| /** |
| * This file is part of the html renderer for KDE. |
| * |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2003, 2006 Apple Computer, Inc. |
| * |
| * 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., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| * |
| */ |
| |
| #include "config.h" |
| #include "Font.h" |
| |
| #include "CharacterNames.h" |
| #include "FloatRect.h" |
| #include "FontCache.h" |
| #include "FontFallbackList.h" |
| #include "IntPoint.h" |
| #include "GlyphBuffer.h" |
| #include "TextStyle.h" |
| #include <wtf/unicode/Unicode.h> |
| #include <wtf/MathExtras.h> |
| |
| #if USE(ICU_UNICODE) |
| #include <unicode/unorm.h> |
| #endif |
| |
| using namespace WTF; |
| using namespace Unicode; |
| |
| namespace WebCore { |
| |
| // According to http://www.unicode.org/Public/UNIDATA/UCD.html#Canonical_Combining_Class_Values |
| const uint8_t hiraganaKatakanaVoicingMarksCombiningClass = 8; |
| |
| const uint8_t Font::gRoundingHackCharacterTable[256] = { |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 /*\t*/, 1 /*\n*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1 /*space*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 /*-*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 /*?*/, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1 /*no-break space*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
| }; |
| |
| Font::CodePath Font::codePath = Auto; |
| |
| struct WidthIterator { |
| WidthIterator(const Font* font, const TextRun& run, const TextStyle& style); |
| |
| void advance(int to, GlyphBuffer* glyphBuffer = 0); |
| bool advanceOneCharacter(float& width, GlyphBuffer* glyphBuffer = 0); |
| |
| const Font* m_font; |
| |
| const TextRun& m_run; |
| int m_end; |
| |
| const TextStyle& m_style; |
| |
| unsigned m_currentCharacter; |
| float m_runWidthSoFar; |
| float m_padding; |
| float m_padPerSpace; |
| float m_finalRoundingWidth; |
| |
| private: |
| UChar32 normalizeVoicingMarks(int currentCharacter); |
| }; |
| |
| WidthIterator::WidthIterator(const Font* font, const TextRun& run, const TextStyle& style) |
| : m_font(font) |
| , m_run(run) |
| , m_end(run.length()) |
| , m_style(style) |
| , m_currentCharacter(0) |
| , m_runWidthSoFar(0) |
| , m_finalRoundingWidth(0) |
| { |
| // If the padding is non-zero, count the number of spaces in the run |
| // and divide that by the padding for per space addition. |
| m_padding = m_style.padding(); |
| if (!m_padding) |
| m_padPerSpace = 0; |
| else { |
| float numSpaces = 0; |
| for (int i = 0; i < run.length(); i++) |
| if (Font::treatAsSpace(m_run[i])) |
| numSpaces++; |
| |
| if (numSpaces == 0) |
| m_padPerSpace = 0; |
| else |
| m_padPerSpace = ceilf(m_style.padding() / numSpaces); |
| } |
| } |
| |
| void WidthIterator::advance(int offset, GlyphBuffer* glyphBuffer) |
| { |
| if (offset > m_end) |
| offset = m_end; |
| |
| int currentCharacter = m_currentCharacter; |
| const UChar* cp = m_run.data(currentCharacter); |
| |
| bool rtl = m_style.rtl(); |
| bool attemptFontSubstitution = m_style.attemptFontSubstitution(); |
| bool hasExtraSpacing = m_font->letterSpacing() || m_font->wordSpacing() || m_padding; |
| |
| float runWidthSoFar = m_runWidthSoFar; |
| float lastRoundingWidth = m_finalRoundingWidth; |
| |
| while (currentCharacter < offset) { |
| UChar32 c = *cp; |
| unsigned clusterLength = 1; |
| if (c >= 0x3041) { |
| if (c <= 0x30FE) { |
| // Deal with Hiragana and Katakana voiced and semi-voiced syllables. |
