#include "config.h"
#include "Font.h"
#include "AffineTransform.h"
#include "FontDescription.h"
#include "FontFallbackList.h"
#include "FontSelector.h"
#include "GlyphBuffer.h"
#include "Gradient.h"
#include "GraphicsContext.h"
#include "NotImplemented.h"
#include "Pattern.h"
#include "ShadowBlur.h"
#include "TextRun.h"
#include <QBrush>
#include <QFontInfo>
#include <QFontMetrics>
#include <QPainter>
#include <QPainterPath>
#include <QPen>
#include <QTextLayout>
#include <limits.h>
#include <qalgorithms.h>
#include <qdebug.h>
namespace WebCore {
static const QString fromRawDataWithoutRef(const String& string, int start = 0, int len = -1)
{
if (len < 0)
len = string.length() - start;
Q_ASSERT(start + len <= string.length());
return QString::fromRawData(reinterpret_cast<const QChar*>(string.characters() + start), len);
}
static QTextLine setupLayout(QTextLayout* layout, const TextRun& style)
{
int flags = style.rtl() ? Qt::TextForceRightToLeft : Qt::TextForceLeftToRight;
if (style.expansion())
flags |= Qt::TextJustificationForced;
layout->setFlags(flags);
layout->beginLayout();
QTextLine line = layout->createLine();
line.setLineWidth(INT_MAX / 256);
if (style.expansion())
line.setLineWidth(line.naturalTextWidth() + style.expansion());
layout->endLayout();
return line;
}
static QPen fillPenForContext(GraphicsContext* ctx)
{
if (ctx->fillGradient()) {
QBrush brush(*ctx->fillGradient()->platformGradient());
brush.setTransform(ctx->fillGradient()->gradientSpaceTransform());
return QPen(brush, 0);
}
if (ctx->fillPattern()) {
AffineTransform affine;
return QPen(QBrush(ctx->fillPattern()->createPlatformPattern(affine)), 0);
}
return QPen(QColor(ctx->fillColor()));
}
static QPen strokePenForContext(GraphicsContext* ctx)
{
if (ctx->strokeGradient()) {
QBrush brush(*ctx->strokeGradient()->platformGradient());
brush.setTransform(ctx->strokeGradient()->gradientSpaceTransform());
return QPen(brush, ctx->strokeThickness());
}
if (ctx->strokePattern()) {
AffineTransform affine;
QBrush brush(ctx->strokePattern()->createPlatformPattern(affine));
return QPen(brush, ctx->strokeThickness());
}
return QPen(QColor(ctx->strokeColor()), ctx->strokeThickness());
}
static void drawTextCommon(GraphicsContext* ctx, const TextRun& run, const FloatPoint& point, int from, int to, const QFont& font, bool isComplexText)
{
if (to < 0)
to = run.length();
QPainter* p = ctx->platformContext();
QPen textFillPen;
if (ctx->textDrawingMode() & TextModeFill)
textFillPen = fillPenForContext(ctx);
QPen textStrokePen;
if (ctx->textDrawingMode() & TextModeStroke)
textStrokePen = strokePenForContext(ctx);
String sanitized = Font::normalizeSpaces(run.characters(), run.length());
QString string = fromRawDataWithoutRef(sanitized);
QPointF pt(point.x(), point.y());
if (from > 0 || to < run.length()) {
if (isComplexText) {
QTextLayout layout(string, font);
QTextLine line = setupLayout(&layout, run);
float x1 = line.cursorToX(from);
float x2 = line.cursorToX(to);
if (x2 < x1)
qSwap(x1, x2);
QFontMetrics fm(font);
int ascent = fm.ascent();
QRectF boundingRect(point.x() + x1, point.y() - ascent, x2 - x1, fm.height());
QRectF clip = boundingRect;
ShadowBlur* ctxShadow = ctx->shadowBlur();
if (ctxShadow->type() != ShadowBlur::NoShadow) {
const QPointF shadowOffset(ctx->state().shadowOffset.width(), ctx->state().shadowOffset.height());
qreal dx1 = 0, dx2 = 0, dy1 = 0, dy2 = 0;
if (shadowOffset.x() > 0)
dx2 = shadowOffset.x();
else
dx1 = -shadowOffset.x();
if (shadowOffset.y() > 0)
dy2 = shadowOffset.y();
else
dy1 = -shadowOffset.y();
const float blurDistance = ctx->state().shadowBlur;
clip.adjust(dx1, dx2, dy1, dy2);
clip.adjust(-blurDistance, -blurDistance, blurDistance, blurDistance);
}
p->save();
p->setClipRect(clip.toRect(), Qt::IntersectClip);
