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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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<IsSVGWhitespace>
tokenizer(aCoordPairStr, ',',
nsCharSeparatedTokenizer::SEPARATOR_OPTIONAL);
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
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