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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
*
* 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_STYLE_BORDER_VALUE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_BORDER_VALUE_H_
#include "third_party/blink/renderer/core/css/style_color.h"
#include "third_party/blink/renderer/core/style/computed_style_constants.h"
#include "third_party/blink/renderer/platform/graphics/color.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
namespace blink {
// In order to conserve memory, the border width uses fixed point,
// which can be bitpacked. This fixed point implementation is
// essentially the same as in LayoutUnit. Six bits are used for the
// fraction, which leaves 20 bits for the integer part, making 1048575
// the largest number.
static const int kBorderWidthFractionalBits = 6;
static const int kBorderWidthDenominator = 1 << kBorderWidthFractionalBits;
static const int kMaxForBorderWidth = ((1 << 26) - 1) / kBorderWidthDenominator;
class BorderValue {
DISALLOW_NEW();
friend class ComputedStyle;
public:
BorderValue()
: color_(0),
color_is_current_color_(true),
style_(static_cast<unsigned>(EBorderStyle::kNone)) {
SetWidth(3);
}
BorderValue(EBorderStyle style, const StyleColor& color, float width) {
SetColor(color);
SetStyle(style);
SetWidth(width);
}
bool IsTransparent() const {
return !color_is_current_color_ && !color_.Alpha();
}
bool operator==(const BorderValue& o) const {
return width_ == o.width_ && style_ == o.style_ && color_ == o.color_ &&
color_is_current_color_ == o.color_is_current_color_;
}
// The default width is 3px, but if the style is none we compute a value of 0
// (in ComputedStyle itself)
bool VisuallyEqual(const BorderValue& o) const {
if (style_ == static_cast<unsigned>(EBorderStyle::kNone) &&
o.style_ == static_cast<unsigned>(EBorderStyle::kNone))
return true;
if (style_ == static_cast<unsigned>(EBorderStyle::kHidden) &&
o.style_ == static_cast<unsigned>(EBorderStyle::kHidden))
return true;
return *this == o;
}
bool operator!=(const BorderValue& o) const { return !(*this == o); }
void SetColor(const StyleColor& color) {
color_ = color.Resolve(Color());
color_is_current_color_ = color.IsCurrentColor();
}
StyleColor GetColor() const {
return color_is_current_color_ ? StyleColor::CurrentColor()
: StyleColor(color_);
}
float Width() const {
return static_cast<float>(width_) / kBorderWidthDenominator;
}
void SetWidth(float width) { width_ = WidthToFixedPoint(width); }
// Since precision is lost with fixed point, comparisons also have
// to be done in fixed point.
bool WidthEquals(float width) const {
return WidthToFixedPoint(width) == width_;
}
EBorderStyle Style() const { return static_cast<EBorderStyle>(style_); }
void SetStyle(EBorderStyle style) { style_ = static_cast<unsigned>(style); }
bool ColorIsCurrentColor() const { return color_is_current_color_; }
void SetColorIsCurrentColor(bool color_is_current_color) {
color_is_current_color_ = static_cast<unsigned>(color_is_current_color);
}
protected:
static unsigned WidthToFixedPoint(float width) {
DCHECK_GE(width, 0);
// Avoid min()/max() from std here in the header, because that would require
// inclusion of <algorithm>, which is slow to compile.
if (width > float(kMaxForBorderWidth))
width = float(kMaxForBorderWidth);
return static_cast<unsigned>(width * kBorderWidthDenominator);
}
Color color_;
unsigned color_is_current_color_ : 1;
unsigned width_ : 26; // Fixed point width
unsigned style_ : 4; // EBorderStyle
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_BORDER_VALUE_H_
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