libcore/SWFRect.cpp

   1 //
   2 //   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
   3 //   Free Software Foundation, Inc
   4 //
   5 // This program is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with this program; if not, write to the Free Software
  17 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18
  19 #include "SWFRect.h"
  20
  21 #include <sstream>
  22
  23 #include "SWFMatrix.h"
  24 #include "Point2d.h"
  25 #include "GnashNumeric.h" // for flerp, clamp...
  26
  27
  28 namespace gnash {
  29
  30 // Set ourself to bound a rectangle that has been transformed by m.
  31 void
  32 SWFRect::enclose_transformed_rect(const SWFMatrix& m, const SWFRect& r)
  33 {
  34     std::int32_t  x1 = r.get_x_min();
  35     std::int32_t  y1 = r.get_y_min();
  36     std::int32_t  x2 = r.get_x_max();
  37     std::int32_t  y2 = r.get_y_max();
  38
  39     point  p0(x1, y1);
  40     point  p1(x2, y1);
  41     point  p2(x2, y2);
  42     point  p3(x1, y2);
  43
  44     m.transform(p0);
  45     m.transform(p1);
  46     m.transform(p2);
  47     m.transform(p3);
  48
  49     set_to_point(p0.x, p0.y);
  50     expand_to(p1.x, p1.y);
  51     expand_to(p2.x, p2.y);
  52     expand_to(p3.x, p3.y);
  53 }
  54
  55 void
  56 SWFRect::expand_to_rect(const SWFRect& r)
  57 // Expand ourself to enclose the given SWFRect.
  58 {
  59     if( r.is_null() ) {
  60         return;
  61     }
  62
  63     if( is_null() ) {
  64         *this = r;
  65     }else {
  66         _xMin = std::min(_xMin, r.get_x_min());
  67         _yMin = std::min(_yMin, r.get_y_min());
  68         _xMax = std::max(_xMax, r.get_x_max());
  69         _yMax = std::max(_yMax, r.get_y_max());
  70     }
  71 }
  72
  73 void
  74 SWFRect::expand_to_transformed_rect(const SWFMatrix& m, const SWFRect& r)
  75 {
  76     if (r.is_null()) {
  77          return;
  78     }
  79
  80     const std::int32_t x1 = r.get_x_min();
  81     const std::int32_t y1 = r.get_y_min();
  82     const std::int32_t x2 = r.get_x_max();
  83     const std::int32_t y2 = r.get_y_max();
  84
  85     point p0(x1, y1);
  86     point p1(x2, y1);
  87     point p2(x2, y2);
  88     point p3(x1, y2);
  89
  90     m.transform(p0);
  91     m.transform(p1);
  92     m.transform(p2);
  93     m.transform(p3);
  94
  95     if (is_null()) {
  96         set_to_point(p0.x, p0.y);
  97     }
  98     else {
  99         expand_to(p0.x, p0.y);
 100     }
 101     expand_to(p1.x, p1.y);
 102     expand_to(p2.x, p2.y);
 103     expand_to(p3.x, p3.y);
 104 }
 105
 106 void
 107 SWFRect::set_lerp(const SWFRect& a, const SWFRect& b, float t)
 108 // Set this to the lerp of a and b.
 109 {
 110     assert( !a.is_null() );
 111     assert( !b.is_null() );
 112
 113     _xMin = lerp<float>(a.get_x_min(), b.get_x_min(), t);
 114     _yMin = lerp<float>(a.get_y_min(), b.get_y_min(), t);
 115     _xMax = lerp<float>(a.get_x_max(), b.get_x_max(), t);
 116     _yMax = lerp<float>(a.get_y_max(), b.get_y_max(), t);
 117 }
 118
 119 void
 120 SWFRect::clamp(point& p) const
 121 {
 122     assert( !is_null() );
 123     p.x = gnash::clamp<std::int32_t>(p.x, _xMin, _xMax);
 124     p.y = gnash::clamp<std::int32_t>(p.y, _yMin, _yMax);
 125 }
 126
 127 std::string
 128 SWFRect::toString() const
 129 {
 130     std::stringstream ss;
 131     ss << *this;
 132     return ss.str();
 133 }
 134
 135 }   // end namespace gnash
 136
 137
 138 // Local Variables:
 139 // mode: C++
 140 // c-basic-offset: 8
 141 // tab-width: 8
 142 // indent-tabs-mode: t
 143 // End: