1 /* 2 * Copyright (c) 2006, 2007, 2008, Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 // A collection of utilities for font handling. 32 33 // FIXME: Move all methods to the files that have their callsites and remove this file. 34 // *Utils files are not very WebKit-ty. 35 36 #ifndef FontUtilsWin_h 37 #define FontUtilsWin_h 38 39 #include <usp10.h> 40 #include <wchar.h> 41 #include <windows.h> 42 43 #include "FontDescription.h" 44 #include <unicode/uscript.h> 45 46 namespace WebCore { 47 48 // Return a font family that supports a script and belongs to |generic| font 49 // family. It can return NULL and a caller has to implement its own fallback. 50 const UChar* getFontFamilyForScript(UScriptCode, FontDescription::GenericFamilyType); 51 52 // Return a font family that can render |characters| based on 53 // what script characters belong to. When char_checked is non-NULL, 54 // it's filled with the character used to determine the script. 55 // When script_checked is non-NULL, the script used to determine 56 // the family is returned. 57 // FIXME: This function needs a total overhaul. 58 const UChar* getFallbackFamily(const UChar* characters, int length, 59 FontDescription::GenericFamilyType, 60 UChar32* charChecked, 61 UScriptCode* scriptChecked); 62 63 // Derive a new HFONT by replacing lfFaceName of LOGFONT with |family|, 64 // calculate the ascent for the derived HFONT, and initialize SCRIPT_CACHE 65 // in FontData. 66 // |style| is only used for cache key generation. |style| is 67 // bit-wise OR of BOLD(1), UNDERLINED(2) and ITALIC(4) and 68 // should match what's contained in LOGFONT. It should be calculated 69 // by calling GetStyleFromLogFont. 70 // Returns false if the font is not accessible, in which case |ascent| field 71 // of |fontdata| is set to kUndefinedAscent. 72 // Be aware that this is not thread-safe. 73 // FIXME: Instead of having three out params, we'd better have one 74 // (|*FontData|), but somehow it mysteriously messes up the layout for 75 // certain complex script pages (e.g. hi.wikipedia.org) and also crashes 76 // at the start-up if recently visited page list includes pages with complex 77 // scripts in their title. Moreover, somehow the very first-pass of 78 // intl2 page-cycler test is noticeably slower with one out param than 79 // the current version although the subsequent 9 passes take about the 80 // same time. 81 bool getDerivedFontData(const UChar* family, int style, LOGFONT*, int* ascent, HFONT*, SCRIPT_CACHE**); 82 83 enum { 84 FontStyleNormal = 0, 85 FontStyleBold = 1, 86 FontStyleItalic = 2, 87 FontStyleUnderlined = 4 88 }; 89 90 // Derive style (bit-wise OR of FONT_STYLE_BOLD, FONT_STYLE_UNDERLINED, and 91 // FONT_STYLE_ITALIC) from LOGFONT. Returns 0 if |*logfont| is NULL. 92 int getStyleFromLogfont(const LOGFONT*); 93 94 } // namespace WebCore 95 96 #endif // FontUtilsWin_h 97