1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/**
* Copyright (C) 2007 Rob Buis <buis@kde.org>
* Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Google, Inc. All rights reserved.
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef SVGLayoutSupport_h
#define SVGLayoutSupport_h
#include "core/layout/LayoutObject.h"
#include "core/style/SVGComputedStyleDefs.h"
#include "platform/graphics/DashArray.h"
#include "platform/transforms/AffineTransform.h"
#include "wtf/Allocator.h"
namespace blink {
class AffineTransform;
class FloatPoint;
class FloatRect;
class PaintInvalidationState;
class LayoutRect;
class LayoutGeometryMap;
class LayoutBoxModelObject;
class LayoutObject;
class ComputedStyle;
class LayoutSVGRoot;
class SVGLengthContext;
class StrokeData;
class TransformState;
class SVGLayoutSupport {
STATIC_ONLY(SVGLayoutSupport);
public:
// Shares child layouting code between LayoutSVGRoot/LayoutSVG(Hidden)Container
static void layoutChildren(LayoutObject*, bool selfNeedsLayout);
// Layout resources used by this node.
static void layoutResourcesIfNeeded(const LayoutObject*);
// Helper function determining whether overflow is hidden.
static bool isOverflowHidden(const LayoutObject*);
// Calculates the paintInvalidationRect in combination with filter, clipper and masker in local coordinates.
static void intersectPaintInvalidationRectWithResources(const LayoutObject*, FloatRect&);
// Determines whether a container needs to be laid out because it's filtered and a child is being laid out.
static bool filtersForceContainerLayout(LayoutObject*);
// Determines whether the passed point lies in a clipping area
static bool pointInClippingArea(const LayoutObject*, const FloatPoint&);
// Transform |pointInParent| to |object|'s user-space and check if it is
// within the clipping area. Returns false if the transform is singular or
// the point is outside the clipping area.
static bool transformToUserSpaceAndCheckClipping(const LayoutObject*, const AffineTransform& localTransform, const FloatPoint& pointInParent, FloatPoint& localPoint);
static void computeContainerBoundingBoxes(const LayoutObject* container, FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, FloatRect& strokeBoundingBox, FloatRect& paintInvalidationBoundingBox);
// Important functions used by nearly all SVG layoutObjects centralizing coordinate transformations / paint invalidation rect calculations
static FloatRect localOverflowRectForPaintInvalidation(const LayoutObject&);
static LayoutRect clippedOverflowRectForPaintInvalidation(const LayoutObject&, const LayoutBoxModelObject& paintInvalidationContainer);
static LayoutRect transformPaintInvalidationRect(const LayoutObject&, const AffineTransform&, const FloatRect&);
static bool mapToVisibleRectInAncestorSpace(const LayoutObject&, const LayoutBoxModelObject* ancestor, const FloatRect& localPaintInvalidationRect, LayoutRect& resultRect, VisibleRectFlags = DefaultVisibleRectFlags);
static void mapLocalToAncestor(const LayoutObject*, const LayoutBoxModelObject* ancestor, TransformState&, bool* wasFixed = nullptr);
static void mapAncestorToLocal(const LayoutObject&, const LayoutBoxModelObject* ancestor, TransformState&);
static const LayoutObject* pushMappingToContainer(const LayoutObject*, const LayoutBoxModelObject* ancestorToStopAt, LayoutGeometryMap&);
// Shared between SVG layoutObjects and resources.
static void applyStrokeStyleToStrokeData(StrokeData&, const ComputedStyle&, const LayoutObject&, float dashScaleFactor);
static DashArray resolveSVGDashArray(const SVGDashArray&, const ComputedStyle&, const SVGLengthContext&);
// Determines if any ancestor's transform has changed.
static bool transformToRootChanged(LayoutObject*);
// FIXME: These methods do not belong here.
static const LayoutSVGRoot* findTreeRootObject(const LayoutObject*);
// Helper method for determining if a LayoutObject marked as text (isText()== true)
// can/will be laid out as part of a <text>.
static bool isLayoutableTextNode(const LayoutObject*);
// Determines whether a svg node should isolate or not based on ComputedStyle.
static bool willIsolateBlendingDescendantsForStyle(const ComputedStyle&);
static bool willIsolateBlendingDescendantsForObject(const LayoutObject*);
template<typename LayoutObjectType>
static bool computeHasNonIsolatedBlendingDescendants(const LayoutObjectType*);
static bool isIsolationRequired(const LayoutObject*);
static AffineTransform deprecatedCalculateTransformToLayer(const LayoutObject*);
static float calculateScreenFontSizeScalingFactor(const LayoutObject*);
static LayoutObject* findClosestLayoutSVGText(LayoutObject*, const FloatPoint&);
private:
static void updateObjectBoundingBox(FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, LayoutObject* other, FloatRect otherBoundingBox);
static bool layoutSizeOfNearestViewportChanged(const LayoutObject* start);
};
class SubtreeContentTransformScope {
STACK_ALLOCATED();
public:
SubtreeContentTransformScope(const AffineTransform&);
~SubtreeContentTransformScope();
static AffineTransform currentContentTransformation() { return AffineTransform(s_currentContentTransformation); }
private:
static AffineTransform::Transform s_currentContentTransformation;
AffineTransform m_savedContentTransformation;
};
template <typename LayoutObjectType>
bool SVGLayoutSupport::computeHasNonIsolatedBlendingDescendants(const LayoutObjectType* object)
{
for (LayoutObject* child = object->firstChild(); child; child = child->nextSibling()) {
if (child->isBlendingAllowed() && child->style()->hasBlendMode())
return true;
if (child->hasNonIsolatedBlendingDescendants() && !willIsolateBlendingDescendantsForObject(child))
return true;
}
return false;
}
} // namespace blink
#endif // SVGLayoutSupport_h
|
