LottieAnimation: fix effect of changing output quality

Enable expensive Antialiasig for High quality only;
enable much cheaper Smooth Sampling (linear texture filtering)
for both Medium and High quality.

Setting these properties on QQuickPaintedItem implies
respective properties of the QPainter and the texture provider.

Change-Id: Ice664935686d9b663d4892fea9389f21d870f9ee
Reviewed-by: Rebecca Worledge <rebecca.worledge@theqtcompany.com>

1 files changed, 5 insertions, 8 deletions

diff --git a/src/imports/lottieanimation.cpp b/src/imports/lottieanimation.cpp
index 87d739d..5477bdf 100644
--- a/src/imports/lottieanimation.cpp
+++ b/src/imports/lottieanimation.cpp
@@ -222,13 +222,6 @@ void LottieAnimation::componentComplete()
 
 void LottieAnimation::paint(QPainter *painter)
 {
-    // TODO: Check does this have effect on output quality (or performance)
-    if (m_quality != LowQuality)
-        painter->setRenderHints(QPainter::Antialiasing);
-    if (m_quality == HighQuality)
-        painter->setRenderHints(QPainter::SmoothPixmapTransform);
-
-    LottieRasterRenderer renderer(painter);
     BMBase* bmTree = m_frameRenderThread->getFrame(this, m_currentFrame);
 
     if (!bmTree) {
@@ -237,6 +230,8 @@ void LottieAnimation::paint(QPainter *painter)
         return;
     }
 
+    LottieRasterRenderer renderer(painter);
+
     qCDebug(lcLottieQtBodymovinRender) << static_cast<void*>(this) << "Start to paint frame"  << m_currentFrame;
 
     for (BMBase *elem : bmTree->children()) {
@@ -357,7 +352,7 @@ void LottieAnimation::setFrameRate(int frameRate)
            used
 
     \value LottieAnimation.MediumQuality
-           Antialiasing is used but no smooth pixmap transformation algorithm
+           Smooth pixmap transformation algorithm is used but no antialiasing
            (Default)
 
     \value LottieAnimation.HighQuality
@@ -377,6 +372,8 @@ void LottieAnimation::setQuality(LottieAnimation::Quality quality)
             setRenderTarget(QQuickPaintedItem::FramebufferObject);
         else
             setRenderTarget(QQuickPaintedItem::Image);
+        setSmooth(quality != LowQuality);
+        setAntialiasing(quality == HighQuality);
         emit qualityChanged();
     }
 }