/*****************************************************************************
 * 
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2006 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/
//$Id: graphics.cpp 17 2005-03-08 23:58:43Z pavlenko $

// mapnik
#include <mapnik/graphics.hpp>
#include <mapnik/image_util.hpp>

// cairo
#ifdef HAVE_CAIRO
#include <cairomm/surface.h>
#endif

#include <iostream>

namespace mapnik
{
image_32::image_32(int width,int height)
    :width_(width),
     height_(height),
     data_(width,height) {}

image_32::image_32(const image_32& rhs)
    :width_(rhs.width_),
     height_(rhs.height_),
     data_(rhs.data_)  {}

#ifdef HAVE_CAIRO
image_32::image_32(Cairo::RefPtr<Cairo::ImageSurface> rhs)
    :width_(rhs->get_width()),
     height_(rhs->get_height()),
     data_(rhs->get_width(),rhs->get_height())
{
    if (rhs->get_format() != Cairo::FORMAT_ARGB32)
    {
        std::cerr << "Unable to convert this Cairo format\n";
        return; // throw exception ??
    }

    int stride = rhs->get_stride() / 4;

    unsigned int out_row[width_];
    const unsigned int *in_row = (const unsigned int *)rhs->get_data();

    for (unsigned int row = 0; row < height_; row++, in_row += stride)
    {
        for (unsigned int column = 0; column < width_; column++)
        {
            unsigned int in = in_row[column];
            unsigned int a = (in >> 24) & 0xff;
            unsigned int r = (in >> 16) & 0xff;
            unsigned int g = (in >> 8) & 0xff;
            unsigned int b = (in >> 0) & 0xff;

#define DE_ALPHA(x) do {                        \
                if (a == 0) x = 0;              \
                else x = x * 255 / a;           \
                if (x > 255) x = 255;           \
            } while(0)
                   
            DE_ALPHA(r);
            DE_ALPHA(g);
            DE_ALPHA(b);

            out_row[column] = color(r, g, b, a).rgba();
        }
        data_.setRow(row, out_row, width_);
    }
}
#endif

image_32::~image_32() {}

const image_data_32& image_32::data() const
{
    return data_;
}

void image_32::set_background(const color& background)
{
    background_=background;
    data_.set(background_.rgba());
}

const color& image_32::get_background() const
{
    return background_;
}
}