| 1 | /***************************************************************************** |
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| 2 | * |
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| 3 | * This file is part of Mapnik (c++ mapping toolkit) |
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| 4 | * |
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| 5 | * Copyright (C) 2006 Artem Pavlenko |
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| 6 | * |
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| 7 | * This library is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * This library is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with this library; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | * |
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| 21 | *****************************************************************************/ |
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| 22 | |
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| 23 | //$Id: graphics.hpp 39 2005-04-10 20:39:53Z pavlenko $ |
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| 24 | |
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| 25 | #ifndef GRAPHICS_HPP |
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| 26 | #define GRAPHICS_HPP |
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| 27 | // mapnik |
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| 28 | #include <mapnik/color.hpp> |
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| 29 | #include <mapnik/gamma.hpp> |
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| 30 | #include <mapnik/image_data.hpp> |
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| 31 | #include <mapnik/box2d.hpp> |
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| 32 | #include <mapnik/image_view.hpp> |
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| 33 | #include <mapnik/global.hpp> |
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| 34 | |
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| 35 | // stl |
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| 36 | #include <cmath> |
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| 37 | #include <string> |
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| 38 | #include <cassert> |
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| 39 | |
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| 40 | // cairo |
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| 41 | #ifdef HAVE_CAIRO |
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| 42 | #include <cairomm/surface.h> |
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| 43 | #endif |
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| 44 | |
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| 45 | namespace mapnik |
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| 46 | { |
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| 47 | |
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| 48 | struct Multiply |
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| 49 | { |
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| 50 | inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0, |
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| 51 | unsigned &r1, unsigned &g1, unsigned &b1) |
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| 52 | { |
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| 53 | r1 = r1*r0/255; |
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| 54 | g1 = g1*g0/255; |
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| 55 | b1 = b1*b0/255; |
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| 56 | } |
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| 57 | }; |
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| 58 | struct Multiply2 |
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| 59 | { |
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| 60 | inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0, |
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| 61 | unsigned &r1, unsigned &g1, unsigned &b1) |
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| 62 | { |
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| 63 | r1 = r1*r0/128; |
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| 64 | if (r1>255) r1=255; |
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| 65 | g1 = g1*g0/128; |
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| 66 | if (g1>255) g1=255; |
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| 67 | b1 = b1*b0/128; |
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| 68 | if (b1>255) b1=255; |
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| 69 | } |
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| 70 | }; |
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| 71 | struct Divide |
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| 72 | { |
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| 73 | inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0, |
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| 74 | unsigned &r1, unsigned &g1, unsigned &b1) |
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| 75 | { |
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| 76 | r1 = r0*256/(r1+1); |
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| 77 | g1 = g0*256/(g1+1); |
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| 78 | b1 = b0*256/(b1+1); |
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| 79 | } |
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| 80 | }; |
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| 81 | struct Divide2 |
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| 82 | { |
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| 83 | inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0, |
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| 84 | unsigned &r1, unsigned &g1, unsigned &b1) |
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| 85 | { |
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| 86 | r1 = r0*128/(r1+1); |
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| 87 | g1 = g0*128/(g1+1); |
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| 88 | b1 = b0*128/(b1+1); |
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| 89 | } |
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| 90 | }; |
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| 91 | struct Screen |
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| 92 | { |
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| 93 | inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0, |
