зеркало из https://github.com/mozilla/gecko-dev.git
590 строки
20 KiB
C++
590 строки
20 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 "nsTextPaintStyle.h"
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#include "nsCSSColorUtils.h"
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#include "nsCSSRendering.h"
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#include "nsFrameSelection.h"
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#include "nsLayoutUtils.h"
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#include "nsTextFrame.h"
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#include "nsStyleConsts.h"
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#include "mozilla/LookAndFeel.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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static nscolor EnsureDifferentColors(nscolor colorA, nscolor colorB) {
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if (colorA == colorB) {
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nscolor res;
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res = NS_RGB(NS_GET_R(colorA) ^ 0xff, NS_GET_G(colorA) ^ 0xff,
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NS_GET_B(colorA) ^ 0xff);
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return res;
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}
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return colorA;
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}
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nsTextPaintStyle::nsTextPaintStyle(nsTextFrame* aFrame)
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: mFrame(aFrame),
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mPresContext(aFrame->PresContext()),
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mInitCommonColors(false),
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mInitSelectionColorsAndShadow(false),
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mResolveColors(true),
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mSelectionTextColor(NS_RGBA(0, 0, 0, 0)),
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mSelectionBGColor(NS_RGBA(0, 0, 0, 0)),
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mSufficientContrast(0),
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mFrameBackgroundColor(NS_RGBA(0, 0, 0, 0)),
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mSystemFieldForegroundColor(NS_RGBA(0, 0, 0, 0)),
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mSystemFieldBackgroundColor(NS_RGBA(0, 0, 0, 0)) {
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for (uint32_t i = 0; i < ArrayLength(mSelectionStyle); i++)
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mSelectionStyle[i].mInit = false;
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}
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bool nsTextPaintStyle::EnsureSufficientContrast(nscolor* aForeColor,
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nscolor* aBackColor) {
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InitCommonColors();
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const bool sameAsForeground = *aForeColor == NS_SAME_AS_FOREGROUND_COLOR;
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if (sameAsForeground) {
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*aForeColor = GetTextColor();
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}
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// If the combination of selection background color and frame background color
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// has sufficient contrast, don't exchange the selection colors.
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//
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// Note we use a different threshold here: mSufficientContrast is for contrast
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// between text and background colors, but since we're diffing two
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// backgrounds, we don't need that much contrast. We match the heuristic from
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// NS_SUFFICIENT_LUMINOSITY_DIFFERENCE_BG and use 20% of mSufficientContrast.
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const int32_t minLuminosityDifferenceForBackground = mSufficientContrast / 5;
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const int32_t backLuminosityDifference =
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NS_LUMINOSITY_DIFFERENCE(*aBackColor, mFrameBackgroundColor);
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if (backLuminosityDifference >= minLuminosityDifferenceForBackground) {
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return false;
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}
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// Otherwise, we should use the higher-contrast color for the selection
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// background color.
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//
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// For NS_SAME_AS_FOREGROUND_COLOR we only do this if the background is
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// totally indistinguishable, that is, if the luminosity difference is 0.
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if (sameAsForeground && backLuminosityDifference) {
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return false;
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}
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int32_t foreLuminosityDifference =
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NS_LUMINOSITY_DIFFERENCE(*aForeColor, mFrameBackgroundColor);
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if (backLuminosityDifference < foreLuminosityDifference) {
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std::swap(*aForeColor, *aBackColor);
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// Ensure foreground color is opaque to guarantee contrast.
