Bug 1396489 - Part 1. Change gfxContext::GetClipExtents to a const function. r=mstange

MozReview-Commit-ID: ANFDAxeL5G0

--HG--
extra : rebase_source : 1ce7dec9ce121522caec3f316b71092634d5cdb0

gfx/thebes/gfxContext.cpp

@@ -595,7 +595,7 @@ gfxContext::PopClip()
 }
 
 gfxRect
-gfxContext::GetClipExtents()
+gfxContext::GetClipExtents() const
 {
   Rect rect = GetAzureDeviceSpaceClipBounds();
 
@@ -1062,13 +1062,13 @@ gfxContext::ChangeTransform(const Matrix &aNewMatrix, bool aUpdatePatternTransfo
 }
 
 Rect
-gfxContext::GetAzureDeviceSpaceClipBounds()
+gfxContext::GetAzureDeviceSpaceClipBounds() const
 {
   Rect rect(CurrentState().deviceOffset.x, CurrentState().deviceOffset.y,
             Float(mDT->GetSize().width), Float(mDT->GetSize().height));
   for (unsigned int i = 0; i < mStateStack.Length(); i++) {
     for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
-      AzureState::PushedClip &clip = mStateStack[i].pushedClips[c];
+      const AzureState::PushedClip &clip = mStateStack[i].pushedClips[c];
       if (clip.path) {
         Rect bounds = clip.path->GetBounds(clip.transform);
         rect.IntersectRect(rect, bounds);

gfx/thebes/gfxContext.h

@@ -381,7 +381,7 @@ public:
      * This will return the current bounds of the clip region in user
      * space.
      */
-    gfxRect GetClipExtents();
+    gfxRect GetClipExtents() const;
 
     /**
      * Returns true if the given rectangle is fully contained in the current clip.
@@ -519,7 +519,7 @@ private:
   void FillAzure(const Pattern& aPattern, mozilla::gfx::Float aOpacity);
   CompositionOp GetOp();
   void ChangeTransform(const mozilla::gfx::Matrix &aNewMatrix, bool aUpdatePatternTransform = true);
-  Rect GetAzureDeviceSpaceClipBounds();
+  Rect GetAzureDeviceSpaceClipBounds() const;
   Matrix GetDeviceTransform() const;
   Matrix GetDTTransform() const;