pt.setY(pt.y() - ascent);
if (ctxShadow->type() != ShadowBlur::NoShadow) {
ShadowBlur* ctxShadow = ctx->shadowBlur();
if (ctxShadow->type() != ShadowBlur::BlurShadow
&& (!ctxShadow->shadowsIgnoreTransforms() || ctx->getCTM().isIdentity())) {
p->save();
p->setPen(ctx->state().shadowColor);
p->translate(QPointF(ctx->state().shadowOffset.width(), ctx->state().shadowOffset.height()));
line.draw(p, pt);
p->restore();
} else {
GraphicsContext* shadowContext = ctxShadow->beginShadowLayer(ctx, boundingRect);
if (shadowContext) {
QPainter* shadowPainter = shadowContext->platformContext();
shadowPainter->setFont(p->font());
shadowPainter->setPen(ctx->state().shadowColor);
line.draw(shadowPainter, pt);
ctxShadow->endShadowLayer(ctx);
}
}
}
p->setPen(textFillPen);
line.draw(p, pt);
p->restore();
return;
}
int skipWidth = QFontMetrics(font).width(string, from, Qt::TextBypassShaping);
pt.setX(pt.x() + skipWidth);
string = fromRawDataWithoutRef(sanitized, from, to - from);
}
p->setFont(font);
int flags = run.rtl() ? Qt::TextForceRightToLeft : Qt::TextForceLeftToRight;
if (!isComplexText && !(ctx->textDrawingMode() & TextModeStroke))
flags |= Qt::TextBypassShaping;
QPainterPath textStrokePath;
if (ctx->textDrawingMode() & TextModeStroke)
textStrokePath.addText(pt, font, string);
ShadowBlur* ctxShadow = ctx->shadowBlur();
if (ctx->hasShadow() && ctxShadow->type() != ShadowBlur::NoShadow) {
if (ctx->textDrawingMode() & TextModeFill) {
if (ctxShadow->type() != ShadowBlur::BlurShadow) {
p->save();
p->setPen(ctx->state().shadowColor);
p->translate(QPointF(ctx->state().shadowOffset.width(), ctx->state().shadowOffset.height()));
p->drawText(pt, string, flags, run.expansion());
p->restore();
} else {
QFontMetrics fm(font);
QRectF boundingRect(pt.x(), point.y() - fm.ascent(), fm.width(string, -1, flags), fm.height());
GraphicsContext* shadowContext = ctxShadow->beginShadowLayer(ctx, boundingRect);
if (shadowContext) {
QPainter* shadowPainter = shadowContext->platformContext();
shadowPainter->setFont(p->font());
shadowPainter->setPen(ctx->state().shadowColor);
shadowPainter->drawText(pt, string, flags, run.expansion());
ctxShadow->endShadowLayer(ctx);
}
}
} else if (ctx->textDrawingMode() & TextModeStroke) {
if (ctxShadow->type() != ShadowBlur::BlurShadow) {
const QPointF shadowOffset(ctx->state().shadowOffset.width(), ctx->state().shadowOffset.height());
p->translate(shadowOffset);
p->strokePath(textStrokePath, QPen(ctx->state().shadowColor));
p->translate(-shadowOffset);
} else {
QFontMetrics fm(font);
QRectF boundingRect(pt.x(), point.y() - fm.ascent(), fm.width(string, -1, flags), fm.height());
GraphicsContext* shadowContext = ctxShadow->beginShadowLayer(ctx, boundingRect);
if (shadowContext) {
QPainter* shadowPainter = shadowContext->platformContext();
shadowPainter->setFont(p->font());
shadowPainter->strokePath(textStrokePath, QPen(ctx->state().shadowColor));
ctxShadow->endShadowLayer(ctx);
}
}
}
}
if (ctx->textDrawingMode() & TextModeStroke)
p->strokePath(textStrokePath, textStrokePen);
if (ctx->textDrawingMode() & TextModeFill) {
QPen previousPen = p->pen();
p->setPen(textFillPen);
p->drawText(pt, string, flags, run.expansion());
p->setPen(previousPen);
}
}
void Font::drawComplexText(GraphicsContext* ctx, const TextRun& run, const FloatPoint& point, int from, int to) const
{
drawTextCommon(ctx, run, point, from, to, font(), true);
}
float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>*, GlyphOverflow*) const
{
if (!primaryFont()->platformData().size())
return 0;
if (!run.length())
return 0;
if (run.length() == 1 && treatAsSpace(run[0]))
return QFontMetrics(font()).width(space) + run.expansion();
String sanitized = Font::normalizeSpaces(run.characters(), run.length());
QString string = fromRawDataWithoutRef(sanitized);
