153 lines
4.1 KiB
C++
153 lines
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SVGMotionSMILPathUtils.h"
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#include "nsCharSeparatedTokenizer.h"
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#include "nsContentUtils.h" // for NS_ENSURE_FINITE2
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#include "SVGContentUtils.h"
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#include "SVGLength.h"
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using namespace mozilla::gfx;
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namespace mozilla {
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//----------------------------------------------------------------------
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// PathGenerator methods
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// For the dummy 'from' value used in pure by-animation & to-animation
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void
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SVGMotionSMILPathUtils::PathGenerator::
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MoveToOrigin()
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{
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MOZ_ASSERT(!mHaveReceivedCommands,
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"Not expecting requests for mid-path MoveTo commands");
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mHaveReceivedCommands = true;
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mPathBuilder->MoveTo(Point(0, 0));
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}
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// For 'from' and the first entry in 'values'.
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bool
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SVGMotionSMILPathUtils::PathGenerator::
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MoveToAbsolute(const nsAString& aCoordPairStr)
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{
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MOZ_ASSERT(!mHaveReceivedCommands,
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"Not expecting requests for mid-path MoveTo commands");
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mHaveReceivedCommands = true;
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float xVal, yVal;
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if (!ParseCoordinatePair(aCoordPairStr, xVal, yVal)) {
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return false;
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}
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mPathBuilder->MoveTo(Point(xVal, yVal));
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return true;
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}
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// For 'to' and every entry in 'values' except the first.
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bool
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SVGMotionSMILPathUtils::PathGenerator::
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LineToAbsolute(const nsAString& aCoordPairStr, double& aSegmentDistance)
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{
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mHaveReceivedCommands = true;
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float xVal, yVal;
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if (!ParseCoordinatePair(aCoordPairStr, xVal, yVal)) {
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return false;
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}
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Point initialPoint = mPathBuilder->CurrentPoint();
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mPathBuilder->LineTo(Point(xVal, yVal));
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aSegmentDistance = NS_hypot(initialPoint.x - xVal, initialPoint.y -yVal);
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return true;
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}
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// For 'by'.
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bool
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SVGMotionSMILPathUtils::PathGenerator::
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LineToRelative(const nsAString& aCoordPairStr, double& aSegmentDistance)
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{
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mHaveReceivedCommands = true;
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float xVal, yVal;
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if (!ParseCoordinatePair(aCoordPairStr, xVal, yVal)) {
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return false;
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}
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mPathBuilder->LineTo(mPathBuilder->CurrentPoint() + Point(xVal, yVal));
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aSegmentDistance = NS_hypot(xVal, yVal);
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return true;
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}
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already_AddRefed<Path>
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SVGMotionSMILPathUtils::PathGenerator::GetResultingPath()
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{
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return mPathBuilder->Finish();
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}
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//----------------------------------------------------------------------
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// Helper / protected methods
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bool
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SVGMotionSMILPathUtils::PathGenerator::
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ParseCoordinatePair(const nsAString& aCoordPairStr,
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float& aXVal, float& aYVal)
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{
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nsCharSeparatedTokenizerTemplate<IsSVGWhitespace>
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tokenizer(aCoordPairStr, ',',
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nsCharSeparatedTokenizer::SEPARATOR_OPTIONAL);
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SVGLength x, y;
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if (!tokenizer.hasMoreTokens() ||
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!x.SetValueFromString(tokenizer.nextToken())) {
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return false;
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}
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if (!tokenizer.hasMoreTokens() ||
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!y.SetValueFromString(tokenizer.nextToken())) {
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return false;
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}
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if (tokenizer.separatorAfterCurrentToken() || // Trailing comma.
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tokenizer.hasMoreTokens()) { // More text remains
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return false;
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}
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float xRes = x.GetValueInUserUnits(mSVGElement, SVGContentUtils::X);
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float yRes = y.GetValueInUserUnits(mSVGElement, SVGContentUtils::Y);
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NS_ENSURE_FINITE2(xRes, yRes, false);
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aXVal = xRes;
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aYVal = yRes;
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return true;
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}
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//----------------------------------------------------------------------
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// MotionValueParser methods
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bool
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SVGMotionSMILPathUtils::MotionValueParser::
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Parse(const nsAString& aValueStr)
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{
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bool success;
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if (!mPathGenerator->HaveReceivedCommands()) {
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// Interpret first value in "values" attribute as the path's initial MoveTo
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success = mPathGenerator->MoveToAbsolute(aValueStr);
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if (success) {
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success = !!mPointDistances->AppendElement(0.0, fallible);
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}
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} else {
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double dist;
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success = mPathGenerator->LineToAbsolute(aValueStr, dist);
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if (success) {
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mDistanceSoFar += dist;
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success = !!mPointDistances->AppendElement(mDistanceSoFar, fallible);
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}
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}
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return success;
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}
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} // namespace mozilla
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