gecko-dev/dom/svg/nsSVGLength2.cpp

526 строки
13 KiB
C++

/* -*- 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 "mozilla/ArrayUtils.h"
#include "nsSVGLength2.h"
#include "mozilla/dom/SVGAnimatedLength.h"
#include "mozilla/dom/SVGSVGElement.h"
#include "nsContentUtils.h" // NS_ENSURE_FINITE
#include "nsIFrame.h"
#include "nsSMILFloatType.h"
#include "nsSMILValue.h"
#include "nsSVGAttrTearoffTable.h"
#include "nsSVGIntegrationUtils.h"
#include "nsTextFormatter.h"
#include "DOMSVGLength.h"
#include "LayoutLogging.h"
using namespace mozilla;
using namespace mozilla::dom;
static nsIAtom** const unitMap[] =
{
nullptr, /* SVG_LENGTHTYPE_UNKNOWN */
nullptr, /* SVG_LENGTHTYPE_NUMBER */
&nsGkAtoms::percentage,
&nsGkAtoms::em,
&nsGkAtoms::ex,
&nsGkAtoms::px,
&nsGkAtoms::cm,
&nsGkAtoms::mm,
&nsGkAtoms::in,
&nsGkAtoms::pt,
&nsGkAtoms::pc
};
static nsSVGAttrTearoffTable<nsSVGLength2, SVGAnimatedLength>
sSVGAnimatedLengthTearoffTable;
/* Helper functions */
static bool
IsValidUnitType(uint16_t unit)
{
if (unit > nsIDOMSVGLength::SVG_LENGTHTYPE_UNKNOWN &&
unit <= nsIDOMSVGLength::SVG_LENGTHTYPE_PC)
return true;
return false;
}
static void
GetUnitString(nsAString& unit, uint16_t unitType)
{
if (IsValidUnitType(unitType)) {
if (unitMap[unitType]) {
(*unitMap[unitType])->ToString(unit);
}
return;
}
NS_NOTREACHED("Unknown unit type");
return;
}
static uint16_t
GetUnitTypeForString(const nsAString& unitStr)
{
if (unitStr.IsEmpty())
return nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER;
nsIAtom *unitAtom = NS_GetStaticAtom(unitStr);
if (unitAtom) {
for (uint32_t i = 0 ; i < ArrayLength(unitMap) ; i++) {
if (unitMap[i] && *unitMap[i] == unitAtom) {
return i;
}
}
}
return nsIDOMSVGLength::SVG_LENGTHTYPE_UNKNOWN;
}
static void
GetValueString(nsAString &aValueAsString, float aValue, uint16_t aUnitType)
{
char16_t buf[24];
nsTextFormatter::snprintf(buf, sizeof(buf)/sizeof(char16_t),
MOZ_UTF16("%g"),
(double)aValue);
aValueAsString.Assign(buf);
nsAutoString unitString;
GetUnitString(unitString, aUnitType);
aValueAsString.Append(unitString);
}
static bool
GetValueFromString(const nsAString& aString,
float& aValue,
uint16_t* aUnitType)
{
RangedPtr<const char16_t> iter =
SVGContentUtils::GetStartRangedPtr(aString);
const RangedPtr<const char16_t> end =
SVGContentUtils::GetEndRangedPtr(aString);
if (!SVGContentUtils::ParseNumber(iter, end, aValue)) {
return false;
}
const nsAString& units = Substring(iter.get(), end.get());
*aUnitType = GetUnitTypeForString(units);
return IsValidUnitType(*aUnitType);
}
static float GetMMPerPixel() { return MM_PER_INCH_FLOAT / 96; }
static float
FixAxisLength(float aLength)
{
if (aLength == 0.0f) {
LAYOUT_WARNING("zero axis length");
return 1e-20f;
}
return aLength;
}
SVGElementMetrics::SVGElementMetrics(nsSVGElement* aSVGElement,
SVGSVGElement* aCtx)
: mSVGElement(aSVGElement)
, mCtx(aCtx)
{
}
float
SVGElementMetrics::GetEmLength() const
{
return SVGContentUtils::GetFontSize(mSVGElement);
}
float
SVGElementMetrics::GetExLength() const
{
return SVGContentUtils::GetFontXHeight(mSVGElement);
}
float
SVGElementMetrics::GetAxisLength(uint8_t aCtxType) const
{
if (!EnsureCtx()) {
return 1;
}
return FixAxisLength(mCtx->GetLength(aCtxType));
}
bool
SVGElementMetrics::EnsureCtx() const
{
if (!mCtx && mSVGElement) {
mCtx = mSVGElement->GetCtx();
}
return mCtx != nullptr;
}
NonSVGFrameUserSpaceMetrics::NonSVGFrameUserSpaceMetrics(nsIFrame* aFrame)
: mFrame(aFrame)