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| 94 | unsigned &r1, unsigned &g1, unsigned &b1) |
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| 95 | { |
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| 96 | r1 = 255 - (255-r0)*(255-r1)/255; |
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| 97 | g1 = 255 - (255-g0)*(255-g1)/255; |
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| 98 | b1 = 255 - (255-b0)*(255-b1)/255; |
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| 99 | } |
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| 100 | }; |
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| 101 | struct HardLight |
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| 102 | { |
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| 103 | inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0, |
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| 104 | unsigned &r1, unsigned &g1, unsigned &b1) |
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| 105 | { |
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| 106 | r1 = (r1>128)?255-(255-r0)*(255-2*(r1-128))/256:r0*r1*2/256; |
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| 107 | g1 = (g1>128)?255-(255-g0)*(255-2*(g1-128))/256:g0*g1*2/256; |
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| 108 | b1 = (b1>128)?255-(255-b0)*(255-2*(b1-128))/256:b0*b1*2/256; |
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| 109 | } |
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| 110 | }; |
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| 111 | struct MergeGrain |
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| 112 | { |
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| 113 | inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0, |
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| 114 | unsigned &r1, unsigned &g1, unsigned &b1) |
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| 115 | { |
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| 116 | r1 = (r1+r0>128)?r1+r0-128:0; |
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| 117 | if (r1>255) r1=255; |
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| 118 | g1 = (g1+g0>128)?g1+g0-128:0; |
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| 119 | if (g1>255) g1=255; |
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| 120 | b1 = (b1+b0>128)?b1+b0-128:0; |
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| 121 | if (b1>255) b1=255; |
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| 122 | } |
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| 123 | }; |
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| 124 | struct MergeGrain2 |
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| 125 | { |
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| 126 | inline static void mergeRGB(unsigned const &r0, unsigned const &g0, unsigned const &b0, |
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| 127 | unsigned &r1, unsigned &g1, unsigned &b1) |
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| 128 | { |
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| 129 | r1 = (2*r1+r0>256)?2*r1+r0-256:0; |
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| 130 | if (r1>255) r1=255; |
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| 131 | g1 = (2*g1+g0>256)?2*g1+g0-256:0; |
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| 132 | if (g1>255) g1=255; |
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| 133 | b1 = (2*b1+b0>256)?2*b1+b0-256:0; |
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| 134 | if (b1>255) b1=255; |
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| 135 | } |
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| 136 | }; |
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| 137 | |
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| 138 | class MAPNIK_DECL image_32 |
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| 139 | { |
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| 140 | private: |
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| 141 | unsigned width_; |
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| 142 | unsigned height_; |
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| 143 | color background_; |
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| 144 | image_data_32 data_; |
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| 145 | public: |
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| 146 | image_32(int width,int height); |
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| 147 | image_32(image_32 const& rhs); |
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| 148 | #ifdef HAVE_CAIRO |
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| 149 | image_32(Cairo::RefPtr<Cairo::ImageSurface> rhs); |
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| 150 | #endif |
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| 151 | ~image_32(); |
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| 152 | void set_background(color const& background); |
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| 153 | const color& get_background() const; |
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| 154 | const image_data_32& data() const; |
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| 155 | |
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| 156 | inline image_data_32& data() |
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| 157 | { |
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| 158 | return data_; |
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| 159 | } |
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| 160 | |
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| 161 | inline const unsigned char* raw_data() const |
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| 162 | { |
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| 163 | return data_.getBytes(); |
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| 164 | } |
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| 165 | |
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| 166 | inline unsigned char* raw_data() |
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| 167 | { |
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| 168 | return data_.getBytes(); |
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| 169 | } |
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| 170 | |
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| 171 | inline image_view<image_data_32> get_view(unsigned x,unsigned y, unsigned w,unsigned h) |
