зеркало из https://github.com/mozilla/gecko-dev.git
464 строки
14 KiB
C++
464 строки
14 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 "nsSVGLength2.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/SMILValue.h"
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#include "mozilla/dom/SVGAnimatedLength.h"
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#include "mozilla/dom/SVGViewportElement.h"
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#include "nsContentUtils.h"
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#include "DOMSVGLength.h"
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#include "nsIFrame.h"
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#include "LayoutLogging.h"
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#include "SMILFloatType.h"
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#include "SVGAttrTearoffTable.h"
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#include "nsSVGIntegrationUtils.h"
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#include "nsTextFormatter.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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static const nsStaticAtom* const unitMap[] = {
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nullptr, /* SVG_LENGTHTYPE_UNKNOWN */
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nullptr, /* SVG_LENGTHTYPE_NUMBER */
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nsGkAtoms::percentage,
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nsGkAtoms::em,
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nsGkAtoms::ex,
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nsGkAtoms::px,
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nsGkAtoms::cm,
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nsGkAtoms::mm,
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nsGkAtoms::in,
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nsGkAtoms::pt,
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nsGkAtoms::pc};
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static SVGAttrTearoffTable<nsSVGLength2, SVGAnimatedLength>
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sSVGAnimatedLengthTearoffTable;
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/* Helper functions */
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static bool IsValidUnitType(uint16_t unit) {
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if (unit > SVGLength_Binding::SVG_LENGTHTYPE_UNKNOWN &&
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unit <= SVGLength_Binding::SVG_LENGTHTYPE_PC)
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return true;
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return false;
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}
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static void GetUnitString(nsAString& unit, uint16_t unitType) {
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if (IsValidUnitType(unitType)) {
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if (unitMap[unitType]) {
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unitMap[unitType]->ToString(unit);
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}
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return;
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}
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MOZ_ASSERT_UNREACHABLE("Unknown unit type");
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}
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static uint16_t GetUnitTypeForString(const nsAString& unitStr) {
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if (unitStr.IsEmpty()) return SVGLength_Binding::SVG_LENGTHTYPE_NUMBER;
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nsAtom* unitAtom = NS_GetStaticAtom(unitStr);
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if (unitAtom) {
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for (uint32_t i = 0; i < ArrayLength(unitMap); i++) {
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if (unitMap[i] == unitAtom) {
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return i;
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}
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}
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}
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return SVGLength_Binding::SVG_LENGTHTYPE_UNKNOWN;
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}
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static void GetValueString(nsAString& aValueAsString, float aValue,
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uint16_t aUnitType) {
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nsTextFormatter::ssprintf(aValueAsString, u"%g", (double)aValue);
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nsAutoString unitString;
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GetUnitString(unitString, aUnitType);
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aValueAsString.Append(unitString);
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}
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static bool GetValueFromString(const nsAString& aString, float& aValue,
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uint16_t* aUnitType) {
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RangedPtr<const char16_t> iter = SVGContentUtils::GetStartRangedPtr(aString);
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const RangedPtr<const char16_t> end =
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SVGContentUtils::GetEndRangedPtr(aString);
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if (!SVGContentUtils::ParseNumber(iter, end, aValue)) {
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return false;
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}
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const nsAString& units = Substring(iter.get(), end.get());
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*aUnitType = GetUnitTypeForString(units);
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return IsValidUnitType(*aUnitType);
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}
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static float FixAxisLength(float aLength) {
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if (aLength == 0.0f) {
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LAYOUT_WARNING("zero axis length");
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return 1e-20f;
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}
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return aLength;
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}
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SVGElementMetrics::SVGElementMetrics(SVGElement* aSVGElement,
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SVGViewportElement* aCtx)
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: mSVGElement(aSVGElement), mCtx(aCtx) {}
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float SVGElementMetrics::GetEmLength() const {
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return SVGContentUtils::GetFontSize(mSVGElement);
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}
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float SVGElementMetrics::GetExLength() const {
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return SVGContentUtils::GetFontXHeight(mSVGElement);
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}
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float SVGElementMetrics::GetAxisLength(uint8_t aCtxType) const {
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if (!EnsureCtx()) {
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return 1;
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}
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return FixAxisLength(mCtx->GetLength(aCtxType));
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}
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bool SVGElementMetrics::EnsureCtx() const {
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if (!mCtx && mSVGElement) {
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mCtx = mSVGElement->GetCtx();
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if (!mCtx && mSVGElement->IsSVGElement(nsGkAtoms::svg)) {
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// mSVGElement must be the outer svg element
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mCtx = static_cast<SVGViewportElement*>(mSVGElement);
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}
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}
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return mCtx != nullptr;
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}
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NonSVGFrameUserSpaceMetrics::NonSVGFrameUserSpaceMetrics(nsIFrame* aFrame)
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: mFrame(aFrame) {}
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float NonSVGFrameUserSpaceMetrics::GetEmLength() const {
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return SVGContentUtils::GetFontSize(mFrame);
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}
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float NonSVGFrameUserSpaceMetrics::GetExLength() const {