{
}
float
NonSVGFrameUserSpaceMetrics::GetEmLength() const
{
return SVGContentUtils::GetFontSize(mFrame);
}
float
NonSVGFrameUserSpaceMetrics::GetExLength() const
{
return SVGContentUtils::GetFontXHeight(mFrame);
}
gfx::Size
NonSVGFrameUserSpaceMetrics::GetSize() const
{
return nsSVGIntegrationUtils::GetSVGCoordContextForNonSVGFrame(mFrame);
}
float
UserSpaceMetricsWithSize::GetAxisLength(uint8_t aCtxType) const
{
gfx::Size size = GetSize();
float length;
switch (aCtxType) {
case SVGContentUtils::X:
length = size.width;
break;
case SVGContentUtils::Y:
length = size.height;
break;
case SVGContentUtils::XY:
length = SVGContentUtils::ComputeNormalizedHypotenuse(size.width, size.height);
break;
default:
NS_NOTREACHED("Unknown axis type");
length = 1;
break;
}
return FixAxisLength(length);
}
float
nsSVGLength2::GetUnitScaleFactor(nsSVGElement *aSVGElement,
uint8_t aUnitType) const
{
return GetUnitScaleFactor(SVGElementMetrics(aSVGElement), aUnitType);
}
float
nsSVGLength2::GetUnitScaleFactor(SVGSVGElement *aCtx, uint8_t aUnitType) const
{
return GetUnitScaleFactor(SVGElementMetrics(aCtx, aCtx), aUnitType);
}
float
nsSVGLength2::GetUnitScaleFactor(nsIFrame *aFrame, uint8_t aUnitType) const
{
nsIContent* content = aFrame->GetContent();
if (content->IsSVGElement()) {
return GetUnitScaleFactor(SVGElementMetrics(static_cast<nsSVGElement*>(content)), aUnitType);
}
return GetUnitScaleFactor(NonSVGFrameUserSpaceMetrics(aFrame), aUnitType);
}
float
nsSVGLength2::GetUnitScaleFactor(const UserSpaceMetrics& aMetrics, uint8_t aUnitType) const
{
switch (aUnitType) {
case nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER:
case nsIDOMSVGLength::SVG_LENGTHTYPE_PX:
return 1;
case nsIDOMSVGLength::SVG_LENGTHTYPE_MM:
return GetMMPerPixel();
case nsIDOMSVGLength::SVG_LENGTHTYPE_CM:
return GetMMPerPixel() / 10.0f;
case nsIDOMSVGLength::SVG_LENGTHTYPE_IN:
return GetMMPerPixel() / MM_PER_INCH_FLOAT;
case nsIDOMSVGLength::SVG_LENGTHTYPE_PT:
return GetMMPerPixel() * POINTS_PER_INCH_FLOAT / MM_PER_INCH_FLOAT;
case nsIDOMSVGLength::SVG_LENGTHTYPE_PC:
return GetMMPerPixel() * POINTS_PER_INCH_FLOAT / MM_PER_INCH_FLOAT / 12.0f;
case nsIDOMSVGLength::SVG_LENGTHTYPE_PERCENTAGE:
return 100.0f / aMetrics.GetAxisLength(mCtxType);
case nsIDOMSVGLength::SVG_LENGTHTYPE_EMS:
return 1 / aMetrics.GetEmLength();
case nsIDOMSVGLength::SVG_LENGTHTYPE_EXS:
return 1 / aMetrics.GetExLength();
default:
NS_NOTREACHED("Unknown unit type");
return 0;
}
}
void
nsSVGLength2::SetBaseValueInSpecifiedUnits(float aValue,
nsSVGElement *aSVGElement,
bool aDoSetAttr)
{
if (mIsBaseSet && mBaseVal == aValue) {
return;
}
nsAttrValue emptyOrOldValue;
if (aDoSetAttr) {
emptyOrOldValue = aSVGElement->WillChangeLength(mAttrEnum);
}
mBaseVal = aValue;
mIsBaseSet = true;
if (!mIsAnimated) {
mAnimVal = mBaseVal;
}
else {
aSVGElement->AnimationNeedsResample();
}
if (aDoSetAttr) {
aSVGElement->DidChangeLength(mAttrEnum, emptyOrOldValue);
}
}
nsresult
nsSVGLength2::ConvertToSpecifiedUnits(uint16_t unitType,
nsSVGElement *aSVGElement)
{
if (!IsValidUnitType(unitType))
return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
if (mIsBaseSet && mSpecifiedUnitType == uint8_t(unitType))
return NS_OK;
// Even though we're not changing the visual effect this length will have
// on the document, we still need to send out notifications in case we have
// mutation listeners, since the actual string value of the attribute will
// change.
