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lottie/render: Use AlignCenter rule when the composition dosen't scale exactly to the requested size.

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Change-Id: Ibd8aa929186104378287b65785afbc799cad0e04
This commit is contained in:
subhransu mohanty 2018-07-27 14:42:02 +09:00
parent 792cd0d5f5
commit e62f74b624
1 changed files with 15 additions and 6 deletions
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21
src/lottie/lottieitem.cpp
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@ -92,16 +92,25 @@ VSize LOTCompItem::size() const
bool LOTCompItem::update(int frameNo)
{
VMatrix m;
float sx, sy;
// check if cached frame is same as requested frame.
if (!mUpdateViewBox && (mCurFrameNo == frameNo)) return false;
sx = mViewSize.width() / float(mCompData->size().width());
sy = mViewSize.height() / float(mCompData->size().height());
/*
* if viewbox dosen't scale exactly to the viewport
* we scale the viewbox keeping AspectRatioPreserved and then align the
* viewbox to the viewport using AlignCenter rule.
*/
VSize viewPort = mViewSize;
VSize viewBox = mCompData->size();
float sx = float(viewPort.width()) / viewBox.width();
float sy = float(viewPort.height()) / viewBox.height();
float scale = fmin(sx, sy);
m.scale(scale, scale);
float tx = (viewPort.width() - viewBox.width() * scale) * 0.5;
float ty = (viewPort.height() - viewBox.height() * scale) * 0.5;
VMatrix m;
m.scale(scale, scale).translate(tx, ty);
// update the layer from back to front
for (auto i = mLayers.rbegin(); i != mLayers.rend(); ++i) {