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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
#include "GeometryUtils.h"
#include "mozilla/PresShell.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/dom/CharacterData.h"
#include "mozilla/dom/DOMPointBinding.h"
#include "mozilla/dom/GeometryUtilsBinding.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Text.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/DOMPoint.h"
#include "mozilla/dom/DOMQuad.h"
#include "mozilla/dom/DOMRect.h"
#include "mozilla/dom/BrowserChild.h"
#include "nsIFrame.h"
#include "nsContainerFrame.h"
#include "nsContentUtils.h"
#include "nsCSSFrameConstructor.h"
#include "nsLayoutUtils.h"
using namespace mozilla;
using namespace mozilla::dom;
namespace mozilla {
enum GeometryNodeType {
GEOMETRY_NODE_ELEMENT,
GEOMETRY_NODE_TEXT,
GEOMETRY_NODE_DOCUMENT
};
static nsIFrame* GetFrameForNode(nsINode* aNode, GeometryNodeType aType,
bool aCreateFramesForSuppressedWhitespace) {
Document* doc = aNode->OwnerDoc();
if (aType == GEOMETRY_NODE_TEXT && aCreateFramesForSuppressedWhitespace) {
if (PresShell* presShell = doc->GetPresShell()) {
presShell->FrameConstructor()->EnsureFrameForTextNodeIsCreatedAfterFlush(
static_cast<CharacterData*>(aNode));
}
}
doc->FlushPendingNotifications(FlushType::Layout);
switch (aType) {
case GEOMETRY_NODE_TEXT:
case GEOMETRY_NODE_ELEMENT:
return aNode->AsContent()->GetPrimaryFrame();
case GEOMETRY_NODE_DOCUMENT: {
PresShell* presShell = doc->GetPresShell();
return presShell ? presShell->GetRootFrame() : nullptr;
}
default:
MOZ_ASSERT(false, "Unknown GeometryNodeType");
return nullptr;
}
}
static nsIFrame* GetFrameForGeometryNode(
const Optional<OwningGeometryNode>& aGeometryNode, nsINode* aDefaultNode,
bool aCreateFramesForSuppressedWhitespace) {
if (!aGeometryNode.WasPassed()) {
return GetFrameForNode(aDefaultNode->OwnerDoc(), GEOMETRY_NODE_DOCUMENT,
aCreateFramesForSuppressedWhitespace);
}
const OwningGeometryNode& value = aGeometryNode.Value();
if (value.IsElement()) {
return GetFrameForNode(value.GetAsElement(), GEOMETRY_NODE_ELEMENT,
aCreateFramesForSuppressedWhitespace);
}
if (value.IsDocument()) {
return GetFrameForNode(value.GetAsDocument(), GEOMETRY_NODE_DOCUMENT,
aCreateFramesForSuppressedWhitespace);
}
return GetFrameForNode(value.GetAsText(), GEOMETRY_NODE_TEXT,
aCreateFramesForSuppressedWhitespace);
}
static nsIFrame* GetFrameForGeometryNode(const GeometryNode& aGeometryNode) {
// This will create frames for suppressed whitespace nodes.
