97 lines
2.3 KiB
C++
97 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "gfxRect.h"
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#include "nsMathUtils.h"
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#include "mozilla/gfx/Matrix.h"
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#include "gfxQuad.h"
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gfxQuad
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gfxRect::TransformToQuad(const mozilla::gfx::Matrix4x4 &aMatrix) const
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{
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gfxPoint points[4];
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points[0] = TopLeft();
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points[1] = TopRight();
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points[2] = BottomRight();
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points[3] = BottomLeft();
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points[0].Transform(aMatrix);
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points[1].Transform(aMatrix);
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points[2].Transform(aMatrix);
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points[3].Transform(aMatrix);
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// Could this ever result in lines that intersect? I don't think so.
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return gfxQuad(points[0], points[1], points[2], points[3]);
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}
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static bool
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WithinEpsilonOfInteger(gfxFloat aX, gfxFloat aEpsilon)
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{
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return fabs(NS_round(aX) - aX) <= fabs(aEpsilon);
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}
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bool
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gfxRect::WithinEpsilonOfIntegerPixels(gfxFloat aEpsilon) const
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{
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NS_ASSERTION(-0.5 < aEpsilon && aEpsilon < 0.5, "Nonsense epsilon value");
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return (WithinEpsilonOfInteger(x, aEpsilon) &&
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WithinEpsilonOfInteger(y, aEpsilon) &&
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WithinEpsilonOfInteger(width, aEpsilon) &&
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WithinEpsilonOfInteger(height, aEpsilon));
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}
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/* Clamp r to CAIRO_COORD_MIN .. CAIRO_COORD_MAX
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* these are to be device coordinates.
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*
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* Cairo is currently using 24.8 fixed point,
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* so -2^24 .. 2^24-1 is our valid
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*/
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#define CAIRO_COORD_MAX (16777215.0)
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#define CAIRO_COORD_MIN (-16777216.0)
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void
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gfxRect::Condition()
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{
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// if either x or y is way out of bounds;
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// note that we don't handle negative w/h here
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if (x > CAIRO_COORD_MAX) {
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x = CAIRO_COORD_MAX;
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width = 0.0;
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}
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if (y > CAIRO_COORD_MAX) {
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y = CAIRO_COORD_MAX;
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height = 0.0;
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}
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if (x < CAIRO_COORD_MIN) {
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width += x - CAIRO_COORD_MIN;
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if (width < 0.0)
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width = 0.0;
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x = CAIRO_COORD_MIN;
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}
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if (y < CAIRO_COORD_MIN) {
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height += y - CAIRO_COORD_MIN;
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if (height < 0.0)
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height = 0.0;
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y = CAIRO_COORD_MIN;
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}
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if (x + width > CAIRO_COORD_MAX) {
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width = CAIRO_COORD_MAX - x;
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}
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if (y + height > CAIRO_COORD_MAX) {
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height = CAIRO_COORD_MAX - y;
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}
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}
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