| /* |
| * 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_ |