/usr/include/mapnik/graphics.hpp is in libmapnik-dev 2.2.0+ds1-6build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef MAPNIK_GRAPHICS_HPP
#define MAPNIK_GRAPHICS_HPP
// mapnik
#include <mapnik/color.hpp>
#include <mapnik/image_data.hpp>
#include <mapnik/box2d.hpp>
#include <mapnik/image_view.hpp>
#include <mapnik/global.hpp>
// stl
#include <cmath>
#include <string>
#include <cassert>
// cairo
#ifdef HAVE_CAIRO
#include <mapnik/cairo_context.hpp>
#endif
// boost
#include <boost/optional/optional.hpp>
namespace mapnik
{
class MAPNIK_DECL image_32
{
private:
unsigned width_;
unsigned height_;
boost::optional<color> background_;
image_data_32 data_;
bool painted_;
public:
image_32(int width,int height);
image_32(image_32 const& rhs);
#ifdef HAVE_CAIRO
explicit image_32(cairo_surface_ptr const& surface);
#endif
~image_32();
void painted(bool painted)
{
painted_ = painted;
}
bool painted() const
{
return painted_;
}
inline void clear()
{
std::memset(data_.getData(),0,sizeof(mapnik::image_data_32::pixel_type)*data_.width()*data_.height());
}
boost::optional<color> const& get_background() const;
void set_background(const color& c);
void premultiply();
void demultiply();
void set_grayscale_to_alpha();
void set_color_to_alpha(color const& c);
void set_alpha(float opacity);
inline const image_data_32& data() const
{
return data_;
}
inline image_data_32& data()
{
return data_;
}
inline const unsigned char* raw_data() const
{
return data_.getBytes();
}
inline unsigned char* raw_data()
{
return data_.getBytes();
}
inline image_view<image_data_32> get_view(unsigned x,unsigned y, unsigned w,unsigned h)
{
return image_view<image_data_32>(x,y,w,h,data_);
}
private:
inline bool checkBounds(int x, int y) const
{
return (x >= 0 && x < static_cast<int>(width_) && y >= 0 && y < static_cast<int>(height_));
}
public:
inline void setPixel(int x,int y,unsigned int rgba)
{
if (checkBounds(x,y))
{
data_(x,y)=rgba;
}
}
inline void blendPixel(int x,int y,unsigned int rgba1,int t)
{
blendPixel2(x,y,rgba1,t,1.0); // do not change opacity
}
inline void blendPixel2(int x,int y,unsigned int rgba1,int t,double opacity)
{
if (checkBounds(x,y))
{
unsigned rgba0 = data_(x,y);
#ifdef MAPNIK_BIG_ENDIAN
unsigned a1 = (unsigned)((rgba1 & 0xff) * opacity) & 0xff; // adjust for desired opacity
a1 = (t*a1) / 255;
if (a1 == 0) return;
unsigned r1 = (rgba1 >> 24) & 0xff;
unsigned g1 = (rgba1 >> 16 ) & 0xff;
unsigned b1 = (rgba1 >> 8) & 0xff;
unsigned a0 = (rgba0 & 0xff);
