176 lines
5 KiB
C++
176 lines
5 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) 2011 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.cpp 17 2005-03-08 23:58:43Z pavlenko $
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// mapnik
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#include <mapnik/graphics.hpp>
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#include <mapnik/image_util.hpp>
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#include <mapnik/global.hpp>
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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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#include <boost/scoped_array.hpp>
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#include <iostream>
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namespace mapnik
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{
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image_32::image_32(int width,int height)
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:width_(width),
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height_(height),
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data_(width,height),
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painted_(false) {}
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image_32::image_32(const image_32& rhs)
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:width_(rhs.width_),
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height_(rhs.height_),
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data_(rhs.data_),
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painted_(rhs.painted_) {}
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#ifdef HAVE_CAIRO
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image_32::image_32(Cairo::RefPtr<Cairo::ImageSurface> rhs)
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:width_(rhs->get_width()),
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height_(rhs->get_height()),
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data_(rhs->get_width(),rhs->get_height())
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{
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painted_ = true;
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if (rhs->get_format() != Cairo::FORMAT_ARGB32)
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{
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std::cerr << "Unable to convert this Cairo format\n";
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return; // throw exception ??
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}
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int stride = rhs->get_stride() / 4;
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boost::scoped_array<unsigned int> out_row(new unsigned int[width_]);
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const unsigned int *in_row = (const unsigned int *)rhs->get_data();
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for (unsigned int row = 0; row < height_; row++, in_row += stride)
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{
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for (unsigned int column = 0; column < width_; column++)
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{
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unsigned int in = in_row[column];
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unsigned int a = (in >> 24) & 0xff;
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unsigned int r = (in >> 16) & 0xff;
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unsigned int g = (in >> 8) & 0xff;
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unsigned int b = (in >> 0) & 0xff;
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#define DE_ALPHA(x) do { \
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if (a == 0) x = 0; \
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else x = x * 255 / a; \
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if (x > 255) x = 255; \
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} while(0)
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DE_ALPHA(r);
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DE_ALPHA(g);
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DE_ALPHA(b);
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out_row[column] = color(r, g, b, a).rgba();
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}
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data_.setRow(row, out_row.get(), width_);
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}
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}
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#endif
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image_32::~image_32() {}
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void image_32::set_grayscale_to_alpha()
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{
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for (unsigned int y = 0; y < height_; ++y)
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{
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unsigned int* row_from = data_.getRow(y);
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for (unsigned int x = 0; x < width_; ++x)
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{
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unsigned rgba = row_from[x];
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// TODO - big endian support
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unsigned r = rgba & 0xff;
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unsigned g = (rgba >> 8 ) & 0xff;
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unsigned b = (rgba >> 16) & 0xff;
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// magic numbers for grayscale
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unsigned a = (int)((r * .3) + (g * .59) + (b * .11));
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row_from[x] = (a << 24)| (255 << 16) | (255 << 8) | (255) ;
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}
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}
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}
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void image_32::set_color_to_alpha(const color& /*c*/)
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{
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// TODO - function to set all pixels to a % alpha based on distance to a given color
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}
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void image_32::set_alpha(float opacity)
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{
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{
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for (unsigned int y = 0; y < height_; ++y)
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{
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unsigned int* row_to = data_.getRow(y);
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for (unsigned int x = 0; x < width_; ++x)
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{
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unsigned rgba = row_to[x];
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#ifdef MAPNIK_BIG_ENDIAN
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unsigned a0 = (rgba & 0xff);
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unsigned a1 = int( (rgba & 0xff) * opacity );
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if (a0 == a1) continue;
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unsigned r = (rgba >> 24) & 0xff;
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unsigned g = (rgba >> 16 ) & 0xff;
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unsigned b = (rgba >> 8) & 0xff;
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row_to[x] = (a1) | (b << 8) | (g << 16) | (r << 24) ;
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#else
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unsigned a0 = (rgba >> 24) & 0xff;
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unsigned a1 = int( ((rgba >> 24) & 0xff) * opacity );
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//unsigned a1 = opacity;
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if (a0 == a1) continue;
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unsigned r = rgba & 0xff;
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unsigned g = (rgba >> 8 ) & 0xff;
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unsigned b = (rgba >> 16) & 0xff;
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row_to[x] = (a1 << 24)| (b << 16) | (g << 8) | (r) ;
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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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void image_32::set_background(const color& c)
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{
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background_=c;
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data_.set(background_->rgba());
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}
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boost::optional<color> const& image_32::get_background() const
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{
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return background_;
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}
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}
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