• file
• revisions
• annotate
• diff
• comparison
• raw

gfx/skia/trunk/src/pathops/SkPathOpsCurve.h@6474c204b198 (annotated)

gfx/skia/trunk/src/pathops/SkPathOpsCurve.h

Wed, 31 Dec 2014 06:09:35 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 06:09:35 +0100

changeset 0

6474c204b198

permissions

-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0	1	/*
michael@0	2	* Copyright 2012 Google Inc.
michael@0	3	*
michael@0	4	* Use of this source code is governed by a BSD-style license that can be
michael@0	5	* found in the LICENSE file.
michael@0	6	*/
michael@0	7	#ifndef SkPathOpsCurve_DEFINE
michael@0	8	#define SkPathOpsCurve_DEFINE
michael@0	9
michael@0	10	#include "SkPathOpsCubic.h"
michael@0	11	#include "SkPathOpsLine.h"
michael@0	12	#include "SkPathOpsQuad.h"
michael@0	13
michael@0	14	static SkDPoint dline_xy_at_t(const SkPoint a[2], double t) {
michael@0	15	SkDLine line;
michael@0	16	line.set(a);
michael@0	17	return line.ptAtT(t);
michael@0	18	}
michael@0	19
michael@0	20	static SkDPoint dquad_xy_at_t(const SkPoint a[3], double t) {
michael@0	21	SkDQuad quad;
michael@0	22	quad.set(a);
michael@0	23	return quad.ptAtT(t);
michael@0	24	}
michael@0	25
michael@0	26	static SkDPoint dcubic_xy_at_t(const SkPoint a[4], double t) {
michael@0	27	SkDCubic cubic;
michael@0	28	cubic.set(a);
michael@0	29	return cubic.ptAtT(t);
michael@0	30	}
michael@0	31
michael@0	32	static SkDPoint (* const CurveDPointAtT[])(const SkPoint[], double ) = {
michael@0	33	NULL,
michael@0	34	dline_xy_at_t,
michael@0	35	dquad_xy_at_t,
michael@0	36	dcubic_xy_at_t
michael@0	37	};
michael@0	38
michael@0	39	static SkPoint fline_xy_at_t(const SkPoint a[2], double t) {
michael@0	40	return dline_xy_at_t(a, t).asSkPoint();
michael@0	41	}
michael@0	42
michael@0	43	static SkPoint fquad_xy_at_t(const SkPoint a[3], double t) {
michael@0	44	return dquad_xy_at_t(a, t).asSkPoint();
michael@0	45	}
michael@0	46
michael@0	47	static SkPoint fcubic_xy_at_t(const SkPoint a[4], double t) {
michael@0	48	return dcubic_xy_at_t(a, t).asSkPoint();
michael@0	49	}
michael@0	50
michael@0	51	static SkPoint (* const CurvePointAtT[])(const SkPoint[], double ) = {
michael@0	52	NULL,
michael@0	53	fline_xy_at_t,
michael@0	54	fquad_xy_at_t,
michael@0	55	fcubic_xy_at_t
michael@0	56	};
michael@0	57
michael@0	58	static SkDVector dline_dxdy_at_t(const SkPoint a[2], double ) {
michael@0	59	SkDLine line;
michael@0	60	line.set(a);
michael@0	61	return line[1] - line[0];
michael@0	62	}
michael@0	63
michael@0	64	static SkDVector dquad_dxdy_at_t(const SkPoint a[3], double t) {
michael@0	65	SkDQuad quad;
michael@0	66	quad.set(a);
michael@0	67	return quad.dxdyAtT(t);
michael@0	68	}
michael@0	69
michael@0	70	static SkDVector dcubic_dxdy_at_t(const SkPoint a[4], double t) {
michael@0	71	SkDCubic cubic;
michael@0	72	cubic.set(a);
michael@0	73	return cubic.dxdyAtT(t);
michael@0	74	}
michael@0	75
michael@0	76	static SkDVector (* const CurveDSlopeAtT[])(const SkPoint[], double ) = {
