gfx/thebes/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
  29  * under the terms of either the GPL or the LGPL, and not to allow others to
  30  * use your version of this file under the terms of the MPL, indicate your
  31  * decision by deleting the provisions above and replace them with the notice
  32  * and other provisions required by the GPL or the LGPL. If you do not delete
  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 PRBool
  84 gfxRect::Contains(const gfxPoint& aPoint) const
  85 {
  86   return aPoint.x >= X() && aPoint.x <= XMost() &&
  87          aPoint.y >= Y() && aPoint.y <= YMost();
  88 }
  89
  90 void
  91 gfxRect::Round()
  92 {
  93     // Note that don't use NS_round here. See the comment for this method in gfxRect.h
  94     gfxFloat x0 = NS_floor(X() + 0.5);
  95     gfxFloat y0 = NS_floor(Y() + 0.5);
  96     gfxFloat x1 = NS_floor(XMost() + 0.5);
  97     gfxFloat y1 = NS_floor(YMost() + 0.5);
  98
  99     pos.x = x0;
 100     pos.y = y0;
 101
 102     size.width = x1 - x0;
 103     size.height = y1 - y0;
 104 }
 105
 106 void
 107 gfxRect::RoundIn()
 108 {
 109     gfxFloat x0 = NS_ceil(X());
 110     gfxFloat y0 = NS_ceil(Y());
 111     gfxFloat x1 = NS_floor(XMost());
 112     gfxFloat y1 = NS_floor(YMost());
 113
 114     pos.x = x0;
 115     pos.y = y0;
 116
 117     size.width = x1 - x0;
 118     size.height = y1 - y0;
 119 }
 120
 121 void
 122 gfxRect::RoundOut()
 123 {
 124     gfxFloat x0 = NS_floor(X());
 125     gfxFloat y0 = NS_floor(Y());
 126     gfxFloat x1 = NS_ceil(XMost());
 127     gfxFloat y1 = NS_ceil(YMost());
 128
 129     pos.x = x0;
 130     pos.y = y0;
 131
 132     size.width = x1 - x0;
 133     size.height = y1 - y0;
 134 }
 135
 136 /* Clamp r to CAIRO_COORD_MIN .. CAIRO_COORD_MAX
 137  * these are to be device coordinates.
 138  *
 139  * Cairo is currently using 24.8 fixed point,
 140  * so -2^24 .. 2^24-1 is our valid
 141  */
 142
 143 #define CAIRO_COORD_MAX (16777215.0)
 144 #define CAIRO_COORD_MIN (-16777216.0)
 145
 146 void
 147 gfxRect::Condition()
 148 {
 149     // if either x or y is way out of bounds;
 150     // note that we don't handle negative w/h here
 151     if (pos.x > CAIRO_COORD_MAX) {
 152         pos.x = CAIRO_COORD_MAX;
 153         size.width = 0.0;
 154     }
 155
 156     if (pos.y > CAIRO_COORD_MAX) {
 157         pos.y = CAIRO_COORD_MAX;
 158         size.height = 0.0;
 159     }
 160
 161     if (pos.x < CAIRO_COORD_MIN) {
 162         size.width += pos.x - CAIRO_COORD_MIN;
 163         if (size.width < 0.0)
 164             size.width = 0.0;
 165         pos.x = CAIRO_COORD_MIN;
 166     }
 167
 168     if (pos.y < CAIRO_COORD_MIN) {
 169         size.height += pos.y - CAIRO_COORD_MIN;
 170         if (size.height < 0.0)
 171             size.height = 0.0;
 172         pos.y = CAIRO_COORD_MIN;
 173     }
 174
 175     if (pos.x + size.width > CAIRO_COORD_MAX) {
 176         size.width = CAIRO_COORD_MAX - pos.x;
 177     }
 178
 179     if (pos.y + size.height > CAIRO_COORD_MAX) {
 180         size.height = CAIRO_COORD_MAX - pos.y;
 181     }
 182 }