| // Normalize into composed form, and then look for glyph with base + combined mark. |
| // Check above for character range to minimize performance impact. |
| UChar32 normalized = normalizeVoicingMarks(currentCharacter); |
| if (normalized) { |
| c = normalized; |
| clusterLength = 2; |
| } |
| } else if (U16_IS_SURROGATE(c)) { |
| if (!U16_IS_SURROGATE_LEAD(c)) |
| break; |
| |
| // Do we have a surrogate pair? If so, determine the full Unicode (32 bit) |
| // code point before glyph lookup. |
| // Make sure we have another character and it's a low surrogate. |
| if (currentCharacter + 1 >= m_run.length()) |
| break; |
| UChar low = cp[1]; |
| if (!U16_IS_TRAIL(low)) |
| break; |
| c = U16_GET_SUPPLEMENTARY(c, low); |
| clusterLength = 2; |
| } |
| } |
| |
| const GlyphData& glyphData = m_font->glyphDataForCharacter(c, cp, clusterLength, rtl, attemptFontSubstitution); |
| Glyph glyph = glyphData.glyph; |
| const FontData* fontData = glyphData.fontData; |
| |
| ASSERT(fontData); |
| |
| // Now that we have a glyph and font data, get its width. |
| float width; |
| if (c == '\t' && m_style.allowTabs()) { |
| float tabWidth = m_font->tabWidth(); |
| width = tabWidth - fmodf(m_style.xPos() + runWidthSoFar, tabWidth); |
| } else { |
| width = fontData->widthForGlyph(glyph); |
| // We special case spaces in two ways when applying word rounding. |
| // First, we round spaces to an adjusted width in all fonts. |
| // Second, in fixed-pitch fonts we ensure that all characters that |
| // match the width of the space character have the same width as the space character. |
| if (width == fontData->m_spaceWidth && (fontData->m_treatAsFixedPitch || glyph == fontData->m_spaceGlyph) && m_style.applyWordRounding()) |
| width = fontData->m_adjustedSpaceWidth; |
| } |
| |
| if (hasExtraSpacing) { |
| // Account for letter-spacing. |
| if (width && m_font->letterSpacing()) |
| width += m_font->letterSpacing(); |
| |
| if (Font::treatAsSpace(c)) { |
| // Account for padding. WebCore uses space padding to justify text. |
| // We distribute the specified padding over the available spaces in the run. |
| if (m_padding) { |
| // Use left over padding if not evenly divisible by number of spaces. |
| if (m_padding < m_padPerSpace) { |
| width += m_padding; |
| m_padding = 0; |
| } else { |
| width += m_padPerSpace; |
| m_padding -= m_padPerSpace; |
| } |
| } |
| |
| // Account for word spacing. |
| // We apply additional space between "words" by adding width to the space character. |
| if (currentCharacter != 0 && !Font::treatAsSpace(cp[-1]) && m_font->wordSpacing()) |
| width += m_font->wordSpacing(); |
| } |
| } |
| |
| // Advance past the character we just dealt with. |
| cp += clusterLength; |
| currentCharacter += clusterLength; |
| |
| // Account for float/integer impedance mismatch between CG and KHTML. "Words" (characters |
| // followed by a character defined by isRoundingHackCharacter()) are always an integer width. |
| // We adjust the width of the last character of a "word" to ensure an integer width. |
| // If we move KHTML to floats we can remove this (and related) hacks. |
| |
| float oldWidth = width; |
| |
| // Force characters that are used to determine word boundaries for the rounding hack |
| // to be integer width, so following words will start on an integer boundary. |
| if (m_style.applyWordRounding() && Font::isRoundingHackCharacter(c)) |
| width = ceilf(width); |
| |
