217 lines
9.0 KiB
C++
217 lines
9.0 KiB
C++
/*
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* Copyright (C) 2013 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "TextPaintStyle.h"
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#include "ColorLuminance.h"
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#include "FocusController.h"
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#include "Frame.h"
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#include "GraphicsContext.h"
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#include "Page.h"
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#include "PaintInfo.h"
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#include "RenderStyle.h"
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#include "RenderText.h"
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#include "RenderTheme.h"
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#include "RenderView.h"
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#include "Settings.h"
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namespace WebCore {
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TextPaintStyle::TextPaintStyle(const Color& color)
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: fillColor(color)
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, strokeColor(color)
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{
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}
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bool TextPaintStyle::operator==(const TextPaintStyle& other) const
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{
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return fillColor == other.fillColor && strokeColor == other.strokeColor && emphasisMarkColor == other.emphasisMarkColor
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&& strokeWidth == other.strokeWidth && paintOrder == other.paintOrder && lineJoin == other.lineJoin
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#if ENABLE(LETTERPRESS)
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&& useLetterpressEffect == other.useLetterpressEffect
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#endif
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#if HAVE(OS_DARK_MODE_SUPPORT)
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&& useDarkAppearance == other.useDarkAppearance
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#endif
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&& lineCap == other.lineCap && miterLimit == other.miterLimit;
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}
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bool textColorIsLegibleAgainstBackgroundColor(const Color& textColor, const Color& backgroundColor)
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{
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// Uses the WCAG 2.0 definition of legibility: a contrast ratio of 4.5:1 or greater.
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// https://www.w3.org/TR/WCAG20/#visual-audio-contrast-contrast
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return contrastRatio(textColor, backgroundColor) >= 4.5;
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}
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static Color adjustColorForVisibilityOnBackground(const Color& textColor, const Color& backgroundColor)
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{
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if (textColorIsLegibleAgainstBackgroundColor(textColor, backgroundColor))
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return textColor;
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if (textColor.luminance() > 0.5)
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return textColor.darkened();
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return textColor.lightened();
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}
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TextPaintStyle computeTextPaintStyle(const Frame& frame, const RenderStyle& lineStyle, const PaintInfo& paintInfo)
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{
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TextPaintStyle paintStyle;
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#if ENABLE(LETTERPRESS)
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paintStyle.useLetterpressEffect = lineStyle.textDecorationsInEffect().contains(TextDecoration::Letterpress);
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#endif
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#if HAVE(OS_DARK_MODE_SUPPORT)
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paintStyle.useDarkAppearance = frame.document() ? frame.document()->useDarkAppearance(&lineStyle) : false;
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#endif
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auto viewportSize = frame.view() ? frame.view()->size() : IntSize();
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paintStyle.strokeWidth = lineStyle.computedStrokeWidth(viewportSize);
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paintStyle.paintOrder = lineStyle.paintOrder();
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paintStyle.lineJoin = lineStyle.joinStyle();
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paintStyle.lineCap = lineStyle.capStyle();
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paintStyle.miterLimit = lineStyle.strokeMiterLimit();
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if (paintInfo.forceTextColor()) {
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paintStyle.fillColor = paintInfo.forcedTextColor();
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paintStyle.strokeColor = paintInfo.forcedTextColor();
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paintStyle.emphasisMarkColor = paintInfo.forcedTextColor();
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return paintStyle;
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}
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if (lineStyle.insideDefaultButton()) {
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Page* page = frame.page();
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if (page && page->focusController().isActive()) {
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OptionSet<StyleColor::Options> options;
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if (page->useSystemAppearance())
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options.add(StyleColor::Options::UseSystemAppearance);
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paintStyle.fillColor = RenderTheme::singleton().defaultButtonTextColor(options);
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return paintStyle;
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}
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}
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paintStyle.fillColor = lineStyle.visitedDependentColorWithColorFilter(CSSPropertyWebkitTextFillColor);
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bool forceBackgroundToWhite = false;
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if (frame.document() && frame.document()->printing()) {
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if (lineStyle.printColorAdjust() == PrintColorAdjust::Economy)
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forceBackgroundToWhite = true;
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if (frame.settings().shouldPrintBackgrounds())
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forceBackgroundToWhite = false;
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}
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// Make the text fill color legible against a white background
