layout/style/StyleColor.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/StyleColorInlines.h"
   8
   9 #include "mozilla/ComputedStyle.h"
  10 #include "mozilla/ComputedStyleInlines.h"
  11 #include "mozilla/dom/BindingDeclarations.h"
  12 #include "nsIFrame.h"
  13 #include "nsStyleStruct.h"
  14
  15 namespace mozilla {
  16
  17 template <>
  18 bool StyleColor::MaybeTransparent() const {
  19   // We know that the color is opaque when it's a numeric color with
  20   // alpha == 1.0.
  21   return !IsAbsolute() || AsAbsolute().alpha != 1.0f;
  22 }
  23
  24 template <>
  25 StyleAbsoluteColor StyleColor::ResolveColor(
  26     const StyleAbsoluteColor& aForegroundColor) const {
  27   if (IsAbsolute()) {
  28     return AsAbsolute();
  29   }
  30
  31   if (IsCurrentColor()) {
  32     return aForegroundColor;
  33   }
  34
  35   MOZ_ASSERT(IsColorMix(), "should be the only type left at this point.");
  36   return Servo_ResolveColor(this, &aForegroundColor);
  37 }
  38
  39 template <>
  40 nscolor StyleColor::CalcColor(nscolor aColor) const {
  41   return ResolveColor(StyleAbsoluteColor::FromColor(aColor)).ToColor();
  42 }
  43
  44 template <>
  45 nscolor StyleColor::CalcColor(
  46     const StyleAbsoluteColor& aForegroundColor) const {
  47   return ResolveColor(aForegroundColor).ToColor();
  48 }
  49
  50 template <>
  51 nscolor StyleColor::CalcColor(const ComputedStyle& aStyle) const {
  52   return ResolveColor(aStyle.StyleText()->mColor).ToColor();
  53 }
  54
  55 template <>
  56 nscolor StyleColor::CalcColor(const nsIFrame* aFrame) const {
  57   return ResolveColor(aFrame->StyleText()->mColor).ToColor();
  58 }
  59
  60 StyleAbsoluteColor StyleAbsoluteColor::ToColorSpace(
  61     StyleColorSpace aColorSpace) const {
  62   return Servo_ConvertColorSpace(this, aColorSpace);
  63 }
  64
  65 nscolor StyleAbsoluteColor::ToColor() const {
  66   auto srgb = ToColorSpace(StyleColorSpace::Srgb);
  67
  68   // TODO(tlouw): Needs gamut mapping here. Right now we just hard clip the
  69   //              components to [0..1], which will yield invalid colors.
  70   //              https://bugzilla.mozilla.org/show_bug.cgi?id=1626624
  71   auto red = std::clamp(srgb.components._0, 0.0f, 1.0f);
  72   auto green = std::clamp(srgb.components._1, 0.0f, 1.0f);
  73   auto blue = std::clamp(srgb.components._2, 0.0f, 1.0f);
  74
  75   return NS_RGBA(nsStyleUtil::FloatToColorComponent(red),
  76                  nsStyleUtil::FloatToColorComponent(green),
  77                  nsStyleUtil::FloatToColorComponent(blue),
  78                  nsStyleUtil::FloatToColorComponent(srgb.alpha));
  79 }
  80
  81 }  // namespace mozilla