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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "core/paint/TextPainter.h"
#include "core/CSSPropertyNames.h"
#include "core/frame/Settings.h"
#include "core/rendering/InlineTextBox.h"
#include "core/rendering/RenderCombineText.h"
#include "core/rendering/RenderObject.h"
#include "core/rendering/style/RenderStyle.h"
#include "core/rendering/style/ShadowList.h"
#include "platform/fonts/Font.h"
#include "platform/graphics/GraphicsContext.h"
#include "platform/graphics/GraphicsContextStateSaver.h"
#include "platform/text/TextRun.h"
#include "wtf/Assertions.h"
#include "wtf/unicode/CharacterNames.h"
namespace blink {
TextPainter::TextPainter(GraphicsContext* context, const Font& font, const TextRun& run, const FloatPoint& textOrigin, const FloatRect& textBounds, bool horizontal)
: m_graphicsContext(context)
, m_font(font)
, m_run(run)
, m_textOrigin(textOrigin)
, m_textBounds(textBounds)
, m_horizontal(horizontal)
, m_emphasisMarkOffset(0)
, m_combinedText(0)
{
}
TextPainter::~TextPainter()
{
}
void TextPainter::setEmphasisMark(const AtomicString& emphasisMark, TextEmphasisPosition position)
{
m_emphasisMark = emphasisMark;
if (emphasisMark.isNull()) {
m_emphasisMarkOffset = 0;
} else if (position == TextEmphasisPositionOver) {
m_emphasisMarkOffset = -m_font.fontMetrics().ascent() - m_font.emphasisMarkDescent(emphasisMark);
} else {
ASSERT(position == TextEmphasisPositionUnder);
m_emphasisMarkOffset = m_font.fontMetrics().descent() + m_font.emphasisMarkAscent(emphasisMark);
}
}
void TextPainter::paint(int startOffset, int endOffset, int length, const Style& textStyle, TextBlobPtr* cachedTextBlob)
{
GraphicsContextStateSaver stateSaver(*m_graphicsContext, false);
updateGraphicsContext(textStyle, stateSaver);
paintInternal<PaintText>(startOffset, endOffset, length, cachedTextBlob);
if (!m_emphasisMark.isEmpty()) {
if (textStyle.emphasisMarkColor != textStyle.fillColor)
m_graphicsContext->setFillColor(textStyle.emphasisMarkColor);
if (m_combinedText)
paintEmphasisMarkForCombinedText();
else
paintInternal<PaintEmphasisMark>(startOffset, endOffset, length);
}
}
// static
void TextPainter::updateGraphicsContext(GraphicsContext* context, const Style& textStyle, bool horizontal, GraphicsContextStateSaver& stateSaver)
{
TextDrawingModeFlags mode = context->textDrawingMode();
if (textStyle.strokeWidth > 0) {
TextDrawingModeFlags newMode = mode | TextModeStroke;
if (mode != newMode) {
if (!stateSaver.saved())
stateSaver.save();
context->setTextDrawingMode(newMode);
mode = newMode;
}
}
if (mode & TextModeFill && textStyle.fillColor != context->fillColor())
context->setFillColor(textStyle.fillColor);
if (mode & TextModeStroke) {
if (textStyle.strokeColor != context->strokeColor())
context->setStrokeColor(textStyle.strokeColor);
if (textStyle.strokeWidth != context->strokeThickness())
context->setStrokeThickness(textStyle.strokeWidth);
}
// Text shadows are disabled when printing. http://crbug.com/258321
if (textStyle.shadow && !context->printing()) {
if (!stateSaver.saved())
stateSaver.save();
context->setDrawLooper(textStyle.shadow->createDrawLooper(DrawLooperBuilder::ShadowIgnoresAlpha, horizontal));
}
}
static Color textColorForWhiteBackground(Color textColor)
{
int distanceFromWhite = differenceSquared(textColor, Color::white);
// semi-arbitrarily chose 65025 (255^2) value here after a few tests;
return distanceFromWhite > 65025 ? textColor : textColor.dark();
}
// static
TextPainter::Style TextPainter::textPaintingStyle(RenderObject& renderer, RenderStyle* style, bool forceBlackText, bool isPrinting)
{
TextPainter::Style textStyle;
if (forceBlackText) {
textStyle.fillColor = Color::black;
textStyle.strokeColor = Color::black;
textStyle.emphasisMarkColor = Color::black;
textStyle.strokeWidth = style->textStrokeWidth();
textStyle.shadow = 0;
} else {
textStyle.fillColor = renderer.resolveColor(style, CSSPropertyWebkitTextFillColor);
textStyle.strokeColor = renderer.resolveColor(style, CSSPropertyWebkitTextStrokeColor);
textStyle.emphasisMarkColor = renderer.resolveColor(style, CSSPropertyWebkitTextEmphasisColor);
textStyle.strokeWidth = style->textStrokeWidth();
textStyle.shadow = style->textShadow();
// Adjust text color when printing with a white background.