| // Check to see if the next character is a "rounding hack character", if so, adjust |
| // width so that the total run width will be on an integer boundary. |
| if ((m_style.applyWordRounding() && currentCharacter < m_run.length() && Font::isRoundingHackCharacter(*cp)) |
| || (m_style.applyRunRounding() && currentCharacter >= m_end)) { |
| float totalWidth = runWidthSoFar + width; |
| width += ceilf(totalWidth) - totalWidth; |
| } |
| |
| runWidthSoFar += width; |
| |
| if (glyphBuffer) |
| glyphBuffer->add(glyph, fontData, (rtl ? oldWidth + lastRoundingWidth : width)); |
| |
| lastRoundingWidth = width - oldWidth; |
| } |
| |
| m_currentCharacter = currentCharacter; |
| m_runWidthSoFar = runWidthSoFar; |
| m_finalRoundingWidth = lastRoundingWidth; |
| } |
| |
| bool WidthIterator::advanceOneCharacter(float& width, GlyphBuffer* glyphBuffer) |
| { |
| glyphBuffer->clear(); |
| advance(m_currentCharacter + 1, glyphBuffer); |
| float w = 0; |
| for (int i = 0; i < glyphBuffer->size(); ++i) |
| w += glyphBuffer->advanceAt(i); |
| width = w; |
| return !glyphBuffer->isEmpty(); |
| } |
| |
| UChar32 WidthIterator::normalizeVoicingMarks(int currentCharacter) |
| { |
| if (currentCharacter + 1 < m_end) { |
| if (combiningClass(m_run[currentCharacter + 1]) == hiraganaKatakanaVoicingMarksCombiningClass) { |
| #if USE(ICU_UNICODE) |
| // Normalize into composed form using 3.2 rules. |
| UChar normalizedCharacters[2] = { 0, 0 }; |
| UErrorCode uStatus = U_ZERO_ERROR; |
| int32_t resultLength = unorm_normalize(m_run.data(currentCharacter), 2, |
| UNORM_NFC, UNORM_UNICODE_3_2, &normalizedCharacters[0], 2, &uStatus); |
| if (resultLength == 1 && uStatus == 0) |
| return normalizedCharacters[0]; |
| #elif USE(QT4_UNICODE) |
| QString tmp(reinterpret_cast<const QChar*>(m_run.data(currentCharacter)), 2); |
| QString res = tmp.normalized(QString::NormalizationForm_C, QChar::Unicode_3_2); |
| if (res.length() == 1) |
| return res.at(0).unicode(); |
| #endif |
| } |
| } |
| return 0; |
| } |
| |
| // ============================================================================================ |
| // Font Implementation (Cross-Platform Portion) |
| // ============================================================================================ |
| |
| Font::Font() |
| : m_pageZero(0) |
| , m_letterSpacing(0) |
| , m_wordSpacing(0) |
| , m_isPlatformFont(false) |
| { |
| } |
| |
| Font::Font(const FontDescription& fd, short letterSpacing, short wordSpacing) |
| : m_fontDescription(fd) |
| , m_pageZero(0) |
| , m_letterSpacing(letterSpacing) |
| , m_wordSpacing(wordSpacing) |
| , m_isPlatformFont(false) |
| { |
| } |
| |
| Font::Font(const FontPlatformData& fontData, bool isPrinterFont) |
| : m_fontList(new FontFallbackList) |
| , m_pageZero(0) |
| , m_letterSpacing(0) |
| , m_wordSpacing(0) |
| , m_isPlatformFont(true) |
| { |
| m_fontDescription.setUsePrinterFont(isPrinterFont); |
| m_fontList->setPlatformFont(fontData); |
| } |
| |
| Font::Font(const Font& other) |
| : m_fontDescription(other.m_fontDescription) |
| , m_fontList(other.m_fontList) |
| , m_pages(other.m_pages) |
| , m_pageZero(other.m_pageZero) |
| , m_letterSpacing(other.m_letterSpacing) |
| , m_wordSpacing(other.m_wordSpacing) |
| , m_isPlatformFont(other.m_isPlatformFont) |
| { |
| } |
| |
| Font& Font::operator=(const Font& other) |
| { |
| m_fontDescription = other.m_fontDescription; |
| m_fontList = other.m_fontList; |
| m_pages = other.m_pages; |
| m_pageZero = other.m_pageZero; |
