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gecko-dev/dom/svg/SVGViewportElement.cpp

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/* -*- 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 <stdint.h>
#include "mozilla/ArrayUtils.h"
#include "mozilla/ContentEvents.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/Likely.h"
#include "mozilla/dom/SVGLengthBinding.h"
#include "mozilla/dom/SVGMatrix.h"
#include "mozilla/dom/SVGViewportElement.h"
#include "mozilla/dom/SVGViewElement.h"
#include "DOMSVGLength.h"
#include "DOMSVGPoint.h"
#include "nsCOMPtr.h"
#include "nsContentUtils.h"
#include "nsFrameSelection.h"
#include "nsError.h"
#include "nsGkAtoms.h"
#include "nsIDocument.h"
#include "nsIFrame.h"
#include "nsIPresShell.h"
#include "nsISVGSVGFrame.h" //XXX
#include "nsLayoutUtils.h"
#include "nsStyleUtil.h"
#include "nsSMILTypes.h"
#include "SVGContentUtils.h"
#include <algorithm>
#include "prtime.h"
using namespace mozilla::gfx;
namespace mozilla {
namespace dom {
nsSVGElement::LengthInfo SVGViewportElement::sLengthInfo[4] =
{
{ &nsGkAtoms::x, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
{ &nsGkAtoms::y, 0, SVGLength_Binding::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },
{ &nsGkAtoms::width, 100, SVGLength_Binding::SVG_LENGTHTYPE_PERCENTAGE, SVGContentUtils::X },
{ &nsGkAtoms::height, 100, SVGLength_Binding::SVG_LENGTHTYPE_PERCENTAGE, SVGContentUtils::Y },
};
//----------------------------------------------------------------------
// Implementation
SVGViewportElement::SVGViewportElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: SVGGraphicsElement(aNodeInfo),
mViewportWidth(0),
mViewportHeight(0),
mHasChildrenOnlyTransform(false)
{
}
SVGViewportElement::~SVGViewportElement()
{
}
//----------------------------------------------------------------------
already_AddRefed<SVGAnimatedRect>
SVGViewportElement::ViewBox()
{
return mViewBox.ToSVGAnimatedRect(this);
}
already_AddRefed<DOMSVGAnimatedPreserveAspectRatio>
SVGViewportElement::PreserveAspectRatio()
{
return mPreserveAspectRatio.ToDOMAnimatedPreserveAspectRatio(this);
}
//----------------------------------------------------------------------
// nsIContent methods
NS_IMETHODIMP_(bool)
SVGViewportElement::IsAttributeMapped(const nsAtom* name) const
{
// We want to map the 'width' and 'height' attributes into style for
// outer-<svg>, except when the attributes aren't set (since their default
// values of '100%' can cause unexpected and undesirable behaviour for SVG
// inline in HTML). We rely on nsSVGElement::UpdateContentStyleRule() to
// prevent mapping of the default values into style (it only maps attributes
// that are set). We also rely on a check in nsSVGElement::
// UpdateContentStyleRule() to prevent us mapping the attributes when they're
// given a <length> value that is not currently recognized by the SVG
// specification.
if (!IsInner() && (name == nsGkAtoms::width || name == nsGkAtoms::height)) {
return true;
}
static const MappedAttributeEntry* const map[] = {
sColorMap,
sFEFloodMap,
sFillStrokeMap,
sFiltersMap,
sFontSpecificationMap,
sGradientStopMap,
sGraphicsMap,
sLightingEffectsMap,
sMarkersMap,
sTextContentElementsMap,
sViewportsMap
};
return FindAttributeDependence(name, map) ||
SVGGraphicsElement::IsAttributeMapped(name);
}
//----------------------------------------------------------------------
// nsSVGElement overrides
// Helper for GetViewBoxTransform on root <svg> node
// * aLength: internal value for our <svg> width or height attribute.
// * aViewportLength: length of the corresponding dimension of the viewport.
// * aSelf: the outermost <svg> node itself.
