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loader/svg: Apply specification of out-of-range elliptical arc parameters

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The three specifications below apply.

Specification: https://www.w3.org/TR/SVG/paths.html#ArcOutOfRangeParameters

-
If the endpoint (x, y) of the segment is identical to the current point
(e.g., the endpoint of the previous segment),
then this is equivalent to omitting the elliptical arc segment entirely.

-
If either rx or ry is 0, then this arc is treated
as a straight line segment(a "lineto") joining the endpoints.

-
If either rx or ry have negative signs, these are dropped;
the absolute value is used instead.
This commit is contained in:
JunsuChoi 2024-01-26 12:26:06 +09:00 • committed by Sergii Liebodkin
parent 823b945666
commit 6015e2eb32
1 changed files with 12 additions and 3 deletions
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15
src/loaders/svg/tvgSvgPath.cpp
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@ -53,6 +53,7 @@
#include <cstring>
#include <math.h>
#include <ctype.h>
#include "tvgMath.h"
#include "tvgShape.h"
#include "tvgSvgLoaderCommon.h"
#include "tvgSvgPath.h"
@ -471,9 +472,17 @@ static bool _processCommand(Array<PathCommand>* cmds, Array<Point>* pts, char cm
}
case 'a':
case 'A': {
_pathAppendArcTo(cmds, pts, cur, curCtl, arr[5], arr[6], arr[0], arr[1], arr[2], arr[3], arr[4]);
*cur = *curCtl = {arr[5], arr[6]};
*isQuadratic = false;
if (arr[0] < FLT_EPSILON || arr[1] < FLT_EPSILON) {
Point p = {arr[5], arr[6]};
cmds->push(PathCommand::LineTo);
pts->push(p);
*cur = {arr[5], arr[6]};
}
else if (!mathEqual(cur->x, arr[5]) || !mathEqual(cur->y, arr[6])) {
_pathAppendArcTo(cmds, pts, cur, curCtl, arr[5], arr[6], fabsf(arr[0]), fabsf(arr[1]), arr[2], arr[3], arr[4]);
*cur = *curCtl = {arr[5], arr[6]};
*isQuadratic = false;
}
break;
}
default: {