180 lines
7 KiB
C++
180 lines
7 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2014 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
|
|
*
|
|
*****************************************************************************/
|
|
|
|
// mapnik
|
|
#include <mapnik/image.hpp>
|
|
#include <mapnik/image_scaling.hpp>
|
|
#include <mapnik/image_scaling_traits.hpp>
|
|
// does not handle alpha correctly
|
|
//#include <mapnik/span_image_filter.hpp>
|
|
|
|
// boost
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wunused-local-typedef"
|
|
#pragma GCC diagnostic ignored "-Wredeclared-class-member"
|
|
#include <boost/assign/list_of.hpp>
|
|
#include <boost/bimap.hpp>
|
|
#pragma GCC diagnostic pop
|
|
|
|
// agg
|
|
#include "agg_image_accessors.h"
|
|
#include "agg_pixfmt_rgba.h"
|
|
#include "agg_pixfmt_gray.h"
|
|
#include "agg_color_rgba.h"
|
|
#include "agg_rasterizer_scanline_aa.h"
|
|
#include "agg_renderer_scanline.h"
|
|
#include "agg_rendering_buffer.h"
|
|
#include "agg_scanline_u.h"
|
|
#include "agg_span_allocator.h"
|
|
#include "agg_span_image_filter_gray.h"
|
|
#include "agg_span_image_filter_rgba.h"
|
|
#include "agg_span_interpolator_linear.h"
|
|
#include "agg_trans_affine.h"
|
|
#include "agg_image_filters.h"
|
|
|
|
namespace mapnik
|
|
{
|
|
|
|
using scaling_method_lookup_type = boost::bimap<scaling_method_e, std::string>;
|
|
static const scaling_method_lookup_type scaling_lookup = boost::assign::list_of<scaling_method_lookup_type::relation>
|
|
(SCALING_NEAR,"near")
|
|
(SCALING_BILINEAR,"bilinear")
|
|
(SCALING_BICUBIC,"bicubic")
|
|
(SCALING_SPLINE16,"spline16")
|
|
(SCALING_SPLINE36,"spline36")
|
|
(SCALING_HANNING,"hanning")
|
|
(SCALING_HAMMING,"hamming")
|
|
(SCALING_HERMITE,"hermite")
|
|
(SCALING_KAISER,"kaiser")
|
|
(SCALING_QUADRIC,"quadric")
|
|
(SCALING_CATROM,"catrom")
|
|
(SCALING_GAUSSIAN,"gaussian")
|
|
(SCALING_BESSEL,"bessel")
|
|
(SCALING_MITCHELL,"mitchell")
|
|
(SCALING_SINC,"sinc")
|
|
(SCALING_LANCZOS,"lanczos")
|
|
(SCALING_BLACKMAN,"blackman")
|
|
;
|
|
|
|
boost::optional<scaling_method_e> scaling_method_from_string(std::string const& name)
|
|
{
|
|
boost::optional<scaling_method_e> mode;
|
|
scaling_method_lookup_type::right_const_iterator right_iter = scaling_lookup.right.find(name);
|
|
if (right_iter != scaling_lookup.right.end())
|
|
{
|
|
mode.reset(right_iter->second);
|
|
}
|
|
return mode;
|
|
}
|
|
|
|
boost::optional<std::string> scaling_method_to_string(scaling_method_e scaling_method)
|
|
{
|
|
boost::optional<std::string> mode;
|
|
scaling_method_lookup_type::left_const_iterator left_iter = scaling_lookup.left.find(scaling_method);
|
|
if (left_iter != scaling_lookup.left.end())
|
|
{
|
|
mode.reset(left_iter->second);
|
|
}
|
|
return mode;
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
void scale_image_agg(T & target, T const& source, scaling_method_e scaling_method,
|
|
double image_ratio_x, double image_ratio_y, double x_off_f, double y_off_f,
|
|
double filter_factor)
|
|
{
|
|
// "the image filters should work namely in the premultiplied color space"
|
|
// http://old.nabble.com/Re:--AGG--Basic-image-transformations-p1110665.html
|
|
// "Yes, you need to use premultiplied images only. Only in this case the simple weighted averaging works correctly in the image fitering."