nsAttrValue emptyOrOldValue = aSVGElement->WillChangeLength(mAttrEnum);
float valueInUserUnits =
mBaseVal / GetUnitScaleFactor(aSVGElement, mSpecifiedUnitType);
mSpecifiedUnitType = uint8_t(unitType);
// Setting aDoSetAttr to false here will ensure we don't call
// Will/DidChangeAngle a second time (and dispatch duplicate notifications).
SetBaseValue(valueInUserUnits, aSVGElement, false);
aSVGElement->DidChangeLength(mAttrEnum, emptyOrOldValue);
return NS_OK;
}
nsresult
nsSVGLength2::NewValueSpecifiedUnits(uint16_t unitType,
float valueInSpecifiedUnits,
nsSVGElement *aSVGElement)
{
NS_ENSURE_FINITE(valueInSpecifiedUnits, NS_ERROR_ILLEGAL_VALUE);
if (!IsValidUnitType(unitType))
return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
if (mIsBaseSet && mBaseVal == valueInSpecifiedUnits &&
mSpecifiedUnitType == uint8_t(unitType)) {
return NS_OK;
}
nsAttrValue emptyOrOldValue = aSVGElement->WillChangeLength(mAttrEnum);
mBaseVal = valueInSpecifiedUnits;
mIsBaseSet = true;
mSpecifiedUnitType = uint8_t(unitType);
if (!mIsAnimated) {
mAnimVal = mBaseVal;
}
else {
aSVGElement->AnimationNeedsResample();
}
aSVGElement->DidChangeLength(mAttrEnum, emptyOrOldValue);
return NS_OK;
}
nsresult
nsSVGLength2::ToDOMBaseVal(DOMSVGLength **aResult, nsSVGElement *aSVGElement)
{
RefPtr<DOMSVGLength> domBaseVal =
DOMSVGLength::GetTearOff(this, aSVGElement, false);
domBaseVal.forget(aResult);
return NS_OK;
}
nsresult
nsSVGLength2::ToDOMAnimVal(DOMSVGLength **aResult, nsSVGElement *aSVGElement)
{
RefPtr<DOMSVGLength> domAnimVal =
DOMSVGLength::GetTearOff(this, aSVGElement, true);
domAnimVal.forget(aResult);
return NS_OK;
}
/* Implementation */
nsresult
nsSVGLength2::SetBaseValueString(const nsAString &aValueAsString,
nsSVGElement *aSVGElement,
bool aDoSetAttr)
{
float value;
uint16_t unitType;
if (!GetValueFromString(aValueAsString, value, &unitType)) {
return NS_ERROR_DOM_SYNTAX_ERR;
}
if (mIsBaseSet && mBaseVal == float(value) &&
mSpecifiedUnitType == uint8_t(unitType)) {
return NS_OK;
}
nsAttrValue emptyOrOldValue;
if (aDoSetAttr) {
emptyOrOldValue = aSVGElement->WillChangeLength(mAttrEnum);
}
mBaseVal = value;
mIsBaseSet = true;
mSpecifiedUnitType = uint8_t(unitType);
if (!mIsAnimated) {
mAnimVal = mBaseVal;
}
else {
aSVGElement->AnimationNeedsResample();
}
if (aDoSetAttr) {
aSVGElement->DidChangeLength(mAttrEnum, emptyOrOldValue);
}
return NS_OK;
}
void
nsSVGLength2::GetBaseValueString(nsAString & aValueAsString) const
{
GetValueString(aValueAsString, mBaseVal, mSpecifiedUnitType);
}
void
nsSVGLength2::GetAnimValueString(nsAString & aValueAsString) const
