385 lines
14 KiB
C++
385 lines
14 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2011 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/image_data.hpp>
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#include <mapnik/image_scaling.hpp>
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// does not handle alpha correctly
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//#include <mapnik/span_image_filter.hpp>
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// boost
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#include <boost/assign/list_of.hpp>
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#include <boost/bimap.hpp>
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// agg
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#include "agg_image_accessors.h"
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#include "agg_pixfmt_rgba.h"
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#include "agg_color_rgba.h"
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#include "agg_rasterizer_scanline_aa.h"
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#include "agg_renderer_scanline.h"
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#include "agg_rendering_buffer.h"
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#include "agg_scanline_u.h"
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#include "agg_span_allocator.h"
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#include "agg_span_image_filter_rgba.h"
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#include "agg_span_interpolator_linear.h"
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#include "agg_trans_affine.h"
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#include "agg_image_filters.h"
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namespace mapnik
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{
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typedef boost::bimap<scaling_method_e, std::string> scaling_method_lookup_type;
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static const scaling_method_lookup_type scaling_lookup = boost::assign::list_of<scaling_method_lookup_type::relation>
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(SCALING_NEAR,"near")
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(SCALING_BILINEAR,"bilinear")
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(SCALING_BICUBIC,"bicubic")
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(SCALING_SPLINE16,"spline16")
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(SCALING_SPLINE36,"spline36")
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(SCALING_HANNING,"hanning")
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(SCALING_HAMMING,"hamming")
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(SCALING_HERMITE,"hermite")
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(SCALING_KAISER,"kaiser")
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(SCALING_QUADRIC,"quadric")
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(SCALING_CATROM,"catrom")
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(SCALING_GAUSSIAN,"gaussian")
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(SCALING_BESSEL,"bessel")
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(SCALING_MITCHELL,"mitchell")
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(SCALING_SINC,"sinc")
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(SCALING_LANCZOS,"lanczos")
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(SCALING_BLACKMAN,"blackman")
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(SCALING_BILINEAR8,"bilinear8")
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;
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boost::optional<scaling_method_e> scaling_method_from_string(std::string const& name)
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{
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boost::optional<scaling_method_e> mode;
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scaling_method_lookup_type::right_const_iterator right_iter = scaling_lookup.right.find(name);
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if (right_iter != scaling_lookup.right.end())
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{
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mode.reset(right_iter->second);
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}
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return mode;
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}
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boost::optional<std::string> scaling_method_to_string(scaling_method_e scaling_method)
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{
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boost::optional<std::string> mode;
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scaling_method_lookup_type::left_const_iterator left_iter = scaling_lookup.left.find(scaling_method);
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if (left_iter != scaling_lookup.left.end())
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{
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mode.reset(left_iter->second);
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}
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return mode;
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}
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// this has been replaced by agg impl - see https://github.com/mapnik/mapnik/issues/656
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template <typename Image>
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void scale_image_bilinear_old (Image & target,Image const& source, double x_off_f, double y_off_f)
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{
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int source_width=source.width();
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int source_height=source.height();
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int target_width=target.width();
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int target_height=target.height();
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if (source_width<1 || source_height<1 ||
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target_width<1 || target_height<1) return;
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int x=0,y=0,xs=0,ys=0;
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int tw2 = target_width/2;
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int th2 = target_height/2;
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int offs_x = rint((source_width-target_width-x_off_f*2*source_width)/2);
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int offs_y = rint((source_height-target_height-y_off_f*2*source_height)/2);
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unsigned yprt, yprt1, xprt, xprt1;
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//no scaling or subpixel offset
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if (target_height == source_height && target_width == source_width && offs_x == 0 && offs_y == 0){
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for (y=0;y<target_height;++y)
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target.setRow(y,source.getRow(y),target_width);
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return;
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}
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for (y=0;y<target_height;++y)
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{
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ys = (y*source_height+offs_y)/target_height;
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int ys1 = ys+1;
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if (ys1>=source_height)
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ys1--;
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if (ys<0)
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ys=ys1=0;
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if (source_height/2<target_height)
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yprt = (y*source_height+offs_y)%target_height;
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else
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yprt = th2;
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yprt1 = target_height-yprt;
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for (x=0;x<target_width;++x)
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{
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xs = (x*source_width+offs_x)/target_width;
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if (source_width/2<target_width)
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xprt = (x*source_width+offs_x)%target_width;
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else
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xprt = tw2;
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xprt1 = target_width-xprt;