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*aForeColor = NS_RGB(NS_GET_R(*aForeColor), NS_GET_G(*aForeColor),
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NS_GET_B(*aForeColor));
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return true;
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}
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return false;
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}
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nscolor nsTextPaintStyle::GetTextColor() {
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if (mFrame->IsInSVGTextSubtree()) {
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if (!mResolveColors) {
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return NS_SAME_AS_FOREGROUND_COLOR;
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}
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const nsStyleSVG* style = mFrame->StyleSVG();
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switch (style->mFill.kind.tag) {
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case StyleSVGPaintKind::Tag::None:
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return NS_RGBA(0, 0, 0, 0);
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case StyleSVGPaintKind::Tag::Color:
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return nsLayoutUtils::GetColor(mFrame, &nsStyleSVG::mFill);
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default:
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NS_ERROR("cannot resolve SVG paint to nscolor");
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return NS_RGBA(0, 0, 0, 255);
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}
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}
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return nsLayoutUtils::GetColor(mFrame, &nsStyleText::mWebkitTextFillColor);
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}
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bool nsTextPaintStyle::GetSelectionColors(nscolor* aForeColor,
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nscolor* aBackColor) {
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NS_ASSERTION(aForeColor, "aForeColor is null");
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NS_ASSERTION(aBackColor, "aBackColor is null");
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if (!InitSelectionColorsAndShadow()) {
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return false;
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}
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*aForeColor = mSelectionTextColor;
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*aBackColor = mSelectionBGColor;
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return true;
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}
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void nsTextPaintStyle::GetHighlightColors(nscolor* aForeColor,
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nscolor* aBackColor) {
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NS_ASSERTION(aForeColor, "aForeColor is null");
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NS_ASSERTION(aBackColor, "aBackColor is null");
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const nsFrameSelection* frameSelection = mFrame->GetConstFrameSelection();
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const Selection* selection =
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frameSelection->GetSelection(SelectionType::eFind);
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const SelectionCustomColors* customColors = nullptr;
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if (selection) {
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customColors = selection->GetCustomColors();
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}
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if (!customColors) {
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nscolor backColor = LookAndFeel::Color(
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LookAndFeel::ColorID::TextHighlightBackground, mFrame);
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nscolor foreColor = LookAndFeel::Color(
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LookAndFeel::ColorID::TextHighlightForeground, mFrame);
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EnsureSufficientContrast(&foreColor, &backColor);
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*aForeColor = foreColor;
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*aBackColor = backColor;
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return;
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}
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if (customColors->mForegroundColor && customColors->mBackgroundColor) {
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nscolor foreColor = *customColors->mForegroundColor;
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nscolor backColor = *customColors->mBackgroundColor;
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if (EnsureSufficientContrast(&foreColor, &backColor) &&
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customColors->mAltForegroundColor &&
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customColors->mAltBackgroundColor) {
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foreColor = *customColors->mAltForegroundColor;
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backColor = *customColors->mAltBackgroundColor;
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}
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*aForeColor = foreColor;
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*aBackColor = backColor;
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return;
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}
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InitCommonColors();
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if (customColors->mBackgroundColor) {
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// !mForegroundColor means "currentColor"; the current color of the text.
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nscolor foreColor = GetTextColor();
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nscolor backColor = *customColors->mBackgroundColor;
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int32_t luminosityDifference =
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NS_LUMINOSITY_DIFFERENCE(foreColor, backColor);
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if (mSufficientContrast > luminosityDifference &&
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customColors->mAltBackgroundColor) {
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int32_t altLuminosityDifference = NS_LUMINOSITY_DIFFERENCE(
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foreColor, *customColors->mAltBackgroundColor);
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if (luminosityDifference < altLuminosityDifference) {
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backColor = *customColors->mAltBackgroundColor;
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}
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}
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*aForeColor = foreColor;
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*aBackColor = backColor;
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return;
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}
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if (customColors->mForegroundColor) {
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nscolor foreColor = *customColors->mForegroundColor;
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// !mBackgroundColor means "transparent"; the current color of the
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// background.
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int32_t luminosityDifference =
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NS_LUMINOSITY_DIFFERENCE(foreColor, mFrameBackgroundColor);
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if (mSufficientContrast > luminosityDifference &&
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customColors->mAltForegroundColor) {
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int32_t altLuminosityDifference = NS_LUMINOSITY_DIFFERENCE(
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*customColors->mForegroundColor, mFrameBackgroundColor);
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if (luminosityDifference < altLuminosityDifference) {
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foreColor = *customColors->mAltForegroundColor;
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}
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}
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*aForeColor = foreColor;
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*aBackColor = NS_TRANSPARENT;
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return;
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}
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// There are neither mForegroundColor nor mBackgroundColor.
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*aForeColor = GetTextColor();
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*aBackColor = NS_TRANSPARENT;
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}
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bool nsTextPaintStyle::GetCustomHighlightTextColor(nsAtom* aHighlightName,
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nscolor* aForeColor) {
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NS_ASSERTION(aForeColor, "aForeColor is null");
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// non-existing highlights will be stored as `aHighlightName->nullptr`,
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// so subsequent calls only need a hashtable lookup and don't have
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// to enter the style engine.
