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/*
* (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004-2017 Apple Inc. All rights reserved.
* Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
#include "AffineTransform.h"
#include "FloatRect.h"
#include "GlyphDisplayListCache.h"
#include "RotationDirection.h"
#include "TextFlags.h"
#include "TextPaintStyle.h"
#include <wtf/text/AtomString.h>
namespace WebCore {
class FilterOperations;
class FontCascade;
class RenderCombineText;
class TextRun;
class Text;
struct TextPaintStyle;
namespace Style {
struct TextShadow;
template<typename> struct Shadows;
using TextShadows = Shadows<TextShadow>;
}
static inline AffineTransform rotation(const FloatRect& boxRect, RotationDirection direction)
{
return direction == RotationDirection::Clockwise
? AffineTransform(0, 1, -1, 0, boxRect.x() + boxRect.maxY(), boxRect.maxY() - boxRect.x())
: AffineTransform(0, -1, 1, 0, boxRect.x() - boxRect.maxY(), boxRect.x() + boxRect.maxY());
}
class TextPainter {
public:
TextPainter(GraphicsContext&, const FontCascade&, const RenderStyle&, const TextPaintStyle&, const Style::TextShadows&, const FilterOperations*, const AtomString& emphasisMark, float emphasisMarkOffset, const RenderCombineText*);
void paintRange(const TextRun&, const FloatRect& boxRect, const FloatPoint& textOrigin, unsigned start, unsigned end);
template<typename LayoutRun>
void setGlyphDisplayListIfNeeded(const LayoutRun& run, const PaintInfo& paintInfo, const RenderStyle& style, const TextRun& textRun)
{
if (!TextPainter::shouldUseGlyphDisplayList(paintInfo, style))
const_cast<LayoutRun&>(run).removeFromGlyphDisplayListCache();
else
m_glyphDisplayList = GlyphDisplayListCache::singleton().get(run, m_font, m_context, textRun, paintInfo);
}
static bool shouldUseGlyphDisplayList(const PaintInfo&, const RenderStyle&);
WEBCORE_EXPORT static void setForceUseGlyphDisplayListForTesting(bool);
WEBCORE_EXPORT static String cachedGlyphDisplayListsForTextNodeAsText(Text&, OptionSet<DisplayList::AsTextFlag>);
WEBCORE_EXPORT static void clearGlyphDisplayListCacheForTesting();
private:
template<typename LayoutRun>
static RefPtr<const DisplayList::DisplayList> glyphDisplayListIfExists(const LayoutRun& run)
{
return GlyphDisplayListCache::singleton().getIfExists(run);
}
void paintTextOrEmphasisMarks(const FontCascade&, const TextRun&, const AtomString& emphasisMark, float emphasisMarkOffset,
const FloatPoint& textOrigin, unsigned startOffset, unsigned endOffset);
void paintTextWithShadows(const Style::TextShadows*, const FilterOperations*, const FontCascade&, const TextRun&, const FloatRect& boxRect, const FloatPoint& textOrigin,
unsigned startOffset, unsigned endOffset, const AtomString& emphasisMark, float emphasisMarkOffset, bool stroked);
void paintTextAndEmphasisMarksIfNeeded(const TextRun&, const FloatRect& boxRect, const FloatPoint& textOrigin, unsigned startOffset, unsigned endOffset,
const TextPaintStyle&, const Style::TextShadows&, const FilterOperations*);
GraphicsContext& m_context;
const CheckedRef<const FontCascade> m_font;
const CheckedRef<const RenderStyle> m_renderStyle;
TextPaintStyle m_style;
AtomString m_emphasisMark;
const Style::TextShadows& m_shadow;
const FilterOperations* m_shadowColorFilter { nullptr };
const CheckedPtr<const RenderCombineText> m_combinedText;
RefPtr<const DisplayList::DisplayList> m_glyphDisplayList { nullptr };
float m_emphasisMarkOffset { 0 };
WritingMode m_writingMode;
};
class ShadowApplier {
public:
ShadowApplier(const RenderStyle&, GraphicsContext&, const Style::TextShadow*, const FilterOperations* colorFilter, const FloatRect& textRect, bool isLastShadowIteration, bool lastShadowIterationShouldDrawText = true, bool opaque = false, bool ignoreWritingMode = false);
FloatSize extraOffset() const { return m_extraOffset; }
bool nothingToDraw() const { return m_nothingToDraw; }
bool didSaveContext() const { return m_didSaveContext; }
~ShadowApplier();
private:
bool isLastShadowIteration();
bool shadowIsCompletelyCoveredByText(bool textIsOpaque);
FloatSize m_extraOffset;
GraphicsContext& m_context;
const Style::TextShadow* m_shadow;
bool m_onlyDrawsShadow : 1;
bool m_avoidDrawingShadow : 1;
bool m_nothingToDraw : 1;
bool m_didSaveContext : 1;
};
} // namespace WebCore
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