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Check for zero offsets for PolyUtils

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Bug: oss-fuzz:13202
Change-Id: Iee0ec8bdfe6345c91a584607cc499d69d227a919
Reviewed-on: https://skia-review.googlesource.com/c/194422
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
This commit is contained in:
Jim Van Verth 2019-02-22 15:17:36 -05:00 committed by Skia Commit-Bot
parent b8960d0535
commit 2a330e689b
1 changed files with 21 additions and 0 deletions
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21
src/utils/SkPolyUtils.cpp
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@ -318,6 +318,19 @@ bool SkInsetConvexPolygon(const SkPoint* inputPolygonVerts, int inputPolygonSize
return false;
}
// can't inset by a negative or non-finite amount
if (inset < -SK_ScalarNearlyZero || !SkScalarIsFinite(inset)) {
return false;
}
// insetting close to zero just returns the original poly
if (inset <= SK_ScalarNearlyZero) {
for (int i = 0; i < inputPolygonSize; ++i) {
*insetPolygon->push() = inputPolygonVerts[i];
}
return true;
}
// get winding direction
int winding = SkGetPolygonWinding(inputPolygonVerts, inputPolygonSize);
if (0 == winding) {
@ -1147,6 +1160,14 @@ bool SkOffsetSimplePolygon(const SkPoint* inputPolygonVerts, int inputPolygonSiz
return false;
}
// offsetting close to zero just returns the original poly
if (SkScalarNearlyZero(offset)) {
for (int i = 0; i < inputPolygonSize; ++i) {
*offsetPolygon->push() = inputPolygonVerts[i];
}
return true;
}
// get winding direction
int winding = SkGetPolygonWinding(inputPolygonVerts, inputPolygonSize);
if (0 == winding) {