forked from mirrors/gecko-dev
232d35f4b9
Backed out changeset 8694fe928b04 (bug 1467622) Backed out changeset 74533cad9479 (bug 1467622) Backed out changeset e1dbee410e98 (bug 1467622) Backed out changeset 56142038cc7f (bug 1467622) Backed out changeset 90cede21bad1 (bug 1467622)
131 lines
3.6 KiB
C++
131 lines
3.6 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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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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