зеркало из https://github.com/mozilla/gecko-dev.git
52 строки
1.6 KiB
C
52 строки
1.6 KiB
C
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* represent a color combines a numeric color and currentcolor */
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#ifndef mozilla_StyleComplexColor_h_
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#define mozilla_StyleComplexColor_h_
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#include "nsColor.h"
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namespace mozilla {
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/**
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* This struct represents a combined color from a numeric color and
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* the current foreground color (currentcolor keyword).
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* Conceptually, the formula is "color * (1 - p) + currentcolor * p"
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* where p is mForegroundRatio. See mozilla::LinearBlendColors for
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* the actual algorithm.
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*/
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struct StyleComplexColor
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{
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nscolor mColor;
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uint8_t mForegroundRatio;
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StyleComplexColor() {}
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StyleComplexColor(nscolor aColor, uint_fast8_t aForegroundRatio)
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: mColor(aColor), mForegroundRatio(aForegroundRatio) {}
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static StyleComplexColor FromColor(nscolor aColor)
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{ return StyleComplexColor(aColor, 0); }
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static StyleComplexColor CurrentColor()
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{ return StyleComplexColor(NS_RGBA(0, 0, 0, 0), 255); }
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bool IsNumericColor() const { return mForegroundRatio == 0; }
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bool IsCurrentColor() const { return mForegroundRatio == 255; }
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bool operator==(const StyleComplexColor& aOther) const {
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return mForegroundRatio == aOther.mForegroundRatio &&
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(IsCurrentColor() || mColor == aOther.mColor);
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}
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bool operator!=(const StyleComplexColor& aOther) const {
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return !(*this == aOther);
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}
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};
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}
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#endif // mozilla_StyleComplexColor_h_
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