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loader/lottie: fix a broken masking feature.

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the inverse alpha should keep its own value.
previously, it's modified to alpha by a mistake.
This commit is contained in:
Hermet Park 2023-08-31 11:48:13 +09:00 • committed by Hermet Park
parent 7c669f622f
commit 22771b5d8a
1 changed files with 7 additions and 2 deletions
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9
src/loaders/lottie/tvgLottieBuilder.cpp
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@ -588,8 +588,9 @@ static void _updateMaskings(LottieLayer* layer, int32_t frameNo)
if (mask->pathset(frameNo, P(shape)->rs.path.cmds, P(shape)->rs.path.pts)) {
P(shape)->update(RenderUpdateFlag::Path);
}
auto method = mask->method;
if (mergingMask) {
auto method = mask->method;
//false of false is true. invert.
if (method == CompositeMethod::SubtractMask && pmethod == method) {
method = CompositeMethod::AddMask;
} else if (pmethod == CompositeMethod::DifferenceMask && pmethod == method) {
@ -597,7 +598,11 @@ static void _updateMaskings(LottieLayer* layer, int32_t frameNo)
}
mergingMask->composite(cast<Shape>(shape), method);
} else {
layer->scene->composite(cast<Shape>(shape), CompositeMethod::AlphaMask);
if (method == CompositeMethod::SubtractMask) method = CompositeMethod::InvAlphaMask;
else if (method == CompositeMethod::AddMask) method = CompositeMethod::AlphaMask;
else if (method == CompositeMethod::IntersectMask) method = CompositeMethod::AlphaMask;
else if (method == CompositeMethod::DifferenceMask) method = CompositeMethod::AlphaMask; //does this correct?
layer->scene->composite(cast<Shape>(shape), method);
}
pmethod = mask->method;
mergingMask = shape;