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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.
*
* 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.
*
*/
#include "config.h"
#include "TextPainter.h"
#include "GraphicsContext.h"
#include "InlineTextBox.h"
#include "RenderCombineText.h"
#include "ShadowData.h"
#include <wtf/NeverDestroyed.h>
namespace WebCore {
ShadowApplier::ShadowApplier(GraphicsContext& context, const ShadowData* shadow, const FloatRect& textRect, bool lastShadowIterationShouldDrawText, bool opaque, FontOrientation orientation)
: m_context { context }
, m_shadow { shadow }
, m_onlyDrawsShadow { !isLastShadowIteration() || !lastShadowIterationShouldDrawText }
, m_avoidDrawingShadow { shadowIsCompletelyCoveredByText(opaque) }
, m_nothingToDraw { shadow && m_avoidDrawingShadow && m_onlyDrawsShadow }
, m_didSaveContext { false }
{
if (!shadow || m_nothingToDraw) {
m_shadow = nullptr;
return;
}
int shadowX = orientation == Horizontal ? shadow->x() : shadow->y();
int shadowY = orientation == Horizontal ? shadow->y() : -shadow->x();
FloatSize shadowOffset(shadowX, shadowY);
int shadowRadius = shadow->radius();
const Color& shadowColor = shadow->color();
// When drawing shadows, we usually clip the context to the area the shadow will reside, and then
// draw the text itself outside the clipped area (so only the shadow shows up). However, we can
// often draw the *last* shadow and the text itself in a single call.
if (m_onlyDrawsShadow) {
FloatRect shadowRect(textRect);
shadowRect.inflate(shadow->paintingExtent() + 3 * textRect.height());
shadowRect.move(shadowOffset);
context.save();
context.clip(shadowRect);
m_didSaveContext = true;
m_extraOffset = FloatSize(0, 2 * shadowRect.height() + std::max(0.0f, shadowOffset.height()) + shadowRadius);
shadowOffset -= m_extraOffset;
}
if (!m_avoidDrawingShadow)
context.setShadow(shadowOffset, shadowRadius, shadowColor);
}
inline bool ShadowApplier::isLastShadowIteration()
{
return m_shadow && !m_shadow->next();
}
inline bool ShadowApplier::shadowIsCompletelyCoveredByText(bool textIsOpaque)
{
return textIsOpaque && m_shadow && m_shadow->location().isZero() && !m_shadow->radius();
}
ShadowApplier::~ShadowApplier()
{
if (!m_shadow)
return;
if (m_onlyDrawsShadow)
m_context.restore();
else if (!m_avoidDrawingShadow)
m_context.clearShadow();
}
TextPainter::TextPainter(GraphicsContext& context)
: m_context(context)
{
}
void TextPainter::paintTextOrEmphasisMarks(const FontCascade& font, const TextRun& textRun, const AtomicString& emphasisMark,
float emphasisMarkOffset, const FloatPoint& textOrigin, unsigned startOffset, unsigned endOffset)
{
ASSERT(startOffset < endOffset);
if (emphasisMark.isEmpty())
m_context.drawText(font, textRun, textOrigin, startOffset, endOffset);
else
m_context.drawEmphasisMarks(font, textRun, emphasisMark, textOrigin + FloatSize(0, emphasisMarkOffset), startOffset, endOffset);
}
void TextPainter::paintTextWithShadows(const ShadowData* shadow, const FontCascade& font, const TextRun& textRun, const FloatRect& boxRect, const FloatPoint& textOrigin,
unsigned startOffset, unsigned endOffset, const AtomicString& emphasisMark, float emphasisMarkOffset, bool stroked)
{
if (!shadow) {
paintTextOrEmphasisMarks(font, textRun, emphasisMark, emphasisMarkOffset, textOrigin, startOffset, endOffset);
return;
}
Color fillColor = m_context.fillColor();
bool opaque = fillColor.isOpaque();
bool lastShadowIterationShouldDrawText = !stroked && opaque;
if (!opaque)
m_context.setFillColor(Color::black);
while (shadow) {
ShadowApplier shadowApplier(m_context, shadow, boxRect, lastShadowIterationShouldDrawText, opaque, m_textBoxIsHorizontal ? Horizontal : Vertical);
if (!shadowApplier.nothingToDraw())
paintTextOrEmphasisMarks(font, textRun, emphasisMark, emphasisMarkOffset, textOrigin + shadowApplier.extraOffset(), startOffset, endOffset);
shadow = shadow->next();
}
if (!lastShadowIterationShouldDrawText) {
if (!opaque)
m_context.setFillColor(fillColor);
paintTextOrEmphasisMarks(font, textRun, emphasisMark, emphasisMarkOffset, textOrigin, startOffset, endOffset);
}
}
void TextPainter::paintTextAndEmphasisMarksIfNeeded(const TextRun& textRun, const FloatRect& boxRect, const FloatPoint& textOrigin, unsigned startOffset, unsigned endOffset,
const TextPaintStyle& paintStyle, const ShadowData* shadow)
{
if (paintStyle.paintOrder == PaintOrder::Normal) {
// FIXME: Truncate right-to-left text correctly.