// NOTE: aSelf is not an ancestor viewport element, so it can't be used to
// resolve percentage lengths. (It can only be used to resolve
// 'em'/'ex'-valued units).
inline float
ComputeSynthesizedViewBoxDimension(const nsSVGLength2& aLength,
float aViewportLength,
const SVGViewportElement* aSelf)
{
if (aLength.IsPercentage()) {
return aViewportLength * aLength.GetAnimValInSpecifiedUnits() / 100.0f;
}
return aLength.GetAnimValue(const_cast<SVGViewportElement*>(aSelf));
}
//----------------------------------------------------------------------
// public helpers:
void
SVGViewportElement::UpdateHasChildrenOnlyTransform()
{
bool hasChildrenOnlyTransform =
HasViewBoxOrSyntheticViewBox() ||
(IsRoot() && (GetCurrentTranslate() != SVGPoint(0.0f, 0.0f) ||
GetCurrentScale() != 1.0f));
mHasChildrenOnlyTransform = hasChildrenOnlyTransform;
}
void
SVGViewportElement::ChildrenOnlyTransformChanged(uint32_t aFlags)
{
// Avoid wasteful calls:
MOZ_ASSERT(!(GetPrimaryFrame()->GetStateBits() & NS_FRAME_IS_NONDISPLAY),
"Non-display SVG frames don't maintain overflow rects");
nsChangeHint changeHint;
bool hadChildrenOnlyTransform = mHasChildrenOnlyTransform;
UpdateHasChildrenOnlyTransform();
if (hadChildrenOnlyTransform != mHasChildrenOnlyTransform) {
// Reconstruct the frame tree to handle stacking context changes:
// XXXjwatt don't do this for root-<svg> or even outer-<svg>?
changeHint = nsChangeHint_ReconstructFrame;
} else {
// We just assume the old and new transforms are different.
changeHint = nsChangeHint(nsChangeHint_UpdateOverflow |
nsChangeHint_ChildrenOnlyTransform);
}
// If we're not reconstructing the frame tree, then we only call
// PostRestyleEvent if we're not being called under reflow to avoid recursing
// to death. See bug 767056 comments 10 and 12. Since our nsSVGOuterSVGFrame
// is being reflowed we're going to invalidate and repaint its entire area
// anyway (which will include our children).
if ((changeHint & nsChangeHint_ReconstructFrame) ||
!(aFlags & eDuringReflow)) {
nsLayoutUtils::PostRestyleEvent(this, nsRestyleHint(0), changeHint);
}
}
gfx::Matrix
SVGViewportElement::GetViewBoxTransform() const
{
float viewportWidth, viewportHeight;
if (IsInner()) {
SVGViewportElement *ctx = GetCtx();
viewportWidth = mLengthAttributes[ATTR_WIDTH].GetAnimValue(ctx);
viewportHeight = mLengthAttributes[ATTR_HEIGHT].GetAnimValue(ctx);
} else {
viewportWidth = mViewportWidth;
viewportHeight = mViewportHeight;
}
if (viewportWidth <= 0.0f || viewportHeight <= 0.0f) {
return gfx::Matrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
}
nsSVGViewBoxRect viewBox =
GetViewBoxWithSynthesis(viewportWidth, viewportHeight);
if (viewBox.width <= 0.0f || viewBox.height <= 0.0f) {
return gfx::Matrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
}
return SVGContentUtils::GetViewBoxTransform(viewportWidth, viewportHeight,
viewBox.x, viewBox.y,
viewBox.width, viewBox.height,
GetPreserveAspectRatioWithOverride());
}
//----------------------------------------------------------------------
// SVGViewportElement
float
SVGViewportElement::GetLength(uint8_t aCtxType)
{
const nsSVGViewBoxRect* viewbox =
GetViewBoxInternal().HasRect() ? &GetViewBoxInternal().GetAnimValue()
: nullptr;
float h, w;
if (viewbox) {
w = viewbox->width;
h = viewbox->height;
} else if (IsInner()) {
SVGViewportElement *ctx = GetCtx();
w = mLengthAttributes[ATTR_WIDTH].GetAnimValue(ctx);
h = mLengthAttributes[ATTR_HEIGHT].GetAnimValue(ctx);
} else if (ShouldSynthesizeViewBox()) {
w = ComputeSynthesizedViewBoxDimension(mLengthAttributes[ATTR_WIDTH],
mViewportWidth, this);
h = ComputeSynthesizedViewBoxDimension(mLengthAttributes[ATTR_HEIGHT],
mViewportHeight, this);
} else {
w = mViewportWidth;
h = mViewportHeight;
}
w = std::max(w, 0.0f);
h = std::max(h, 0.0f);
switch (aCtxType) {
case SVGContentUtils::X:
