diff -r 000000000000 -r 6474c204b198 layout/inspector/inFlasher.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/inspector/inFlasher.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,206 @@
+/* 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/. */
+
+#include "inFlasher.h"
+#include "inLayoutUtils.h"
+
+#include "nsIDOMElement.h"
+#include "nsIServiceManager.h"
+#include "nsIPresShell.h"
+#include "nsIFrame.h"
+#include "nsIWidget.h"
+#include "nsReadableUtils.h"
+#include "nsRenderingContext.h"
+#include "nsIDOMWindow.h"
+#include "nsIContent.h"
+
+#include "prprf.h"
+
+///////////////////////////////////////////////////////////////////////////////
+
+inFlasher::inFlasher() :
+  mColor(NS_RGB(0,0,0)),
+  mThickness(0),
+  mInvert(false)
+{
+}
+
+inFlasher::~inFlasher()
+{
+}
+
+NS_IMPL_ISUPPORTS(inFlasher, inIFlasher)
+
+///////////////////////////////////////////////////////////////////////////////
+// inIFlasher
+
+NS_IMETHODIMP
+inFlasher::GetColor(nsAString& aColor)
+{
+  // Copied from nsGenericHTMLElement::ColorToString()
+  char buf[10];
+  PR_snprintf(buf, sizeof(buf), "#%02x%02x%02x",
+              NS_GET_R(mColor), NS_GET_G(mColor), NS_GET_B(mColor));
+  CopyASCIItoUTF16(buf, aColor);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+inFlasher::SetColor(const nsAString& aColor)
+{
+  NS_ENSURE_FALSE(aColor.IsEmpty(), NS_ERROR_ILLEGAL_VALUE);
+
+  nsAutoString colorStr;
+  colorStr.Assign(aColor);
+
+  if (colorStr.CharAt(0) != '#') {
+    if (NS_ColorNameToRGB(colorStr, &mColor)) {
+      return NS_OK;
+    }
+  }
+  else {
+    colorStr.Cut(0, 1);
+    if (NS_HexToRGB(colorStr, &mColor)) {
+      return NS_OK;
+    }
+  }
+
+  return NS_ERROR_ILLEGAL_VALUE;
+}
+
+NS_IMETHODIMP
+inFlasher::GetThickness(uint16_t *aThickness)
+{
+  NS_PRECONDITION(aThickness, "Null pointer");
+  *aThickness = mThickness;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+inFlasher::SetThickness(uint16_t aThickness)
+{
+  mThickness = aThickness;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+inFlasher::GetInvert(bool *aInvert)
+{
+  NS_PRECONDITION(aInvert, "Null pointer");
+  *aInvert = mInvert;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+inFlasher::SetInvert(bool aInvert)
+{
+  mInvert = aInvert;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+inFlasher::RepaintElement(nsIDOMElement* aElement)
+{
+  NS_ENSURE_ARG_POINTER(aElement);
+  nsIFrame* frame = inLayoutUtils::GetFrameFor(aElement);
+  if (!frame) return NS_OK;
+
+  frame->InvalidateFrame();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+inFlasher::DrawElementOutline(nsIDOMElement* aElement)
+{
+  NS_ENSURE_ARG_POINTER(aElement);
+  nsCOMPtr<nsIDOMWindow> window = inLayoutUtils::GetWindowFor(aElement);
+  if (!window) return NS_OK;
+  nsCOMPtr<nsIPresShell> presShell = inLayoutUtils::GetPresShellFor(window);
+  if (!presShell) return NS_OK;
+
+  nsIFrame* frame = inLayoutUtils::GetFrameFor(aElement);
+
+  bool isFirstFrame = true;
+
+  while (frame) {
+    nsPoint offset;
+    nsIWidget* widget = frame->GetNearestWidget(offset);
+    if (widget) {
+      nsRefPtr<nsRenderingContext> rcontext = new nsRenderingContext();
+      rcontext->Init(frame->PresContext()->DeviceContext(),
+                     widget->GetThebesSurface());
+
+      nsRect rect(offset, frame->GetSize());
+      if (mInvert) {
+        rcontext->InvertRect(rect);
+      }
+
+      bool isLastFrame = frame->GetNextContinuation() == nullptr;
+      DrawOutline(rect.x, rect.y, rect.width, rect.height, rcontext,
+                  isFirstFrame, isLastFrame);
+      isFirstFrame = false;
+    }
+    frame = frame->GetNextContinuation();
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+inFlasher::ScrollElementIntoView(nsIDOMElement *aElement)
+{
+  NS_ENSURE_ARG_POINTER(aElement);
+  nsCOMPtr<nsIDOMWindow> window = inLayoutUtils::GetWindowFor(aElement);
+  if (!window) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIPresShell> presShell = inLayoutUtils::GetPresShellFor(window);
+  if (!presShell) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
+  presShell->ScrollContentIntoView(content,
+                                   nsIPresShell::ScrollAxis(),
+                                   nsIPresShell::ScrollAxis(),
+                                   nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
+
+  return NS_OK;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// inFlasher
+
+void
+inFlasher::DrawOutline(nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight,
+                       nsRenderingContext* aRenderContext,
+                       bool aDrawBegin, bool aDrawEnd)
+{
+  aRenderContext->SetColor(mColor);
+
+  DrawLine(aX, aY, aWidth, DIR_HORIZONTAL, BOUND_OUTER, aRenderContext);
+  if (aDrawBegin) {
+    DrawLine(aX, aY, aHeight, DIR_VERTICAL, BOUND_OUTER, aRenderContext);
+  }
+  DrawLine(aX, aY+aHeight, aWidth, DIR_HORIZONTAL, BOUND_INNER, aRenderContext);
+  if (aDrawEnd) {
+    DrawLine(aX+aWidth, aY, aHeight, DIR_VERTICAL, BOUND_INNER, aRenderContext);
+  }
+}
+
+void
+inFlasher::DrawLine(nscoord aX, nscoord aY, nscoord aLength,
+                    bool aDir, bool aBounds,
+                    nsRenderingContext* aRenderContext)
+{
+  nscoord thickTwips = nsPresContext::CSSPixelsToAppUnits(mThickness);
+  if (aDir) { // horizontal
+    aRenderContext->FillRect(aX, aY+(aBounds?0:-thickTwips), aLength, thickTwips);
+  } else { // vertical
+    aRenderContext->FillRect(aX+(aBounds?0:-thickTwips), aY, thickTwips, aLength);
+  }
+}