if (aGeometryNode.IsElement()) {
return GetFrameForNode(&aGeometryNode.GetAsElement(), GEOMETRY_NODE_ELEMENT,
true);
}
if (aGeometryNode.IsDocument()) {
return GetFrameForNode(&aGeometryNode.GetAsDocument(),
GEOMETRY_NODE_DOCUMENT, true);
}
return GetFrameForNode(&aGeometryNode.GetAsText(), GEOMETRY_NODE_TEXT, true);
}
static nsIFrame* GetFrameForNode(nsINode* aNode,
bool aCreateFramesForSuppressedWhitespace) {
if (aNode->IsElement()) {
return GetFrameForNode(aNode, GEOMETRY_NODE_ELEMENT,
aCreateFramesForSuppressedWhitespace);
}
if (aNode == aNode->OwnerDoc()) {
return GetFrameForNode(aNode, GEOMETRY_NODE_DOCUMENT,
aCreateFramesForSuppressedWhitespace);
}
NS_ASSERTION(aNode->IsText(), "Unknown node type");
return GetFrameForNode(aNode, GEOMETRY_NODE_TEXT,
aCreateFramesForSuppressedWhitespace);
}
static nsIFrame* GetFirstNonAnonymousFrameForGeometryNode(
const Optional<OwningGeometryNode>& aNode, nsINode* aDefaultNode,
bool aCreateFramesForSuppressedWhitespace) {
nsIFrame* f = GetFrameForGeometryNode(aNode, aDefaultNode,
aCreateFramesForSuppressedWhitespace);
if (f) {
f = nsLayoutUtils::GetFirstNonAnonymousFrame(f);
}
return f;
}
static nsIFrame* GetFirstNonAnonymousFrameForGeometryNode(
const GeometryNode& aNode) {
// This will create frames for suppressed whitespace nodes.
nsIFrame* f = GetFrameForGeometryNode(aNode);
if (f) {
f = nsLayoutUtils::GetFirstNonAnonymousFrame(f);
}
return f;
}
static nsIFrame* GetFirstNonAnonymousFrameForNode(nsINode* aNode) {
// This will create frames for suppressed whitespace nodes.
nsIFrame* f = GetFrameForNode(aNode, true);
if (f) {
f = nsLayoutUtils::GetFirstNonAnonymousFrame(f);
}
return f;
}
/**
* This can modify aFrame to point to a different frame. This is needed to
* handle SVG, where SVG elements can only compute a rect that's valid with
* respect to the "outer SVG" frame.
*/
static nsRect GetBoxRectForFrame(nsIFrame** aFrame, CSSBoxType aType) {
nsRect r;
nsIFrame* f = SVGUtils::GetOuterSVGFrameAndCoveredRegion(*aFrame, &r);
if (f && f != *aFrame) {
// For non-outer SVG frames, the BoxType is ignored.
*aFrame = f;
return r;
}
f = *aFrame;
switch (aType) {
case CSSBoxType::Content:
r = f->GetContentRectRelativeToSelf();
break;
case CSSBoxType::Padding:
r = f->GetPaddingRectRelativeToSelf();
break;
case CSSBoxType::Border:
r = nsRect(nsPoint(0, 0), f->GetSize());
break;
case CSSBoxType::Margin:
r = f->GetMarginRectRelativeToSelf();
break;
default:
MOZ_ASSERT(false, "unknown box type");
return r;
}
return r;
}
class AccumulateQuadCallback : public nsLayoutUtils::BoxCallback {
public:
AccumulateQuadCallback(Document* aParentObject,
nsTArray<RefPtr<DOMQuad> >& aResult,
nsIFrame* aRelativeToFrame,
const nsPoint& aRelativeToBoxTopLeft,
CSSBoxType aBoxType)
: mParentObject(ToSupports(aParentObject)),
mResult(aResult),
mRelativeToFrame(aRelativeToFrame),
mRelativeToBoxTopLeft(aRelativeToBoxTopLeft),
mBoxType(aBoxType) {
if (mBoxType == CSSBoxType::Margin) {
// Don't include the caption margin when computing margins for a
// table
mIncludeCaptionBoxForTable = false;
}
}
void AddBox(nsIFrame* aFrame) override {
nsIFrame* f = aFrame;
if (mBoxType == CSSBoxType::Margin && f->IsTableFrame()) {
// Margin boxes for table frames should be taken from the table wrapper
// frame, since that has the margin.
