508 lines
17 KiB
C++
508 lines
17 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) 2006 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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//$Id: graphics.hpp 39 2005-04-10 20:39:53Z pavlenko $
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#ifndef GRAPHICS_HPP
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#define GRAPHICS_HPP
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// mapnik
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#include <mapnik/color.hpp>
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#include <mapnik/gamma.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 <cmath>
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#include <string>
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#include <cassert>
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// cairo
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#ifdef HAVE_CAIRO
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#include <cairomm/surface.h>
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#endif
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namespace mapnik
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{
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struct Multiply
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{
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inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0,
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unsigned &r1, unsigned &g1, unsigned &b1)
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{
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r1 = r1*r0/255;
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g1 = g1*g0/255;
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b1 = b1*b0/255;
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}
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};
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struct Multiply2
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{
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inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0,
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unsigned &r1, unsigned &g1, unsigned &b1)
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{
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r1 = r1*r0/128;
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if (r1>255) r1=255;
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g1 = g1*g0/128;
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if (g1>255) g1=255;
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b1 = b1*b0/128;
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if (b1>255) b1=255;
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}
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};
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struct Divide
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{
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inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0,
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unsigned &r1, unsigned &g1, unsigned &b1)
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{
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r1 = r0*256/(r1+1);
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g1 = g0*256/(g1+1);
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b1 = b0*256/(b1+1);
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}
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};
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struct Divide2
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{
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inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0,
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unsigned &r1, unsigned &g1, unsigned &b1)
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{
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r1 = r0*128/(r1+1);
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g1 = g0*128/(g1+1);
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b1 = b0*128/(b1+1);
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}
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};
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struct Screen
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{
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inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0,
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unsigned &r1, unsigned &g1, unsigned &b1)
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{
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r1 = 255 - (255-r0)*(255-r1)/255;
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g1 = 255 - (255-g0)*(255-g1)/255;
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b1 = 255 - (255-b0)*(255-b1)/255;
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}
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};
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struct HardLight
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{
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inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0,
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unsigned &r1, unsigned &g1, unsigned &b1)
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{
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r1 = (r1>128)?255-(255-r0)*(255-2*(r1-128))/256:r0*r1*2/256;
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g1 = (g1>128)?255-(255-g0)*(255-2*(g1-128))/256:g0*g1*2/256;
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b1 = (b1>128)?255-(255-b0)*(255-2*(b1-128))/256:b0*b1*2/256;
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}
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};
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struct MergeGrain
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{
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inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0,
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unsigned &r1, unsigned &g1, unsigned &b1)
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{
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r1 = (r1+r0>128)?r1+r0-128:0;
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if (r1>255) r1=255;
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g1 = (g1+g0>128)?g1+g0-128:0;
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if (g1>255) g1=255;
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b1 = (b1+b0>128)?b1+b0-128:0;
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if (b1>255) b1=255;
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}
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};
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struct MergeGrain2
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{
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inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0,
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unsigned &r1, unsigned &g1, unsigned &b1)
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{
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r1 = (2*r1+r0>256)?2*r1+r0-256:0;
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if (r1>255) r1=255;
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g1 = (2*g1+g0>256)?2*g1+g0-256:0;
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if (g1>255) g1=255;
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b1 = (2*b1+b0>256)?2*b1+b0-256:0;
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if (b1>255) b1=255;
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}
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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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unsigned width_;
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unsigned height_;
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color background_;
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image_data_32 data_;
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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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#ifdef HAVE_CAIRO
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image_32(Cairo::RefPtr<Cairo::ImageSurface> rhs);
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#endif
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~image_32();
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void set_background(color const& background);
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const color& get_background() const;
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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_32& data() const
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{
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return data_;
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}
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inline image_data_32& 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_32> get_view(unsigned x,unsigned y, unsigned w,unsigned h)
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{
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return image_view<image_data_32>(x,y,w,h,data_);
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}
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private:
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inline bool checkBounds(unsigned x, unsigned y) const
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{
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return (x < width_ && y < 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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inline void blendPixel(int x,int y,unsigned int rgba1,int t)
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{
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blendPixel2(x,y,rgba1,t,1.0); // do not change opacity
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}
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inline void blendPixel2(int x,int y,unsigned int rgba1,int t,double opacity)
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{
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if (checkBounds(x,y))
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{
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unsigned rgba0 = data_(x,y);
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#ifdef MAPNIK_BIG_ENDIAN
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unsigned a1 = (int)((rgba1 & 0xff) * opacity) & 0xff; // adjust for desired opacity
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a1 = (t*a1) / 255;
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if (a1 == 0) return;
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unsigned r1 = (rgba1 >> 24) & 0xff;
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unsigned g1 = (rgba1 >> 16 ) & 0xff;
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unsigned b1 = (rgba1 >> 8) & 0xff;
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unsigned a0 = (rgba0 & 0xff);
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unsigned r0 = ((rgba0 >> 24 ) & 0xff) * a0;
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unsigned g0 = ((rgba0 >> 16 ) & 0xff) * a0;
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unsigned b0 = ((rgba0 >> 8) & 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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data_(x,y)= (a0)| (b0 << 8) | (g0 << 16) | (r0 << 24) ;
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#else
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unsigned a1 = (int)(((rgba1 >> 24) & 0xff) * opacity) & 0xff; // adjust for desired opacity
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a1 = (t*a1) / 255;
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if (a1 == 0) return;
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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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data_(x,y)= (a0 << 24)| (b0 << 16) | (g0 << 8) | (r0) ;
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#endif
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}
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}
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inline unsigned width() const
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{
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return width_;
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}
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inline unsigned height() const
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{
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return height_;
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}
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inline void set_rectangle(int x0,int y0,image_data_32 const& data)
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{
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box2d<int> ext0(0,0,width_,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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#ifdef MAPNIK_BIG_ENDIAN
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row_to[x] = row_from[x-x0];
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#else
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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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#endif
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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_32& data)
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{
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box2d<int> ext0(0,0,width_,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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#ifdef MAPNIK_BIG_ENDIAN
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unsigned a1 = rgba1 & 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 >> 24) & 0xff;
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unsigned g1 = (rgba1 >> 16 ) & 0xff;
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unsigned b1 = (rgba1 >> 8) & 0xff;
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unsigned a0 = rgba0 & 0xff;
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unsigned r0 = ((rgba0 >> 24) & 0xff) * a0;
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unsigned g0 = ((rgba0 >> 16 ) & 0xff) * a0;
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unsigned b0 = ((rgba0 >> 8) & 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) | (b0 << 8) | (g0 << 16) | (r0 << 24) ;
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#else
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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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#endif
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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_32 const& data, unsigned x0, unsigned y0, float opacity)
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{
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box2d<int> ext0(0,0,width_,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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#ifdef MAPNIK_BIG_ENDIAN
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unsigned a1 = int( (rgba1 & 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 >> 24) & 0xff;
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unsigned g1 = (rgba1 >> 16 ) & 0xff;
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unsigned b1 = (rgba1 >> 8) & 0xff;
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unsigned a0 = rgba0 & 0xff;
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unsigned r0 = (rgba0 >> 24) & 0xff ;
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unsigned g0 = (rgba0 >> 16 ) & 0xff;
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unsigned b0 = (rgba0 >> 8) & 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)| (b0 << 8) | (g0 << 16) | (r0 << 24) ;
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#else
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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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#endif
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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_32 const& data, unsigned x0, unsigned y0, float opacity)
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{
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box2d<int> ext0(0,0,width_,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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#ifdef MAPNIK_BIG_ENDIAN
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unsigned a1 = int( (rgba1 & 0xff) * opacity );
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if (a1 == 0) continue;
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unsigned r1 = (rgba1 >> 24)& 0xff;
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unsigned g1 = (rgba1 >> 16 ) & 0xff;
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unsigned b1 = (rgba1 >> 8) & 0xff;
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unsigned a0 = rgba0 & 0xff;
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unsigned r0 = (rgba0 >> 24) & 0xff ;
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unsigned g0 = (rgba0 >> 16 ) & 0xff;
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unsigned b0 = (rgba0 >> 8) & 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)| (b0 << 8) | (g0 << 16) | (r0 << 24) ;
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#else
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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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|
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unsigned a = (a1 * 255 + (255 - a1) * a0 + 127)/255;
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|
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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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#endif
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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 //GRAPHICS_HPP
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