forked from mirrors/gecko-dev
6a3833ac40
Differential Revision: https://phabricator.services.mozilla.com/D45118 --HG-- extra : moz-landing-system : lando
403 lines
14 KiB
C++
403 lines
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 "GeometryUtils.h"
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#include "mozilla/PresShell.h"
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#include "mozilla/dom/CharacterData.h"
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#include "mozilla/dom/DOMPointBinding.h"
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#include "mozilla/dom/GeometryUtilsBinding.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/dom/Text.h"
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#include "mozilla/dom/DOMPoint.h"
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#include "mozilla/dom/DOMQuad.h"
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#include "mozilla/dom/DOMRect.h"
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#include "nsIFrame.h"
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#include "nsCSSFrameConstructor.h"
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#include "nsLayoutUtils.h"
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#include "nsSVGUtils.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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namespace mozilla {
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enum GeometryNodeType {
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GEOMETRY_NODE_ELEMENT,
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GEOMETRY_NODE_TEXT,
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GEOMETRY_NODE_DOCUMENT
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};
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static nsIFrame* GetFrameForNode(nsINode* aNode, GeometryNodeType aType,
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bool aCreateFramesForSuppressedWhitespace) {
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Document* doc = aNode->OwnerDoc();
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if (aType == GEOMETRY_NODE_TEXT && aCreateFramesForSuppressedWhitespace) {
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if (PresShell* presShell = doc->GetPresShell()) {
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presShell->FrameConstructor()->EnsureFrameForTextNodeIsCreatedAfterFlush(
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static_cast<CharacterData*>(aNode));
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}
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}
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doc->FlushPendingNotifications(FlushType::Layout);
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switch (aType) {
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case GEOMETRY_NODE_TEXT:
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case GEOMETRY_NODE_ELEMENT:
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return aNode->AsContent()->GetPrimaryFrame();
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case GEOMETRY_NODE_DOCUMENT: {
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PresShell* presShell = doc->GetPresShell();
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return presShell ? presShell->GetRootFrame() : nullptr;
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}
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default:
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MOZ_ASSERT(false, "Unknown GeometryNodeType");
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return nullptr;
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}
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}
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static nsIFrame* GetFrameForGeometryNode(
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const Optional<OwningGeometryNode>& aGeometryNode, nsINode* aDefaultNode,
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bool aCreateFramesForSuppressedWhitespace) {
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if (!aGeometryNode.WasPassed()) {
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return GetFrameForNode(aDefaultNode->OwnerDoc(), GEOMETRY_NODE_DOCUMENT,
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aCreateFramesForSuppressedWhitespace);
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}
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const OwningGeometryNode& value = aGeometryNode.Value();
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if (value.IsElement()) {
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return GetFrameForNode(value.GetAsElement(), GEOMETRY_NODE_ELEMENT,
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aCreateFramesForSuppressedWhitespace);
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}
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if (value.IsDocument()) {
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return GetFrameForNode(value.GetAsDocument(), GEOMETRY_NODE_DOCUMENT,
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aCreateFramesForSuppressedWhitespace);
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}
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return GetFrameForNode(value.GetAsText(), GEOMETRY_NODE_TEXT,
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aCreateFramesForSuppressedWhitespace);
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}
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static nsIFrame* GetFrameForGeometryNode(const GeometryNode& aGeometryNode) {
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// This will create frames for suppressed whitespace nodes.