| m_letterSpacing = other.m_letterSpacing; |
| m_wordSpacing = other.m_wordSpacing; |
| m_isPlatformFont = other.m_isPlatformFont; |
| return *this; |
| } |
| |
| Font::~Font() |
| { |
| } |
| |
| // FIXME: It is unfortunate that this function needs to be passed the original cluster. |
| // It is only required for the platform's FontCache::getFontDataForCharacters(), and it means |
| // that this function is not correct if it transforms the character to uppercase and calls |
| // FontCache::getFontDataForCharacters() afterwards. |
| const GlyphData& Font::glyphDataForCharacter(UChar32 c, const UChar* cluster, unsigned clusterLength, bool mirror, bool attemptFontSubstitution) const |
| { |
| bool smallCaps = false; |
| |
| if (m_fontDescription.smallCaps() && !Unicode::isUpper(c)) { |
| // Convert lowercase to upper. |
| UChar32 upperC = Unicode::toUpper(c); |
| if (upperC != c) { |
| c = upperC; |
| smallCaps = true; |
| } |
| } |
| |
| if (mirror) |
| c = mirroredChar(c); |
| |
| unsigned pageNumber = (c / GlyphPage::size); |
| |
| GlyphPageTreeNode* node = pageNumber ? m_pages.get(pageNumber) : m_pageZero; |
| if (!node) { |
| node = GlyphPageTreeNode::getRootChild(primaryFont(), pageNumber); |
| if (pageNumber) |
| m_pages.set(pageNumber, node); |
| else |
| m_pageZero = node; |
| } |
| |
| if (!attemptFontSubstitution && node->level() != 1) |
| node = GlyphPageTreeNode::getRootChild(primaryFont(), pageNumber); |
| |
| while (true) { |
| GlyphPage* page = node->page(); |
| |
| if (page) { |
| const GlyphData& data = page->glyphDataForCharacter(c); |
| if (data.glyph || !attemptFontSubstitution) { |
| if (!smallCaps) |
| return data; // We have a glyph for the character in question in the current page (or we've been told not to fall back). |
| |
| const FontData* smallCapsFontData = data.fontData->smallCapsFontData(m_fontDescription); |
| |
| if (!smallCapsFontData) |
| // This should not happen, but if it does, we will return a big cap. |
| return data; |
| |
| GlyphPageTreeNode* smallCapsNode = GlyphPageTreeNode::getRootChild(smallCapsFontData, pageNumber); |
| GlyphPage* smallCapsPage = smallCapsNode->page(); |
| |
| if (smallCapsPage) { |
| const GlyphData& data = smallCapsPage->glyphDataForCharacter(c); |
| if (data.glyph || !attemptFontSubstitution) |
| return data; |
| } |
| // Not attempting system fallback off the smallCapsFontData. This is the very unlikely case that |
| // a font has the lowercase character but not its uppercase version. |
| return smallCapsFontData->missingGlyphData(); |
| } |
| } else if (!attemptFontSubstitution) { |
| if (smallCaps) { |
| if (const FontData* smallCapsFontData = primaryFont()->smallCapsFontData(m_fontDescription)) |
| return smallCapsFontData->missingGlyphData(); |
| } |
| return primaryFont()->missingGlyphData(); |
| } |
| |
| if (node->isSystemFallback()) { |
| // System fallback is character-dependent. When we get here, we |
| // know that the character in question isn't in the system fallback |
| // font's glyph page. Try to lazily create it here. |
| |
| // Convert characters that shouldn't render to zero width spaces when asking what font is |
| // appropriate. |
| const FontData* characterFontData; |
| if (clusterLength == 1 && Font::treatAsZeroWidthSpace(cluster[0])) |
| characterFontData = FontCache::getFontDataForCharacters(*this, &zeroWidthSpace, 1); |
| else |
| characterFontData = FontCache::getFontDataForCharacters(*this, cluster, clusterLength); |
