RenderCombineText.cpp [plain text]
#include "config.h"
#include "RenderCombineText.h"
#include "TextRun.h"
namespace WebCore {
const float textCombineMargin = 1.1f;
RenderCombineText::RenderCombineText(Node* node, PassRefPtr<StringImpl> string)
: RenderText(node, string)
, m_combinedTextWidth(0)
, m_isCombined(false)
, m_needsFontUpdate(false)
{
}
void RenderCombineText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
setStyleInternal(RenderStyle::clone(style()));
RenderText::styleDidChange(diff, oldStyle);
if (m_isCombined)
RenderText::setTextInternal(originalText());
m_needsFontUpdate = true;
}
void RenderCombineText::setTextInternal(PassRefPtr<StringImpl> text)
{
RenderText::setTextInternal(text);
m_needsFontUpdate = true;
}
float RenderCombineText::width(unsigned from, unsigned length, const Font& font, float xPosition, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
{
if (!characters())
return 0;
if (m_isCombined)
return font.size();
return RenderText::width(from, length, font, xPosition, fallbackFonts, glyphOverflow);
}
void RenderCombineText::adjustTextOrigin(FloatPoint& textOrigin, const FloatRect& boxRect) const
{
if (m_isCombined)
textOrigin.move(boxRect.height() / 2 - ceilf(m_combinedTextWidth) / 2, style()->font().pixelSize());
}
void RenderCombineText::charactersToRender(int start, const UChar*& characters, int& length) const
{
if (m_isCombined) {
length = originalText()->length();
characters = originalText()->characters();
return;
}
characters = text()->characters() + start;
}
void RenderCombineText::combineText()
{
if (!m_needsFontUpdate)
return;
m_isCombined = false;
m_needsFontUpdate = false;
if (style()->isHorizontalWritingMode())
return;
TextRun run = TextRun(String(text()));
FontDescription description = originalFont().fontDescription();
float emWidth = description.computedSize() * textCombineMargin;
bool shouldUpdateFont = false;
description.setOrientation(Horizontal); m_combinedTextWidth = originalFont().width(run);
m_isCombined = m_combinedTextWidth <= emWidth;
if (m_isCombined)
shouldUpdateFont = style()->setFontDescription(description); else {
static const FontWidthVariant widthVariants[] = { HalfWidth, ThirdWidth, QuarterWidth };
for (size_t i = 0 ; i < WTF_ARRAY_LENGTH(widthVariants) ; ++i) {
description.setWidthVariant(widthVariants[i]);
Font compressedFont = Font(description, style()->font().letterSpacing(), style()->font().wordSpacing());
compressedFont.update(style()->font().fontSelector());
float runWidth = compressedFont.width(run);
if (runWidth <= emWidth) {
m_combinedTextWidth = runWidth;
m_isCombined = true;
shouldUpdateFont = style()->setFontDescription(description);
break;
}
}
}
if (!m_isCombined)
shouldUpdateFont = style()->setFontDescription(originalFont().fontDescription());
if (shouldUpdateFont)
style()->font().update(style()->font().fontSelector());
if (m_isCombined) {
DEFINE_STATIC_LOCAL(String, objectReplacementCharacterString, (&objectReplacementCharacter, 1));
RenderText::setTextInternal(objectReplacementCharacterString.impl());
}
}
}