michael@0	77	NULL,
michael@0	78	dline_dxdy_at_t,
michael@0	79	dquad_dxdy_at_t,
michael@0	80	dcubic_dxdy_at_t
michael@0	81	};
michael@0	82
michael@0	83	static SkVector fline_dxdy_at_t(const SkPoint a[2], double ) {
michael@0	84	return a[1] - a[0];
michael@0	85	}
michael@0	86
michael@0	87	static SkVector fquad_dxdy_at_t(const SkPoint a[3], double t) {
michael@0	88	return dquad_dxdy_at_t(a, t).asSkVector();
michael@0	89	}
michael@0	90
michael@0	91	static SkVector fcubic_dxdy_at_t(const SkPoint a[4], double t) {
michael@0	92	return dcubic_dxdy_at_t(a, t).asSkVector();
michael@0	93	}
michael@0	94
michael@0	95	static SkVector (* const CurveSlopeAtT[])(const SkPoint[], double ) = {
michael@0	96	NULL,
michael@0	97	fline_dxdy_at_t,
michael@0	98	fquad_dxdy_at_t,
michael@0	99	fcubic_dxdy_at_t
michael@0	100	};
michael@0	101
michael@0	102	static SkPoint quad_top(const SkPoint a[3], double startT, double endT) {
michael@0	103	SkDQuad quad;
michael@0	104	quad.set(a);
michael@0	105	SkDPoint topPt = quad.top(startT, endT);
michael@0	106	return topPt.asSkPoint();
michael@0	107	}
michael@0	108
michael@0	109	static SkPoint cubic_top(const SkPoint a[4], double startT, double endT) {
michael@0	110	SkDCubic cubic;
michael@0	111	cubic.set(a);
michael@0	112	SkDPoint topPt = cubic.top(startT, endT);
michael@0	113	return topPt.asSkPoint();
michael@0	114	}
michael@0	115
michael@0	116	static SkPoint (* const CurveTop[])(const SkPoint[], double , double ) = {
michael@0	117	NULL,
michael@0	118	NULL,
michael@0	119	quad_top,
michael@0	120	cubic_top
michael@0	121	};
michael@0	122
michael@0	123	static bool line_is_vertical(const SkPoint a[2], double startT, double endT) {
michael@0	124	SkDLine line;
michael@0	125	line.set(a);
michael@0	126	SkDPoint dst[2] = { line.ptAtT(startT), line.ptAtT(endT) };
michael@0	127	return AlmostEqualUlps(dst[0].fX, dst[1].fX);
michael@0	128	}
michael@0	129
michael@0	130	static bool quad_is_vertical(const SkPoint a[3], double startT, double endT) {
michael@0	131	SkDQuad quad;
michael@0	132	quad.set(a);
michael@0	133	SkDQuad dst = quad.subDivide(startT, endT);
michael@0	134	return AlmostEqualUlps(dst[0].fX, dst[1].fX) && AlmostEqualUlps(dst[1].fX, dst[2].fX);
michael@0	135	}
michael@0	136
michael@0	137	static bool cubic_is_vertical(const SkPoint a[4], double startT, double endT) {
michael@0	138	SkDCubic cubic;
michael@0	139	cubic.set(a);
michael@0	140	SkDCubic dst = cubic.subDivide(startT, endT);
michael@0	141	return AlmostEqualUlps(dst[0].fX, dst[1].fX) && AlmostEqualUlps(dst[1].fX, dst[2].fX)
michael@0	142	&& AlmostEqualUlps(dst[2].fX, dst[3].fX);
michael@0	143	}
michael@0	144
michael@0	145	static bool (* const CurveIsVertical[])(const SkPoint[], double , double) = {
michael@0	146	NULL,
michael@0	147	line_is_vertical,
michael@0	148	quad_is_vertical,
michael@0	149	cubic_is_vertical
michael@0	150	};
michael@0	151
michael@0	152	#endif