1 files changed, 58 insertions, 0 deletions
diff --git a/layout/svg/DisplaySVGItem.cpp b/layout/svg/DisplaySVGItem.cpp
new file mode 100644
index 0000000000..dfc77c6747
--- /dev/null
+++ b/layout/svg/DisplaySVGItem.cpp
@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Main header first:
+#include "DisplaySVGItem.h"
+
+#include "mozilla/ISVGDisplayableFrame.h"
+#include "mozilla/SVGUtils.h"
+#include "nsLayoutUtils.h"
+#include "nsPoint.h"
+
+using namespace mozilla::gfx;
+using namespace mozilla::image;
+
+namespace mozilla {
+
+void DisplaySVGItem::HitTest(nsDisplayListBuilder* aBuilder,
+                             const nsRect& aRect, HitTestState* aState,
+                             nsTArray<nsIFrame*>* aOutFrames) {
+  ISVGDisplayableFrame* svgFrame = do_QueryFrame(mFrame);
+  MOZ_ASSERT(svgFrame, "Unexpected frame type");
+
+  nsPoint pointRelativeToReferenceFrame = aRect.Center();
+  // ToReferenceFrame() includes mFrame->GetPosition(), our user
+  // space position.
+  nsPoint userSpacePtInAppUnits = pointRelativeToReferenceFrame -
+                                  (ToReferenceFrame() - mFrame->GetPosition());
+  gfxPoint userSpacePt =
+      gfxPoint(userSpacePtInAppUnits.x, userSpacePtInAppUnits.y) /
+      AppUnitsPerCSSPixel();
+  if (auto* target = svgFrame->GetFrameForPoint(userSpacePt)) {
+    aOutFrames->AppendElement(target);
+  }
+}
+
+void DisplaySVGItem::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
+  ISVGDisplayableFrame* svgFrame = do_QueryFrame(mFrame);
+  MOZ_ASSERT(svgFrame, "Unexpected frame type");
+  int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
+
+  // ToReferenceFrame() includes our mRect offset, but painting takes
+  // account of that too. To avoid double counting, we subtract that
+  // here.
+  nsPoint offset = ToReferenceFrame() - mFrame->GetPosition();
+
+  gfxPoint devPixelOffset =
+      nsLayoutUtils::PointToGfxPoint(offset, appUnitsPerDevPixel);
+
+  gfxMatrix tm = SVGUtils::GetCSSPxToDevPxMatrix(mFrame) *
+                 gfxMatrix::Translation(devPixelOffset);
+  imgDrawingParams imgParams(aBuilder->GetImageDecodeFlags());
+  svgFrame->PaintSVG(*aCtx, tm, imgParams);
+}
+
+}  // namespace mozilla