/usr/include/mapnik/image_compositing.hpp is in libmapnik2-dev 2.0.0+ds1-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 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
*
*****************************************************************************/
//$Id$
#ifndef IMAGE_COMPOSITING_HPP
#define IMAGE_COMPOSITING_HPP
// agg
#include "agg_rendering_buffer.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_scanline_u.h"
#include "agg_renderer_scanline.h"
#include "agg_pixfmt_rgba.h"
namespace mapnik
{
// Compositing modes
// http://www.w3.org/TR/2009/WD-SVGCompositing-20090430/
enum composite_mode_e
{
clear = 1,
src,
dst,
src_over,
dst_over,
src_in,
dst_in,
src_out,
dst_out,
src_atop,
dst_atop,
_xor,
plus,
minus,
multiply,
screen,
overlay,
darken,
lighten,
color_dodge,
color_burn,
hard_light,
soft_light,
difference,
exclusion,
contrast,
invert,
invert_rgb
};
template <typename T1, typename T2>
void composite(T1 & im, T2 & im2, composite_mode_e mode)
{
typedef agg::rgba8 color;
typedef agg::order_bgra order;
typedef agg::pixel32_type pixel_type;
typedef agg::comp_op_adaptor_rgba<color, order> blender_type;
typedef agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer> pixfmt_type;
typedef agg::renderer_base<pixfmt_type> renderer_type;
typedef agg::comp_op_adaptor_rgba<color, order> blender_type;
typedef agg::renderer_base<pixfmt_type> renderer_type;
agg::rendering_buffer source(im.getBytes(),im.width(),im.height(),im.width() * 4);
agg::rendering_buffer mask(im2.getBytes(),im2.width(),im2.height(),im2.width() * 4);
agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer> pixf(source);
agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer> pixf_mask(mask);
switch(mode)
{
case clear :
pixf.comp_op(agg::comp_op_clear);
break;
case src:
pixf.comp_op(agg::comp_op_src);
break;
case dst:
pixf.comp_op(agg::comp_op_dst);
break;
case src_over:
pixf.comp_op(agg::comp_op_src_over);
break;
case dst_over:
pixf.comp_op(agg::comp_op_dst_over);
break;
case src_in:
pixf.comp_op(agg::comp_op_src_in);
break;
case dst_in:
pixf.comp_op(agg::comp_op_dst_in);
break;
case src_out:
pixf.comp_op(agg::comp_op_src_out);
break;
case dst_out:
pixf.comp_op(agg::comp_op_dst_out);
break;
case src_atop:
pixf.comp_op(agg::comp_op_src_atop);
break;
case dst_atop:
pixf.comp_op(agg::comp_op_dst_atop);
break;
case _xor:
pixf.comp_op(agg::comp_op_xor);
break;
case plus:
pixf.comp_op(agg::comp_op_plus);
break;
case minus:
pixf.comp_op(agg::comp_op_minus);
break;
case multiply:
pixf.comp_op(agg::comp_op_multiply);
break;
case screen:
pixf.comp_op(agg::comp_op_screen);
break;
case overlay:
pixf.comp_op(agg::comp_op_overlay);
break;
case darken:
pixf.comp_op(agg::comp_op_darken);
break;
case lighten:
pixf.comp_op(agg::comp_op_lighten);
break;
case color_dodge:
pixf.comp_op(agg::comp_op_color_dodge);
break;
case color_burn:
pixf.comp_op(agg::comp_op_color_burn);
break;
case hard_light:
pixf.comp_op(agg::comp_op_hard_light);
break;
case soft_light:
pixf.comp_op(agg::comp_op_soft_light);
break;
case difference:
pixf.comp_op(agg::comp_op_difference);
break;
case exclusion:
pixf.comp_op(agg::comp_op_exclusion);
break;
case contrast:
pixf.comp_op(agg::comp_op_contrast);
break;
case invert:
pixf.comp_op(agg::comp_op_invert);
break;
case invert_rgb:
pixf.comp_op(agg::comp_op_invert_rgb);
break;
default:
break;
}
renderer_type ren(pixf);
agg::renderer_base<pixfmt_type> rb(pixf);
rb.blend_from(pixf_mask,0,0,0,255);
}
}
#endif // IMAGE_COMPOSITING_HPP
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