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RefPtr<ComputedStyle> highlightStyle =
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mCustomHighlightPseudoStyles.LookupOrInsertWith(
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aHighlightName, [this, &aHighlightName] {
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return mFrame->ComputeHighlightSelectionStyle(aHighlightName);
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});
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if (!highlightStyle) {
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// highlight `aHighlightName` doesn't exist or has no style rules.
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return false;
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}
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*aForeColor = highlightStyle->GetVisitedDependentColor(
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&nsStyleText::mWebkitTextFillColor);
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return highlightStyle->HasAuthorSpecifiedTextColor();
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}
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bool nsTextPaintStyle::GetCustomHighlightBackgroundColor(nsAtom* aHighlightName,
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nscolor* aBackColor) {
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NS_ASSERTION(aBackColor, "aBackColor is null");
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// non-existing highlights will be stored as `aHighlightName->nullptr`,
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// so subsequent calls only need a hashtable lookup and don't have
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// to enter the style engine.
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RefPtr<ComputedStyle> highlightStyle =
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mCustomHighlightPseudoStyles.LookupOrInsertWith(
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aHighlightName, [this, &aHighlightName] {
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return mFrame->ComputeHighlightSelectionStyle(aHighlightName);
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});
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if (!highlightStyle) {
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// highlight `aHighlightName` doesn't exist or has no style rules.
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return false;
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}
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*aBackColor = highlightStyle->GetVisitedDependentColor(
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&nsStyleBackground::mBackgroundColor);
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return NS_GET_A(*aBackColor) != 0;
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}
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void nsTextPaintStyle::GetURLSecondaryColor(nscolor* aForeColor) {
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NS_ASSERTION(aForeColor, "aForeColor is null");
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const nscolor textColor = GetTextColor();
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*aForeColor = NS_RGBA(NS_GET_R(textColor), NS_GET_G(textColor),
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NS_GET_B(textColor), 127);
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}
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void nsTextPaintStyle::GetIMESelectionColors(int32_t aIndex,
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nscolor* aForeColor,
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nscolor* aBackColor) {
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NS_ASSERTION(aForeColor, "aForeColor is null");
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NS_ASSERTION(aBackColor, "aBackColor is null");
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NS_ASSERTION(aIndex >= 0 && aIndex < 5, "Index out of range");
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nsSelectionStyle* selectionStyle = GetSelectionStyle(aIndex);
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*aForeColor = selectionStyle->mTextColor;
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*aBackColor = selectionStyle->mBGColor;
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}
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bool nsTextPaintStyle::GetSelectionUnderlineForPaint(
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int32_t aIndex, nscolor* aLineColor, float* aRelativeSize,
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StyleTextDecorationStyle* aStyle) {
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NS_ASSERTION(aLineColor, "aLineColor is null");
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NS_ASSERTION(aRelativeSize, "aRelativeSize is null");
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NS_ASSERTION(aIndex >= 0 && aIndex < 5, "Index out of range");
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nsSelectionStyle* selectionStyle = GetSelectionStyle(aIndex);
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if (selectionStyle->mUnderlineStyle == StyleTextDecorationStyle::None ||
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selectionStyle->mUnderlineColor == NS_TRANSPARENT ||
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selectionStyle->mUnderlineRelativeSize <= 0.0f)
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return false;
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*aLineColor = selectionStyle->mUnderlineColor;
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*aRelativeSize = selectionStyle->mUnderlineRelativeSize;
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*aStyle = selectionStyle->mUnderlineStyle;
