gfx/thebes/src/gfxRect.cpp

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
   2  * ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is Novell code.
  16  *
  17  * The Initial Developer of the Original Code is Novell Corporation.
  18  * Portions created by the Initial Developer are Copyright (C) 2006
  19  * the Initial Developer. All Rights Reserved.
  20  *
  21  * Contributor(s):
  22  *   Robert O'Callahan (rocallahan@novell.com)
  23  *
  24  * Alternatively, the contents of this file may be used under the terms of
  25  * either the GNU General Public License Version 2 or later (the "GPL"), or
  26  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  27  * in which case the provisions of the GPL or the LGPL are applicable instead
  28  * of those above. If you wish to allow use of your version of this file only
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  33  * the provisions above, a recipient may use your version of this file under
  34  * the terms of any one of the MPL, the GPL or the LGPL.
  35  *
  36  * ***** END LICENSE BLOCK ***** */
  37
  38 #include "gfxRect.h"
  39
  40 #include "nsMathUtils.h"
  41
  42 gfxRect
  43 gfxRect::Intersect(const gfxRect& aRect) const
  44 {
  45   gfxRect result(0,0,0,0);
  46
  47   gfxFloat x = PR_MAX(aRect.X(), X());
  48   gfxFloat xmost = PR_MIN(aRect.XMost(), XMost());
  49   if (x >= xmost)
  50     return result;
  51
  52   gfxFloat y = PR_MAX(aRect.Y(), Y());
  53   gfxFloat ymost = PR_MIN(aRect.YMost(), YMost());
  54   if (y >= ymost)
  55     return result;
  56
  57   result = gfxRect(x, y, xmost - x, ymost - y);
  58   return result;
  59 }
  60
  61 gfxRect
  62 gfxRect::Union(const gfxRect& aRect) const
  63 {
  64   if (IsEmpty())
  65     return aRect;
  66   if (aRect.IsEmpty())
  67     return *this;
  68
  69   gfxFloat x = PR_MIN(aRect.X(), X());
  70   gfxFloat xmost = PR_MAX(aRect.XMost(), XMost());
  71   gfxFloat y = PR_MIN(aRect.Y(), Y());
  72   gfxFloat ymost = PR_MAX(aRect.YMost(), YMost());
  73   return gfxRect(x, y, xmost - x, ymost - y);
  74 }
  75
  76 PRBool
  77 gfxRect::Contains(const gfxRect& aRect) const
  78 {
  79   return aRect.X() >= X() && aRect.XMost() <= XMost() &&
  80          aRect.Y() >= Y() && aRect.YMost() <= YMost();
  81 }
  82
  83 void
  84 gfxRect::Round()
  85 {
  86     // Note that don't use NS_round here. See the comment for this method in gfxRect.h
  87     gfxFloat x0 = NS_floor(X() + 0.5);
  88     gfxFloat y0 = NS_floor(Y() + 0.5);
  89     gfxFloat x1 = NS_floor(XMost() + 0.5);
  90     gfxFloat y1 = NS_floor(YMost() + 0.5);
  91
  92     pos.x = x0;
  93     pos.y = y0;
  94
  95     size.width = x1 - x0;
  96     size.height = y1 - y0;
  97 }
  98
  99 void
 100 gfxRect::RoundOut()
 101 {
 102     gfxFloat x0 = NS_floor(X());
 103     gfxFloat y0 = NS_floor(Y());
 104     gfxFloat x1 = NS_ceil(XMost());
 105     gfxFloat y1 = NS_ceil(YMost());
 106
 107     pos.x = x0;
 108     pos.y = y0;
 109
 110     size.width = x1 - x0;
 111     size.height = y1 - y0;
 112 }
 113
 114 /* Clamp r to CAIRO_COORD_MIN .. CAIRO_COORD_MAX
 115  * these are to be device coordinates.
 116  *
 117  * Cairo is currently using 24.8 fixed point,
 118  * so -2^24 .. 2^24-1 is our valid
 119  */
 120
 121 #define CAIRO_COORD_MAX (16777215.0)
 122 #define CAIRO_COORD_MIN (-16777216.0)
 123
 124 void
 125 gfxRect::Condition()
 126 {
 127     // if either x or y is way out of bounds;
 128     // note that we don't handle negative w/h here
 129     if (pos.x > CAIRO_COORD_MAX) {
 130         pos.x = CAIRO_COORD_MAX;
 131         size.width = 0.0;
 132     }
 133
 134     if (pos.y > CAIRO_COORD_MAX) {
 135         pos.y = CAIRO_COORD_MAX;
 136         size.height = 0.0;
 137     }
 138
 139     if (pos.x < CAIRO_COORD_MIN) {
 140         size.width += pos.x - CAIRO_COORD_MIN;
 141         if (size.width < 0.0)
 142             size.width = 0.0;
 143         pos.x = CAIRO_COORD_MIN;
 144     }
 145
 146     if (pos.y < CAIRO_COORD_MIN) {
 147         size.height += pos.y - CAIRO_COORD_MIN;
 148         if (size.height < 0.0)
 149             size.height = 0.0;
 150         pos.y = CAIRO_COORD_MIN;
 151     }
 152
 153     if (pos.x + size.width > CAIRO_COORD_MAX) {
 154         size.width = CAIRO_COORD_MAX - pos.x;
 155     }
 156
 157     if (pos.y + size.height > CAIRO_COORD_MAX) {
 158         size.height = CAIRO_COORD_MAX - pos.y;
 159     }
 160 }