120 lines
2.9 KiB
C++
120 lines
2.9 KiB
C++
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/* This file is part of Mapnik (c++ mapping toolkit)
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* Copyright (C) 2005 Artem Pavlenko
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*
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* Mapnik is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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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#include <cmath>
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#include <string>
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#include <cassert>
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#include "style.hpp"
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#include "gamma.hpp"
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#include "image_data.hpp"
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namespace mapnik
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{
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class Image32
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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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ImageData32 data_;
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static gamma gammaTable_;
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public:
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Image32(int width,int height);
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Image32(const Image32& rhs);
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~Image32();
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static void setGamma(double gamma);
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void setBackground(const Color& background);
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const Color& getBackground() const;
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void set_rectangle(unsigned x,unsigned y,const ImageData32& data);
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const ImageData32& data() const;
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inline ImageData32& data() {
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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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void saveToFile(const std::string& file,const std::string& format="auto");
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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 int blendColor(int c0,int c1,int t)
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{
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int bgRed=(c1>>16)&0xff;
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int bgGreen=(c1>>8)&0xff;
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int bgBlue=c1&0xff;
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int red=(c0>>16)&0xff;
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int green=(c0>>8)&0xff;
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int blue=c0&0xff;
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int alpha=t;
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int r=gammaTable_.l2g[(gammaTable_.g2l[red]*alpha+gammaTable_.g2l[bgRed]*(255-alpha))>>8];
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int g=gammaTable_.l2g[(gammaTable_.g2l[green]*alpha+gammaTable_.g2l[bgGreen]*(255-alpha))>>8];
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int b=gammaTable_.l2g[(gammaTable_.g2l[blue]*alpha+gammaTable_.g2l[bgBlue]*(255-alpha))>>8];
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return 0xff<<24 | r<<16 | g<<8 | b;
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}
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inline void blendPixel(int x,int y,unsigned int rgba,int t)
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{
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if (checkBounds(x,y))
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{
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int bg=data_(x,y);
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int nc=blendColor(rgba,bg,t);
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data_(x,y)=nc;
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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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};
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}
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#endif //GRAPHICS_HPP
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