f = f->GetParent();
}
nsRect box = GetBoxRectForFrame(&f, mBoxType);
nsPoint appUnits[4] = {box.TopLeft(), box.TopRight(), box.BottomRight(),
box.BottomLeft()};
CSSPoint points[4];
for (uint32_t i = 0; i < 4; ++i) {
points[i] =
CSSPoint(nsPresContext::AppUnitsToFloatCSSPixels(appUnits[i].x),
nsPresContext::AppUnitsToFloatCSSPixels(appUnits[i].y));
}
nsLayoutUtils::TransformResult rv = nsLayoutUtils::TransformPoints(
RelativeTo{f}, RelativeTo{mRelativeToFrame}, 4, points);
if (rv == nsLayoutUtils::TRANSFORM_SUCCEEDED) {
CSSPoint delta(
nsPresContext::AppUnitsToFloatCSSPixels(mRelativeToBoxTopLeft.x),
nsPresContext::AppUnitsToFloatCSSPixels(mRelativeToBoxTopLeft.y));
for (uint32_t i = 0; i < 4; ++i) {
points[i] -= delta;
}
} else {
PodArrayZero(points);
}
mResult.AppendElement(new DOMQuad(mParentObject, points));
}
nsISupports* mParentObject;
nsTArray<RefPtr<DOMQuad> >& mResult;
nsIFrame* mRelativeToFrame;
nsPoint mRelativeToBoxTopLeft;
CSSBoxType mBoxType;
};
static nsPresContext* FindTopLevelPresContext(nsPresContext* aPC) {
bool isChrome = aPC->IsChrome();
nsPresContext* pc = aPC;
for (;;) {
nsPresContext* parent = pc->GetParentPresContext();
if (!parent || parent->IsChrome() != isChrome) {
return pc;
}
pc = parent;
}
}
static bool CheckFramesInSameTopLevelBrowsingContext(nsIFrame* aFrame1,
nsIFrame* aFrame2,
CallerType aCallerType) {
nsPresContext* pc1 = aFrame1->PresContext();
nsPresContext* pc2 = aFrame2->PresContext();
if (pc1 == pc2) {
return true;
}
if (aCallerType == CallerType::System) {
return true;
}
if (FindTopLevelPresContext(pc1) == FindTopLevelPresContext(pc2)) {
return true;
}
return false;
}
void GetBoxQuads(nsINode* aNode, const dom::BoxQuadOptions& aOptions,
nsTArray<RefPtr<DOMQuad> >& aResult, CallerType aCallerType,
ErrorResult& aRv) {
nsIFrame* frame =
GetFrameForNode(aNode, aOptions.mCreateFramesForSuppressedWhitespace);
if (!frame) {
// No boxes to return
return;
}
AutoWeakFrame weakFrame(frame);
Document* ownerDoc = aNode->OwnerDoc();
nsIFrame* relativeToFrame = GetFirstNonAnonymousFrameForGeometryNode(
aOptions.mRelativeTo, ownerDoc,
aOptions.mCreateFramesForSuppressedWhitespace);
// The first frame might be destroyed now if the above call lead to an
// EnsureFrameForTextNode call. We need to get the first frame again
// when that happens and re-check it.
if (!weakFrame.IsAlive()) {
frame =
GetFrameForNode(aNode, aOptions.mCreateFramesForSuppressedWhitespace);
if (!frame) {
// No boxes to return
return;
}
}
if (!relativeToFrame) {
// XXXbz There's no spec for this.
return aRv.ThrowNotFoundError("No box to get quads relative to");
}
if (!CheckFramesInSameTopLevelBrowsingContext(frame, relativeToFrame,
aCallerType)) {
aRv.ThrowNotFoundError(
"Can't get quads relative to a box in a different toplevel browsing "
"context");
return;
}
// GetBoxRectForFrame can modify relativeToFrame so call it first.
nsPoint relativeToTopLeft =
GetBoxRectForFrame(&relativeToFrame, CSSBoxType::Border).TopLeft();
AccumulateQuadCallback callback(ownerDoc, aResult, relativeToFrame,
relativeToTopLeft, aOptions.mBox);
// then convert into CSS units.