return w;
case SVGContentUtils::Y:
return h;
case SVGContentUtils::XY:
return float(SVGContentUtils::ComputeNormalizedHypotenuse(w, h));
}
return 0;
}
//----------------------------------------------------------------------
// nsSVGElement methods
/* virtual */ gfxMatrix
SVGViewportElement::PrependLocalTransformsTo(const gfxMatrix& aMatrix,
SVGTransformTypes aWhich) const
{
// 'transform' attribute (or an override from a fragment identifier):
gfxMatrix userToParent;
if (aWhich == eUserSpaceToParent || aWhich == eAllTransforms) {
userToParent = GetUserToParentTransform(mAnimateMotionTransform,
GetTransformInternal());
if (aWhich == eUserSpaceToParent) {
return userToParent * aMatrix;
}
}
gfxMatrix childToUser;
if (IsInner()) {
float x, y;
const_cast<SVGViewportElement*>(this)->GetAnimatedLengthValues(&x, &y, nullptr);
childToUser = ThebesMatrix(GetViewBoxTransform().PostTranslate(x, y));
} else if (IsRoot()) {
SVGPoint translate = GetCurrentTranslate();
float scale = GetCurrentScale();
childToUser = ThebesMatrix(GetViewBoxTransform()
.PostScale(scale, scale)
.PostTranslate(translate.GetX(),
translate.GetY()));
} else {
// outer-<svg>, but inline in some other content:
childToUser = ThebesMatrix(GetViewBoxTransform());
}
if (aWhich == eAllTransforms) {
return childToUser * userToParent * aMatrix;
}
MOZ_ASSERT(aWhich == eChildToUserSpace, "Unknown TransformTypes");
// The following may look broken because pre-multiplying our eChildToUserSpace
// transform with another matrix without including our eUserSpaceToParent
// transform between the two wouldn't make sense. We don't expect that to
// ever happen though. We get here either when the identity matrix has been
// passed because our caller just wants our eChildToUserSpace transform, or
// when our eUserSpaceToParent transform has already been multiplied into the
// matrix that our caller passes (such as when we're called from PaintSVG).
return childToUser * aMatrix;
}
/* virtual */ bool
SVGViewportElement::HasValidDimensions() const
{
return !IsInner() ||
((!mLengthAttributes[ATTR_WIDTH].IsExplicitlySet() ||
mLengthAttributes[ATTR_WIDTH].GetAnimValInSpecifiedUnits() > 0) &&
(!mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet() ||
mLengthAttributes[ATTR_HEIGHT].GetAnimValInSpecifiedUnits() > 0));
}
nsSVGViewBox*
SVGViewportElement::GetViewBox()
{
return &mViewBox;
}
SVGAnimatedPreserveAspectRatio *
SVGViewportElement::GetPreserveAspectRatio()
{
return &mPreserveAspectRatio;
}
bool
SVGViewportElement::ShouldSynthesizeViewBox() const
{
MOZ_ASSERT(!HasViewBoxRect(), "Should only be called if we lack a viewBox");
return IsRoot() && OwnerDoc()->IsBeingUsedAsImage();
}
//----------------------------------------------------------------------
// implementation helpers
nsSVGViewBoxRect
SVGViewportElement::GetViewBoxWithSynthesis(
float aViewportWidth, float aViewportHeight) const
{
if (GetViewBoxInternal().HasRect()) {
return GetViewBoxInternal().GetAnimValue();
}
if (ShouldSynthesizeViewBox()) {
// Special case -- fake a viewBox, using height & width attrs.
// (Use |this| as context, since if we get here, we're outermost <svg>.)
return nsSVGViewBoxRect(0, 0,
ComputeSynthesizedViewBoxDimension(mLengthAttributes[ATTR_WIDTH],
mViewportWidth, this),
ComputeSynthesizedViewBoxDimension(mLengthAttributes[ATTR_HEIGHT],
mViewportHeight, this));
}
// No viewBox attribute, so we shouldn't auto-scale. This is equivalent
// to having a viewBox that exactly matches our viewport size.
return nsSVGViewBoxRect(0, 0, aViewportWidth, aViewportHeight);
}
nsSVGElement::LengthAttributesInfo
SVGViewportElement::GetLengthInfo()
{
return LengthAttributesInfo(mLengthAttributes, sLengthInfo,
ArrayLength(sLengthInfo));
}
} // namespace dom
} // namespace mozilla
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