michael@0: /*
michael@0:  * Copyright 2012 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: #ifndef SkPathOpsCurve_DEFINE
michael@0: #define SkPathOpsCurve_DEFINE
michael@0: 
michael@0: #include "SkPathOpsCubic.h"
michael@0: #include "SkPathOpsLine.h"
michael@0: #include "SkPathOpsQuad.h"
michael@0: 
michael@0: static SkDPoint dline_xy_at_t(const SkPoint a[2], double t) {
michael@0:     SkDLine line;
michael@0:     line.set(a);
michael@0:     return line.ptAtT(t);
michael@0: }
michael@0: 
michael@0: static SkDPoint dquad_xy_at_t(const SkPoint a[3], double t) {
michael@0:     SkDQuad quad;
michael@0:     quad.set(a);
michael@0:     return quad.ptAtT(t);
michael@0: }
michael@0: 
michael@0: static SkDPoint dcubic_xy_at_t(const SkPoint a[4], double t) {
michael@0:     SkDCubic cubic;
michael@0:     cubic.set(a);
michael@0:     return cubic.ptAtT(t);
michael@0: }
michael@0: 
michael@0: static SkDPoint (* const CurveDPointAtT[])(const SkPoint[], double ) = {
michael@0:     NULL,
michael@0:     dline_xy_at_t,
michael@0:     dquad_xy_at_t,
michael@0:     dcubic_xy_at_t
michael@0: };
michael@0: 
michael@0: static SkPoint fline_xy_at_t(const SkPoint a[2], double t) {
michael@0:     return dline_xy_at_t(a, t).asSkPoint();
michael@0: }
michael@0: 
michael@0: static SkPoint fquad_xy_at_t(const SkPoint a[3], double t) {
michael@0:     return dquad_xy_at_t(a, t).asSkPoint();
michael@0: }
michael@0: 
michael@0: static SkPoint fcubic_xy_at_t(const SkPoint a[4], double t) {
michael@0:     return dcubic_xy_at_t(a, t).asSkPoint();
michael@0: }
michael@0: 
michael@0: static SkPoint (* const CurvePointAtT[])(const SkPoint[], double ) = {
michael@0:     NULL,
michael@0:     fline_xy_at_t,
michael@0:     fquad_xy_at_t,
michael@0:     fcubic_xy_at_t
michael@0: };
michael@0: 
michael@0: static SkDVector dline_dxdy_at_t(const SkPoint a[2], double ) {
michael@0:     SkDLine line;
michael@0:     line.set(a);
michael@0:     return line[1] - line[0];
michael@0: }
michael@0: 
michael@0: static SkDVector dquad_dxdy_at_t(const SkPoint a[3], double t) {
michael@0:     SkDQuad quad;
michael@0:     quad.set(a);
michael@0:     return quad.dxdyAtT(t);
michael@0: }
michael@0: 
michael@0: static SkDVector dcubic_dxdy_at_t(const SkPoint a[4], double t) {
michael@0:     SkDCubic cubic;
michael@0:     cubic.set(a);
michael@0:     return cubic.dxdyAtT(t);
michael@0: }
michael@0: 
michael@0: static SkDVector (* const CurveDSlopeAtT[])(const SkPoint[], double ) = {
michael@0:     NULL,
michael@0:     dline_dxdy_at_t,
michael@0:     dquad_dxdy_at_t,
michael@0:     dcubic_dxdy_at_t
michael@0: };
michael@0: 
michael@0: static SkVector fline_dxdy_at_t(const SkPoint a[2], double ) {
michael@0:     return a[1] - a[0];
michael@0: }
michael@0: 
michael@0: static SkVector fquad_dxdy_at_t(const SkPoint a[3], double t) {
michael@0:     return dquad_dxdy_at_t(a, t).asSkVector();
michael@0: }
michael@0: 
michael@0: static SkVector fcubic_dxdy_at_t(const SkPoint a[4], double t) {
michael@0:     return dcubic_dxdy_at_t(a, t).asSkVector();
michael@0: }
michael@0: 
michael@0: static SkVector (* const CurveSlopeAtT[])(const SkPoint[], double ) = {
michael@0:     NULL,
michael@0:     fline_dxdy_at_t,
michael@0:     fquad_dxdy_at_t,
michael@0:     fcubic_dxdy_at_t
michael@0: };
michael@0: 
michael@0: static SkPoint quad_top(const SkPoint a[3], double startT, double endT) {
michael@0:     SkDQuad quad;
michael@0:     quad.set(a);
michael@0:     SkDPoint topPt = quad.top(startT, endT);
michael@0:     return topPt.asSkPoint();
michael@0: }
michael@0: 
michael@0: static SkPoint cubic_top(const SkPoint a[4], double startT, double endT) {
michael@0:     SkDCubic cubic;
michael@0:     cubic.set(a);
michael@0:     SkDPoint topPt = cubic.top(startT, endT);
michael@0:     return topPt.asSkPoint();
michael@0: }
michael@0: 
michael@0: static SkPoint (* const CurveTop[])(const SkPoint[], double , double ) = {
michael@0:     NULL,
michael@0:     NULL,
michael@0:     quad_top,
michael@0:     cubic_top
michael@0: };
michael@0: 
michael@0: static bool line_is_vertical(const SkPoint a[2], double startT, double endT) {
michael@0:     SkDLine line;
michael@0:     line.set(a);
michael@0:     SkDPoint dst[2] = { line.ptAtT(startT), line.ptAtT(endT) };
michael@0:     return AlmostEqualUlps(dst[0].fX, dst[1].fX);
michael@0: }
michael@0: 
michael@0: static bool quad_is_vertical(const SkPoint a[3], double startT, double endT) {
michael@0:     SkDQuad quad;
michael@0:     quad.set(a);
michael@0:     SkDQuad dst = quad.subDivide(startT, endT);
michael@0:     return AlmostEqualUlps(dst[0].fX, dst[1].fX) && AlmostEqualUlps(dst[1].fX, dst[2].fX);
michael@0: }
michael@0: 
michael@0: static bool cubic_is_vertical(const SkPoint a[4], double startT, double endT) {
michael@0:     SkDCubic cubic;
michael@0:     cubic.set(a);
michael@0:     SkDCubic dst = cubic.subDivide(startT, endT);
michael@0:     return AlmostEqualUlps(dst[0].fX, dst[1].fX) && AlmostEqualUlps(dst[1].fX, dst[2].fX)
michael@0:             && AlmostEqualUlps(dst[2].fX, dst[3].fX);
michael@0: }
michael@0: 
michael@0: static bool (* const CurveIsVertical[])(const SkPoint[], double , double) = {
michael@0:     NULL,
michael@0:     line_is_vertical,
michael@0:     quad_is_vertical,
michael@0:     cubic_is_vertical
michael@0: };
michael@0: 
michael@0: #endif