1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/thebes/gfxRect.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,73 @@
1.4 +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "gfxRect.h"
1.10 +
1.11 +#include "nsMathUtils.h"
1.12 +
1.13 +static bool
1.14 +WithinEpsilonOfInteger(gfxFloat aX, gfxFloat aEpsilon)
1.15 +{
1.16 + return fabs(NS_round(aX) - aX) <= fabs(aEpsilon);
1.17 +}
1.18 +
1.19 +bool
1.20 +gfxRect::WithinEpsilonOfIntegerPixels(gfxFloat aEpsilon) const
1.21 +{
1.22 + NS_ASSERTION(-0.5 < aEpsilon && aEpsilon < 0.5, "Nonsense epsilon value");
1.23 + return (WithinEpsilonOfInteger(x, aEpsilon) &&
1.24 + WithinEpsilonOfInteger(y, aEpsilon) &&
1.25 + WithinEpsilonOfInteger(width, aEpsilon) &&
1.26 + WithinEpsilonOfInteger(height, aEpsilon));
1.27 +}
1.28 +
1.29 +/* Clamp r to CAIRO_COORD_MIN .. CAIRO_COORD_MAX
1.30 + * these are to be device coordinates.
1.31 + *
1.32 + * Cairo is currently using 24.8 fixed point,
1.33 + * so -2^24 .. 2^24-1 is our valid
1.34 + */
1.35 +
1.36 +#define CAIRO_COORD_MAX (16777215.0)
1.37 +#define CAIRO_COORD_MIN (-16777216.0)
1.38 +
1.39 +void
1.40 +gfxRect::Condition()
1.41 +{
1.42 + // if either x or y is way out of bounds;
1.43 + // note that we don't handle negative w/h here
1.44 + if (x > CAIRO_COORD_MAX) {
1.45 + x = CAIRO_COORD_MAX;
1.46 + width = 0.0;
1.47 + }
1.48 +
1.49 + if (y > CAIRO_COORD_MAX) {
1.50 + y = CAIRO_COORD_MAX;
1.51 + height = 0.0;
1.52 + }
1.53 +
1.54 + if (x < CAIRO_COORD_MIN) {
1.55 + width += x - CAIRO_COORD_MIN;
1.56 + if (width < 0.0)
1.57 + width = 0.0;
1.58 + x = CAIRO_COORD_MIN;
1.59 + }
1.60 +
1.61 + if (y < CAIRO_COORD_MIN) {
1.62 + height += y - CAIRO_COORD_MIN;
1.63 + if (height < 0.0)
1.64 + height = 0.0;
1.65 + y = CAIRO_COORD_MIN;
1.66 + }
1.67 +
1.68 + if (x + width > CAIRO_COORD_MAX) {
1.69 + width = CAIRO_COORD_MAX - x;
1.70 + }
1.71 +
1.72 + if (y + height > CAIRO_COORD_MAX) {
1.73 + height = CAIRO_COORD_MAX - y;
1.74 + }
1.75 +}
1.76 +