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if (forceBackgroundToWhite)
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paintStyle.fillColor = adjustColorForVisibilityOnBackground(paintStyle.fillColor, Color::white);
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paintStyle.strokeColor = lineStyle.colorByApplyingColorFilter(lineStyle.computedStrokeColor());
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// Make the text stroke color legible against a white background
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if (forceBackgroundToWhite)
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paintStyle.strokeColor = adjustColorForVisibilityOnBackground(paintStyle.strokeColor, Color::white);
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paintStyle.emphasisMarkColor = lineStyle.visitedDependentColorWithColorFilter(CSSPropertyWebkitTextEmphasisColor);
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// Make the text stroke color legible against a white background
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if (forceBackgroundToWhite)
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paintStyle.emphasisMarkColor = adjustColorForVisibilityOnBackground(paintStyle.emphasisMarkColor, Color::white);
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return paintStyle;
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}
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TextPaintStyle computeTextSelectionPaintStyle(const TextPaintStyle& textPaintStyle, const RenderText& renderer, const RenderStyle& lineStyle, const PaintInfo& paintInfo, std::optional<ShadowData>& selectionShadow)
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{
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TextPaintStyle selectionPaintStyle = textPaintStyle;
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#if ENABLE(TEXT_SELECTION)
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Color foreground = paintInfo.forceTextColor() ? paintInfo.forcedTextColor() : renderer.selectionForegroundColor();
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if (foreground.isValid() && foreground != selectionPaintStyle.fillColor)
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selectionPaintStyle.fillColor = foreground;
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Color emphasisMarkForeground = paintInfo.forceTextColor() ? paintInfo.forcedTextColor() : renderer.selectionEmphasisMarkColor();
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if (emphasisMarkForeground.isValid() && emphasisMarkForeground != selectionPaintStyle.emphasisMarkColor)
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selectionPaintStyle.emphasisMarkColor = emphasisMarkForeground;
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if (auto pseudoStyle = renderer.selectionPseudoStyle()) {
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selectionShadow = ShadowData::clone(paintInfo.forceTextColor() ? nullptr : pseudoStyle->textShadow());
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auto viewportSize = renderer.frame().view() ? renderer.frame().view()->size() : IntSize();
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float strokeWidth = pseudoStyle->computedStrokeWidth(viewportSize);
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if (strokeWidth != selectionPaintStyle.strokeWidth)
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selectionPaintStyle.strokeWidth = strokeWidth;
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Color stroke = paintInfo.forceTextColor() ? paintInfo.forcedTextColor() : pseudoStyle->computedStrokeColor();
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if (stroke != selectionPaintStyle.strokeColor)
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selectionPaintStyle.strokeColor = stroke;
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} else
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selectionShadow = ShadowData::clone(paintInfo.forceTextColor() ? nullptr : lineStyle.textShadow());
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#else
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UNUSED_PARAM(renderer);
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UNUSED_PARAM(lineStyle);
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UNUSED_PARAM(paintInfo);
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selectionShadow = ShadowData::clone(paintInfo.forceTextColor() ? nullptr : lineStyle.textShadow());
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#endif
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return selectionPaintStyle;
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}
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void updateGraphicsContext(GraphicsContext& context, const TextPaintStyle& paintStyle, FillColorType fillColorType)
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{
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TextDrawingModeFlags mode = context.textDrawingMode();
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TextDrawingModeFlags newMode = mode;
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#if ENABLE(LETTERPRESS)
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if (paintStyle.useLetterpressEffect)
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newMode.add(TextDrawingMode::Letterpress);
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else
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newMode.remove(TextDrawingMode::Letterpress);
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#endif
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if (paintStyle.strokeWidth > 0 && paintStyle.strokeColor.isVisible())
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newMode.add(TextDrawingMode::Stroke);
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if (mode != newMode) {
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context.setTextDrawingMode(newMode);
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mode = newMode;
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}
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#if HAVE(OS_DARK_MODE_SUPPORT)
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context.setUseDarkAppearance(paintStyle.useDarkAppearance);
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#endif
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Color fillColor = fillColorType == UseEmphasisMarkColor ? paintStyle.emphasisMarkColor : paintStyle.fillColor;
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if (mode.contains(TextDrawingMode::Fill) && (fillColor != context.fillColor()))
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context.setFillColor(fillColor);
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if (mode & TextDrawingMode::Stroke) {
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if (paintStyle.strokeColor != context.strokeColor())
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context.setStrokeColor(paintStyle.strokeColor);
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if (paintStyle.strokeWidth != context.strokeThickness())
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context.setStrokeThickness(paintStyle.strokeWidth);
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context.setLineJoin(paintStyle.lineJoin);
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context.setLineCap(paintStyle.lineCap);
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if (paintStyle.lineJoin == MiterJoin)
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context.setMiterLimit(paintStyle.miterLimit);
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}
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}
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}
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