Bug 351798 - path mouseover fires outside svg. r+sr=roc

layout/svg/base/src/nsSVGImageFrame.cpp

@@ -91,6 +91,7 @@ public:
 
   // nsISVGChildFrame interface:
   NS_IMETHOD PaintSVG(nsISVGRendererCanvas* canvas, nsRect *aDirtyRect);
+  NS_IMETHOD GetFrameForPointSVG(float x, float y, nsIFrame** hit);
 
   // nsSVGGeometryFrame overload:
   // Lie about our fill/stroke so hit detection works
@@ -120,6 +121,8 @@ public:
 #endif
 
 private:
+  already_AddRefed<nsIDOMSVGMatrix> GetImageTransform();
+
   nsCOMPtr<nsIDOMSVGPreserveAspectRatio> mPreserveAspectRatio;
 
   nsCOMPtr<imgIDecoderObserver> mListener;
@@ -215,6 +218,37 @@ nsSVGImageFrame::AttributeChanged(PRInt32         aNameSpaceID,
                                                    aAttribute, aModType);
 }
 
+already_AddRefed<nsIDOMSVGMatrix>
+nsSVGImageFrame::GetImageTransform()
+{
+  nsCOMPtr<nsIDOMSVGMatrix> ctm;
+  GetCanvasTM(getter_AddRefs(ctm));
+
+  float x, y, width, height;
+  nsSVGElement *element = NS_STATIC_CAST(nsSVGElement*, mContent);
+  element->GetAnimatedLengthValues(&x, &y, &width, &height, nsnull);
+
+  PRUint32 nativeWidth, nativeHeight;
+  nativeWidth = cairo_image_surface_get_width(mSurface);
+  nativeHeight = cairo_image_surface_get_height(mSurface);
+
+  nsCOMPtr<nsIDOMSVGImageElement> image = do_QueryInterface(mContent);
+  nsCOMPtr<nsIDOMSVGAnimatedPreserveAspectRatio> ratio;
+  image->GetPreserveAspectRatio(getter_AddRefs(ratio));
+
+  nsCOMPtr<nsIDOMSVGMatrix> trans, ctmXY, fini;
+  trans = nsSVGUtils::GetViewBoxTransform(width, height,
+                                          0, 0,
+                                          nativeWidth, nativeHeight,
+                                          ratio);
+  ctm->Translate(x, y, getter_AddRefs(ctmXY));
+  ctmXY->Multiply(trans, getter_AddRefs(fini));
+
+  nsIDOMSVGMatrix *retval = nsnull;
+  fini.swap(retval);
+  return retval;
+}
+
 //----------------------------------------------------------------------
 // nsISVGChildFrame methods:
 NS_IMETHODIMP
@@ -254,21 +288,7 @@ nsSVGImageFrame::PaintSVG(nsISVGRendererCanvas* canvas, nsRect *aDirtyRect)
     nsSVGElement *element = NS_STATIC_CAST(nsSVGElement*, mContent);
     element->GetAnimatedLengthValues(&x, &y, &width, &height, nsnull);
 
-    PRUint32 nativeWidth, nativeHeight;
-    nativeWidth = cairo_image_surface_get_width(mSurface);
-    nativeHeight = cairo_image_surface_get_height(mSurface);
-
-    nsCOMPtr<nsIDOMSVGImageElement> image = do_QueryInterface(mContent);
-    nsCOMPtr<nsIDOMSVGAnimatedPreserveAspectRatio> ratio;
-    image->GetPreserveAspectRatio(getter_AddRefs(ratio));
-
-    nsCOMPtr<nsIDOMSVGMatrix> trans, ctmXY, fini;
-    trans = nsSVGUtils::GetViewBoxTransform(width, height,
-                                            0, 0,
-                                            nativeWidth, nativeHeight,
-                                            ratio);
-    ctm->Translate(x, y, getter_AddRefs(ctmXY));
-    ctmXY->Multiply(trans, getter_AddRefs(fini));
+    nsCOMPtr<nsIDOMSVGMatrix> fini = GetImageTransform();
 