bool forceBackgroundToWhite = false;
if (isPrinting) {
if (style->printColorAdjust() == PrintColorAdjustEconomy)
forceBackgroundToWhite = true;
if (renderer.document().settings() && renderer.document().settings()->shouldPrintBackgrounds())
forceBackgroundToWhite = false;
}
if (forceBackgroundToWhite) {
textStyle.fillColor = textColorForWhiteBackground(textStyle.fillColor);
textStyle.strokeColor = textColorForWhiteBackground(textStyle.strokeColor);
textStyle.emphasisMarkColor = textColorForWhiteBackground(textStyle.emphasisMarkColor);
}
// Text shadows are disabled when printing. http://crbug.com/258321
if (isPrinting)
textStyle.shadow = 0;
}
return textStyle;
}
TextPainter::Style TextPainter::selectionPaintingStyle(RenderObject& renderer, bool haveSelection, bool forceBlackText, bool isPrinting, const TextPainter::Style& textStyle)
{
TextPainter::Style selectionStyle = textStyle;
if (haveSelection) {
if (!forceBlackText) {
selectionStyle.fillColor = renderer.selectionForegroundColor();
selectionStyle.emphasisMarkColor = renderer.selectionEmphasisMarkColor();
}
if (RenderStyle* pseudoStyle = renderer.getCachedPseudoStyle(SELECTION)) {
selectionStyle.strokeColor = forceBlackText ? Color::black : renderer.resolveColor(pseudoStyle, CSSPropertyWebkitTextStrokeColor);
selectionStyle.strokeWidth = pseudoStyle->textStrokeWidth();
selectionStyle.shadow = forceBlackText ? 0 : pseudoStyle->textShadow();
}
// Text shadows are disabled when printing. http://crbug.com/258321
if (isPrinting)
selectionStyle.shadow = 0;
}
return selectionStyle;
}
template <TextPainter::PaintInternalStep step>
void TextPainter::paintInternalRun(TextRunPaintInfo& textRunPaintInfo, int from, int to)
{
ASSERT(from <= textRunPaintInfo.run.length());
ASSERT(to <= textRunPaintInfo.run.length());
textRunPaintInfo.from = from;
textRunPaintInfo.to = to;
if (step == PaintEmphasisMark) {
m_graphicsContext->drawEmphasisMarks(m_font, textRunPaintInfo, m_emphasisMark,
m_textOrigin + IntSize(0, m_emphasisMarkOffset));
} else {
ASSERT(step == PaintText);
m_graphicsContext->drawText(m_font, textRunPaintInfo, m_textOrigin);
}
}
template <TextPainter::PaintInternalStep Step>
void TextPainter::paintInternal(int startOffset, int endOffset, int truncationPoint, TextBlobPtr* cachedTextBlob)
{
TextRunPaintInfo textRunPaintInfo(m_run);
textRunPaintInfo.bounds = m_textBounds;
if (startOffset <= endOffset) {
// FIXME: We should be able to use cachedTextBlob in more cases.
textRunPaintInfo.cachedTextBlob = cachedTextBlob;
paintInternalRun<Step>(textRunPaintInfo, startOffset, endOffset);
} else {
if (endOffset > 0)
paintInternalRun<Step>(textRunPaintInfo, 0, endOffset);
if (startOffset < truncationPoint)
paintInternalRun<Step>(textRunPaintInfo, startOffset, truncationPoint);
}
}
void TextPainter::paintEmphasisMarkForCombinedText()
{
ASSERT(m_combinedText);
DEFINE_STATIC_LOCAL(TextRun, placeholderTextRun, (&ideographicFullStop, 1));
FloatPoint emphasisMarkTextOrigin(m_textBounds.x(), m_textBounds.y() + m_font.fontMetrics().ascent() + m_emphasisMarkOffset);
TextRunPaintInfo textRunPaintInfo(placeholderTextRun);
textRunPaintInfo.bounds = m_textBounds;
m_graphicsContext->concatCTM(rotation(m_textBounds, Clockwise));
m_graphicsContext->drawEmphasisMarks(m_combinedText->originalFont(), textRunPaintInfo, m_emphasisMark, emphasisMarkTextOrigin);
m_graphicsContext->concatCTM(rotation(m_textBounds, Counterclockwise));
}
} // namespace blink
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