{
GetValueString(aValueAsString, mAnimVal, mSpecifiedUnitType);
}
void
nsSVGLength2::SetBaseValue(float aValue, nsSVGElement *aSVGElement,
bool aDoSetAttr)
{
SetBaseValueInSpecifiedUnits(aValue * GetUnitScaleFactor(aSVGElement,
mSpecifiedUnitType),
aSVGElement, aDoSetAttr);
}
void
nsSVGLength2::SetAnimValueInSpecifiedUnits(float aValue,
nsSVGElement* aSVGElement)
{
if (mAnimVal == aValue && mIsAnimated) {
return;
}
mAnimVal = aValue;
mIsAnimated = true;
aSVGElement->DidAnimateLength(mAttrEnum);
}
void
nsSVGLength2::SetAnimValue(float aValue, nsSVGElement *aSVGElement)
{
SetAnimValueInSpecifiedUnits(aValue * GetUnitScaleFactor(aSVGElement,
mSpecifiedUnitType),
aSVGElement);
}
already_AddRefed<SVGAnimatedLength>
nsSVGLength2::ToDOMAnimatedLength(nsSVGElement* aSVGElement)
{
RefPtr<SVGAnimatedLength> svgAnimatedLength =
sSVGAnimatedLengthTearoffTable.GetTearoff(this);
if (!svgAnimatedLength) {
svgAnimatedLength = new SVGAnimatedLength(this, aSVGElement);
sSVGAnimatedLengthTearoffTable.AddTearoff(this, svgAnimatedLength);
}
return svgAnimatedLength.forget();
}
SVGAnimatedLength::~SVGAnimatedLength()
{
sSVGAnimatedLengthTearoffTable.RemoveTearoff(mVal);
}
nsISMILAttr*
nsSVGLength2::ToSMILAttr(nsSVGElement *aSVGElement)
{
return new SMILLength(this, aSVGElement);
}
nsresult
nsSVGLength2::SMILLength::ValueFromString(const nsAString& aStr,
const SVGAnimationElement* /*aSrcElement*/,
nsSMILValue& aValue,
bool& aPreventCachingOfSandwich) const
{
float value;
uint16_t unitType;
if (!GetValueFromString(aStr, value, &unitType)) {
return NS_ERROR_DOM_SYNTAX_ERR;
}
nsSMILValue val(nsSMILFloatType::Singleton());
val.mU.mDouble = value / mVal->GetUnitScaleFactor(mSVGElement, unitType);
aValue = val;
aPreventCachingOfSandwich =
(unitType == nsIDOMSVGLength::SVG_LENGTHTYPE_PERCENTAGE ||
unitType == nsIDOMSVGLength::SVG_LENGTHTYPE_EMS ||
unitType == nsIDOMSVGLength::SVG_LENGTHTYPE_EXS);
return NS_OK;
}
nsSMILValue
nsSVGLength2::SMILLength::GetBaseValue() const
{
nsSMILValue val(nsSMILFloatType::Singleton());
val.mU.mDouble = mVal->GetBaseValue(mSVGElement);
return val;
}
void
nsSVGLength2::SMILLength::ClearAnimValue()
{
if (mVal->mIsAnimated) {
mVal->mIsAnimated = false;
mVal->mAnimVal = mVal->mBaseVal;
mSVGElement->DidAnimateLength(mVal->mAttrEnum);
}
}
nsresult
nsSVGLength2::SMILLength::SetAnimValue(const nsSMILValue& aValue)
{
NS_ASSERTION(aValue.mType == nsSMILFloatType::Singleton(),
"Unexpected type to assign animated value");
if (aValue.mType == nsSMILFloatType::Singleton()) {
mVal->SetAnimValue(float(aValue.mU.mDouble), mSVGElement);
}
return NS_OK;
}