Bug 627273, part 2: Add some gfx path helpers. sr=roc

gfx/thebes/gfxUtils.cpp

@@ -434,9 +434,10 @@ gfxUtils::ImageFormatToDepth(gfxASurface::gfxImageFormat aFormat)
     }
     return 0;
 }
+
 static void
-ClipToRegionInternal(gfxContext* aContext, const nsIntRegion& aRegion,
-                     PRBool aSnap)
+PathFromRegionInternal(gfxContext* aContext, const nsIntRegion& aRegion,
+                       PRBool aSnap)
 {
   aContext->NewPath();
   nsIntRegionRectIterator iter(aRegion);
@@ -444,6 +445,13 @@ ClipToRegionInternal(gfxContext* aContext, const nsIntRegion& aRegion,
   while ((r = iter.Next()) != nsnull) {
     aContext->Rectangle(gfxRect(r->x, r->y, r->width, r->height), aSnap);
   }
+}
+
+static void
+ClipToRegionInternal(gfxContext* aContext, const nsIntRegion& aRegion,
+                     PRBool aSnap)
+{
+  PathFromRegionInternal(aContext, aRegion, aSnap);
   aContext->Clip();
 }
 
@@ -459,6 +467,19 @@ gfxUtils::ClipToRegionSnapped(gfxContext* aContext, const nsIntRegion& aRegion)
   ClipToRegionInternal(aContext, aRegion, PR_TRUE);
 }
 
+/*static*/ void
+gfxUtils::PathFromRegion(gfxContext* aContext, const nsIntRegion& aRegion)
+{
+  PathFromRegionInternal(aContext, aRegion, PR_FALSE);
+}
+
+/*static*/ void
+gfxUtils::PathFromRegionSnapped(gfxContext* aContext, const nsIntRegion& aRegion)
+{
+  PathFromRegionInternal(aContext, aRegion, PR_TRUE);
+}
+
+
 PRBool
 gfxUtils::GfxRectToIntRect(const gfxRect& aIn, nsIntRect* aOut)
 {

gfx/thebes/gfxUtils.h

@@ -96,6 +96,16 @@ public:
      */
     static void ClipToRegionSnapped(gfxContext* aContext, const nsIntRegion& aRegion);
 
+    /**
+     * Create a path consisting of rectangles in |aRegion|.
+     */
+    static void PathFromRegion(gfxContext* aContext, const nsIntRegion& aRegion);
+
+    /**
+     * Create a path consisting of rectangles in |aRegion|, snapping the rectangles.
+     */
+    static void PathFromRegionSnapped(gfxContext* aContext, const nsIntRegion& aRegion);
+
     /*
      * Convert image format to depth value
      */