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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* represent a color combines a numeric color and currentcolor */
#ifndef mozilla_StyleComplexColor_h_
#define mozilla_StyleComplexColor_h_
#include "nsColor.h"
namespace mozilla {
/**
* This struct represents a combined color from a numeric color and
* the current foreground color (currentcolor keyword).
* Conceptually, the formula is "color * (1 - p) + currentcolor * p"
* where p is mForegroundRatio. See mozilla::LinearBlendColors for
* the actual algorithm.
*/
struct StyleComplexColor
{
nscolor mColor;
uint8_t mForegroundRatio;
// Whether the complex color represents a computed-value time auto
// value. This is only a flag indicating that this value should not
// be interpolatable with other colors, while other fields still
// represents the actual used color of this value.
bool mIsAuto;
static StyleComplexColor FromColor(nscolor aColor) {
return {aColor, 0, false};
}
static StyleComplexColor CurrentColor() {
return {NS_RGBA(0, 0, 0, 0), 255, false};
}
static StyleComplexColor Auto() {
return {NS_RGBA(0, 0, 0, 0), 255, true};
}
bool IsNumericColor() const { return mForegroundRatio == 0; }
bool IsCurrentColor() const { return mForegroundRatio == 255; }
bool operator==(const StyleComplexColor& aOther) const {
return mForegroundRatio == aOther.mForegroundRatio &&
(IsCurrentColor() || mColor == aOther.mColor) &&
mIsAuto == aOther.mIsAuto;
}
bool operator!=(const StyleComplexColor& aOther) const {
return !(*this == aOther);
}
};
}
#endif // mozilla_StyleComplexColor_h_
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