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/**
* 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 THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_SVG_SVG_LAYOUT_SUPPORT_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_SVG_SVG_LAYOUT_SUPPORT_H_
#include "third_party/blink/renderer/core/layout/layout_object.h"
#include "third_party/blink/renderer/platform/graphics/dash_array.h"
#include "third_party/blink/renderer/platform/transforms/affine_transform.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
class AffineTransform;
class FloatPoint;
class FloatRect;
class LayoutBoxModelObject;
class LayoutObject;
class ComputedStyle;
class SVGLengthContext;
class StrokeData;
class TransformState;
class CORE_EXPORT SVGLayoutSupport {
STATIC_ONLY(SVGLayoutSupport);
public:
// Helper function determining whether overflow is hidden.
static bool IsOverflowHidden(const LayoutObject&);
static bool IsOverflowHidden(const ComputedStyle&);
// Adjusts the visual rect with clipper and masker in local coordinates.
static void AdjustWithClipPathAndMask(const LayoutObject& layout_object,
const FloatRect& object_bounding_box,
FloatRect& visual_rect);
// Add any contribution from 'stroke' to a text content bounding rect.
static FloatRect ExtendTextBBoxWithStroke(const LayoutObject&,
const FloatRect& text_bounds);
// Compute the visual rect for the a text content LayoutObject.
static FloatRect ComputeVisualRectForText(const LayoutObject&,
const FloatRect& text_bounds);
// Determine whether the passed location intersects a clip path referenced by
// the passed LayoutObject.
// |reference_box| is used to resolve 'objectBoundingBox' units/percentages,
// and can differ from the reference box of the passed LayoutObject.
static bool IntersectsClipPath(const LayoutObject&,
const FloatRect& reference_box,
const HitTestLocation&);
// Important functions used by nearly all SVG layoutObjects centralizing
// coordinate transformations / visual rect calculations
static FloatRect LocalVisualRect(const LayoutObject&);
static PhysicalRect VisualRectInAncestorSpace(
const LayoutObject&,
const LayoutBoxModelObject& ancestor,
VisualRectFlags = kDefaultVisualRectFlags);
static bool MapToVisualRectInAncestorSpace(
const LayoutObject&,
const LayoutBoxModelObject* ancestor,
const FloatRect& local_visual_rect,
PhysicalRect& result_rect,
VisualRectFlags = kDefaultVisualRectFlags);
static void MapLocalToAncestor(const LayoutObject*,
const LayoutBoxModelObject* ancestor,
TransformState&,
MapCoordinatesFlags);
static void MapAncestorToLocal(const LayoutObject&,
const LayoutBoxModelObject* ancestor,
TransformState&,
MapCoordinatesFlags);
// Shared between SVG layoutObjects and resources.
static void ApplyStrokeStyleToStrokeData(StrokeData&,
const ComputedStyle&,
const LayoutObject&,
float dash_scale_factor);
static DashArray ResolveSVGDashArray(const SVGDashArray&,
const ComputedStyle&,
const SVGLengthContext&);
// Determines if any ancestor has adjusted the scale factor.
static bool ScreenScaleFactorChanged(const LayoutObject*);
// Determines if any ancestor's layout size has changed.
static bool LayoutSizeOfNearestViewportChanged(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*);
static bool IsIsolationRequired(const LayoutObject*);
static AffineTransform DeprecatedCalculateTransformToLayer(
const LayoutObject*);
static float CalculateScreenFontSizeScalingFactor(const LayoutObject*);
// This returns a LayoutSVGText, a LayoutNGSVGText, or nullptr.
static LayoutObject* FindClosestLayoutSVGText(const LayoutObject*,
const FloatPoint&);
static void NotifySVGRootOfChangedCompositingReasons(const LayoutObject*);
};
class SubtreeContentTransformScope {
STACK_ALLOCATED();
public:
SubtreeContentTransformScope(const AffineTransform&);
~SubtreeContentTransformScope();
static AffineTransform CurrentContentTransformation() {
return AffineTransform(current_content_transformation_);
}
private:
static AffineTransform::Transform current_content_transformation_;
AffineTransform saved_content_transformation_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_SVG_SVG_LAYOUT_SUPPORT_H_
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