forked from mirrors/gecko-dev
c9c954a337
MozReview-Commit-ID: 1bbQzOoOuBe --HG-- extra : rebase_source : 1631a71a78b0e6fbc4842ee14e11e946a5063afa
141 lines
3.9 KiB
C++
141 lines
3.9 KiB
C++
/* -*- 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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class nsIFrame;
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namespace mozilla {
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class ComputedStyle;
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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 * q + currentcolor * p"
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* where p is mFgRatio and q is mBgRatio.
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*
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* It can also represent an "auto" value, which is valid for some
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* properties. See comment of `Tag::eAuto`.
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*/
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class StyleComplexColor final
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{
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public:
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static StyleComplexColor FromColor(nscolor aColor) {
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return {aColor, 0, eNumeric};
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}
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static StyleComplexColor CurrentColor() {
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return {NS_RGBA(0, 0, 0, 0), 1, eForeground};
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}
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static StyleComplexColor Auto() {
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return {NS_RGBA(0, 0, 0, 0), 1, eAuto};
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}
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static StyleComplexColor Black() {
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return StyleComplexColor::FromColor(NS_RGB(0, 0, 0));
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}
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static StyleComplexColor White() {
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return StyleComplexColor::FromColor(NS_RGB(255, 255, 255));
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}
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static StyleComplexColor Transparent() {
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return StyleComplexColor::FromColor(NS_RGBA(0, 0, 0, 0));
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}
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bool IsAuto() const { return mTag == eAuto; }
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bool IsCurrentColor() const { return mTag == eForeground; }
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bool operator==(const StyleComplexColor& aOther) const {
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if (mTag != aOther.mTag) {
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return false;
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}
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switch (mTag) {
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case eAuto:
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case eForeground:
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return true;
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case eNumeric:
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return mColor == aOther.mColor;
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case eComplex:
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return (mBgRatio == aOther.mBgRatio &&
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mFgRatio == aOther.mFgRatio &&
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mColor == aOther.mColor);
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default:
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MOZ_ASSERT_UNREACHABLE("Unexpected StyleComplexColor type.");
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return false;
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}
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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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* Is it possible that this StyleComplexColor is transparent?
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*/
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bool MaybeTransparent() const;
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/**
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* Compute the color for this StyleComplexColor, taking into account
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* the foreground color, aForegroundColor.
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*/
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nscolor CalcColor(nscolor aForegroundColor) const;
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/**
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* Compute the color for this StyleComplexColor, taking into account
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* the foreground color from aStyle.
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*/
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nscolor CalcColor(mozilla::ComputedStyle* aStyle) const;
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/**
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* Compute the color for this StyleComplexColor, taking into account
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* the foreground color from aFrame's ComputedStyle.
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*/
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nscolor CalcColor(const nsIFrame* aFrame) const;
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private:
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enum Tag : uint8_t {
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// This represents a computed-value time auto value. This
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// indicates that this value should not be interpolatable with
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// other colors. Other fields represent a currentcolor and
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// properties can decide whether that should be used.
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eAuto,
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// This represents a numeric color; no currentcolor component.
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eNumeric,
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// This represents the current foreground color, currentcolor; no
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// numeric color component.
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eForeground,
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// This represents a linear combination of numeric color and the
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// foreground color: "mColor * mBgRatio + currentcolor *
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// mFgRatio".
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eComplex,
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};
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StyleComplexColor(nscolor aColor,
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float aFgRatio,
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Tag aTag)
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: mColor(aColor)
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, mBgRatio(1.f - aFgRatio)
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, mFgRatio(aFgRatio)
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, mTag(aTag)
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{
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MOZ_ASSERT(mTag != eNumeric || aFgRatio == 0.);
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MOZ_ASSERT(!(mTag == eAuto || mTag == eForeground) || aFgRatio == 1.);
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}
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nscolor mColor;
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float mBgRatio;
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float mFgRatio;
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Tag mTag;
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};
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} // namespace mozilla
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#endif // mozilla_StyleComplexColor_h_
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