Bug 958160 - Compute bounds in transformed space instead of user space in GetCoveredRegion. r=longsonr

--HG--
extra : rebase_source : 021b5fe58b234b83eb792d832296c79fe0160c48

dom/svg/test/bounds-helper.svg

@@ -59,5 +59,17 @@ text { font: 20px monospace; }
         transform="rotate(45 280 15) scale(2 3)"
         stroke-width="10" stroke-linecap="butt" stroke="indigo"
         vector-effect="non-scaling-stroke" />
+
+  <marker id="marker1" markerWidth="100" markerHeight="100"
+          refX="0" refY="50" markerUnits="userSpaceOnUse">
+    <line x1="0" y1="50" x2="50" y2="100" stroke="aqua" stroke-width="20"
+          transform="rotate(-45 0 50)" />
+  </marker>
+  <line id="shapeWithMarker1" x1="160" y1="130" x2="170" y2="130"
+        stroke="black" stroke-width="3" marker-end="url(#marker1)"/>
+
+  <line id="rotatedLine1" x1="160" y1="150" x2="180" y2="170"
+        stroke="darkmagenta" stroke-width="10"
+        transform="rotate(-45 160 150)" />
 </g>
 </svg>

dom/svg/test/test_bounds.html

@@ -261,6 +261,28 @@ function runTest()
   isWithAbsTolerance(nonScalingStrokedLine3Bounds.height, rect.height, 0.1,
                      "nonScalingStrokedLine3.getBoundingClientRect().height");
 
+  var shapeWithMarker1Bounds =
+    doc.getElementById("shapeWithMarker1").getBoundingClientRect();
+  isWithAbsTolerance(shapeWithMarker1Bounds.left, 160, 0.1,
+    "shapeWithMarker1Bounds.left");
+  isWithAbsTolerance(shapeWithMarker1Bounds.top, 120, 0.1,
+    "shapeWithMarker1Bounds.top");
+  isWithAbsTolerance(shapeWithMarker1Bounds.width, 10 + Math.SQRT2 * 50, 0.1,
+    "shapeWithMarker1Bounds.width");
+  isWithAbsTolerance(shapeWithMarker1Bounds.height, 20, 0.1,
+    "shapeWithMarker1Bounds.height");
+
+  var rotatedLine1Bounds =
+    doc.getElementById("rotatedLine1").getBoundingClientRect();
+  isWithAbsTolerance(rotatedLine1Bounds.left, 160, 0.1,
+    "rotatedLine1Bounds.left");
+  isWithAbsTolerance(rotatedLine1Bounds.top, 145, 0.1,
+    "rotatedLine1Bounds.top");
+  isWithAbsTolerance(rotatedLine1Bounds.width, Math.SQRT2 * 20, 0.1,
+    "rotatedLine1Bounds.width");
+  isWithAbsTolerance(rotatedLine1Bounds.height, 10, 0.1,
+    "rotatedLine1Bounds.height");
+
   SimpleTest.finish();
 }
 

layout/svg/nsSVGPathGeometryFrame.cpp

@@ -351,8 +351,23 @@ nsSVGPathGeometryFrame::GetFrameForPoint(const gfxPoint& aPoint)
 nsRect
 nsSVGPathGeometryFrame::GetCoveredRegion()
 {
+  gfxMatrix canvasTM = GetCanvasTM();
+  if (canvasTM.PreservesAxisAlignedRectangles()) {
+    return nsSVGUtils::TransformFrameRectToOuterSVG(
+             mRect, canvasTM, PresContext());
+  }
+
+  // To get tight bounds we need to compute directly in outer SVG coordinates
+  uint32_t flags = nsSVGUtils::eBBoxIncludeFill |
+                   nsSVGUtils::eBBoxIncludeStroke |
+                   nsSVGUtils::eBBoxIncludeMarkers;
+  gfxRect extent =
+    GetBBoxContribution(ToMatrix(canvasTM), flags).ToThebesRect();
+  nsRect region = nsLayoutUtils::RoundGfxRectToAppRect(
+                    extent, PresContext()->AppUnitsPerCSSPixel());
+
   return nsSVGUtils::TransformFrameRectToOuterSVG(
-           mRect, GetCanvasTM(), PresContext());
+                       region, gfxMatrix(), PresContext());
 }
 
 void