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| 172 | { |
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| 173 | return image_view<image_data_32>(x,y,w,h,data_); |
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| 174 | } |
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| 175 | |
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| 176 | private: |
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| 177 | |
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| 178 | inline bool checkBounds(unsigned x, unsigned y) const |
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| 179 | { |
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| 180 | return (x < width_ && y < height_); |
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| 181 | } |
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| 182 | |
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| 183 | public: |
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| 184 | inline void setPixel(int x,int y,unsigned int rgba) |
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| 185 | { |
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| 186 | if (checkBounds(x,y)) |
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| 187 | { |
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| 188 | data_(x,y)=rgba; |
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| 189 | } |
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| 190 | } |
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| 191 | inline void blendPixel(int x,int y,unsigned int rgba1,int t) |
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| 192 | { |
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| 193 | blendPixel2(x,y,rgba1,t,1.0); // do not change opacity |
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| 194 | } |
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| 195 | |
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| 196 | inline void blendPixel2(int x,int y,unsigned int rgba1,int t,double opacity) |
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| 197 | { |
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| 198 | if (checkBounds(x,y)) |
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| 199 | { |
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| 200 | unsigned rgba0 = data_(x,y); |
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| 201 | #ifdef MAPNIK_BIG_ENDIAN |
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| 202 | unsigned a1 = (int)((rgba1 & 0xff) * opacity) & 0xff; // adjust for desired opacity |
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| 203 | a1 = (t*a1) / 255; |
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| 204 | if (a1 == 0) return; |
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| 205 | unsigned r1 = (rgba1 >> 24) & 0xff; |
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| 206 | unsigned g1 = (rgba1 >> 16 ) & 0xff; |
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| 207 | unsigned b1 = (rgba1 >> 8) & 0xff; |
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| 208 | |
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| 209 | unsigned a0 = (rgba0 & 0xff); |
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| 210 | unsigned r0 = ((rgba0 >> 24 ) & 0xff) * a0; |
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| 211 | unsigned g0 = ((rgba0 >> 16 ) & 0xff) * a0; |
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| 212 | unsigned b0 = ((rgba0 >> 8) & 0xff) * a0; |
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| 213 | |
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| 214 | a0 = ((a1 + a0) << 8) - a0*a1; |
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| 215 | |
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| 216 | r0 = ((((r1 << 8) - r0) * a1 + (r0 << 8)) / a0); |
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| 217 | g0 = ((((g1 << 8) - g0) * a1 + (g0 << 8)) / a0); |
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| 218 | b0 = ((((b1 << 8) - b0) * a1 + (b0 << 8)) / a0); |
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| 219 | a0 = a0 >> 8; |
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| 220 | data_(x,y)= (a0)| (b0 << 8) | (g0 << 16) | (r0 << 24) ; |
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| 221 | #else |
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| 222 | unsigned a1 = (int)(((rgba1 >> 24) & 0xff) * opacity) & 0xff; // adjust for desired opacity |
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| 223 | a1 = (t*a1) / 255; |
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| 224 | if (a1 == 0) return; |
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| 225 | unsigned r1 = rgba1 & 0xff; |
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| 226 | unsigned g1 = (rgba1 >> 8 ) & 0xff; |
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| 227 | unsigned b1 = (rgba1 >> 16) & 0xff; |
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| 228 | |
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| 229 | unsigned a0 = (rgba0 >> 24) & 0xff; |
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| 230 | unsigned r0 = (rgba0 & 0xff) * a0; |
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| 231 | unsigned g0 = ((rgba0 >> 8 ) & 0xff) * a0; |
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| 232 | unsigned b0 = ((rgba0 >> 16) & 0xff) * a0; |
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| 233 | |
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| 234 | a0 = ((a1 + a0) << 8) - a0*a1; |
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| 235 | |
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| 236 | r0 = ((((r1 << 8) - r0) * a1 + (r0 << 8)) / a0); |
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| 237 | g0 = ((((g1 << 8) - g0) * a1 + (g0 << 8)) / a0); |
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| 238 | b0 = ((((b1 << 8) - b0) * a1 + (b0 << 8)) / a0); |
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| 239 | a0 = a0 >> 8; |
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| 240 | data_(x,y)= (a0 << 24)| (b0 << 16) | (g0 << 8) | (r0) ; |
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| 241 | #endif |
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| 242 | } |
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| 243 | } |
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| 244 | |
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| 245 | inline unsigned width() const |
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| 246 | { |