unsigned r0 = ((rgba0 >> 24 ) & 0xff) * a0;
unsigned g0 = ((rgba0 >> 16 ) & 0xff) * a0;
unsigned b0 = ((rgba0 >> 8) & 0xff) * a0;
a0 = ((a1 + a0) << 8) - a0*a1;
r0 = ((((r1 << 8) - r0) * a1 + (r0 << 8)) / a0);
g0 = ((((g1 << 8) - g0) * a1 + (g0 << 8)) / a0);
b0 = ((((b1 << 8) - b0) * a1 + (b0 << 8)) / a0);
a0 = a0 >> 8;
data_(x,y)= (a0)| (b0 << 8) | (g0 << 16) | (r0 << 24) ;
#else
unsigned a1 = (unsigned)(((rgba1 >> 24) & 0xff) * opacity) & 0xff; // adjust for desired opacity
a1 = (t*a1) / 255;
if (a1 == 0) return;
unsigned r1 = rgba1 & 0xff;
unsigned g1 = (rgba1 >> 8 ) & 0xff;
unsigned b1 = (rgba1 >> 16) & 0xff;
unsigned a0 = (rgba0 >> 24) & 0xff;
unsigned r0 = (rgba0 & 0xff) * a0;
unsigned g0 = ((rgba0 >> 8 ) & 0xff) * a0;
unsigned b0 = ((rgba0 >> 16) & 0xff) * a0;
a0 = ((a1 + a0) << 8) - a0*a1;
r0 = ((((r1 << 8) - r0) * a1 + (r0 << 8)) / a0);
g0 = ((((g1 << 8) - g0) * a1 + (g0 << 8)) / a0);
b0 = ((((b1 << 8) - b0) * a1 + (b0 << 8)) / a0);
a0 = a0 >> 8;
data_(x,y)= (a0 << 24)| (b0 << 16) | (g0 << 8) | (r0) ;
#endif
}
}
void composite_pixel(unsigned op, int x,int y,unsigned c, unsigned cover, double opacity);
inline unsigned width() const
{
return width_;
}
inline unsigned height() const
{
return height_;
}
inline void set_rectangle(int x0,int y0,image_data_32 const& data)
{
box2d<int> ext0(0,0,width_,height_);
box2d<int> ext1(x0,y0,x0+data.width(),y0+data.height());
if (ext0.intersects(ext1))
{
box2d<int> box = ext0.intersect(ext1);
for (int y = box.miny(); y < box.maxy(); ++y)
{
unsigned int* row_to = data_.getRow(y);
unsigned int const * row_from = data.getRow(y-y0);
for (int x = box.minx(); x < box.maxx(); ++x)
{
#ifdef MAPNIK_BIG_ENDIAN
row_to[x] = row_from[x-x0];
#else
if (row_from[x-x0] & 0xff000000)
{
row_to[x] = row_from[x-x0];
}
#endif
}
}
}
}
inline void set_rectangle_alpha(int x0,int y0,const image_data_32& data)
{
box2d<int> ext0(0,0,width_,height_);
box2d<int> ext1(x0,y0,x0 + data.width(),y0 + data.height());
if (ext0.intersects(ext1))
{
box2d<int> box = ext0.intersect(ext1);
for (int y = box.miny(); y < box.maxy(); ++y)
{
unsigned int* row_to = data_.getRow(y);
unsigned int const * row_from = data.getRow(y-y0);
for (int x = box.minx(); x < box.maxx(); ++x)
{
unsigned rgba0 = row_to[x];
unsigned rgba1 = row_from[x-x0];
#ifdef MAPNIK_BIG_ENDIAN
unsigned a1 = rgba1 & 0xff;
if (a1 == 0) continue;
if (a1 == 0xff)
{
row_to[x] = rgba1;
continue;
}
unsigned r1 = (rgba1 >> 24) & 0xff;
unsigned g1 = (rgba1 >> 16 ) & 0xff;
unsigned b1 = (rgba1 >> 8) & 0xff;