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return true;
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}
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void nsTextPaintStyle::InitCommonColors() {
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if (mInitCommonColors) {
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return;
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}
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auto bgColor = nsCSSRendering::FindEffectiveBackgroundColor(mFrame);
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mFrameBackgroundColor = bgColor.mColor;
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mSystemFieldForegroundColor =
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LookAndFeel::Color(LookAndFeel::ColorID::Fieldtext, mFrame);
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mSystemFieldBackgroundColor =
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LookAndFeel::Color(LookAndFeel::ColorID::Field, mFrame);
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if (bgColor.mIsThemed) {
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// Assume a native widget has sufficient contrast always
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mSufficientContrast = 0;
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mInitCommonColors = true;
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return;
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}
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nscolor defaultWindowBackgroundColor =
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LookAndFeel::Color(LookAndFeel::ColorID::Window, mFrame);
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nscolor selectionTextColor =
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LookAndFeel::Color(LookAndFeel::ColorID::Highlighttext, mFrame);
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nscolor selectionBGColor =
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LookAndFeel::Color(LookAndFeel::ColorID::Highlight, mFrame);
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mSufficientContrast = std::min(
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std::min(NS_SUFFICIENT_LUMINOSITY_DIFFERENCE,
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NS_LUMINOSITY_DIFFERENCE(selectionTextColor, selectionBGColor)),
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NS_LUMINOSITY_DIFFERENCE(defaultWindowBackgroundColor, selectionBGColor));
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mInitCommonColors = true;
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}
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nscolor nsTextPaintStyle::GetSystemFieldForegroundColor() {
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InitCommonColors();
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return mSystemFieldForegroundColor;
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}
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nscolor nsTextPaintStyle::GetSystemFieldBackgroundColor() {
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InitCommonColors();
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return mSystemFieldBackgroundColor;
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}
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bool nsTextPaintStyle::InitSelectionColorsAndShadow() {
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if (mInitSelectionColorsAndShadow) {
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return true;
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}
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int16_t selectionFlags;
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const int16_t selectionStatus = mFrame->GetSelectionStatus(&selectionFlags);
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if (!(selectionFlags & nsISelectionDisplay::DISPLAY_TEXT) ||
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selectionStatus < nsISelectionController::SELECTION_ON) {
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// Not displaying the normal selection.
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// We're not caching this fact, so every call to GetSelectionColors
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// will come through here. We could avoid this, but it's not really worth
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// it.
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return false;
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}
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mInitSelectionColorsAndShadow = true;
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// Use ::selection pseudo class if applicable.
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if (RefPtr<ComputedStyle> style =
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mFrame->ComputeSelectionStyle(selectionStatus)) {
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mSelectionBGColor =
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style->GetVisitedDependentColor(&nsStyleBackground::mBackgroundColor);
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mSelectionTextColor =
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style->GetVisitedDependentColor(&nsStyleText::mWebkitTextFillColor);
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mSelectionPseudoStyle = std::move(style);
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return true;
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}
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mSelectionTextColor =
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LookAndFeel::Color(LookAndFeel::ColorID::Highlighttext, mFrame);
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nscolor selectionBGColor =
