forked from mirrors/gecko-dev
f482ffa15d
There's no need for CurrentColor / Numeric variants when we can represent them with the complex form. Differential Revision: https://phabricator.services.mozilla.com/D106690
90 lines
2.6 KiB
C++
90 lines
2.6 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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#include "mozilla/StyleColorInlines.h"
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#include "mozilla/ComputedStyle.h"
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#include "mozilla/ComputedStyleInlines.h"
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#include "nsIFrame.h"
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#include "nsStyleStruct.h"
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namespace mozilla {
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// Blend one RGBA color with another based on a given ratios.
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// It is a linear combination of each channel with alpha premultipled.
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static nscolor LinearBlendColors(const StyleRGBA& aBg, float aBgRatio,
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const StyleRGBA& aFg, float aFgRatio) {
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constexpr float kFactor = 1.0f / 255.0f;
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float p1 = aBgRatio;
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float a1 = kFactor * aBg.alpha;
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float r1 = a1 * aBg.red;
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float g1 = a1 * aBg.green;
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float b1 = a1 * aBg.blue;
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float p2 = aFgRatio;
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float a2 = kFactor * aFg.alpha;
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float r2 = a2 * aFg.red;
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float g2 = a2 * aFg.green;
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float b2 = a2 * aFg.blue;
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float a = p1 * a1 + p2 * a2;
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if (a <= 0.f) {
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return NS_RGBA(0, 0, 0, 0);
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}
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if (a > 1.f) {
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a = 1.f;
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}
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auto r = ClampColor((p1 * r1 + p2 * r2) / a);
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auto g = ClampColor((p1 * g1 + p2 * g2) / a);
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auto b = ClampColor((p1 * b1 + p2 * b2) / a);
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return NS_RGBA(r, g, b, NSToIntRound(a * 255));
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}
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template <>
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bool StyleColor::MaybeTransparent() const {
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// We know that the color is opaque when it's a numeric color with
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// alpha == 255.
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return ratios != StyleComplexColorRatios::NUMERIC || color.alpha != 255;
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}
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template <>
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nscolor StyleColor::CalcColor(nscolor aColor) const {
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return CalcColor(StyleRGBA::FromColor(aColor));
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}
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template <>
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nscolor StyleColor::CalcColor(const StyleRGBA& aForegroundColor) const {
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if (ratios == StyleComplexColorRatios::NUMERIC) {
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return color.ToColor();
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}
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if (ratios == StyleComplexColorRatios::CURRENT_COLOR) {
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return aForegroundColor.ToColor();
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}
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return LinearBlendColors(color, ratios.bg, aForegroundColor, ratios.fg);
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}
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template <>
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nscolor StyleColor::CalcColor(const ComputedStyle& aStyle) const {
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// Common case that is numeric color, which is pure background, we
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// can skip resolving StyleText().
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if (ratios == StyleComplexColorRatios::NUMERIC) {
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return color.ToColor();
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}
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return CalcColor(aStyle.StyleText()->mColor);
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}
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template <>
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nscolor StyleColor::CalcColor(const nsIFrame* aFrame) const {
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if (ratios == StyleComplexColorRatios::NUMERIC) {
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return color.ToColor();
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}
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return CalcColor(aFrame->StyleText()->mColor);
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}
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} // namespace mozilla
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