ef7a482816
Unit conversion happens in UserSpaceMetrics::ResolveAbsoluteUnit SVGLength::GetUserUnitsPerUnit SVGAnimatedLength::GetPixelsPerUnit If we do all the conversion in one place it's all much simpler if we want to add more units. We also want to standardise naming so that we don't use UserUnits for some methods and Pixels for others so let's standardise on Pixels. Differential Revision: https://phabricator.services.mozilla.com/D179438
138 lines
4.1 KiB
C++
138 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 SVGMotionSMILPathUtils::PathGenerator::MoveToOrigin() {
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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 SVGMotionSMILPathUtils::PathGenerator::MoveToAbsolute(
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const nsAString& aCoordPairStr) {
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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 SVGMotionSMILPathUtils::PathGenerator::LineToAbsolute(
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const nsAString& aCoordPairStr, double& aSegmentDistance) {
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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 SVGMotionSMILPathUtils::PathGenerator::LineToRelative(
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const nsAString& aCoordPairStr, double& aSegmentDistance) {
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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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return mPathBuilder->Finish();
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}
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//----------------------------------------------------------------------
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// Helper / protected methods
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bool SVGMotionSMILPathUtils::PathGenerator::ParseCoordinatePair(
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const nsAString& aCoordPairStr, float& aXVal, float& aYVal) {
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nsCharSeparatedTokenizerTemplate<nsContentUtils::IsHTMLWhitespace,
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nsTokenizerFlags::SeparatorOptional>
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tokenizer(aCoordPairStr, ',');
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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.GetValueInPixels(mSVGElement, SVGContentUtils::X);
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float yRes = y.GetValueInPixels(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 SVGMotionSMILPathUtils::MotionValueParser::Parse(
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const nsAString& aValueStr) {
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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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