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/*
* Copyright (c) 2020 Samsung Electronics Co., Ltd. All rights reserved.
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "vector_vbezier.h"
#include <cmath>
#include "vector_vdasher.h"
#include "vector_vline.h"
V_BEGIN_NAMESPACE
static constexpr float tolerance = 0.1f;
VDasher::VDasher(const float *dashArray, size_t size)
{
mDashArray = reinterpret_cast<const VDasher::Dash *>(dashArray);
mArraySize = size / 2;
if (size % 2) mDashOffset = dashArray[size - 1];
mIndex = 0;
mCurrentLength = 0;
mDiscard = false;
//if the dash array contains ZERO length
// segments or ZERO lengths gaps we could
// optimize those usecase.
for (size_t i = 0; i < mArraySize; i++) {
if (!vCompare(mDashArray[i].length, 0.0f))
mNoLength = false;
if (!vCompare(mDashArray[i].gap, 0.0f))
mNoGap = false;
}
}
void VDasher::moveTo(const VPointF &p)
{
mDiscard = false;
mStartNewSegment = true;
mCurPt = p;
mIndex = 0;
if (!vCompare(mDashOffset, 0.0f)) {
float totalLength = 0.0;
for (size_t i = 0; i < mArraySize; i++) {
totalLength = mDashArray[i].length + mDashArray[i].gap;
}
float normalizeLen = std::fmod(mDashOffset, totalLength);
if (normalizeLen < 0.0f) {
normalizeLen = totalLength + normalizeLen;
}
// now the length is less than total length and +ve
// findout the current dash index , dashlength and gap.
for (size_t i = 0; i < mArraySize; i++) {
if (normalizeLen < mDashArray[i].length) {
mIndex = i;
mCurrentLength = mDashArray[i].length - normalizeLen;
mDiscard = false;
break;
}
normalizeLen -= mDashArray[i].length;
if (normalizeLen < mDashArray[i].gap) {
mIndex = i;
mCurrentLength = mDashArray[i].gap - normalizeLen;
mDiscard = true;
break;
}
normalizeLen -= mDashArray[i].gap;
}
} else {
mCurrentLength = mDashArray[mIndex].length;
}
if (vIsZero(mCurrentLength)) updateActiveSegment();
}
void VDasher::addLine(const VPointF &p)
{
if (mDiscard) return;
if (mStartNewSegment) {
mResult->moveTo(mCurPt);
mStartNewSegment = false;
}
mResult->lineTo(p);
}
void VDasher::updateActiveSegment()
{
mStartNewSegment = true;
if (mDiscard) {
mDiscard = false;
mIndex = (mIndex + 1) % mArraySize;
mCurrentLength = mDashArray[mIndex].length;
} else {
mDiscard = true;
mCurrentLength = mDashArray[mIndex].gap;
}
if (vIsZero(mCurrentLength)) updateActiveSegment();
}
void VDasher::lineTo(const VPointF &p)
{
VLine left, right;
VLine line(mCurPt, p);
float length = line.length();
if (length <= mCurrentLength) {
mCurrentLength -= length;
addLine(p);
} else {
while (length > mCurrentLength) {
length -= mCurrentLength;
line.splitAtLength(mCurrentLength, left, right);
addLine(left.p2());
updateActiveSegment();
line = right;
mCurPt = line.p1();
}
// handle remainder
if (length > tolerance) {
mCurrentLength -= length;
addLine(line.p2());
}
}
if (mCurrentLength < tolerance) updateActiveSegment();
mCurPt = p;
}
void VDasher::addCubic(const VPointF &cp1, const VPointF &cp2, const VPointF &e)
{
if (mDiscard) return;
if (mStartNewSegment) {
mResult->moveTo(mCurPt);
mStartNewSegment = false;
}
mResult->cubicTo(cp1, cp2, e);
}
void VDasher::cubicTo(const VPointF &cp1, const VPointF &cp2, const VPointF &e)
{
VBezier left, right;
VBezier b = VBezier::fromPoints(mCurPt, cp1, cp2, e);
float bezLen = b.length();
if (bezLen <= mCurrentLength) {
mCurrentLength -= bezLen;
addCubic(cp1, cp2, e);
} else {
while (bezLen > mCurrentLength) {
bezLen -= mCurrentLength;
b.splitAtLength(mCurrentLength, &left, &right);
addCubic(left.pt2(), left.pt3(), left.pt4());
updateActiveSegment();
b = right;
mCurPt = b.pt1();
}
// handle remainder
if (bezLen > tolerance) {
mCurrentLength -= bezLen;
addCubic(b.pt2(), b.pt3(), b.pt4());
}
}
if (mCurrentLength < tolerance) updateActiveSegment();
mCurPt = e;
}
void VDasher::dashHelper(const VPath &path, VPath &result)
{
mResult = &result;
mResult->reserve(path.points().size(), path.elements().size());
mIndex = 0;
const std::vector<VPath::Element> &elms = path.elements();
const std::vector<VPointF> & pts = path.points();
const VPointF * ptPtr = pts.data();
for (auto &i : elms) {
switch (i) {
case VPath::Element::MoveTo: {
moveTo(*ptPtr++);
break;
}
case VPath::Element::LineTo: {
lineTo(*ptPtr++);
break;
}
case VPath::Element::CubicTo: {
cubicTo(*ptPtr, *(ptPtr + 1), *(ptPtr + 2));
ptPtr += 3;
break;
}
case VPath::Element::Close: {
// The point is already joined to start point in VPath
// no need to do anything here.
break;
}
}
}
mResult = nullptr;
}
void VDasher::dashed(const VPath &path, VPath &result)
{
if (mNoLength && mNoGap) return result.reset();
if (path.empty() || mNoLength) return result.reset();
if (mNoGap) return result.clone(path);
result.reset();
dashHelper(path, result);
}
VPath VDasher::dashed(const VPath &path)
{
if (mNoLength && mNoGap) return path;
if (path.empty() || mNoLength) return VPath();
if (mNoGap) return path;
VPath result;
dashHelper(path, result);
return result;
}
V_END_NAMESPACE
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