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if (aGeometryNode.IsElement()) {
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return GetFrameForNode(&aGeometryNode.GetAsElement(), GEOMETRY_NODE_ELEMENT,
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true);
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}
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if (aGeometryNode.IsDocument()) {
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return GetFrameForNode(&aGeometryNode.GetAsDocument(),
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GEOMETRY_NODE_DOCUMENT, true);
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}
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return GetFrameForNode(&aGeometryNode.GetAsText(), GEOMETRY_NODE_TEXT, true);
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}
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static nsIFrame* GetFrameForNode(nsINode* aNode,
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bool aCreateFramesForSuppressedWhitespace) {
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if (aNode->IsElement()) {
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return GetFrameForNode(aNode, GEOMETRY_NODE_ELEMENT,
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aCreateFramesForSuppressedWhitespace);
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}
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if (aNode == aNode->OwnerDoc()) {
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return GetFrameForNode(aNode, GEOMETRY_NODE_DOCUMENT,
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aCreateFramesForSuppressedWhitespace);
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}
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NS_ASSERTION(aNode->IsText(), "Unknown node type");
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return GetFrameForNode(aNode, GEOMETRY_NODE_TEXT,
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aCreateFramesForSuppressedWhitespace);
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}
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static nsIFrame* GetFirstNonAnonymousFrameForGeometryNode(
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const Optional<OwningGeometryNode>& aNode, nsINode* aDefaultNode,
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bool aCreateFramesForSuppressedWhitespace) {
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nsIFrame* f = GetFrameForGeometryNode(aNode, aDefaultNode,
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aCreateFramesForSuppressedWhitespace);
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if (f) {
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f = nsLayoutUtils::GetFirstNonAnonymousFrame(f);
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}
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return f;
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}
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static nsIFrame* GetFirstNonAnonymousFrameForGeometryNode(
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const GeometryNode& aNode) {
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// This will create frames for suppressed whitespace nodes.
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nsIFrame* f = GetFrameForGeometryNode(aNode);
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if (f) {
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f = nsLayoutUtils::GetFirstNonAnonymousFrame(f);
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}
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return f;
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}
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static nsIFrame* GetFirstNonAnonymousFrameForNode(nsINode* aNode) {
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// This will create frames for suppressed whitespace nodes.
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nsIFrame* f = GetFrameForNode(aNode, true);
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if (f) {
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f = nsLayoutUtils::GetFirstNonAnonymousFrame(f);
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}
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return f;
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}
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/**
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* This can modify aFrame to point to a different frame. This is needed to
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* handle SVG, where SVG elements can only compute a rect that's valid with
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* respect to the "outer SVG" frame.
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*/
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static nsRect GetBoxRectForFrame(nsIFrame** aFrame, CSSBoxType aType) {
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nsRect r;
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nsIFrame* f = nsSVGUtils::GetOuterSVGFrameAndCoveredRegion(*aFrame, &r);
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if (f && f != *aFrame) {
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// For non-outer SVG frames, the BoxType is ignored.
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*aFrame = f;
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return r;
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}
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f = *aFrame;
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switch (aType) {
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case CSSBoxType::Content:
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r = f->GetContentRectRelativeToSelf();
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break;
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case CSSBoxType::Padding:
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r = f->GetPaddingRectRelativeToSelf();
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break;
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case CSSBoxType::Border:
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r = nsRect(nsPoint(0, 0), f->GetSize());
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break;
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case CSSBoxType::Margin:
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r = f->GetMarginRectRelativeToSelf();
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break;
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default:
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MOZ_ASSERT(false, "unknown box type");
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return r;
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}
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return r;
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}
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class AccumulateQuadCallback : public nsLayoutUtils::BoxCallback {
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public:
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AccumulateQuadCallback(Document* aParentObject,
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nsTArray<RefPtr<DOMQuad> >& aResult,
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nsIFrame* aRelativeToFrame,
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const nsPoint& aRelativeToBoxTopLeft,
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CSSBoxType aBoxType)
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: mParentObject(ToSupports(aParentObject)),
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mResult(aResult),
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mRelativeToFrame(aRelativeToFrame),
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mRelativeToBoxTopLeft(aRelativeToBoxTopLeft),
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mBoxType(aBoxType) {
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if (mBoxType == CSSBoxType::Margin) {
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// Don't include the caption margin when computing margins for a
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// table
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mIncludeCaptionBoxForTable = false;
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}
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}
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virtual void AddBox(nsIFrame* aFrame) override {
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nsIFrame* f = aFrame;
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if (mBoxType == CSSBoxType::Margin && f->IsTableFrame()) {
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// Margin boxes for table frames should be taken from the table wrapper
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// frame, since that has the margin.