paintTextWithShadows(shadow, *m_font, textRun, boxRect, textOrigin, startOffset, endOffset, nullAtom(), 0, paintStyle.strokeWidth > 0);
} else {
bool paintShadow = true;
auto textDrawingMode = m_context.textDrawingMode();
auto paintOrder = RenderStyle::paintTypesForPaintOrder(paintStyle.paintOrder);
for (auto order : paintOrder) {
switch (order) {
case PaintType::Fill:
m_context.setTextDrawingMode(textDrawingMode & ~TextModeStroke);
paintTextWithShadows(paintShadow ? shadow : nullptr, *m_font, textRun, boxRect, textOrigin, startOffset, endOffset, nullAtom(), 0, false);
paintShadow = false;
m_context.setTextDrawingMode(textDrawingMode);
break;
case PaintType::Stroke:
m_context.setTextDrawingMode(textDrawingMode & ~TextModeFill);
paintTextWithShadows(paintShadow ? shadow : nullptr, *m_font, textRun, boxRect, textOrigin, startOffset, endOffset, nullAtom(), 0, paintStyle.strokeWidth > 0);
paintShadow = false;
m_context.setTextDrawingMode(textDrawingMode);
break;
case PaintType::Markers:
continue;
}
}
}
if (m_emphasisMark.isEmpty())
return;
FloatPoint boxOrigin = boxRect.location();
updateGraphicsContext(m_context, paintStyle, UseEmphasisMarkColor);
static NeverDestroyed<TextRun> objectReplacementCharacterTextRun(StringView(&objectReplacementCharacter, 1));
const TextRun& emphasisMarkTextRun = m_combinedText ? objectReplacementCharacterTextRun.get() : textRun;
FloatPoint emphasisMarkTextOrigin = m_combinedText ? FloatPoint(boxOrigin.x() + boxRect.width() / 2, boxOrigin.y() + m_font->fontMetrics().ascent()) : textOrigin;
if (m_combinedText)
m_context.concatCTM(rotation(boxRect, Clockwise));
// FIXME: Truncate right-to-left text correctly.
paintTextWithShadows(shadow, m_combinedText ? m_combinedText->originalFont() : *m_font, emphasisMarkTextRun, boxRect, emphasisMarkTextOrigin, startOffset, endOffset,
m_emphasisMark, m_emphasisMarkOffset, paintStyle.strokeWidth > 0);
if (m_combinedText)
m_context.concatCTM(rotation(boxRect, Counterclockwise));
}
void TextPainter::paintRange(const TextRun& textRun, const FloatRect& boxRect, const FloatPoint& textOrigin, unsigned start, unsigned end)
{
ASSERT(m_font);
ASSERT(start < end);
GraphicsContextStateSaver stateSaver(m_context, m_style.strokeWidth > 0);
updateGraphicsContext(m_context, m_style);
paintTextAndEmphasisMarksIfNeeded(textRun, boxRect, textOrigin, start, end, m_style, m_shadow);
}
void TextPainter::paint(const TextRun& textRun, unsigned length, const FloatRect& boxRect, const FloatPoint& textOrigin, unsigned selectionStart, unsigned selectionEnd,
bool paintSelectedTextOnly, bool paintSelectedTextSeparately, bool paintNonSelectedTextOnly)
{
ASSERT(m_font);
if (!paintSelectedTextOnly) {
// For stroked painting, we have to change the text drawing mode. It's probably dangerous to leave that mutated as a side
// effect, so only when we know we're stroking, do a save/restore.
GraphicsContextStateSaver stateSaver(m_context, m_style.strokeWidth > 0);
updateGraphicsContext(m_context, m_style);
bool fullPaint = !paintSelectedTextSeparately || selectionEnd <= selectionStart;
if (fullPaint)
paintTextAndEmphasisMarksIfNeeded(textRun, boxRect, textOrigin, 0, length, m_style, m_shadow);
else {
// Paint the before and after selection parts.
if (selectionStart > 0)
paintTextAndEmphasisMarksIfNeeded(textRun, boxRect, textOrigin, 0, selectionStart, m_style, m_shadow);
if (selectionEnd < length)
paintTextAndEmphasisMarksIfNeeded(textRun, boxRect, textOrigin, selectionEnd, length, m_style, m_shadow);
}
}
if (paintNonSelectedTextOnly)
return;
// Paint only the text that is selected.
if ((paintSelectedTextOnly || paintSelectedTextSeparately) && selectionStart < selectionEnd) {
GraphicsContextStateSaver stateSaver(m_context, m_selectionStyle.strokeWidth > 0);
updateGraphicsContext(m_context, m_selectionStyle);
paintTextAndEmphasisMarksIfNeeded(textRun, boxRect, textOrigin, selectionStart, selectionEnd, m_selectionStyle, m_selectionShadow);
}
}
} // namespace WebCore
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