| if (smallCaps) |
| characterFontData = characterFontData->smallCapsFontData(m_fontDescription); |
| if (characterFontData) { |
| // Got the fallback font, return the glyph page associated with |
| // it. We also store the FontData for the glyph in the fallback |
| // page for future use (it's lazily populated by us). |
| GlyphPage* fallbackPage = GlyphPageTreeNode::getRootChild(characterFontData, pageNumber)->page(); |
| const GlyphData& data = fallbackPage ? fallbackPage->glyphDataForCharacter(c) : characterFontData->missingGlyphData(); |
| if (!smallCaps) |
| page->setGlyphDataForCharacter(c, data.glyph, characterFontData); |
| return data; |
| } |
| // Even system fallback can fail. |
| // FIXME: Should the last resort font be used? |
| const GlyphData& data = primaryFont()->missingGlyphData(); |
| if (!smallCaps && page) |
| page->setGlyphDataForCharacter(c, data.glyph, data.fontData); |
| return data; |
| } |
| |
| // Proceed with the fallback list. |
| const FontData* fontData = fontDataAt(node->level()); |
| node = node->getChild(fontData, pageNumber); |
| |
| if (pageNumber) |
| m_pages.set(pageNumber, node); |
| else |
| m_pageZero = node; |
| } |
| } |
| |
| const FontData* Font::primaryFont() const |
| { |
| ASSERT(m_fontList); |
| return m_fontList->primaryFont(this); |
| } |
| |
| const FontData* Font::fontDataAt(unsigned index) const |
| { |
| ASSERT(m_fontList); |
| return m_fontList->fontDataAt(this, index); |
| } |
| |
| const FontData* Font::fontDataForCharacters(const UChar* characters, int length) const |
| { |
| ASSERT(m_fontList); |
| return m_fontList->fontDataForCharacters(this, characters, length); |
| } |
| |
| void Font::update() const |
| { |
| // FIXME: It is pretty crazy that we are willing to just poke into a RefPtr, but it ends up |
| // being reasonably safe (because inherited fonts in the render tree pick up the new |
| // style anyway. Other copies are transient, e.g., the state in the GraphicsContext, and |
| // won't stick around long enough to get you in trouble). Still, this is pretty disgusting, |
| // and could eventually be rectified by using RefPtrs for Fonts themselves. |
| if (!m_fontList) |
| m_fontList = new FontFallbackList; |
| m_fontList->invalidate(); |
| m_pageZero = 0; |
| m_pages.clear(); |
| } |
| |
| int Font::width(const TextRun& run) const |
| { |
| return width(run, TextStyle()); |
| } |
| |
| int Font::width(const TextRun& run, const TextStyle& style) const |
| { |
| return lroundf(floatWidth(run, style)); |
| } |
| |
| int Font::ascent() const |
| { |
| return primaryFont()->ascent(); |
| } |
| |
| int Font::descent() const |
| { |
| return primaryFont()->descent(); |
| } |
| |
| int Font::lineSpacing() const |
| { |
| return primaryFont()->lineSpacing(); |
| } |
| |
| float Font::xHeight() const |
| { |
| return primaryFont()->xHeight(); |
| } |
| |
| int Font::spaceWidth() const |
| { |
| return (int)ceilf(primaryFont()->m_adjustedSpaceWidth + m_letterSpacing); |
| } |
| |
| bool Font::isFixedPitch() const |
| { |
| ASSERT(m_fontList); |
| return m_fontList->isFixedPitch(this); |
| } |
| |
| void Font::setCodePath(CodePath p) |
| { |
| codePath = p; |
| } |
| |
| bool Font::canUseGlyphCache(const TextRun& run) const |
| { |
| switch (codePath) { |
| case Auto: |
| break; |
| case Simple: |
| return true; |
| case Complex: |
| return false; |
| } |
| |
| // Start from 0 since drawing and highlighting also measure the characters before run->from |
