import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/svg/SVGViewBoxSMILType.cpp

@@ -0,0 +1,138 @@
+/* -*- 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 "SVGViewBoxSMILType.h"
+#include "nsSMILValue.h"
+#include "nsSVGViewBox.h"
+#include "nsDebug.h"
+#include <math.h>
+
+namespace mozilla {
+  
+/*static*/ SVGViewBoxSMILType SVGViewBoxSMILType::sSingleton;
+
+void
+SVGViewBoxSMILType::Init(nsSMILValue& aValue) const
+{
+  MOZ_ASSERT(aValue.IsNull(), "Unexpected value type");
+
+  aValue.mU.mPtr = new nsSVGViewBoxRect();
+  aValue.mType = this;
+}
+
+void
+SVGViewBoxSMILType::Destroy(nsSMILValue& aValue) const
+{
+  NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value");
+  delete static_cast<nsSVGViewBoxRect*>(aValue.mU.mPtr);
+  aValue.mU.mPtr = nullptr;
+  aValue.mType = nsSMILNullType::Singleton();
+}
+
+nsresult
+SVGViewBoxSMILType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
+{
+  NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");
+  NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value");
+
+  const nsSVGViewBoxRect* src = static_cast<const nsSVGViewBoxRect*>(aSrc.mU.mPtr);
+  nsSVGViewBoxRect* dst = static_cast<nsSVGViewBoxRect*>(aDest.mU.mPtr);
+  *dst = *src;
+  return NS_OK;
+}
+
+bool
+SVGViewBoxSMILType::IsEqual(const nsSMILValue& aLeft,
+                            const nsSMILValue& aRight) const
+{
+  NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");
+  NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");
+
+  const nsSVGViewBoxRect* leftBox =
+    static_cast<const nsSVGViewBoxRect*>(aLeft.mU.mPtr);
+  const nsSVGViewBoxRect* rightBox =
+    static_cast<nsSVGViewBoxRect*>(aRight.mU.mPtr);
+  return *leftBox == *rightBox;
+}
+
+nsresult
+SVGViewBoxSMILType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
+                        uint32_t aCount) const
+{
+  NS_PRECONDITION(aValueToAdd.mType == aDest.mType,
+                  "Trying to add invalid types");
+  NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type");
+
+  // See https://bugzilla.mozilla.org/show_bug.cgi?id=541884#c3 and the two
+  // comments that follow that one for arguments for and against allowing
+  // viewBox to be additive.
+
+  return NS_ERROR_FAILURE;
+}
+
+nsresult
+SVGViewBoxSMILType::ComputeDistance(const nsSMILValue& aFrom,
+                                    const nsSMILValue& aTo,
+                                    double& aDistance) const
+{
+  NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types");
+  NS_PRECONDITION(aFrom.mType == this, "Unexpected source type");
+
+  const nsSVGViewBoxRect* from = static_cast<const nsSVGViewBoxRect*>(aFrom.mU.mPtr);
+  const nsSVGViewBoxRect* to = static_cast<const nsSVGViewBoxRect*>(aTo.mU.mPtr);
+
+  if (from->none || to->none) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // We use the distances between the edges rather than the difference between
+  // the x, y, width and height for the "distance". This is necessary in
+  // order for the "distance" result that we calculate to be the same for a
+  // given change in the left side as it is for an equal change in the opposite
+  // side. See https://bugzilla.mozilla.org/show_bug.cgi?id=541884#c12
+
+  float dLeft = to->x - from->x;
+  float dTop = to->y - from->y;
+  float dRight = ( to->x + to->width ) - ( from->x + from->width );
+  float dBottom = ( to->y + to->height ) - ( from->y + from->height );
+
+  aDistance = sqrt(dLeft*dLeft + dTop*dTop + dRight*dRight + dBottom*dBottom);
+
+  return NS_OK;
+}
+
+nsresult
+SVGViewBoxSMILType::Interpolate(const nsSMILValue& aStartVal,
+                                const nsSMILValue& aEndVal,
+                                double aUnitDistance,
+                                nsSMILValue& aResult) const
+{
+  NS_PRECONDITION(aStartVal.mType == aEndVal.mType,
+                  "Trying to interpolate different types");
+  NS_PRECONDITION(aStartVal.mType == this,
+                  "Unexpected types for interpolation");
+  NS_PRECONDITION(aResult.mType == this, "Unexpected result type");
+
+  const nsSVGViewBoxRect* start = static_cast<const nsSVGViewBoxRect*>(aStartVal.mU.mPtr);
+  const nsSVGViewBoxRect* end = static_cast<const nsSVGViewBoxRect*>(aEndVal.mU.mPtr);
+
+  if (start->none || end->none) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsSVGViewBoxRect* current = static_cast<nsSVGViewBoxRect*>(aResult.mU.mPtr);
+
+  float x = (start->x + (end->x - start->x) * aUnitDistance);
+  float y = (start->y + (end->y - start->y) * aUnitDistance);
+  float width = (start->width + (end->width - start->width) * aUnitDistance);
+  float height = (start->height + (end->height - start->height) * aUnitDistance);
+
+  *current = nsSVGViewBoxRect(x, y, width, height);
+  
+  return NS_OK;
+}
+
+} // namespace mozilla