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LookAndFeel::Color(LookAndFeel::ColorID::Highlight, mFrame);
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switch (selectionStatus) {
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case nsISelectionController::SELECTION_ATTENTION: {
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mSelectionTextColor = LookAndFeel::Color(
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LookAndFeel::ColorID::TextSelectAttentionForeground, mFrame);
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mSelectionBGColor = LookAndFeel::Color(
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LookAndFeel::ColorID::TextSelectAttentionBackground, mFrame);
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mSelectionBGColor =
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EnsureDifferentColors(mSelectionBGColor, selectionBGColor);
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break;
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}
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case nsISelectionController::SELECTION_ON: {
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mSelectionBGColor = selectionBGColor;
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break;
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}
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default: {
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mSelectionBGColor = LookAndFeel::Color(
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LookAndFeel::ColorID::TextSelectDisabledBackground, mFrame);
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mSelectionBGColor =
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EnsureDifferentColors(mSelectionBGColor, selectionBGColor);
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break;
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}
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}
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if (mResolveColors) {
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EnsureSufficientContrast(&mSelectionTextColor, &mSelectionBGColor);
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}
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return true;
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}
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nsTextPaintStyle::nsSelectionStyle* nsTextPaintStyle::GetSelectionStyle(
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int32_t aIndex) {
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InitSelectionStyle(aIndex);
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return &mSelectionStyle[aIndex];
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}
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struct StyleIDs {
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LookAndFeel::ColorID mForeground, mBackground, mLine;
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LookAndFeel::IntID mLineStyle;
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LookAndFeel::FloatID mLineRelativeSize;
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};
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static StyleIDs SelectionStyleIDs[] = {
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{LookAndFeel::ColorID::IMERawInputForeground,
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LookAndFeel::ColorID::IMERawInputBackground,
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LookAndFeel::ColorID::IMERawInputUnderline,
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LookAndFeel::IntID::IMERawInputUnderlineStyle,
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LookAndFeel::FloatID::IMEUnderlineRelativeSize},
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{LookAndFeel::ColorID::IMESelectedRawTextForeground,
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LookAndFeel::ColorID::IMESelectedRawTextBackground,
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LookAndFeel::ColorID::IMESelectedRawTextUnderline,
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LookAndFeel::IntID::IMESelectedRawTextUnderlineStyle,
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LookAndFeel::FloatID::IMEUnderlineRelativeSize},
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{LookAndFeel::ColorID::IMEConvertedTextForeground,
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LookAndFeel::ColorID::IMEConvertedTextBackground,
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LookAndFeel::ColorID::IMEConvertedTextUnderline,
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LookAndFeel::IntID::IMEConvertedTextUnderlineStyle,
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LookAndFeel::FloatID::IMEUnderlineRelativeSize},
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{LookAndFeel::ColorID::IMESelectedConvertedTextForeground,
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LookAndFeel::ColorID::IMESelectedConvertedTextBackground,
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LookAndFeel::ColorID::IMESelectedConvertedTextUnderline,
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LookAndFeel::IntID::IMESelectedConvertedTextUnderline,
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LookAndFeel::FloatID::IMEUnderlineRelativeSize},
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{LookAndFeel::ColorID::End, LookAndFeel::ColorID::End,
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LookAndFeel::ColorID::SpellCheckerUnderline,
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LookAndFeel::IntID::SpellCheckerUnderlineStyle,
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LookAndFeel::FloatID::SpellCheckerUnderlineRelativeSize}};
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void nsTextPaintStyle::InitSelectionStyle(int32_t aIndex) {