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| 247 | return width_; |
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| 248 | } |
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| 249 | |
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| 250 | inline unsigned height() const |
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| 251 | { |
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| 252 | return height_; |
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| 253 | } |
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| 254 | |
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| 255 | inline void set_rectangle(int x0,int y0,image_data_32 const& data) |
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| 256 | { |
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| 257 | box2d<int> ext0(0,0,width_,height_); |
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| 258 | box2d<int> ext1(x0,y0,x0+data.width(),y0+data.height()); |
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| 259 | |
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| 260 | if (ext0.intersects(ext1)) |
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| 261 | { |
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| 262 | box2d<int> box = ext0.intersect(ext1); |
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| 263 | for (int y = box.miny(); y < box.maxy(); ++y) |
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| 264 | { |
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| 265 | unsigned int* row_to = data_.getRow(y); |
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| 266 | unsigned int const * row_from = data.getRow(y-y0); |
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| 267 | |
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| 268 | for (int x = box.minx(); x < box.maxx(); ++x) |
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| 269 | { |
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| 270 | #ifdef MAPNIK_BIG_ENDIAN |
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| 271 | row_to[x] = row_from[x-x0]; |
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| 272 | #else |
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| 273 | if (row_from[x-x0] & 0xff000000) |
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| 274 | { |
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| 275 | row_to[x] = row_from[x-x0]; |
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| 276 | } |
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| 277 | #endif |
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| 278 | } |
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| 279 | } |
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| 280 | } |
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| 281 | } |
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| 282 | |
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| 283 | inline void set_rectangle_alpha(int x0,int y0,const image_data_32& data) |
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| 284 | { |
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| 285 | box2d<int> ext0(0,0,width_,height_); |
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| 286 | box2d<int> ext1(x0,y0,x0 + data.width(),y0 + data.height()); |
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| 287 | |
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| 288 | if (ext0.intersects(ext1)) |
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| 289 | { |
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| 290 | box2d<int> box = ext0.intersect(ext1); |
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| 291 | for (int y = box.miny(); y < box.maxy(); ++y) |
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| 292 | { |
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| 293 | unsigned int* row_to = data_.getRow(y); |
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| 294 | unsigned int const * row_from = data.getRow(y-y0); |
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| 295 | for (int x = box.minx(); x < box.maxx(); ++x) |
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| 296 | { |
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| 297 | unsigned rgba0 = row_to[x]; |
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| 298 | unsigned rgba1 = row_from[x-x0]; |
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| 299 | |
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| 300 | #ifdef MAPNIK_BIG_ENDIAN |
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| 301 | unsigned a1 = rgba1 & 0xff; |
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| 302 | if (a1 == 0) continue; |
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| 303 | unsigned r1 = (rgba1 >> 24) & 0xff; |
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| 304 | unsigned g1 = (rgba1 >> 16 ) & 0xff; |
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| 305 | unsigned b1 = (rgba1 >> 8) & 0xff; |
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| 306 | |
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| 307 | unsigned a0 = rgba0 & 0xff; |
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| 308 | unsigned r0 = ((rgba0 >> 24) & 0xff) * a0; |
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| 309 | unsigned g0 = ((rgba0 >> 16 ) & 0xff) * a0; |
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| 310 | unsigned b0 = ((rgba0 >> 8) & 0xff) * a0; |
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| 311 | |
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| 312 | a0 = ((a1 + a0) << 8) - a0*a1; |
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| 313 | |
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| 314 | r0 = ((((r1 << 8) - r0) * a1 + (r0 << 8)) / a0); |
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| 315 | g0 = ((((g1 << 8) - g0) * a1 + (g0 << 8)) / a0); |
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| 316 | b0 = ((((b1 << 8) - b0) * a1 + (b0 << 8)) / a0); |
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| 317 | a0 = a0 >> 8; |
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| 318 | row_to[x] = (a0) | (b0 << 8) | (g0 << 16) | (r0 << 24) ; |
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| 319 | #else |
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| 320 | unsigned a1 = (rgba1 >> 24) & 0xff; |
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| 321 | if (a1 == 0) continue; |
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| 322 | unsigned r1 = rgba1 & 0xff; |
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| 323 | unsigned g1 = (rgba1 >> 8 ) & 0xff; |