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return SVGContentUtils::GetFontXHeight(mFrame);
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}
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gfx::Size NonSVGFrameUserSpaceMetrics::GetSize() const {
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return nsSVGIntegrationUtils::GetSVGCoordContextForNonSVGFrame(mFrame);
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}
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float UserSpaceMetricsWithSize::GetAxisLength(uint8_t aCtxType) const {
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gfx::Size size = GetSize();
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float length;
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switch (aCtxType) {
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case SVGContentUtils::X:
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length = size.width;
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break;
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case SVGContentUtils::Y:
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length = size.height;
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break;
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case SVGContentUtils::XY:
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length =
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SVGContentUtils::ComputeNormalizedHypotenuse(size.width, size.height);
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break;
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default:
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MOZ_ASSERT_UNREACHABLE("Unknown axis type");
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length = 1;
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break;
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}
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return FixAxisLength(length);
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}
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float nsSVGLength2::GetPixelsPerUnit(SVGElement* aSVGElement,
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uint8_t aUnitType) const {
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return GetPixelsPerUnit(SVGElementMetrics(aSVGElement), aUnitType);
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}
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float nsSVGLength2::GetPixelsPerUnit(SVGViewportElement* aCtx,
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uint8_t aUnitType) const {
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return GetPixelsPerUnit(SVGElementMetrics(aCtx, aCtx), aUnitType);
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}
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float nsSVGLength2::GetPixelsPerUnit(nsIFrame* aFrame,
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uint8_t aUnitType) const {
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nsIContent* content = aFrame->GetContent();
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if (content->IsSVGElement()) {
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return GetPixelsPerUnit(
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SVGElementMetrics(static_cast<SVGElement*>(content)), aUnitType);
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}
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return GetPixelsPerUnit(NonSVGFrameUserSpaceMetrics(aFrame), aUnitType);
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}
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// See https://www.w3.org/TR/css-values-3/#absolute-lengths
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static const float DPI = 96.0f;
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float nsSVGLength2::GetPixelsPerUnit(const UserSpaceMetrics& aMetrics,
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uint8_t aUnitType) const {
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switch (aUnitType) {
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case SVGLength_Binding::SVG_LENGTHTYPE_NUMBER:
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case SVGLength_Binding::SVG_LENGTHTYPE_PX:
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return 1;
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case SVGLength_Binding::SVG_LENGTHTYPE_MM:
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return DPI / MM_PER_INCH_FLOAT;
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case SVGLength_Binding::SVG_LENGTHTYPE_CM:
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return 10.0f * DPI / MM_PER_INCH_FLOAT;
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case SVGLength_Binding::SVG_LENGTHTYPE_IN:
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return DPI;
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case SVGLength_Binding::SVG_LENGTHTYPE_PT:
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return DPI / POINTS_PER_INCH_FLOAT;
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case SVGLength_Binding::SVG_LENGTHTYPE_PC:
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return 12.0f * DPI / POINTS_PER_INCH_FLOAT;
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case SVGLength_Binding::SVG_LENGTHTYPE_PERCENTAGE:
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return aMetrics.GetAxisLength(mCtxType) / 100.0f;
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case SVGLength_Binding::SVG_LENGTHTYPE_EMS:
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return aMetrics.GetEmLength();
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case SVGLength_Binding::SVG_LENGTHTYPE_EXS:
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return aMetrics.GetExLength();
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default:
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MOZ_ASSERT_UNREACHABLE("Unknown unit type");
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return 0;
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}
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}
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void nsSVGLength2::SetBaseValueInSpecifiedUnits(float aValue,
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SVGElement* aSVGElement,
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bool aDoSetAttr) {
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if (mIsBaseSet && mBaseVal == aValue) {
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return;
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}
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nsAttrValue emptyOrOldValue;
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if (aDoSetAttr) {
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emptyOrOldValue = aSVGElement->WillChangeLength(mAttrEnum);
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}
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mBaseVal = aValue;
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mIsBaseSet = true;
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if (!mIsAnimated) {
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mAnimVal = mBaseVal;
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} else {
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aSVGElement->AnimationNeedsResample();
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}
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if (aDoSetAttr) {
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aSVGElement->DidChangeLength(mAttrEnum, emptyOrOldValue);
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}
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}
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nsresult nsSVGLength2::ConvertToSpecifiedUnits(uint16_t unitType,
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SVGElement* aSVGElement) {
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if (!IsValidUnitType(unitType)) return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
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if (mIsBaseSet && mSpecifiedUnitType == uint8_t(unitType)) return NS_OK;
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float pixelsPerUnit = GetPixelsPerUnit(aSVGElement, unitType);
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if (pixelsPerUnit == 0.0f) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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float valueInUserUnits =
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mBaseVal * GetPixelsPerUnit(aSVGElement, mSpecifiedUnitType);
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float valueInSpecifiedUnits = valueInUserUnits / pixelsPerUnit;
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if (!IsFinite(valueInSpecifiedUnits)) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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// Even though we're not changing the visual effect this length will have
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// on the document, we still need to send out notifications in case we have
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// mutation listeners, since the actual string value of the attribute will
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// change.
