gecko/gfx/thebes/gfxRect.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Novell code.
*
* The Initial Developer of the Original Code is Novell Corporation.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Robert O'Callahan (rocallahan@novell.com)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "gfxRect.h"
#include "nsMathUtils.h"
static bool
WithinEpsilonOfInteger(gfxFloat aX, gfxFloat aEpsilon)
{
return fabs(NS_round(aX) - aX) <= fabs(aEpsilon);
}
bool
gfxRect::WithinEpsilonOfIntegerPixels(gfxFloat aEpsilon) const
{
NS_ASSERTION(-0.5 < aEpsilon && aEpsilon < 0.5, "Nonsense epsilon value");
return (WithinEpsilonOfInteger(x, aEpsilon) &&
WithinEpsilonOfInteger(y, aEpsilon) &&
WithinEpsilonOfInteger(width, aEpsilon) &&
WithinEpsilonOfInteger(height, aEpsilon));
}
/* Clamp r to CAIRO_COORD_MIN .. CAIRO_COORD_MAX
* these are to be device coordinates.
*
* Cairo is currently using 24.8 fixed point,
* so -2^24 .. 2^24-1 is our valid
*/
#define CAIRO_COORD_MAX (16777215.0)
#define CAIRO_COORD_MIN (-16777216.0)
void
gfxRect::Condition()
{
// if either x or y is way out of bounds;
// note that we don't handle negative w/h here
if (x > CAIRO_COORD_MAX) {
x = CAIRO_COORD_MAX;
width = 0.0;
}
if (y > CAIRO_COORD_MAX) {
y = CAIRO_COORD_MAX;
height = 0.0;
}
if (x < CAIRO_COORD_MIN) {
width += x - CAIRO_COORD_MIN;
if (width < 0.0)
width = 0.0;
x = CAIRO_COORD_MIN;
}
if (y < CAIRO_COORD_MIN) {
height += y - CAIRO_COORD_MIN;
if (height < 0.0)
height = 0.0;
y = CAIRO_COORD_MIN;
}
if (x + width > CAIRO_COORD_MAX) {
width = CAIRO_COORD_MAX - x;
}
if (y + height > CAIRO_COORD_MAX) {
height = CAIRO_COORD_MAX - y;
}
}