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check for valid inputs to shadows

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Bug: oss-fuzz:6766
Change-Id: I6b131d53564618bb2be50fa38a1c9fdf15deff05
Reviewed-on: https://skia-review.googlesource.com/112483
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Mike Reed <reed@google.com>
This commit is contained in:
Mike Reed 2018-03-06 10:31:27 -05:00 committed by Skia Commit-Bot
parent eb3f674d6d
commit 9d5c6743f6
1 changed files with 9 additions and 6 deletions
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15
src/utils/SkShadowTessellator.cpp
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@ -379,9 +379,7 @@ SkAmbientShadowTessellator::SkAmbientShadowTessellator(const SkPath& path,
, fSplitFirstEdge(false)
, fSplitPreviousEdge(false) {
// TODO: support some concave paths
if (!path.isConvex()) {
return;
}
SkASSERT(path.isConvex());
// Set base colors
SkScalar umbraAlpha = SkScalarInvert(SkDrawShadowMetrics::AmbientRecipAlpha(heightFunc(0, 0)));
@ -807,9 +805,7 @@ SkSpotShadowTessellator::SkSpotShadowTessellator(const SkPath& path, const SkMat
, fValidUmbra(true) {
// TODO: support some concave paths
if (!path.isConvex()) {
return;
}
SkASSERT(path.isConvex());
// make sure we're not below the canvas plane
if (this->setZOffset(path.getBounds(), ctm.hasPerspective())) {
@ -1414,6 +1410,9 @@ void SkSpotShadowTessellator::addEdge(const SkPoint& nextPoint, const SkVector&
sk_sp<SkVertices> SkShadowTessellator::MakeAmbient(const SkPath& path, const SkMatrix& ctm,
const SkPoint3& zPlane, bool transparent) {
if (!path.isFinite() || !path.isConvex() || !ctm.isFinite() || !zPlane.isFinite()) {
return nullptr;
}
SkAmbientShadowTessellator ambientTess(path, ctm, zPlane, transparent);
return ambientTess.releaseVertices();
}
@ -1421,6 +1420,10 @@ sk_sp<SkVertices> SkShadowTessellator::MakeAmbient(const SkPath& path, const SkM
sk_sp<SkVertices> SkShadowTessellator::MakeSpot(const SkPath& path, const SkMatrix& ctm,
const SkPoint3& zPlane, const SkPoint3& lightPos,
SkScalar lightRadius, bool transparent) {
if (!path.isFinite() || !path.isConvex() || !ctm.isFinite() || !zPlane.isFinite() ||
!lightPos.isFinite() || !SkScalarIsFinite(lightRadius) || !(lightRadius > 0)) {
return nullptr;
}
SkSpotShadowTessellator spotTess(path, ctm, zPlane, lightPos, lightRadius, transparent);
return spotTess.releaseVertices();
}