mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-29 15:52:07 +00:00
126bd9e1a4
This patch was generated automatically by the "modeline.py" script, available here: https://github.com/amccreight/moz-source-tools/blob/master/modeline.py For every file that is modified in this patch, the changes are as follows: (1) The patch changes the file to use the exact C++ mode lines from the Mozilla coding style guide, available here: https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Coding_Style#Mode_Line (2) The patch deletes any blank lines between the mode line & the MPL boilerplate comment. (3) If the file previously had the mode lines and MPL boilerplate in a single contiguous C++ comment, then the patch splits them into separate C++ comments, to match the boilerplate in the coding style. MozReview-Commit-ID: 77D61xpSmIl --HG-- extra : rebase_source : c6162fa3cf539a07177a19838324bf368faa162b
187 lines
5.3 KiB
C++
187 lines
5.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef mozilla_BezierUtils_h_
|
|
#define mozilla_BezierUtils_h_
|
|
|
|
#include "mozilla/gfx/2D.h"
|
|
#include "gfxRect.h"
|
|
|
|
namespace mozilla {
|
|
namespace gfx {
|
|
|
|
// Control points for bezier curve
|
|
//
|
|
// mPoints[2]
|
|
// +-----___---+ mPoints[3]
|
|
// __--
|
|
// _--
|
|
// /
|
|
// /
|
|
// mPoints[1] + |
|
|
// | |
|
|
// ||
|
|
// ||
|
|
// |
|
|
// |
|
|
// |
|
|
// |
|
|
// mPoints[0] +
|
|
struct Bezier {
|
|
Point mPoints[4];
|
|
};
|
|
|
|
// Calculate a point or it's differential of a bezier curve formed by
|
|
// aBezier and parameter t.
|
|
//
|
|
// GetBezierPoint = P(t)
|
|
// GetBezierDifferential = P'(t)
|
|
// GetBezierDifferential2 = P''(t)
|
|
//
|
|
// mPoints[2]
|
|
// +-----___---+ mPoints[3]
|
|
// __-- P(1)
|
|
// _--
|
|
// +
|
|
// / P(t)
|
|
// mPoints[1] + |
|
|
// | |
|
|
// ||
|
|
// ||
|
|
// |
|
|
// |
|
|
// |
|
|
// |
|
|
// mPoints[0] + P(0)
|
|
Point GetBezierPoint(const Bezier& aBezier, Float t);
|
|
Point GetBezierDifferential(const Bezier& aBezier, Float t);
|
|
Point GetBezierDifferential2(const Bezier& aBezier, Float t);
|
|
|
|
// Calculate length of a simple bezier curve formed by aBezier and range [a, b].
|
|
Float GetBezierLength(const Bezier& aBezier, Float a, Float b);
|
|
|
|
// Split bezier curve formed by aBezier into [0,t1], [t1,t2], [t2,1] parts, and
|
|
// stores control points for [t1,t2] to aSubBezier.
|
|
//
|
|
// ___---+
|
|
// __+- P(1)
|
|
// _-- P(t2)
|
|
// -
|
|
// / <-- aSubBezier
|
|
// |
|
|
// |
|
|
// +
|
|
// | P(t1)
|
|
// |
|
|
// |
|
|
// |
|
|
// |
|
|
// + P(0)
|
|
void GetSubBezier(Bezier* aSubBezier, const Bezier& aBezier,
|
|
Float t1, Float t2);
|
|
|
|
// Find a nearest point on bezier curve formed by aBezier to a point aTarget.
|
|
// aInitialT is a hint to find the parameter t for the nearest point.
|
|
// If aT is non-null, parameter for the nearest point is stored to *aT.
|
|
// This function expects a bezier curve to be an approximation of elliptic arc.
|
|
// Otherwise it will return wrong point.
|
|
//
|
|
// aTarget
|
|
// + ___---+
|
|
// __--
|
|
// _--
|
|
// +
|
|
// / nearest point = P(t = *aT)
|
|
// |
|
|
// |
|
|
// |
|
|
// + P(aInitialT)
|
|
// |
|
|
// |
|
|
// |
|
|
// |
|
|
// +
|
|
Point FindBezierNearestPoint(const Bezier& aBezier, const Point& aTarget,
|
|
Float aInitialT, Float* aT=nullptr);
|
|
|
|
// Calculate control points for a bezier curve that is an approximation of
|
|
// an elliptic arc.
|
|
//
|
|
// aCornerSize.width
|
|
// |<----------------->|
|
|
// | |
|
|
// aCornerPoint| mPoints[2] |
|
|
// -------------+-------+-----___---+ mPoints[3]
|
|
// ^ | __--
|
|
// | | _--
|
|
// | | -
|
|
// | | /
|
|
// aCornerSize.height | mPoints[1] + |
|
|
// | | |
|
|
// | ||
|
|
// | ||
|
|
// | |
|
|
// | |
|
|
// | |
|
|
// v mPoints[0] |
|
|
// -------------+
|
|
void GetBezierPointsForCorner(Bezier* aBezier, mozilla::Corner aCorner,
|
|
const Point& aCornerPoint,
|
|
const Size& aCornerSize);
|
|
|
|
// Calculate the approximate length of a quarter elliptic arc formed by radii
|
|
// (a, b).
|
|
//
|
|
// a
|
|
// |<----------------->|
|
|
// | |
|
|
// ---+-------------___---+
|
|
// ^ | __--
|
|
// | | _--
|
|
// | | -
|
|
// | | /
|
|
// b | | |
|
|
// | | |
|
|
// | ||
|
|
// | ||
|
|
// | |
|
|
// | |
|
|
// | |
|
|
// v |
|
|
// ---+
|
|
Float GetQuarterEllipticArcLength(Float a, Float b);
|
|
|
|
// Calculate the distance between an elliptic arc formed by (origin, width,
|
|
// height), and a point P, along a line formed by |P + n * normal|.
|
|
// P should be outside of the ellipse, and the line should cross with the
|
|
// ellipse twice at n > 0 points.
|
|
//
|
|
// width
|
|
// |<----------------->|
|
|
// origin | |
|
|
// -----------+-------------___---+
|
|
// ^ normal | __--
|
|
// | P +->__ | _--
|
|
// | --__ -
|
|
// | | --+
|
|
// height | | |
|
|
// | | |
|
|
// | ||
|
|
// | ||
|
|
// | |
|
|
// | |
|
|
// | |
|
|
// v |
|
|
// -----------+
|
|
Float CalculateDistanceToEllipticArc(const Point& P, const Point& normal,
|
|
const Point& origin,
|
|
Float width, Float height);
|
|
|
|
} // namespace gfx
|
|
} // namespace mozilla
|
|
|
|
#endif /* mozilla_BezierUtils_h_ */
|