2 * Copyright (C) 2011 Apple Inc. All rights reserved.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
22 #include "core/rendering/RenderCombineText.h"
24 #include "core/rendering/RenderBlockFlow.h"
28 const float textCombineMargin = 1.1f; // Allow em + 10% margin
30 RenderCombineText::RenderCombineText(Node* node, PassRefPtr<StringImpl> string)
31 : RenderText(node, string)
32 , m_combinedTextWidth(0)
34 , m_needsFontUpdate(false)
38 void RenderCombineText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
40 setStyleInternal(RenderStyle::clone(style()));
41 RenderText::styleDidChange(diff, oldStyle);
44 RenderText::setTextInternal(originalText()); // This RenderCombineText has been combined once. Restore the original text for the next combineText().
48 m_needsFontUpdate = true;
51 void RenderCombineText::setTextInternal(PassRefPtr<StringImpl> text)
53 RenderText::setTextInternal(text);
55 m_needsFontUpdate = true;
58 float RenderCombineText::width(unsigned from, unsigned length, const Font& font, float xPosition, TextDirection direction, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
64 return font.fontDescription().computedSize();
66 return RenderText::width(from, length, font, xPosition, direction, fallbackFonts, glyphOverflow);
69 void RenderCombineText::adjustTextOrigin(FloatPoint& textOrigin, const FloatRect& boxRect) const
72 textOrigin.move(boxRect.height() / 2 - ceilf(m_combinedTextWidth) / 2, style()->font().fontDescription().computedPixelSize());
75 void RenderCombineText::getStringToRender(int start, StringView& string, int& length) const
79 string = StringView(m_renderingText.impl());
80 length = string.length();
84 string = text().createView(start, length);
87 void RenderCombineText::combineText()
89 if (!m_needsFontUpdate)
93 m_needsFontUpdate = false;
95 // CSS3 spec says text-combine works only in vertical writing mode.
96 if (style()->isHorizontalWritingMode())
99 TextRun run = RenderBlockFlow::constructTextRun(this, originalFont(), this, style(), style()->direction());
100 FontDescription description = originalFont().fontDescription();
101 float emWidth = description.computedSize() * textCombineMargin;
102 bool shouldUpdateFont = false;
104 description.setOrientation(Horizontal); // We are going to draw combined text horizontally.
105 m_combinedTextWidth = originalFont().width(run);
106 m_isCombined = m_combinedTextWidth <= emWidth;
108 FontSelector* fontSelector = style()->font().fontSelector();
111 shouldUpdateFont = style()->setFontDescription(description); // Need to change font orientation to horizontal.
113 // Need to try compressed glyphs.
114 static const FontWidthVariant widthVariants[] = { HalfWidth, ThirdWidth, QuarterWidth };
115 for (size_t i = 0 ; i < WTF_ARRAY_LENGTH(widthVariants) ; ++i) {
116 description.setWidthVariant(widthVariants[i]);
117 Font compressedFont = Font(description);
118 compressedFont.update(fontSelector);
119 float runWidth = compressedFont.width(run);
120 if (runWidth <= emWidth) {
121 m_combinedTextWidth = runWidth;
124 // Replace my font with the new one.
125 shouldUpdateFont = style()->setFontDescription(description);
132 shouldUpdateFont = style()->setFontDescription(originalFont().fontDescription());
134 if (shouldUpdateFont)
135 style()->font().update(fontSelector);
138 DEFINE_STATIC_LOCAL(String, objectReplacementCharacterString, (&objectReplacementCharacter, 1));
139 m_renderingText = text();
140 RenderText::setTextInternal(objectReplacementCharacterString.impl());
144 } // namespace WebCore