303 lines
9.4 KiB
C++
303 lines
9.4 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) 2014 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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#ifndef MAPNIK_GRAPHICS_HPP
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#define MAPNIK_GRAPHICS_HPP
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// mapnik
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#include <mapnik/config.hpp>
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#include <mapnik/color.hpp>
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#include <mapnik/image_data.hpp>
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#include <mapnik/box2d.hpp>
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#include <mapnik/image_view.hpp>
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#include <mapnik/global.hpp>
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// stl
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#include <algorithm>
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#include <string>
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#include <memory>
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// boost
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#include <boost/optional/optional.hpp>
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namespace mapnik
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{
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class MAPNIK_DECL image_32
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{
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private:
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image_data_rgba8 data_;
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boost::optional<color> background_;
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bool painted_;
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bool premultiplied_;
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public:
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image_32(int width,int height);
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image_32(image_32 const& rhs);
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~image_32();
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void painted(bool painted)
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{
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painted_ = painted;
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}
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bool painted() const
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{
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return painted_;
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}
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bool premultiplied() const
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{
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return premultiplied_;
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}
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inline void clear()
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{
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std::fill(data_.getData(), data_.getData() + data_.width() * data_.height(), 0);
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}
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boost::optional<color> const& get_background() const;
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void set_background(const color& c);
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void premultiply();
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void demultiply();
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void set_grayscale_to_alpha();
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void set_color_to_alpha(color const& c);
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void set_alpha(float opacity);
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inline const image_data_rgba8& data() const
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{
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return data_;
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}
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inline image_data_rgba8& data()
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{
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return data_;
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}
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inline const unsigned char* raw_data() const
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{
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return data_.getBytes();
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}
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inline unsigned char* raw_data()
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{
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return data_.getBytes();
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}
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inline image_view<image_data_rgba8> get_view(unsigned x,unsigned y, unsigned w,unsigned h)
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{
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return image_view<image_data_rgba8>(x,y,w,h,data_);
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}
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private:
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inline bool checkBounds(int x, int y) const
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{
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return (x >= 0 && x < static_cast<int>(data_.width()) && y >= 0 && y < static_cast<int>(data_.height()));
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}
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public:
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inline void setPixel(int x,int y,unsigned int rgba)
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{
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if (checkBounds(x,y))
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{
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data_(x,y)=rgba;
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}
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}
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void composite_pixel(unsigned op, int x,int y,unsigned c, unsigned cover, double opacity);
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inline unsigned width() const
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{
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return data_.width();
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}
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inline unsigned height() const
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{
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return data_.height();
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}
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inline void set_rectangle(int x0,int y0,image_data_rgba8 const& data)
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{
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box2d<int> ext0(0,0,data_.width(),data_.height());
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box2d<int> ext1(x0,y0,x0+data.width(),y0+data.height());
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if (ext0.intersects(ext1))
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{
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box2d<int> box = ext0.intersect(ext1);
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for (int y = box.miny(); y < box.maxy(); ++y)
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{
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unsigned int* row_to = data_.getRow(y);
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unsigned int const * row_from = data.getRow(y-y0);
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for (int x = box.minx(); x < box.maxx(); ++x)
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{
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if (row_from[x-x0] & 0xff000000)
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{
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row_to[x] = row_from[x-x0];
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}
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}
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}
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}
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}
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inline void set_rectangle_alpha(int x0,int y0,const image_data_rgba8& data)
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{
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box2d<int> ext0(0,0,data_.width(),data_.height());
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box2d<int> ext1(x0,y0,x0 + data.width(),y0 + data.height());
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if (ext0.intersects(ext1))
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{
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box2d<int> box = ext0.intersect(ext1);