     if (GetStyleDisplay()->IsScrollableOverflow()) {
       canvas->PushClip();
@@ -293,6 +313,27 @@ nsSVGImageFrame::PaintSVG(nsISVGRendererCanvas* canvas, nsRect *aDirtyRect)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsSVGImageFrame::GetFrameForPointSVG(float x, float y, nsIFrame** hit)
+{
+  if (GetStyleDisplay()->IsScrollableOverflow() && mSurface) {
+    PRUint32 nativeWidth, nativeHeight;
+    nativeWidth = cairo_image_surface_get_width(mSurface);
+    nativeHeight = cairo_image_surface_get_height(mSurface);
+
+    nsCOMPtr<nsIDOMSVGMatrix> fini = GetImageTransform();
+
+    if (!nsSVGUtils::HitTestRect(fini,
+                                 0, 0, nativeWidth, nativeHeight,
+                                 x, y)) {
+      *hit = nsnull;
+      return NS_OK;
+    }
+  }
+
+  return nsSVGPathGeometryFrame::GetFrameForPointSVG(x, y, hit);
+}
+
 nsIAtom *
 nsSVGImageFrame::GetType() const
 {

layout/svg/base/src/nsSVGInnerSVGFrame.cpp

@@ -92,7 +92,8 @@ public:
   NS_IMETHOD NotifyCanvasTMChanged(PRBool suppressInvalidation);
   NS_IMETHOD SetMatrixPropagation(PRBool aPropagate);
   NS_IMETHOD SetOverrideCTM(nsIDOMSVGMatrix *aCTM);
-  
+  NS_IMETHOD GetFrameForPointSVG(float x, float y, nsIFrame** hit);
+
   // nsSVGContainerFrame methods:
   virtual already_AddRefed<nsIDOMSVGMatrix> GetCanvasTM();
 
@@ -235,6 +236,31 @@ nsSVGInnerSVGFrame::SetOverrideCTM(nsIDOMSVGMatrix *aCTM)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsSVGInnerSVGFrame::GetFrameForPointSVG(float x, float y, nsIFrame** hit)
+{
+  if (GetStyleDisplay()->IsScrollableOverflow()) {
+    float clipX, clipY, clipWidth, clipHeight;
+    nsCOMPtr<nsIDOMSVGMatrix> clipTransform;
+
+    nsSVGElement *svg = NS_STATIC_CAST(nsSVGElement*, mContent);
+    svg->GetAnimatedLengthValues(&clipX, &clipY, &clipWidth, &clipHeight, nsnull);
+
+    nsSVGContainerFrame *parent = NS_STATIC_CAST(nsSVGContainerFrame*,
+                                                 mParent);
+    clipTransform = parent->GetCanvasTM();
+
+    if (!nsSVGUtils::HitTestRect(clipTransform,
+                                 clipX, clipY, clipWidth, clipHeight,
+                                 x, y)) {
+      *hit = nsnull;
+      return NS_OK;
+    }
+  }
+
+  return nsSVGInnerSVGFrameBase::GetFrameForPointSVG(x, y, hit);
+}
+
 //----------------------------------------------------------------------
 // nsISVGSVGFrame methods:
 

layout/svg/base/src/nsSVGUtils.cpp

@@ -965,3 +965,29 @@ nsSVGUtils::ConvertSVGMatrixToCairo(nsIDOMSVGMatrix *aMatrix)
   cairo_matrix_t m = { A, B, C, D, E, F };
   return m;
 }
+
+PRBool
+nsSVGUtils::HitTestRect(nsIDOMSVGMatrix *aMatrix,
+                        float aRX, float aRY, float aRWidth, float aRHeight,
+                        float aX, float aY)
+{
+  PRBool result = PR_TRUE;
+
+  if (aMatrix) {
+    cairo_matrix_t matrix = ConvertSVGMatrixToCairo(aMatrix);
+    cairo_t *ctx = cairo_create(GetCairoComputationalSurface());
+    cairo_set_tolerance(ctx, 1.0);
+
+    cairo_set_matrix(ctx, &matrix);
+    cairo_new_path(ctx);
+    cairo_rectangle(ctx, aRX, aRY, aRWidth, aRHeight);
+    cairo_identity_matrix(ctx);
+
+    if (!cairo_in_fill(ctx, aX, aY))
+      result = PR_FALSE;
+
+    cairo_destroy(ctx);
+  }
+
+  return result;
+}

layout/svg/base/src/nsSVGUtils.h

@@ -260,6 +260,14 @@ public:
   static cairo_matrix_t
   ConvertSVGMatrixToCairo(nsIDOMSVGMatrix *aMatrix);
 
+  /*
+   * Hit test a given rectangle/matrix.
+   */
+  static PRBool
+  HitTestRect(nsIDOMSVGMatrix *aMatrix,
+              float aRX, float aRY, float aRWidth, float aRHeight,
+              float aX, float aY);
+
 private:
   /* Cairo computational (nil) surface */
   static cairo_surface_t *mCairoComputationalSurface;