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nsAttrValue emptyOrOldValue = aSVGElement->WillChangeLength(mAttrEnum);
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mSpecifiedUnitType = uint8_t(unitType);
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// Setting aDoSetAttr to false here will ensure we don't call
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// Will/DidChangeAngle a second time (and dispatch duplicate notifications).
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SetBaseValueInSpecifiedUnits(valueInSpecifiedUnits, aSVGElement, false);
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aSVGElement->DidChangeLength(mAttrEnum, emptyOrOldValue);
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return NS_OK;
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}
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nsresult nsSVGLength2::NewValueSpecifiedUnits(uint16_t unitType,
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float valueInSpecifiedUnits,
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SVGElement* aSVGElement) {
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NS_ENSURE_FINITE(valueInSpecifiedUnits, NS_ERROR_ILLEGAL_VALUE);
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if (!IsValidUnitType(unitType)) return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
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if (mIsBaseSet && mBaseVal == valueInSpecifiedUnits &&
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mSpecifiedUnitType == uint8_t(unitType)) {
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return NS_OK;
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}
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nsAttrValue emptyOrOldValue = aSVGElement->WillChangeLength(mAttrEnum);
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mBaseVal = valueInSpecifiedUnits;
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mIsBaseSet = true;
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mSpecifiedUnitType = uint8_t(unitType);
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if (!mIsAnimated) {
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mAnimVal = mBaseVal;
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} else {
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aSVGElement->AnimationNeedsResample();
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}
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aSVGElement->DidChangeLength(mAttrEnum, emptyOrOldValue);
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return NS_OK;
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}
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already_AddRefed<DOMSVGLength> nsSVGLength2::ToDOMBaseVal(
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SVGElement* aSVGElement) {
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return DOMSVGLength::GetTearOff(this, aSVGElement, false);
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}
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already_AddRefed<DOMSVGLength> nsSVGLength2::ToDOMAnimVal(
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SVGElement* aSVGElement) {
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return DOMSVGLength::GetTearOff(this, aSVGElement, true);
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}
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/* Implementation */
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nsresult nsSVGLength2::SetBaseValueString(const nsAString& aValueAsString,
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SVGElement* aSVGElement,
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bool aDoSetAttr) {
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float value;
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uint16_t unitType;
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if (!GetValueFromString(aValueAsString, value, &unitType)) {
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return NS_ERROR_DOM_SYNTAX_ERR;
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}
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if (mIsBaseSet && mBaseVal == float(value) &&
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mSpecifiedUnitType == uint8_t(unitType)) {
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return NS_OK;
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}
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nsAttrValue emptyOrOldValue;
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if (aDoSetAttr) {
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emptyOrOldValue = aSVGElement->WillChangeLength(mAttrEnum);
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}
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mBaseVal = value;
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mIsBaseSet = true;
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mSpecifiedUnitType = uint8_t(unitType);
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if (!mIsAnimated) {
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mAnimVal = mBaseVal;
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} else {
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aSVGElement->AnimationNeedsResample();
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}
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if (aDoSetAttr) {
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aSVGElement->DidChangeLength(mAttrEnum, emptyOrOldValue);
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}
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return NS_OK;
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}
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void nsSVGLength2::GetBaseValueString(nsAString& aValueAsString) const {
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GetValueString(aValueAsString, mBaseVal, mSpecifiedUnitType);
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}
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void nsSVGLength2::GetAnimValueString(nsAString& aValueAsString) const {
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GetValueString(aValueAsString, mAnimVal, mSpecifiedUnitType);
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}
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nsresult nsSVGLength2::SetBaseValue(float aValue, SVGElement* aSVGElement,
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bool aDoSetAttr) {
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float pixelsPerUnit = GetPixelsPerUnit(aSVGElement, mSpecifiedUnitType);
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if (pixelsPerUnit == 0.0f) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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float valueInSpecifiedUnits = aValue / pixelsPerUnit;