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| 324 | unsigned b1 = (rgba1 >> 16) & 0xff; |
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| 325 | |
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| 326 | unsigned a0 = (rgba0 >> 24) & 0xff; |
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| 327 | unsigned r0 = (rgba0 & 0xff) * a0; |
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| 328 | unsigned g0 = ((rgba0 >> 8 ) & 0xff) * a0; |
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| 329 | unsigned b0 = ((rgba0 >> 16) & 0xff) * a0; |
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| 330 | |
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| 331 | a0 = ((a1 + a0) << 8) - a0*a1; |
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| 332 | |
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| 333 | r0 = ((((r1 << 8) - r0) * a1 + (r0 << 8)) / a0); |
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| 334 | g0 = ((((g1 << 8) - g0) * a1 + (g0 << 8)) / a0); |
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| 335 | b0 = ((((b1 << 8) - b0) * a1 + (b0 << 8)) / a0); |
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| 336 | a0 = a0 >> 8; |
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| 337 | row_to[x] = (a0 << 24)| (b0 << 16) | (g0 << 8) | (r0) ; |
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| 338 | #endif |
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| 339 | } |
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| 340 | } |
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| 341 | } |
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| 342 | } |
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| 343 | |
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| 344 | inline void set_rectangle_alpha2(image_data_32 const& data, unsigned x0, unsigned y0, float opacity) |
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| 345 | { |
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| 346 | box2d<int> ext0(0,0,width_,height_); |
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| 347 | box2d<int> ext1(x0,y0,x0 + data.width(),y0 + data.height()); |
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| 348 | |
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| 349 | if (ext0.intersects(ext1)) |
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| 350 | { |
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| 351 | box2d<int> box = ext0.intersect(ext1); |
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| 352 | for (int y = box.miny(); y < box.maxy(); ++y) |
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| 353 | { |
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| 354 | unsigned int* row_to = data_.getRow(y); |
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| 355 | unsigned int const * row_from = data.getRow(y-y0); |
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| 356 | for (int x = box.minx(); x < box.maxx(); ++x) |
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| 357 | { |
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| 358 | unsigned rgba0 = row_to[x]; |
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| 359 | unsigned rgba1 = row_from[x-x0]; |
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| 360 | #ifdef MAPNIK_BIG_ENDIAN |
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| 361 | unsigned a1 = int( (rgba1 & 0xff) * opacity ); |
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| 362 | if (a1 == 0) continue; |
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| 363 | unsigned r1 = (rgba1 >> 24) & 0xff; |
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| 364 | unsigned g1 = (rgba1 >> 16 ) & 0xff; |
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| 365 | unsigned b1 = (rgba1 >> 8) & 0xff; |
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| 366 | |
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| 367 | unsigned a0 = rgba0 & 0xff; |
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| 368 | unsigned r0 = (rgba0 >> 24) & 0xff ; |
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| 369 | unsigned g0 = (rgba0 >> 16 ) & 0xff; |
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| 370 | unsigned b0 = (rgba0 >> 8) & 0xff; |
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| 371 | |
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| 372 | r0 = byte(((r1 - r0) * a1 + (r0 << 8)) >> 8); |
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| 373 | g0 = byte(((g1 - g0) * a1 + (g0 << 8)) >> 8); |
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| 374 | b0 = byte(((b1 - b0) * a1 + (b0 << 8)) >> 8); |
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| 375 | a0 = byte((a1 + a0) - ((a1 * a0 + 255) >> 8)); |
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| 376 | |
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| 377 | row_to[x] = (a0)| (b0 << 8) | (g0 << 16) | (r0 << 24) ; |
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| 378 | #else |
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| 379 | unsigned a1 = int( ((rgba1 >> 24) & 0xff) * opacity ); |
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| 380 | if (a1 == 0) continue; |
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| 381 | unsigned r1 = rgba1 & 0xff; |
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| 382 | unsigned g1 = (rgba1 >> 8 ) & 0xff; |
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| 383 | unsigned b1 = (rgba1 >> 16) & 0xff; |
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| 384 | |
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| 385 | unsigned a0 = (rgba0 >> 24) & 0xff; |
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| 386 | unsigned r0 = rgba0 & 0xff ; |
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| 387 | unsigned g0 = (rgba0 >> 8 ) & 0xff; |
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| 388 | unsigned b0 = (rgba0 >> 16) & 0xff; |
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| 389 | |
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| 390 | r0 = byte(((r1 - r0) * a1 + (r0 << 8)) >> 8); |
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| 391 | g0 = byte(((g1 - g0) * a1 + (g0 << 8)) >> 8); |
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| 392 | b0 = byte(((b1 - b0) * a1 + (b0 << 8)) >> 8); |
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| 393 | a0 = byte((a1 + a0) - ((a1 * a0 + 255) >> 8)); |
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| 394 | |
