOWN];
}


int
PixelFormat::getBitsPerPixel(PIXEL_FORMAT format)
{
    switch(format)
    {
    case FORMAT_R8G8B8X8:
    case FORMAT_B8G8R8X8:
        return 32;

    case FORMAT_R8G8B8:
    case FORMAT_B8G8R8:
        return 24;

    case FORMAT_R5G6B5:
        return 16;

    case FORMAT_L8:
        return 8;

    default:
        return 0;
    }
}


PIXEL_FORMAT
PixelFormat::fromOGL(int format)
{
    switch(format)
    {
    case GL_RGB:
        return FORMAT_R8G8B8;
    case GL_BGR:
        return FORMAT_B8G8R8;
    case GL_RGBA:
        return FORMAT_R8G8B8X8;
    case GL_BGRA:
        return FORMAT_B8G8R8X8;
    case GL_LUMINANCE:
        return FORMAT_L8;
    default:
        return FORMAT_UNKNOWN;
    }
}


bool
PixelFormat::toOGL(PIXEL_FORMAT format, unsigned int& oglFormat, int& oglInternalFormat)
{
    switch(format)
    {
    case FORMAT_R8G8B8:
        oglFormat=GL_RGB;
        oglInternalFormat=3;
        return true;

    case FORMAT_B8G8R8:
        oglFormat=GL_BGR_EXT;
        oglInternalFormat=3;
        return true;

    case FORMAT_R8G8B8X8:
        oglFormat=GL_RGBA;
        oglInternalFormat=4;
        return true;

    case FORMAT_B8G8R8X8:
        oglFormat=GL_BGRA_EXT;
        oglInternalFormat=4;
        return true;

    case FORMAT_L8:
        oglFormat=GL_LUMINANCE;
        oglInternalFormat=GL_LUMINANCE8;
        return true;
    }

    return false;
}


}  // namespace openvideo

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