1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/effects/SkCornerPathEffect.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,138 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2006 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#include "SkCornerPathEffect.h"
1.14 +#include "SkPath.h"
1.15 +#include "SkPoint.h"
1.16 +#include "SkReadBuffer.h"
1.17 +#include "SkWriteBuffer.h"
1.18 +
1.19 +SkCornerPathEffect::SkCornerPathEffect(SkScalar radius) : fRadius(radius) {}
1.20 +SkCornerPathEffect::~SkCornerPathEffect() {}
1.21 +
1.22 +static bool ComputeStep(const SkPoint& a, const SkPoint& b, SkScalar radius,
1.23 + SkPoint* step) {
1.24 + SkScalar dist = SkPoint::Distance(a, b);
1.25 +
1.26 + step->set(b.fX - a.fX, b.fY - a.fY);
1.27 +
1.28 + if (dist <= radius * 2) {
1.29 + step->scale(SK_ScalarHalf);
1.30 + return false;
1.31 + } else {
1.32 + step->scale(SkScalarDiv(radius, dist));
1.33 + return true;
1.34 + }
1.35 +}
1.36 +
1.37 +bool SkCornerPathEffect::filterPath(SkPath* dst, const SkPath& src,
1.38 + SkStrokeRec*, const SkRect*) const {
1.39 + if (0 == fRadius) {
1.40 + return false;
1.41 + }
1.42 +
1.43 + SkPath::Iter iter(src, false);
1.44 + SkPath::Verb verb, prevVerb = (SkPath::Verb)-1;
1.45 + SkPoint pts[4];
1.46 +
1.47 + bool closed;
1.48 + SkPoint moveTo, lastCorner;
1.49 + SkVector firstStep, step;
1.50 + bool prevIsValid = true;
1.51 +
1.52 + // to avoid warnings
1.53 + moveTo.set(0, 0);
1.54 + firstStep.set(0, 0);
1.55 + lastCorner.set(0, 0);
1.56 +
1.57 + for (;;) {
1.58 + switch (verb = iter.next(pts, false)) {
1.59 + case SkPath::kMove_Verb:
1.60 + // close out the previous (open) contour
1.61 + if (SkPath::kLine_Verb == prevVerb) {
1.62 + dst->lineTo(lastCorner);
1.63 + }
1.64 + closed = iter.isClosedContour();
1.65 + if (closed) {
1.66 + moveTo = pts[0];
1.67 + prevIsValid = false;
1.68 + } else {
1.69 + dst->moveTo(pts[0]);
1.70 + prevIsValid = true;
1.71 + }
1.72 + break;
1.73 + case SkPath::kLine_Verb: {
1.74 + bool drawSegment = ComputeStep(pts[0], pts[1], fRadius, &step);
1.75 + // prev corner
1.76 + if (!prevIsValid) {
1.77 + dst->moveTo(moveTo + step);
1.78 + prevIsValid = true;
1.79 + } else {
1.80 + dst->quadTo(pts[0].fX, pts[0].fY, pts[0].fX + step.fX,
1.81 + pts[0].fY + step.fY);
1.82 + }
1.83 + if (drawSegment) {
1.84 + dst->lineTo(pts[1].fX - step.fX, pts[1].fY - step.fY);
1.85 + }
1.86 + lastCorner = pts[1];
1.87 + prevIsValid = true;
1.88 + break;
1.89 + }
1.90 + case SkPath::kQuad_Verb:
1.91 + // TBD - just replicate the curve for now
1.92 + if (!prevIsValid) {
1.93 + dst->moveTo(pts[0]);
1.94 + prevIsValid = true;
1.95 + }
1.96 + dst->quadTo(pts[1], pts[2]);
1.97 + lastCorner = pts[2];
1.98 + firstStep.set(0, 0);
1.99 + break;
1.100 + case SkPath::kCubic_Verb:
1.101 + if (!prevIsValid) {
1.102 + dst->moveTo(pts[0]);
1.103 + prevIsValid = true;
1.104 + }
1.105 + // TBD - just replicate the curve for now
1.106 + dst->cubicTo(pts[1], pts[2], pts[3]);
1.107 + lastCorner = pts[3];
1.108 + firstStep.set(0, 0);
1.109 + break;
1.110 + case SkPath::kClose_Verb:
1.111 + if (firstStep.fX || firstStep.fY) {
1.112 + dst->quadTo(lastCorner.fX, lastCorner.fY,
1.113 + lastCorner.fX + firstStep.fX,
1.114 + lastCorner.fY + firstStep.fY);
1.115 + }
1.116 + dst->close();
1.117 + break;
1.118 + case SkPath::kConic_Verb:
1.119 + SkASSERT(0);
1.120 + break;
1.121 + case SkPath::kDone_Verb:
1.122 + goto DONE;
1.123 + }
1.124 +
1.125 + if (SkPath::kMove_Verb == prevVerb) {
1.126 + firstStep = step;
1.127 + }
1.128 + prevVerb = verb;
1.129 + }
1.130 +DONE:
1.131 + return true;
1.132 +}
1.133 +
1.134 +void SkCornerPathEffect::flatten(SkWriteBuffer& buffer) const {
1.135 + this->INHERITED::flatten(buffer);
1.136 + buffer.writeScalar(fRadius);
1.137 +}
1.138 +
1.139 +SkCornerPathEffect::SkCornerPathEffect(SkReadBuffer& buffer) {
1.140 + fRadius = buffer.readScalar();
1.141 +}