| for (int i = 0; i < run.length(); i++) { |
| const UChar c = run[i]; |
| if (c < 0x300) // U+0300 through U+036F Combining diacritical marks |
| continue; |
| if (c <= 0x36F) |
| return false; |
| |
| if (c < 0x0591 || c == 0x05BE) // U+0591 through U+05CF excluding U+05BE Hebrew combining marks, Hebrew punctuation Paseq, Sof Pasuq and Nun Hafukha |
| continue; |
| if (c <= 0x05CF) |
| return false; |
| |
| if (c < 0x0600) // U+0600 through U+1059 Arabic, Syriac, Thaana, Devanagari, Bengali, Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada, Malayalam, Sinhala, Thai, Lao, Tibetan, Myanmar |
| continue; |
| if (c <= 0x1059) |
| return false; |
| |
| if (c < 0x1100) // U+1100 through U+11FF Hangul Jamo (only Ancient Korean should be left here if you precompose; Modern Korean will be precomposed as a result of step A) |
| continue; |
| if (c <= 0x11FF) |
| return false; |
| |
| if (c < 0x1780) // U+1780 through U+18AF Khmer, Mongolian |
| continue; |
| if (c <= 0x18AF) |
| return false; |
| |
| if (c < 0x1900) // U+1900 through U+194F Limbu (Unicode 4.0) |
| continue; |
| if (c <= 0x194F) |
| return false; |
| |
| if (c < 0x20D0) // U+20D0 through U+20FF Combining marks for symbols |
| continue; |
| if (c <= 0x20FF) |
| return false; |
| |
| if (c < 0xFE20) // U+FE20 through U+FE2F Combining half marks |
| continue; |
| if (c <= 0xFE2F) |
| return false; |
| } |
| |
| return true; |
| |
| } |
| |
| void Font::drawSimpleText(GraphicsContext* context, const TextRun& run, const TextStyle& style, const FloatPoint& point, int from, int to) const |
| { |
| // This glyph buffer holds our glyphs+advances+font data for each glyph. |
| GlyphBuffer glyphBuffer; |
| |
| float startX = point.x(); |
| WidthIterator it(this, run, style); |
| it.advance(from); |
| float beforeWidth = it.m_runWidthSoFar; |
| it.advance(to, &glyphBuffer); |
| |
| // We couldn't generate any glyphs for the run. Give up. |
| if (glyphBuffer.isEmpty()) |
| return; |
| |
| float afterWidth = it.m_runWidthSoFar; |
| |
| if (style.rtl()) { |
| float finalRoundingWidth = it.m_finalRoundingWidth; |
| it.advance(run.length()); |
| startX += finalRoundingWidth + it.m_runWidthSoFar - afterWidth; |
| } else |
| startX += beforeWidth; |
| |
| // Swap the order of the glyphs if right-to-left. |
| if (style.rtl()) |
| for (int i = 0, end = glyphBuffer.size() - 1; i < glyphBuffer.size() / 2; ++i, --end) |
| glyphBuffer.swap(i, end); |
| |
| // Calculate the starting point of the glyphs to be displayed by adding |
| // all the advances up to the first glyph. |
| FloatPoint startPoint(startX, point.y()); |
| drawGlyphBuffer(context, glyphBuffer, run, style, startPoint); |
| } |
| |
| void Font::drawGlyphBuffer(GraphicsContext* context, const GlyphBuffer& glyphBuffer, |
| const TextRun& run, const TextStyle& style, const FloatPoint& point) const |
| { |
| // Draw each contiguous run of glyphs that use the same font data. |
| const FontData* fontData = glyphBuffer.fontDataAt(0); |
| FloatSize offset = glyphBuffer.offsetAt(0); |
| FloatPoint startPoint(point); |
| float nextX = startPoint.x(); |
| int lastFrom = 0; |
| int nextGlyph = 0; |
| while (nextGlyph < glyphBuffer.size()) { |
| const FontData* nextFontData = glyphBuffer.fontDataAt(nextGlyph); |
| FloatSize nextOffset = glyphBuffer.offsetAt(nextGlyph); |
| if (nextFontData != fontData || nextOffset != offset) { |
| drawGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint); |