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f = f->GetParent();
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}
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nsRect box = GetBoxRectForFrame(&f, mBoxType);
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nsPoint appUnits[4] = {box.TopLeft(), box.TopRight(), box.BottomRight(),
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box.BottomLeft()};
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CSSPoint points[4];
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for (uint32_t i = 0; i < 4; ++i) {
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points[i] =
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CSSPoint(nsPresContext::AppUnitsToFloatCSSPixels(appUnits[i].x),
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nsPresContext::AppUnitsToFloatCSSPixels(appUnits[i].y));
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}
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nsLayoutUtils::TransformResult rv =
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nsLayoutUtils::TransformPoints(f, mRelativeToFrame, 4, points);
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if (rv == nsLayoutUtils::TRANSFORM_SUCCEEDED) {
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CSSPoint delta(
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nsPresContext::AppUnitsToFloatCSSPixels(mRelativeToBoxTopLeft.x),
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nsPresContext::AppUnitsToFloatCSSPixels(mRelativeToBoxTopLeft.y));
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for (uint32_t i = 0; i < 4; ++i) {
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points[i] -= delta;
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}
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} else {
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PodArrayZero(points);
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}
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mResult.AppendElement(new DOMQuad(mParentObject, points));
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}
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nsISupports* mParentObject;
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nsTArray<RefPtr<DOMQuad> >& mResult;
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nsIFrame* mRelativeToFrame;
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nsPoint mRelativeToBoxTopLeft;
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CSSBoxType mBoxType;
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};
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static nsPresContext* FindTopLevelPresContext(nsPresContext* aPC) {
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bool isChrome = aPC->IsChrome();
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nsPresContext* pc = aPC;
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for (;;) {
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nsPresContext* parent = pc->GetParentPresContext();
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if (!parent || parent->IsChrome() != isChrome) {
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return pc;
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}
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pc = parent;
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}
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}
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static bool CheckFramesInSameTopLevelBrowsingContext(nsIFrame* aFrame1,
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nsIFrame* aFrame2,
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CallerType aCallerType) {
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nsPresContext* pc1 = aFrame1->PresContext();
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nsPresContext* pc2 = aFrame2->PresContext();
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if (pc1 == pc2) {
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return true;
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}
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if (aCallerType == CallerType::System) {
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return true;
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}
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if (FindTopLevelPresContext(pc1) == FindTopLevelPresContext(pc2)) {
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return true;
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}
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return false;
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}
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void GetBoxQuads(nsINode* aNode, const dom::BoxQuadOptions& aOptions,
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nsTArray<RefPtr<DOMQuad> >& aResult, CallerType aCallerType,
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ErrorResult& aRv) {
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nsIFrame* frame =
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GetFrameForNode(aNode, aOptions.mCreateFramesForSuppressedWhitespace);
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if (!frame) {
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// No boxes to return
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return;
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}
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AutoWeakFrame weakFrame(frame);
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Document* ownerDoc = aNode->OwnerDoc();
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nsIFrame* relativeToFrame = GetFirstNonAnonymousFrameForGeometryNode(
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aOptions.mRelativeTo, ownerDoc,
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aOptions.mCreateFramesForSuppressedWhitespace);
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// The first frame might be destroyed now if the above call lead to an
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// EnsureFrameForTextNode call. We need to get the first frame again
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// when that happens and re-check it.
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if (!weakFrame.IsAlive()) {
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frame =
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GetFrameForNode(aNode, aOptions.mCreateFramesForSuppressedWhitespace);
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if (!frame) {
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// No boxes to return
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return;
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}
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}
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if (!relativeToFrame) {
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aRv.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
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return;
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}
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if (!CheckFramesInSameTopLevelBrowsingContext(frame, relativeToFrame,
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aCallerType)) {
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aRv.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
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return;
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}
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// GetBoxRectForFrame can modify relativeToFrame so call it first.
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nsPoint relativeToTopLeft =
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GetBoxRectForFrame(&relativeToFrame, CSSBoxType::Border).TopLeft();
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AccumulateQuadCallback callback(ownerDoc, aResult, relativeToFrame,
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relativeToTopLeft, aOptions.mBox);
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nsLayoutUtils::GetAllInFlowBoxes(frame, &callback);
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}
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static void TransformPoints(nsINode* aTo, const GeometryNode& aFrom,
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uint32_t aPointCount, CSSPoint* aPoints,
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const ConvertCoordinateOptions& aOptions,
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CallerType aCallerType, ErrorResult& aRv) {
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nsIFrame* fromFrame = GetFirstNonAnonymousFrameForGeometryNode(aFrom);
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AutoWeakFrame weakFrame(fromFrame);
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nsIFrame* toFrame = GetFirstNonAnonymousFrameForNode(aTo);
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// The first frame might be destroyed now if the above call lead to an
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// EnsureFrameForTextNode call. We need to get the first frame again
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// when that happens.