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NS_ASSERTION(aIndex >= 0 && aIndex < 5, "aIndex is invalid");
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nsSelectionStyle* selectionStyle = &mSelectionStyle[aIndex];
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if (selectionStyle->mInit) {
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return;
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}
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StyleIDs* styleIDs = &SelectionStyleIDs[aIndex];
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nscolor foreColor, backColor;
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if (styleIDs->mForeground == LookAndFeel::ColorID::End) {
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foreColor = NS_SAME_AS_FOREGROUND_COLOR;
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} else {
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foreColor = LookAndFeel::Color(styleIDs->mForeground, mFrame);
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}
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if (styleIDs->mBackground == LookAndFeel::ColorID::End) {
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backColor = NS_TRANSPARENT;
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} else {
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backColor = LookAndFeel::Color(styleIDs->mBackground, mFrame);
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}
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// Convert special color to actual color
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NS_ASSERTION(foreColor != NS_TRANSPARENT,
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"foreColor cannot be NS_TRANSPARENT");
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NS_ASSERTION(backColor != NS_SAME_AS_FOREGROUND_COLOR,
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"backColor cannot be NS_SAME_AS_FOREGROUND_COLOR");
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NS_ASSERTION(backColor != NS_40PERCENT_FOREGROUND_COLOR,
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"backColor cannot be NS_40PERCENT_FOREGROUND_COLOR");
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|
if (mResolveColors) {
|
|
foreColor = GetResolvedForeColor(foreColor, GetTextColor(), backColor);
|
|
|
|
if (NS_GET_A(backColor) > 0) {
|
|
EnsureSufficientContrast(&foreColor, &backColor);
|
|
}
|
|
}
|
|
|
|
nscolor lineColor;
|
|
float relativeSize;
|
|
StyleTextDecorationStyle lineStyle;
|
|
GetSelectionUnderline(mFrame, aIndex, &lineColor, &relativeSize, &lineStyle);
|
|
|
|
if (mResolveColors) {
|
|
lineColor = GetResolvedForeColor(lineColor, foreColor, backColor);
|
|
}
|
|
|
|
selectionStyle->mTextColor = foreColor;
|
|
selectionStyle->mBGColor = backColor;
|
|
selectionStyle->mUnderlineColor = lineColor;
|
|
selectionStyle->mUnderlineStyle = lineStyle;
|
|
selectionStyle->mUnderlineRelativeSize = relativeSize;
|
|
selectionStyle->mInit = true;
|
|
}
|
|
|
|
/* static */
|
|
bool nsTextPaintStyle::GetSelectionUnderline(nsIFrame* aFrame, int32_t aIndex,
|
|
nscolor* aLineColor,
|
|
float* aRelativeSize,
|
|
StyleTextDecorationStyle* aStyle) {
|
|
NS_ASSERTION(aFrame, "aFrame is null");
|
|
NS_ASSERTION(aRelativeSize, "aRelativeSize is null");
|
|
NS_ASSERTION(aStyle, "aStyle is null");
|
|
NS_ASSERTION(aIndex >= 0 && aIndex < 5, "Index out of range");
|
|
|
|
StyleIDs& styleID = SelectionStyleIDs[aIndex];
|
|
|
|
nscolor color = LookAndFeel::Color(styleID.mLine, aFrame);
|
|
const int32_t lineStyle = LookAndFeel::GetInt(styleID.mLineStyle);
|
|
auto style = static_cast<StyleTextDecorationStyle>(lineStyle);
|
|
if (lineStyle > static_cast<int32_t>(StyleTextDecorationStyle::Sentinel)) {
|
|
NS_ERROR("Invalid underline style value is specified");
|
|
style = StyleTextDecorationStyle::Solid;
|
|
}
|
|
float size = LookAndFeel::GetFloat(styleID.mLineRelativeSize);
|
|
|
|
NS_ASSERTION(size, "selection underline relative size must be larger than 0");
|
|
|
|
if (aLineColor) {
|
|
*aLineColor = color;
|
|
}
|
|
*aRelativeSize = size;
|
|
*aStyle = style;
|
|
|
|
return style != StyleTextDecorationStyle::None && color != NS_TRANSPARENT &&
|
|
size > 0.0f;
|
|
}
|
|
|
|
bool nsTextPaintStyle::GetSelectionShadow(
|
|
Span<const StyleSimpleShadow>* aShadows) {
|
|
if (!InitSelectionColorsAndShadow()) {
|
|
return false;
|
|
}
|
|
|
|
if (mSelectionPseudoStyle) {
|
|
*aShadows = mSelectionPseudoStyle->StyleText()->mTextShadow.AsSpan();
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
inline nscolor Get40PercentColor(nscolor aForeColor, nscolor aBackColor) {
|
|
nscolor foreColor = NS_RGBA(NS_GET_R(aForeColor), NS_GET_G(aForeColor),
|
|
NS_GET_B(aForeColor), (uint8_t)(255 * 0.4f));
|
|
// Don't use true alpha color for readability.
|
|
return NS_ComposeColors(aBackColor, foreColor);
|
|
}
|
|
|
|
nscolor nsTextPaintStyle::GetResolvedForeColor(nscolor aColor,
|
|
nscolor aDefaultForeColor,
|
|
nscolor aBackColor) {
|
|
if (aColor == NS_SAME_AS_FOREGROUND_COLOR) {
|
|
return aDefaultForeColor;
|
|
}
|
|
|
|
if (aColor != NS_40PERCENT_FOREGROUND_COLOR) {
|
|
return aColor;
|
|
}
|
|
|
|
// Get actual background color
|
|
nscolor actualBGColor = aBackColor;
|
|
if (actualBGColor == NS_TRANSPARENT) {
|
|
InitCommonColors();
|
|
actualBGColor = mFrameBackgroundColor;
|
|
}
|
|
return Get40PercentColor(aDefaultForeColor, actualBGColor);
|
|
}
|
|
|
|
nscolor nsTextPaintStyle::GetWebkitTextStrokeColor() {
|
|
if (mFrame->IsInSVGTextSubtree()) {
|
|
return 0;
|
|
}
|
|
return mFrame->StyleText()->mWebkitTextStrokeColor.CalcColor(mFrame);
|
|
}
|
|
|
|
float nsTextPaintStyle::GetWebkitTextStrokeWidth() {
|
|
if (mFrame->IsInSVGTextSubtree()) {
|
|
return 0.0f;
|
|
}
|
|
nscoord coord = mFrame->StyleText()->mWebkitTextStrokeWidth;
|
|
return mFrame->PresContext()->AppUnitsToFloatDevPixels(coord);
|
|
}
|