blob: 442b6d41f28f4075247efcf7540c89a876f9010f [file] [log] [blame]
//========================================================================
//
// SplashPath.cc
//
//========================================================================
//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2018 Stefan BrĂ¼ns <stefan.bruens@rwth-aachen.de>
// Copyright (C) 2018-2021 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2018 Adam Reichold <adam.reichold@t-online.de>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================
#include <config.h>
#include <cstring>
#include "goo/gmem.h"
#include "goo/GooLikely.h"
#include "SplashErrorCodes.h"
#include "SplashPath.h"
//------------------------------------------------------------------------
// SplashPath
//------------------------------------------------------------------------
// A path can be in three possible states:
//
// 1. no current point -- zero or more finished subpaths
// [curSubpath == length]
//
// 2. one point in subpath
// [curSubpath == length - 1]
//
// 3. open subpath with two or more points
// [curSubpath < length - 1]
SplashPath::SplashPath()
{
pts = nullptr;
flags = nullptr;
length = size = 0;
curSubpath = 0;
hints = nullptr;
hintsLength = hintsSize = 0;
}
SplashPath::SplashPath(SplashPath &&path) noexcept
{
length = path.length;
size = path.size;
pts = path.pts;
flags = path.flags;
curSubpath = path.curSubpath;
hints = path.hints;
hintsLength = hintsSize = path.hintsLength;
path.pts = nullptr;
path.flags = nullptr;
path.length = path.size = 0;
path.hints = nullptr;
path.hintsLength = path.hintsSize = 0;
}
SplashPath::~SplashPath()
{
gfree(pts);
gfree(flags);
gfree(hints);
}
void SplashPath::reserve(int nPts)
{
grow(nPts - size);
}
// Add space for <nPts> more points.
void SplashPath::grow(int nPts)
{
if (length + nPts > size) {
if (size == 0) {
size = 32;
}
while (size < length + nPts) {
size *= 2;
}
pts = (SplashPathPoint *)greallocn_checkoverflow(pts, size, sizeof(SplashPathPoint));
flags = (unsigned char *)greallocn_checkoverflow(flags, size, sizeof(unsigned char));
if (unlikely(!pts || !flags)) {
length = size = curSubpath = 0;
}
}
}
void SplashPath::append(SplashPath *path)
{
int i;
grow(path->length);
if (unlikely(size == 0)) {
return;
}
curSubpath = length + path->curSubpath;
for (i = 0; i < path->length; ++i) {
pts[length] = path->pts[i];
flags[length] = path->flags[i];
++length;
}
}
SplashError SplashPath::moveTo(SplashCoord x, SplashCoord y)
{
if (onePointSubpath()) {
return splashErrBogusPath;
}
grow(1);
if (unlikely(size == 0)) {
return splashErrBogusPath;
}
pts[length].x = x;
pts[length].y = y;
flags[length] = splashPathFirst | splashPathLast;
curSubpath = length++;
return splashOk;
}
SplashError SplashPath::lineTo(SplashCoord x, SplashCoord y)
{
if (noCurrentPoint()) {
return splashErrNoCurPt;
}
flags[length - 1] &= ~splashPathLast;
grow(1);
if (unlikely(size == 0)) {
return splashErrBogusPath;
}
pts[length].x = x;
pts[length].y = y;
flags[length] = splashPathLast;
++length;
return splashOk;
}
SplashError SplashPath::curveTo(SplashCoord x1, SplashCoord y1, SplashCoord x2, SplashCoord y2, SplashCoord x3, SplashCoord y3)
{
if (noCurrentPoint()) {
return splashErrNoCurPt;
}
flags[length - 1] &= ~splashPathLast;
grow(3);
if (unlikely(size == 0)) {
return splashErrBogusPath;
}
pts[length].x = x1;
pts[length].y = y1;
flags[length] = splashPathCurve;
++length;
pts[length].x = x2;
pts[length].y = y2;
flags[length] = splashPathCurve;
++length;
pts[length].x = x3;
pts[length].y = y3;
flags[length] = splashPathLast;
++length;
return splashOk;
}
SplashError SplashPath::close(bool force)
{
if (noCurrentPoint()) {
return splashErrNoCurPt;
}
if (force || curSubpath == length - 1 || pts[length - 1].x != pts[curSubpath].x || pts[length - 1].y != pts[curSubpath].y) {
const auto lineToStatus = lineTo(pts[curSubpath].x, pts[curSubpath].y);
if (lineToStatus != splashOk) {
return lineToStatus;
}
}
flags[curSubpath] |= splashPathClosed;
flags[length - 1] |= splashPathClosed;
curSubpath = length;
return splashOk;
}
void SplashPath::addStrokeAdjustHint(int ctrl0, int ctrl1, int firstPt, int lastPt)
{
if (hintsLength == hintsSize) {
hintsSize = hintsLength ? 2 * hintsLength : 8;
hints = (SplashPathHint *)greallocn_checkoverflow(hints, hintsSize, sizeof(SplashPathHint));
}
if (unlikely(!hints)) {
return;
}
hints[hintsLength].ctrl0 = ctrl0;
hints[hintsLength].ctrl1 = ctrl1;
hints[hintsLength].firstPt = firstPt;
hints[hintsLength].lastPt = lastPt;
++hintsLength;
}
void SplashPath::offset(SplashCoord dx, SplashCoord dy)
{
int i;
for (i = 0; i < length; ++i) {
pts[i].x += dx;
pts[i].y += dy;
}
}
bool SplashPath::getCurPt(SplashCoord *x, SplashCoord *y)
{
if (noCurrentPoint()) {
return false;
}
*x = pts[length - 1].x;
*y = pts[length - 1].y;
return true;
}