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if (fromFrame && !weakFrame.IsAlive()) {
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fromFrame = GetFirstNonAnonymousFrameForGeometryNode(aFrom);
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}
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if (!fromFrame || !toFrame) {
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aRv.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
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return;
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}
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if (!CheckFramesInSameTopLevelBrowsingContext(fromFrame, toFrame,
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aCallerType)) {
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aRv.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
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return;
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}
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nsPoint fromOffset =
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GetBoxRectForFrame(&fromFrame, aOptions.mFromBox).TopLeft();
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nsPoint toOffset = GetBoxRectForFrame(&toFrame, aOptions.mToBox).TopLeft();
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CSSPoint fromOffsetGfx(nsPresContext::AppUnitsToFloatCSSPixels(fromOffset.x),
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nsPresContext::AppUnitsToFloatCSSPixels(fromOffset.y));
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for (uint32_t i = 0; i < aPointCount; ++i) {
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aPoints[i] += fromOffsetGfx;
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}
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nsLayoutUtils::TransformResult rv =
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nsLayoutUtils::TransformPoints(fromFrame, toFrame, aPointCount, aPoints);
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if (rv == nsLayoutUtils::TRANSFORM_SUCCEEDED) {
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CSSPoint toOffsetGfx(nsPresContext::AppUnitsToFloatCSSPixels(toOffset.x),
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nsPresContext::AppUnitsToFloatCSSPixels(toOffset.y));
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for (uint32_t i = 0; i < aPointCount; ++i) {
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aPoints[i] -= toOffsetGfx;
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}
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} else {
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PodZero(aPoints, aPointCount);
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}
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}
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already_AddRefed<DOMQuad> ConvertQuadFromNode(
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nsINode* aTo, dom::DOMQuad& aQuad, const GeometryNode& aFrom,
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const dom::ConvertCoordinateOptions& aOptions, CallerType aCallerType,
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ErrorResult& aRv) {
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CSSPoint points[4];
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for (uint32_t i = 0; i < 4; ++i) {
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DOMPoint* p = aQuad.Point(i);
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if (p->W() != 1.0 || p->Z() != 0.0) {
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aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
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return nullptr;
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}
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points[i] = CSSPoint(p->X(), p->Y());
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}
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TransformPoints(aTo, aFrom, 4, points, aOptions, aCallerType, aRv);
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if (aRv.Failed()) {
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return nullptr;
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}
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RefPtr<DOMQuad> result = new DOMQuad(aTo->GetParentObject().mObject, points);
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return result.forget();
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}
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already_AddRefed<DOMQuad> ConvertRectFromNode(
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nsINode* aTo, dom::DOMRectReadOnly& aRect, const GeometryNode& aFrom,
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const dom::ConvertCoordinateOptions& aOptions, CallerType aCallerType,
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ErrorResult& aRv) {
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CSSPoint points[4];
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double x = aRect.X(), y = aRect.Y(), w = aRect.Width(), h = aRect.Height();
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points[0] = CSSPoint(x, y);
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points[1] = CSSPoint(x + w, y);
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points[2] = CSSPoint(x + w, y + h);
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points[3] = CSSPoint(x, y + h);
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TransformPoints(aTo, aFrom, 4, points, aOptions, aCallerType, aRv);
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if (aRv.Failed()) {
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return nullptr;
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}
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RefPtr<DOMQuad> result = new DOMQuad(aTo->GetParentObject().mObject, points);
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return result.forget();
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}
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already_AddRefed<DOMPoint> ConvertPointFromNode(
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nsINode* aTo, const dom::DOMPointInit& aPoint, const GeometryNode& aFrom,
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const dom::ConvertCoordinateOptions& aOptions, CallerType aCallerType,
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ErrorResult& aRv) {
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if (aPoint.mW != 1.0 || aPoint.mZ != 0.0) {
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aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
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return nullptr;
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}
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CSSPoint point(aPoint.mX, aPoint.mY);
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TransformPoints(aTo, aFrom, 1, &point, aOptions, aCallerType, aRv);
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if (aRv.Failed()) {
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return nullptr;
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}
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RefPtr<DOMPoint> result =
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new DOMPoint(aTo->GetParentObject().mObject, point.x, point.y);
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return result.forget();
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}
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} // namespace mozilla
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