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if (!IsFinite(valueInSpecifiedUnits)) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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SetBaseValueInSpecifiedUnits(valueInSpecifiedUnits, aSVGElement, aDoSetAttr);
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return NS_OK;
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}
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void nsSVGLength2::SetAnimValueInSpecifiedUnits(float aValue,
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SVGElement* aSVGElement) {
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if (mAnimVal == aValue && mIsAnimated) {
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return;
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}
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mAnimVal = aValue;
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mIsAnimated = true;
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aSVGElement->DidAnimateLength(mAttrEnum);
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}
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nsresult nsSVGLength2::SetAnimValue(float aValue, SVGElement* aSVGElement) {
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float valueInSpecifiedUnits =
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aValue / GetPixelsPerUnit(aSVGElement, mSpecifiedUnitType);
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if (IsFinite(valueInSpecifiedUnits)) {
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SetAnimValueInSpecifiedUnits(valueInSpecifiedUnits, aSVGElement);
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return NS_OK;
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}
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return NS_ERROR_ILLEGAL_VALUE;
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}
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already_AddRefed<SVGAnimatedLength> nsSVGLength2::ToDOMAnimatedLength(
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SVGElement* aSVGElement) {
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RefPtr<SVGAnimatedLength> svgAnimatedLength =
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sSVGAnimatedLengthTearoffTable.GetTearoff(this);
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if (!svgAnimatedLength) {
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svgAnimatedLength = new SVGAnimatedLength(this, aSVGElement);
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sSVGAnimatedLengthTearoffTable.AddTearoff(this, svgAnimatedLength);
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}
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return svgAnimatedLength.forget();
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}
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SVGAnimatedLength::~SVGAnimatedLength() {
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sSVGAnimatedLengthTearoffTable.RemoveTearoff(mVal);
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}
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UniquePtr<SMILAttr> nsSVGLength2::ToSMILAttr(SVGElement* aSVGElement) {
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return MakeUnique<SMILLength>(this, aSVGElement);
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}
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nsresult nsSVGLength2::SMILLength::ValueFromString(
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const nsAString& aStr, const SVGAnimationElement* /*aSrcElement*/,
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SMILValue& aValue, bool& aPreventCachingOfSandwich) const {
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float value;
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uint16_t unitType;
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if (!GetValueFromString(aStr, value, &unitType)) {
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return NS_ERROR_DOM_SYNTAX_ERR;
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}
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SMILValue val(SMILFloatType::Singleton());
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val.mU.mDouble = value * mVal->GetPixelsPerUnit(mSVGElement, unitType);
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aValue = val;
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aPreventCachingOfSandwich =
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(unitType == SVGLength_Binding::SVG_LENGTHTYPE_PERCENTAGE ||
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unitType == SVGLength_Binding::SVG_LENGTHTYPE_EMS ||
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unitType == SVGLength_Binding::SVG_LENGTHTYPE_EXS);
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return NS_OK;
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}
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SMILValue nsSVGLength2::SMILLength::GetBaseValue() const {
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SMILValue val(SMILFloatType::Singleton());
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val.mU.mDouble = mVal->GetBaseValue(mSVGElement);
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return val;
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}
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void nsSVGLength2::SMILLength::ClearAnimValue() {
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if (mVal->mIsAnimated) {
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mVal->mIsAnimated = false;
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mVal->mAnimVal = mVal->mBaseVal;
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mSVGElement->DidAnimateLength(mVal->mAttrEnum);
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}
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}
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nsresult nsSVGLength2::SMILLength::SetAnimValue(const SMILValue& aValue) {
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NS_ASSERTION(aValue.mType == SMILFloatType::Singleton(),
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"Unexpected type to assign animated value");
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if (aValue.mType == SMILFloatType::Singleton()) {
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return mVal->SetAnimValue(float(aValue.mU.mDouble), mSVGElement);
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}
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return NS_OK;
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}
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