111 lines
3 KiB
C++
111 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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//$Id$
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#ifndef IMAGE_VIEW_HPP
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#define IMAGE_VIEW_HPP
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namespace mapnik {
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template <typename T>
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class image_view
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{
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public:
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typedef typename T::pixel_type pixel_type;
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image_view(unsigned x, unsigned y, unsigned width, unsigned height, T const& data)
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: x_(x),
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y_(y),
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width_(width),
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height_(height),
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data_(data)
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{
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if (x_ >= data_.width()) x_=data_.width()-1;
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if (y_ >= data_.height()) x_=data_.height()-1;
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if (x_ + width_ > data_.width()) width_= data_.width() - x_;
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if (y_ + height_ > data_.height()) height_= data_.height() - y_;
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}
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~image_view() {}
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image_view(image_view<T> const& rhs)
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: x_(rhs.x_),
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y_(rhs.y_),
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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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image_view<T> & operator=(image_view<T> const& rhs)
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{
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if (&rhs==this) return *this;
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x_ = rhs.x_;
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y_ = rhs.y_;
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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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}
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inline unsigned x() const
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{
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return x_;
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}
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inline unsigned y() const
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{
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return y_;
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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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inline const pixel_type* getRow(unsigned row) const
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{
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return data_.getRow(row + y_) + x_;
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}
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inline T& data()
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{
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return data_;
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}
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inline T const& data() const
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{
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return data_;
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}
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private:
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unsigned x_;
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unsigned y_;
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unsigned width_;
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unsigned height_;
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T const& data_;
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};
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}
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#endif // IMAGE_VIEW_HPP
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