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Bug 1189611 - Improve the APZ minimap position and ignore trivial APZ. r=kats

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This commit is contained in:
Benoit Girard 2015-07-31 13:24:24 -04:00
parent bffb4b1a19
commit 41feae4820
1 changed files with 8 additions and 2 deletions
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10
gfx/layers/composite/ContainerLayerComposite.cpp
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@ -446,10 +446,16 @@ RenderMinimap(ContainerT* aContainer, LayerManagerComposite* aManager,
// Rects
const FrameMetrics& fm = aLayer->GetFrameMetrics(0);
ParentLayerRect compositionBounds = fm.GetCompositionBounds();
LayerRect scrollRect = fm.GetScrollableRect() * fm.LayersPixelsPerCSSPixel();
LayerRect viewRect = ParentLayerRect(scrollOffset, fm.GetCompositionBounds().Size()) / LayerToParentLayerScale(1);
LayerRect viewRect = ParentLayerRect(scrollOffset, compositionBounds.Size()) / LayerToParentLayerScale(1);
LayerRect dp = (fm.GetDisplayPort() + fm.GetScrollOffset()) * fm.LayersPixelsPerCSSPixel();
// Don't render trivial minimap. They can show up from textboxes and other tiny frames.
if (viewRect.width < 64 && viewRect.height < 64) {
return;
}
// Compute a scale with an appropriate aspect ratio
// We allocate up to 100px of width and the height of this layer.
float scaleFactor;
@ -460,7 +466,7 @@ RenderMinimap(ContainerT* aContainer, LayerManagerComposite* aManager,
scaleFactor = std::min(scaleFactorX, scaleFactorY);
Matrix4x4 transform = Matrix4x4::Scaling(scaleFactor, scaleFactor, 1);
transform.PostTranslate(horizontalPadding, verticalPadding, 0);
transform.PostTranslate(horizontalPadding + compositionBounds.x, verticalPadding + compositionBounds.y, 0);
Rect clipRect = aContainer->GetEffectiveTransform().TransformBounds(
transform.TransformBounds(scrollRect.ToUnknownRect()));