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/*****************************************************************************
*
* 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>
#include <mapnik/global.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() {}
void image_32::set_grayscale_to_alpha()
{
for (int y = 0; y < height_; ++y)
{
unsigned int* row_from = data_.getRow(y);
for (int x = 0; x < width_; ++x)
{
unsigned rgba = row_from[x];
unsigned r = rgba & 0xff;
unsigned g = (rgba >> 8 ) & 0xff;
unsigned b = (rgba >> 16) & 0xff;
// magic numbers for grayscale
unsigned a = (int)((r * .3) + (g * .59) + (b * .11));
row_from[x] = (a << 24)| (255 << 16) | (255 << 8) | (255) ;
}
}
}
void image_32::set_color_to_alpha(const color& c)
{
}
void image_32::set_alpha(float opacity)
{
{
for (int y = 0; y < height_; ++y)
{
unsigned int* row_to = data_.getRow(y);
for (int x = 0; x < width_; ++x)
{
unsigned rgba = row_to[x];
#ifdef MAPNIK_BIG_ENDIAN
unsigned a0 = (rgba & 0xff);
unsigned a1 = int( (rgba & 0xff) * opacity );
if (a0 == a1) continue;
unsigned r = (rgba >> 24) & 0xff;
unsigned g = (rgba >> 16 ) & 0xff;
unsigned b = (rgba >> 8) & 0xff;
row_to[x] = (a1) | (b << 8) | (g << 16) | (r << 24) ;
#else
unsigned a0 = (rgba >> 24) & 0xff;
unsigned a1 = int( ((rgba >> 24) & 0xff) * opacity );
//unsigned a1 = opacity;
if (a0 == a1) continue;
unsigned r = rgba & 0xff;
unsigned g = (rgba >> 8 ) & 0xff;
unsigned b = (rgba >> 16) & 0xff;
row_to[x] = (a1 << 24)| (b << 16) | (g << 8) | (r) ;
#endif
}
}
}
}
void image_32::set_background(const color& background)
{
background_=background;
data_.set(background_.rgba());
}
const color& image_32::get_background() const
{
return background_;
}
}
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