nsLayoutUtils::GetAllInFlowBoxes(frame, &callback);
}
void GetBoxQuadsFromWindowOrigin(nsINode* aNode,
const dom::BoxQuadOptions& aOptions,
nsTArray<RefPtr<DOMQuad> >& aResult,
ErrorResult& aRv) {
// We want the quads relative to the window. To do this, we ignore the
// provided aOptions.mRelativeTo and instead use the document node of
// the top-most in-process document. Later, we'll check if there is a
// browserChild associated with that document, and if so, transform the
// calculated quads with the browserChild's to-parent matrix, which
// will get us to top-level coordinates.
if (aOptions.mRelativeTo.WasPassed()) {
return aRv.ThrowNotSupportedError(
"Can't request quads in window origin space relative to another "
"node.");
}
// We're going to call GetBoxQuads with our parameters, but we supply
// a new BoxQuadOptions object that uses the top in-process document
// as the relativeTo target.
BoxQuadOptions bqo(aOptions);
RefPtr<Document> topInProcessDoc =
nsContentUtils::GetInProcessSubtreeRootDocument(aNode->OwnerDoc());
OwningGeometryNode ogn;
ogn.SetAsDocument() = topInProcessDoc;
bqo.mRelativeTo.Construct(ogn);
// transform directly with the GetChildToParentConversionMatrix below,
// and convert to CSS units as a final step.
GetBoxQuads(aNode, bqo, aResult, CallerType::System, aRv);
if (aRv.Failed()) {
return;
}
// Now we have aResult filled with DOMQuads with values relative to the
// top in-process document. See if topInProcessDoc is associated with a
// BrowserChild, and if it is, get its transformation matrix and use that
// to transform the DOMQuads in place to make them relative to the window
// origin.
nsIDocShell* docShell = topInProcessDoc->GetDocShell();
if (!docShell) {
return aRv.ThrowInvalidStateError(
"Returning untranslated quads because top in process document has "
"no docshell.");
}
BrowserChild* browserChild = BrowserChild::GetFrom(docShell);
if (!browserChild) {
return;
}
nsPresContext* presContext = docShell->GetPresContext();
if (!presContext) {
return;
}
int32_t appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel();
LayoutDeviceToLayoutDeviceMatrix4x4 matrix =
browserChild->GetChildToParentConversionMatrix();
// For each DOMQuad in aResult, change the css units into layer pixels,
// then transform them by matrix, then change them back into css units
// and overwrite the original points.
LayoutDeviceToCSSScale ld2cScale((float)appUnitsPerDevPixel /
(float)AppUnitsPerCSSPixel());
CSSToLayoutDeviceScale c2ldScale = ld2cScale.Inverse();
for (auto& quad : aResult) {
for (uint32_t i = 0; i < 4; i++) {
DOMPoint* p = quad->Point(i);
CSSPoint cp(p->X(), p->Y());
LayoutDevicePoint windowLdp = matrix.TransformPoint(cp * c2ldScale);
CSSPoint windowCp = windowLdp * ld2cScale;
p->SetX(windowCp.x);
p->SetY(windowCp.y);
}
}
}
static void TransformPoints(nsINode* aTo, const GeometryNode& aFrom,
uint32_t aPointCount, CSSPoint* aPoints,
const ConvertCoordinateOptions& aOptions,
CallerType aCallerType, ErrorResult& aRv) {
nsIFrame* fromFrame = GetFirstNonAnonymousFrameForGeometryNode(aFrom);
AutoWeakFrame weakFrame(fromFrame);
nsIFrame* toFrame = GetFirstNonAnonymousFrameForNode(aTo);
// The first frame might be destroyed now if the above call lead to an
// EnsureFrameForTextNode call. We need to get the first frame again
// when that happens.