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| 395 | row_to[x] = (a0 << 24)| (b0 << 16) | (g0 << 8) | (r0) ; |
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| 396 | #endif |
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| 397 | } |
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| 398 | } |
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| 399 | } |
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| 400 | } |
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| 401 | |
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| 402 | template <typename MergeMethod> |
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| 403 | inline void merge_rectangle(image_data_32 const& data, unsigned x0, unsigned y0, float opacity) |
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| 404 | { |
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| 405 | box2d<int> ext0(0,0,width_,height_); |
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| 406 | box2d<int> ext1(x0,y0,x0 + data.width(),y0 + data.height()); |
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| 407 | |
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| 408 | if (ext0.intersects(ext1)) |
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| 409 | { |
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| 410 | box2d<int> box = ext0.intersect(ext1); |
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| 411 | for (int y = box.miny(); y < box.maxy(); ++y) |
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| 412 | { |
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| 413 | unsigned int* row_to = data_.getRow(y); |
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| 414 | unsigned int const * row_from = data.getRow(y-y0); |
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| 415 | for (int x = box.minx(); x < box.maxx(); ++x) |
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| 416 | { |
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| 417 | unsigned rgba0 = row_to[x]; |
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| 418 | unsigned rgba1 = row_from[x-x0]; |
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| 419 | #ifdef MAPNIK_BIG_ENDIAN |
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| 420 | unsigned a1 = int( (rgba1 & 0xff) * opacity ); |
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| 421 | if (a1 == 0) continue; |
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| 422 | unsigned r1 = (rgba1 >> 24)& 0xff; |
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| 423 | unsigned g1 = (rgba1 >> 16 ) & 0xff; |
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| 424 | unsigned b1 = (rgba1 >> 8) & 0xff; |
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| 425 | |
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| 426 | unsigned a0 = rgba0 & 0xff; |
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| 427 | unsigned r0 = (rgba0 >> 24) & 0xff ; |
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| 428 | unsigned g0 = (rgba0 >> 16 ) & 0xff; |
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| 429 | unsigned b0 = (rgba0 >> 8) & 0xff; |
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| 430 | |
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| 431 | unsigned a = (a1 * 255 + (255 - a1) * a0 + 127)/255; |
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| 432 | |
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| 433 | MergeMethod::mergeRGB(r0,g0,b0,r1,g1,b1); |
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| 434 | |
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| 435 | r0 = (r1*a1 + (((255 - a1) * a0 + 127)/255) * r0 + 127)/a; |
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| 436 | g0 = (g1*a1 + (((255 - a1) * a0 + 127)/255) * g0 + 127)/a; |
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| 437 | b0 = (b1*a1 + (((255 - a1) * a0 + 127)/255) * b0 + 127)/a; |
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| 438 | |
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| 439 | row_to[x] = (a)| (b0 << 8) | (g0 << 16) | (r0 << 24) ; |
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| 440 | #else |
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| 441 | unsigned a1 = int( ((rgba1 >> 24) & 0xff) * opacity ); |
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| 442 | if (a1 == 0) continue; |
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| 443 | unsigned r1 = rgba1 & 0xff; |
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| 444 | unsigned g1 = (rgba1 >> 8 ) & 0xff; |
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| 445 | unsigned b1 = (rgba1 >> 16) & 0xff; |
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| 446 | |
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| 447 | unsigned a0 = (rgba0 >> 24) & 0xff; |
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| 448 | unsigned r0 = rgba0 & 0xff ; |
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| 449 | unsigned g0 = (rgba0 >> 8 ) & 0xff; |
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| 450 | unsigned b0 = (rgba0 >> 16) & 0xff; |
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| 451 | |
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| 452 | unsigned a = (a1 * 255 + (255 - a1) * a0 + 127)/255; |
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| 453 | |
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| 454 | MergeMethod::mergeRGB(r0,g0,b0,r1,g1,b1); |
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| 455 | |
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| 456 | r0 = (r1*a1 + (((255 - a1) * a0 + 127)/255) * r0 + 127)/a; |
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| 457 | g0 = (g1*a1 + (((255 - a1) * a0 + 127)/255) * g0 + 127)/a; |
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| 458 | b0 = (b1*a1 + (((255 - a1) * a0 + 127)/255) * b0 + 127)/a; |
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| 459 | |
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| 460 | row_to[x] = (a << 24)| (b0 << 16) | (g0 << 8) | (r0) ; |
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| 461 | #endif |
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| 462 | } |
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| 463 | } |
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| 464 | } |
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| 465 | } |
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| 466 | }; |
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| 467 | } |
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| 468 | #endif //GRAPHICS_HPP |
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