gecko-dev/dom/svg/nsSVGViewBox.cpp
2016-06-01 09:21:03 -07:00

361 lines
9.5 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 "nsSVGViewBox.h"
#include "mozilla/Move.h"
#include "nsCharSeparatedTokenizer.h"
#include "nsSMILValue.h"
#include "nsTextFormatter.h"
#include "SVGContentUtils.h"
#include "SVGViewBoxSMILType.h"
#define NUM_VIEWBOX_COMPONENTS 4
using namespace mozilla;
/* Implementation of nsSVGViewBoxRect methods */
bool
nsSVGViewBoxRect::operator==(const nsSVGViewBoxRect& aOther) const
{
if (&aOther == this)
return true;
return (none && aOther.none) ||
(!none && !aOther.none &&
x == aOther.x &&
y == aOther.y &&
width == aOther.width &&
height == aOther.height);
}
/* Cycle collection macros for nsSVGViewBox */
NS_SVG_VAL_IMPL_CYCLE_COLLECTION_WRAPPERCACHED(nsSVGViewBox::DOMBaseVal, mSVGElement)
NS_SVG_VAL_IMPL_CYCLE_COLLECTION_WRAPPERCACHED(nsSVGViewBox::DOMAnimVal, mSVGElement)
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsSVGViewBox::DOMBaseVal)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsSVGViewBox::DOMBaseVal)
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsSVGViewBox::DOMAnimVal)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsSVGViewBox::DOMAnimVal)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsSVGViewBox::DOMBaseVal)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsSVGViewBox::DOMAnimVal)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
static nsSVGAttrTearoffTable<nsSVGViewBox, nsSVGViewBox::DOMBaseVal>
sBaseSVGViewBoxTearoffTable;
static nsSVGAttrTearoffTable<nsSVGViewBox, nsSVGViewBox::DOMAnimVal>
sAnimSVGViewBoxTearoffTable;
nsSVGAttrTearoffTable<nsSVGViewBox, dom::SVGAnimatedRect>
nsSVGViewBox::sSVGAnimatedRectTearoffTable;
/* Implementation of nsSVGViewBox methods */
void
nsSVGViewBox::Init()
{
mHasBaseVal = false;
// We shouldn't use mBaseVal for rendering (its usages should be guarded with
// "mHasBaseVal" checks), but just in case we do by accident, this will
// ensure that we treat it as "none" and ignore its numeric values:
mBaseVal.none = true;
mAnimVal = nullptr;
}
bool
nsSVGViewBox::HasRect() const
{
// Check mAnimVal if we have one; otherwise, check mBaseVal if we have one;
// otherwise, just return false (we clearly do not have a rect).
const nsSVGViewBoxRect* rect = mAnimVal;
if (!rect) {
if (!mHasBaseVal) {
// no anim val, no base val --> no viewbox rect
return false;
}
rect = &mBaseVal;
}
return !rect->none && rect->width >= 0 && rect->height >= 0;
}
void
nsSVGViewBox::SetAnimValue(const nsSVGViewBoxRect& aRect,
nsSVGElement *aSVGElement)
{
if (!mAnimVal) {
// it's okay if allocation fails - and no point in reporting that
mAnimVal = new nsSVGViewBoxRect(aRect);
} else {
if (aRect == *mAnimVal) {
return;
}
*mAnimVal = aRect;
}
aSVGElement->DidAnimateViewBox();
}
void
nsSVGViewBox::SetBaseValue(const nsSVGViewBoxRect& aRect,
nsSVGElement *aSVGElement)
{
if (!mHasBaseVal || mBaseVal == aRect) {
// This method is used to set a single x, y, width
// or height value. It can't create a base value
// as the other components may be undefined. We record
// the new value though, so as not to lose data.