if (fromFrame && !weakFrame.IsAlive()) {
fromFrame = GetFirstNonAnonymousFrameForGeometryNode(aFrom);
}
if (!fromFrame || !toFrame) {
aRv.ThrowNotFoundError(
"Can't transform coordinates between nonexistent boxes");
return;
}
if (!CheckFramesInSameTopLevelBrowsingContext(fromFrame, toFrame,
aCallerType)) {
aRv.ThrowNotFoundError(
"Can't transform coordinates between boxes in different toplevel "
"browsing contexts");
return;
}
nsPoint fromOffset =
GetBoxRectForFrame(&fromFrame, aOptions.mFromBox).TopLeft();
nsPoint toOffset = GetBoxRectForFrame(&toFrame, aOptions.mToBox).TopLeft();
CSSPoint fromOffsetGfx(nsPresContext::AppUnitsToFloatCSSPixels(fromOffset.x),
nsPresContext::AppUnitsToFloatCSSPixels(fromOffset.y));
for (uint32_t i = 0; i < aPointCount; ++i) {
aPoints[i] += fromOffsetGfx;
}
nsLayoutUtils::TransformResult rv = nsLayoutUtils::TransformPoints(
RelativeTo{fromFrame}, RelativeTo{toFrame}, aPointCount, aPoints);
if (rv == nsLayoutUtils::TRANSFORM_SUCCEEDED) {
CSSPoint toOffsetGfx(nsPresContext::AppUnitsToFloatCSSPixels(toOffset.x),
nsPresContext::AppUnitsToFloatCSSPixels(toOffset.y));
for (uint32_t i = 0; i < aPointCount; ++i) {
aPoints[i] -= toOffsetGfx;
}
} else {
PodZero(aPoints, aPointCount);
}
}
already_AddRefed<DOMQuad> ConvertQuadFromNode(
nsINode* aTo, dom::DOMQuad& aQuad, const GeometryNode& aFrom,
const dom::ConvertCoordinateOptions& aOptions, CallerType aCallerType,
ErrorResult& aRv) {
CSSPoint points[4];
for (uint32_t i = 0; i < 4; ++i) {
DOMPoint* p = aQuad.Point(i);
if (p->W() != 1.0 || p->Z() != 0.0) {
aRv.ThrowInvalidStateError("Point is not 2d");
return nullptr;
}
points[i] = CSSPoint(p->X(), p->Y());
}
TransformPoints(aTo, aFrom, 4, points, aOptions, aCallerType, aRv);
if (aRv.Failed()) {
return nullptr;
}
RefPtr<DOMQuad> result = new DOMQuad(aTo->GetParentObject().mObject, points);
return result.forget();
}
already_AddRefed<DOMQuad> ConvertRectFromNode(
nsINode* aTo, dom::DOMRectReadOnly& aRect, const GeometryNode& aFrom,
const dom::ConvertCoordinateOptions& aOptions, CallerType aCallerType,
ErrorResult& aRv) {
CSSPoint points[4];
double x = aRect.X(), y = aRect.Y(), w = aRect.Width(), h = aRect.Height();
points[0] = CSSPoint(x, y);
points[1] = CSSPoint(x + w, y);
points[2] = CSSPoint(x + w, y + h);
points[3] = CSSPoint(x, y + h);
TransformPoints(aTo, aFrom, 4, points, aOptions, aCallerType, aRv);
if (aRv.Failed()) {
return nullptr;
}
RefPtr<DOMQuad> result = new DOMQuad(aTo->GetParentObject().mObject, points);
return result.forget();
}
already_AddRefed<DOMPoint> ConvertPointFromNode(
nsINode* aTo, const dom::DOMPointInit& aPoint, const GeometryNode& aFrom,
const dom::ConvertCoordinateOptions& aOptions, CallerType aCallerType,
ErrorResult& aRv) {
if (aPoint.mW != 1.0 || aPoint.mZ != 0.0) {
aRv.ThrowInvalidStateError("Point is not 2d");
return nullptr;
}
CSSPoint point(aPoint.mX, aPoint.mY);
TransformPoints(aTo, aFrom, 1, &point, aOptions, aCallerType, aRv);
if (aRv.Failed()) {
return nullptr;
}
RefPtr<DOMPoint> result =
new DOMPoint(aTo->GetParentObject().mObject, point.x, point.y);
return result.forget();
}
} // namespace mozilla