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int xs1 = xs+1;
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if (xs1>=source_width)
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xs1--;
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if (xs<0)
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xs=xs1=0;
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unsigned a = source(xs,ys);
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unsigned b = source(xs1,ys);
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unsigned c = source(xs,ys1);
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unsigned d = source(xs1,ys1);
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unsigned out=0;
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unsigned t = 0;
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for(int i=0; i<4; i++){
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unsigned p,r,s;
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// X axis
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p = a&0xff;
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r = b&0xff;
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if (p!=r)
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r = (r*xprt+p*xprt1+tw2)/target_width;
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p = c&0xff;
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s = d&0xff;
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if (p!=s)
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s = (s*xprt+p*xprt1+tw2)/target_width;
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// Y axis
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if (r!=s)
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r = (s*yprt+r*yprt1+th2)/target_height;
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// channel up
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out |= r << t;
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t += 8;
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a >>= 8;
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b >>= 8;
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c >>= 8;
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d >>= 8;
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}
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target(x,y)=out;
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}
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}
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}
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template <typename Image>
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void scale_image_bilinear8 (Image & target,Image const& source, double x_off_f, double y_off_f)
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{
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int source_width=source.width();
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int source_height=source.height();
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int target_width=target.width();
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int target_height=target.height();
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if (source_width<1 || source_height<1 ||
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target_width<1 || target_height<1) return;
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int x=0,y=0,xs=0,ys=0;
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int tw2 = target_width/2;
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int th2 = target_height/2;
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int offs_x = rint((source_width-target_width-x_off_f*2*source_width)/2);
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int offs_y = rint((source_height-target_height-y_off_f*2*source_height)/2);
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unsigned yprt, yprt1, xprt, xprt1;
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//no scaling or subpixel offset
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if (target_height == source_height && target_width == source_width && offs_x == 0 && offs_y == 0){
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for (y=0;y<target_height;++y)
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target.setRow(y,source.getRow(y),target_width);
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return;
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}
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for (y=0;y<target_height;++y)
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{
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ys = (y*source_height+offs_y)/target_height;
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int ys1 = ys+1;
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if (ys1>=source_height)
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ys1--;
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if (ys<0)
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ys=ys1=0;
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if (source_height/2<target_height)
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yprt = (y*source_height+offs_y)%target_height;
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else
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yprt = th2;
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yprt1 = target_height-yprt;
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for (x=0;x<target_width;++x)
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{
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xs = (x*source_width+offs_x)/target_width;
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if (source_width/2<target_width)
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xprt = (x*source_width+offs_x)%target_width;
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else
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xprt = tw2;
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xprt1 = target_width-xprt;
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int xs1 = xs+1;
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if (xs1>=source_width)
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xs1--;
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if (xs<0)
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xs=xs1=0;
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unsigned a = source(xs,ys);
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unsigned b = source(xs1,ys);
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unsigned c = source(xs,ys1);
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unsigned d = source(xs1,ys1);
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unsigned p,r,s;
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// X axis
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p = a&0xff;
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r = b&0xff;
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if (p!=r)
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r = (r*xprt+p*xprt1+tw2)/target_width;
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p = c&0xff;
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s = d&0xff;
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if (p!=s)
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s = (s*xprt+p*xprt1+tw2)/target_width;
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// Y axis
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if (r!=s)
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r = (s*yprt+r*yprt1+th2)/target_height;
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target(x,y)=(0xff<<24) | (r<<16) | (r<<8) | r;
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}
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}
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}
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template <typename Image>
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void scale_image_agg(Image & target,
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Image const& source,
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scaling_method_e scaling_method,
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double image_ratio_x,
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double image_ratio_y,
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double x_off_f,
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double y_off_f,
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double filter_factor)
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{
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// "the image filters should work namely in the premultiplied color space"
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// http://old.nabble.com/Re:--AGG--Basic-image-transformations-p1110665.html
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// "Yes, you need to use premultiplied images only. Only in this case the simple weighted averaging works correctly in the image fitering."
