mirror of https://github.com/NekoX-Dev/NekoX.git
216 lines
5.8 KiB
C++
Executable File
216 lines
5.8 KiB
C++
Executable File
/*
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* Copyright (c) 2018 Samsung Electronics Co., Ltd. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "vbezier.h"
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#include <cmath>
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#include "vdasher.h"
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#include "vline.h"
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V_BEGIN_NAMESPACE
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VDasher::VDasher(const float *dashArray, size_t size)
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{
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mDashArray = reinterpret_cast<const VDasher::Dash *>(dashArray);
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mArraySize = size / 2;
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if (size % 2) mDashOffset = dashArray[size - 1];
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mIndex = 0;
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mCurrentLength = 0;
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mDiscard = false;
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}
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void VDasher::moveTo(const VPointF &p)
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{
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mDiscard = false;
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mStartNewSegment = true;
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mCurPt = p;
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mIndex = 0;
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if (!vCompare(mDashOffset, 0.0f)) {
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float totalLength = 0.0;
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for (size_t i = 0; i < mArraySize; i++) {
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totalLength = mDashArray[i].length + mDashArray[i].gap;
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}
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float normalizeLen = std::fmod(mDashOffset, totalLength);
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if (normalizeLen < 0.0f) {
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normalizeLen = totalLength + normalizeLen;
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}
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// now the length is less than total length and +ve
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// findout the current dash index , dashlength and gap.
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for (size_t i = 0; i < mArraySize; i++) {
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if (normalizeLen < mDashArray[i].length) {
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mIndex = i;
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mCurrentLength = mDashArray[i].length - normalizeLen;
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mDiscard = false;
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break;
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}
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normalizeLen -= mDashArray[i].length;
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if (normalizeLen < mDashArray[i].gap) {
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mIndex = i;
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mCurrentLength = mDashArray[i].gap - normalizeLen;
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mDiscard = true;
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break;
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}
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normalizeLen -= mDashArray[i].gap;
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}
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} else {
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mCurrentLength = mDashArray[mIndex].length;
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}
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if (vIsZero(mCurrentLength)) updateActiveSegment();
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}
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void VDasher::addLine(const VPointF &p)
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{
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if (mDiscard) return;
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if (mStartNewSegment) {
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mResult.moveTo(mCurPt);
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mStartNewSegment = false;
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}
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mResult.lineTo(p);
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}
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void VDasher::updateActiveSegment()
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{
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mStartNewSegment = true;
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if (mDiscard) {
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mDiscard = false;
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mIndex = (mIndex + 1) % mArraySize;
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mCurrentLength = mDashArray[mIndex].length;
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} else {
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mDiscard = true;
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mCurrentLength = mDashArray[mIndex].gap;
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}
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if (vIsZero(mCurrentLength)) updateActiveSegment();
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}
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void VDasher::lineTo(const VPointF &p)
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{
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VLine left, right;
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VLine line(mCurPt, p);
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float length = line.length();
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if (length <= mCurrentLength) {
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mCurrentLength -= length;
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addLine(p);
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} else {
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while (length > mCurrentLength) {
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length -= mCurrentLength;
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line.splitAtLength(mCurrentLength, left, right);
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addLine(left.p2());
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updateActiveSegment();
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line = right;
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mCurPt = line.p1();
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}
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// handle remainder
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if (length > 1.0f) {
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mCurrentLength -= length;
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addLine(line.p2());
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}
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}
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if (mCurrentLength < 1.0f) updateActiveSegment();
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mCurPt = p;
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}
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void VDasher::addCubic(const VPointF &cp1, const VPointF &cp2, const VPointF &e)
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{
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if (mDiscard) return;
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if (mStartNewSegment) {
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mResult.moveTo(mCurPt);
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mStartNewSegment = false;
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}
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mResult.cubicTo(cp1, cp2, e);
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}
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void VDasher::cubicTo(const VPointF &cp1, const VPointF &cp2, const VPointF &e)
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{
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VBezier left, right;
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VBezier b = VBezier::fromPoints(mCurPt, cp1, cp2, e);
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float bezLen = b.length();
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if (bezLen <= mCurrentLength) {
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mCurrentLength -= bezLen;
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addCubic(cp1, cp2, e);
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} else {
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while (bezLen > mCurrentLength) {
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bezLen -= mCurrentLength;
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b.splitAtLength(mCurrentLength, &left, &right);
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addCubic(left.pt2(), left.pt3(), left.pt4());
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updateActiveSegment();
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b = right;
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mCurPt = b.pt1();
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}
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// handle remainder
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if (bezLen > 1.0f) {
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mCurrentLength -= bezLen;
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addCubic(b.pt2(), b.pt3(), b.pt4());
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}
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}
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if (mCurrentLength < 1.0f) updateActiveSegment();
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mCurPt = e;
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}
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VPath VDasher::dashed(const VPath &path)
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{
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if (path.empty()) return VPath();
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mResult = {};
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mResult.reserve(path.points().size(), path.elements().size());
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mIndex = 0;
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const std::vector<VPath::Element> &elms = path.elements();
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const std::vector<VPointF> & pts = path.points();
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const VPointF * ptPtr = pts.data();
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for (auto &i : elms) {
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switch (i) {
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case VPath::Element::MoveTo: {
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moveTo(*ptPtr++);
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break;
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}
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case VPath::Element::LineTo: {
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lineTo(*ptPtr++);
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break;
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}
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case VPath::Element::CubicTo: {
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cubicTo(*ptPtr, *(ptPtr + 1), *(ptPtr + 2));
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ptPtr += 3;
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break;
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}
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case VPath::Element::Close: {
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// The point is already joined to start point in VPath
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// no need to do anything here.
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break;
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}
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}
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}
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return std::move(mResult);
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}
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V_END_NAMESPACE
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