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for (int y = box.miny(); y < box.maxy(); ++y)
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{
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unsigned int* row_to = data_.getRow(y);
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unsigned int const * row_from = data.getRow(y-y0);
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for (int x = box.minx(); x < box.maxx(); ++x)
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{
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unsigned rgba0 = row_to[x];
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unsigned rgba1 = row_from[x-x0];
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unsigned a1 = (rgba1 >> 24) & 0xff;
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if (a1 == 0) continue;
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if (a1 == 0xff)
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{
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row_to[x] = rgba1;
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continue;
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}
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unsigned r1 = rgba1 & 0xff;
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unsigned g1 = (rgba1 >> 8 ) & 0xff;
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unsigned b1 = (rgba1 >> 16) & 0xff;
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unsigned a0 = (rgba0 >> 24) & 0xff;
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unsigned r0 = (rgba0 & 0xff) * a0;
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unsigned g0 = ((rgba0 >> 8 ) & 0xff) * a0;
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unsigned b0 = ((rgba0 >> 16) & 0xff) * a0;
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a0 = ((a1 + a0) << 8) - a0*a1;
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r0 = ((((r1 << 8) - r0) * a1 + (r0 << 8)) / a0);
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g0 = ((((g1 << 8) - g0) * a1 + (g0 << 8)) / a0);
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b0 = ((((b1 << 8) - b0) * a1 + (b0 << 8)) / a0);
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a0 = a0 >> 8;
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row_to[x] = (a0 << 24)| (b0 << 16) | (g0 << 8) | (r0) ;
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}
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}
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}
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}
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inline void set_rectangle_alpha2(image_data_rgba8 const& data, unsigned x0, unsigned y0, float opacity)
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{
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box2d<int> ext0(0,0,data_.width(),data_.height());
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box2d<int> ext1(x0,y0,x0 + data.width(),y0 + data.height());
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if (ext0.intersects(ext1))
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{
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box2d<int> box = ext0.intersect(ext1);
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for (int y = box.miny(); y < box.maxy(); ++y)
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{
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unsigned int* row_to = data_.getRow(y);
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unsigned int const * row_from = data.getRow(y-y0);
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for (int x = box.minx(); x < box.maxx(); ++x)
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{
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unsigned rgba0 = row_to[x];
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unsigned rgba1 = row_from[x-x0];
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unsigned a1 = int( ((rgba1 >> 24) & 0xff) * opacity );
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if (a1 == 0) continue;
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if (a1 == 0xff)
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{
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row_to[x] = rgba1;
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continue;
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}
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unsigned r1 = rgba1 & 0xff;
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unsigned g1 = (rgba1 >> 8 ) & 0xff;
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unsigned b1 = (rgba1 >> 16) & 0xff;
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unsigned a0 = (rgba0 >> 24) & 0xff;
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unsigned r0 = rgba0 & 0xff ;
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unsigned g0 = (rgba0 >> 8 ) & 0xff;
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unsigned b0 = (rgba0 >> 16) & 0xff;
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unsigned atmp = a1 + a0 - ((a1 * a0 + 255) >> 8);
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if (atmp)
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{
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r0 = byte((r1 * a1 + (r0 * a0) - ((r0 * a0 * a1 + 255) >> 8)) / atmp);
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g0 = byte((g1 * a1 + (g0 * a0) - ((g0 * a0 * a1 + 255) >> 8)) / atmp);
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b0 = byte((b1 * a1 + (b0 * a0) - ((b0 * a0 * a1 + 255) >> 8)) / atmp);
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}
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a0 = byte(atmp);
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row_to[x] = (a0 << 24)| (b0 << 16) | (g0 << 8) | (r0) ;
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}
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}
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}
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}
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template <typename MergeMethod>
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inline void merge_rectangle(image_data_rgba8 const& data, unsigned x0, unsigned y0, float opacity)
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{
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box2d<int> ext0(0,0,data_.width(),data_.height());
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box2d<int> ext1(x0,y0,x0 + data.width(),y0 + data.height());
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if (ext0.intersects(ext1))
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{
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box2d<int> box = ext0.intersect(ext1);
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for (int y = box.miny(); y < box.maxy(); ++y)
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{
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unsigned int* row_to = data_.getRow(y);
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unsigned int const * row_from = data.getRow(y-y0);
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for (int x = box.minx(); x < box.maxx(); ++x)
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{
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unsigned rgba0 = row_to[x];
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unsigned rgba1 = row_from[x-x0];
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unsigned a1 = int( ((rgba1 >> 24) & 0xff) * opacity );
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if (a1 == 0) continue;
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unsigned r1 = rgba1 & 0xff;
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unsigned g1 = (rgba1 >> 8 ) & 0xff;
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unsigned b1 = (rgba1 >> 16) & 0xff;
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unsigned a0 = (rgba0 >> 24) & 0xff;
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unsigned r0 = rgba0 & 0xff ;
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unsigned g0 = (rgba0 >> 8 ) & 0xff;
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unsigned b0 = (rgba0 >> 16) & 0xff;
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unsigned a = (a1 * 255 + (255 - a1) * a0 + 127)/255;
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MergeMethod::mergeRGB(r0,g0,b0,r1,g1,b1);
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r0 = (r1*a1 + (((255 - a1) * a0 + 127)/255) * r0 + 127)/a;
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g0 = (g1*a1 + (((255 - a1) * a0 + 127)/255) * g0 + 127)/a;
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b0 = (b1*a1 + (((255 - a1) * a0 + 127)/255) * b0 + 127)/a;
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row_to[x] = (a << 24)| (b0 << 16) | (g0 << 8) | (r0) ;
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}
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}
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}
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}
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};
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}
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#endif // MAPNIK_GRAPHICS_HPP
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