/* * Copyright (C) 2006, 2007 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Apple Inc. ("Apple") nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "GlyphPage.h" #include "CoreGraphicsSPI.h" #include "CoreTextSPI.h" #include "Font.h" #include "FontCascade.h" #include "WebCoreSystemInterface.h" #if !PLATFORM(IOS) #include <ApplicationServices/ApplicationServices.h> #endif namespace WebCore { static bool shouldUseCoreText(const UChar* buffer, unsigned bufferLength, const Font& fontData) { // This needs to be kept in sync with GlyphPage::fill(). Currently, the CoreText paths are not able to handle // every situtation. Returning true from this function in a new situation will require you to explicitly add // handling for that situation in the CoreText paths of GlyphPage::fill(). if (fontData.platformData().isSystemFont()) return true; if (fontData.platformData().isForTextCombine() || fontData.hasVerticalGlyphs()) { // Ideographs don't have a vertical variant or width variants. for (unsigned i = 0; i < bufferLength; ++i) { if (!FontCascade::isCJKIdeograph(buffer[i])) return true; } } return false; } bool GlyphPage::fill(UChar* buffer, unsigned bufferLength) { ASSERT(bufferLength == GlyphPage::size || bufferLength == 2 * GlyphPage::size); const Font& font = this->font(); Vector<CGGlyph, 512> glyphs(bufferLength); unsigned glyphStep; if (!shouldUseCoreText(buffer, bufferLength, font)) { // We pass in either 256 or 512 UTF-16 characters: 256 for U+FFFF and less, 512 (double character surrogates) // for U+10000 and above. It is indeed possible to get back 512 glyphs back from the API, so the glyph buffer // we pass in must be 512. If we get back more than 256 glyphs though we'll ignore all the ones after 256, // this should not happen as the only time we pass in 512 characters is when they are surrogates. CGFontGetGlyphsForUnichars(font.platformData().cgFont(), buffer, glyphs.data(), bufferLength); glyphStep = 1; } else { // Because we know the implementation of shouldUseCoreText(), if the font isn't for text combine and it isn't a system font, // we know it must have vertical glyphs. if (font.platformData().isForTextCombine() || font.platformData().isSystemFont()) CTFontGetGlyphsForCharacters(font.platformData().ctFont(), buffer, glyphs.data(), bufferLength); else CTFontGetVerticalGlyphsForCharacters(font.platformData().ctFont(), buffer, glyphs.data(), bufferLength); // When buffer consists of surrogate pairs, CTFontGetVerticalGlyphsForCharacters and CTFontGetGlyphsForCharacters // place the glyphs at indices corresponding to the first character of each pair. glyphStep = bufferLength / GlyphPage::size; } bool haveGlyphs = false; for (unsigned i = 0; i < GlyphPage::size; ++i) { if (glyphs[i * glyphStep]) { setGlyphForIndex(i, glyphs[i * glyphStep]); haveGlyphs = true; } } return haveGlyphs; } } // namespace WebCore