108 lines
3 KiB
C++
108 lines
3 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.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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// 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 <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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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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#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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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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unsigned int out_row[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, 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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const image_data_32& image_32::data() const
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{
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return data_;
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}
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void image_32::set_background(const color& background)
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{
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background_=background;
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data_.set(background_.rgba());
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}
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const color& 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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