unsigned a0 = rgba0 & 0xff;
unsigned r0 = ((rgba0 >> 24) & 0xff) * a0;
unsigned g0 = ((rgba0 >> 16 ) & 0xff) * a0;
unsigned b0 = ((rgba0 >> 8) & 0xff) * a0;
a0 = ((a1 + a0) << 8) - a0*a1;
r0 = ((((r1 << 8) - r0) * a1 + (r0 << 8)) / a0);
g0 = ((((g1 << 8) - g0) * a1 + (g0 << 8)) / a0);
b0 = ((((b1 << 8) - b0) * a1 + (b0 << 8)) / a0);
a0 = a0 >> 8;
row_to[x] = (a0) | (b0 << 8) | (g0 << 16) | (r0 << 24) ;
#else
unsigned a1 = (rgba1 >> 24) & 0xff;
if (a1 == 0) continue;
if (a1 == 0xff)
{
row_to[x] = rgba1;
continue;
}
unsigned r1 = rgba1 & 0xff;
unsigned g1 = (rgba1 >> 8 ) & 0xff;
unsigned b1 = (rgba1 >> 16) & 0xff;
unsigned a0 = (rgba0 >> 24) & 0xff;
unsigned r0 = (rgba0 & 0xff) * a0;
unsigned g0 = ((rgba0 >> 8 ) & 0xff) * a0;
unsigned b0 = ((rgba0 >> 16) & 0xff) * a0;
a0 = ((a1 + a0) << 8) - a0*a1;
r0 = ((((r1 << 8) - r0) * a1 + (r0 << 8)) / a0);
g0 = ((((g1 << 8) - g0) * a1 + (g0 << 8)) / a0);
b0 = ((((b1 << 8) - b0) * a1 + (b0 << 8)) / a0);
a0 = a0 >> 8;
row_to[x] = (a0 << 24)| (b0 << 16) | (g0 << 8) | (r0) ;
#endif
}
}
}
}
inline void set_rectangle_alpha2(image_data_32 const& data, unsigned x0, unsigned y0, float opacity)
{
box2d<int> ext0(0,0,width_,height_);
box2d<int> ext1(x0,y0,x0 + data.width(),y0 + data.height());
if (ext0.intersects(ext1))
{
box2d<int> box = ext0.intersect(ext1);
for (int y = box.miny(); y < box.maxy(); ++y)
{
unsigned int* row_to = data_.getRow(y);
unsigned int const * row_from = data.getRow(y-y0);
for (int x = box.minx(); x < box.maxx(); ++x)
{
unsigned rgba0 = row_to[x];
unsigned rgba1 = row_from[x-x0];
#ifdef MAPNIK_BIG_ENDIAN
unsigned a1 = int( (rgba1 & 0xff) * opacity );
if (a1 == 0) continue;
if (a1 == 0xff)
{
row_to[x] = rgba1;
continue;
}
unsigned r1 = (rgba1 >> 24) & 0xff;
unsigned g1 = (rgba1 >> 16 ) & 0xff;
unsigned b1 = (rgba1 >> 8) & 0xff;
unsigned a0 = rgba0 & 0xff;
unsigned r0 = (rgba0 >> 24) & 0xff ;
unsigned g0 = (rgba0 >> 16 ) & 0xff;
unsigned b0 = (rgba0 >> 8) & 0xff;
unsigned atmp = a1 + a0 - ((a1 * a0 + 255) >> 8);
if (atmp)
{
r0 = byte((r1 * a1 + (r0 * a0) - ((r0 * a0 * a1 + 255) >> 8)) / atmp);
g0 = byte((g1 * a1 + (g0 * a0) - ((g0 * a0 * a1 + 255) >> 8)) / atmp);
b0 = byte((b1 * a1 + (b0 * a0) - ((b0 * a0 * a1 + 255) >> 8)) / atmp);
}
a0 = byte(atmp);
row_to[x] = (a0)| (b0 << 8) | (g0 << 16) | (r0 << 24) ;
#else
unsigned a1 = int( ((rgba1 >> 24) & 0xff) * opacity );
if (a1 == 0) continue;
if (a1 == 0xff)
{
row_to[x] = rgba1;
continue;
}
unsigned r1 = rgba1 & 0xff;
unsigned g1 = (rgba1 >> 8 ) & 0xff;
