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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_CLIP_PATH_CLIPPER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_CLIP_PATH_CLIPPER_H_
#include "base/optional.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/geometry/float_rect.h"
#include "third_party/blink/renderer/platform/geometry/layout_point.h"
#include "third_party/blink/renderer/platform/graphics/path.h"
namespace blink {
class GraphicsContext;
class LayoutObject;
class CORE_EXPORT ClipPathClipper {
DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
public:
ClipPathClipper(GraphicsContext&,
const LayoutObject&,
const LayoutPoint& paint_offset);
~ClipPathClipper();
// Returns the reference box used by CSS clip-path. For HTML objects,
// this is the border box of the element. For SVG objects this is the
// object bounding box.
static FloatRect LocalReferenceBox(const LayoutObject&);
// Returns the bounding box of the computed clip path, which could be
// smaller or bigger than the reference box. Returns nullopt if the
// clip path is invalid.
static base::Optional<FloatRect> LocalClipPathBoundingBox(
const LayoutObject&);
// The argument |clip_path_owner| is the layout object that owns the
// ClipPathOperation we are currently processing. Usually it is the
// same as the layout object getting clipped, but in the case of nested
// clip-path, it could be one of the SVG clip path in the chain.
// The output is tri-state:
// is_valid == false: The clip path is invalid. Always returns nullopt.
// is_valid == true && return == nullopt: The clip path is valid,
// but cannot use path-based clip.
// is_valid == true && return != nullopt: The clip path can be applied
// as path-based clip, and the computed path is returned.
static base::Optional<Path> PathBasedClip(const LayoutObject& clip_path_owner,
bool is_svg_child,
const FloatRect& reference_box,
bool& is_valid);
private:
GraphicsContext& context_;
const LayoutObject& layout_object_;
LayoutPoint paint_offset_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_CLIP_PATH_CLIPPER_H_
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