mBaseVal = aRect;
return;
}
nsAttrValue emptyOrOldValue = aSVGElement->WillChangeViewBox();
mBaseVal = aRect;
mHasBaseVal = true;
aSVGElement->DidChangeViewBox(emptyOrOldValue);
if (mAnimVal) {
aSVGElement->AnimationNeedsResample();
}
}
static nsresult
ToSVGViewBoxRect(const nsAString& aStr, nsSVGViewBoxRect *aViewBox)
{
if (aStr.EqualsLiteral("none")) {
aViewBox->none = true;
return NS_OK;
}
nsCharSeparatedTokenizerTemplate<IsSVGWhitespace>
tokenizer(aStr, ',',
nsCharSeparatedTokenizer::SEPARATOR_OPTIONAL);
float vals[NUM_VIEWBOX_COMPONENTS];
uint32_t i;
for (i = 0; i < NUM_VIEWBOX_COMPONENTS && tokenizer.hasMoreTokens(); ++i) {
if (!SVGContentUtils::ParseNumber(tokenizer.nextToken(), vals[i])) {
return NS_ERROR_DOM_SYNTAX_ERR;
}
}
if (i != NUM_VIEWBOX_COMPONENTS || // Too few values.
tokenizer.hasMoreTokens() || // Too many values.
tokenizer.separatorAfterCurrentToken()) { // Trailing comma.
return NS_ERROR_DOM_SYNTAX_ERR;
}
aViewBox->x = vals[0];
aViewBox->y = vals[1];
aViewBox->width = vals[2];
aViewBox->height = vals[3];
aViewBox->none = false;
return NS_OK;
}
nsresult
nsSVGViewBox::SetBaseValueString(const nsAString& aValue,
nsSVGElement *aSVGElement,
bool aDoSetAttr)
{
nsSVGViewBoxRect viewBox;
nsresult rv = ToSVGViewBoxRect(aValue, &viewBox);
if (NS_FAILED(rv)) {
return rv;
}
// Comparison against mBaseVal is only valid if we currently have a base val.
if (mHasBaseVal && viewBox == mBaseVal) {
return NS_OK;
}
nsAttrValue emptyOrOldValue;
if (aDoSetAttr) {
emptyOrOldValue = aSVGElement->WillChangeViewBox();
}
mHasBaseVal = true;
mBaseVal = viewBox;
if (aDoSetAttr) {
aSVGElement->DidChangeViewBox(emptyOrOldValue);
}
if (mAnimVal) {
aSVGElement->AnimationNeedsResample();
}
return NS_OK;
}
void
nsSVGViewBox::GetBaseValueString(nsAString& aValue) const
{
if (mBaseVal.none) {
aValue.AssignLiteral("none");
return;
}
char16_t buf[200];
nsTextFormatter::snprintf(buf, sizeof(buf)/sizeof(char16_t),
MOZ_UTF16("%g %g %g %g"),
(double)mBaseVal.x, (double)mBaseVal.y,
(double)mBaseVal.width, (double)mBaseVal.height);
aValue.Assign(buf);
}
already_AddRefed<dom::SVGAnimatedRect>
nsSVGViewBox::ToSVGAnimatedRect(nsSVGElement* aSVGElement)
{
RefPtr<dom::SVGAnimatedRect> domAnimatedRect =
sSVGAnimatedRectTearoffTable.GetTearoff(this);
if (!domAnimatedRect) {
domAnimatedRect = new dom::SVGAnimatedRect(this, aSVGElement);
sSVGAnimatedRectTearoffTable.AddTearoff(this, domAnimatedRect);
}
return domAnimatedRect.forget();
}
already_AddRefed<dom::SVGIRect>
nsSVGViewBox::ToDOMBaseVal(nsSVGElement *aSVGElement)
{
if (!mHasBaseVal || mBaseVal.none) {
return nullptr;
}
RefPtr<DOMBaseVal> domBaseVal =
sBaseSVGViewBoxTearoffTable.GetTearoff(this);
if (!domBaseVal) {