unsigned b1 = (rgba1 >> 16) & 0xff;
unsigned a0 = (rgba0 >> 24) & 0xff;
unsigned r0 = rgba0 & 0xff ;
unsigned g0 = (rgba0 >> 8 ) & 0xff;
unsigned b0 = (rgba0 >> 16) & 0xff;
unsigned atmp = a1 + a0 - ((a1 * a0 + 255) >> 8);
if (atmp)
{
r0 = byte((r1 * a1 + (r0 * a0) - ((r0 * a0 * a1 + 255) >> 8)) / atmp);
g0 = byte((g1 * a1 + (g0 * a0) - ((g0 * a0 * a1 + 255) >> 8)) / atmp);
b0 = byte((b1 * a1 + (b0 * a0) - ((b0 * a0 * a1 + 255) >> 8)) / atmp);
}
a0 = byte(atmp);
row_to[x] = (a0 << 24)| (b0 << 16) | (g0 << 8) | (r0) ;
#endif
}
}
}
}
template <typename MergeMethod>
inline void merge_rectangle(image_data_32 const& data, unsigned x0, unsigned y0, float opacity)
{
box2d<int> ext0(0,0,width_,height_);
box2d<int> ext1(x0,y0,x0 + data.width(),y0 + data.height());
if (ext0.intersects(ext1))
{
box2d<int> box = ext0.intersect(ext1);
for (int y = box.miny(); y < box.maxy(); ++y)
{
unsigned int* row_to = data_.getRow(y);
unsigned int const * row_from = data.getRow(y-y0);
for (int x = box.minx(); x < box.maxx(); ++x)
{
unsigned rgba0 = row_to[x];
unsigned rgba1 = row_from[x-x0];
#ifdef MAPNIK_BIG_ENDIAN
unsigned a1 = int( (rgba1 & 0xff) * opacity );
if (a1 == 0) continue;
unsigned r1 = (rgba1 >> 24)& 0xff;
unsigned g1 = (rgba1 >> 16 ) & 0xff;
unsigned b1 = (rgba1 >> 8) & 0xff;
unsigned a0 = rgba0 & 0xff;
unsigned r0 = (rgba0 >> 24) & 0xff ;
unsigned g0 = (rgba0 >> 16 ) & 0xff;
unsigned b0 = (rgba0 >> 8) & 0xff;
unsigned a = (a1 * 255 + (255 - a1) * a0 + 127)/255;
MergeMethod::mergeRGB(r0,g0,b0,r1,g1,b1);
r0 = (r1*a1 + (((255 - a1) * a0 + 127)/255) * r0 + 127)/a;
g0 = (g1*a1 + (((255 - a1) * a0 + 127)/255) * g0 + 127)/a;
b0 = (b1*a1 + (((255 - a1) * a0 + 127)/255) * b0 + 127)/a;
row_to[x] = (a)| (b0 << 8) | (g0 << 16) | (r0 << 24) ;
#else
unsigned a1 = int( ((rgba1 >> 24) & 0xff) * opacity );
if (a1 == 0) continue;
unsigned r1 = rgba1 & 0xff;
unsigned g1 = (rgba1 >> 8 ) & 0xff;
unsigned b1 = (rgba1 >> 16) & 0xff;
unsigned a0 = (rgba0 >> 24) & 0xff;
unsigned r0 = rgba0 & 0xff ;
unsigned g0 = (rgba0 >> 8 ) & 0xff;
unsigned b0 = (rgba0 >> 16) & 0xff;
unsigned a = (a1 * 255 + (255 - a1) * a0 + 127)/255;
MergeMethod::mergeRGB(r0,g0,b0,r1,g1,b1);
r0 = (r1*a1 + (((255 - a1) * a0 + 127)/255) * r0 + 127)/a;
g0 = (g1*a1 + (((255 - a1) * a0 + 127)/255) * g0 + 127)/a;
b0 = (b1*a1 + (((255 - a1) * a0 + 127)/255) * b0 + 127)/a;
row_to[x] = (a << 24)| (b0 << 16) | (g0 << 8) | (r0) ;
#endif
}
}
}
}
};
}
#endif // MAPNIK_GRAPHICS_HPP
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