|
|
// http://permalink.gmane.org/gmane.comp.graphics.agg/3443
|
|
using image_type = T;
|
|
using pixel_type = typename image_type::pixel_type;
|
|
using pixfmt_pre = typename detail::agg_scaling_traits<image_type>::pixfmt_pre;
|
|
using color_type = typename detail::agg_scaling_traits<image_type>::color_type;
|
|
using img_src_type = typename detail::agg_scaling_traits<image_type>::img_src_type;
|
|
using interpolator_type = typename detail::agg_scaling_traits<image_type>::interpolator_type;
|
|
using renderer_base_pre = agg::renderer_base<pixfmt_pre>;
|
|
constexpr std::size_t pixel_size = sizeof(pixel_type);
|
|
|
|
// define some stuff we'll use soon
|
|
agg::rasterizer_scanline_aa<> ras;
|
|
agg::scanline_u8 sl;
|
|
agg::span_allocator<color_type> sa;
|
|
|
|
// initialize source AGG buffer
|
|
agg::rendering_buffer rbuf_src(const_cast<unsigned char*>(source.getBytes()),
|
|
source.width(), source.height(), source.width() * pixel_size);
|
|
pixfmt_pre pixf_src(rbuf_src);
|
|
|
|
img_src_type img_src(pixf_src);
|
|
|
|
// initialize destination AGG buffer (with transparency)
|
|
agg::rendering_buffer rbuf_dst(target.getBytes(), target.width(), target.height(), target.width() * pixel_size);
|
|
pixfmt_pre pixf_dst(rbuf_dst);
|
|
renderer_base_pre rb_dst_pre(pixf_dst);
|
|
|
|
// create a scaling matrix
|
|
agg::trans_affine img_mtx;
|
|
img_mtx /= agg::trans_affine_scaling(image_ratio_x, image_ratio_y);
|
|
|
|
// create a linear interpolator for our scaling matrix
|
|
interpolator_type interpolator(img_mtx);
|
|
// draw an anticlockwise polygon to render our image into
|
|
double scaled_width = target.width();
|
|
double scaled_height = target.height();
|
|
ras.reset();
|
|
ras.move_to_d(x_off_f, y_off_f);
|
|
ras.line_to_d(x_off_f + scaled_width, y_off_f);
|
|
ras.line_to_d(x_off_f + scaled_width, y_off_f + scaled_height);
|
|
ras.line_to_d(x_off_f, y_off_f + scaled_height);
|
|
|
|
if (scaling_method == SCALING_NEAR)
|
|
{
|
|
using span_gen_type = typename detail::agg_scaling_traits<image_type>::span_image_filter;
|
|
span_gen_type sg(img_src, interpolator);
|
|
agg::render_scanlines_aa(ras, sl, rb_dst_pre, sa, sg);
|
|
}
|
|
else
|
|
{
|
|
using span_gen_type = typename detail::agg_scaling_traits<image_type>::span_image_resample_affine;
|
|
agg::image_filter_lut filter;
|
|
detail::set_scaling_method(filter, scaling_method, filter_factor);
|
|
span_gen_type sg(img_src, interpolator, filter);
|
|
agg::render_scanlines_aa(ras, sl, rb_dst_pre, sa, sg);
|
|
}
|
|
|
|
}
|
|
|
|
template MAPNIK_DECL void scale_image_agg(image_rgba8 &, image_rgba8 const&, scaling_method_e,
|
|
double, double , double, double , double);
|
|
|
|
template MAPNIK_DECL void scale_image_agg(image_gray8 &, image_gray8 const&, scaling_method_e,
|
|
double, double , double, double , double);
|
|
|
|
template MAPNIK_DECL void scale_image_agg(image_gray16 &, image_gray16 const&, scaling_method_e,
|
|
double, double , double, double , double);
|
|
|
|
template MAPNIK_DECL void scale_image_agg(image_gray32f &, image_gray32f const&, scaling_method_e,
|
|
double, double , double, double , double);
|
|
|
|
}
|