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-rw-r--r--dom/svg/SVGMotionSMILPathUtils.cpp137
1 files changed, 137 insertions, 0 deletions
diff --git a/dom/svg/SVGMotionSMILPathUtils.cpp b/dom/svg/SVGMotionSMILPathUtils.cpp
new file mode 100644
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+++ b/dom/svg/SVGMotionSMILPathUtils.cpp
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+/* -*- 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.GetValueInPixels(mSVGElement, SVGContentUtils::X);
+ float yRes = y.GetValueInPixels(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