| lastFrom = nextGlyph; |
| fontData = nextFontData; |
| offset = nextOffset; |
| startPoint.setX(nextX); |
| } |
| nextX += glyphBuffer.advanceAt(nextGlyph); |
| nextGlyph++; |
| } |
| drawGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint); |
| } |
| |
| void Font::drawText(GraphicsContext* context, const TextRun& run, const TextStyle& style, const FloatPoint& point, int from, int to) const |
| { |
| to = (to == -1 ? run.length() : to); |
| if (canUseGlyphCache(run)) |
| drawSimpleText(context, run, style, point, from, to); |
| else |
| drawComplexText(context, run, style, point, from, to); |
| } |
| |
| float Font::floatWidth(const TextRun& run, const TextStyle& style) const |
| { |
| if (canUseGlyphCache(run)) |
| return floatWidthForSimpleText(run, style, 0); |
| return floatWidthForComplexText(run, style); |
| } |
| |
| float Font::floatWidthForSimpleText(const TextRun& run, const TextStyle& style, GlyphBuffer* glyphBuffer) const |
| { |
| WidthIterator it(this, run, style); |
| it.advance(run.length(), glyphBuffer); |
| return it.m_runWidthSoFar; |
| } |
| |
| FloatRect Font::selectionRectForText(const TextRun& run, const TextStyle& style, const IntPoint& point, int h, int from, int to) const |
| { |
| to = (to == -1 ? run.length() : to); |
| if (canUseGlyphCache(run)) |
| return selectionRectForSimpleText(run, style, point, h, from, to); |
| return selectionRectForComplexText(run, style, point, h, from, to); |
| } |
| |
| FloatRect Font::selectionRectForSimpleText(const TextRun& run, const TextStyle& style, const IntPoint& point, int h, int from, int to) const |
| { |
| WidthIterator it(this, run, style); |
| it.advance(from); |
| float beforeWidth = it.m_runWidthSoFar; |
| it.advance(to); |
| float afterWidth = it.m_runWidthSoFar; |
| |
| // Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning |
| if (style.rtl()) { |
| it.advance(run.length()); |
| float totalWidth = it.m_runWidthSoFar; |
| return FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(), roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h); |
| } else { |
| return FloatRect(point.x() + floorf(beforeWidth), point.y(), roundf(afterWidth) - floorf(beforeWidth), h); |
| } |
| } |
| |
| int Font::offsetForPosition(const TextRun& run, const TextStyle& style, int x, bool includePartialGlyphs) const |
| { |
| if (canUseGlyphCache(run)) |
| return offsetForPositionForSimpleText(run, style, x, includePartialGlyphs); |
| return offsetForPositionForComplexText(run, style, x, includePartialGlyphs); |
| } |
| |
| int Font::offsetForPositionForSimpleText(const TextRun& run, const TextStyle& style, int x, bool includePartialGlyphs) const |
| { |
| float delta = (float)x; |
| |
| WidthIterator it(this, run, style); |
| GlyphBuffer localGlyphBuffer; |
| unsigned offset; |
| if (style.rtl()) { |
| delta -= floatWidthForSimpleText(run, style, 0); |
| while (1) { |
| offset = it.m_currentCharacter; |
| float w; |
| if (!it.advanceOneCharacter(w, &localGlyphBuffer)) |
| break; |
| delta += w; |
| if (includePartialGlyphs) { |
| if (delta - w / 2 >= 0) |
| break; |
| } else { |
| if (delta >= 0) |
| break; |
| } |
| } |
| } else { |
| while (1) { |
| offset = it.m_currentCharacter; |
| float w; |
| if (!it.advanceOneCharacter(w, &localGlyphBuffer)) |
| break; |
| delta -= w; |
| if (includePartialGlyphs) { |
| if (delta + w / 2 <= 0) |
| break; |
| } else { |
| if (delta <= 0) |
| break; |
| } |
| } |
| } |
| |
| return offset; |
| } |
| |
| } |