int w = QFontMetrics(font()).width(string);
if (treatAsSpace(run[0]))
w -= m_wordSpacing;
return w + run.expansion();
}
int Font::offsetForPositionForComplexText(const TextRun& run, float position, bool) const
{
String sanitized = Font::normalizeSpaces(run.characters(), run.length());
QString string = fromRawDataWithoutRef(sanitized);
QTextLayout layout(string, font());
QTextLine line = setupLayout(&layout, run);
return line.xToCursor(position);
}
FloatRect Font::selectionRectForComplexText(const TextRun& run, const FloatPoint& pt, int h, int from, int to) const
{
String sanitized = Font::normalizeSpaces(run.characters(), run.length());
QString string = fromRawDataWithoutRef(sanitized);
QTextLayout layout(string, font());
QTextLine line = setupLayout(&layout, run);
float x1 = line.cursorToX(from);
float x2 = line.cursorToX(to);
if (x2 < x1)
qSwap(x1, x2);
return FloatRect(pt.x() + x1, pt.y(), x2 - x1, h);
}
bool Font::canReturnFallbackFontsForComplexText()
{
return false;
}
void Font::drawEmphasisMarksForComplexText(GraphicsContext* , const TextRun& , const AtomicString& , const FloatPoint& , int , int ) const
{
notImplemented();
}
void Font::drawSimpleText(GraphicsContext* ctx, const TextRun& run, const FloatPoint& point, int from, int to) const
{
drawTextCommon(ctx, run, point, from, to, font(), false);
}
int Font::offsetForPositionForSimpleText(const TextRun& run, float position, bool includePartialGlyphs) const
{
String sanitized = Font::normalizeSpaces(run.characters(), run.length());
QString string = fromRawDataWithoutRef(sanitized);
QFontMetrics fm(font());
float delta = position;
int curPos = 0;
do {
float charWidth = fm.width(string[curPos]);
delta -= charWidth;
if (includePartialGlyphs) {
if (delta + charWidth / 2 <= 0)
break;
} else {
if (delta + charWidth <= 0)
break;
}
} while (++curPos < string.size());
return curPos;
}
float Font::floatWidthForSimpleText(const TextRun& run, GlyphBuffer* glyphBuffer, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
{
if (!primaryFont()->platformData().size())
return 0;
if (!run.length())
return 0;
String sanitized = Font::normalizeSpaces(run.characters(), run.length());
QString string = fromRawDataWithoutRef(sanitized);
int w = QFontMetrics(font()).width(string, -1, Qt::TextBypassShaping);
if (treatAsSpace(run[0]))
w -= m_wordSpacing;
return w + run.expansion();
}
FloatRect Font::selectionRectForSimpleText(const TextRun& run, const FloatPoint& pt, int h, int from, int to) const
{
String sanitized = Font::normalizeSpaces(run.characters(), run.length());
QString wholeText = fromRawDataWithoutRef(sanitized);
QString selectedText = fromRawDataWithoutRef(sanitized, from, qMin(to - from, wholeText.length() - from));
int startX = QFontMetrics(font()).width(wholeText, from, Qt::TextBypassShaping);
int width = QFontMetrics(font()).width(selectedText, -1, Qt::TextBypassShaping);
return FloatRect(pt.x() + startX, pt.y(), width, h);
}
bool Font::canExpandAroundIdeographsInComplexText()
{
return false;
}
bool Font::primaryFontHasGlyphForCharacter(UChar32) const
{
notImplemented();
return true;
}
int Font::emphasisMarkAscent(const AtomicString&) const
{
notImplemented();
return 0;
}
int Font::emphasisMarkDescent(const AtomicString&) const
{
notImplemented();
return 0;
}
int Font::emphasisMarkHeight(const AtomicString&) const
{
notImplemented();
return 0;
}
void Font::drawEmphasisMarksForSimpleText(GraphicsContext* , const TextRun& , const AtomicString& , const FloatPoint& , int , int ) const
{
notImplemented();
}
QFont Font::font() const
{
QFont f = primaryFont()->getQtFont();
if (m_letterSpacing)
f.setLetterSpacing(QFont::AbsoluteSpacing, m_letterSpacing);
if (m_wordSpacing)
f.setWordSpacing(m_wordSpacing);
return f;
}
QFont Font::syntheticFont() const
{
return font();
}
}