domBaseVal = new DOMBaseVal(this, aSVGElement);
sBaseSVGViewBoxTearoffTable.AddTearoff(this, domBaseVal);
}
return domBaseVal.forget();
}
nsSVGViewBox::DOMBaseVal::~DOMBaseVal()
{
sBaseSVGViewBoxTearoffTable.RemoveTearoff(mVal);
}
already_AddRefed<dom::SVGIRect>
nsSVGViewBox::ToDOMAnimVal(nsSVGElement *aSVGElement)
{
if ((mAnimVal && mAnimVal->none) ||
(!mAnimVal && (!mHasBaseVal || mBaseVal.none))) {
return nullptr;
}
RefPtr<DOMAnimVal> domAnimVal =
sAnimSVGViewBoxTearoffTable.GetTearoff(this);
if (!domAnimVal) {
domAnimVal = new DOMAnimVal(this, aSVGElement);
sAnimSVGViewBoxTearoffTable.AddTearoff(this, domAnimVal);
}
return domAnimVal.forget();
}
nsSVGViewBox::DOMAnimVal::~DOMAnimVal()
{
sAnimSVGViewBoxTearoffTable.RemoveTearoff(mVal);
}
void
nsSVGViewBox::DOMBaseVal::SetX(float aX, ErrorResult& aRv)
{
nsSVGViewBoxRect rect = mVal->GetBaseValue();
rect.x = aX;
mVal->SetBaseValue(rect, mSVGElement);
}
void
nsSVGViewBox::DOMBaseVal::SetY(float aY, ErrorResult& aRv)
{
nsSVGViewBoxRect rect = mVal->GetBaseValue();
rect.y = aY;
mVal->SetBaseValue(rect, mSVGElement);
}
void
nsSVGViewBox::DOMBaseVal::SetWidth(float aWidth, ErrorResult& aRv)
{
nsSVGViewBoxRect rect = mVal->GetBaseValue();
rect.width = aWidth;
mVal->SetBaseValue(rect, mSVGElement);
}
void
nsSVGViewBox::DOMBaseVal::SetHeight(float aHeight, ErrorResult& aRv)
{
nsSVGViewBoxRect rect = mVal->GetBaseValue();
rect.height = aHeight;
mVal->SetBaseValue(rect, mSVGElement);
}
nsISMILAttr*
nsSVGViewBox::ToSMILAttr(nsSVGElement *aSVGElement)
{
return new SMILViewBox(this, aSVGElement);
}
nsresult
nsSVGViewBox::SMILViewBox
::ValueFromString(const nsAString& aStr,
const dom::SVGAnimationElement* /*aSrcElement*/,
nsSMILValue& aValue,
bool& aPreventCachingOfSandwich) const
{
nsSVGViewBoxRect viewBox;
nsresult res = ToSVGViewBoxRect(aStr, &viewBox);
if (NS_FAILED(res)) {
return res;
}
nsSMILValue val(&SVGViewBoxSMILType::sSingleton);
*static_cast<nsSVGViewBoxRect*>(val.mU.mPtr) = viewBox;
aValue = Move(val);
aPreventCachingOfSandwich = false;
return NS_OK;
}
nsSMILValue
nsSVGViewBox::SMILViewBox::GetBaseValue() const
{
nsSMILValue val(&SVGViewBoxSMILType::sSingleton);
*static_cast<nsSVGViewBoxRect*>(val.mU.mPtr) = mVal->mBaseVal;
return val;
}
void
nsSVGViewBox::SMILViewBox::ClearAnimValue()
{
if (mVal->mAnimVal) {
mVal->mAnimVal = nullptr;
mSVGElement->DidAnimateViewBox();
}
}
nsresult
nsSVGViewBox::SMILViewBox::SetAnimValue(const nsSMILValue& aValue)
{
NS_ASSERTION(aValue.mType == &SVGViewBoxSMILType::sSingleton,
"Unexpected type to assign animated value");
if (aValue.mType == &SVGViewBoxSMILType::sSingleton) {
nsSVGViewBoxRect &vb = *static_cast<nsSVGViewBoxRect*>(aValue.mU.mPtr);
mVal->SetAnimValue(vb, mSVGElement);
}
return NS_OK;
}