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Bug 1055585 - Add nsDisplayClearBackground. r=roc

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This commit is contained in:
Markus Stange 2014-08-20 17:16:41 +02:00
parent c1e7e1d0f7
commit 000d7be674
3 changed files with 63 additions and 0 deletions
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1
layout/base/nsDisplayItemTypesList.h
View File

@ -19,6 +19,7 @@ DECLARE_DISPLAY_ITEM_TYPE(CANVAS_FOCUS)
DECLARE_DISPLAY_ITEM_TYPE(CARET)
DECLARE_DISPLAY_ITEM_TYPE(CHECKED_CHECKBOX)
DECLARE_DISPLAY_ITEM_TYPE(CHECKED_RADIOBUTTON)
DECLARE_DISPLAY_ITEM_TYPE(CLEAR_BACKGROUND)
DECLARE_DISPLAY_ITEM_TYPE(COLUMN_RULE)
DECLARE_DISPLAY_ITEM_TYPE(COMBOBOX_FOCUS)
DECLARE_DISPLAY_ITEM_TYPE(EVENT_RECEIVER)

23
layout/base/nsDisplayList.cpp
View File

@ -2651,6 +2651,29 @@ nsDisplayBackgroundColor::WriteDebugInfo(nsACString& aTo)
}
#endif
already_AddRefed<Layer>
nsDisplayClearBackground::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
nsRefPtr<ColorLayer> layer = static_cast<ColorLayer*>
(aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, this));
if (!layer) {
layer = aManager->CreateColorLayer();
if (!layer)
return nullptr;
}
layer->SetColor(NS_RGBA(0, 0, 0, 0));
layer->SetMixBlendMode(gfx::CompositionOp::OP_SOURCE);
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
layer->SetBounds(bounds.ToNearestPixels(appUnitsPerDevPixel)); // XXX Do we need to respect the parent layer's scale here?
return layer.forget();
}
nsRect
nsDisplayOutline::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) {
*aSnap = false;

39
layout/base/nsDisplayList.h
View File

@ -2297,6 +2297,45 @@ protected:
gfxRGBA mColor;
};
class nsDisplayClearBackground : public nsDisplayItem
{
public:
nsDisplayClearBackground(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame)
{ }
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) MOZ_OVERRIDE
{
*aSnap = true;
return nsRect(ToReferenceFrame(), Frame()->GetSize());
}
virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) MOZ_OVERRIDE {
*aSnap = false;
return GetBounds(aBuilder, aSnap);
}
virtual bool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) MOZ_OVERRIDE
{
*aColor = NS_RGBA(0, 0, 0, 0);
return true;
}
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters) MOZ_OVERRIDE
{
return mozilla::LAYER_ACTIVE_FORCE;
}
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters) MOZ_OVERRIDE;
NS_DISPLAY_DECL_NAME("ClearBackground", TYPE_CLEAR_BACKGROUND)
};
/**
* The standard display item to paint the outer CSS box-shadows of a frame.
*/