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// http://permalink.gmane.org/gmane.comp.graphics.agg/3443
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typedef agg::pixfmt_rgba32_pre pixfmt_pre;
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typedef agg::renderer_base<pixfmt_pre> renderer_base_pre;
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// define some stuff we'll use soon
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agg::rasterizer_scanline_aa<> ras;
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agg::scanline_u8 sl;
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agg::span_allocator<agg::rgba8> sa;
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agg::image_filter_lut filter;
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// initialize source AGG buffer
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agg::rendering_buffer rbuf_src((unsigned char*)source.getBytes(), source.width(), source.height(), source.width() * 4);
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pixfmt_pre pixf_src(rbuf_src);
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typedef agg::image_accessor_clone<pixfmt_pre> img_src_type;
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img_src_type img_src(pixf_src);
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// initialize destination AGG buffer (with transparency)
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agg::rendering_buffer rbuf_dst((unsigned char*)target.getBytes(), target.width(), target.height(), target.width() * 4);
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pixfmt_pre pixf_dst(rbuf_dst);
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renderer_base_pre rb_dst_pre(pixf_dst);
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rb_dst_pre.clear(agg::rgba(0, 0, 0, 0));
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// create a scaling matrix
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agg::trans_affine img_mtx;
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img_mtx /= agg::trans_affine_scaling(image_ratio_x, image_ratio_y);
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// create a linear interpolator for our scaling matrix
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typedef agg::span_interpolator_linear<> interpolator_type;
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interpolator_type interpolator(img_mtx);
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// draw an anticlockwise polygon to render our image into
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double scaled_width = target.width();
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double scaled_height = target.height();
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ras.reset();
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ras.move_to_d(x_off_f, y_off_f);
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ras.line_to_d(x_off_f + scaled_width, y_off_f);
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ras.line_to_d(x_off_f + scaled_width, y_off_f + scaled_height);
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ras.line_to_d(x_off_f, y_off_f + scaled_height);
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switch(scaling_method)
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{
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case SCALING_NEAR:
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{
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typedef agg::span_image_filter_rgba_nn<img_src_type, interpolator_type> span_gen_type;
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span_gen_type sg(img_src, interpolator);
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agg::render_scanlines_aa(ras, sl, rb_dst_pre, sa, sg);
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return;
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}
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case SCALING_BILINEAR:
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case SCALING_BILINEAR8:
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filter.calculate(agg::image_filter_bilinear(), true); break;
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case SCALING_BICUBIC:
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filter.calculate(agg::image_filter_bicubic(), true); break;
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case SCALING_SPLINE16:
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filter.calculate(agg::image_filter_spline16(), true); break;
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case SCALING_SPLINE36:
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filter.calculate(agg::image_filter_spline36(), true); break;
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case SCALING_HANNING:
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filter.calculate(agg::image_filter_hanning(), true); break;
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case SCALING_HAMMING:
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filter.calculate(agg::image_filter_hamming(), true); break;
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case SCALING_HERMITE:
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filter.calculate(agg::image_filter_hermite(), true); break;
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case SCALING_KAISER:
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filter.calculate(agg::image_filter_kaiser(), true); break;
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case SCALING_QUADRIC:
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filter.calculate(agg::image_filter_quadric(), true); break;
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case SCALING_CATROM:
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filter.calculate(agg::image_filter_catrom(), true); break;
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case SCALING_GAUSSIAN:
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filter.calculate(agg::image_filter_gaussian(), true); break;
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case SCALING_BESSEL:
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filter.calculate(agg::image_filter_bessel(), true); break;
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case SCALING_MITCHELL:
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filter.calculate(agg::image_filter_mitchell(), true); break;
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case SCALING_SINC:
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filter.calculate(agg::image_filter_sinc(filter_factor), true); break;
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case SCALING_LANCZOS:
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filter.calculate(agg::image_filter_lanczos(filter_factor), true); break;
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case SCALING_BLACKMAN:
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filter.calculate(agg::image_filter_blackman(filter_factor), true); break;
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}
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// details on various resampling considerations
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// http://old.nabble.com/Re%3A-Newbie---texture-p5057255.html
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// high quality resampler
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typedef agg::span_image_resample_rgba_affine<img_src_type> span_gen_type;
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// faster, lower quality
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//typedef agg::span_image_filter_rgba<img_src_type,interpolator_type> span_gen_type;
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// local, modified agg::span_image_resample_rgba_affine
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// dating back to when we were not handling alpha correctly
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// and this file helped work around symptoms
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// https://github.com/mapnik/mapnik/issues/1489
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//typedef mapnik::span_image_resample_rgba_affine<img_src_type> span_gen_type;
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span_gen_type sg(img_src, interpolator, filter);
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agg::render_scanlines_aa(ras, sl, rb_dst_pre, sa, sg);
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}
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template void scale_image_agg<image_data_32>(image_data_32& target,
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const image_data_32& source,
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scaling_method_e scaling_method,
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double image_ratio_x,
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double image_ratio_y,
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double x_off_f,
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double y_off_f,
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double filter_factor);
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template void scale_image_bilinear_old<image_data_32> (image_data_32& target,const image_data_32& source, double x_off_f, double y_off_f);
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template void scale_image_bilinear8<image_data_32> (image_data_32& target,const image_data_32& source, double x_off_f, double y_off_f);
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}
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