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// Copyright (C) 2013 Google Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_STYLED_STROKE_DATA_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_STYLED_STROKE_DATA_H_
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace cc {
class PaintFlags;
} // namespace cc
namespace blink {
class StrokeData;
enum StrokeStyle {
kSolidStroke,
kDottedStroke,
kDashedStroke,
kDoubleStroke,
kWavyStroke,
};
// Stroke geometry information based on a specified style (StrokeStyle).
//
// Used to represent decorations (borders, outline, underline and other text
// decorations).
//
// If full control is required, use StrokeData.
class PLATFORM_EXPORT StyledStrokeData final {
DISALLOW_NEW();
public:
StrokeStyle Style() const { return style_; }
void SetStyle(StrokeStyle style) { style_ = style; }
float Thickness() const { return thickness_; }
void SetThickness(float thickness) { thickness_ = thickness; }
// Transfer the stroke data to the PaintFlags object.
void SetupPaint(cc::PaintFlags*) const;
// Structure that describe the geometry of the object that this stroke will
// be applied to.
//
// If a non-zero `path_length` is provided, the number of dashes/dots on a
// dashed/dotted line will be adjusted to start and end that length with a
// dash/dot.
//
// If non-zero, `dash_thickness` is the thickness to use when deciding on
// dash sizes. Used in border painting when we stroke thick to allow for
// clipping at corners, but still want small dashes.
//
// If `closed_path` is true, a gap will be allocated after the last dash, so
// that all dashes will be evenly spaced on the closed path.
struct GeometryInfo {
int path_length = 0;
int dash_thickness = 0;
bool closed_path = false;
};
// Transfer the stroke data to the PaintFlags object, resolving any
// DashPathEffect using the specified GeometryInfo.
void SetupPaint(cc::PaintFlags*, const GeometryInfo&) const;
// Convert this stroke geometry information to the "resolved" representation.
StrokeData ConvertToStrokeData(const GeometryInfo&) const;
// Determine whether a stroked line should be drawn using dashes. In practice,
// we draw dashes when a dashed stroke is specified or when a dotted stroke
// is specified but the line width is too small to draw circles.
static bool StrokeIsDashed(float width, StrokeStyle);
private:
// Resolve and set any DashPathEffect on the paint.
void SetupPaintDashPathEffect(cc::PaintFlags*, const GeometryInfo&) const;
StrokeStyle style_ = kSolidStroke;
float thickness_ = 0;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_STYLED_STROKE_DATA_H_
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