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Bug 716439; mask layer - member, getter, setter, dumping. r=roc

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This commit is contained in:
Nicholas Cameron 2012-01-18 14:35:49 +13:00
parent 1b6756aa23
commit 34d6ba072b
2 changed files with 38 additions and 0 deletions
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6
gfx/layers/Layers.cpp
View File

@ -603,6 +603,12 @@ Layer::Dump(FILE* aFile, const char* aPrefix)
DumpSelf(aFile, aPrefix);
fprintf(aFile, "</a>");
if (Layer* mask = GetMaskLayer()) {
nsCAutoString pfx(aPrefix);
pfx += " Mask layer: ";
mask->Dump(aFile, pfx.get());
}
if (Layer* kid = GetFirstChild()) {
nsCAutoString pfx(aPrefix);
pfx += " ";

32
gfx/layers/Layers.h
View File

@ -695,6 +695,35 @@ public:
Mutated();
}
/**
* CONSTRUCTION PHASE ONLY
* Set a layer to mask this layer.
*
* The mask layer should be applied using its effective transform (after it
* is calculated by ComputeEffectiveTransformForMaskLayer), this should use
* this layer's parent's transform and the mask layer's transform, but not
* this layer's. That is, the mask layer is specified relative to this layer's
* position in it's parent layer's coord space.
* Currently, only 2D translations are supported for the mask layer transform.
*
* Ownership of aMaskLayer passes to this.
* Typical use would be an ImageLayer with an alpha image used for masking.
* See also ContainerState::BuildMaskLayer in FrameLayerBuilder.cpp.
*/
void SetMaskLayer(Layer* aMaskLayer)
{
#ifdef DEBUG
if (aMaskLayer) {
gfxMatrix maskTransform;
bool maskIs2D = aMaskLayer->GetTransform().CanDraw2D(&maskTransform);
NS_ASSERTION(maskIs2D && maskTransform.HasOnlyIntegerTranslation(),
"Mask layer has invalid transform.");
}
#endif
mMaskLayer = aMaskLayer;
}
/**
* CONSTRUCTION PHASE ONLY
* Tell this layer what its transform should be. The transformation
@ -722,6 +751,7 @@ public:
virtual Layer* GetLastChild() { return nsnull; }
const gfx3DMatrix& GetTransform() { return mTransform; }
bool GetIsFixedPosition() { return mIsFixedPosition; }
Layer* GetMaskLayer() { return mMaskLayer; }
/**
* DRAWING PHASE ONLY
@ -903,6 +933,7 @@ protected:
mNextSibling(nsnull),
mPrevSibling(nsnull),
mImplData(aImplData),
mMaskLayer(nsnull),
mOpacity(1.0),
mContentFlags(0),
mUseClipRect(false),
@ -946,6 +977,7 @@ protected:
Layer* mNextSibling;
Layer* mPrevSibling;
void* mImplData;
nsRefPtr<Layer> mMaskLayer;
LayerUserDataSet mUserData;
nsIntRegion mVisibleRegion;
gfx3DMatrix mTransform;