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| 1 /* | |
| 2 * Copyright (c) 2006, 2007, 2008, 2009, 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 #ifndef UniscribeHelperTextRun_h | |
| 32 #define UniscribeHelperTextRun_h | |
| 33 | |
| 34 #include "core/platform/graphics/chromium/UniscribeHelper.h" | |
| 35 #include "wtf/text/WTFString.h" | |
| 36 | |
| 37 namespace WebCore { | |
| 38 | |
| 39 class Font; | |
| 40 class TextRun; | |
| 41 | |
| 42 // Wrapper around the Uniscribe helper that automatically sets it up with the | |
| 43 // WebKit types we supply. | |
| 44 class UniscribeHelperTextRun : public UniscribeHelper { | |
| 45 public: | |
| 46 // Regular constructor used for WebCore text run processing. | |
| 47 UniscribeHelperTextRun(const TextRun&, const Font&); | |
| 48 | |
| 49 // Constructor with the same interface as the gfx::UniscribeState. Using | |
| 50 // this constructor will not give you font fallback, but it will provide | |
| 51 // the ability to load fonts that may not be in the OS cache | |
| 52 // ("TryToPreloadFont") if the caller does not have a TextRun/Font. | |
| 53 UniscribeHelperTextRun(const wchar_t* input, | |
| 54 int inputLength, | |
| 55 bool isRtl, | |
| 56 HFONT hfont, | |
| 57 SCRIPT_CACHE*, | |
| 58 SCRIPT_FONTPROPERTIES*); | |
| 59 | |
| 60 protected: | |
| 61 virtual void tryToPreloadFont(HFONT); | |
| 62 | |
| 63 private: | |
| 64 // This function retrieves the Windows font data (HFONT, etc) for the next | |
| 65 // WebKit font in the list. If the font data corresponding to font_index_ | |
| 66 // has been obtained before, returns the values stored in our internal | |
| 67 // vectors (hfonts_, etc). Otherwise, it gets next SimpleFontData from | |
| 68 // WebKit and adds them to in hfonts_ and friends so that font data can be | |
| 69 // returned quickly next time they're requested. | |
| 70 virtual bool nextWinFontData(HFONT&, SCRIPT_CACHE*&, SCRIPT_FONTPROPERTIES*&
, int& ascent, WORD& spaceGlyph); | |
| 71 virtual void resetFontIndex(); | |
| 72 | |
| 73 // Reference to blink::Font that contains all the information about fonts | |
| 74 // we can use to render this input run of text. It is used in | |
| 75 // NextWinFontData to retrieve Windows font data for a series of | |
| 76 // non-primary fonts. | |
| 77 // | |
| 78 // This pointer can be NULL for no font fallback handling. | |
| 79 const Font* m_font; | |
| 80 | |
| 81 // When we have an 8 bit TestRun, we store the buffer of upconverted charact
ers | |
| 82 // in this string. | |
| 83 String m_stringFor8BitRun; | |
| 84 | |
| 85 // It's rare that many fonts are listed in stylesheets. | |
| 86 // Four would be large enough in most cases. | |
| 87 const static size_t kNumberOfFonts = 4; | |
| 88 | |
| 89 // These vectors are used to store Windows font data for non-primary fonts. | |
| 90 Vector<HFONT, kNumberOfFonts> m_hfonts; | |
| 91 Vector<SCRIPT_CACHE*, kNumberOfFonts> m_scriptCaches; | |
| 92 Vector<SCRIPT_FONTPROPERTIES*, kNumberOfFonts> m_fontProperties; | |
| 93 Vector<int, kNumberOfFonts> m_ascents; | |
| 94 Vector<WORD> m_spaceGlyphs; | |
| 95 | |
| 96 // Index of the fallback font we're currently using for NextWinFontData. | |
| 97 int m_fontIndex; | |
| 98 }; | |
| 99 | |
| 100 } // namespace WebCore | |
| 101 | |
| 102 #endif // UniscribeHelperTextRun_h | |
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