1 files changed, 137 insertions, 0 deletions
diff --git a/dom/svg/SVGMotionSMILPathUtils.cpp b/dom/svg/SVGMotionSMILPathUtils.cpp
new file mode 100644
index 0000000000..628b3622c1
--- /dev/null
+++ b/dom/svg/SVGMotionSMILPathUtils.cpp
@@ -0,0 +1,137 @@
+/* -*- 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/. */
+
+#include "SVGMotionSMILPathUtils.h"
+
+#include "nsCharSeparatedTokenizer.h"
+#include "nsContentUtils.h"  // for NS_ENSURE_FINITE2
+#include "SVGContentUtils.h"
+#include "SVGLength.h"
+
+using namespace mozilla::gfx;
+
+namespace mozilla {
+
+//----------------------------------------------------------------------
+// PathGenerator methods
+
+// For the dummy 'from' value used in pure by-animation & to-animation
+void SVGMotionSMILPathUtils::PathGenerator::MoveToOrigin() {
+  MOZ_ASSERT(!mHaveReceivedCommands,
+             "Not expecting requests for mid-path MoveTo commands");
+  mHaveReceivedCommands = true;
+  mPathBuilder->MoveTo(Point(0, 0));
+}
+
+// For 'from' and the first entry in 'values'.
+bool SVGMotionSMILPathUtils::PathGenerator::MoveToAbsolute(
+    const nsAString& aCoordPairStr) {
+  MOZ_ASSERT(!mHaveReceivedCommands,
+             "Not expecting requests for mid-path MoveTo commands");
+  mHaveReceivedCommands = true;
+
+  float xVal, yVal;
+  if (!ParseCoordinatePair(aCoordPairStr, xVal, yVal)) {
+    return false;
+  }
+  mPathBuilder->MoveTo(Point(xVal, yVal));
+  return true;
+}
+
+// For 'to' and every entry in 'values' except the first.
+bool SVGMotionSMILPathUtils::PathGenerator::LineToAbsolute(
+    const nsAString& aCoordPairStr, double& aSegmentDistance) {
+  mHaveReceivedCommands = true;
+
+  float xVal, yVal;
+  if (!ParseCoordinatePair(aCoordPairStr, xVal, yVal)) {
+    return false;
+  }
+  Point initialPoint = mPathBuilder->CurrentPoint();
+
+  mPathBuilder->LineTo(Point(xVal, yVal));
+  aSegmentDistance = NS_hypot(initialPoint.x - xVal, initialPoint.y - yVal);
+  return true;
+}
+
+// For 'by'.
+bool SVGMotionSMILPathUtils::PathGenerator::LineToRelative(
+    const nsAString& aCoordPairStr, double& aSegmentDistance) {
+  mHaveReceivedCommands = true;
+
+  float xVal, yVal;
+  if (!ParseCoordinatePair(aCoordPairStr, xVal, yVal)) {
+    return false;
+  }
+  mPathBuilder->LineTo(mPathBuilder->CurrentPoint() + Point(xVal, yVal));
+  aSegmentDistance = NS_hypot(xVal, yVal);
+  return true;
+}
+
+already_AddRefed<Path>
+SVGMotionSMILPathUtils::PathGenerator::GetResultingPath() {
+  return mPathBuilder->Finish();
+}
+
+//----------------------------------------------------------------------
+// Helper / protected methods
+
+bool SVGMotionSMILPathUtils::PathGenerator::ParseCoordinatePair(
+    const nsAString& aCoordPairStr, float& aXVal, float& aYVal) {
+  nsCharSeparatedTokenizerTemplate<nsContentUtils::IsHTMLWhitespace,
+                                   nsTokenizerFlags::SeparatorOptional>
+      tokenizer(aCoordPairStr, ',');
+
+  SVGLength x, y;
+
+  if (!tokenizer.hasMoreTokens() ||
+      !x.SetValueFromString(tokenizer.nextToken())) {
+    return false;
+  }
+
+  if (!tokenizer.hasMoreTokens() ||
+      !y.SetValueFromString(tokenizer.nextToken())) {
+    return false;
+  }
+
+  if (tokenizer.separatorAfterCurrentToken() ||  // Trailing comma.
+      tokenizer.hasMoreTokens()) {               // More text remains
+    return false;
+  }
+
+  float xRes = x.GetValueInUserUnits(mSVGElement, SVGContentUtils::X);
+  float yRes = y.GetValueInUserUnits(mSVGElement, SVGContentUtils::Y);
+
+  NS_ENSURE_FINITE2(xRes, yRes, false);
+
+  aXVal = xRes;
+  aYVal = yRes;
+  return true;
+}
+
+//----------------------------------------------------------------------
+// MotionValueParser methods
+bool SVGMotionSMILPathUtils::MotionValueParser::Parse(
+    const nsAString& aValueStr) {
+  bool success;
+  if (!mPathGenerator->HaveReceivedCommands()) {
+    // Interpret first value in "values" attribute as the path's initial MoveTo
+    success = mPathGenerator->MoveToAbsolute(aValueStr);
+    if (success) {
+      success = !!mPointDistances->AppendElement(0.0, fallible);
+    }
+  } else {
+    double dist;
+    success = mPathGenerator->LineToAbsolute(aValueStr, dist);
+    if (success) {
+      mDistanceSoFar += dist;
+      success = !!mPointDistances->AppendElement(mDistanceSoFar, fallible);
+    }
+  }
+  return success;
+}
+
+}  // namespace mozilla